floppy_32.h

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/* asm/floppy.h: Sparc specific parts of the Floppy driver.
 *
 * Copyright (C) 1995 David S. Miller ([email protected])
 */

#ifndef __ASM_SPARC_FLOPPY_H
#define __ASM_SPARC_FLOPPY_H

#include <linux/of.h>
#include <linux/of_device.h>

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/idprom.h>
#include <asm/oplib.h>
#include <asm/auxio.h>
#include <asm/irq.h>

/* We don't need no stinkin' I/O port allocation crap. */
#undef release_region
#undef request_region
#define release_region(X, Y)    do { } while(0)
#define request_region(X, Y, Z) (1)

/* References:
 * 1) Netbsd Sun floppy driver.
 * 2) NCR 82077 controller manual
 * 3) Intel 82077 controller manual
 */
struct sun_flpy_controller {
    volatile unsigned char status_82072;  /* Main Status reg. */
#define dcr_82072              status_82072   /* Digital Control reg. */
#define status1_82077          status_82072   /* Auxiliary Status reg. 1 */

    volatile unsigned char data_82072;    /* Data fifo. */
#define status2_82077          data_82072     /* Auxiliary Status reg. 2 */

    volatile unsigned char dor_82077;     /* Digital Output reg. */
    volatile unsigned char tapectl_82077; /* What the? Tape control reg? */

    volatile unsigned char status_82077;  /* Main Status Register. */
#define drs_82077              status_82077   /* Digital Rate Select reg. */

    volatile unsigned char data_82077;    /* Data fifo. */
    volatile unsigned char ___unused;
    volatile unsigned char dir_82077;     /* Digital Input reg. */
#define dcr_82077              dir_82077      /* Config Control reg. */
};

/* You'll only ever find one controller on a SparcStation anyways. */
static struct sun_flpy_controller *sun_fdc = NULL;
extern volatile unsigned char *fdc_status;

struct sun_floppy_ops {
    unsigned char (*fd_inb)(int port);
    void (*fd_outb)(unsigned char value, int port);
};

static struct sun_floppy_ops sun_fdops;

#define fd_inb(port)              sun_fdops.fd_inb(port)
#define fd_outb(value,port)       sun_fdops.fd_outb(value,port)
#define fd_enable_dma()           sun_fd_enable_dma()
#define fd_disable_dma()          sun_fd_disable_dma()
#define fd_request_dma()          (0) /* nothing... */
#define fd_free_dma()             /* nothing... */
#define fd_clear_dma_ff()         /* nothing... */
#define fd_set_dma_mode(mode)     sun_fd_set_dma_mode(mode)
#define fd_set_dma_addr(addr)     sun_fd_set_dma_addr(addr)
#define fd_set_dma_count(count)   sun_fd_set_dma_count(count)
#define fd_enable_irq()           /* nothing... */
#define fd_disable_irq()          /* nothing... */
#define fd_cacheflush(addr, size) /* nothing... */
#define fd_request_irq()          sun_fd_request_irq()
#define fd_free_irq()             /* nothing... */
#if 0  /* P3: added by Alain, these cause a MMU corruption. 19960524 XXX */
#define fd_dma_mem_alloc(size)    ((unsigned long) vmalloc(size))
#define fd_dma_mem_free(addr,size) (vfree((void *)(addr)))
#endif

/* XXX This isn't really correct. XXX */
#define get_dma_residue(x)        (0)

#define FLOPPY0_TYPE  4
#define FLOPPY1_TYPE  0

/* Super paranoid... */
#undef HAVE_DISABLE_HLT

/* Here is where we catch the floppy driver trying to initialize,
 * therefore this is where we call the PROM device tree probing
 * routine etc. on the Sparc.
 */
#define FDC1                      sun_floppy_init()

#define N_FDC    1
#define N_DRIVE  8

/* No 64k boundary crossing problems on the Sparc. */
#define CROSS_64KB(a,s) (0)

