drivers/scsi/a2091.c

   1 #include <linux/types.h>
   2 #include <linux/mm.h>
   3 #include <linux/slab.h>
   4 #include <linux/blkdev.h>
   5 #include <linux/init.h>
   6 #include <linux/interrupt.h>
   7
   8 #include <asm/setup.h>
   9 #include <asm/page.h>
  10 #include <asm/pgtable.h>
  11 #include <asm/amigaints.h>
  12 #include <asm/amigahw.h>
  13 #include <linux/zorro.h>
  14 #include <asm/irq.h>
  15 #include <linux/spinlock.h>
  16
  17 #include "scsi.h"
  18 #include <scsi/scsi_host.h>
  19 #include "wd33c93.h"
  20 #include "a2091.h"
  21
  22 #include <linux/stat.h>
  23
  24
  25 static int a2091_release(struct Scsi_Host *instance);
  26
  27 static irqreturn_t a2091_intr(int irq, void *data)
  28 {
  29         struct Scsi_Host *instance = data;
  30         a2091_scsiregs *regs = (a2091_scsiregs *)(instance->base);
  31         unsigned int status = regs->ISTR;
  32         unsigned long flags;
  33
  34         if (!(status & (ISTR_INT_F | ISTR_INT_P)) || !(status & ISTR_INTS))
  35                 return IRQ_NONE;
  36
  37         spin_lock_irqsave(instance->host_lock, flags);
  38         wd33c93_intr(instance);
  39         spin_unlock_irqrestore(instance->host_lock, flags);
  40         return IRQ_HANDLED;
  41 }
  42
  43 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
  44 {
  45         struct Scsi_Host *instance = cmd->device->host;
  46         struct WD33C93_hostdata *hdata = shost_priv(instance);
  47         a2091_scsiregs *regs = (a2091_scsiregs *)(instance->base);
  48         unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
  49         unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  50
  51         /* don't allow DMA if the physical address is bad */
  52         if (addr & A2091_XFER_MASK) {
  53                 hdata->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
  54                 hdata->dma_bounce_buffer = kmalloc(hdata->dma_bounce_len,
  55                                                    GFP_KERNEL);
  56
  57                 /* can't allocate memory; use PIO */
  58                 if (!hdata->dma_bounce_buffer) {
  59                         hdata->dma_bounce_len = 0;
  60                         return 1;
  61                 }
  62
  63                 /* get the physical address of the bounce buffer */
  64                 addr = virt_to_bus(hdata->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->dma_bounce_buffer);
  70                         hdata->dma_bounce_buffer = NULL;
  71                         hdata->dma_bounce_len = 0;
  72                         return 1;
  73                 }
  74
  75                 if (!dir_in) {
  76                         /* copy to bounce buffer for a write */
  77                         memcpy(hdata->dma_bounce_buffer, cmd->SCp.ptr,
  78                                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->dma_dir = dir_in;
  88
  89         regs->CNTR = cntr;
  90
  91         /* setup DMA *physical* address */
  92         regs->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         regs->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         struct WD33C93_hostdata *hdata = shost_priv(instance);
 112         a2091_scsiregs *regs = (a2091_scsiregs *)(instance->base);
 113
 114         /* disable SCSI interrupts */
 115         unsigned short cntr = CNTR_PDMD;
 116
 117         if (!hdata->dma_dir)
 118                 cntr |= CNTR_DDIR;
 119
 120         /* disable SCSI interrupts */
 121         regs->CNTR = cntr;
 122
 123         /* flush if we were reading */
 124         if (hdata->dma_dir) {
 125                 regs->FLUSH = 1;
 126                 while (!(regs->ISTR & ISTR_FE_FLG))
 127                         ;
 128         }
 129
 130         /* clear a possible interrupt */
 131         regs->CINT = 1;
 132
 133         /* stop DMA */
 134         regs->SP_DMA = 1;
 135
 136         /* restore the CONTROL bits (minus the direction flag) */
 137         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
 138
 139         /* copy from a bounce buffer, if necessary */
 140         if (status && hdata->dma_bounce_buffer) {
 141                 if (hdata->dma_dir)
 142                         memcpy(SCpnt->SCp.ptr, hdata->dma_bounce_buffer,
