drivers/scsi/a2091.c

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