drivers/scsi/a2091.c

   1 #include <linux/types.h>
   2 #include <linux/mm.h>
   3 #include <linux/blk.h>
   4 #include <linux/sched.h>
   5 #include <linux/version.h>
   6 #include <linux/init.h>
   7
   8 #include <asm/setup.h>
   9 #include <asm/page.h>
  10 #include <asm/pgtable.h>
  11 #include <asm/amigaints.h>
  12 #include <asm/amigahw.h>
  13 #include <linux/zorro.h>
  14 #include <asm/irq.h>
  15 #include <linux/spinlock.h>
  16
  17 #include "scsi.h"
  18 #include "hosts.h"
  19 #include "wd33c93.h"
  20 #include "a2091.h"
  21
  22 #include<linux/stat.h>
  23
  24 #define DMA(ptr) ((a2091_scsiregs *)((ptr)->base))
  25 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
  26
  27 static struct Scsi_Host *first_instance = NULL;
  28 static Scsi_Host_Template *a2091_template;
  29
  30 static void a2091_intr (int irq, void *dummy, struct pt_regs *fp)
  31 {
  32     unsigned long flags;
  33     unsigned int status;
  34     struct Scsi_Host *instance;
  35     for (instance = first_instance; instance &&
  36          instance->hostt == a2091_template; instance = instance->next)
  37     {
  38         status = DMA(instance)->ISTR;
  39         if (!(status & (ISTR_INT_F|ISTR_INT_P)))
  40                 continue;
  41
  42         if (status & ISTR_INTS) {
  43                 spin_lock_irqsave(&io_request_lock, flags);
  44                 wd33c93_intr (instance);
  45                 spin_unlock_irqrestore(&io_request_lock, flags);
  46         }
  47     }
  48 }
  49
  50 static int dma_setup (Scsi_Cmnd *cmd, int dir_in)
  51 {
  52     unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
  53     unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  54     struct Scsi_Host *instance = cmd->host;
  55
  56     /* don't allow DMA if the physical address is bad */
  57     if (addr & A2091_XFER_MASK ||
  58         (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
  59     {
  60         HDATA(instance)->dma_bounce_len = (cmd->SCp.this_residual + 511)
  61             & ~0x1ff;
  62         HDATA(instance)->dma_bounce_buffer =
  63             scsi_malloc (HDATA(instance)->dma_bounce_len);
  64
  65         /* can't allocate memory; use PIO */
  66         if (!HDATA(instance)->dma_bounce_buffer) {
  67             HDATA(instance)->dma_bounce_len = 0;
  68             return 1;
  69         }
  70
  71         /* get the physical address of the bounce buffer */
  72         addr = virt_to_bus(HDATA(instance)->dma_bounce_buffer);
  73
  74         /* the bounce buffer may not be in the first 16M of physmem */
  75         if (addr & A2091_XFER_MASK) {
  76             /* we could use chipmem... maybe later */
  77             scsi_free (HDATA(instance)->dma_bounce_buffer,
  78                        HDATA(instance)->dma_bounce_len);
  79             HDATA(instance)->dma_bounce_buffer = NULL;
  80             HDATA(instance)->dma_bounce_len = 0;
  81             return 1;
  82         }
  83
  84         if (!dir_in) {
  85             /* copy to bounce buffer for a write */
  86             if (cmd->use_sg)
  87 #if 0
  88                 panic ("scsi%ddma: incomplete s/g support",
  89                        instance->host_no);
  90 #else
  91                 memcpy (HDATA(instance)->dma_bounce_buffer,
  92                         cmd->SCp.ptr, cmd->SCp.this_residual);
  93 #endif
  94             else
  95                 memcpy (HDATA(instance)->dma_bounce_buffer,
  96                         cmd->request_buffer, cmd->request_bufflen);
  97         }
  98     }
  99
 100     /* setup dma direction */
 101     if (!dir_in)
 102         cntr |= CNTR_DDIR;
 103
 104     /* remember direction */
 105     HDATA(cmd->host)->dma_dir = dir_in;
 106
 107     DMA(cmd->host)->CNTR = cntr;
 108
 109     /* setup DMA *physical* address */
 110     DMA(cmd->host)->ACR = addr;
 111
 112     if (dir_in){
 113         /* invalidate any cache */
 114         cache_clear (addr, cmd->SCp.this_residual);
 115     }else{
 116         /* push any dirty cache */
 117         cache_push (addr, cmd->SCp.this_residual);
 118       }
 119     /* start DMA */
 120     DMA(cmd->host)->ST_DMA = 1;
 121
 122     /* return success */
 123     return 0;
 124 }
 125
 126 static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt,
