drivers/scsi/a2091.c

   1 #include <linux/types.h>
   2 #include <linux/mm.h>
   3 #include <linux/blkdev.h>
   4 #include <linux/sched.h>
   5 #include <linux/init.h>
   6 #include <linux/interrupt.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 <scsi/scsi_host.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 irqreturn_t a2091_intr (int irq, void *_instance, struct pt_regs *fp)
  28 {
  29     unsigned long flags;
  30     unsigned int status;
  31     struct Scsi_Host *instance = (struct Scsi_Host *)_instance;
  32
  33     status = DMA(instance)->ISTR;
  34     if (!(status & (ISTR_INT_F|ISTR_INT_P)) || !(status & ISTR_INTS))
  35         return IRQ_NONE;
  36
  37     spin_lock_irqsave(instance->host_lock, flags);
  38     wd33c93_intr(instance);
  39     spin_unlock_irqrestore(instance->host_lock, flags);
  40     return IRQ_HANDLED;
  41 }
  42
  43 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
  44 {
  45     unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
  46     unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  47     struct Scsi_Host *instance = cmd->device->host;
  48
  49     /* don't allow DMA if the physical address is bad */
  50     if (addr & A2091_XFER_MASK ||
  51         (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
  52     {
  53         HDATA(instance)->dma_bounce_len = (cmd->SCp.this_residual + 511)
  54             & ~0x1ff;
  55         HDATA(instance)->dma_bounce_buffer =
  56             kmalloc (HDATA(instance)->dma_bounce_len, GFP_KERNEL);
  57
  58         /* can't allocate memory; use PIO */
  59         if (!HDATA(instance)->dma_bounce_buffer) {
  60             HDATA(instance)->dma_bounce_len = 0;
  61             return 1;
  62         }
  63
  64         /* get the physical address of the bounce buffer */
  65         addr = virt_to_bus(HDATA(instance)->dma_bounce_buffer);
  66
  67         /* the bounce buffer may not be in the first 16M of physmem */
  68         if (addr & A2091_XFER_MASK) {
  69             /* we could use chipmem... maybe later */
  70             kfree (HDATA(instance)->dma_bounce_buffer);
  71             HDATA(instance)->dma_bounce_buffer = NULL;
  72             HDATA(instance)->dma_bounce_len = 0;
  73             return 1;
  74         }
  75
  76         if (!dir_in) {
  77             /* copy to bounce buffer for a write */
  78             if (cmd->use_sg)
  79 #if 0
  80                 panic ("scsi%ddma: incomplete s/g support",
  81                        instance->host_no);
  82 #else
  83                 memcpy (HDATA(instance)->dma_bounce_buffer,
  84                         cmd->SCp.ptr, cmd->SCp.this_residual);
  85 #endif
  86             else
  87                 memcpy (HDATA(instance)->dma_bounce_buffer,
  88                         cmd->request_buffer, cmd->request_bufflen);
  89         }
  90     }
  91
  92     /* setup dma direction */
  93     if (!dir_in)
  94         cntr |= CNTR_DDIR;
  95
  96     /* remember direction */
  97     HDATA(cmd->device->host)->dma_dir = dir_in;
  98
  99     DMA(cmd->device->host)->CNTR = cntr;
 100
 101     /* setup DMA *physical* address */
 102     DMA(cmd->device->host)->ACR = addr;
 103
 104     if (dir_in){
 105         /* invalidate any cache */
 106         cache_clear (addr, cmd->SCp.this_residual);
 107     }else{
 108         /* push any dirty cache */
 109         cache_push (addr, cmd->SCp.this_residual);
 110       }
 111     /* start DMA */
 112     DMA(cmd->device->host)->ST_DMA = 1;
 113
 114     /* return success */
 115     return 0;
 116 }
 117
 118 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 119                       int status)
 120 {
 121     /* disable SCSI interrupts */
 122     unsigned short cntr = CNTR_PDMD;
 123
 124     if (!HDATA(instance)->dma_dir)
 125             cntr |= CNTR_DDIR;
 126
 127     /* disable SCSI interrupts */
 128     DMA(instance)->CNTR = cntr;
 129
 130     /* flush if we were reading */
 131     if (HDATA(instance)->dma_dir) {
 132         DMA(instance)->FLUSH = 1;
 133         while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
 134             ;
 135     }
 136
 137     /* clear a possible interrupt */
 138     DMA(instance)->CINT = 1;
 139
 140     /* stop DMA */
 141     DMA(instance)->SP_DMA = 1;
 142
 143     /* restore the CONTROL bits (minus the direction flag) */
 144     DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 145