 143                                SCpnt->SCp.this_residual);
 144                 kfree(hdata->dma_bounce_buffer);
 145                 hdata->dma_bounce_buffer = NULL;
 146                 hdata->dma_bounce_len = 0;
 147         }
 148 }
 149
 150 static int __init a2091_detect(struct scsi_host_template *tpnt)
 151 {
 152         static unsigned char called = 0;
 153         struct Scsi_Host *instance;
 154         unsigned long address;
 155         struct zorro_dev *z = NULL;
 156         wd33c93_regs wdregs;
 157         a2091_scsiregs *regs;
 158         struct WD33C93_hostdata *hdata;
 159         int num_a2091 = 0;
 160
 161         if (!MACH_IS_AMIGA || called)
 162                 return 0;
 163         called = 1;
 164
 165         tpnt->proc_name = "A2091";
 166         tpnt->proc_info = &wd33c93_proc_info;
 167
 168         while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 169                 if (z->id != ZORRO_PROD_CBM_A590_A2091_1 &&
 170                     z->id != ZORRO_PROD_CBM_A590_A2091_2)
 171                         continue;
 172                 address = z->resource.start;
 173                 if (!request_mem_region(address, 256, "wd33c93"))
 174                         continue;
 175
 176                 instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
 177                 if (instance == NULL)
 178                         goto release;
 179                 instance->base = ZTWO_VADDR(address);
 180                 instance->irq = IRQ_AMIGA_PORTS;
 181                 instance->unique_id = z->slotaddr;
 182                 regs = (a2091_scsiregs *)(instance->base);
 183                 regs->DAWR = DAWR_A2091;
 184                 wdregs.SASR = &regs->SASR;
 185                 wdregs.SCMD = &regs->SCMD;
 186                 hdata = shost_priv(instance);
 187                 hdata->no_sync = 0xff;
 188                 hdata->fast = 0;
 189                 hdata->dma_mode = CTRL_DMA;
 190                 wd33c93_init(instance, wdregs, dma_setup, dma_stop,
 191                              WD33C93_FS_8_10);
 192                 if (request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
 193                                 "A2091 SCSI", instance))
 194                         goto unregister;
 195                 regs->CNTR = CNTR_PDMD | CNTR_INTEN;
 196                 num_a2091++;
 197                 continue;
 198
 199 unregister:
 200                 scsi_unregister(instance);
 201 release:
 202                 release_mem_region(address, 256);
 203         }
 204
 205         return num_a2091;
 206 }
 207
 208 static int a2091_bus_reset(struct scsi_cmnd *cmd)
 209 {
 210         /* FIXME perform bus-specific reset */
 211
 212         /* FIXME 2: kill this function, and let midlayer fall back
 213            to the same action, calling wd33c93_host_reset() */
 214
 215         spin_lock_irq(cmd->device->host->host_lock);
 216         wd33c93_host_reset(cmd);
 217         spin_unlock_irq(cmd->device->host->host_lock);
 218
 219         return SUCCESS;
 220 }
 221
 222 #define HOSTS_C
 223
 224 static struct scsi_host_template driver_template = {
 225         .proc_name              = "A2901",
 226         .name                   = "Commodore A2091/A590 SCSI",
 227         .detect                 = a2091_detect,
 228         .release                = a2091_release,
 229         .queuecommand           = wd33c93_queuecommand,
 230         .eh_abort_handler       = wd33c93_abort,
 231         .eh_bus_reset_handler   = a2091_bus_reset,
 232         .eh_host_reset_handler  = wd33c93_host_reset,
 233         .can_queue              = CAN_QUEUE,
 234         .this_id                = 7,
 235         .sg_tablesize           = SG_ALL,
 236         .cmd_per_lun            = CMD_PER_LUN,
 237         .use_clustering         = DISABLE_CLUSTERING
 238 };
 239
 240
 241 #include "scsi_module.c"
 242
 243 static int a2091_release(struct Scsi_Host *instance)
 244 {
 245 #ifdef MODULE
 246         a2091_scsiregs *regs = (a2091_scsiregs *)(instance->base);
 247
 248         regs->CNTR = 0;
 249         release_mem_region(ZTWO_PADDR(instance->base), 256);
 250         free_irq(IRQ_AMIGA_PORTS, instance);
 251 #endif
 252         return 1;
 253 }
 254
 255 MODULE_LICENSE("GPL");