linux/drivers/scsi/a2091.c
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   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#include <linux/module.h>
   9
  10#include <asm/page.h>
  11#include <asm/pgtable.h>
  12#include <asm/amigaints.h>
  13#include <asm/amigahw.h>
  14
  15#include "scsi.h"
  16#include "wd33c93.h"
  17#include "a2091.h"
  18
  19
  20struct a2091_hostdata {
  21        struct WD33C93_hostdata wh;
  22        struct a2091_scsiregs *regs;
  23};
  24
  25static irqreturn_t a2091_intr(int irq, void *data)
  26{
  27        struct Scsi_Host *instance = data;
  28        struct a2091_hostdata *hdata = shost_priv(instance);
  29        unsigned int status = hdata->regs->ISTR;
  30        unsigned long flags;
  31
  32        if (!(status & (ISTR_INT_F | ISTR_INT_P)) || !(status & ISTR_INTS))
  33                return IRQ_NONE;
  34
  35        spin_lock_irqsave(instance->host_lock, flags);
  36        wd33c93_intr(instance);
  37        spin_unlock_irqrestore(instance->host_lock, flags);
  38        return IRQ_HANDLED;
  39}
  40
  41static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
  42{
  43        struct Scsi_Host *instance = cmd->device->host;
  44        struct a2091_hostdata *hdata = shost_priv(instance);
  45        struct WD33C93_hostdata *wh = &hdata->wh;
  46        struct a2091_scsiregs *regs = hdata->regs;
  47        unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
  48        unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  49
  50        /* don't allow DMA if the physical address is bad */
  51        if (addr & A2091_XFER_MASK) {
  52                wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
  53                wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
  54                                                GFP_KERNEL);
  55
  56                /* can't allocate memory; use PIO */
  57                if (!wh->dma_bounce_buffer) {
  58                        wh->dma_bounce_len = 0;
  59                        return 1;
  60                }
  61
  62                /* get the physical address of the bounce buffer */
  63                addr = virt_to_bus(wh->dma_bounce_buffer);
  64
  65                /* the bounce buffer may not be in the first 16M of physmem */
  66                if (addr & A2091_XFER_MASK) {
  67                        /* we could use chipmem... maybe later */
  68                        kfree(wh->dma_bounce_buffer);
  69                        wh->dma_bounce_buffer = NULL;
  70                        wh->dma_bounce_len = 0;
  71                        return 1;
  72                }
  73
  74                if (!dir_in) {
  75                        /* copy to bounce buffer for a write */
  76                        memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
  77                               cmd->SCp.this_residual);
  78                }
  79        }
  80
  81        /* setup dma direction */
  82        if (!dir_in)
  83                cntr |= CNTR_DDIR;
  84
  85        /* remember direction */
  86        wh->dma_dir = dir_in;
  87
  88        regs->CNTR = cntr;
  89
  90        /* setup DMA *physical* address */
  91        regs->ACR = addr;
  92
  93        if (dir_in) {
  94                /* invalidate any cache */
  95                cache_clear(addr, cmd->SCp.this_residual);
  96        } else {
  97                /* push any dirty cache */
  98                cache_push(addr, cmd->SCp.this_residual);
  99        }
 100        /* start DMA */
 101        regs->ST_DMA = 1;
 102
 103        /* return success */
 104        return 0;
 105}
 106
 107static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 108                     int status)
 109{
 110        struct a2091_hostdata *hdata = shost_priv(instance);
 111        struct WD33C93_hostdata *wh = &hdata->wh;
 112        struct a2091_scsiregs *regs = hdata->regs;
 113
 114        /* disable SCSI interrupts */
 115        unsigned short cntr = CNTR_PDMD;
 116
 117        if (!wh->dma_dir)
 118                cntr |= CNTR_DDIR;
 119
 120        /* disable SCSI interrupts */
 121        regs->CNTR = cntr;
 122
 123        /* flush if we were reading */
 124        if (wh->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 && wh->dma_bounce_buffer) {
 141                if (wh->dma_dir)
 142                        memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
 143                               SCpnt->SCp.this_residual);
 144                kfree(wh->dma_bounce_buffer);
 145                wh->dma_bounce_buffer = NULL;
