dhd_sdio.c

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/*
 * Copyright (c) 2010 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/printk.h>
#include <linux/pci_ids.h>
#include <linux/netdevice.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/card.h>
#include <linux/semaphore.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/bcma/bcma.h>
#include <linux/debugfs.h>
#include <linux/vmalloc.h>
#include <asm/unaligned.h>
#include <defs.h>
#include <brcmu_wifi.h>
#include <brcmu_utils.h>
#include <brcm_hw_ids.h>
#include <soc.h>
#include "sdio_host.h"
#include "sdio_chip.h"

#define DCMD_RESP_TIMEOUT  2000 /* In milli second */

#ifdef DEBUG

#define BRCMF_TRAP_INFO_SIZE    80

#define CBUF_LEN    (128)

/* Device console log buffer state */
#define CONSOLE_BUFFER_MAX  2024

struct rte_log_le {
    __le32 buf;     /* Can't be pointer on (64-bit) hosts */
    __le32 buf_size;
    __le32 idx;
    char *_buf_compat;  /* Redundant pointer for backward compat. */
};

struct rte_console {
    /* Virtual UART
     * When there is no UART (e.g. Quickturn),
     * the host should write a complete
     * input line directly into cbuf and then write
     * the length into vcons_in.
     * This may also be used when there is a real UART
     * (at risk of conflicting with
     * the real UART).  vcons_out is currently unused.
     */
    uint vcons_in;
    uint vcons_out;

    /* Output (logging) buffer
     * Console output is written to a ring buffer log_buf at index log_idx.
     * The host may read the output when it sees log_idx advance.
     * Output will be lost if the output wraps around faster than the host
     * polls.
     */
    struct rte_log_le log_le;

    /* Console input line buffer
     * Characters are read one at a time into cbuf
     * until <CR> is received, then
     * the buffer is processed as a command line.
     * Also used for virtual UART.
     */
    uint cbuf_idx;
    char cbuf[CBUF_LEN];
};

#endif              /* DEBUG */
#include <chipcommon.h>

#include "dhd_bus.h"
#include "dhd_dbg.h"

#define TXQLEN      2048    /* bulk tx queue length */
#define TXHI        (TXQLEN - 256)  /* turn on flow control above TXHI */
#define TXLOW       (TXHI - 256)    /* turn off flow control below TXLOW */
#define PRIOMASK    7

#define TXRETRIES   2   /* # of retries for tx frames */

#define BRCMF_RXBOUND   50  /* Default for max rx frames in
                 one scheduling */

#define BRCMF_TXBOUND   20  /* Default for max tx frames in
                 one scheduling */

#define BRCMF_TXMINMAX  1   /* Max tx frames if rx still pending */

#define MEMBLOCK    2048    /* Block size used for downloading
                 of dongle image */
#define MAX_DATA_BUF    (32 * 1024) /* Must be large enough to hold
                 biggest possible glom */

#define BRCMF_FIRSTREAD (1 << 6)


/* SBSDIO_DEVICE_CTL */

/* 1: device will assert busy signal when receiving CMD53 */
#define SBSDIO_DEVCTL_SETBUSY       0x01
/* 1: assertion of sdio interrupt is synchronous to the sdio clock */
#define SBSDIO_DEVCTL_SPI_INTR_SYNC 0x02
/* 1: mask all interrupts to host except the chipActive (rev 8) */
#define SBSDIO_DEVCTL_CA_INT_ONLY   0x04
/* 1: isolate internal sdio signals, put external pads in tri-state; requires
 * sdio bus power cycle to clear (rev 9) */
#define SBSDIO_DEVCTL_PADS_ISO      0x08
/* Force SD->SB reset mapping (rev 11) */
#define SBSDIO_DEVCTL_SB_RST_CTL    0x30
/*   Determined by CoreControl bit */
#define SBSDIO_DEVCTL_RST_CORECTL   0x00
/*   Force backplane reset */
#define SBSDIO_DEVCTL_RST_BPRESET   0x10
/*   Force no backplane reset */
#define SBSDIO_DEVCTL_RST_NOBPRESET 0x20

/* direct(mapped) cis space */

/* MAPPED common CIS address */
#define SBSDIO_CIS_BASE_COMMON      0x1000
/* maximum bytes in one CIS */
#define SBSDIO_CIS_SIZE_LIMIT       0x200
/* cis offset addr is < 17 bits */
#define SBSDIO_CIS_OFT_ADDR_MASK    0x1FFFF

/* manfid tuple length, include tuple, link bytes */
#define SBSDIO_CIS_MANFID_TUPLE_LEN 6

/* intstatus */
#define I_SMB_SW0   (1 << 0)    /* To SB Mail S/W interrupt 0 */
#define I_SMB_SW1   (1 << 1)    /* To SB Mail S/W interrupt 1 */
#define I_SMB_SW2   (1 << 2)    /* To SB Mail S/W interrupt 2 */
#define I_SMB_SW3   (1 << 3)    /* To SB Mail S/W interrupt 3 */
#define I_SMB_SW_MASK   0x0000000f  /* To SB Mail S/W interrupts mask */
#define I_SMB_SW_SHIFT  0   /* To SB Mail S/W interrupts shift */
#define I_HMB_SW0   (1 << 4)    /* To Host Mail S/W interrupt 0 */
#define I_HMB_SW1   (1 << 5)    /* To Host Mail S/W interrupt 1 */
#define I_HMB_SW2   (1 << 6)    /* To Host Mail S/W interrupt 2 */
#define I_HMB_SW3   (1 << 7)    /* To Host Mail S/W interrupt 3 */
#define I_HMB_SW_MASK   0x000000f0  /* To Host Mail S/W interrupts mask */
#define I_HMB_SW_SHIFT  4   /* To Host Mail S/W interrupts shift */
#define I_WR_OOSYNC (1 << 8)    /* Write Frame Out Of Sync */
#define I_RD_OOSYNC (1 << 9)    /* Read Frame Out Of Sync */
#define I_PC        (1 << 10)   /* descriptor error */
#define I_PD        (1 << 11)   /* data error */
#define I_DE        (1 << 12)   /* Descriptor protocol Error */
#define I_RU        (1 << 13)   /* Receive descriptor Underflow */
#define I_RO        (1 << 14)   /* Receive fifo Overflow */
#define I_XU        (1 << 15)   /* Transmit fifo Underflow */
#define I_RI        (1 << 16)   /* Receive Interrupt */
#define I_BUSPWR    (1 << 17)   /* SDIO Bus Power Change (rev 9) */
#define I_XMTDATA_AVAIL (1 << 23)   /* bits in fifo */
#define I_XI        (1 << 24)   /* Transmit Interrupt */
#define I_RF_TERM   (1 << 25)   /* Read Frame Terminate */
#define I_WF_TERM   (1 << 26)   /* Write Frame Terminate */
#define I_PCMCIA_XU (1 << 27)   /* PCMCIA Transmit FIFO Underflow */
#define I_SBINT     (1 << 28)   /* sbintstatus Interrupt */
#define I_CHIPACTIVE    (1 << 29)   /* chip from doze to active state */
#define I_SRESET    (1 << 30)   /* CCCR RES interrupt */
#define I_IOE2      (1U << 31)  /* CCCR IOE2 Bit Changed */
#define I_ERRORS    (I_PC | I_PD | I_DE | I_RU | I_RO | I_XU)
#define I_DMA       (I_RI | I_XI | I_ERRORS)

/* corecontrol */
#define CC_CISRDY       (1 << 0)    /* CIS Ready */
#define CC_BPRESEN      (1 << 1)    /* CCCR RES signal */
#define CC_F2RDY        (1 << 2)    /* set CCCR IOR2 bit */
#define CC_CLRPADSISO       (1 << 3)    /* clear SDIO pads isolation */
#define CC_XMTDATAAVAIL_MODE    (1 << 4)
#define CC_XMTDATAAVAIL_CTRL    (1 << 5)

/* SDA_FRAMECTRL */
#define SFC_RF_TERM (1 << 0)    /* Read Frame Terminate */
#define SFC_WF_TERM (1 << 1)    /* Write Frame Terminate */
#define SFC_CRC4WOOS    (1 << 2)    /* CRC error for write out of sync */
#define SFC_ABORTALL    (1 << 3)    /* Abort all in-progress frames */

/* HW frame tag */
#define SDPCM_FRAMETAG_LEN  4   /* 2 bytes len, 2 bytes check val */

/* Total length of frame header for dongle protocol */
#define SDPCM_HDRLEN    (SDPCM_FRAMETAG_LEN + SDPCM_SWHEADER_LEN)
#define SDPCM_RESERVE   (SDPCM_HDRLEN + BRCMF_SDALIGN)

/*
 * Software allocation of To SB Mailbox resources
 */

/* tosbmailbox bits corresponding to intstatus bits */
#define SMB_NAK     (1 << 0)    /* Frame NAK */
#define SMB_INT_ACK (1 << 1)    /* Host Interrupt ACK */
#define SMB_USE_OOB (1 << 2)    /* Use OOB Wakeup */
#define SMB_DEV_INT (1 << 3)    /* Miscellaneous Interrupt */

/* tosbmailboxdata */
#define SMB_DATA_VERSION_SHIFT  16  /* host protocol version */

/*
 * Software allocation of To Host Mailbox resources
 */

/* intstatus bits */
#define I_HMB_FC_STATE  I_HMB_SW0   /* Flow Control State */
#define I_HMB_FC_CHANGE I_HMB_SW1   /* Flow Control State Changed */
#define I_HMB_FRAME_IND I_HMB_SW2   /* Frame Indication */
#define I_HMB_HOST_INT  I_HMB_SW3   /* Miscellaneous Interrupt */

/* tohostmailboxdata */
#define HMB_DATA_NAKHANDLED 1   /* retransmit NAK'd frame */
#define HMB_DATA_DEVREADY   2   /* talk to host after enable */
#define HMB_DATA_FC     4   /* per prio flowcontrol update flag */
#define HMB_DATA_FWREADY    8   /* fw ready for protocol activity */

#define HMB_DATA_FCDATA_MASK    0xff000000
#define HMB_DATA_FCDATA_SHIFT   24

#define HMB_DATA_VERSION_MASK   0x00ff0000
#define HMB_DATA_VERSION_SHIFT  16

/*
 * Software-defined protocol header
 */

/* Current protocol version */
#define SDPCM_PROT_VERSION  4

/* SW frame header */
#define SDPCM_PACKET_SEQUENCE(p)    (((u8 *)p)[0] & 0xff)

#define SDPCM_CHANNEL_MASK      0x00000f00
#define SDPCM_CHANNEL_SHIFT     8
#define SDPCM_PACKET_CHANNEL(p)     (((u8 *)p)[1] & 0x0f)

#define SDPCM_NEXTLEN_OFFSET        2

/* Data Offset from SOF (HW Tag, SW Tag, Pad) */
#define SDPCM_DOFFSET_OFFSET        3   /* Data Offset */
#define SDPCM_DOFFSET_VALUE(p)      (((u8 *)p)[SDPCM_DOFFSET_OFFSET] & 0xff)
#define SDPCM_DOFFSET_MASK      0xff000000
#define SDPCM_DOFFSET_SHIFT     24
#define SDPCM_FCMASK_OFFSET     4   /* Flow control */
#define SDPCM_FCMASK_VALUE(p)       (((u8 *)p)[SDPCM_FCMASK_OFFSET] & 0xff)
#define SDPCM_WINDOW_OFFSET     5   /* Credit based fc */
#define SDPCM_WINDOW_VALUE(p)       (((u8 *)p)[SDPCM_WINDOW_OFFSET] & 0xff)

#define SDPCM_SWHEADER_LEN  8   /* SW header is 64 bits */

/* logical channel numbers */
#define SDPCM_CONTROL_CHANNEL   0   /* Control channel Id */
#define SDPCM_EVENT_CHANNEL 1   /* Asyc Event Indication Channel Id */
#define SDPCM_DATA_CHANNEL  2   /* Data Xmit/Recv Channel Id */
#define SDPCM_GLOM_CHANNEL  3   /* For coalesced packets */
#define SDPCM_TEST_CHANNEL  15  /* Reserved for test/debug packets */

#define SDPCM_SEQUENCE_WRAP 256 /* wrap-around val for 8bit frame seq */

#define SDPCM_GLOMDESC(p)   (((u8 *)p)[1] & 0x80)

/*
 * Shared structure between dongle and the host.
 * The structure contains pointers to trap or assert information.
 */
#define SDPCM_SHARED_VERSION       0x0003
#define SDPCM_SHARED_VERSION_MASK  0x00FF
#define SDPCM_SHARED_ASSERT_BUILT  0x0100
#define SDPCM_SHARED_ASSERT        0x0200
#define SDPCM_SHARED_TRAP          0x0400

/* Space for header read, limit for data packets */
#define MAX_HDR_READ    (1 << 6)
#define MAX_RX_DATASZ   2048

/* Maximum milliseconds to wait for F2 to come up */
#define BRCMF_WAIT_F2RDY    3000

/* Bump up limit on waiting for HT to account for first startup;
 * if the image is doing a CRC calculation before programming the PMU
 * for HT availability, it could take a couple hundred ms more, so
 * max out at a 1 second (1000000us).
 */
#undef PMU_MAX_TRANSITION_DLY
#define PMU_MAX_TRANSITION_DLY 1000000

/* Value for ChipClockCSR during initial setup */
#define BRCMF_INIT_CLKCTL1  (SBSDIO_FORCE_HW_CLKREQ_OFF |   \
                    SBSDIO_ALP_AVAIL_REQ)

/* Flags for SDH calls */
#define F2SYNC  (SDIO_REQ_4BYTE | SDIO_REQ_FIXED)

#define BRCMF_SDIO_FW_NAME  "brcm/brcmfmac-sdio.bin"
#define BRCMF_SDIO_NV_NAME  "brcm/brcmfmac-sdio.txt"
MODULE_FIRMWARE(BRCMF_SDIO_FW_NAME);
MODULE_FIRMWARE(BRCMF_SDIO_NV_NAME);

#define BRCMF_IDLE_IMMEDIATE    (-1)    /* Enter idle immediately */
#define BRCMF_IDLE_ACTIVE   0   /* Do not request any SD clock change
                     * when idle
                     */
#define BRCMF_IDLE_INTERVAL 1

/*
 * Conversion of 802.1D priority to precedence level
 */
static uint prio2prec(u32 prio)
{
    return (prio == PRIO_8021D_NONE || prio == PRIO_8021D_BE) ?
           (prio^2) : prio;
}

/* core registers */
struct sdpcmd_regs {
    u32 corecontrol;        /* 0x00, rev8 */
    u32 corestatus;         /* rev8 */
    u32 PAD[1];
    u32 biststatus;         /* rev8 */

    /* PCMCIA access */
    u16 pcmciamesportaladdr;    /* 0x010, rev8 */
    u16 PAD[1];
    u16 pcmciamesportalmask;    /* rev8 */
    u16 PAD[1];
    u16 pcmciawrframebc;        /* rev8 */
    u16 PAD[1];
    u16 pcmciaunderflowtimer;   /* rev8 */
    u16 PAD[1];

    /* interrupt */
    u32 intstatus;          /* 0x020, rev8 */
    u32 hostintmask;        /* rev8 */
    u32 intmask;            /* rev8 */
    u32 sbintstatus;        /* rev8 */
    u32 sbintmask;          /* rev8 */
    u32 funcintmask;        /* rev4 */
    u32 PAD[2];
    u32 tosbmailbox;        /* 0x040, rev8 */
    u32 tohostmailbox;      /* rev8 */
    u32 tosbmailboxdata;        /* rev8 */
    u32 tohostmailboxdata;      /* rev8 */

    /* synchronized access to registers in SDIO clock domain */
    u32 sdioaccess;         /* 0x050, rev8 */
    u32 PAD[3];

    /* PCMCIA frame control */
    u8 pcmciaframectrl;     /* 0x060, rev8 */
    u8 PAD[3];
    u8 pcmciawatermark;     /* rev8 */
    u8 PAD[155];

    /* interrupt batching control */
    u32 intrcvlazy;         /* 0x100, rev8 */
    u32 PAD[3];

    /* counters */
    u32 cmd52rd;            /* 0x110, rev8 */
    u32 cmd52wr;            /* rev8 */
    u32 cmd53rd;            /* rev8 */
    u32 cmd53wr;            /* rev8 */
    u32 abort;          /* rev8 */
    u32 datacrcerror;       /* rev8 */
    u32 rdoutofsync;        /* rev8 */
    u32 wroutofsync;        /* rev8 */
    u32 writebusy;          /* rev8 */
    u32 readwait;           /* rev8 */
    u32 readterm;           /* rev8 */
    u32 writeterm;          /* rev8 */
    u32 PAD[40];
    u32 clockctlstatus;     /* rev8 */
    u32 PAD[7];

    u32 PAD[128];           /* DMA engines */

    /* SDIO/PCMCIA CIS region */
    char cis[512];          /* 0x400-0x5ff, rev6 */

    /* PCMCIA function control registers */
    char pcmciafcr[256];        /* 0x600-6ff, rev6 */
    u16 PAD[55];

    /* PCMCIA backplane access */
    u16 backplanecsr;       /* 0x76E, rev6 */
    u16 backplaneaddr0;     /* rev6 */
    u16 backplaneaddr1;     /* rev6 */
    u16 backplaneaddr2;     /* rev6 */
    u16 backplaneaddr3;     /* rev6 */
    u16 backplanedata0;     /* rev6 */
    u16 backplanedata1;     /* rev6 */
    u16 backplanedata2;     /* rev6 */
    u16 backplanedata3;     /* rev6 */
    u16 PAD[31];

    /* sprom "size" & "blank" info */
    u16 spromstatus;        /* 0x7BE, rev2 */
    u32 PAD[464];

    u16 PAD[0x80];
};

