arch/arm26/machine/dma.c

   1 /*
   2  *  linux/arch/arm26/kernel/dma.c
   3  *
   4  *  Copyright (C) 1998-1999 Dave Gilbert / Russell King
   5  *  Copyright (C) 2003 Ian Molton
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  *  DMA functions specific to Archimedes and A5000 architecture
  12  */
  13 #include <linux/config.h>
  14 #include <linux/sched.h>
  15 #include <linux/init.h>
  16
  17 #include <asm/dma.h>
  18 #include <asm/fiq.h>
  19 #include <asm/irq.h>
  20 #include <asm/io.h>
  21 #include <asm/hardware.h>
  22 #include <asm/mach-types.h>
  23
  24 #define DPRINTK(x...) printk(KERN_DEBUG x)
  25
  26 #if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)
  27
  28 extern unsigned char fdc1772_dma_read, fdc1772_dma_read_end;
  29 extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end;
  30 extern void fdc1772_setupdma(unsigned int count,unsigned int addr);
  31
  32 static void arc_floppy_data_enable_dma(dmach_t channel, dma_t *dma)
  33 {
  34         DPRINTK("arc_floppy_data_enable_dma\n");
  35
  36         if (dma->using_sg)
  37                 BUG();
  38
  39         switch (dma->dma_mode) {
  40         case DMA_MODE_READ: { /* read */
  41                 unsigned long flags;
  42                 DPRINTK("enable_dma fdc1772 data read\n");
  43                 local_save_flags_cli(flags);
  44                 clf();
  45
  46                 memcpy ((void *)0x1c, (void *)&fdc1772_dma_read,
  47                         &fdc1772_dma_read_end - &fdc1772_dma_read);
  48                 fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */
  49                 enable_fiq(FIQ_FLOPPYDATA);
  50                 local_irq_restore(flags);
  51            }
  52            break;
  53
  54         case DMA_MODE_WRITE: { /* write */
  55                 unsigned long flags;
  56                 DPRINTK("enable_dma fdc1772 data write\n");
  57                 local_save_flags_cli(flags);
  58                 clf();
  59                 memcpy ((void *)0x1c, (void *)&fdc1772_dma_write,
  60                         &fdc1772_dma_write_end - &fdc1772_dma_write);
  61                 fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */
  62                 enable_fiq(FIQ_FLOPPYDATA);
  63
  64                 local_irq_restore(flags);
  65             }
  66             break;
  67         default:
  68                 printk ("enable_dma: dma%d not initialised\n", channel);
  69         }
  70 }
  71
  72 static int arc_floppy_data_get_dma_residue(dmach_t channel, dma_t *dma)
  73 {
  74         extern unsigned int fdc1772_bytestogo;
  75
  76         /* 10/1/1999 DAG - I presume its the number of bytes left? */
  77         return fdc1772_bytestogo;
  78 }
  79
  80 static void arc_floppy_cmdend_enable_dma(dmach_t channel, dma_t *dma)
  81 {
  82         /* Need to build a branch at the FIQ address */
  83         extern void fdc1772_comendhandler(void);
  84         unsigned long flags;
  85
  86         DPRINTK("arc_floppy_cmdend_enable_dma\n");
  87         /*printk("enable_dma fdc1772 command end FIQ\n");*/
  88         save_flags(flags);
  89         clf();
  90
  91         /* B fdc1772_comendhandler */
  92         *((unsigned int *)0x1c)=0xea000000 |
  93                         (((unsigned int)fdc1772_comendhandler-(0x1c+8))/4);
  94
  95         local_irq_restore(flags);
  96 }
  97
  98 static int arc_floppy_cmdend_get_dma_residue(dmach_t channel, dma_t *dma)
  99 {
 100         /* 10/1/1999 DAG - Presume whether there is an outstanding command? */
 101         extern unsigned int fdc1772_fdc_int_done;
 102
 103         /* Explicit! If the int done is 0 then 1 int to go */
 104         return (fdc1772_fdc_int_done==0)?1:0;
 105 }
 106
 107 static void arc_disable_dma(dmach_t channel, dma_t *dma)
 108 {
 109         disable_fiq(dma->dma_irq);
 110 }
 111
