drivers/scsi/a2091.c

   1 #include <linux/types.h>
   2 #include <linux/mm.h>
   3 #include <linux/blkdev.h>
   4 #include <linux/init.h>
   5 #include <linux/interrupt.h>
   6
   7 #include <asm/setup.h>
   8 #include <asm/page.h>
   9 #include <asm/pgtable.h>
  10 #include <asm/amigaints.h>
  11 #include <asm/amigahw.h>
  12 #include <linux/zorro.h>
  13 #include <asm/irq.h>
  14 #include <linux/spinlock.h>
  15
  16 #include "scsi.h"
  17 #include <scsi/scsi_host.h>
  18 #include "wd33c93.h"
  19 #include "a2091.h"
  20
  21 #include<linux/stat.h>
  22
  23 #define DMA(ptr) ((a2091_scsiregs *)((ptr)->base))
  24 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
  25
  26 static int a2091_release(struct Scsi_Host *instance);
  27
  28 static irqreturn_t a2091_intr (int irq, void *_instance)
  29 {
  30     unsigned long flags;
  31     unsigned int status;
  32     struct Scsi_Host *instance = (struct Scsi_Host *)_instance;
  33
  34     status = DMA(instance)->ISTR;
  35     if (!(status & (ISTR_INT_F|ISTR_INT_P)) || !(status & ISTR_INTS))
  36         return IRQ_NONE;
  37
  38     spin_lock_irqsave(instance->host_lock, flags);
  39     wd33c93_intr(instance);
  40     spin_unlock_irqrestore(instance->host_lock, flags);
  41     return IRQ_HANDLED;
  42 }
  43
  44 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
  45 {
  46     unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
  47     unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  48     struct Scsi_Host *instance = cmd->device->host;
  49
  50     /* don't allow DMA if the physical address is bad */
  51     if (addr & A2091_XFER_MASK)
  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                 memcpy (HDATA(instance)->dma_bounce_buffer,
  79                         cmd->SCp.ptr, cmd->SCp.this_residual);
  80         }
  81     }
  82
  83     /* setup dma direction */
  84     if (!dir_in)
  85         cntr |= CNTR_DDIR;
  86
  87     /* remember direction */
  88     HDATA(cmd->device->host)->dma_dir = dir_in;
  89
  90     DMA(cmd->device->host)->CNTR = cntr;
  91
  92     /* setup DMA *physical* address */
  93     DMA(cmd->device->host)->ACR = addr;
  94
  95     if (dir_in){
  96         /* invalidate any cache */
  97         cache_clear (addr, cmd->SCp.this_residual);
  98     }else{
  99         /* push any dirty cache */
 100         cache_push (addr, cmd->SCp.this_residual);
 101       }
 102     /* start DMA */
 103     DMA(cmd->device->host)->ST_DMA = 1;
 104
 105     /* return success */
 106     return 0;
 107 }
 108
 109 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 110                       int status)
 111 {
 112     /* disable SCSI interrupts */
 113     unsigned short cntr = CNTR_PDMD;
 114
 115     if (!HDATA(instance)->dma_dir)
 116             cntr |= CNTR_DDIR;
 117
 118     /* disable SCSI interrupts */
 119     DMA(instance)->CNTR = cntr;
 120
 121     /* flush if we were reading */
 122     if (HDATA(instance)->dma_dir) {
 123         DMA(instance)->FLUSH = 1;
 124         while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
 125             ;
 126     }
 127
 128     /* clear a possible interrupt */
 129     DMA(instance)->CINT = 1;
 130
 131     /* stop DMA */
 132     DMA(instance)->SP_DMA = 1;
 133
 134     /* restore the CONTROL bits (minus the direction flag) */
 135     DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 136
 137     /* copy from a bounce buffer, if necessary */
 138     if (status && HDATA(instance)->dma_bounce_buffer) {
 139         if( HDATA(instance)->dma_dir )
 140                 memcpy (SCpnt->SCp.ptr,
 141                         HDATA(instance)->dma_bounce_buffer,
 142                         SCpnt->SCp.this_residual);
 143         kfree (HDATA(instance)->dma_bounce_buffer);
 144         HDATA(instance)->dma_bounce_buffer = NULL;
 145         HDATA(instance)->dma_bounce_len = 0;
 146     }
 147 }
 148
 149 static int __init a2091_detect(struct scsi_host_template *tpnt)
 150 {
 151     static unsigned char called = 0;
 152     struct Scsi_Host *instance;
 153     unsigned long address;
 154     struct zorro_dev *z = NULL;
 155     wd33c93_regs regs;
 156     int num_a2091 = 0;
 157
 158     if (!MACH_IS_AMIGA || called)
 159         return 0;
 160     called = 1;
 161
 162     tpnt->proc_name = "A2091";
 163     tpnt->proc_info = &wd33c93_proc_info;
 164
 165     while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 166         if (z->id != ZORRO_PROD_CBM_A590_A2091_1 &&
 167             z->id != ZORRO_PROD_CBM_A590_A2091_2)
 168             continue;
 169         address = z->resource.start;
 170         if (!request_mem_region(address, 256, "wd33c93"))
 171             continue;
 172
 173         instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));
 174         if (instance == NULL)
 175             goto release;
 176         instance->base = ZTWO_VADDR(address);
 177         instance->irq = IRQ_AMIGA_PORTS;
 178         instance->unique_id = z->slotaddr;
 179         DMA(instance)->DAWR = DAWR_A2091;
 180         regs.SASR = &(DMA(instance)->SASR);
 181         regs.SCMD = &(DMA(instance)->SCMD);
 182         HDATA(instance)->no_sync = 0xff;
 183         HDATA(instance)->fast = 0;
 184         HDATA(instance)->dma_mode = CTRL_DMA;
 185         wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
 186         if (request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED, "A2091 SCSI",
 187                         instance))
 188             goto unregister;
 189         DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 190         num_a2091++;
 191         continue;
 192
 193 unregister:
 194         scsi_unregister(instance);
 195         wd33c93_release();
 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         wd33c93_release();
 245 #endif
 246         return 1;
 247 }
 248
 249 MODULE_LICENSE("GPL");