#ifdef DEBUG
/* Device console log buffer state */
struct brcmf_console {
    uint count;     /* Poll interval msec counter */
    uint log_addr;      /* Log struct address (fixed) */
    struct rte_log_le log_le;   /* Log struct (host copy) */
    uint bufsize;       /* Size of log buffer */
    u8 *buf;        /* Log buffer (host copy) */
    uint last;      /* Last buffer read index */
};

struct brcmf_trap_info {
    __le32      type;
    __le32      epc;
    __le32      cpsr;
    __le32      spsr;
    __le32      r0; /* a1 */
    __le32      r1; /* a2 */
    __le32      r2; /* a3 */
    __le32      r3; /* a4 */
    __le32      r4; /* v1 */
    __le32      r5; /* v2 */
    __le32      r6; /* v3 */
    __le32      r7; /* v4 */
    __le32      r8; /* v5 */
    __le32      r9; /* sb/v6 */
    __le32      r10;    /* sl/v7 */
    __le32      r11;    /* fp/v8 */
    __le32      r12;    /* ip */
    __le32      r13;    /* sp */
    __le32      r14;    /* lr */
    __le32      pc; /* r15 */
};
#endif              /* DEBUG */

struct sdpcm_shared {
    u32 flags;
    u32 trap_addr;
    u32 assert_exp_addr;
    u32 assert_file_addr;
    u32 assert_line;
    u32 console_addr;   /* Address of struct rte_console */
    u32 msgtrace_addr;
    u8 tag[32];
    u32 brpt_addr;
};

struct sdpcm_shared_le {
    __le32 flags;
    __le32 trap_addr;
    __le32 assert_exp_addr;
    __le32 assert_file_addr;
    __le32 assert_line;
    __le32 console_addr;    /* Address of struct rte_console */
    __le32 msgtrace_addr;
    u8 tag[32];
    __le32 brpt_addr;
};

/* SDIO read frame info */
struct brcmf_sdio_read {
    u8 seq_num;
    u8 channel;
    u16 len;
    u16 len_left;
    u16 len_nxtfrm;
    u8 dat_offset;
};

/* misc chip info needed by some of the routines */
/* Private data for SDIO bus interaction */
struct brcmf_sdio {
    struct brcmf_sdio_dev *sdiodev; /* sdio device handler */
    struct chip_info *ci;   /* Chip info struct */
    char *vars;     /* Variables (from CIS and/or other) */
    uint varsz;     /* Size of variables buffer */

    u32 ramsize;        /* Size of RAM in SOCRAM (bytes) */

    u32 hostintmask;    /* Copy of Host Interrupt Mask */
    atomic_t intstatus; /* Intstatus bits (events) pending */
    atomic_t fcstate;   /* State of dongle flow-control */

    uint blocksize;     /* Block size of SDIO transfers */
    uint roundup;       /* Max roundup limit */

    struct pktq txq;    /* Queue length used for flow-control */
    u8 flowcontrol; /* per prio flow control bitmask */
    u8 tx_seq;      /* Transmit sequence number (next) */
    u8 tx_max;      /* Maximum transmit sequence allowed */

    u8 hdrbuf[MAX_HDR_READ + BRCMF_SDALIGN];
    u8 *rxhdr;      /* Header of current rx frame (in hdrbuf) */
    u8 rx_seq;      /* Receive sequence number (expected) */
    struct brcmf_sdio_read cur_read;
                /* info of current read frame */
    bool rxskip;        /* Skip receive (awaiting NAK ACK) */
    bool rxpending;     /* Data frame pending in dongle */

    uint rxbound;       /* Rx frames to read before resched */
    uint txbound;       /* Tx frames to send before resched */
    uint txminmax;

    struct sk_buff *glomd;  /* Packet containing glomming descriptor */
    struct sk_buff_head glom; /* Packet list for glommed superframe */
    uint glomerr;       /* Glom packet read errors */

    u8 *rxbuf;      /* Buffer for receiving control packets */
    uint rxblen;        /* Allocated length of rxbuf */
    u8 *rxctl;      /* Aligned pointer into rxbuf */
    u8 *databuf;        /* Buffer for receiving big glom packet */
    u8 *dataptr;        /* Aligned pointer into databuf */
    uint rxlen;     /* Length of valid data in buffer */

    u8 sdpcm_ver;   /* Bus protocol reported by dongle */

    bool intr;      /* Use interrupts */
    bool poll;      /* Use polling */
    atomic_t ipend;     /* Device interrupt is pending */
    uint spurious;      /* Count of spurious interrupts */
    uint pollrate;      /* Ticks between device polls */
    uint polltick;      /* Tick counter */

#ifdef DEBUG
    uint console_interval;
    struct brcmf_console console;   /* Console output polling support */
    uint console_addr;  /* Console address from shared struct */
#endif              /* DEBUG */

    uint clkstate;      /* State of sd and backplane clock(s) */
    bool activity;      /* Activity flag for clock down */
    s32 idletime;       /* Control for activity timeout */
    s32 idlecount;  /* Activity timeout counter */
    s32 idleclock;  /* How to set bus driver when idle */
    s32 sd_rxchain;
    bool use_rxchain;   /* If brcmf should use PKT chains */
    bool rxflow_mode;   /* Rx flow control mode */
    bool rxflow;        /* Is rx flow control on */
    bool alp_only;      /* Don't use HT clock (ALP only) */

    u8 *ctrl_frame_buf;
    u32 ctrl_frame_len;
    bool ctrl_frame_stat;

    spinlock_t txqlock;
    wait_queue_head_t ctrl_wait;
    wait_queue_head_t dcmd_resp_wait;

    struct timer_list timer;
    struct completion watchdog_wait;
    struct task_struct *watchdog_tsk;
    bool wd_timer_valid;
    uint save_ms;

    struct workqueue_struct *brcmf_wq;
    struct work_struct datawork;
    struct list_head dpc_tsklst;
    spinlock_t dpc_tl_lock;

    struct semaphore sdsem;

    const struct firmware *firmware;
    u32 fw_ptr;

    bool txoff;     /* Transmit flow-controlled */
    struct brcmf_sdio_count sdcnt;
};

/* clkstate */
#define CLK_NONE    0
#define CLK_SDONLY  1
#define CLK_PENDING 2   /* Not used yet */
#define CLK_AVAIL   3

#ifdef DEBUG
static int qcount[NUMPRIO];
static int tx_packets[NUMPRIO];
#endif              /* DEBUG */

#define SDIO_DRIVE_STRENGTH 6   /* in milliamps */

#define RETRYCHAN(chan) ((chan) == SDPCM_EVENT_CHANNEL)

/* Retry count for register access failures */
static const uint retry_limit = 2;

/* Limit on rounding up frames */
static const uint max_roundup = 512;

#define ALIGNMENT  4

static void pkt_align(struct sk_buff *p, int len, int align)
{
    uint datalign;
    datalign = (unsigned long)(p->data);
    datalign = roundup(datalign, (align)) - datalign;
    if (datalign)
        skb_pull(p, datalign);
    __skb_trim(p, len);
}

/* To check if there's window offered */
static bool data_ok(struct brcmf_sdio *bus)
{
    return (u8)(bus->tx_max - bus->tx_seq) != 0 &&
           ((u8)(bus->tx_max - bus->tx_seq) & 0x80) == 0;
}

/*
 * Reads a register in the SDIO hardware block. This block occupies a series of
 * adresses on the 32 bit backplane bus.
 */
static int
r_sdreg32(struct brcmf_sdio *bus, u32 *regvar, u32 offset)
{
    u8 idx = brcmf_sdio_chip_getinfidx(bus->ci, BCMA_CORE_SDIO_DEV);
    int ret;

    *regvar = brcmf_sdio_regrl(bus->sdiodev,
                   bus->ci->c_inf[idx].base + offset, &ret);

    return ret;
}

static int
w_sdreg32(struct brcmf_sdio *bus, u32 regval, u32 reg_offset)
{
    u8 idx = brcmf_sdio_chip_getinfidx(bus->ci, BCMA_CORE_SDIO_DEV);
    int ret;

    brcmf_sdio_regwl(bus->sdiodev,
             bus->ci->c_inf[idx].base + reg_offset,
             regval, &ret);

    return ret;
}

#define PKT_AVAILABLE()     (intstatus & I_HMB_FRAME_IND)

#define HOSTINTMASK     (I_HMB_SW_MASK | I_CHIPACTIVE)

/* Turn backplane clock on or off */
static int brcmf_sdbrcm_htclk(struct brcmf_sdio *bus, bool on, bool pendok)
{
    int err;
    u8 clkctl, clkreq, devctl;
    unsigned long timeout;

    brcmf_dbg(TRACE, "Enter\n");

    clkctl = 0;

    if (on) {
        /* Request HT Avail */
        clkreq =
            bus->alp_only ? SBSDIO_ALP_AVAIL_REQ : SBSDIO_HT_AVAIL_REQ;

        brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
                 clkreq, &err);
        if (err) {
            brcmf_dbg(ERROR, "HT Avail request error: %d\n", err);
            return -EBADE;
        }

        /* Check current status */
        clkctl = brcmf_sdio_regrb(bus->sdiodev,
                      SBSDIO_FUNC1_CHIPCLKCSR, &err);
        if (err) {
            brcmf_dbg(ERROR, "HT Avail read error: %d\n", err);
            return -EBADE;
        }

        /* Go to pending and await interrupt if appropriate */
        if (!SBSDIO_CLKAV(clkctl, bus->alp_only) && pendok) {
            /* Allow only clock-available interrupt */
            devctl = brcmf_sdio_regrb(bus->sdiodev,
                          SBSDIO_DEVICE_CTL, &err);
            if (err) {
                brcmf_dbg(ERROR, "Devctl error setting CA: %d\n",
                      err);
                return -EBADE;
            }

            devctl |= SBSDIO_DEVCTL_CA_INT_ONLY;
            brcmf_sdio_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
                     devctl, &err);
            brcmf_dbg(INFO, "CLKCTL: set PENDING\n");
            bus->clkstate = CLK_PENDING;

            return 0;
        } else if (bus->clkstate == CLK_PENDING) {
            /* Cancel CA-only interrupt filter */
            devctl = brcmf_sdio_regrb(bus->sdiodev,
                          SBSDIO_DEVICE_CTL, &err);
            devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
            brcmf_sdio_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
                     devctl, &err);
        }

        /* Otherwise, wait here (polling) for HT Avail */
        timeout = jiffies +
              msecs_to_jiffies(PMU_MAX_TRANSITION_DLY/1000);
        while (!SBSDIO_CLKAV(clkctl, bus->alp_only)) {
            clkctl = brcmf_sdio_regrb(bus->sdiodev,
                          SBSDIO_FUNC1_CHIPCLKCSR,
                          &err);
            if (time_after(jiffies, timeout))
                break;
            else
                usleep_range(5000, 10000);
        }
        if (err) {
            brcmf_dbg(ERROR, "HT Avail request error: %d\n", err);
            return -EBADE;
        }
        if (!SBSDIO_CLKAV(clkctl, bus->alp_only)) {
            brcmf_dbg(ERROR, "HT Avail timeout (%d): clkctl 0x%02x\n",
                  PMU_MAX_TRANSITION_DLY, clkctl);
            return -EBADE;
        }

        /* Mark clock available */
        bus->clkstate = CLK_AVAIL;
        brcmf_dbg(INFO, "CLKCTL: turned ON\n");

#if defined(DEBUG)
        if (!bus->alp_only) {
            if (SBSDIO_ALPONLY(clkctl))
                brcmf_dbg(ERROR, "HT Clock should be on\n");
        }
#endif              /* defined (DEBUG) */

        bus->activity = true;
    } else {
        clkreq = 0;

        if (bus->clkstate == CLK_PENDING) {
            /* Cancel CA-only interrupt filter */
            devctl = brcmf_sdio_regrb(bus->sdiodev,
                          SBSDIO_DEVICE_CTL, &err);
            devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
            brcmf_sdio_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
                     devctl, &err);
        }

        bus->clkstate = CLK_SDONLY;
        brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
                 clkreq, &err);
        brcmf_dbg(INFO, "CLKCTL: turned OFF\n");
        if (err) {
            brcmf_dbg(ERROR, "Failed access turning clock off: %d\n",
                  err);
            return -EBADE;
        }
    }
    return 0;
}

/* Change idle/active SD state */
static int brcmf_sdbrcm_sdclk(struct brcmf_sdio *bus, bool on)
{
    brcmf_dbg(TRACE, "Enter\n");

    if (on)
        bus->clkstate = CLK_SDONLY;
    else
        bus->clkstate = CLK_NONE;

    return 0;
}

/* Transition SD and backplane clock readiness */
static int brcmf_sdbrcm_clkctl(struct brcmf_sdio *bus, uint target, bool pendok)
{
#ifdef DEBUG
    uint oldstate = bus->clkstate;
#endif              /* DEBUG */

    brcmf_dbg(TRACE, "Enter\n");

    /* Early exit if we're already there */
    if (bus->clkstate == target) {
        if (target == CLK_AVAIL) {
            brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
            bus->activity = true;
        }
        return 0;
    }

    switch (target) {
    case CLK_AVAIL:
        /* Make sure SD clock is available */
        if (bus->clkstate == CLK_NONE)
            brcmf_sdbrcm_sdclk(bus, true);
        /* Now request HT Avail on the backplane */
        brcmf_sdbrcm_htclk(bus, true, pendok);
        brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
        bus->activity = true;
        break;

    case CLK_SDONLY:
        /* Remove HT request, or bring up SD clock */
        if (bus->clkstate == CLK_NONE)
            brcmf_sdbrcm_sdclk(bus, true);
        else if (bus->clkstate == CLK_AVAIL)
            brcmf_sdbrcm_htclk(bus, false, false);
        else
            brcmf_dbg(ERROR, "request for %d -> %d\n",
                  bus->clkstate, target);
        brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
        break;

    case CLK_NONE:
        /* Make sure to remove HT request */
        if (bus->clkstate == CLK_AVAIL)
            brcmf_sdbrcm_htclk(bus, false, false);
        /* Now remove the SD clock */
        brcmf_sdbrcm_sdclk(bus, false);
        brcmf_sdbrcm_wd_timer(bus, 0);
        break;
    }
#ifdef DEBUG
    brcmf_dbg(INFO, "%d -> %d\n", oldstate, bus->clkstate);
#endif              /* DEBUG */

    return 0;
}

static u32 brcmf_sdbrcm_hostmail(struct brcmf_sdio *bus)
{
    u32 intstatus = 0;
    u32 hmb_data;
    u8 fcbits;
    int ret;

    brcmf_dbg(TRACE, "Enter\n");

    /* Read mailbox data and ack that we did so */
    ret = r_sdreg32(bus, &hmb_data,
            offsetof(struct sdpcmd_regs, tohostmailboxdata));

    if (ret == 0)
        w_sdreg32(bus, SMB_INT_ACK,
              offsetof(struct sdpcmd_regs, tosbmailbox));
    bus->sdcnt.f1regdata += 2;

    /* Dongle recomposed rx frames, accept them again */
    if (hmb_data & HMB_DATA_NAKHANDLED) {
        brcmf_dbg(INFO, "Dongle reports NAK handled, expect rtx of %d\n",
              bus->rx_seq);
        if (!bus->rxskip)
            brcmf_dbg(ERROR, "unexpected NAKHANDLED!\n");

        bus->rxskip = false;
        intstatus |= I_HMB_FRAME_IND;
    }

    /*
     * DEVREADY does not occur with gSPI.
     */
    if (hmb_data & (HMB_DATA_DEVREADY | HMB_DATA_FWREADY)) {
        bus->sdpcm_ver =
            (hmb_data & HMB_DATA_VERSION_MASK) >>
            HMB_DATA_VERSION_SHIFT;
        if (bus->sdpcm_ver != SDPCM_PROT_VERSION)
            brcmf_dbg(ERROR, "Version mismatch, dongle reports %d, "
                  "expecting %d\n",
                  bus->sdpcm_ver, SDPCM_PROT_VERSION);
        else
            brcmf_dbg(INFO, "Dongle ready, protocol version %d\n",
                  bus->sdpcm_ver);
    }

    /*
     * Flow Control has been moved into the RX headers and this out of band
     * method isn't used any more.
     * remaining backward compatible with older dongles.
     */
    if (hmb_data & HMB_DATA_FC) {
        fcbits = (hmb_data & HMB_DATA_FCDATA_MASK) >>
                            HMB_DATA_FCDATA_SHIFT;

        if (fcbits & ~bus->flowcontrol)
            bus->sdcnt.fc_xoff++;

        if (bus->flowcontrol & ~fcbits)
            bus->sdcnt.fc_xon++;

        bus->sdcnt.fc_rcvd++;
        bus->flowcontrol = fcbits;
    }

    /* Shouldn't be any others */
    if (hmb_data & ~(HMB_DATA_DEVREADY |
             HMB_DATA_NAKHANDLED |
             HMB_DATA_FC |
             HMB_DATA_FWREADY |
             HMB_DATA_FCDATA_MASK | HMB_DATA_VERSION_MASK))
        brcmf_dbg(ERROR, "Unknown mailbox data content: 0x%02x\n",
              hmb_data);

    return intstatus;
}

static void brcmf_sdbrcm_rxfail(struct brcmf_sdio *bus, bool abort, bool rtx)
{
    uint retries = 0;
    u16 lastrbc;
    u8 hi, lo;
    int err;

    brcmf_dbg(ERROR, "%sterminate frame%s\n",
          abort ? "abort command, " : "",
          rtx ? ", send NAK" : "");

    if (abort)
        brcmf_sdcard_abort(bus->sdiodev, SDIO_FUNC_2);

    brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_FRAMECTRL,
             SFC_RF_TERM, &err);
    bus->sdcnt.f1regdata++;

    /* Wait until the packet has been flushed (device/FIFO stable) */
    for (lastrbc = retries = 0xffff; retries > 0; retries--) {
        hi = brcmf_sdio_regrb(bus->sdiodev,
                      SBSDIO_FUNC1_RFRAMEBCHI, &err);
        lo = brcmf_sdio_regrb(bus->sdiodev,
                      SBSDIO_FUNC1_RFRAMEBCLO, &err);
        bus->sdcnt.f1regdata += 2;

        if ((hi == 0) && (lo == 0))
            break;

        if ((hi > (lastrbc >> 8)) && (lo > (lastrbc & 0x00ff))) {
            brcmf_dbg(ERROR, "count growing: last 0x%04x now 0x%04x\n",
                  lastrbc, (hi << 8) + lo);
        }
        lastrbc = (hi << 8) + lo;
    }

    if (!retries)
        brcmf_dbg(ERROR, "count never zeroed: last 0x%04x\n", lastrbc);
    else
        brcmf_dbg(INFO, "flush took %d iterations\n", 0xffff - retries);

    if (rtx) {
        bus->sdcnt.rxrtx++;
        err = w_sdreg32(bus, SMB_NAK,
                offsetof(struct sdpcmd_regs, tosbmailbox));

        bus->sdcnt.f1regdata++;
        if (err == 0)
            bus->rxskip = true;
    }

    /* Clear partial in any case */
    bus->cur_read.len = 0;

