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floppy_32.h

/* asm/floppy.h: Sparc specific parts of the Floppy driver.
 *
 * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
 */

#ifndef __ASM_SPARC_FLOPPY_H
#define __ASM_SPARC_FLOPPY_H

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/idprom.h>
#include <asm/machines.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 (sparc_cpu_model == sun4c) {
            unsigned int bits = 0;
            if (value & 0x10)
                  bits |= AUXIO_FLPY_DSEL;
            if ((value & 0x80) == 0)
                  bits |= AUXIO_FLPY_EJCT;
            set_auxio(bits, (~bits) & (AUXIO_FLPY_DSEL|AUXIO_FLPY_EJCT));
      }
      if (fdc_82077) {
            sun_fdc->dor_82077 = value;
      }
}

static unsigned char sun_read_dir(void)
{
      if (sparc_cpu_model == sun4c)
            return (get_auxio() & AUXIO_FLPY_DCHG) ? 0x80 : 0;
      else
            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;
      if (pdma_base) {
            mmu_unlockarea(pdma_base, pdma_areasize);
            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_vaddr = mmu_lockarea(pdma_vaddr, pdma_size);
      pdma_base = pdma_vaddr;
      pdma_areasize = pdma_size;
}

/* Our low-level entry point in arch/sparc/kernel/entry.S */
extern int sparc_floppy_request_irq(int irq, unsigned long flags,
                            irq_handler_t irq_handler);

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

      if(!once) {
            once = 1;
            error = sparc_floppy_request_irq(FLOPPY_IRQ,
                                     IRQF_DISABLED,
                                     floppy_interrupt);
            return ((error == 0) ? 0 : -1);
      } else return 0;
}

static struct linux_prom_registers fd_regs[2];

static int sun_floppy_init(void)
{
      char state[128];
      int tnode, fd_node, num_regs;
      struct resource r;

      use_virtual_dma = 1;

      FLOPPY_IRQ = 11;
      /* Forget it if we aren't on a machine that could possibly
       * ever have a floppy drive.
       */
      if((sparc_cpu_model != sun4c && sparc_cpu_model != sun4m) ||
         ((idprom->id_machtype == (SM_SUN4C | SM_4C_SLC)) ||
          (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC)))) {
            /* 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(sparc_cpu_model == sun4m &&
         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 = (struct sun_flpy_controller *)
          sbus_ioremap(&r, 0, fd_regs[0].reg_size, "floppy");

      /* 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

#endif /* !(__ASM_SPARC_FLOPPY_H) */

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