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/version.h>
   6 #include <linux/init.h>
   7 #include <linux/interrupt.h>
   8
   9 #include <asm/setup.h>
  10 #include <asm/page.h>
  11 #include <asm/pgtable.h>
  12 #include <asm/amigaints.h>
  13 #include <asm/amigahw.h>
  14 #include <linux/zorro.h>
  15 #include <asm/irq.h>
  16 #include <linux/spinlock.h>
  17
  18 #include "scsi.h"
  19 #include <scsi/scsi_host.h>
  20 #include "wd33c93.h"
  21 #include "a2091.h"
  22
  23 #include<linux/stat.h>
  24
  25 #define DMA(ptr) ((a2091_scsiregs *)((ptr)->base))
  26 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
  27
  28 static irqreturn_t a2091_intr (int irq, void *_instance, struct pt_regs *fp)
  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 (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         (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
  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             if (cmd->use_sg)
  80 #if 0
  81                 panic ("scsi%ddma: incomplete s/g support",
  82                        instance->host_no);
  83 #else
  84                 memcpy (HDATA(instance)->dma_bounce_buffer,
  85                         cmd->SCp.ptr, cmd->SCp.this_residual);
  86 #endif
  87             else
  88                 memcpy (HDATA(instance)->dma_bounce_buffer,
  89                         cmd->request_buffer, cmd->request_bufflen);
  90         }
  91     }
  92
  93     /* setup dma direction */
  94     if (!dir_in)
  95         cntr |= CNTR_DDIR;
  96
  97     /* remember direction */
  98     HDATA(cmd->device->host)->dma_dir = dir_in;
  99
 100     DMA(cmd->device->host)->CNTR = cntr;
 101
 102     /* setup DMA *physical* address */
 103     DMA(cmd->device->host)->ACR = addr;
 104
 105     if (dir_in){
 106         /* invalidate any cache */
 107         cache_clear (addr, cmd->SCp.this_residual);
 108     }else{
 109         /* push any dirty cache */
 110         cache_push (addr, cmd->SCp.this_residual);
 111       }
 112     /* start DMA */
 113     DMA(cmd->device->host)->ST_DMA = 1;
 114
 115     /* return success */
 116     return 0;
 117 }
 118
 119 static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt,
 120                       int status)
 121 {
 122     /* disable SCSI interrupts */
 123     unsigned short cntr = CNTR_PDMD;
 124
 125     if (!HDATA(instance)->dma_dir)
 126             cntr |= CNTR_DDIR;
 127
 128     /* disable SCSI interrupts */
 129     DMA(instance)->CNTR = cntr;
 130
 131     /* flush if we were reading */
 132     if (HDATA(instance)->dma_dir) {
 133         DMA(instance)->FLUSH = 1;
 134         while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
 135             ;
 136     }
 137
 138     /* clear a possible interrupt */
 139     DMA(instance)->CINT = 1;
 140
 141     /* stop DMA */
 142     DMA(instance)->SP_DMA = 1;
 143
 144     /* restore the CONTROL bits (minus the direction flag) */
 145     DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 146
 147     /* copy from a bounce buffer, if necessary */
 148     if (status && HDATA(instance)->dma_bounce_buffer) {
 149         if (SCpnt && SCpnt->use_sg) {
 150 #if 0
 151             panic ("scsi%d: incomplete s/g support",
 152                    instance->host_no);
 153 #else
 154             if( HDATA(instance)->dma_dir )
 155                 memcpy (SCpnt->SCp.ptr,
 156                         HDATA(instance)->dma_bounce_buffer,
 157                         SCpnt->SCp.this_residual);
 158             kfree (HDATA(instance)->dma_bounce_buffer);
 159             HDATA(instance)->dma_bounce_buffer = NULL;
 160             HDATA(instance)->dma_bounce_len = 0;
 161
 162 #endif
