release/src-rt-6.x/linux/linux-2.6/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/sched.h>
  14 #include <linux/init.h>
  15
  16 #include <asm/dma.h>
  17 #include <asm/fiq.h>
  18 #include <asm/irq.h>
  19 #include <asm/io.h>
  20 #include <asm/hardware.h>
  21 #include <asm/mach-types.h>
  22
  23 #define DPRINTK(x...) printk(KERN_DEBUG x)
  24
  25 #if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)
  26
  27 extern unsigned char fdc1772_dma_read, fdc1772_dma_read_end;
  28 extern unsigned char fdc1772_dma_write, fdc1772_dma_write_end;
  29 extern void fdc1772_setupdma(unsigned int count,unsigned int addr);
  30
  31 static void arc_floppy_data_enable_dma(dmach_t channel, dma_t *dma)
  32 {
  33         DPRINTK("arc_floppy_data_enable_dma\n");
  34
  35         if (dma->using_sg)
  36                 BUG();
  37
  38         switch (dma->dma_mode) {
  39         case DMA_MODE_READ: { /* read */
  40                 unsigned long flags;
  41                 DPRINTK("enable_dma fdc1772 data read\n");
  42                 local_save_flags_cli(flags);
  43                 clf();
  44
  45                 memcpy ((void *)0x1c, (void *)&fdc1772_dma_read,
  46                         &fdc1772_dma_read_end - &fdc1772_dma_read);
  47                 fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */
  48                 enable_fiq(FIQ_FLOPPYDATA);
  49                 local_irq_restore(flags);
  50            }
  51            break;
  52
  53         case DMA_MODE_WRITE: { /* write */
  54                 unsigned long flags;
  55                 DPRINTK("enable_dma fdc1772 data write\n");
  56                 local_save_flags_cli(flags);
  57                 clf();
  58                 memcpy ((void *)0x1c, (void *)&fdc1772_dma_write,
  59                         &fdc1772_dma_write_end - &fdc1772_dma_write);
  60                 fdc1772_setupdma(dma->buf.length, dma->buf.__address); /* Sets data pointer up */
  61                 enable_fiq(FIQ_FLOPPYDATA);
  62
  63                 local_irq_restore(flags);
  64             }
  65             break;
  66         default:
  67                 printk ("enable_dma: dma%d not initialised\n", channel);
  68         }
  69 }
  70
  71 static int arc_floppy_data_get_dma_residue(dmach_t channel, dma_t *dma)
  72 {
  73         extern unsigned int fdc1772_bytestogo;
  74
  75         /* 10/1/1999 DAG - I presume its the number of bytes left? */
  76         return fdc1772_bytestogo;
  77 }
  78
  79 static void arc_floppy_cmdend_enable_dma(dmach_t channel, dma_t *dma)
  80 {
  81         /* Need to build a branch at the FIQ address */
  82         extern void fdc1772_comendhandler(void);
  83         unsigned long flags;
  84
  85         DPRINTK("arc_floppy_cmdend_enable_dma\n");
  86         /*printk("enable_dma fdc1772 command end FIQ\n");*/
  87         save_flags(flags);
  88         clf();
  89
  90         /* B fdc1772_comendhandler */
  91         *((unsigned int *)0x1c)=0xea000000 |
  92                         (((unsigned int)fdc1772_comendhandler-(0x1c+8))/4);
  93
  94         local_irq_restore(flags);
  95 }
  96
  97 static int arc_floppy_cmdend_get_dma_residue(dmach_t channel, dma_t *dma)
  98 {
  99         /* 10/1/1999 DAG - Presume whether there is an outstanding command? */
 100         extern unsigned int fdc1772_fdc_int_done;
 101
 102         /* Explicit! If the int done is 0 then 1 int to go */
 103         return (fdc1772_fdc_int_done==0)?1:0;
 104 }
 105
 106 static void arc_disable_dma(dmach_t channel, dma_t *dma)
 107 {
 108         disable_fiq(dma->dma_irq);
 109 }
 110
 111 static struct dma_ops arc_floppy_data_dma_ops = {
 112         .type           = "FIQDMA",
 113         .enable         = arc_floppy_data_enable_dma,