/* Routines unique to each controller type on a Sun. */
static void sun_set_dor(unsigned char value, int fdc_82077)
{
    if (fdc_82077)
        sun_fdc->dor_82077 = value;
}

static unsigned char sun_read_dir(void)
{
    return sun_fdc->dir_82077;
}

static unsigned char sun_82072_fd_inb(int port)
{
    udelay(5);
    switch(port & 7) {
    default:
        printk("floppy: Asked to read unknown port %d\n", port);
        panic("floppy: Port bolixed.");
    case 4: /* FD_STATUS */
        return sun_fdc->status_82072 & ~STATUS_DMA;
    case 5: /* FD_DATA */
        return sun_fdc->data_82072;
    case 7: /* FD_DIR */
        return sun_read_dir();
    }
    panic("sun_82072_fd_inb: How did I get here?");
}

static void sun_82072_fd_outb(unsigned char value, int port)
{
    udelay(5);
    switch(port & 7) {
    default:
        printk("floppy: Asked to write to unknown port %d\n", port);
        panic("floppy: Port bolixed.");
    case 2: /* FD_DOR */
        sun_set_dor(value, 0);
        break;
    case 5: /* FD_DATA */
        sun_fdc->data_82072 = value;
        break;
    case 7: /* FD_DCR */
        sun_fdc->dcr_82072 = value;
        break;
    case 4: /* FD_STATUS */
        sun_fdc->status_82072 = value;
        break;
    }
    return;
}

static unsigned char sun_82077_fd_inb(int port)
{
    udelay(5);
    switch(port & 7) {
    default:
        printk("floppy: Asked to read unknown port %d\n", port);
        panic("floppy: Port bolixed.");
    case 0: /* FD_STATUS_0 */
        return sun_fdc->status1_82077;
    case 1: /* FD_STATUS_1 */
        return sun_fdc->status2_82077;
    case 2: /* FD_DOR */
        return sun_fdc->dor_82077;
    case 3: /* FD_TDR */
        return sun_fdc->tapectl_82077;
    case 4: /* FD_STATUS */
        return sun_fdc->status_82077 & ~STATUS_DMA;
    case 5: /* FD_DATA */
        return sun_fdc->data_82077;
    case 7: /* FD_DIR */
        return sun_read_dir();
    }
    panic("sun_82077_fd_inb: How did I get here?");
}

static void sun_82077_fd_outb(unsigned char value, int port)
{
    udelay(5);
    switch(port & 7) {
    default:
        printk("floppy: Asked to write to unknown port %d\n", port);
        panic("floppy: Port bolixed.");
    case 2: /* FD_DOR */
        sun_set_dor(value, 1);
        break;
    case 5: /* FD_DATA */
        sun_fdc->data_82077 = value;
        break;
    case 7: /* FD_DCR */
        sun_fdc->dcr_82077 = value;
        break;
    case 4: /* FD_STATUS */
        sun_fdc->status_82077 = value;
        break;
    case 3: /* FD_TDR */
        sun_fdc->tapectl_82077 = value;
        break;
    }
    return;
}

/* For pseudo-dma (Sun floppy drives have no real DMA available to
 * them so we must eat the data fifo bytes directly ourselves) we have
 * three state variables.  doing_pdma tells our inline low-level
 * assembly floppy interrupt entry point whether it should sit and eat
 * bytes from the fifo or just transfer control up to the higher level
 * floppy interrupt c-code.  I tried very hard but I could not get the
 * pseudo-dma to work in c-code without getting many overruns and
 * underruns.  If non-zero, doing_pdma encodes the direction of
 * the transfer for debugging.  1=read 2=write
 */
extern char *pdma_vaddr;
extern unsigned long pdma_size;
extern volatile int doing_pdma;

/* This is software state */
extern char *pdma_base;
extern unsigned long pdma_areasize;

/* Common routines to all controller types on the Sparc. */
static inline void virtual_dma_init(void)
{
    /* nothing... */
}

static inline void sun_fd_disable_dma(void)
{
    doing_pdma = 0;
    pdma_base = NULL;
}

static inline void sun_fd_set_dma_mode(int mode)
{
    switch(mode) {
    case DMA_MODE_READ:
        doing_pdma = 1;
        break;
    case DMA_MODE_WRITE:
        doing_pdma = 2;
        break;
    default:
        printk("Unknown dma mode %d\n", mode);
        panic("floppy: Giving up...");
    }
}

static inline void sun_fd_set_dma_addr(char *buffer)
{
    pdma_vaddr = buffer;
}

