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