    /* If we can't reach the device, signal failure */
    if (err)
        bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
}

/* copy a buffer into a pkt buffer chain */
static uint brcmf_sdbrcm_glom_from_buf(struct brcmf_sdio *bus, uint len)
{
    uint n, ret = 0;
    struct sk_buff *p;
    u8 *buf;

    buf = bus->dataptr;

    /* copy the data */
    skb_queue_walk(&bus->glom, p) {
        n = min_t(uint, p->len, len);
        memcpy(p->data, buf, n);
        buf += n;
        len -= n;
        ret += n;
        if (!len)
            break;
    }

    return ret;
}

/* return total length of buffer chain */
static uint brcmf_sdbrcm_glom_len(struct brcmf_sdio *bus)
{
    struct sk_buff *p;
    uint total;

    total = 0;
    skb_queue_walk(&bus->glom, p)
        total += p->len;
    return total;
}

static void brcmf_sdbrcm_free_glom(struct brcmf_sdio *bus)
{
    struct sk_buff *cur, *next;

    skb_queue_walk_safe(&bus->glom, cur, next) {
        skb_unlink(cur, &bus->glom);
        brcmu_pkt_buf_free_skb(cur);
    }
}

static bool brcmf_sdio_hdparser(struct brcmf_sdio *bus, u8 *header,
                struct brcmf_sdio_read *rd)
{
    u16 len, checksum;
    u8 rx_seq, fc, tx_seq_max;

    /*
     * 4 bytes hardware header (frame tag)
     * Byte 0~1: Frame length
     * Byte 2~3: Checksum, bit-wise inverse of frame length
     */
    len = get_unaligned_le16(header);
    checksum = get_unaligned_le16(header + sizeof(u16));
    /* All zero means no more to read */
    if (!(len | checksum)) {
        bus->rxpending = false;
        return false;
    }
    if ((u16)(~(len ^ checksum))) {
        brcmf_dbg(ERROR, "HW header checksum error\n");
        bus->sdcnt.rx_badhdr++;
        brcmf_sdbrcm_rxfail(bus, false, false);
        return false;
    }
    if (len < SDPCM_HDRLEN) {
        brcmf_dbg(ERROR, "HW header length error\n");
        return false;
    }
    rd->len = len;

    /*
     * 8 bytes hardware header
     * Byte 0: Rx sequence number
     * Byte 1: 4 MSB Channel number, 4 LSB arbitrary flag
     * Byte 2: Length of next data frame
     * Byte 3: Data offset
     * Byte 4: Flow control bits
     * Byte 5: Maximum Sequence number allow for Tx
     * Byte 6~7: Reserved
     */
    rx_seq = SDPCM_PACKET_SEQUENCE(&header[SDPCM_FRAMETAG_LEN]);
    rd->channel = SDPCM_PACKET_CHANNEL(&header[SDPCM_FRAMETAG_LEN]);
    if (len > MAX_RX_DATASZ && rd->channel != SDPCM_CONTROL_CHANNEL) {
        brcmf_dbg(ERROR, "HW header length too long\n");
        bus->sdiodev->bus_if->dstats.rx_errors++;
        bus->sdcnt.rx_toolong++;
        brcmf_sdbrcm_rxfail(bus, false, false);
        rd->len = 0;
        return false;
    }
    rd->dat_offset = SDPCM_DOFFSET_VALUE(&header[SDPCM_FRAMETAG_LEN]);
    if (rd->dat_offset < SDPCM_HDRLEN || rd->dat_offset > rd->len) {
        brcmf_dbg(ERROR, "seq %d: bad data offset\n", rx_seq);
        bus->sdcnt.rx_badhdr++;
        brcmf_sdbrcm_rxfail(bus, false, false);
        rd->len = 0;
        return false;
    }
    if (rd->seq_num != rx_seq) {
        brcmf_dbg(ERROR, "seq %d: sequence number error, expect %d\n",
              rx_seq, rd->seq_num);
        bus->sdcnt.rx_badseq++;
        rd->seq_num = rx_seq;
    }
    rd->len_nxtfrm = header[SDPCM_FRAMETAG_LEN + SDPCM_NEXTLEN_OFFSET];
    if (rd->len_nxtfrm << 4 > MAX_RX_DATASZ) {
        /* only warm for NON glom packet */
        if (rd->channel != SDPCM_GLOM_CHANNEL)
            brcmf_dbg(ERROR, "seq %d: next length error\n", rx_seq);
        rd->len_nxtfrm = 0;
    }
    fc = SDPCM_FCMASK_VALUE(&header[SDPCM_FRAMETAG_LEN]);
    if (bus->flowcontrol != fc) {
        if (~bus->flowcontrol & fc)
            bus->sdcnt.fc_xoff++;
        if (bus->flowcontrol & ~fc)
            bus->sdcnt.fc_xon++;
        bus->sdcnt.fc_rcvd++;
        bus->flowcontrol = fc;
    }
    tx_seq_max = SDPCM_WINDOW_VALUE(&header[SDPCM_FRAMETAG_LEN]);
    if ((u8)(tx_seq_max - bus->tx_seq) > 0x40) {
        brcmf_dbg(ERROR, "seq %d: max tx seq number error\n", rx_seq);
        tx_seq_max = bus->tx_seq + 2;
    }
    bus->tx_max = tx_seq_max;

    return true;
}

static u8 brcmf_sdbrcm_rxglom(struct brcmf_sdio *bus, u8 rxseq)
{
    u16 dlen, totlen;
    u8 *dptr, num = 0;

    u16 sublen, check;
    struct sk_buff *pfirst, *pnext;

    int errcode;
    u8 chan, seq, doff, sfdoff;
    u8 txmax;

    int ifidx = 0;
    bool usechain = bus->use_rxchain;
    u16 next_len;

    /* If packets, issue read(s) and send up packet chain */
    /* Return sequence numbers consumed? */

    brcmf_dbg(TRACE, "start: glomd %p glom %p\n",
          bus->glomd, skb_peek(&bus->glom));

    /* If there's a descriptor, generate the packet chain */
    if (bus->glomd) {
        pfirst = pnext = NULL;
        dlen = (u16) (bus->glomd->len);
        dptr = bus->glomd->data;
        if (!dlen || (dlen & 1)) {
            brcmf_dbg(ERROR, "bad glomd len(%d), ignore descriptor\n",
                  dlen);
            dlen = 0;
        }

        for (totlen = num = 0; dlen; num++) {
            /* Get (and move past) next length */
            sublen = get_unaligned_le16(dptr);
            dlen -= sizeof(u16);
            dptr += sizeof(u16);
            if ((sublen < SDPCM_HDRLEN) ||
                ((num == 0) && (sublen < (2 * SDPCM_HDRLEN)))) {
                brcmf_dbg(ERROR, "descriptor len %d bad: %d\n",
                      num, sublen);
                pnext = NULL;
                break;
            }
            if (sublen % BRCMF_SDALIGN) {
                brcmf_dbg(ERROR, "sublen %d not multiple of %d\n",
                      sublen, BRCMF_SDALIGN);
                usechain = false;
            }
            totlen += sublen;

            /* For last frame, adjust read len so total
                 is a block multiple */
            if (!dlen) {
                sublen +=
                    (roundup(totlen, bus->blocksize) - totlen);
                totlen = roundup(totlen, bus->blocksize);
            }

            /* Allocate/chain packet for next subframe */
            pnext = brcmu_pkt_buf_get_skb(sublen + BRCMF_SDALIGN);
            if (pnext == NULL) {
                brcmf_dbg(ERROR, "bcm_pkt_buf_get_skb failed, num %d len %d\n",
                      num, sublen);
                break;
            }
            skb_queue_tail(&bus->glom, pnext);

            /* Adhere to start alignment requirements */
            pkt_align(pnext, sublen, BRCMF_SDALIGN);
        }

        /* If all allocations succeeded, save packet chain
             in bus structure */
        if (pnext) {
            brcmf_dbg(GLOM, "allocated %d-byte packet chain for %d subframes\n",
                  totlen, num);
            if (BRCMF_GLOM_ON() && bus->cur_read.len &&
                totlen != bus->cur_read.len) {
                brcmf_dbg(GLOM, "glomdesc mismatch: nextlen %d glomdesc %d rxseq %d\n",
                      bus->cur_read.len, totlen, rxseq);
            }
            pfirst = pnext = NULL;
        } else {
            brcmf_sdbrcm_free_glom(bus);
            num = 0;
        }

        /* Done with descriptor packet */
        brcmu_pkt_buf_free_skb(bus->glomd);
        bus->glomd = NULL;
        bus->cur_read.len = 0;
    }

    /* Ok -- either we just generated a packet chain,
         or had one from before */
    if (!skb_queue_empty(&bus->glom)) {
        if (BRCMF_GLOM_ON()) {
            brcmf_dbg(GLOM, "try superframe read, packet chain:\n");
            skb_queue_walk(&bus->glom, pnext) {
                brcmf_dbg(GLOM, "    %p: %p len 0x%04x (%d)\n",
                      pnext, (u8 *) (pnext->data),
                      pnext->len, pnext->len);
            }
        }

        pfirst = skb_peek(&bus->glom);
        dlen = (u16) brcmf_sdbrcm_glom_len(bus);

        /* Do an SDIO read for the superframe.  Configurable iovar to
         * read directly into the chained packet, or allocate a large
         * packet and and copy into the chain.
         */
        if (usechain) {
            errcode = brcmf_sdcard_recv_chain(bus->sdiodev,
                    bus->sdiodev->sbwad,
                    SDIO_FUNC_2, F2SYNC, &bus->glom);
        } else if (bus->dataptr) {
            errcode = brcmf_sdcard_recv_buf(bus->sdiodev,
                    bus->sdiodev->sbwad,
                    SDIO_FUNC_2, F2SYNC,
                    bus->dataptr, dlen);
            sublen = (u16) brcmf_sdbrcm_glom_from_buf(bus, dlen);
            if (sublen != dlen) {
                brcmf_dbg(ERROR, "FAILED TO COPY, dlen %d sublen %d\n",
                      dlen, sublen);
                errcode = -1;
            }
            pnext = NULL;
        } else {
            brcmf_dbg(ERROR, "COULDN'T ALLOC %d-BYTE GLOM, FORCE FAILURE\n",
                  dlen);
            errcode = -1;
        }
        bus->sdcnt.f2rxdata++;

        /* On failure, kill the superframe, allow a couple retries */
        if (errcode < 0) {
            brcmf_dbg(ERROR, "glom read of %d bytes failed: %d\n",
                  dlen, errcode);
            bus->sdiodev->bus_if->dstats.rx_errors++;

            if (bus->glomerr++ < 3) {
                brcmf_sdbrcm_rxfail(bus, true, true);
            } else {
                bus->glomerr = 0;
                brcmf_sdbrcm_rxfail(bus, true, false);
                bus->sdcnt.rxglomfail++;
                brcmf_sdbrcm_free_glom(bus);
            }
            return 0;
        }

        brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
                   pfirst->data, min_t(int, pfirst->len, 48),
                   "SUPERFRAME:\n");

        /* Validate the superframe header */
        dptr = (u8 *) (pfirst->data);
        sublen = get_unaligned_le16(dptr);
        check = get_unaligned_le16(dptr + sizeof(u16));

        chan = SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]);
        seq = SDPCM_PACKET_SEQUENCE(&dptr[SDPCM_FRAMETAG_LEN]);
        next_len = dptr[SDPCM_FRAMETAG_LEN + SDPCM_NEXTLEN_OFFSET];
        if ((next_len << 4) > MAX_RX_DATASZ) {
            brcmf_dbg(INFO, "nextlen too large (%d) seq %d\n",
                  next_len, seq);
            next_len = 0;
        }
        bus->cur_read.len = next_len << 4;
        doff = SDPCM_DOFFSET_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);
        txmax = SDPCM_WINDOW_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);

        errcode = 0;
        if ((u16)~(sublen ^ check)) {
            brcmf_dbg(ERROR, "(superframe): HW hdr error: len/check 0x%04x/0x%04x\n",
                  sublen, check);
            errcode = -1;
        } else if (roundup(sublen, bus->blocksize) != dlen) {
            brcmf_dbg(ERROR, "(superframe): len 0x%04x, rounded 0x%04x, expect 0x%04x\n",
                  sublen, roundup(sublen, bus->blocksize),
                  dlen);
            errcode = -1;
        } else if (SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]) !=
               SDPCM_GLOM_CHANNEL) {
            brcmf_dbg(ERROR, "(superframe): bad channel %d\n",
                  SDPCM_PACKET_CHANNEL(
                      &dptr[SDPCM_FRAMETAG_LEN]));
            errcode = -1;
        } else if (SDPCM_GLOMDESC(&dptr[SDPCM_FRAMETAG_LEN])) {
            brcmf_dbg(ERROR, "(superframe): got 2nd descriptor?\n");
            errcode = -1;
        } else if ((doff < SDPCM_HDRLEN) ||
               (doff > (pfirst->len - SDPCM_HDRLEN))) {
            brcmf_dbg(ERROR, "(superframe): Bad data offset %d: HW %d pkt %d min %d\n",
                  doff, sublen, pfirst->len, SDPCM_HDRLEN);
            errcode = -1;
        }

        /* Check sequence number of superframe SW header */
        if (rxseq != seq) {
            brcmf_dbg(INFO, "(superframe) rx_seq %d, expected %d\n",
                  seq, rxseq);
            bus->sdcnt.rx_badseq++;
            rxseq = seq;
        }

        /* Check window for sanity */
        if ((u8) (txmax - bus->tx_seq) > 0x40) {
            brcmf_dbg(ERROR, "unlikely tx max %d with tx_seq %d\n",
                  txmax, bus->tx_seq);
            txmax = bus->tx_seq + 2;
        }
        bus->tx_max = txmax;

        /* Remove superframe header, remember offset */
        skb_pull(pfirst, doff);
        sfdoff = doff;
        num = 0;

        /* Validate all the subframe headers */
        skb_queue_walk(&bus->glom, pnext) {
            /* leave when invalid subframe is found */
            if (errcode)
                break;

            dptr = (u8 *) (pnext->data);
            dlen = (u16) (pnext->len);
            sublen = get_unaligned_le16(dptr);
            check = get_unaligned_le16(dptr + sizeof(u16));
            chan = SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]);
            doff = SDPCM_DOFFSET_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);
            brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
                       dptr, 32, "subframe:\n");

            if ((u16)~(sublen ^ check)) {
                brcmf_dbg(ERROR, "(subframe %d): HW hdr error: len/check 0x%04x/0x%04x\n",
                      num, sublen, check);
                errcode = -1;
            } else if ((sublen > dlen) || (sublen < SDPCM_HDRLEN)) {
                brcmf_dbg(ERROR, "(subframe %d): length mismatch: len 0x%04x, expect 0x%04x\n",
                      num, sublen, dlen);
                errcode = -1;
            } else if ((chan != SDPCM_DATA_CHANNEL) &&
                   (chan != SDPCM_EVENT_CHANNEL)) {
                brcmf_dbg(ERROR, "(subframe %d): bad channel %d\n",
                      num, chan);
                errcode = -1;
            } else if ((doff < SDPCM_HDRLEN) || (doff > sublen)) {
                brcmf_dbg(ERROR, "(subframe %d): Bad data offset %d: HW %d min %d\n",
                      num, doff, sublen, SDPCM_HDRLEN);
                errcode = -1;
            }
            /* increase the subframe count */
            num++;
        }

        if (errcode) {
            /* Terminate frame on error, request
                 a couple retries */
            if (bus->glomerr++ < 3) {
                /* Restore superframe header space */
                skb_push(pfirst, sfdoff);
                brcmf_sdbrcm_rxfail(bus, true, true);
            } else {
                bus->glomerr = 0;
                brcmf_sdbrcm_rxfail(bus, true, false);
                bus->sdcnt.rxglomfail++;
                brcmf_sdbrcm_free_glom(bus);
            }
            bus->cur_read.len = 0;
            return 0;
        }

        /* Basic SD framing looks ok - process each packet (header) */

        skb_queue_walk_safe(&bus->glom, pfirst, pnext) {
            dptr = (u8 *) (pfirst->data);
            sublen = get_unaligned_le16(dptr);
            chan = SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]);
            seq = SDPCM_PACKET_SEQUENCE(&dptr[SDPCM_FRAMETAG_LEN]);
            doff = SDPCM_DOFFSET_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);

            brcmf_dbg(GLOM, "Get subframe %d, %p(%p/%d), sublen %d chan %d seq %d\n",
                  num, pfirst, pfirst->data,
                  pfirst->len, sublen, chan, seq);

            /* precondition: chan == SDPCM_DATA_CHANNEL ||
                     chan == SDPCM_EVENT_CHANNEL */

            if (rxseq != seq) {
                brcmf_dbg(GLOM, "rx_seq %d, expected %d\n",
                      seq, rxseq);
                bus->sdcnt.rx_badseq++;
                rxseq = seq;
            }
            rxseq++;

            brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_DATA_ON(),
                       dptr, dlen, "Rx Subframe Data:\n");

            __skb_trim(pfirst, sublen);
            skb_pull(pfirst, doff);

            if (pfirst->len == 0) {
                skb_unlink(pfirst, &bus->glom);
                brcmu_pkt_buf_free_skb(pfirst);
                continue;
            } else if (brcmf_proto_hdrpull(bus->sdiodev->dev,
                               &ifidx, pfirst) != 0) {
                brcmf_dbg(ERROR, "rx protocol error\n");
                bus->sdiodev->bus_if->dstats.rx_errors++;
                skb_unlink(pfirst, &bus->glom);
                brcmu_pkt_buf_free_skb(pfirst);
                continue;
            }

            brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
                       pfirst->data,
                       min_t(int, pfirst->len, 32),
                       "subframe %d to stack, %p (%p/%d) nxt/lnk %p/%p\n",
                       bus->glom.qlen, pfirst, pfirst->data,
                       pfirst->len, pfirst->next,
                       pfirst->prev);
        }
        /* sent any remaining packets up */
        if (bus->glom.qlen) {
            up(&bus->sdsem);
            brcmf_rx_frame(bus->sdiodev->dev, ifidx, &bus->glom);
            down(&bus->sdsem);
        }

        bus->sdcnt.rxglomframes++;
        bus->sdcnt.rxglompkts += bus->glom.qlen;
    }
    return num;
}

static int brcmf_sdbrcm_dcmd_resp_wait(struct brcmf_sdio *bus, uint *condition,
                    bool *pending)
{
    DECLARE_WAITQUEUE(wait, current);
    int timeout = msecs_to_jiffies(DCMD_RESP_TIMEOUT);