 112 static struct dma_ops arc_floppy_data_dma_ops = {
 113         .type           = "FIQDMA",
 114         .enable         = arc_floppy_data_enable_dma,
 115         .disable        = arc_disable_dma,
 116         .residue        = arc_floppy_data_get_dma_residue,
 117 };
 118
 119 static struct dma_ops arc_floppy_cmdend_dma_ops = {
 120         .type           = "FIQCMD",
 121         .enable         = arc_floppy_cmdend_enable_dma,
 122         .disable        = arc_disable_dma,
 123         .residue        = arc_floppy_cmdend_get_dma_residue,
 124 };
 125 #endif
 126
 127 #ifdef CONFIG_ARCH_A5K
 128 static struct fiq_handler fh = {
 129         .name   = "floppydata"
 130 };
 131
 132 static int a5k_floppy_get_dma_residue(dmach_t channel, dma_t *dma)
 133 {
 134         struct pt_regs regs;
 135         get_fiq_regs(&regs);
 136         return regs.ARM_r9;
 137 }
 138
 139 static void a5k_floppy_enable_dma(dmach_t channel, dma_t *dma)
 140 {
 141         struct pt_regs regs;
 142         void *fiqhandler_start;
 143         unsigned int fiqhandler_length;
 144         extern void floppy_fiqsetup(unsigned long len, unsigned long addr,
 145                                      unsigned long port);
 146
 147         if (dma->using_sg)
 148                 BUG();
 149
 150         if (dma->dma_mode == DMA_MODE_READ) {
 151                 extern unsigned char floppy_fiqin_start, floppy_fiqin_end;
 152                 fiqhandler_start = &floppy_fiqin_start;
 153                 fiqhandler_length = &floppy_fiqin_end - &floppy_fiqin_start;
 154         } else {
 155                 extern unsigned char floppy_fiqout_start, floppy_fiqout_end;
 156                 fiqhandler_start = &floppy_fiqout_start;
 157                 fiqhandler_length = &floppy_fiqout_end - &floppy_fiqout_start;
 158         }
 159         if (claim_fiq(&fh)) {
 160                 printk("floppydma: couldn't claim FIQ.\n");
 161                 return;
 162         }
 163         memcpy((void *)0x1c, fiqhandler_start, fiqhandler_length);
 164         regs.ARM_r9 = dma->buf.length;
 165         regs.ARM_r10 = (unsigned long)dma->buf.__address;
 166         regs.ARM_fp = FLOPPYDMA_BASE;
 167         set_fiq_regs(&regs);
 168         enable_fiq(dma->dma_irq);
 169 }
 170
 171 static void a5k_floppy_disable_dma(dmach_t channel, dma_t *dma)
 172 {
 173         disable_fiq(dma->dma_irq);
 174         release_fiq(&fh);
 175 }
 176
 177 static struct dma_ops a5k_floppy_dma_ops = {
 178         .type           = "FIQDMA",
 179         .enable         = a5k_floppy_enable_dma,
 180         .disable        = a5k_floppy_disable_dma,
 181         .residue        = a5k_floppy_get_dma_residue,
 182 };
 183 #endif
 184
 185 /*
 186  * This is virtual DMA - we don't need anything here
 187  */
 188 static void sound_enable_disable_dma(dmach_t channel, dma_t *dma)
 189 {
 190 }
 191
 192 static struct dma_ops sound_dma_ops = {
 193         .type           = "VIRTUAL",
 194         .enable         = sound_enable_disable_dma,
 195         .disable        = sound_enable_disable_dma,
 196 };
 197
 198 void __init arch_dma_init(dma_t *dma)
 199 {
 200 #if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)
 201         if (machine_is_archimedes()) {
 202                 dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
 203                 dma[DMA_VIRTUAL_FLOPPY0].d_ops   = &arc_floppy_data_dma_ops;
 204                 dma[DMA_VIRTUAL_FLOPPY1].dma_irq = 1;
 205                 dma[DMA_VIRTUAL_FLOPPY1].d_ops   = &arc_floppy_cmdend_dma_ops;
 206         }
 207 #endif
 208 #ifdef CONFIG_ARCH_A5K
 209         if (machine_is_a5k()) {
 210                 dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
 211                 dma[DMA_VIRTUAL_FLOPPY0].d_ops   = &a5k_floppy_dma_ops;
 212         }
 213 #endif
 214         dma[DMA_VIRTUAL_SOUND].d_ops = &sound_dma_ops;
 215 }