 127                       int status)
 128 {
 129     /* disable SCSI interrupts */
 130     unsigned short cntr = CNTR_PDMD;
 131
 132     if (!HDATA(instance)->dma_dir)
 133             cntr |= CNTR_DDIR;
 134
 135     /* disable SCSI interrupts */
 136     DMA(instance)->CNTR = cntr;
 137
 138     /* flush if we were reading */
 139     if (HDATA(instance)->dma_dir) {
 140         DMA(instance)->FLUSH = 1;
 141         while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
 142             ;
 143     }
 144
 145     /* clear a possible interrupt */
 146     DMA(instance)->CINT = 1;
 147
 148     /* stop DMA */
 149     DMA(instance)->SP_DMA = 1;
 150
 151     /* restore the CONTROL bits (minus the direction flag) */
 152     DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 153
 154     /* copy from a bounce buffer, if necessary */
 155     if (status && HDATA(instance)->dma_bounce_buffer) {
 156         if (SCpnt && SCpnt->use_sg) {
 157 #if 0
 158             panic ("scsi%d: incomplete s/g support",
 159                    instance->host_no);
 160 #else
 161             if( HDATA(instance)->dma_dir )
 162                 memcpy (SCpnt->SCp.ptr,
 163                         HDATA(instance)->dma_bounce_buffer,
 164                         SCpnt->SCp.this_residual);
 165             scsi_free (HDATA(instance)->dma_bounce_buffer,
 166                        HDATA(instance)->dma_bounce_len);
 167             HDATA(instance)->dma_bounce_buffer = NULL;
 168             HDATA(instance)->dma_bounce_len = 0;
 169
 170 #endif
 171         } else {
 172             if (HDATA(instance)->dma_dir && SCpnt)
 173                 memcpy (SCpnt->request_buffer,
 174                         HDATA(instance)->dma_bounce_buffer,
 175                         SCpnt->request_bufflen);
 176
 177             scsi_free (HDATA(instance)->dma_bounce_buffer,
 178                        HDATA(instance)->dma_bounce_len);
 179             HDATA(instance)->dma_bounce_buffer = NULL;
 180             HDATA(instance)->dma_bounce_len = 0;
 181         }
 182     }
 183 }
 184
 185 static int num_a2091 = 0;
 186
 187 int __init a2091_detect(Scsi_Host_Template *tpnt)
 188 {
 189     static unsigned char called = 0;
 190     struct Scsi_Host *instance;
 191     unsigned long address;
 192     struct zorro_dev *z = NULL;
 193
 194     if (!MACH_IS_AMIGA || called)
 195         return 0;
 196     called = 1;
 197
 198     tpnt->proc_name = "A2091";
 199     tpnt->proc_info = &wd33c93_proc_info;
 200
 201     while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 202         if (z->id != ZORRO_PROD_CBM_A590_A2091_1 &&
 203             z->id != ZORRO_PROD_CBM_A590_A2091_2)
 204             continue;
 205         address = z->resource.start;
 206         if (!request_mem_region(address, 256, "wd33c93"))
 207             continue;
 208
 209         instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));
 210         if (instance == NULL) {
 211             release_mem_region(address, 256);
 212             continue;
 213         }
 214         instance->base = ZTWO_VADDR(address);
 215         instance->irq = IRQ_AMIGA_PORTS;
 216         instance->unique_id = z->slotaddr;
 217         DMA(instance)->DAWR = DAWR_A2091;
 218         wd33c93_init(instance, (wd33c93_regs *)&(DMA(instance)->SASR),
 219                      dma_setup, dma_stop, WD33C93_FS_8_10);
 220         if (num_a2091++ == 0) {
 221             first_instance = instance;
 222             a2091_template = instance->hostt;
 223             request_irq(IRQ_AMIGA_PORTS, a2091_intr, SA_SHIRQ, "A2091 SCSI",
 224                         a2091_intr);
 225         }
 226         DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 227     }
 228
 229     return num_a2091;
 230 }
 231
 232 #define HOSTS_C
 233
 234 static Scsi_Host_Template driver_template = A2091_SCSI;
 235
 236 #include "scsi_module.c"
 237
 238 int a2091_release(struct Scsi_Host *instance)
 239 {
 240 #ifdef MODULE
 241         DMA(instance)->CNTR = 0;
 242         release_mem_region(ZTWO_PADDR(instance->base), 256);
 243         if (--num_a2091 == 0)
 244                 free_irq(IRQ_AMIGA_PORTS, a2091_intr);
 245         wd33c93_release();
 246 #endif
 247         return 1;
 248 }