    /* Wait until control frame is available */
    add_wait_queue(&bus->dcmd_resp_wait, &wait);
    set_current_state(TASK_INTERRUPTIBLE);

    while (!(*condition) && (!signal_pending(current) && timeout))
        timeout = schedule_timeout(timeout);

    if (signal_pending(current))
        *pending = true;

    set_current_state(TASK_RUNNING);
    remove_wait_queue(&bus->dcmd_resp_wait, &wait);

    return timeout;
}

static int brcmf_sdbrcm_dcmd_resp_wake(struct brcmf_sdio *bus)
{
    if (waitqueue_active(&bus->dcmd_resp_wait))
        wake_up_interruptible(&bus->dcmd_resp_wait);

    return 0;
}
static void
brcmf_sdbrcm_read_control(struct brcmf_sdio *bus, u8 *hdr, uint len, uint doff)
{
    uint rdlen, pad;

    int sdret;

    brcmf_dbg(TRACE, "Enter\n");

    /* Set rxctl for frame (w/optional alignment) */
    bus->rxctl = bus->rxbuf;
    bus->rxctl += BRCMF_FIRSTREAD;
    pad = ((unsigned long)bus->rxctl % BRCMF_SDALIGN);
    if (pad)
        bus->rxctl += (BRCMF_SDALIGN - pad);
    bus->rxctl -= BRCMF_FIRSTREAD;

    /* Copy the already-read portion over */
    memcpy(bus->rxctl, hdr, BRCMF_FIRSTREAD);
    if (len <= BRCMF_FIRSTREAD)
        goto gotpkt;

    /* Raise rdlen to next SDIO block to avoid tail command */
    rdlen = len - BRCMF_FIRSTREAD;
    if (bus->roundup && bus->blocksize && (rdlen > bus->blocksize)) {
        pad = bus->blocksize - (rdlen % bus->blocksize);
        if ((pad <= bus->roundup) && (pad < bus->blocksize) &&
            ((len + pad) < bus->sdiodev->bus_if->maxctl))
            rdlen += pad;
    } else if (rdlen % BRCMF_SDALIGN) {
        rdlen += BRCMF_SDALIGN - (rdlen % BRCMF_SDALIGN);
    }

    /* Satisfy length-alignment requirements */
    if (rdlen & (ALIGNMENT - 1))
        rdlen = roundup(rdlen, ALIGNMENT);

    /* Drop if the read is too big or it exceeds our maximum */
    if ((rdlen + BRCMF_FIRSTREAD) > bus->sdiodev->bus_if->maxctl) {
        brcmf_dbg(ERROR, "%d-byte control read exceeds %d-byte buffer\n",
              rdlen, bus->sdiodev->bus_if->maxctl);
        bus->sdiodev->bus_if->dstats.rx_errors++;
        brcmf_sdbrcm_rxfail(bus, false, false);
        goto done;
    }

    if ((len - doff) > bus->sdiodev->bus_if->maxctl) {
        brcmf_dbg(ERROR, "%d-byte ctl frame (%d-byte ctl data) exceeds %d-byte limit\n",
              len, len - doff, bus->sdiodev->bus_if->maxctl);
        bus->sdiodev->bus_if->dstats.rx_errors++;
        bus->sdcnt.rx_toolong++;
        brcmf_sdbrcm_rxfail(bus, false, false);
        goto done;
    }

    /* Read remainder of frame body into the rxctl buffer */
    sdret = brcmf_sdcard_recv_buf(bus->sdiodev,
                bus->sdiodev->sbwad,
                SDIO_FUNC_2,
                F2SYNC, (bus->rxctl + BRCMF_FIRSTREAD), rdlen);
    bus->sdcnt.f2rxdata++;

    /* Control frame failures need retransmission */
    if (sdret < 0) {
        brcmf_dbg(ERROR, "read %d control bytes failed: %d\n",
              rdlen, sdret);
        bus->sdcnt.rxc_errors++;
        brcmf_sdbrcm_rxfail(bus, true, true);
        goto done;
    }

gotpkt:

    brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_CTL_ON(),
               bus->rxctl, len, "RxCtrl:\n");

    /* Point to valid data and indicate its length */
    bus->rxctl += doff;
    bus->rxlen = len - doff;

done:
    /* Awake any waiters */
    brcmf_sdbrcm_dcmd_resp_wake(bus);
}

/* Pad read to blocksize for efficiency */
static void brcmf_pad(struct brcmf_sdio *bus, u16 *pad, u16 *rdlen)
{
    if (bus->roundup && bus->blocksize && *rdlen > bus->blocksize) {
        *pad = bus->blocksize - (*rdlen % bus->blocksize);
        if (*pad <= bus->roundup && *pad < bus->blocksize &&
            *rdlen + *pad + BRCMF_FIRSTREAD < MAX_RX_DATASZ)
            *rdlen += *pad;
    } else if (*rdlen % BRCMF_SDALIGN) {
        *rdlen += BRCMF_SDALIGN - (*rdlen % BRCMF_SDALIGN);
    }
}

static uint brcmf_sdio_readframes(struct brcmf_sdio *bus, uint maxframes)
{
    struct sk_buff *pkt;        /* Packet for event or data frames */
    u16 pad;        /* Number of pad bytes to read */
    uint rxleft = 0;    /* Remaining number of frames allowed */
    int sdret;      /* Return code from calls */
    int ifidx = 0;
    uint rxcount = 0;   /* Total frames read */
    struct brcmf_sdio_read *rd = &bus->cur_read, rd_new;
    u8 head_read = 0;

    brcmf_dbg(TRACE, "Enter\n");

    /* Not finished unless we encounter no more frames indication */
    bus->rxpending = true;

    for (rd->seq_num = bus->rx_seq, rxleft = maxframes;
         !bus->rxskip && rxleft &&
         bus->sdiodev->bus_if->state != BRCMF_BUS_DOWN;
         rd->seq_num++, rxleft--) {

        /* Handle glomming separately */
        if (bus->glomd || !skb_queue_empty(&bus->glom)) {
            u8 cnt;
            brcmf_dbg(GLOM, "calling rxglom: glomd %p, glom %p\n",
                  bus->glomd, skb_peek(&bus->glom));
            cnt = brcmf_sdbrcm_rxglom(bus, rd->seq_num);
            brcmf_dbg(GLOM, "rxglom returned %d\n", cnt);
            rd->seq_num += cnt - 1;
            rxleft = (rxleft > cnt) ? (rxleft - cnt) : 1;
            continue;
        }

        rd->len_left = rd->len;
        /* read header first for unknow frame length */
        if (!rd->len) {
            sdret = brcmf_sdcard_recv_buf(bus->sdiodev,
                              bus->sdiodev->sbwad,
                              SDIO_FUNC_2, F2SYNC,
                              bus->rxhdr,
                              BRCMF_FIRSTREAD);
            bus->sdcnt.f2rxhdrs++;
            if (sdret < 0) {
                brcmf_dbg(ERROR, "RXHEADER FAILED: %d\n",
                      sdret);
                bus->sdcnt.rx_hdrfail++;
                brcmf_sdbrcm_rxfail(bus, true, true);
                continue;
            }

            brcmf_dbg_hex_dump(BRCMF_BYTES_ON() || BRCMF_HDRS_ON(),
                       bus->rxhdr, SDPCM_HDRLEN,
                       "RxHdr:\n");

            if (!brcmf_sdio_hdparser(bus, bus->rxhdr, rd)) {
                if (!bus->rxpending)
                    break;
                else
                    continue;
            }

            if (rd->channel == SDPCM_CONTROL_CHANNEL) {
                brcmf_sdbrcm_read_control(bus, bus->rxhdr,
                              rd->len,
                              rd->dat_offset);
                /* prepare the descriptor for the next read */
                rd->len = rd->len_nxtfrm << 4;
                rd->len_nxtfrm = 0;
                /* treat all packet as event if we don't know */
                rd->channel = SDPCM_EVENT_CHANNEL;
                continue;
            }
            rd->len_left = rd->len > BRCMF_FIRSTREAD ?
                       rd->len - BRCMF_FIRSTREAD : 0;
            head_read = BRCMF_FIRSTREAD;
        }

        brcmf_pad(bus, &pad, &rd->len_left);

        pkt = brcmu_pkt_buf_get_skb(rd->len_left + head_read +
                        BRCMF_SDALIGN);
        if (!pkt) {
            /* Give up on data, request rtx of events */
            brcmf_dbg(ERROR, "brcmu_pkt_buf_get_skb failed\n");
            bus->sdiodev->bus_if->dstats.rx_dropped++;
            brcmf_sdbrcm_rxfail(bus, false,
                        RETRYCHAN(rd->channel));
            continue;
        }
        skb_pull(pkt, head_read);
        pkt_align(pkt, rd->len_left, BRCMF_SDALIGN);

        sdret = brcmf_sdcard_recv_pkt(bus->sdiodev, bus->sdiodev->sbwad,
                          SDIO_FUNC_2, F2SYNC, pkt);
        bus->sdcnt.f2rxdata++;

        if (sdret < 0) {
            brcmf_dbg(ERROR, "read %d bytes from channel %d failed: %d\n",
                  rd->len, rd->channel, sdret);
            brcmu_pkt_buf_free_skb(pkt);
            bus->sdiodev->bus_if->dstats.rx_errors++;
            brcmf_sdbrcm_rxfail(bus, true,
                        RETRYCHAN(rd->channel));
            continue;
        }

        if (head_read) {
            skb_push(pkt, head_read);
            memcpy(pkt->data, bus->rxhdr, head_read);
            head_read = 0;
        } else {
            memcpy(bus->rxhdr, pkt->data, SDPCM_HDRLEN);
            rd_new.seq_num = rd->seq_num;
            if (!brcmf_sdio_hdparser(bus, bus->rxhdr, &rd_new)) {
                rd->len = 0;
                brcmu_pkt_buf_free_skb(pkt);
            }
            bus->sdcnt.rx_readahead_cnt++;
            if (rd->len != roundup(rd_new.len, 16)) {
                brcmf_dbg(ERROR, "frame length mismatch:read %d, should be %d\n",
                      rd->len,
                      roundup(rd_new.len, 16) >> 4);
                rd->len = 0;
                brcmf_sdbrcm_rxfail(bus, true, true);
                brcmu_pkt_buf_free_skb(pkt);
                continue;
            }
            rd->len_nxtfrm = rd_new.len_nxtfrm;
            rd->channel = rd_new.channel;
            rd->dat_offset = rd_new.dat_offset;

            brcmf_dbg_hex_dump(!(BRCMF_BYTES_ON() &&
                         BRCMF_DATA_ON()) &&
                       BRCMF_HDRS_ON(),
                       bus->rxhdr, SDPCM_HDRLEN,
                       "RxHdr:\n");

            if (rd_new.channel == SDPCM_CONTROL_CHANNEL) {
                brcmf_dbg(ERROR, "readahead on control packet %d?\n",
                      rd_new.seq_num);
                /* Force retry w/normal header read */
                rd->len = 0;
                brcmf_sdbrcm_rxfail(bus, false, true);
                brcmu_pkt_buf_free_skb(pkt);
                continue;
            }
        }

        brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_DATA_ON(),
                   pkt->data, rd->len, "Rx Data:\n");

        /* Save superframe descriptor and allocate packet frame */
        if (rd->channel == SDPCM_GLOM_CHANNEL) {
            if (SDPCM_GLOMDESC(&bus->rxhdr[SDPCM_FRAMETAG_LEN])) {
                brcmf_dbg(GLOM, "glom descriptor, %d bytes:\n",
                      rd->len);
                brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
                           pkt->data, rd->len,
                           "Glom Data:\n");
                __skb_trim(pkt, rd->len);
                skb_pull(pkt, SDPCM_HDRLEN);
                bus->glomd = pkt;
            } else {
                brcmf_dbg(ERROR, "%s: glom superframe w/o "
                      "descriptor!\n", __func__);
                brcmf_sdbrcm_rxfail(bus, false, false);
            }
            /* prepare the descriptor for the next read */
            rd->len = rd->len_nxtfrm << 4;
            rd->len_nxtfrm = 0;
            /* treat all packet as event if we don't know */
            rd->channel = SDPCM_EVENT_CHANNEL;
            continue;
        }

        /* Fill in packet len and prio, deliver upward */
        __skb_trim(pkt, rd->len);
        skb_pull(pkt, rd->dat_offset);

        /* prepare the descriptor for the next read */
        rd->len = rd->len_nxtfrm << 4;
        rd->len_nxtfrm = 0;
        /* treat all packet as event if we don't know */
        rd->channel = SDPCM_EVENT_CHANNEL;

        if (pkt->len == 0) {
            brcmu_pkt_buf_free_skb(pkt);
            continue;
        } else if (brcmf_proto_hdrpull(bus->sdiodev->dev, &ifidx,
               pkt) != 0) {
            brcmf_dbg(ERROR, "rx protocol error\n");
            brcmu_pkt_buf_free_skb(pkt);
            bus->sdiodev->bus_if->dstats.rx_errors++;
            continue;
        }

        /* Unlock during rx call */
        up(&bus->sdsem);
        brcmf_rx_packet(bus->sdiodev->dev, ifidx, pkt);
        down(&bus->sdsem);
    }

    rxcount = maxframes - rxleft;
    /* Message if we hit the limit */
    if (!rxleft)
        brcmf_dbg(DATA, "hit rx limit of %d frames\n", maxframes);
    else
        brcmf_dbg(DATA, "processed %d frames\n", rxcount);
    /* Back off rxseq if awaiting rtx, update rx_seq */
    if (bus->rxskip)
        rd->seq_num--;
    bus->rx_seq = rd->seq_num;

    return rxcount;
}

static void
brcmf_sdbrcm_wait_for_event(struct brcmf_sdio *bus, bool *lockvar)
{
    up(&bus->sdsem);
    wait_event_interruptible_timeout(bus->ctrl_wait, !*lockvar, HZ * 2);
    down(&bus->sdsem);
    return;
}

static void
brcmf_sdbrcm_wait_event_wakeup(struct brcmf_sdio *bus)
{
    if (waitqueue_active(&bus->ctrl_wait))
        wake_up_interruptible(&bus->ctrl_wait);
    return;
}

/* Writes a HW/SW header into the packet and sends it. */
/* Assumes: (a) header space already there, (b) caller holds lock */
static int brcmf_sdbrcm_txpkt(struct brcmf_sdio *bus, struct sk_buff *pkt,
                  uint chan, bool free_pkt)
{
    int ret;
    u8 *frame;
    u16 len, pad = 0;
    u32 swheader;
    struct sk_buff *new;
    int i;

    brcmf_dbg(TRACE, "Enter\n");

    frame = (u8 *) (pkt->data);

    /* Add alignment padding, allocate new packet if needed */
    pad = ((unsigned long)frame % BRCMF_SDALIGN);
    if (pad) {
        if (skb_headroom(pkt) < pad) {
            brcmf_dbg(INFO, "insufficient headroom %d for %d pad\n",
                  skb_headroom(pkt), pad);
            bus->sdiodev->bus_if->tx_realloc++;
            new = brcmu_pkt_buf_get_skb(pkt->len + BRCMF_SDALIGN);
            if (!new) {
                brcmf_dbg(ERROR, "couldn't allocate new %d-byte packet\n",
                      pkt->len + BRCMF_SDALIGN);
                ret = -ENOMEM;
                goto done;
            }

            pkt_align(new, pkt->len, BRCMF_SDALIGN);
            memcpy(new->data, pkt->data, pkt->len);
            if (free_pkt)
                brcmu_pkt_buf_free_skb(pkt);
            /* free the pkt if canned one is not used */
            free_pkt = true;
            pkt = new;
            frame = (u8 *) (pkt->data);
            /* precondition: (frame % BRCMF_SDALIGN) == 0) */
            pad = 0;
        } else {
            skb_push(pkt, pad);
            frame = (u8 *) (pkt->data);
            /* precondition: pad + SDPCM_HDRLEN <= pkt->len */
            memset(frame, 0, pad + SDPCM_HDRLEN);
        }
    }
    /* precondition: pad < BRCMF_SDALIGN */

    /* Hardware tag: 2 byte len followed by 2 byte ~len check (all LE) */
    len = (u16) (pkt->len);
    *(__le16 *) frame = cpu_to_le16(len);
    *(((__le16 *) frame) + 1) = cpu_to_le16(~len);

    /* Software tag: channel, sequence number, data offset */
    swheader =
        ((chan << SDPCM_CHANNEL_SHIFT) & SDPCM_CHANNEL_MASK) | bus->tx_seq |
        (((pad +
           SDPCM_HDRLEN) << SDPCM_DOFFSET_SHIFT) & SDPCM_DOFFSET_MASK);

    put_unaligned_le32(swheader, frame + SDPCM_FRAMETAG_LEN);
    put_unaligned_le32(0, frame + SDPCM_FRAMETAG_LEN + sizeof(swheader));

#ifdef DEBUG
    tx_packets[pkt->priority]++;
#endif

    brcmf_dbg_hex_dump(BRCMF_BYTES_ON() &&
               ((BRCMF_CTL_ON() && chan == SDPCM_CONTROL_CHANNEL) ||
                (BRCMF_DATA_ON() && chan != SDPCM_CONTROL_CHANNEL)),
               frame, len, "Tx Frame:\n");
    brcmf_dbg_hex_dump(!(BRCMF_BYTES_ON() &&
                 ((BRCMF_CTL_ON() &&
                   chan == SDPCM_CONTROL_CHANNEL) ||
                  (BRCMF_DATA_ON() &&
                   chan != SDPCM_CONTROL_CHANNEL))) &&
               BRCMF_HDRS_ON(),
               frame, min_t(u16, len, 16), "TxHdr:\n");

    /* Raise len to next SDIO block to eliminate tail command */
    if (bus->roundup && bus->blocksize && (len > bus->blocksize)) {
        u16 pad = bus->blocksize - (len % bus->blocksize);
        if ((pad <= bus->roundup) && (pad < bus->blocksize))
                len += pad;
    } else if (len % BRCMF_SDALIGN) {
        len += BRCMF_SDALIGN - (len % BRCMF_SDALIGN);
    }