 146     /* copy from a bounce buffer, if necessary */
 147     if (status && HDATA(instance)->dma_bounce_buffer) {
 148         if (SCpnt && SCpnt->use_sg) {
 149 #if 0
 150             panic ("scsi%d: incomplete s/g support",
 151                    instance->host_no);
 152 #else
 153             if( HDATA(instance)->dma_dir )
 154                 memcpy (SCpnt->SCp.ptr,
 155                         HDATA(instance)->dma_bounce_buffer,
 156                         SCpnt->SCp.this_residual);
 157             kfree (HDATA(instance)->dma_bounce_buffer);
 158             HDATA(instance)->dma_bounce_buffer = NULL;
 159             HDATA(instance)->dma_bounce_len = 0;
 160
 161 #endif
 162         } else {
 163             if (HDATA(instance)->dma_dir && SCpnt)
 164                 memcpy (SCpnt->request_buffer,
 165                         HDATA(instance)->dma_bounce_buffer,
 166                         SCpnt->request_bufflen);
 167
 168             kfree (HDATA(instance)->dma_bounce_buffer);
 169             HDATA(instance)->dma_bounce_buffer = NULL;
 170             HDATA(instance)->dma_bounce_len = 0;
 171         }
 172     }
 173 }
 174
 175 int __init a2091_detect(struct scsi_host_template *tpnt)
 176 {
 177     static unsigned char called = 0;
 178     struct Scsi_Host *instance;
 179     unsigned long address;
 180     struct zorro_dev *z = NULL;
 181     wd33c93_regs regs;
 182     int num_a2091 = 0;
 183
 184     if (!MACH_IS_AMIGA || called)
 185         return 0;
 186     called = 1;
 187
 188     tpnt->proc_name = "A2091";
 189     tpnt->proc_info = &wd33c93_proc_info;
 190
 191     while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 192         if (z->id != ZORRO_PROD_CBM_A590_A2091_1 &&
 193             z->id != ZORRO_PROD_CBM_A590_A2091_2)
 194             continue;
 195         address = z->resource.start;
 196         if (!request_mem_region(address, 256, "wd33c93"))
 197             continue;
 198
 199         instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));
 200         if (instance == NULL) {
 201             release_mem_region(address, 256);
 202             continue;
 203         }
 204         instance->base = ZTWO_VADDR(address);
 205         instance->irq = IRQ_AMIGA_PORTS;
 206         instance->unique_id = z->slotaddr;
 207         DMA(instance)->DAWR = DAWR_A2091;
 208         regs.SASR = &(DMA(instance)->SASR);
 209         regs.SCMD = &(DMA(instance)->SCMD);
 210         wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
 211         request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED, "A2091 SCSI",
 212                     instance);
 213         DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 214         num_a2091++;
 215     }
 216
 217     return num_a2091;
 218 }
 219
 220 static int a2091_bus_reset(struct scsi_cmnd *cmd)
 221 {
 222         /* FIXME perform bus-specific reset */
 223
 224         /* FIXME 2: kill this function, and let midlayer fall back
 225            to the same action, calling wd33c93_host_reset() */
 226
 227         spin_lock_irq(cmd->device->host->host_lock);
 228         wd33c93_host_reset(cmd);
 229         spin_unlock_irq(cmd->device->host->host_lock);
 230
 231         return SUCCESS;
 232 }
 233
 234 #define HOSTS_C
 235
 236 static struct scsi_host_template driver_template = {
 237         .proc_name              = "A2901",
 238         .name                   = "Commodore A2091/A590 SCSI",
 239         .detect                 = a2091_detect,
 240         .release                = a2091_release,
 241         .queuecommand           = wd33c93_queuecommand,
 242         .eh_abort_handler       = wd33c93_abort,
 243         .eh_bus_reset_handler   = a2091_bus_reset,
 244         .eh_host_reset_handler  = wd33c93_host_reset,
 245         .can_queue              = CAN_QUEUE,
 246         .this_id                = 7,
 247         .sg_tablesize           = SG_ALL,
 248         .cmd_per_lun            = CMD_PER_LUN,
 249         .use_clustering         = DISABLE_CLUSTERING
 250 };
 251
 252
 253 #include "scsi_module.c"
 254
 255 int a2091_release(struct Scsi_Host *instance)
 256 {
 257 #ifdef MODULE
 258         DMA(instance)->CNTR = 0;
 259         release_mem_region(ZTWO_PADDR(instance->base), 256);
 260         free_irq(IRQ_AMIGA_PORTS, instance);
 261         wd33c93_release();
 262 #endif
 263         return 1;
 264 }
 265
 266 MODULE_LICENSE("GPL");