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Sourcecode: linux-2.6 version File versions

dma.c

/*
 *  linux/arch/arm26/kernel/dma.c
 *
 *  Copyright (C) 1998-1999 Dave Gilbert / Russell King
 *  Copyright (C) 2003 Ian Molton
 *
 * 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.
 *
 *  DMA functions specific to Archimedes and A5000 architecture
 */
#include <linux/sched.h>
#include <linux/init.h>

#include <asm/dma.h>
#include <asm/fiq.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/mach-types.h>

#define DPRINTK(x...) printk(KERN_DEBUG x)

#if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)

extern unsigned char fdc1772_dma_read, fdc1772_dma_read_end;
extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end;
extern void fdc1772_setupdma(unsigned int count,unsigned int addr);

static void arc_floppy_data_enable_dma(dmach_t channel, dma_t *dma)
{
      DPRINTK("arc_floppy_data_enable_dma\n");

      if (dma->using_sg)
            BUG();

      switch (dma->dma_mode) {
      case DMA_MODE_READ: { /* read */
            unsigned long flags;
            DPRINTK("enable_dma fdc1772 data read\n");
            local_save_flags_cli(flags);
            clf();
                  
            memcpy ((void *)0x1c, (void *)&fdc1772_dma_read,
                  &fdc1772_dma_read_end - &fdc1772_dma_read);
            fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */
            enable_fiq(FIQ_FLOPPYDATA);
            local_irq_restore(flags);
         }
         break;

      case DMA_MODE_WRITE: { /* write */
            unsigned long flags;
            DPRINTK("enable_dma fdc1772 data write\n");
            local_save_flags_cli(flags);
            clf();
            memcpy ((void *)0x1c, (void *)&fdc1772_dma_write,
                  &fdc1772_dma_write_end - &fdc1772_dma_write);
            fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */
            enable_fiq(FIQ_FLOPPYDATA);

            local_irq_restore(flags);
          }
          break;
      default:
            printk ("enable_dma: dma%d not initialised\n", channel);
      }
}

static int arc_floppy_data_get_dma_residue(dmach_t channel, dma_t *dma)
{
      extern unsigned int fdc1772_bytestogo;

      /* 10/1/1999 DAG - I presume its the number of bytes left? */
      return fdc1772_bytestogo;
}

static void arc_floppy_cmdend_enable_dma(dmach_t channel, dma_t *dma)
{
      /* Need to build a branch at the FIQ address */
      extern void fdc1772_comendhandler(void);
      unsigned long flags;

      DPRINTK("arc_floppy_cmdend_enable_dma\n");
      /*printk("enable_dma fdc1772 command end FIQ\n");*/
      save_flags(flags);
      clf();
      
      /* B fdc1772_comendhandler */
      *((unsigned int *)0x1c)=0xea000000 |
                  (((unsigned int)fdc1772_comendhandler-(0x1c+8))/4);

      local_irq_restore(flags);
}

static int arc_floppy_cmdend_get_dma_residue(dmach_t channel, dma_t *dma)
{
      /* 10/1/1999 DAG - Presume whether there is an outstanding command? */
      extern unsigned int fdc1772_fdc_int_done;

      /* Explicit! If the int done is 0 then 1 int to go */
      return (fdc1772_fdc_int_done==0)?1:0;
}

static void arc_disable_dma(dmach_t channel, dma_t *dma)
{
      disable_fiq(dma->dma_irq);
}

static struct dma_ops arc_floppy_data_dma_ops = {
      .type       = "FIQDMA",
      .enable           = arc_floppy_data_enable_dma,
      .disable    = arc_disable_dma,
      .residue    = arc_floppy_data_get_dma_residue,
};

static struct dma_ops arc_floppy_cmdend_dma_ops = {
      .type       = "FIQCMD",
      .enable           = arc_floppy_cmdend_enable_dma,
      .disable    = arc_disable_dma,
      .residue    = arc_floppy_cmdend_get_dma_residue,
};
#endif

#ifdef CONFIG_ARCH_A5K
static struct fiq_handler fh = {
      .name = "floppydata"
};

static int a5k_floppy_get_dma_residue(dmach_t channel, dma_t *dma)
{
      struct pt_regs regs;
      get_fiq_regs(&regs);
      return regs.ARM_r9;
}

static void a5k_floppy_enable_dma(dmach_t channel, dma_t *dma)
{
      struct pt_regs regs;
      void *fiqhandler_start;
      unsigned int fiqhandler_length;
      extern void floppy_fiqsetup(unsigned long len, unsigned long addr,
                             unsigned long port);

      if (dma->using_sg)
            BUG();

      if (dma->dma_mode == DMA_MODE_READ) {
            extern unsigned char floppy_fiqin_start, floppy_fiqin_end;
            fiqhandler_start = &floppy_fiqin_start;
            fiqhandler_length = &floppy_fiqin_end - &floppy_fiqin_start;
      } else {
            extern unsigned char floppy_fiqout_start, floppy_fiqout_end;
            fiqhandler_start = &floppy_fiqout_start;
            fiqhandler_length = &floppy_fiqout_end - &floppy_fiqout_start;
      }
      if (claim_fiq(&fh)) {
            printk("floppydma: couldn't claim FIQ.\n");
            return;
      }
      memcpy((void *)0x1c, fiqhandler_start, fiqhandler_length);
      regs.ARM_r9 = dma->buf.length;
      regs.ARM_r10 = (unsigned long)dma->buf.__address;
      regs.ARM_fp = FLOPPYDMA_BASE;
      set_fiq_regs(&regs);
      enable_fiq(dma->dma_irq);
}

static void a5k_floppy_disable_dma(dmach_t channel, dma_t *dma)
{
      disable_fiq(dma->dma_irq);
      release_fiq(&fh);
}

static struct dma_ops a5k_floppy_dma_ops = {
      .type       = "FIQDMA",
      .enable           = a5k_floppy_enable_dma,
      .disable    = a5k_floppy_disable_dma,
      .residue    = a5k_floppy_get_dma_residue,
};
#endif

/*
 * This is virtual DMA - we don't need anything here
 */
static void sound_enable_disable_dma(dmach_t channel, dma_t *dma)
{
}

static struct dma_ops sound_dma_ops = {
      .type       = "VIRTUAL",
      .enable           = sound_enable_disable_dma,
      .disable    = sound_enable_disable_dma,
};

void __init arch_dma_init(dma_t *dma)
{
#if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)
      if (machine_is_archimedes()) {
            dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
            dma[DMA_VIRTUAL_FLOPPY0].d_ops   = &arc_floppy_data_dma_ops;
            dma[DMA_VIRTUAL_FLOPPY1].dma_irq = 1;
            dma[DMA_VIRTUAL_FLOPPY1].d_ops   = &arc_floppy_cmdend_dma_ops;
      }
#endif
#ifdef CONFIG_ARCH_A5K
      if (machine_is_a5k()) {
            dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
            dma[DMA_VIRTUAL_FLOPPY0].d_ops   = &a5k_floppy_dma_ops;
      }
#endif
      dma[DMA_VIRTUAL_SOUND].d_ops = &sound_dma_ops;
}

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