    /* Some controllers have trouble with odd bytes -- round to even */
    if (len & (ALIGNMENT - 1))
            len = roundup(len, ALIGNMENT);

    ret = brcmf_sdcard_send_pkt(bus->sdiodev, bus->sdiodev->sbwad,
                    SDIO_FUNC_2, F2SYNC, pkt);
    bus->sdcnt.f2txdata++;

    if (ret < 0) {
        /* On failure, abort the command and terminate the frame */
        brcmf_dbg(INFO, "sdio error %d, abort command and terminate frame\n",
              ret);
        bus->sdcnt.tx_sderrs++;

        brcmf_sdcard_abort(bus->sdiodev, SDIO_FUNC_2);
        brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_FRAMECTRL,
                 SFC_WF_TERM, NULL);
        bus->sdcnt.f1regdata++;

        for (i = 0; i < 3; i++) {
            u8 hi, lo;
            hi = brcmf_sdio_regrb(bus->sdiodev,
                          SBSDIO_FUNC1_WFRAMEBCHI, NULL);
            lo = brcmf_sdio_regrb(bus->sdiodev,
                          SBSDIO_FUNC1_WFRAMEBCLO, NULL);
            bus->sdcnt.f1regdata += 2;
            if ((hi == 0) && (lo == 0))
                break;
        }

    }
    if (ret == 0)
        bus->tx_seq = (bus->tx_seq + 1) % SDPCM_SEQUENCE_WRAP;

done:
    /* restore pkt buffer pointer before calling tx complete routine */
    skb_pull(pkt, SDPCM_HDRLEN + pad);
    up(&bus->sdsem);
    brcmf_txcomplete(bus->sdiodev->dev, pkt, ret != 0);
    down(&bus->sdsem);

    if (free_pkt)
        brcmu_pkt_buf_free_skb(pkt);

    return ret;
}

static uint brcmf_sdbrcm_sendfromq(struct brcmf_sdio *bus, uint maxframes)
{
    struct sk_buff *pkt;
    u32 intstatus = 0;
    int ret = 0, prec_out;
    uint cnt = 0;
    uint datalen;
    u8 tx_prec_map;

    brcmf_dbg(TRACE, "Enter\n");

    tx_prec_map = ~bus->flowcontrol;

    /* Send frames until the limit or some other event */
    for (cnt = 0; (cnt < maxframes) && data_ok(bus); cnt++) {
        spin_lock_bh(&bus->txqlock);
        pkt = brcmu_pktq_mdeq(&bus->txq, tx_prec_map, &prec_out);
        if (pkt == NULL) {
            spin_unlock_bh(&bus->txqlock);
            break;
        }
        spin_unlock_bh(&bus->txqlock);
        datalen = pkt->len - SDPCM_HDRLEN;

        ret = brcmf_sdbrcm_txpkt(bus, pkt, SDPCM_DATA_CHANNEL, true);
        if (ret)
            bus->sdiodev->bus_if->dstats.tx_errors++;
        else
            bus->sdiodev->bus_if->dstats.tx_bytes += datalen;

        /* In poll mode, need to check for other events */
        if (!bus->intr && cnt) {
            /* Check device status, signal pending interrupt */
            ret = r_sdreg32(bus, &intstatus,
                    offsetof(struct sdpcmd_regs,
                         intstatus));
            bus->sdcnt.f2txdata++;
            if (ret != 0)
                break;
            if (intstatus & bus->hostintmask)
                atomic_set(&bus->ipend, 1);
        }
    }

    /* Deflow-control stack if needed */
    if (bus->sdiodev->bus_if->drvr_up &&
        (bus->sdiodev->bus_if->state == BRCMF_BUS_DATA) &&
        bus->txoff && (pktq_len(&bus->txq) < TXLOW)) {
        bus->txoff = false;
        brcmf_txflowblock(bus->sdiodev->dev, false);
    }

    return cnt;
}

static void brcmf_sdbrcm_bus_stop(struct device *dev)
{
    u32 local_hostintmask;
    u8 saveclk;
    int err;
    struct brcmf_bus *bus_if = dev_get_drvdata(dev);
    struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
    struct brcmf_sdio *bus = sdiodev->bus;

    brcmf_dbg(TRACE, "Enter\n");

    if (bus->watchdog_tsk) {
        send_sig(SIGTERM, bus->watchdog_tsk, 1);
        kthread_stop(bus->watchdog_tsk);
        bus->watchdog_tsk = NULL;
    }

    down(&bus->sdsem);

    /* Enable clock for device interrupts */
    brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);

    /* Disable and clear interrupts at the chip level also */
    w_sdreg32(bus, 0, offsetof(struct sdpcmd_regs, hostintmask));
    local_hostintmask = bus->hostintmask;
    bus->hostintmask = 0;

    /* Change our idea of bus state */
    bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;

    /* Force clocks on backplane to be sure F2 interrupt propagates */
    saveclk = brcmf_sdio_regrb(bus->sdiodev,
                   SBSDIO_FUNC1_CHIPCLKCSR, &err);
    if (!err) {
        brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
                 (saveclk | SBSDIO_FORCE_HT), &err);
    }
    if (err)
        brcmf_dbg(ERROR, "Failed to force clock for F2: err %d\n", err);

    /* Turn off the bus (F2), free any pending packets */
    brcmf_dbg(INTR, "disable SDIO interrupts\n");
    brcmf_sdio_regwb(bus->sdiodev, SDIO_CCCR_IOEx, SDIO_FUNC_ENABLE_1,
             NULL);

    /* Clear any pending interrupts now that F2 is disabled */
    w_sdreg32(bus, local_hostintmask,
          offsetof(struct sdpcmd_regs, intstatus));

    /* Turn off the backplane clock (only) */
    brcmf_sdbrcm_clkctl(bus, CLK_SDONLY, false);

    /* Clear the data packet queues */
    brcmu_pktq_flush(&bus->txq, true, NULL, NULL);

    /* Clear any held glomming stuff */
    if (bus->glomd)
        brcmu_pkt_buf_free_skb(bus->glomd);
    brcmf_sdbrcm_free_glom(bus);

    /* Clear rx control and wake any waiters */
    bus->rxlen = 0;
    brcmf_sdbrcm_dcmd_resp_wake(bus);

    /* Reset some F2 state stuff */
    bus->rxskip = false;
    bus->tx_seq = bus->rx_seq = 0;

    up(&bus->sdsem);
}

#ifdef CONFIG_BRCMFMAC_SDIO_OOB
static inline void brcmf_sdbrcm_clrintr(struct brcmf_sdio *bus)
{
    unsigned long flags;

    spin_lock_irqsave(&bus->sdiodev->irq_en_lock, flags);
    if (!bus->sdiodev->irq_en && !atomic_read(&bus->ipend)) {
        enable_irq(bus->sdiodev->irq);
        bus->sdiodev->irq_en = true;
    }
    spin_unlock_irqrestore(&bus->sdiodev->irq_en_lock, flags);
}
#else
static inline void brcmf_sdbrcm_clrintr(struct brcmf_sdio *bus)
{
}
#endif      /* CONFIG_BRCMFMAC_SDIO_OOB */

static inline void brcmf_sdbrcm_adddpctsk(struct brcmf_sdio *bus)
{
    struct list_head *new_hd;
    unsigned long flags;

    if (in_interrupt())
        new_hd = kzalloc(sizeof(struct list_head), GFP_ATOMIC);
    else
        new_hd = kzalloc(sizeof(struct list_head), GFP_KERNEL);
    if (new_hd == NULL)
        return;

    spin_lock_irqsave(&bus->dpc_tl_lock, flags);
    list_add_tail(new_hd, &bus->dpc_tsklst);
    spin_unlock_irqrestore(&bus->dpc_tl_lock, flags);
}

static int brcmf_sdio_intr_rstatus(struct brcmf_sdio *bus)
{
    u8 idx;
    u32 addr;
    unsigned long val;
    int n, ret;

    idx = brcmf_sdio_chip_getinfidx(bus->ci, BCMA_CORE_SDIO_DEV);
    addr = bus->ci->c_inf[idx].base +
           offsetof(struct sdpcmd_regs, intstatus);

    ret = brcmf_sdio_regrw_helper(bus->sdiodev, addr, &val, false);
    bus->sdcnt.f1regdata++;
    if (ret != 0)
        val = 0;

    val &= bus->hostintmask;
    atomic_set(&bus->fcstate, !!(val & I_HMB_FC_STATE));

    /* Clear interrupts */
    if (val) {
        ret = brcmf_sdio_regrw_helper(bus->sdiodev, addr, &val, true);
        bus->sdcnt.f1regdata++;
    }

    if (ret) {
        atomic_set(&bus->intstatus, 0);
    } else if (val) {
        for_each_set_bit(n, &val, 32)
            set_bit(n, (unsigned long *)&bus->intstatus.counter);
    }

    return ret;
}

static void brcmf_sdbrcm_dpc(struct brcmf_sdio *bus)
{
    u32 newstatus = 0;
    unsigned long intstatus;
    uint rxlimit = bus->rxbound;    /* Rx frames to read before resched */
    uint txlimit = bus->txbound;    /* Tx frames to send before resched */
    uint framecnt = 0;  /* Temporary counter of tx/rx frames */
    int err = 0, n;

    brcmf_dbg(TRACE, "Enter\n");

    down(&bus->sdsem);

    /* If waiting for HTAVAIL, check status */
    if (bus->clkstate == CLK_PENDING) {
        u8 clkctl, devctl = 0;

#ifdef DEBUG
        /* Check for inconsistent device control */
        devctl = brcmf_sdio_regrb(bus->sdiodev,
                      SBSDIO_DEVICE_CTL, &err);
        if (err) {
            brcmf_dbg(ERROR, "error reading DEVCTL: %d\n", err);
            bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
        }
#endif              /* DEBUG */

        /* Read CSR, if clock on switch to AVAIL, else ignore */
        clkctl = brcmf_sdio_regrb(bus->sdiodev,
                      SBSDIO_FUNC1_CHIPCLKCSR, &err);
        if (err) {
            brcmf_dbg(ERROR, "error reading CSR: %d\n",
                  err);
            bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
        }

        brcmf_dbg(INFO, "DPC: PENDING, devctl 0x%02x clkctl 0x%02x\n",
              devctl, clkctl);

        if (SBSDIO_HTAV(clkctl)) {
            devctl = brcmf_sdio_regrb(bus->sdiodev,
                          SBSDIO_DEVICE_CTL, &err);
            if (err) {
                brcmf_dbg(ERROR, "error reading DEVCTL: %d\n",
                      err);
                bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
            }
            devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
            brcmf_sdio_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
                     devctl, &err);
            if (err) {
                brcmf_dbg(ERROR, "error writing DEVCTL: %d\n",
                      err);
                bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
            }
            bus->clkstate = CLK_AVAIL;
        }
    }

    /* Make sure backplane clock is on */
    brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, true);

    /* Pending interrupt indicates new device status */
    if (atomic_read(&bus->ipend) > 0) {
        atomic_set(&bus->ipend, 0);
        sdio_claim_host(bus->sdiodev->func[1]);
        err = brcmf_sdio_intr_rstatus(bus);
        sdio_release_host(bus->sdiodev->func[1]);
    }

    /* Start with leftover status bits */
    intstatus = atomic_xchg(&bus->intstatus, 0);

    /* Handle flow-control change: read new state in case our ack
     * crossed another change interrupt.  If change still set, assume
     * FC ON for safety, let next loop through do the debounce.
     */
    if (intstatus & I_HMB_FC_CHANGE) {
        intstatus &= ~I_HMB_FC_CHANGE;
        err = w_sdreg32(bus, I_HMB_FC_CHANGE,
                offsetof(struct sdpcmd_regs, intstatus));

        err = r_sdreg32(bus, &newstatus,
                offsetof(struct sdpcmd_regs, intstatus));
        bus->sdcnt.f1regdata += 2;
        atomic_set(&bus->fcstate,
               !!(newstatus & (I_HMB_FC_STATE | I_HMB_FC_CHANGE)));
        intstatus |= (newstatus & bus->hostintmask);
    }

    /* Handle host mailbox indication */
    if (intstatus & I_HMB_HOST_INT) {
        intstatus &= ~I_HMB_HOST_INT;
        intstatus |= brcmf_sdbrcm_hostmail(bus);
    }

    /* Generally don't ask for these, can get CRC errors... */
    if (intstatus & I_WR_OOSYNC) {
        brcmf_dbg(ERROR, "Dongle reports WR_OOSYNC\n");
        intstatus &= ~I_WR_OOSYNC;
    }

    if (intstatus & I_RD_OOSYNC) {
        brcmf_dbg(ERROR, "Dongle reports RD_OOSYNC\n");
        intstatus &= ~I_RD_OOSYNC;
    }

    if (intstatus & I_SBINT) {
        brcmf_dbg(ERROR, "Dongle reports SBINT\n");
        intstatus &= ~I_SBINT;
    }

    /* Would be active due to wake-wlan in gSPI */
    if (intstatus & I_CHIPACTIVE) {
        brcmf_dbg(INFO, "Dongle reports CHIPACTIVE\n");
        intstatus &= ~I_CHIPACTIVE;
    }

    /* Ignore frame indications if rxskip is set */
    if (bus->rxskip)
        intstatus &= ~I_HMB_FRAME_IND;

    /* On frame indication, read available frames */
    if (PKT_AVAILABLE() && bus->clkstate == CLK_AVAIL) {
        framecnt = brcmf_sdio_readframes(bus, rxlimit);
        if (!bus->rxpending)
            intstatus &= ~I_HMB_FRAME_IND;
        rxlimit -= min(framecnt, rxlimit);
    }

    /* Keep still-pending events for next scheduling */
    if (intstatus) {
        for_each_set_bit(n, &intstatus, 32)
            set_bit(n, (unsigned long *)&bus->intstatus.counter);
    }

    brcmf_sdbrcm_clrintr(bus);

    if (data_ok(bus) && bus->ctrl_frame_stat &&
        (bus->clkstate == CLK_AVAIL)) {
        int i;

        err = brcmf_sdcard_send_buf(bus->sdiodev, bus->sdiodev->sbwad,
            SDIO_FUNC_2, F2SYNC, bus->ctrl_frame_buf,
            (u32) bus->ctrl_frame_len);

        if (err < 0) {
            /* On failure, abort the command and
                terminate the frame */
            brcmf_dbg(INFO, "sdio error %d, abort command and terminate frame\n",
                  err);
            bus->sdcnt.tx_sderrs++;

            brcmf_sdcard_abort(bus->sdiodev, SDIO_FUNC_2);

            brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_FRAMECTRL,
                     SFC_WF_TERM, &err);
            bus->sdcnt.f1regdata++;

            for (i = 0; i < 3; i++) {
                u8 hi, lo;
                hi = brcmf_sdio_regrb(bus->sdiodev,
                              SBSDIO_FUNC1_WFRAMEBCHI,
                              &err);
                lo = brcmf_sdio_regrb(bus->sdiodev,
                              SBSDIO_FUNC1_WFRAMEBCLO,
                              &err);
                bus->sdcnt.f1regdata += 2;
                if ((hi == 0) && (lo == 0))
                    break;
            }

        } else {
            bus->tx_seq = (bus->tx_seq + 1) % SDPCM_SEQUENCE_WRAP;
        }
        bus->ctrl_frame_stat = false;
        brcmf_sdbrcm_wait_event_wakeup(bus);
    }
    /* Send queued frames (limit 1 if rx may still be pending) */
    else if ((bus->clkstate == CLK_AVAIL) && !atomic_read(&bus->fcstate) &&
         brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol) && txlimit
         && data_ok(bus)) {
        framecnt = bus->rxpending ? min(txlimit, bus->txminmax) :
                        txlimit;
        framecnt = brcmf_sdbrcm_sendfromq(bus, framecnt);
        txlimit -= framecnt;
    }

    if ((bus->sdiodev->bus_if->state == BRCMF_BUS_DOWN) || (err != 0)) {
        brcmf_dbg(ERROR, "failed backplane access over SDIO, halting operation\n");
        bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
        atomic_set(&bus->intstatus, 0);
    } else if (atomic_read(&bus->intstatus) ||
           atomic_read(&bus->ipend) > 0 ||
           (!atomic_read(&bus->fcstate) &&
            brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol) &&
            data_ok(bus)) || PKT_AVAILABLE()) {
        brcmf_sdbrcm_adddpctsk(bus);
    }

    /* If we're done for now, turn off clock request. */
    if ((bus->clkstate != CLK_PENDING)
        && bus->idletime == BRCMF_IDLE_IMMEDIATE) {
        bus->activity = false;
        brcmf_sdbrcm_clkctl(bus, CLK_NONE, false);
    }

    up(&bus->sdsem);
}

static int brcmf_sdbrcm_bus_txdata(struct device *dev, struct sk_buff *pkt)
{
    int ret = -EBADE;
    uint datalen, prec;
    struct brcmf_bus *bus_if = dev_get_drvdata(dev);
    struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
    struct brcmf_sdio *bus = sdiodev->bus;
    unsigned long flags;

    brcmf_dbg(TRACE, "Enter\n");

    datalen = pkt->len;

    /* Add space for the header */
    skb_push(pkt, SDPCM_HDRLEN);
    /* precondition: IS_ALIGNED((unsigned long)(pkt->data), 2) */

    prec = prio2prec((pkt->priority & PRIOMASK));

    /* Check for existing queue, current flow-control,
             pending event, or pending clock */
    brcmf_dbg(TRACE, "deferring pktq len %d\n", pktq_len(&bus->txq));
    bus->sdcnt.fcqueued++;

    /* Priority based enq */
    spin_lock_bh(&bus->txqlock);
    if (!brcmf_c_prec_enq(bus->sdiodev->dev, &bus->txq, pkt, prec)) {
        skb_pull(pkt, SDPCM_HDRLEN);
        brcmf_txcomplete(bus->sdiodev->dev, pkt, false);
        brcmu_pkt_buf_free_skb(pkt);
        brcmf_dbg(ERROR, "out of bus->txq !!!\n");
        ret = -ENOSR;
    } else {
        ret = 0;
    }
    spin_unlock_bh(&bus->txqlock);

    if (pktq_len(&bus->txq) >= TXHI) {
        bus->txoff = true;
        brcmf_txflowblock(bus->sdiodev->dev, true);
    }

#ifdef DEBUG
    if (pktq_plen(&bus->txq, prec) > qcount[prec])
        qcount[prec] = pktq_plen(&bus->txq, prec);
#endif

    spin_lock_irqsave(&bus->dpc_tl_lock, flags);
    if (list_empty(&bus->dpc_tsklst)) {
        spin_unlock_irqrestore(&bus->dpc_tl_lock, flags);

        brcmf_sdbrcm_adddpctsk(bus);
        queue_work(bus->brcmf_wq, &bus->datawork);
    } else {
        spin_unlock_irqrestore(&bus->dpc_tl_lock, flags);
    }

    return ret;
}

static int
brcmf_sdbrcm_membytes(struct brcmf_sdio *bus, bool write, u32 address, u8 *data,
         uint size)
{
    int bcmerror = 0;
    u32 sdaddr;
    uint dsize;