static inline void sun_fd_set_dma_count(int length)
{
    pdma_size = length;
}

static inline void sun_fd_enable_dma(void)
{
    pdma_base = pdma_vaddr;
    pdma_areasize = pdma_size;
}

extern int sparc_floppy_request_irq(unsigned int irq,
                                    irq_handler_t irq_handler);

static int sun_fd_request_irq(void)
{
    static int once = 0;

    if (!once) {
        once = 1;
        return sparc_floppy_request_irq(FLOPPY_IRQ, floppy_interrupt);
    } else {
        return 0;
    }
}

static struct linux_prom_registers fd_regs[2];

static int sun_floppy_init(void)
{
    struct platform_device *op;
    struct device_node *dp;
    struct resource r;
    char state[128];
    phandle fd_node;
    phandle tnode;
    int num_regs;

    use_virtual_dma = 1;

    /* Forget it if we aren't on a machine that could possibly
     * ever have a floppy drive.
     */
    if (sparc_cpu_model != sun4m) {
        /* We certainly don't have a floppy controller. */
        goto no_sun_fdc;
    }
    /* Well, try to find one. */
    tnode = prom_getchild(prom_root_node);
    fd_node = prom_searchsiblings(tnode, "obio");
    if (fd_node != 0) {
        tnode = prom_getchild(fd_node);
        fd_node = prom_searchsiblings(tnode, "SUNW,fdtwo");
    } else {
        fd_node = prom_searchsiblings(tnode, "fd");
    }
    if (fd_node == 0) {
        goto no_sun_fdc;
    }

    /* The sun4m lets us know if the controller is actually usable. */
    if (prom_getproperty(fd_node, "status", state, sizeof(state)) != -1) {
        if(!strcmp(state, "disabled")) {
            goto no_sun_fdc;
        }
    }
    num_regs = prom_getproperty(fd_node, "reg", (char *) fd_regs, sizeof(fd_regs));
    num_regs = (num_regs / sizeof(fd_regs[0]));
    prom_apply_obio_ranges(fd_regs, num_regs);
    memset(&r, 0, sizeof(r));
    r.flags = fd_regs[0].which_io;
    r.start = fd_regs[0].phys_addr;
    sun_fdc = of_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");

    /* Look up irq in platform_device.
     * We try "SUNW,fdtwo" and "fd"
     */
    op = NULL;
    for_each_node_by_name(dp, "SUNW,fdtwo") {
        op = of_find_device_by_node(dp);
        if (op)
            break;
    }
    if (!op) {
        for_each_node_by_name(dp, "fd") {
            op = of_find_device_by_node(dp);
            if (op)
                break;
        }
    }
    if (!op)
        goto no_sun_fdc;

    FLOPPY_IRQ = op->archdata.irqs[0];

    /* Last minute sanity check... */
    if (sun_fdc->status_82072 == 0xff) {
        sun_fdc = NULL;
        goto no_sun_fdc;
    }

    sun_fdops.fd_inb = sun_82077_fd_inb;
    sun_fdops.fd_outb = sun_82077_fd_outb;
    fdc_status = &sun_fdc->status_82077;

    if (sun_fdc->dor_82077 == 0x80) {
        sun_fdc->dor_82077 = 0x02;
        if (sun_fdc->dor_82077 == 0x80) {
            sun_fdops.fd_inb = sun_82072_fd_inb;
            sun_fdops.fd_outb = sun_82072_fd_outb;
            fdc_status = &sun_fdc->status_82072;
        }
    }

    /* Success... */
    allowed_drive_mask = 0x01;
    return (int) sun_fdc;

no_sun_fdc:
    return -1;
}

static int sparc_eject(void)
{
    set_dor(0x00, 0xff, 0x90);
    udelay(500);
    set_dor(0x00, 0x6f, 0x00);
    udelay(500);
    return 0;
}

#define fd_eject(drive) sparc_eject()

#define EXTRA_FLOPPY_PARAMS

static DEFINE_SPINLOCK(dma_spin_lock);

#define claim_dma_lock() \
({  unsigned long flags; \
    spin_lock_irqsave(&dma_spin_lock, flags); \
    flags; \
})

#define release_dma_lock(__flags) \
    spin_unlock_irqrestore(&dma_spin_lock, __flags);

#endif /* !(__ASM_SPARC_FLOPPY_H) */