drivers/scsi/a2091.c

   1 #include <linux/types.h>
   2 #include <linux/init.h>
   3 #include <linux/interrupt.h>
   4 #include <linux/mm.h>
   5 #include <linux/slab.h>
   6 #include <linux/spinlock.h>
   7 #include <linux/zorro.h>
   8
   9 #include <asm/page.h>
  10 #include <asm/pgtable.h>
  11 #include <asm/amigaints.h>
  12 #include <asm/amigahw.h>
  13
  14 #include "scsi.h"
  15 #include "wd33c93.h"
  16 #include "a2091.h"
  17
  18
  19 struct a2091_hostdata {
  20         struct WD33C93_hostdata wh;
  21         struct a2091_scsiregs *regs;
  22 };
  23
  24 static irqreturn_t a2091_intr(int irq, void *data)
  25 {
  26         struct Scsi_Host *instance = data;
  27         struct a2091_hostdata *hdata = shost_priv(instance);
  28         unsigned int status = hdata->regs->ISTR;
  29         unsigned long flags;
  30
  31         if (!(status & (ISTR_INT_F | ISTR_INT_P)) || !(status & ISTR_INTS))
  32                 return IRQ_NONE;
  33
  34         spin_lock_irqsave(instance->host_lock, flags);
  35         wd33c93_intr(instance);
  36         spin_unlock_irqrestore(instance->host_lock, flags);
  37         return IRQ_HANDLED;
  38 }
  39
  40 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
  41 {
  42         struct Scsi_Host *instance = cmd->device->host;
  43         struct a2091_hostdata *hdata = shost_priv(instance);
  44         struct WD33C93_hostdata *wh = &hdata->wh;
  45         struct a2091_scsiregs *regs = hdata->regs;
  46         unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
  47         unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  48
  49         /* don't allow DMA if the physical address is bad */
  50         if (addr & A2091_XFER_MASK) {
  51                 wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
  52                 wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
  53                                                 GFP_KERNEL);
  54
  55                 /* can't allocate memory; use PIO */
  56                 if (!wh->dma_bounce_buffer) {
  57                         wh->dma_bounce_len = 0;
  58                         return 1;
  59                 }
  60
  61                 /* get the physical address of the bounce buffer */
  62                 addr = virt_to_bus(wh->dma_bounce_buffer);
  63
  64                 /* the bounce buffer may not be in the first 16M of physmem */
  65                 if (addr & A2091_XFER_MASK) {
  66                         /* we could use chipmem... maybe later */
  67                         kfree(wh->dma_bounce_buffer);
  68                         wh->dma_bounce_buffer = NULL;
  69                         wh->dma_bounce_len = 0;
  70                         return 1;
  71                 }
  72
  73                 if (!dir_in) {
  74                         /* copy to bounce buffer for a write */
  75                         memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
  76                                cmd->SCp.this_residual);
  77                 }
  78         }
  79
  80         /* setup dma direction */
  81         if (!dir_in)
  82                 cntr |= CNTR_DDIR;
  83
  84         /* remember direction */
  85         wh->dma_dir = dir_in;
  86
  87         regs->CNTR = cntr;
  88
  89         /* setup DMA *physical* address */
  90         regs->ACR = addr;
  91
  92         if (dir_in) {
  93                 /* invalidate any cache */
  94                 cache_clear(addr, cmd->SCp.this_residual);
  95         } else {
  96                 /* push any dirty cache */
  97                 cache_push(addr, cmd->SCp.this_residual);
  98         }
  99         /* start DMA */
 100         regs->ST_DMA = 1;
 101
 102         /* return success */
 103         return 0;
 104 }
 105
 106 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 107                      int status)
 108 {
 109         struct a2091_hostdata *hdata = shost_priv(instance);
 110         struct WD33C93_hostdata *wh = &hdata->wh;
 111         struct a2091_scsiregs *regs = hdata->regs;
 112
 113         /* disable SCSI interrupts */
 114         unsigned short cntr = CNTR_PDMD;
 115
 116         if (!wh->dma_dir)
 117                 cntr |= CNTR_DDIR;
 118
 119         /* disable SCSI interrupts */
 120         regs->CNTR = cntr;
 121
 122         /* flush if we were reading */
 123         if (wh->dma_dir) {
 124                 regs->FLUSH = 1;
 125                 while (!(regs->ISTR & ISTR_FE_FLG))
 126                         ;
 127         }
 128
 129         /* clear a possible interrupt */
 130         regs->CINT = 1;
 131
 132         /* stop DMA */
 133         regs->SP_DMA = 1;
 134
 135         /* restore the CONTROL bits (minus the direction flag) */
 136         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
 137
 138         /* copy from a bounce buffer, if necessary */
 139         if (status && wh->dma_bounce_buffer) {