 114         .disable        = arc_disable_dma,
 115         .residue        = arc_floppy_data_get_dma_residue,
 116 };
 117
 118 static struct dma_ops arc_floppy_cmdend_dma_ops = {
 119         .type           = "FIQCMD",
 120         .enable         = arc_floppy_cmdend_enable_dma,
 121         .disable        = arc_disable_dma,
 122         .residue        = arc_floppy_cmdend_get_dma_residue,
 123 };
 124 #endif
 125
 126 #ifdef CONFIG_ARCH_A5K
 127 static struct fiq_handler fh = {
 128         .name   = "floppydata"
 129 };
 130
 131 static int a5k_floppy_get_dma_residue(dmach_t channel, dma_t *dma)
 132 {
 133         struct pt_regs regs;
 134         get_fiq_regs(&regs);
 135         return regs.ARM_r9;
 136 }
 137
 138 static void a5k_floppy_enable_dma(dmach_t channel, dma_t *dma)
 139 {
 140         struct pt_regs regs;
 141         void *fiqhandler_start;
 142         unsigned int fiqhandler_length;
 143         extern void floppy_fiqsetup(unsigned long len, unsigned long addr,
 144                                      unsigned long port);
 145
 146         if (dma->using_sg)
 147                 BUG();
 148
 149         if (dma->dma_mode == DMA_MODE_READ) {
 150                 extern unsigned char floppy_fiqin_start, floppy_fiqin_end;
 151                 fiqhandler_start = &floppy_fiqin_start;
 152                 fiqhandler_length = &floppy_fiqin_end - &floppy_fiqin_start;
 153         } else {
 154                 extern unsigned char floppy_fiqout_start, floppy_fiqout_end;
 155                 fiqhandler_start = &floppy_fiqout_start;
 156                 fiqhandler_length = &floppy_fiqout_end - &floppy_fiqout_start;
 157         }
 158         if (claim_fiq(&fh)) {
 159                 printk("floppydma: couldn't claim FIQ.\n");
 160                 return;
 161         }
 162         memcpy((void *)0x1c, fiqhandler_start, fiqhandler_length);
 163         regs.ARM_r9 = dma->buf.length;
 164         regs.ARM_r10 = (unsigned long)dma->buf.__address;
 165         regs.ARM_fp = FLOPPYDMA_BASE;
 166         set_fiq_regs(&regs);
 167         enable_fiq(dma->dma_irq);
 168 }
 169
 170 static void a5k_floppy_disable_dma(dmach_t channel, dma_t *dma)
 171 {
 172         disable_fiq(dma->dma_irq);
 173         release_fiq(&fh);
 174 }
 175
 176 static struct dma_ops a5k_floppy_dma_ops = {
 177         .type           = "FIQDMA",
 178         .enable         = a5k_floppy_enable_dma,
 179         .disable        = a5k_floppy_disable_dma,
 180         .residue        = a5k_floppy_get_dma_residue,
 181 };
 182 #endif
 183
 184 /*
 185  * This is virtual DMA - we don't need anything here
 186  */
 187 static void sound_enable_disable_dma(dmach_t channel, dma_t *dma)
 188 {
 189 }
 190
 191 static struct dma_ops sound_dma_ops = {
 192         .type           = "VIRTUAL",
 193         .enable         = sound_enable_disable_dma,
 194         .disable        = sound_enable_disable_dma,
 195 };
 196
 197 void __init arch_dma_init(dma_t *dma)
 198 {
 199 #if defined(CONFIG_BLK_DEV_FD1772) || defined(CONFIG_BLK_DEV_FD1772_MODULE)
 200         if (machine_is_archimedes()) {
 201                 dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
 202                 dma[DMA_VIRTUAL_FLOPPY0].d_ops   = &arc_floppy_data_dma_ops;
 203                 dma[DMA_VIRTUAL_FLOPPY1].dma_irq = 1;
 204                 dma[DMA_VIRTUAL_FLOPPY1].d_ops   = &arc_floppy_cmdend_dma_ops;
 205         }
 206 #endif
 207 #ifdef CONFIG_ARCH_A5K
 208         if (machine_is_a5k()) {
 209                 dma[DMA_VIRTUAL_FLOPPY0].dma_irq = FIQ_FLOPPYDATA;
 210                 dma[DMA_VIRTUAL_FLOPPY0].d_ops   = &a5k_floppy_dma_ops;
 211         }
 212 #endif
 213         dma[DMA_VIRTUAL_SOUND].d_ops = &sound_dma_ops;
 214 }