    /* Determine initial transfer parameters */
    sdaddr = address & SBSDIO_SB_OFT_ADDR_MASK;
    if ((sdaddr + size) & SBSDIO_SBWINDOW_MASK)
        dsize = (SBSDIO_SB_OFT_ADDR_LIMIT - sdaddr);
    else
        dsize = size;

    sdio_claim_host(bus->sdiodev->func[1]);

    /* Set the backplane window to include the start address */
    bcmerror = brcmf_sdcard_set_sbaddr_window(bus->sdiodev, address);
    if (bcmerror) {
        brcmf_dbg(ERROR, "window change failed\n");
        goto xfer_done;
    }

    /* Do the transfer(s) */
    while (size) {
        brcmf_dbg(INFO, "%s %d bytes at offset 0x%08x in window 0x%08x\n",
              write ? "write" : "read", dsize,
              sdaddr, address & SBSDIO_SBWINDOW_MASK);
        bcmerror = brcmf_sdcard_rwdata(bus->sdiodev, write,
                           sdaddr, data, dsize);
        if (bcmerror) {
            brcmf_dbg(ERROR, "membytes transfer failed\n");
            break;
        }

        /* Adjust for next transfer (if any) */
        size -= dsize;
        if (size) {
            data += dsize;
            address += dsize;
            bcmerror = brcmf_sdcard_set_sbaddr_window(bus->sdiodev,
                                  address);
            if (bcmerror) {
                brcmf_dbg(ERROR, "window change failed\n");
                break;
            }
            sdaddr = 0;
            dsize = min_t(uint, SBSDIO_SB_OFT_ADDR_LIMIT, size);
        }
    }

xfer_done:
    /* Return the window to backplane enumeration space for core access */
    if (brcmf_sdcard_set_sbaddr_window(bus->sdiodev, bus->sdiodev->sbwad))
        brcmf_dbg(ERROR, "FAILED to set window back to 0x%x\n",
              bus->sdiodev->sbwad);

    sdio_release_host(bus->sdiodev->func[1]);

    return bcmerror;
}

#ifdef DEBUG
#define CONSOLE_LINE_MAX    192

static int brcmf_sdbrcm_readconsole(struct brcmf_sdio *bus)
{
    struct brcmf_console *c = &bus->console;
    u8 line[CONSOLE_LINE_MAX], ch;
    u32 n, idx, addr;
    int rv;

    /* Don't do anything until FWREADY updates console address */
    if (bus->console_addr == 0)
        return 0;

    /* Read console log struct */
    addr = bus->console_addr + offsetof(struct rte_console, log_le);
    rv = brcmf_sdbrcm_membytes(bus, false, addr, (u8 *)&c->log_le,
                   sizeof(c->log_le));
    if (rv < 0)
        return rv;

    /* Allocate console buffer (one time only) */
    if (c->buf == NULL) {
        c->bufsize = le32_to_cpu(c->log_le.buf_size);
        c->buf = kmalloc(c->bufsize, GFP_ATOMIC);
        if (c->buf == NULL)
            return -ENOMEM;
    }

    idx = le32_to_cpu(c->log_le.idx);

    /* Protect against corrupt value */
    if (idx > c->bufsize)
        return -EBADE;

    /* Skip reading the console buffer if the index pointer
     has not moved */
    if (idx == c->last)
        return 0;

    /* Read the console buffer */
    addr = le32_to_cpu(c->log_le.buf);
    rv = brcmf_sdbrcm_membytes(bus, false, addr, c->buf, c->bufsize);
    if (rv < 0)
        return rv;

    while (c->last != idx) {
        for (n = 0; n < CONSOLE_LINE_MAX - 2; n++) {
            if (c->last == idx) {
                /* This would output a partial line.
                 * Instead, back up
                 * the buffer pointer and output this
                 * line next time around.
                 */
                if (c->last >= n)
                    c->last -= n;
                else
                    c->last = c->bufsize - n;
                goto break2;
            }
            ch = c->buf[c->last];
            c->last = (c->last + 1) % c->bufsize;
            if (ch == '\n')
                break;
            line[n] = ch;
        }

        if (n > 0) {
            if (line[n - 1] == '\r')
                n--;
            line[n] = 0;
            pr_debug("CONSOLE: %s\n", line);
        }
    }
break2:

    return 0;
}
#endif              /* DEBUG */

static int brcmf_tx_frame(struct brcmf_sdio *bus, u8 *frame, u16 len)
{
    int i;
    int ret;

    bus->ctrl_frame_stat = false;
    ret = brcmf_sdcard_send_buf(bus->sdiodev, bus->sdiodev->sbwad,
                    SDIO_FUNC_2, F2SYNC, frame, len);

    if (ret < 0) {
        /* On failure, abort the command and terminate the frame */
        brcmf_dbg(INFO, "sdio error %d, abort command and terminate frame\n",
              ret);
        bus->sdcnt.tx_sderrs++;

        brcmf_sdcard_abort(bus->sdiodev, SDIO_FUNC_2);

        brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_FRAMECTRL,
                 SFC_WF_TERM, NULL);
        bus->sdcnt.f1regdata++;

        for (i = 0; i < 3; i++) {
            u8 hi, lo;
            hi = brcmf_sdio_regrb(bus->sdiodev,
                          SBSDIO_FUNC1_WFRAMEBCHI, NULL);
            lo = brcmf_sdio_regrb(bus->sdiodev,
                          SBSDIO_FUNC1_WFRAMEBCLO, NULL);
            bus->sdcnt.f1regdata += 2;
            if (hi == 0 && lo == 0)
                break;
        }
        return ret;
    }

    bus->tx_seq = (bus->tx_seq + 1) % SDPCM_SEQUENCE_WRAP;

    return ret;
}

static int
brcmf_sdbrcm_bus_txctl(struct device *dev, unsigned char *msg, uint msglen)
{
    u8 *frame;
    u16 len;
    u32 swheader;
    uint retries = 0;
    u8 doff = 0;
    int ret = -1;
    struct brcmf_bus *bus_if = dev_get_drvdata(dev);
    struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
    struct brcmf_sdio *bus = sdiodev->bus;
    unsigned long flags;

    brcmf_dbg(TRACE, "Enter\n");

    /* Back the pointer to make a room for bus header */
    frame = msg - SDPCM_HDRLEN;
    len = (msglen += SDPCM_HDRLEN);

    /* Add alignment padding (optional for ctl frames) */
    doff = ((unsigned long)frame % BRCMF_SDALIGN);
    if (doff) {
        frame -= doff;
        len += doff;
        msglen += doff;
        memset(frame, 0, doff + SDPCM_HDRLEN);
    }
    /* precondition: doff < BRCMF_SDALIGN */
    doff += SDPCM_HDRLEN;

    /* Round send length to next SDIO block */
    if (bus->roundup && bus->blocksize && (len > bus->blocksize)) {
        u16 pad = bus->blocksize - (len % bus->blocksize);
        if ((pad <= bus->roundup) && (pad < bus->blocksize))
            len += pad;
    } else if (len % BRCMF_SDALIGN) {
        len += BRCMF_SDALIGN - (len % BRCMF_SDALIGN);
    }

    /* Satisfy length-alignment requirements */
    if (len & (ALIGNMENT - 1))
        len = roundup(len, ALIGNMENT);

    /* precondition: IS_ALIGNED((unsigned long)frame, 2) */

    /* Need to lock here to protect txseq and SDIO tx calls */
    down(&bus->sdsem);

    /* Make sure backplane clock is on */
    brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);

    /* Hardware tag: 2 byte len followed by 2 byte ~len check (all LE) */
    *(__le16 *) frame = cpu_to_le16((u16) msglen);
    *(((__le16 *) frame) + 1) = cpu_to_le16(~msglen);

    /* Software tag: channel, sequence number, data offset */
    swheader =
        ((SDPCM_CONTROL_CHANNEL << SDPCM_CHANNEL_SHIFT) &
         SDPCM_CHANNEL_MASK)
        | bus->tx_seq | ((doff << SDPCM_DOFFSET_SHIFT) &
                 SDPCM_DOFFSET_MASK);
    put_unaligned_le32(swheader, frame + SDPCM_FRAMETAG_LEN);
    put_unaligned_le32(0, frame + SDPCM_FRAMETAG_LEN + sizeof(swheader));

    if (!data_ok(bus)) {
        brcmf_dbg(INFO, "No bus credit bus->tx_max %d, bus->tx_seq %d\n",
              bus->tx_max, bus->tx_seq);
        bus->ctrl_frame_stat = true;
        /* Send from dpc */
        bus->ctrl_frame_buf = frame;
        bus->ctrl_frame_len = len;

        brcmf_sdbrcm_wait_for_event(bus, &bus->ctrl_frame_stat);

        if (!bus->ctrl_frame_stat) {
            brcmf_dbg(INFO, "ctrl_frame_stat == false\n");
            ret = 0;
        } else {
            brcmf_dbg(INFO, "ctrl_frame_stat == true\n");
            ret = -1;
        }
    }

    if (ret == -1) {
        brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_CTL_ON(),
                   frame, len, "Tx Frame:\n");
        brcmf_dbg_hex_dump(!(BRCMF_BYTES_ON() && BRCMF_CTL_ON()) &&
                   BRCMF_HDRS_ON(),
                   frame, min_t(u16, len, 16), "TxHdr:\n");

        do {
            ret = brcmf_tx_frame(bus, frame, len);
        } while (ret < 0 && retries++ < TXRETRIES);
    }

    spin_lock_irqsave(&bus->dpc_tl_lock, flags);
    if ((bus->idletime == BRCMF_IDLE_IMMEDIATE) &&
        list_empty(&bus->dpc_tsklst)) {
        spin_unlock_irqrestore(&bus->dpc_tl_lock, flags);

        bus->activity = false;
        brcmf_sdbrcm_clkctl(bus, CLK_NONE, true);
    } else {
        spin_unlock_irqrestore(&bus->dpc_tl_lock, flags);
    }

    up(&bus->sdsem);

    if (ret)
        bus->sdcnt.tx_ctlerrs++;
    else
        bus->sdcnt.tx_ctlpkts++;

    return ret ? -EIO : 0;
}

#ifdef DEBUG
static inline bool brcmf_sdio_valid_shared_address(u32 addr)
{
    return !(addr == 0 || ((~addr >> 16) & 0xffff) == (addr & 0xffff));
}

static int brcmf_sdio_readshared(struct brcmf_sdio *bus,
                 struct sdpcm_shared *sh)
{
    u32 addr;
    int rv;
    u32 shaddr = 0;
    struct sdpcm_shared_le sh_le;
    __le32 addr_le;

    shaddr = bus->ramsize - 4;

    /*
     * Read last word in socram to determine
     * address of sdpcm_shared structure
     */
    rv = brcmf_sdbrcm_membytes(bus, false, shaddr,
                   (u8 *)&addr_le, 4);
    if (rv < 0)
        return rv;

    addr = le32_to_cpu(addr_le);

    brcmf_dbg(INFO, "sdpcm_shared address 0x%08X\n", addr);

    /*
     * Check if addr is valid.
     * NVRAM length at the end of memory should have been overwritten.
     */
    if (!brcmf_sdio_valid_shared_address(addr)) {
            brcmf_dbg(ERROR, "invalid sdpcm_shared address 0x%08X\n",
                  addr);
            return -EINVAL;
    }

    /* Read hndrte_shared structure */
    rv = brcmf_sdbrcm_membytes(bus, false, addr, (u8 *)&sh_le,
                   sizeof(struct sdpcm_shared_le));
    if (rv < 0)
        return rv;

    /* Endianness */
    sh->flags = le32_to_cpu(sh_le.flags);
    sh->trap_addr = le32_to_cpu(sh_le.trap_addr);
    sh->assert_exp_addr = le32_to_cpu(sh_le.assert_exp_addr);
    sh->assert_file_addr = le32_to_cpu(sh_le.assert_file_addr);
    sh->assert_line = le32_to_cpu(sh_le.assert_line);
    sh->console_addr = le32_to_cpu(sh_le.console_addr);
    sh->msgtrace_addr = le32_to_cpu(sh_le.msgtrace_addr);

    if ((sh->flags & SDPCM_SHARED_VERSION_MASK) != SDPCM_SHARED_VERSION) {
        brcmf_dbg(ERROR,
              "sdpcm_shared version mismatch: dhd %d dongle %d\n",
              SDPCM_SHARED_VERSION,
              sh->flags & SDPCM_SHARED_VERSION_MASK);
        return -EPROTO;
    }

    return 0;
}

static int brcmf_sdio_dump_console(struct brcmf_sdio *bus,
                   struct sdpcm_shared *sh, char __user *data,
                   size_t count)
{
    u32 addr, console_ptr, console_size, console_index;
    char *conbuf = NULL;
    __le32 sh_val;
    int rv;
    loff_t pos = 0;
    int nbytes = 0;

    /* obtain console information from device memory */
    addr = sh->console_addr + offsetof(struct rte_console, log_le);
    rv = brcmf_sdbrcm_membytes(bus, false, addr,
            (u8 *)&sh_val, sizeof(u32));
    if (rv < 0)
        return rv;
    console_ptr = le32_to_cpu(sh_val);

    addr = sh->console_addr + offsetof(struct rte_console, log_le.buf_size);
    rv = brcmf_sdbrcm_membytes(bus, false, addr,
            (u8 *)&sh_val, sizeof(u32));
    if (rv < 0)
        return rv;
    console_size = le32_to_cpu(sh_val);

    addr = sh->console_addr + offsetof(struct rte_console, log_le.idx);
    rv = brcmf_sdbrcm_membytes(bus, false, addr,
            (u8 *)&sh_val, sizeof(u32));
    if (rv < 0)
        return rv;
    console_index = le32_to_cpu(sh_val);

    /* allocate buffer for console data */
    if (console_size <= CONSOLE_BUFFER_MAX)
        conbuf = vzalloc(console_size+1);

    if (!conbuf)
        return -ENOMEM;

    /* obtain the console data from device */
    conbuf[console_size] = '\0';
    rv = brcmf_sdbrcm_membytes(bus, false, console_ptr, (u8 *)conbuf,
                   console_size);
    if (rv < 0)
        goto done;

    rv = simple_read_from_buffer(data, count, &pos,
                     conbuf + console_index,
                     console_size - console_index);
    if (rv < 0)
        goto done;

    nbytes = rv;
    if (console_index > 0) {
        pos = 0;
        rv = simple_read_from_buffer(data+nbytes, count, &pos,
                         conbuf, console_index - 1);
        if (rv < 0)
            goto done;
        rv += nbytes;
    }
done:
    vfree(conbuf);
    return rv;
}

static int brcmf_sdio_trap_info(struct brcmf_sdio *bus, struct sdpcm_shared *sh,
                char __user *data, size_t count)
{
    int error, res;
    char buf[350];
    struct brcmf_trap_info tr;
    int nbytes;
    loff_t pos = 0;

    if ((sh->flags & SDPCM_SHARED_TRAP) == 0)
        return 0;

    error = brcmf_sdbrcm_membytes(bus, false, sh->trap_addr, (u8 *)&tr,
                      sizeof(struct brcmf_trap_info));
    if (error < 0)
        return error;

    nbytes = brcmf_sdio_dump_console(bus, sh, data, count);
    if (nbytes < 0)
        return nbytes;

    res = scnprintf(buf, sizeof(buf),
            "dongle trap info: type 0x%x @ epc 0x%08x\n"
            "  cpsr 0x%08x spsr 0x%08x sp 0x%08x\n"
            "  lr   0x%08x pc   0x%08x offset 0x%x\n"
            "  r0   0x%08x r1   0x%08x r2 0x%08x r3 0x%08x\n"
            "  r4   0x%08x r5   0x%08x r6 0x%08x r7 0x%08x\n",
            le32_to_cpu(tr.type), le32_to_cpu(tr.epc),
            le32_to_cpu(tr.cpsr), le32_to_cpu(tr.spsr),
            le32_to_cpu(tr.r13), le32_to_cpu(tr.r14),
            le32_to_cpu(tr.pc), sh->trap_addr,
            le32_to_cpu(tr.r0), le32_to_cpu(tr.r1),
            le32_to_cpu(tr.r2), le32_to_cpu(tr.r3),
            le32_to_cpu(tr.r4), le32_to_cpu(tr.r5),
            le32_to_cpu(tr.r6), le32_to_cpu(tr.r7));

    error = simple_read_from_buffer(data+nbytes, count, &pos, buf, res);
    if (error < 0)
        return error;

    nbytes += error;
    return nbytes;
}

static int brcmf_sdio_assert_info(struct brcmf_sdio *bus,
                  struct sdpcm_shared *sh, char __user *data,
                  size_t count)
{
    int error = 0;
    char buf[200];
    char file[80] = "?";
    char expr[80] = "<???>";
    int res;
    loff_t pos = 0;

    if ((sh->flags & SDPCM_SHARED_ASSERT_BUILT) == 0) {
        brcmf_dbg(INFO, "firmware not built with -assert\n");
        return 0;
    } else if ((sh->flags & SDPCM_SHARED_ASSERT) == 0) {
        brcmf_dbg(INFO, "no assert in dongle\n");
        return 0;
    }

    if (sh->assert_file_addr != 0) {
        error = brcmf_sdbrcm_membytes(bus, false, sh->assert_file_addr,
                          (u8 *)file, 80);
        if (error < 0)
            return error;
    }
    if (sh->assert_exp_addr != 0) {
        error = brcmf_sdbrcm_membytes(bus, false, sh->assert_exp_addr,
                          (u8 *)expr, 80);
        if (error < 0)
            return error;
    }

    res = scnprintf(buf, sizeof(buf),
            "dongle assert: %s:%d: assert(%s)\n",
            file, sh->assert_line, expr);
    return simple_read_from_buffer(data, count, &pos, buf, res);
}

static int brcmf_sdbrcm_checkdied(struct brcmf_sdio *bus)
{
    int error;
    struct sdpcm_shared sh;

    down(&bus->sdsem);
    error = brcmf_sdio_readshared(bus, &sh);
    up(&bus->sdsem);

    if (error < 0)
        return error;

