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 irqreturn_t a2091_intr (int irq, void *_instance)
  27 {
  28     unsigned long flags;
  29     unsigned int status;
  30     struct Scsi_Host *instance = (struct Scsi_Host *)_instance;
  31
  32     status = DMA(instance)->ISTR;
  33     if (!(status & (ISTR_INT_F|ISTR_INT_P)) || !(status & ISTR_INTS))
  34         return IRQ_NONE;
  35
  36     spin_lock_irqsave(instance->host_lock, flags);
  37     wd33c93_intr(instance);
  38     spin_unlock_irqrestore(instance->host_lock, flags);
  39     return IRQ_HANDLED;
  40 }
  41
  42 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
  43 {
  44     unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
  45     unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  46     struct Scsi_Host *instance = cmd->device->host;
  47
  48     /* don't allow DMA if the physical address is bad */
  49     if (addr & A2091_XFER_MASK)
  50     {
  51         HDATA(instance)->dma_bounce_len = (cmd->SCp.this_residual + 511)
  52             & ~0x1ff;
  53         HDATA(instance)->dma_bounce_buffer =
  54             kmalloc (HDATA(instance)->dma_bounce_len, GFP_KERNEL);
  55
  56         /* can't allocate memory; use PIO */
  57         if (!HDATA(instance)->dma_bounce_buffer) {
  58             HDATA(instance)->dma_bounce_len = 0;
  59             return 1;
  60         }
  61
  62         /* get the physical address of the bounce buffer */
  63         addr = virt_to_bus(HDATA(instance)->dma_bounce_buffer);
  64
  65         /* the bounce buffer may not be in the first 16M of physmem */
  66         if (addr & A2091_XFER_MASK) {
  67             /* we could use chipmem... maybe later */
  68             kfree (HDATA(instance)->dma_bounce_buffer);
  69             HDATA(instance)->dma_bounce_buffer = NULL;
  70             HDATA(instance)->dma_bounce_len = 0;
  71             return 1;
  72         }
  73
  74         if (!dir_in) {
  75                 /* copy to bounce buffer for a write */
  76                 memcpy (HDATA(instance)->dma_bounce_buffer,
  77                         cmd->SCp.ptr, cmd->SCp.this_residual);
  78         }
  79     }
  80
  81     /* setup dma direction */
  82     if (!dir_in)
  83         cntr |= CNTR_DDIR;
  84
  85     /* remember direction */
  86     HDATA(cmd->device->host)->dma_dir = dir_in;
  87
  88     DMA(cmd->device->host)->CNTR = cntr;
  89
  90     /* setup DMA *physical* address */
  91     DMA(cmd->device->host)->ACR = addr;
  92
  93     if (dir_in){
  94         /* invalidate any cache */
  95         cache_clear (addr, cmd->SCp.this_residual);
  96     }else{
  97         /* push any dirty cache */
  98         cache_push (addr, cmd->SCp.this_residual);
  99       }
 100     /* start DMA */
 101     DMA(cmd->device->host)->ST_DMA = 1;
 102
 103     /* return success */
 104     return 0;
 105 }
 106
 107 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 108                       int status)
 109 {
 110     /* disable SCSI interrupts */
 111     unsigned short cntr = CNTR_PDMD;
 112
 113     if (!HDATA(instance)->dma_dir)
 114             cntr |= CNTR_DDIR;
 115
 116     /* disable SCSI interrupts */
 117     DMA(instance)->CNTR = cntr;
 118
 119     /* flush if we were reading */
 120     if (HDATA(instance)->dma_dir) {
 121         DMA(instance)->FLUSH = 1;
 122         while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
 123             ;
 124     }
 125
 126     /* clear a possible interrupt */
 127     DMA(instance)->CINT = 1;
 128
 129     /* stop DMA */
 130     DMA(instance)->SP_DMA = 1;
 131
 132     /* restore the CONTROL bits (minus the direction flag) */
 133     DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 134
 135     /* copy from a bounce buffer, if necessary */
 136     if (status && HDATA(instance)->dma_bounce_buffer) {
 137         if( HDATA(instance)->dma_dir )