 163         } else {
 164             if (HDATA(instance)->dma_dir && SCpnt)
 165                 memcpy (SCpnt->request_buffer,
 166                         HDATA(instance)->dma_bounce_buffer,
 167                         SCpnt->request_bufflen);
 168
 169             kfree (HDATA(instance)->dma_bounce_buffer);
 170             HDATA(instance)->dma_bounce_buffer = NULL;
 171             HDATA(instance)->dma_bounce_len = 0;
 172         }
 173     }
 174 }
 175
 176 int __init a2091_detect(Scsi_Host_Template *tpnt)
 177 {
 178     static unsigned char called = 0;
 179     struct Scsi_Host *instance;
 180     unsigned long address;
 181     struct zorro_dev *z = NULL;
 182     wd33c93_regs regs;
 183     int num_a2091 = 0;
 184
 185     if (!MACH_IS_AMIGA || called)
 186         return 0;
 187     called = 1;
 188
 189     tpnt->proc_name = "A2091";
 190     tpnt->proc_info = &wd33c93_proc_info;
 191
 192     while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 193         if (z->id != ZORRO_PROD_CBM_A590_A2091_1 &&
 194             z->id != ZORRO_PROD_CBM_A590_A2091_2)
 195             continue;
 196         address = z->resource.start;
 197         if (!request_mem_region(address, 256, "wd33c93"))
 198             continue;
 199
 200         instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));
 201         if (instance == NULL) {
 202             release_mem_region(address, 256);
 203             continue;
 204         }
 205         instance->base = ZTWO_VADDR(address);
 206         instance->irq = IRQ_AMIGA_PORTS;
 207         instance->unique_id = z->slotaddr;
 208         DMA(instance)->DAWR = DAWR_A2091;
 209         regs.SASR = &(DMA(instance)->SASR);
 210         regs.SCMD = &(DMA(instance)->SCMD);
 211         wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
 212         request_irq(IRQ_AMIGA_PORTS, a2091_intr, SA_SHIRQ, "A2091 SCSI",
 213                     instance);
 214         DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 215         num_a2091++;
 216     }
 217
 218     return num_a2091;
 219 }
 220
 221 static int a2091_bus_reset(Scsi_Cmnd *cmd)
 222 {
 223         /* FIXME perform bus-specific reset */
 224
 225         /* FIXME 2: kill this function, and let midlayer fall back
 226            to the same action, calling wd33c93_host_reset() */
 227
 228         spin_lock_irq(cmd->device->host->host_lock);
 229         wd33c93_host_reset(cmd);
 230         spin_unlock_irq(cmd->device->host->host_lock);
 231
 232         return SUCCESS;
 233 }
 234
 235 #define HOSTS_C
 236
 237 static Scsi_Host_Template driver_template = {
 238         .proc_name              = "A2901",
 239         .name                   = "Commodore A2091/A590 SCSI",
 240         .detect                 = a2091_detect,
 241         .release                = a2091_release,
 242         .queuecommand           = wd33c93_queuecommand,
 243         .eh_abort_handler       = wd33c93_abort,
 244         .eh_bus_reset_handler   = a2091_bus_reset,
 245         .eh_host_reset_handler  = wd33c93_host_reset,
 246         .can_queue              = CAN_QUEUE,
 247         .this_id                = 7,
 248         .sg_tablesize           = SG_ALL,
 249         .cmd_per_lun            = CMD_PER_LUN,
 250         .use_clustering         = DISABLE_CLUSTERING
 251 };
 252
 253
 254 #include "scsi_module.c"
 255
 256 int a2091_release(struct Scsi_Host *instance)
 257 {
 258 #ifdef MODULE
 259         DMA(instance)->CNTR = 0;
 260         release_mem_region(ZTWO_PADDR(instance->base), 256);
 261         free_irq(IRQ_AMIGA_PORTS, instance);
 262         wd33c93_release();
 263 #endif
 264         return 1;
 265 }
 266
 267 MODULE_LICENSE("GPL");