    if ((sh.flags & SDPCM_SHARED_ASSERT_BUILT) == 0)
        brcmf_dbg(INFO, "firmware not built with -assert\n");
    else if (sh.flags & SDPCM_SHARED_ASSERT)
        brcmf_dbg(ERROR, "assertion in dongle\n");

    if (sh.flags & SDPCM_SHARED_TRAP)
        brcmf_dbg(ERROR, "firmware trap in dongle\n");

    return 0;
}

static int brcmf_sdbrcm_died_dump(struct brcmf_sdio *bus, char __user *data,
                  size_t count, loff_t *ppos)
{
    int error = 0;
    struct sdpcm_shared sh;
    int nbytes = 0;
    loff_t pos = *ppos;

    if (pos != 0)
        return 0;

    down(&bus->sdsem);
    error = brcmf_sdio_readshared(bus, &sh);
    if (error < 0)
        goto done;

    error = brcmf_sdio_assert_info(bus, &sh, data, count);
    if (error < 0)
        goto done;

    nbytes = error;
    error = brcmf_sdio_trap_info(bus, &sh, data, count);
    if (error < 0)
        goto done;

    error += nbytes;
    *ppos += error;
done:
    up(&bus->sdsem);
    return error;
}

static ssize_t brcmf_sdio_forensic_read(struct file *f, char __user *data,
                    size_t count, loff_t *ppos)
{
    struct brcmf_sdio *bus = f->private_data;
    int res;

    res = brcmf_sdbrcm_died_dump(bus, data, count, ppos);
    if (res > 0)
        *ppos += res;
    return (ssize_t)res;
}

static const struct file_operations brcmf_sdio_forensic_ops = {
    .owner = THIS_MODULE,
    .open = simple_open,
    .read = brcmf_sdio_forensic_read
};

static void brcmf_sdio_debugfs_create(struct brcmf_sdio *bus)
{
    struct brcmf_pub *drvr = bus->sdiodev->bus_if->drvr;
    struct dentry *dentry = brcmf_debugfs_get_devdir(drvr);

    if (IS_ERR_OR_NULL(dentry))
        return;

    debugfs_create_file("forensics", S_IRUGO, dentry, bus,
                &brcmf_sdio_forensic_ops);
    brcmf_debugfs_create_sdio_count(drvr, &bus->sdcnt);
}
#else
static int brcmf_sdbrcm_checkdied(struct brcmf_sdio *bus)
{
    return 0;
}

static void brcmf_sdio_debugfs_create(struct brcmf_sdio *bus)
{
}
#endif /* DEBUG */

static int
brcmf_sdbrcm_bus_rxctl(struct device *dev, unsigned char *msg, uint msglen)
{
    int timeleft;
    uint rxlen = 0;
    bool pending;
    struct brcmf_bus *bus_if = dev_get_drvdata(dev);
    struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
    struct brcmf_sdio *bus = sdiodev->bus;

    brcmf_dbg(TRACE, "Enter\n");

    /* Wait until control frame is available */
    timeleft = brcmf_sdbrcm_dcmd_resp_wait(bus, &bus->rxlen, &pending);

    down(&bus->sdsem);
    rxlen = bus->rxlen;
    memcpy(msg, bus->rxctl, min(msglen, rxlen));
    bus->rxlen = 0;
    up(&bus->sdsem);

    if (rxlen) {
        brcmf_dbg(CTL, "resumed on rxctl frame, got %d expected %d\n",
              rxlen, msglen);
    } else if (timeleft == 0) {
        brcmf_dbg(ERROR, "resumed on timeout\n");
        brcmf_sdbrcm_checkdied(bus);
    } else if (pending) {
        brcmf_dbg(CTL, "cancelled\n");
        return -ERESTARTSYS;
    } else {
        brcmf_dbg(CTL, "resumed for unknown reason?\n");
        brcmf_sdbrcm_checkdied(bus);
    }

    if (rxlen)
        bus->sdcnt.rx_ctlpkts++;
    else
        bus->sdcnt.rx_ctlerrs++;

    return rxlen ? (int)rxlen : -ETIMEDOUT;
}

static int brcmf_sdbrcm_write_vars(struct brcmf_sdio *bus)
{
    int bcmerror = 0;
    u32 varaddr;
    u32 varsizew;
    __le32 varsizew_le;
#ifdef DEBUG
    char *nvram_ularray;
#endif              /* DEBUG */

    /* Even if there are no vars are to be written, we still
         need to set the ramsize. */
    varaddr = (bus->ramsize - 4) - bus->varsz;

    if (bus->vars) {
        /* Write the vars list */
        bcmerror = brcmf_sdbrcm_membytes(bus, true, varaddr,
                         bus->vars, bus->varsz);
#ifdef DEBUG
        /* Verify NVRAM bytes */
        brcmf_dbg(INFO, "Compare NVRAM dl & ul; varsize=%d\n",
              bus->varsz);
        nvram_ularray = kmalloc(bus->varsz, GFP_ATOMIC);
        if (!nvram_ularray)
            return -ENOMEM;

        /* Upload image to verify downloaded contents. */
        memset(nvram_ularray, 0xaa, bus->varsz);

        /* Read the vars list to temp buffer for comparison */
        bcmerror = brcmf_sdbrcm_membytes(bus, false, varaddr,
                         nvram_ularray, bus->varsz);
        if (bcmerror) {
            brcmf_dbg(ERROR, "error %d on reading %d nvram bytes at 0x%08x\n",
                  bcmerror, bus->varsz, varaddr);
        }
        /* Compare the org NVRAM with the one read from RAM */
        if (memcmp(bus->vars, nvram_ularray, bus->varsz))
            brcmf_dbg(ERROR, "Downloaded NVRAM image is corrupted\n");
        else
            brcmf_dbg(ERROR, "Download/Upload/Compare of NVRAM ok\n");

        kfree(nvram_ularray);
#endif              /* DEBUG */
    }

    /* adjust to the user specified RAM */
    brcmf_dbg(INFO, "Physical memory size: %d\n", bus->ramsize);
    brcmf_dbg(INFO, "Vars are at %d, orig varsize is %d\n",
          varaddr, bus->varsz);

    /*
     * Determine the length token:
     * Varsize, converted to words, in lower 16-bits, checksum
     * in upper 16-bits.
     */
    if (bcmerror) {
        varsizew = 0;
        varsizew_le = cpu_to_le32(0);
    } else {
        varsizew = bus->varsz / 4;
        varsizew = (~varsizew << 16) | (varsizew & 0x0000FFFF);
        varsizew_le = cpu_to_le32(varsizew);
    }

    brcmf_dbg(INFO, "New varsize is %d, length token=0x%08x\n",
          bus->varsz, varsizew);

    /* Write the length token to the last word */
    bcmerror = brcmf_sdbrcm_membytes(bus, true, (bus->ramsize - 4),
                     (u8 *)&varsizew_le, 4);

    return bcmerror;
}

static int brcmf_sdbrcm_download_state(struct brcmf_sdio *bus, bool enter)
{
    int bcmerror = 0;
    struct chip_info *ci = bus->ci;

    /* To enter download state, disable ARM and reset SOCRAM.
     * To exit download state, simply reset ARM (default is RAM boot).
     */
    if (enter) {
        bus->alp_only = true;

        ci->coredisable(bus->sdiodev, ci, BCMA_CORE_ARM_CM3);

        ci->resetcore(bus->sdiodev, ci, BCMA_CORE_INTERNAL_MEM);

        /* Clear the top bit of memory */
        if (bus->ramsize) {
            u32 zeros = 0;
            brcmf_sdbrcm_membytes(bus, true, bus->ramsize - 4,
                     (u8 *)&zeros, 4);
        }
    } else {
        if (!ci->iscoreup(bus->sdiodev, ci, BCMA_CORE_INTERNAL_MEM)) {
            brcmf_dbg(ERROR, "SOCRAM core is down after reset?\n");
            bcmerror = -EBADE;
            goto fail;
        }

        bcmerror = brcmf_sdbrcm_write_vars(bus);
        if (bcmerror) {
            brcmf_dbg(ERROR, "no vars written to RAM\n");
            bcmerror = 0;
        }

        w_sdreg32(bus, 0xFFFFFFFF,
              offsetof(struct sdpcmd_regs, intstatus));

        ci->resetcore(bus->sdiodev, ci, BCMA_CORE_ARM_CM3);

        /* Allow HT Clock now that the ARM is running. */
        bus->alp_only = false;

        bus->sdiodev->bus_if->state = BRCMF_BUS_LOAD;
    }
fail:
    return bcmerror;
}

static int brcmf_sdbrcm_get_image(char *buf, int len, struct brcmf_sdio *bus)
{
    if (bus->firmware->size < bus->fw_ptr + len)
        len = bus->firmware->size - bus->fw_ptr;

    memcpy(buf, &bus->firmware->data[bus->fw_ptr], len);
    bus->fw_ptr += len;
    return len;
}

static int brcmf_sdbrcm_download_code_file(struct brcmf_sdio *bus)
{
    int offset = 0;
    uint len;
    u8 *memblock = NULL, *memptr;
    int ret;

    brcmf_dbg(INFO, "Enter\n");

    ret = request_firmware(&bus->firmware, BRCMF_SDIO_FW_NAME,
                   &bus->sdiodev->func[2]->dev);
    if (ret) {
        brcmf_dbg(ERROR, "Fail to request firmware %d\n", ret);
        return ret;
    }
    bus->fw_ptr = 0;

    memptr = memblock = kmalloc(MEMBLOCK + BRCMF_SDALIGN, GFP_ATOMIC);
    if (memblock == NULL) {
        ret = -ENOMEM;
        goto err;
    }
    if ((u32)(unsigned long)memblock % BRCMF_SDALIGN)
        memptr += (BRCMF_SDALIGN -
               ((u32)(unsigned long)memblock % BRCMF_SDALIGN));

    /* Download image */
    while ((len =
        brcmf_sdbrcm_get_image((char *)memptr, MEMBLOCK, bus))) {
        ret = brcmf_sdbrcm_membytes(bus, true, offset, memptr, len);
        if (ret) {
            brcmf_dbg(ERROR, "error %d on writing %d membytes at 0x%08x\n",
                  ret, MEMBLOCK, offset);
            goto err;
        }

        offset += MEMBLOCK;
    }

err:
    kfree(memblock);

    release_firmware(bus->firmware);
    bus->fw_ptr = 0;

    return ret;
}

/*
 * ProcessVars:Takes a buffer of "<var>=<value>\n" lines read from a file
 * and ending in a NUL.
 * Removes carriage returns, empty lines, comment lines, and converts
 * newlines to NULs.
 * Shortens buffer as needed and pads with NULs.  End of buffer is marked
 * by two NULs.
*/

static int brcmf_process_nvram_vars(struct brcmf_sdio *bus)
{
    char *varbuf;
    char *dp;
    bool findNewline;
    int column;
    int ret = 0;
    uint buf_len, n, len;

    len = bus->firmware->size;
    varbuf = vmalloc(len);
    if (!varbuf)
        return -ENOMEM;

    memcpy(varbuf, bus->firmware->data, len);
    dp = varbuf;

    findNewline = false;
    column = 0;

    for (n = 0; n < len; n++) {
        if (varbuf[n] == 0)
            break;
        if (varbuf[n] == '\r')
            continue;
        if (findNewline && varbuf[n] != '\n')
            continue;
        findNewline = false;
        if (varbuf[n] == '#') {
            findNewline = true;
            continue;
        }
        if (varbuf[n] == '\n') {
            if (column == 0)
                continue;
            *dp++ = 0;
            column = 0;
            continue;
        }
        *dp++ = varbuf[n];
        column++;
    }
    buf_len = dp - varbuf;
    while (dp < varbuf + n)
        *dp++ = 0;

    kfree(bus->vars);
    /* roundup needed for download to device */
    bus->varsz = roundup(buf_len + 1, 4);
    bus->vars = kmalloc(bus->varsz, GFP_KERNEL);
    if (bus->vars == NULL) {
        bus->varsz = 0;
        ret = -ENOMEM;
        goto err;
    }

    /* copy the processed variables and add null termination */
    memcpy(bus->vars, varbuf, buf_len);
    bus->vars[buf_len] = 0;
err:
    vfree(varbuf);
    return ret;
}

static int brcmf_sdbrcm_download_nvram(struct brcmf_sdio *bus)
{
    int ret;

    if (bus->sdiodev->bus_if->drvr_up)
        return -EISCONN;

    ret = request_firmware(&bus->firmware, BRCMF_SDIO_NV_NAME,
                   &bus->sdiodev->func[2]->dev);
    if (ret) {
        brcmf_dbg(ERROR, "Fail to request nvram %d\n", ret);
        return ret;
    }

    ret = brcmf_process_nvram_vars(bus);

    release_firmware(bus->firmware);

    return ret;
}

static int _brcmf_sdbrcm_download_firmware(struct brcmf_sdio *bus)
{
    int bcmerror = -1;

    /* Keep arm in reset */
    if (brcmf_sdbrcm_download_state(bus, true)) {
        brcmf_dbg(ERROR, "error placing ARM core in reset\n");
        goto err;
    }

    /* External image takes precedence if specified */
    if (brcmf_sdbrcm_download_code_file(bus)) {
        brcmf_dbg(ERROR, "dongle image file download failed\n");
        goto err;
    }

    /* External nvram takes precedence if specified */
    if (brcmf_sdbrcm_download_nvram(bus))
        brcmf_dbg(ERROR, "dongle nvram file download failed\n");

    /* Take arm out of reset */
    if (brcmf_sdbrcm_download_state(bus, false)) {
        brcmf_dbg(ERROR, "error getting out of ARM core reset\n");
        goto err;
    }

    bcmerror = 0;

err:
    return bcmerror;
}

static bool
brcmf_sdbrcm_download_firmware(struct brcmf_sdio *bus)
{
    bool ret;

    /* Download the firmware */
    brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);

    ret = _brcmf_sdbrcm_download_firmware(bus) == 0;

    brcmf_sdbrcm_clkctl(bus, CLK_SDONLY, false);

    return ret;
}

static int brcmf_sdbrcm_bus_init(struct device *dev)
{
    struct brcmf_bus *bus_if = dev_get_drvdata(dev);
    struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
    struct brcmf_sdio *bus = sdiodev->bus;
    unsigned long timeout;
    u8 ready, enable;
    int err, ret = 0;
    u8 saveclk;

    brcmf_dbg(TRACE, "Enter\n");

    /* try to download image and nvram to the dongle */
    if (bus_if->state == BRCMF_BUS_DOWN) {
        if (!(brcmf_sdbrcm_download_firmware(bus)))
            return -1;
    }

    if (!bus->sdiodev->bus_if->drvr)
        return 0;

    /* Start the watchdog timer */
    bus->sdcnt.tickcnt = 0;
    brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);

    down(&bus->sdsem);

    /* Make sure backplane clock is on, needed to generate F2 interrupt */
    brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);
    if (bus->clkstate != CLK_AVAIL)
        goto exit;

    /* Force clocks on backplane to be sure F2 interrupt propagates */
    saveclk = brcmf_sdio_regrb(bus->sdiodev,
                   SBSDIO_FUNC1_CHIPCLKCSR, &err);
    if (!err) {
        brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
                 (saveclk | SBSDIO_FORCE_HT), &err);
    }
    if (err) {
        brcmf_dbg(ERROR, "Failed to force clock for F2: err %d\n", err);
        goto exit;
    }

    /* Enable function 2 (frame transfers) */
    w_sdreg32(bus, SDPCM_PROT_VERSION << SMB_DATA_VERSION_SHIFT,
          offsetof(struct sdpcmd_regs, tosbmailboxdata));
    enable = (SDIO_FUNC_ENABLE_1 | SDIO_FUNC_ENABLE_2);

    brcmf_sdio_regwb(bus->sdiodev, SDIO_CCCR_IOEx, enable, NULL);

    timeout = jiffies + msecs_to_jiffies(BRCMF_WAIT_F2RDY);
    ready = 0;
    while (enable != ready) {
        ready = brcmf_sdio_regrb(bus->sdiodev,
                     SDIO_CCCR_IORx, NULL);
        if (time_after(jiffies, timeout))
            break;
        else if (time_after(jiffies, timeout - BRCMF_WAIT_F2RDY + 50))
            /* prevent busy waiting if it takes too long */
            msleep_interruptible(20);
    }

    brcmf_dbg(INFO, "enable 0x%02x, ready 0x%02x\n", enable, ready);

    /* If F2 successfully enabled, set core and enable interrupts */
    if (ready == enable) {
        /* Set up the interrupt mask and enable interrupts */
        bus->hostintmask = HOSTINTMASK;
        w_sdreg32(bus, bus->hostintmask,
              offsetof(struct sdpcmd_regs, hostintmask));

        brcmf_sdio_regwb(bus->sdiodev, SBSDIO_WATERMARK, 8, &err);
    } else {
        /* Disable F2 again */
        enable = SDIO_FUNC_ENABLE_1;
        brcmf_sdio_regwb(bus->sdiodev, SDIO_CCCR_IOEx, enable, NULL);
        ret = -ENODEV;
    }

    /* Restore previous clock setting */
    brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR, saveclk, &err);

    if (ret == 0) {
        ret = brcmf_sdio_intr_register(bus->sdiodev);
        if (ret != 0)
            brcmf_dbg(ERROR, "intr register failed:%d\n", ret);
    }

    /* If we didn't come up, turn off backplane clock */
    if (bus_if->state != BRCMF_BUS_DATA)
        brcmf_sdbrcm_clkctl(bus, CLK_NONE, false);

exit:
    up(&bus->sdsem);

    return ret;
}

void brcmf_sdbrcm_isr(void *arg)
{
    struct brcmf_sdio *bus = (struct brcmf_sdio *) arg;

    brcmf_dbg(TRACE, "Enter\n");

    if (!bus) {
        brcmf_dbg(ERROR, "bus is null pointer, exiting\n");
        return;
    }

    if (bus->sdiodev->bus_if->state == BRCMF_BUS_DOWN) {
        brcmf_dbg(ERROR, "bus is down. we have nothing to do\n");
        return;
    }
    /* Count the interrupt call */
    bus->sdcnt.intrcount++;
    if (in_interrupt())
        atomic_set(&bus->ipend, 1);
    else
        if (brcmf_sdio_intr_rstatus(bus)) {
            brcmf_dbg(ERROR, "failed backplane access\n");
            bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
        }

