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 #define DMA(ptr)        ((a2091_scsiregs *)((ptr)->base))
  26
  27 static int a2091_release(struct Scsi_Host *instance);
  28
  29 static irqreturn_t a2091_intr(int irq, void *_instance)
  30 {
  31         unsigned long flags;
  32         unsigned int status;
  33         struct Scsi_Host *instance = (struct Scsi_Host *)_instance;
  34
  35         status = DMA(instance)->ISTR;
  36         if (!(status & (ISTR_INT_F | ISTR_INT_P)) || !(status & ISTR_INTS))
  37                 return IRQ_NONE;
  38
  39         spin_lock_irqsave(instance->host_lock, flags);
  40         wd33c93_intr(instance);
  41         spin_unlock_irqrestore(instance->host_lock, flags);
  42         return IRQ_HANDLED;
  43 }
  44
  45 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
  46 {
  47         struct Scsi_Host *instance = cmd->device->host;
  48         struct WD33C93_hostdata *hdata = shost_priv(instance);
  49         unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
  50         unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  51
  52         /* don't allow DMA if the physical address is bad */
  53         if (addr & A2091_XFER_MASK) {
  54                 hdata->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
  55                 hdata->dma_bounce_buffer = kmalloc(hdata->dma_bounce_len,
  56                                                    GFP_KERNEL);
  57
  58                 /* can't allocate memory; use PIO */
  59                 if (!hdata->dma_bounce_buffer) {
  60                         hdata->dma_bounce_len = 0;
  61                         return 1;
  62                 }
  63
  64                 /* get the physical address of the bounce buffer */
  65                 addr = virt_to_bus(hdata->dma_bounce_buffer);
  66
  67                 /* the bounce buffer may not be in the first 16M of physmem */
  68                 if (addr & A2091_XFER_MASK) {
  69                         /* we could use chipmem... maybe later */
  70                         kfree(hdata->dma_bounce_buffer);
  71                         hdata->dma_bounce_buffer = NULL;
  72                         hdata->dma_bounce_len = 0;
  73                         return 1;
  74                 }
  75
  76                 if (!dir_in) {
  77                         /* copy to bounce buffer for a write */
  78                         memcpy(hdata->dma_bounce_buffer, cmd->SCp.ptr,
  79                                cmd->SCp.this_residual);
  80                 }
  81         }
  82
  83         /* setup dma direction */
  84         if (!dir_in)
  85                 cntr |= CNTR_DDIR;
  86
  87         /* remember direction */
  88         hdata->dma_dir = dir_in;
  89
  90         DMA(cmd->device->host)->CNTR = cntr;
  91
  92         /* setup DMA *physical* address */
  93         DMA(cmd->device->host)->ACR = addr;
  94
  95         if (dir_in) {
  96                 /* invalidate any cache */
  97                 cache_clear(addr, cmd->SCp.this_residual);
  98         } else {
  99                 /* push any dirty cache */
 100                 cache_push(addr, cmd->SCp.this_residual);
 101         }
 102         /* start DMA */
 103         DMA(cmd->device->host)->ST_DMA = 1;
 104
 105         /* return success */
 106         return 0;
 107 }
 108
 109 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 110                      int status)
 111 {
 112         struct WD33C93_hostdata *hdata = shost_priv(instance);
 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         DMA(instance)->CNTR = cntr;
 122
 123         /* flush if we were reading */
 124         if (hdata->dma_dir) {
 125                 DMA(instance)->FLUSH = 1;
 126                 while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
 127                         ;
 128         }
 129
 130         /* clear a possible interrupt */
 131         DMA(instance)->CINT = 1;
 132
 133         /* stop DMA */
 134         DMA(instance)->SP_DMA = 1;
 135
 136         /* restore the CONTROL bits (minus the direction flag) */
 137         DMA(instance)->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 regs;
 157         struct WD33C93_hostdata *hdata;
 158         int num_a2091 = 0;
 159
 160         if (!MACH_IS_AMIGA || called)
 161                 return 0;
 162         called = 1;
 163
 164         tpnt->proc_name = "A2091";
 165         tpnt->proc_info = &wd33c93_proc_info;
 166
 167         while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 168                 if (z->id != ZORRO_PROD_CBM_A590_A2091_1 &&
 169                     z->id != ZORRO_PROD_CBM_A590_A2091_2)
 170                         continue;
 171                 address = z->resource.start;
 172                 if (!request_mem_region(address, 256, "wd33c93"))
 173                         continue;
 174
 175                 instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
 176                 if (instance == NULL)
 177                         goto release;
 178                 instance->base = ZTWO_VADDR(address);
 179                 instance->irq = IRQ_AMIGA_PORTS;
 180                 instance->unique_id = z->slotaddr;
 181                 DMA(instance)->DAWR = DAWR_A2091;
 182                 regs.SASR = &(DMA(instance)->SASR);
 183                 regs.SCMD = &(DMA(instance)->SCMD);
 184                 hdata = shost_priv(instance);
 185                 hdata->no_sync = 0xff;
 186                 hdata->fast = 0;
 187                 hdata->dma_mode = CTRL_DMA;
 188                 wd33c93_init(instance, regs, dma_setup, dma_stop,
 189                              WD33C93_FS_8_10);
 190                 if (request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
 191                                 "A2091 SCSI", instance))
 192                         goto unregister;
 193                 DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
 194                 num_a2091++;
 195                 continue;
 196
 197 unregister:
 198                 scsi_unregister(instance);
 199 release:
 200                 release_mem_region(address, 256);
 201         }
 202
 203         return num_a2091;
 204 }
 205
 206 static int a2091_bus_reset(struct scsi_cmnd *cmd)
 207 {
 208         /* FIXME perform bus-specific reset */
 209
 210         /* FIXME 2: kill this function, and let midlayer fall back
 211            to the same action, calling wd33c93_host_reset() */
 212
 213         spin_lock_irq(cmd->device->host->host_lock);
 214         wd33c93_host_reset(cmd);
 215         spin_unlock_irq(cmd->device->host->host_lock);
 216
 217         return SUCCESS;
 218 }
 219
 220 #define HOSTS_C
 221
 222 static struct scsi_host_template driver_template = {
 223         .proc_name              = "A2901",
 224         .name                   = "Commodore A2091/A590 SCSI",
 225         .detect                 = a2091_detect,
 226         .release                = a2091_release,
 227         .queuecommand           = wd33c93_queuecommand,
 228         .eh_abort_handler       = wd33c93_abort,
 229         .eh_bus_reset_handler   = a2091_bus_reset,
 230         .eh_host_reset_handler  = wd33c93_host_reset,
 231         .can_queue              = CAN_QUEUE,
 232         .this_id                = 7,
 233         .sg_tablesize           = SG_ALL,
 234         .cmd_per_lun            = CMD_PER_LUN,
 235         .use_clustering         = DISABLE_CLUSTERING
 236 };
 237
 238
 239 #include "scsi_module.c"
 240
 241 static int a2091_release(struct Scsi_Host *instance)
 242 {
 243 #ifdef MODULE
 244         DMA(instance)->CNTR = 0;
 245         release_mem_region(ZTWO_PADDR(instance->base), 256);
 246         free_irq(IRQ_AMIGA_PORTS, instance);
 247 #endif
 248         return 1;
 249 }
 250
 251 MODULE_LICENSE("GPL");