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                 memcpy (HDATA(instance)->dma_bounce_buffer,
  78                         cmd->SCp.ptr, cmd->SCp.this_residual);
  79         }
  80     }
  81
  82     /* setup dma direction */
  83     if (!dir_in)
  84         cntr |= CNTR_DDIR;
  85
  86     /* remember direction */
  87     HDATA(cmd->device->host)->dma_dir = dir_in;
  88
  89     DMA(cmd->device->host)->CNTR = cntr;
  90
  91     /* setup DMA *physical* address */
  92     DMA(cmd->device->host)->ACR = addr;
  93
  94     if (dir_in){
  95         /* invalidate any cache */
  96         cache_clear (addr, cmd->SCp.this_residual);
  97     }else{
  98         /* push any dirty cache */
  99         cache_push (addr, cmd->SCp.this_residual);
 100       }
 101     /* start DMA */
 102     DMA(cmd->device->host)->ST_DMA = 1;
 103
 104     /* return success */
 105     return 0;
 106 }
 107
 108 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 109                       int status)
 110 {
 111     /* disable SCSI interrupts */
 112     unsigned short cntr = CNTR_PDMD;
 113
 114     if (!HDATA(instance)->dma_dir)
 115             cntr |= CNTR_DDIR;
 116
 117     /* disable SCSI interrupts */
 118     DMA(instance)->CNTR = cntr;
 119
 120     /* flush if we were reading */
 121     if (HDATA(instance)->dma_dir) {
 122         DMA(instance)->FLUSH = 1;
 123         while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
 124             ;
 125     }
 126
 127     /* clear a possible interrupt */
 128     DMA(instance)->CINT = 1;
 129
 130     /* stop DMA */
 131     DMA(instance)->SP_DMA = 1;
 132
 133     /* restore the CONTROL bits (minus the direction flag) */
 134     DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 135
 136     /* copy from a bounce buffer, if necessary */
 137     if (status && HDATA(instance)->dma_bounce_buffer) {
 138         if( HDATA(instance)->dma_dir )
 139                 memcpy (SCpnt->SCp.ptr,
 140                         HDATA(instance)->dma_bounce_buffer,
 141                         SCpnt->SCp.this_residual);
 142         kfree (HDATA(instance)->dma_bounce_buffer);
 143         HDATA(instance)->dma_bounce_buffer = NULL;
 144         HDATA(instance)->dma_bounce_len = 0;
 145     }
 146 }
 147
 148 int __init a2091_detect(struct scsi_host_template *tpnt)
 149 {
 150     static unsigned char called = 0;
 151     struct Scsi_Host *instance;
 152     unsigned long address;
 153     struct zorro_dev *z = NULL;
 154     wd33c93_regs regs;
 155     int num_a2091 = 0;
 156
 157     if (!MACH_IS_AMIGA || called)
 158         return 0;
 159     called = 1;
 160
 161     tpnt->proc_name = "A2091";
 162     tpnt->proc_info = &wd33c93_proc_info;
 163
 164     while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 165         if (z->id != ZORRO_PROD_CBM_A590_A2091_1 &&
 166             z->id != ZORRO_PROD_CBM_A590_A2091_2)
 167             continue;
 168         address = z->resource.start;
 169         if (!request_mem_region(address, 256, "wd33c93"))
 170             continue;
 171
 172         instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));
 173         if (instance == NULL) {
 174             release_mem_region(address, 256);
 175             continue;
 176         }
 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         wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
 184         request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED, "A2091 SCSI",
 185                     instance);
 186         DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 187         num_a2091++;
 188     }
 189
 190     return num_a2091;
 191 }
 192
 193 static int a2091_bus_reset(struct scsi_cmnd *cmd)
 194 {
 195         /* FIXME perform bus-specific reset */
 196
 197         /* FIXME 2: kill this function, and let midlayer fall back
 198            to the same action, calling wd33c93_host_reset() */
 199
 200         spin_lock_irq(cmd->device->host->host_lock);
 201         wd33c93_host_reset(cmd);
 202         spin_unlock_irq(cmd->device->host->host_lock);
 203
 204         return SUCCESS;
 205 }
 206
 207 #define HOSTS_C
 208
 209 static struct scsi_host_template driver_template = {
 210         .proc_name              = "A2901",
 211         .name                   = "Commodore A2091/A590 SCSI",
 212         .detect                 = a2091_detect,
 213         .release                = a2091_release,
 214         .queuecommand           = wd33c93_queuecommand,
 215         .eh_abort_handler       = wd33c93_abort,
 216         .eh_bus_reset_handler   = a2091_bus_reset,
 217         .eh_host_reset_handler  = wd33c93_host_reset,
 218         .can_queue              = CAN_QUEUE,
 219         .this_id                = 7,
 220         .sg_tablesize           = SG_ALL,
 221         .cmd_per_lun            = CMD_PER_LUN,
 222         .use_clustering         = DISABLE_CLUSTERING
 223 };
 224
 225
 226 #include "scsi_module.c"
 227
 228 int a2091_release(struct Scsi_Host *instance)
 229 {
 230 #ifdef MODULE
 231         DMA(instance)->CNTR = 0;
 232         release_mem_region(ZTWO_PADDR(instance->base), 256);
 233         free_irq(IRQ_AMIGA_PORTS, instance);
 234         wd33c93_release();
 235 #endif
 236         return 1;
 237 }
 238
 239 MODULE_LICENSE("GPL");