 140                 if (wh->dma_dir)
 141                         memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
 142                                SCpnt->SCp.this_residual);
 143                 kfree(wh->dma_bounce_buffer);
 144                 wh->dma_bounce_buffer = NULL;
 145                 wh->dma_bounce_len = 0;
 146         }
 147 }
 148
 149 static int a2091_bus_reset(struct scsi_cmnd *cmd)
 150 {
 151         struct Scsi_Host *instance = cmd->device->host;
 152
 153         /* FIXME perform bus-specific reset */
 154
 155         /* FIXME 2: kill this function, and let midlayer fall back
 156            to the same action, calling wd33c93_host_reset() */
 157
 158         spin_lock_irq(instance->host_lock);
 159         wd33c93_host_reset(cmd);
 160         spin_unlock_irq(instance->host_lock);
 161
 162         return SUCCESS;
 163 }
 164
 165 static struct scsi_host_template a2091_scsi_template = {
 166         .module                 = THIS_MODULE,
 167         .name                   = "Commodore A2091/A590 SCSI",
 168         .proc_info              = wd33c93_proc_info,
 169         .proc_name              = "A2901",
 170         .queuecommand           = wd33c93_queuecommand,
 171         .eh_abort_handler       = wd33c93_abort,
 172         .eh_bus_reset_handler   = a2091_bus_reset,
 173         .eh_host_reset_handler  = wd33c93_host_reset,
 174         .can_queue              = CAN_QUEUE,
 175         .this_id                = 7,
 176         .sg_tablesize           = SG_ALL,
 177         .cmd_per_lun            = CMD_PER_LUN,
 178         .use_clustering         = DISABLE_CLUSTERING
 179 };
 180
 181 static int __devinit a2091_probe(struct zorro_dev *z,
 182                                  const struct zorro_device_id *ent)
 183 {
 184         struct Scsi_Host *instance;
 185         int error;
 186         struct a2091_scsiregs *regs;
 187         wd33c93_regs wdregs;
 188         struct a2091_hostdata *hdata;
 189
 190         if (!request_mem_region(z->resource.start, 256, "wd33c93"))
 191                 return -EBUSY;
 192
 193         instance = scsi_host_alloc(&a2091_scsi_template,
 194                                    sizeof(struct a2091_hostdata));
 195         if (!instance) {
 196                 error = -ENOMEM;
 197                 goto fail_alloc;
 198         }
 199
 200         instance->irq = IRQ_AMIGA_PORTS;
 201         instance->unique_id = z->slotaddr;
 202
 203         regs = (struct a2091_scsiregs *)ZTWO_VADDR(z->resource.start);
 204         regs->DAWR = DAWR_A2091;
 205
 206         wdregs.SASR = &regs->SASR;
 207         wdregs.SCMD = &regs->SCMD;
 208
 209         hdata = shost_priv(instance);
 210         hdata->wh.no_sync = 0xff;
 211         hdata->wh.fast = 0;
 212         hdata->wh.dma_mode = CTRL_DMA;
 213         hdata->regs = regs;
 214
 215         wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_8_10);
 216         error = request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
 217                             "A2091 SCSI", instance);
 218         if (error)
 219                 goto fail_irq;
 220
 221         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
 222
 223         error = scsi_add_host(instance, NULL);
 224         if (error)
 225                 goto fail_host;
 226
 227         zorro_set_drvdata(z, instance);
 228
 229         scsi_scan_host(instance);
 230         return 0;
 231
 232 fail_host:
 233         free_irq(IRQ_AMIGA_PORTS, instance);
 234 fail_irq:
 235         scsi_host_put(instance);
 236 fail_alloc:
 237         release_mem_region(z->resource.start, 256);
 238         return error;
 239 }
 240
 241 static void __devexit a2091_remove(struct zorro_dev *z)
 242 {
 243         struct Scsi_Host *instance = zorro_get_drvdata(z);
 244         struct a2091_hostdata *hdata = shost_priv(instance);
 245
 246         hdata->regs->CNTR = 0;
 247         scsi_remove_host(instance);
 248         free_irq(IRQ_AMIGA_PORTS, instance);
 249         scsi_host_put(instance);
 250         release_mem_region(z->resource.start, 256);
 251 }
 252
 253 static struct zorro_device_id a2091_zorro_tbl[] __devinitdata = {
 254         { ZORRO_PROD_CBM_A590_A2091_1 },
 255         { ZORRO_PROD_CBM_A590_A2091_2 },
 256         { 0 }
 257 };
 258 MODULE_DEVICE_TABLE(zorro, a2091_zorro_tbl);
 259
 260 static struct zorro_driver a2091_driver = {
 261         .name           = "a2091",
 262         .id_table       = a2091_zorro_tbl,
 263         .probe          = a2091_probe,
 264         .remove         = __devexit_p(a2091_remove),
 265 };
 266
 267 static int __init a2091_init(void)
 268 {
 269         return zorro_register_driver(&a2091_driver);
 270 }
 271 module_init(a2091_init);
 272
 273 static void __exit a2091_exit(void)
 274 {
 275         zorro_unregister_driver(&a2091_driver);
 276 }
 277 module_exit(a2091_exit);
 278
 279 MODULE_DESCRIPTION("Commodore A2091/A590 SCSI");
 280 MODULE_LICENSE("GPL");