 138                 memcpy (SCpnt->SCp.ptr,
 139                         HDATA(instance)->dma_bounce_buffer,
 140                         SCpnt->SCp.this_residual);
 141         kfree (HDATA(instance)->dma_bounce_buffer);
 142         HDATA(instance)->dma_bounce_buffer = NULL;
 143         HDATA(instance)->dma_bounce_len = 0;
 144     }
 145 }
 146
 147 int __init a2091_detect(struct scsi_host_template *tpnt)
 148 {
 149     static unsigned char called = 0;
 150     struct Scsi_Host *instance;
 151     unsigned long address;
 152     struct zorro_dev *z = NULL;
 153     wd33c93_regs regs;
 154     int num_a2091 = 0;
 155
 156     if (!MACH_IS_AMIGA || called)
 157         return 0;
 158     called = 1;
 159
 160     tpnt->proc_name = "A2091";
 161     tpnt->proc_info = &wd33c93_proc_info;
 162
 163     while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 164         if (z->id != ZORRO_PROD_CBM_A590_A2091_1 &&
 165             z->id != ZORRO_PROD_CBM_A590_A2091_2)
 166             continue;
 167         address = z->resource.start;
 168         if (!request_mem_region(address, 256, "wd33c93"))
 169             continue;
 170
 171         instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));
 172         if (instance == NULL)
 173             goto release;
 174         instance->base = ZTWO_VADDR(address);
 175         instance->irq = IRQ_AMIGA_PORTS;
 176         instance->unique_id = z->slotaddr;
 177         DMA(instance)->DAWR = DAWR_A2091;
 178         regs.SASR = &(DMA(instance)->SASR);
 179         regs.SCMD = &(DMA(instance)->SCMD);
 180         HDATA(instance)->no_sync = 0xff;
 181         HDATA(instance)->fast = 0;
 182         HDATA(instance)->dma_mode = CTRL_DMA;
 183         wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
 184         if (request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED, "A2091 SCSI",
 185                         instance))
 186             goto unregister;
 187         DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 188         num_a2091++;
 189         continue;
 190
 191 unregister:
 192         scsi_unregister(instance);
 193         wd33c93_release();
 194 release:
 195         release_mem_region(address, 256);
 196     }
 197
 198     return num_a2091;
 199 }
 200
 201 static int a2091_bus_reset(struct scsi_cmnd *cmd)
 202 {
 203         /* FIXME perform bus-specific reset */
 204
 205         /* FIXME 2: kill this function, and let midlayer fall back
 206            to the same action, calling wd33c93_host_reset() */
 207
 208         spin_lock_irq(cmd->device->host->host_lock);
 209         wd33c93_host_reset(cmd);
 210         spin_unlock_irq(cmd->device->host->host_lock);
 211
 212         return SUCCESS;
 213 }
 214
 215 #define HOSTS_C
 216
 217 static struct scsi_host_template driver_template = {
 218         .proc_name              = "A2901",
 219         .name                   = "Commodore A2091/A590 SCSI",
 220         .detect                 = a2091_detect,
 221         .release                = a2091_release,
 222         .queuecommand           = wd33c93_queuecommand,
 223         .eh_abort_handler       = wd33c93_abort,
 224         .eh_bus_reset_handler   = a2091_bus_reset,
 225         .eh_host_reset_handler  = wd33c93_host_reset,
 226         .can_queue              = CAN_QUEUE,
 227         .this_id                = 7,
 228         .sg_tablesize           = SG_ALL,
 229         .cmd_per_lun            = CMD_PER_LUN,
 230         .use_clustering         = DISABLE_CLUSTERING
 231 };
 232
 233
 234 #include "scsi_module.c"
 235
 236 int a2091_release(struct Scsi_Host *instance)
 237 {
 238 #ifdef MODULE
 239         DMA(instance)->CNTR = 0;
 240         release_mem_region(ZTWO_PADDR(instance->base), 256);
 241         free_irq(IRQ_AMIGA_PORTS, instance);
 242         wd33c93_release();
 243 #endif
 244         return 1;
 245 }
 246
 247 MODULE_LICENSE("GPL");