 146                wh->dma_bounce_len = 0;
 147        }
 148}
 149
 150static int a2091_bus_reset(struct scsi_cmnd *cmd)
 151{
 152        struct Scsi_Host *instance = cmd->device->host;
 153
 154        /* FIXME perform bus-specific reset */
 155
 156        /* FIXME 2: kill this function, and let midlayer fall back
 157           to the same action, calling wd33c93_host_reset() */
 158
 159        spin_lock_irq(instance->host_lock);
 160        wd33c93_host_reset(cmd);
 161        spin_unlock_irq(instance->host_lock);
 162
 163        return SUCCESS;
 164}
 165
 166static struct scsi_host_template a2091_scsi_template = {
 167        .module                 = THIS_MODULE,
 168        .name                   = "Commodore A2091/A590 SCSI",
 169        .proc_info              = wd33c93_proc_info,
 170        .proc_name              = "A2901",
 171        .queuecommand           = wd33c93_queuecommand,
 172        .eh_abort_handler       = wd33c93_abort,
 173        .eh_bus_reset_handler   = a2091_bus_reset,
 174        .eh_host_reset_handler  = wd33c93_host_reset,
 175        .can_queue              = CAN_QUEUE,
 176        .this_id                = 7,
 177        .sg_tablesize           = SG_ALL,
 178        .cmd_per_lun            = CMD_PER_LUN,
 179        .use_clustering         = DISABLE_CLUSTERING
 180};
 181
 182static int __devinit a2091_probe(struct zorro_dev *z,
 183                                 const struct zorro_device_id *ent)
 184{
 185        struct Scsi_Host *instance;
 186        int error;
 187        struct a2091_scsiregs *regs;
 188        wd33c93_regs wdregs;
 189        struct a2091_hostdata *hdata;
 190
 191        if (!request_mem_region(z->resource.start, 256, "wd33c93"))
 192                return -EBUSY;
 193
 194        instance = scsi_host_alloc(&a2091_scsi_template,
 195                                   sizeof(struct a2091_hostdata));
 196        if (!instance) {
 197                error = -ENOMEM;
 198                goto fail_alloc;
 199        }
 200
 201        instance->irq = IRQ_AMIGA_PORTS;
 202        instance->unique_id = z->slotaddr;
 203
 204        regs = (struct a2091_scsiregs *)ZTWO_VADDR(z->resource.start);
 205        regs->DAWR = DAWR_A2091;
 206
 207        wdregs.SASR = &regs->SASR;
 208        wdregs.SCMD = &regs->SCMD;
 209
 210        hdata = shost_priv(instance);
 211        hdata->wh.no_sync = 0xff;
 212        hdata->wh.fast = 0;
 213        hdata->wh.dma_mode = CTRL_DMA;
 214        hdata->regs = regs;
 215
 216        wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_8_10);
 217        error = request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
 218                            "A2091 SCSI", instance);
 219        if (error)
 220                goto fail_irq;
 221
 222        regs->CNTR = CNTR_PDMD | CNTR_INTEN;
 223
 224        error = scsi_add_host(instance, NULL);
 225        if (error)
 226                goto fail_host;
 227
 228        zorro_set_drvdata(z, instance);
 229
 230        scsi_scan_host(instance);
 231        return 0;
 232
 233fail_host:
 234        free_irq(IRQ_AMIGA_PORTS, instance);
 235fail_irq:
 236        scsi_host_put(instance);
 237fail_alloc:
 238        release_mem_region(z->resource.start, 256);
 239        return error;
 240}
 241
 242static void __devexit a2091_remove(struct zorro_dev *z)
 243{
 244        struct Scsi_Host *instance = zorro_get_drvdata(z);
 245        struct a2091_hostdata *hdata = shost_priv(instance);
 246
 247        hdata->regs->CNTR = 0;
 248        scsi_remove_host(instance);
 249        free_irq(IRQ_AMIGA_PORTS, instance);
 250        scsi_host_put(instance);
 251        release_mem_region(z->resource.start, 256);
 252}
 253
 254static struct zorro_device_id a2091_zorro_tbl[] __devinitdata = {
 255        { ZORRO_PROD_CBM_A590_A2091_1 },
 256        { ZORRO_PROD_CBM_A590_A2091_2 },
 257        { 0 }
 258};
 259MODULE_DEVICE_TABLE(zorro, a2091_zorro_tbl);
 260
 261static struct zorro_driver a2091_driver = {
 262        .name           = "a2091",
 263        .id_table       = a2091_zorro_tbl,
 264        .probe          = a2091_probe,
 265        .remove         = __devexit_p(a2091_remove),
 266};
 267
 268static int __init a2091_init(void)
 269{
 270        return zorro_register_driver(&a2091_driver);
 271}
 272module_init(a2091_init);
 273
 274static void __exit a2091_exit(void)
 275{
 276        zorro_unregister_driver(&a2091_driver);
 277}
 278module_exit(a2091_exit);
 279
 280MODULE_DESCRIPTION("Commodore A2091/A590 SCSI");
 281MODULE_LICENSE("GPL");
 282
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