    /* Disable additional interrupts (is this needed now)? */
    if (!bus->intr)
        brcmf_dbg(ERROR, "isr w/o interrupt configured!\n");

    brcmf_sdbrcm_adddpctsk(bus);
    queue_work(bus->brcmf_wq, &bus->datawork);
}

static bool brcmf_sdbrcm_bus_watchdog(struct brcmf_sdio *bus)
{
#ifdef DEBUG
    struct brcmf_bus *bus_if = dev_get_drvdata(bus->sdiodev->dev);
#endif  /* DEBUG */
    unsigned long flags;

    brcmf_dbg(TIMER, "Enter\n");

    down(&bus->sdsem);

    /* Poll period: check device if appropriate. */
    if (bus->poll && (++bus->polltick >= bus->pollrate)) {
        u32 intstatus = 0;

        /* Reset poll tick */
        bus->polltick = 0;

        /* Check device if no interrupts */
        if (!bus->intr ||
            (bus->sdcnt.intrcount == bus->sdcnt.lastintrs)) {

            spin_lock_irqsave(&bus->dpc_tl_lock, flags);
            if (list_empty(&bus->dpc_tsklst)) {
                u8 devpend;
                spin_unlock_irqrestore(&bus->dpc_tl_lock,
                               flags);
                devpend = brcmf_sdio_regrb(bus->sdiodev,
                               SDIO_CCCR_INTx,
                               NULL);
                intstatus =
                    devpend & (INTR_STATUS_FUNC1 |
                           INTR_STATUS_FUNC2);
            } else {
                spin_unlock_irqrestore(&bus->dpc_tl_lock,
                               flags);
            }

            /* If there is something, make like the ISR and
                 schedule the DPC */
            if (intstatus) {
                bus->sdcnt.pollcnt++;
                atomic_set(&bus->ipend, 1);

                brcmf_sdbrcm_adddpctsk(bus);
                queue_work(bus->brcmf_wq, &bus->datawork);
            }
        }

        /* Update interrupt tracking */
        bus->sdcnt.lastintrs = bus->sdcnt.intrcount;
    }
#ifdef DEBUG
    /* Poll for console output periodically */
    if (bus_if->state == BRCMF_BUS_DATA &&
        bus->console_interval != 0) {
        bus->console.count += BRCMF_WD_POLL_MS;
        if (bus->console.count >= bus->console_interval) {
            bus->console.count -= bus->console_interval;
            /* Make sure backplane clock is on */
            brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);
            if (brcmf_sdbrcm_readconsole(bus) < 0)
                /* stop on error */
                bus->console_interval = 0;
        }
    }
#endif              /* DEBUG */

    /* On idle timeout clear activity flag and/or turn off clock */
    if ((bus->idletime > 0) && (bus->clkstate == CLK_AVAIL)) {
        if (++bus->idlecount >= bus->idletime) {
            bus->idlecount = 0;
            if (bus->activity) {
                bus->activity = false;
                brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
            } else {
                brcmf_sdbrcm_clkctl(bus, CLK_NONE, false);
            }
        }
    }

    up(&bus->sdsem);

    return (atomic_read(&bus->ipend) > 0);
}

static bool brcmf_sdbrcm_chipmatch(u16 chipid)
{
    if (chipid == BCM43241_CHIP_ID)
        return true;
    if (chipid == BCM4329_CHIP_ID)
        return true;
    if (chipid == BCM4330_CHIP_ID)
        return true;
    if (chipid == BCM4334_CHIP_ID)
        return true;
    return false;
}

static void brcmf_sdio_dataworker(struct work_struct *work)
{
    struct brcmf_sdio *bus = container_of(work, struct brcmf_sdio,
                          datawork);
    struct list_head *cur_hd, *tmp_hd;
    unsigned long flags;

    spin_lock_irqsave(&bus->dpc_tl_lock, flags);
    list_for_each_safe(cur_hd, tmp_hd, &bus->dpc_tsklst) {
        spin_unlock_irqrestore(&bus->dpc_tl_lock, flags);

        brcmf_sdbrcm_dpc(bus);

        spin_lock_irqsave(&bus->dpc_tl_lock, flags);
        list_del(cur_hd);
        kfree(cur_hd);
    }
    spin_unlock_irqrestore(&bus->dpc_tl_lock, flags);
}

static void brcmf_sdbrcm_release_malloc(struct brcmf_sdio *bus)
{
    brcmf_dbg(TRACE, "Enter\n");

    kfree(bus->rxbuf);
    bus->rxctl = bus->rxbuf = NULL;
    bus->rxlen = 0;

    kfree(bus->databuf);
    bus->databuf = NULL;
}

static bool brcmf_sdbrcm_probe_malloc(struct brcmf_sdio *bus)
{
    brcmf_dbg(TRACE, "Enter\n");

    if (bus->sdiodev->bus_if->maxctl) {
        bus->rxblen =
            roundup((bus->sdiodev->bus_if->maxctl + SDPCM_HDRLEN),
                ALIGNMENT) + BRCMF_SDALIGN;
        bus->rxbuf = kmalloc(bus->rxblen, GFP_ATOMIC);
        if (!(bus->rxbuf))
            goto fail;
    }

    /* Allocate buffer to receive glomed packet */
    bus->databuf = kmalloc(MAX_DATA_BUF, GFP_ATOMIC);
    if (!(bus->databuf)) {
        /* release rxbuf which was already located as above */
        if (!bus->rxblen)
            kfree(bus->rxbuf);
        goto fail;
    }

    /* Align the buffer */
    if ((unsigned long)bus->databuf % BRCMF_SDALIGN)
        bus->dataptr = bus->databuf + (BRCMF_SDALIGN -
                   ((unsigned long)bus->databuf % BRCMF_SDALIGN));
    else
        bus->dataptr = bus->databuf;

    return true;

fail:
    return false;
}

static bool
brcmf_sdbrcm_probe_attach(struct brcmf_sdio *bus, u32 regsva)
{
    u8 clkctl = 0;
    int err = 0;
    int reg_addr;
    u32 reg_val;
    u8 idx;

    bus->alp_only = true;

    pr_debug("F1 signature read @0x18000000=0x%4x\n",
         brcmf_sdio_regrl(bus->sdiodev, SI_ENUM_BASE, NULL));

    /*
     * Force PLL off until brcmf_sdio_chip_attach()
     * programs PLL control regs
     */

    brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
             BRCMF_INIT_CLKCTL1, &err);
    if (!err)
        clkctl = brcmf_sdio_regrb(bus->sdiodev,
                      SBSDIO_FUNC1_CHIPCLKCSR, &err);

    if (err || ((clkctl & ~SBSDIO_AVBITS) != BRCMF_INIT_CLKCTL1)) {
        brcmf_dbg(ERROR, "ChipClkCSR access: err %d wrote 0x%02x read 0x%02x\n",
              err, BRCMF_INIT_CLKCTL1, clkctl);
        goto fail;
    }

    if (brcmf_sdio_chip_attach(bus->sdiodev, &bus->ci, regsva)) {
        brcmf_dbg(ERROR, "brcmf_sdio_chip_attach failed!\n");
        goto fail;
    }

    if (!brcmf_sdbrcm_chipmatch((u16) bus->ci->chip)) {
        brcmf_dbg(ERROR, "unsupported chip: 0x%04x\n", bus->ci->chip);
        goto fail;
    }

    brcmf_sdio_chip_drivestrengthinit(bus->sdiodev, bus->ci,
                      SDIO_DRIVE_STRENGTH);

    /* Get info on the SOCRAM cores... */
    bus->ramsize = bus->ci->ramsize;
    if (!(bus->ramsize)) {
        brcmf_dbg(ERROR, "failed to find SOCRAM memory!\n");
        goto fail;
    }

    /* Set core control so an SDIO reset does a backplane reset */
    idx = brcmf_sdio_chip_getinfidx(bus->ci, BCMA_CORE_SDIO_DEV);
    reg_addr = bus->ci->c_inf[idx].base +
           offsetof(struct sdpcmd_regs, corecontrol);
    reg_val = brcmf_sdio_regrl(bus->sdiodev, reg_addr, NULL);
    brcmf_sdio_regwl(bus->sdiodev, reg_addr, reg_val | CC_BPRESEN, NULL);

    brcmu_pktq_init(&bus->txq, (PRIOMASK + 1), TXQLEN);

    /* Locate an appropriately-aligned portion of hdrbuf */
    bus->rxhdr = (u8 *) roundup((unsigned long)&bus->hdrbuf[0],
                    BRCMF_SDALIGN);

    /* Set the poll and/or interrupt flags */
    bus->intr = true;
    bus->poll = false;
    if (bus->poll)
        bus->pollrate = 1;

    return true;

fail:
    return false;
}

static bool brcmf_sdbrcm_probe_init(struct brcmf_sdio *bus)
{
    brcmf_dbg(TRACE, "Enter\n");

    /* Disable F2 to clear any intermediate frame state on the dongle */
    brcmf_sdio_regwb(bus->sdiodev, SDIO_CCCR_IOEx,
             SDIO_FUNC_ENABLE_1, NULL);

    bus->sdiodev->bus_if->state = BRCMF_BUS_DOWN;
    bus->rxflow = false;

    /* Done with backplane-dependent accesses, can drop clock... */
    brcmf_sdio_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR, 0, NULL);

    /* ...and initialize clock/power states */
    bus->clkstate = CLK_SDONLY;
    bus->idletime = BRCMF_IDLE_INTERVAL;
    bus->idleclock = BRCMF_IDLE_ACTIVE;

    /* Query the F2 block size, set roundup accordingly */
    bus->blocksize = bus->sdiodev->func[2]->cur_blksize;
    bus->roundup = min(max_roundup, bus->blocksize);

    /* bus module does not support packet chaining */
    bus->use_rxchain = false;
    bus->sd_rxchain = false;

    return true;
}

static int
brcmf_sdbrcm_watchdog_thread(void *data)
{
    struct brcmf_sdio *bus = (struct brcmf_sdio *)data;

    allow_signal(SIGTERM);
    /* Run until signal received */
    while (1) {
        if (kthread_should_stop())
            break;
        if (!wait_for_completion_interruptible(&bus->watchdog_wait)) {
            brcmf_sdbrcm_bus_watchdog(bus);
            /* Count the tick for reference */
            bus->sdcnt.tickcnt++;
        } else
            break;
    }
    return 0;
}

static void
brcmf_sdbrcm_watchdog(unsigned long data)
{
    struct brcmf_sdio *bus = (struct brcmf_sdio *)data;

    if (bus->watchdog_tsk) {
        complete(&bus->watchdog_wait);
        /* Reschedule the watchdog */
        if (bus->wd_timer_valid)
            mod_timer(&bus->timer,
                  jiffies + BRCMF_WD_POLL_MS * HZ / 1000);
    }
}

static void brcmf_sdbrcm_release_dongle(struct brcmf_sdio *bus)
{
    brcmf_dbg(TRACE, "Enter\n");

    if (bus->ci) {
        brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);
        brcmf_sdbrcm_clkctl(bus, CLK_NONE, false);
        brcmf_sdio_chip_detach(&bus->ci);
        if (bus->vars && bus->varsz)
            kfree(bus->vars);
        bus->vars = NULL;
    }

    brcmf_dbg(TRACE, "Disconnected\n");
}

/* Detach and free everything */
static void brcmf_sdbrcm_release(struct brcmf_sdio *bus)
{
    brcmf_dbg(TRACE, "Enter\n");

    if (bus) {
        /* De-register interrupt handler */
        brcmf_sdio_intr_unregister(bus->sdiodev);

        cancel_work_sync(&bus->datawork);
        destroy_workqueue(bus->brcmf_wq);

        if (bus->sdiodev->bus_if->drvr) {
            brcmf_detach(bus->sdiodev->dev);
            brcmf_sdbrcm_release_dongle(bus);
        }

        brcmf_sdbrcm_release_malloc(bus);

        kfree(bus);
    }

    brcmf_dbg(TRACE, "Disconnected\n");
}

void *brcmf_sdbrcm_probe(u32 regsva, struct brcmf_sdio_dev *sdiodev)
{
    int ret;
    struct brcmf_sdio *bus;
    struct brcmf_bus_dcmd *dlst;
    u32 dngl_txglom;
    u32 dngl_txglomalign;
    u8 idx;

    brcmf_dbg(TRACE, "Enter\n");

    /* We make an assumption about address window mappings:
     * regsva == SI_ENUM_BASE*/

    /* Allocate private bus interface state */
    bus = kzalloc(sizeof(struct brcmf_sdio), GFP_ATOMIC);
    if (!bus)
        goto fail;

    bus->sdiodev = sdiodev;
    sdiodev->bus = bus;
    skb_queue_head_init(&bus->glom);
    bus->txbound = BRCMF_TXBOUND;
    bus->rxbound = BRCMF_RXBOUND;
    bus->txminmax = BRCMF_TXMINMAX;
    bus->tx_seq = SDPCM_SEQUENCE_WRAP - 1;

    /* attempt to attach to the dongle */
    if (!(brcmf_sdbrcm_probe_attach(bus, regsva))) {
        brcmf_dbg(ERROR, "brcmf_sdbrcm_probe_attach failed\n");
        goto fail;
    }

    spin_lock_init(&bus->txqlock);
    init_waitqueue_head(&bus->ctrl_wait);
    init_waitqueue_head(&bus->dcmd_resp_wait);

    bus->brcmf_wq = create_singlethread_workqueue("brcmf_wq");
    if (bus->brcmf_wq == NULL) {
        brcmf_dbg(ERROR, "insufficient memory to create txworkqueue\n");
        goto fail;
    }
    INIT_WORK(&bus->datawork, brcmf_sdio_dataworker);

    /* Set up the watchdog timer */
    init_timer(&bus->timer);
    bus->timer.data = (unsigned long)bus;
    bus->timer.function = brcmf_sdbrcm_watchdog;

    /* Initialize thread based operation and lock */
    sema_init(&bus->sdsem, 1);

    /* Initialize watchdog thread */
    init_completion(&bus->watchdog_wait);
    bus->watchdog_tsk = kthread_run(brcmf_sdbrcm_watchdog_thread,
                    bus, "brcmf_watchdog");
    if (IS_ERR(bus->watchdog_tsk)) {
        pr_warn("brcmf_watchdog thread failed to start\n");
        bus->watchdog_tsk = NULL;
    }
    /* Initialize DPC thread */
    INIT_LIST_HEAD(&bus->dpc_tsklst);
    spin_lock_init(&bus->dpc_tl_lock);

    /* Assign bus interface call back */
    bus->sdiodev->bus_if->brcmf_bus_stop = brcmf_sdbrcm_bus_stop;
    bus->sdiodev->bus_if->brcmf_bus_init = brcmf_sdbrcm_bus_init;
    bus->sdiodev->bus_if->brcmf_bus_txdata = brcmf_sdbrcm_bus_txdata;
    bus->sdiodev->bus_if->brcmf_bus_txctl = brcmf_sdbrcm_bus_txctl;
    bus->sdiodev->bus_if->brcmf_bus_rxctl = brcmf_sdbrcm_bus_rxctl;
    /* Attach to the brcmf/OS/network interface */
    ret = brcmf_attach(SDPCM_RESERVE, bus->sdiodev->dev);
    if (ret != 0) {
        brcmf_dbg(ERROR, "brcmf_attach failed\n");
        goto fail;
    }

    /* Allocate buffers */
    if (!(brcmf_sdbrcm_probe_malloc(bus))) {
        brcmf_dbg(ERROR, "brcmf_sdbrcm_probe_malloc failed\n");
        goto fail;
    }

    if (!(brcmf_sdbrcm_probe_init(bus))) {
        brcmf_dbg(ERROR, "brcmf_sdbrcm_probe_init failed\n");
        goto fail;
    }

    brcmf_sdio_debugfs_create(bus);
    brcmf_dbg(INFO, "completed!!\n");

    /* sdio bus core specific dcmd */
    idx = brcmf_sdio_chip_getinfidx(bus->ci, BCMA_CORE_SDIO_DEV);
    dlst = kzalloc(sizeof(struct brcmf_bus_dcmd), GFP_KERNEL);
    if (dlst) {
        if (bus->ci->c_inf[idx].rev < 12) {
            /* for sdio core rev < 12, disable txgloming */
            dngl_txglom = 0;
            dlst->name = "bus:txglom";
            dlst->param = (char *)&dngl_txglom;
            dlst->param_len = sizeof(u32);
        } else {
            /* otherwise, set txglomalign */
            dngl_txglomalign = bus->sdiodev->bus_if->align;
            dlst->name = "bus:txglomalign";
            dlst->param = (char *)&dngl_txglomalign;
            dlst->param_len = sizeof(u32);
        }
        list_add(&dlst->list, &bus->sdiodev->bus_if->dcmd_list);
    }

    /* if firmware path present try to download and bring up bus */
    ret = brcmf_bus_start(bus->sdiodev->dev);
    if (ret != 0) {
        if (ret == -ENOLINK) {
            brcmf_dbg(ERROR, "dongle is not responding\n");
            goto fail;
        }
    }

    return bus;

fail:
    brcmf_sdbrcm_release(bus);
    return NULL;
}

void brcmf_sdbrcm_disconnect(void *ptr)
{
    struct brcmf_sdio *bus = (struct brcmf_sdio *)ptr;

    brcmf_dbg(TRACE, "Enter\n");

    if (bus)
        brcmf_sdbrcm_release(bus);

    brcmf_dbg(TRACE, "Disconnected\n");
}

void
brcmf_sdbrcm_wd_timer(struct brcmf_sdio *bus, uint wdtick)
{
    /* Totally stop the timer */
    if (!wdtick && bus->wd_timer_valid) {
        del_timer_sync(&bus->timer);
        bus->wd_timer_valid = false;
        bus->save_ms = wdtick;
        return;
    }

    /* don't start the wd until fw is loaded */
    if (bus->sdiodev->bus_if->state == BRCMF_BUS_DOWN)
        return;

    if (wdtick) {
        if (bus->save_ms != BRCMF_WD_POLL_MS) {
            if (bus->wd_timer_valid)
                /* Stop timer and restart at new value */
                del_timer_sync(&bus->timer);

            /* Create timer again when watchdog period is
               dynamically changed or in the first instance
             */
            bus->timer.expires =
                jiffies + BRCMF_WD_POLL_MS * HZ / 1000;
            add_timer(&bus->timer);

        } else {
            /* Re arm the timer, at last watchdog period */
            mod_timer(&bus->timer,
                jiffies + BRCMF_WD_POLL_MS * HZ / 1000);
        }

        bus->wd_timer_valid = true;
        bus->save_ms = wdtick;
    }
}