ifx6x60.h

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/****************************************************************************
 *
 * Driver for the IFX spi modem.
 *
 * Copyright (C) 2009, 2010 Intel Corp
 * Jim Stanley <[email protected]>
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA
 *
 *
 *
 *****************************************************************************/
#ifndef _IFX6X60_H
#define _IFX6X60_H

#define DRVNAME             "ifx6x60"
#define TTYNAME             "ttyIFX"

#define IFX_SPI_MAX_MINORS      1
#define IFX_SPI_TRANSFER_SIZE       2048
#define IFX_SPI_FIFO_SIZE       4096

#define IFX_SPI_HEADER_OVERHEAD     4
#define IFX_RESET_TIMEOUT       msecs_to_jiffies(50)

/* device flags bitfield definitions */
#define IFX_SPI_STATE_PRESENT       0
#define IFX_SPI_STATE_IO_IN_PROGRESS    1
#define IFX_SPI_STATE_IO_READY      2
#define IFX_SPI_STATE_TIMER_PENDING 3

/* flow control bitfields */
#define IFX_SPI_DCD         0
#define IFX_SPI_CTS         1
#define IFX_SPI_DSR         2
#define IFX_SPI_RI          3
#define IFX_SPI_DTR         4
#define IFX_SPI_RTS         5
#define IFX_SPI_TX_FC           6
#define IFX_SPI_RX_FC           7
#define IFX_SPI_UPDATE          8

#define IFX_SPI_PAYLOAD_SIZE        (IFX_SPI_TRANSFER_SIZE - \
                        IFX_SPI_HEADER_OVERHEAD)

#define IFX_SPI_IRQ_TYPE        DETECT_EDGE_RISING
#define IFX_SPI_GPIO_TARGET     0
#define IFX_SPI_GPIO0           0x105

#define IFX_SPI_STATUS_TIMEOUT      (2000*HZ)

/* values for bits in power status byte */
#define IFX_SPI_POWER_DATA_PENDING  1
#define IFX_SPI_POWER_SRDY      2

struct ifx_spi_device {
    /* Our SPI device */
    struct spi_device *spi_dev;

    /* Port specific data */
    struct kfifo tx_fifo;
    spinlock_t fifo_lock;
    unsigned long signal_state;

    /* TTY Layer logic */
    struct tty_port tty_port;
    struct device *tty_dev;
    int minor;

    /* Low level I/O work */
    struct tasklet_struct io_work_tasklet;
    unsigned long flags;
    dma_addr_t rx_dma;
    dma_addr_t tx_dma;

    int modem;      /* Modem type */
    int use_dma;        /* provide dma-able addrs in SPI msg */
    long max_hz;        /* max SPI frequency */

    spinlock_t write_lock;
    int write_pending;
    spinlock_t power_lock;
    unsigned char power_status;

    unsigned char *rx_buffer;
    unsigned char *tx_buffer;
    dma_addr_t rx_bus;
    dma_addr_t tx_bus;
    unsigned char spi_more;
    unsigned char spi_slave_cts;

    struct timer_list spi_timer;

    struct spi_message spi_msg;
    struct spi_transfer spi_xfer;

    struct {
        /* gpio lines */
        unsigned short srdy;        /* slave-ready gpio */
        unsigned short mrdy;        /* master-ready gpio */
        unsigned short reset;       /* modem-reset gpio */
        unsigned short po;      /* modem-on gpio */
        unsigned short reset_out;   /* modem-in-reset gpio */
        /* state/stats */
        int unack_srdy_int_nb;
    } gpio;

    /* modem reset */
    unsigned long mdm_reset_state;
#define MR_START    0
#define MR_INPROGRESS   1
#define MR_COMPLETE 2
    wait_queue_head_t mdm_reset_wait;
};

#endif /* _IFX6X60_H */