drivers/scsi/a3000.c

   1 #include <linux/types.h>
   2 #include <linux/mm.h>
   3 #include <linux/ioport.h>
   4 #include <linux/init.h>
   5 #include <linux/slab.h>
   6 #include <linux/spinlock.h>
   7 #include <linux/interrupt.h>
   8 #include <linux/platform_device.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 "a3000.h"
  18
  19
  20 struct a3000_hostdata {
  21         struct WD33C93_hostdata wh;
  22         struct a3000_scsiregs *regs;
  23 };
  24
  25 static irqreturn_t a3000_intr(int irq, void *data)
  26 {
  27         struct Scsi_Host *instance = data;
  28         struct a3000_hostdata *hdata = shost_priv(instance);
  29         unsigned int status = hdata->regs->ISTR;
  30         unsigned long flags;
  31
  32         if (!(status & ISTR_INT_P))
  33                 return IRQ_NONE;
  34         if (status & ISTR_INTS) {
  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         pr_warning("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
  41         return IRQ_NONE;
  42 }
  43
  44 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
  45 {
  46         struct Scsi_Host *instance = cmd->device->host;
  47         struct a3000_hostdata *hdata = shost_priv(instance);
  48         struct WD33C93_hostdata *wh = &hdata->wh;
  49         struct a3000_scsiregs *regs = hdata->regs;
  50         unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
  51         unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  52
  53         /*
  54          * if the physical address has the wrong alignment, or if
  55          * physical address is bad, or if it is a write and at the
  56          * end of a physical memory chunk, then allocate a bounce
  57          * buffer
  58          */
  59         if (addr & A3000_XFER_MASK) {
  60                 wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
  61                 wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
  62                                                 GFP_KERNEL);
  63
  64                 /* can't allocate memory; use PIO */
  65                 if (!wh->dma_bounce_buffer) {
  66                         wh->dma_bounce_len = 0;
  67                         return 1;
  68                 }
  69
  70                 if (!dir_in) {
  71                         /* copy to bounce buffer for a write */
  72                         memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
  73                                cmd->SCp.this_residual);
  74                 }
  75
  76                 addr = virt_to_bus(wh->dma_bounce_buffer);
  77         }
  78
  79         /* setup dma direction */
  80         if (!dir_in)
  81                 cntr |= CNTR_DDIR;
  82
  83         /* remember direction */
  84         wh->dma_dir = dir_in;
  85
  86         regs->CNTR = cntr;
  87
  88         /* setup DMA *physical* address */
  89         regs->ACR = addr;
  90
  91         if (dir_in) {
  92                 /* invalidate any cache */
  93                 cache_clear(addr, cmd->SCp.this_residual);
  94         } else {
  95                 /* push any dirty cache */
  96                 cache_push(addr, cmd->SCp.this_residual);
  97         }
  98
  99         /* start DMA */
 100         mb();                   /* make sure setup is completed */
 101         regs->ST_DMA = 1;
 102         mb();                   /* make sure DMA has started before next IO */
 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 a3000_hostdata *hdata = shost_priv(instance);
 112         struct WD33C93_hostdata *wh = &hdata->wh;
 113         struct a3000_scsiregs *regs = hdata->regs;
 114
 115         /* disable SCSI interrupts */
 116         unsigned short cntr = CNTR_PDMD;
 117
 118         if (!wh->dma_dir)
 119                 cntr |= CNTR_DDIR;
 120
 121         regs->CNTR = cntr;
 122         mb();                   /* make sure CNTR is updated before next IO */
 123
 124         /* flush if we were reading */
 125         if (wh->dma_dir) {
 126                 regs->FLUSH = 1;
 127                 mb();           /* don't allow prefetch */
 128                 while (!(regs->ISTR & ISTR_FE_FLG))
 129                         barrier();
 130                 mb();           /* no IO until FLUSH is done */
 131         }
 132
 133         /* clear a possible interrupt */
 134         /* I think that this CINT is only necessary if you are
 135          * using the terminal count features.   HM 7 Mar 1994
 136          */
 137         regs->CINT = 1;
 138
 139         /* stop DMA */
 140         regs->SP_DMA = 1;
 141         mb();                   /* make sure DMA is stopped before next IO */
 142
 143         /* restore the CONTROL bits (minus the direction flag) */
 144         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
 145         mb();                   /* make sure CNTR is updated before next IO */
 146
 147         /* copy from a bounce buffer, if necessary */
 148         if (status && wh->dma_bounce_buffer) {
 149                 if (SCpnt) {
 150                         if (wh->dma_dir && SCpnt)
 151                                 memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
 152                                        SCpnt->SCp.this_residual);
 153                         kfree(wh->dma_bounce_buffer);
 154                         wh->dma_bounce_buffer = NULL;
 155                         wh->dma_bounce_len = 0;
 156                 } else {
 157                         kfree(wh->dma_bounce_buffer);
 158                         wh->dma_bounce_buffer = NULL;
 159                         wh->dma_bounce_len = 0;
 160                 }
 161         }
 162 }
 163
 164 static int a3000_bus_reset(struct scsi_cmnd *cmd)
 165 {
 166         struct Scsi_Host *instance = cmd->device->host;
 167
 168         /* FIXME perform bus-specific reset */
 169
 170         /* FIXME 2: kill this entire function, which should
 171            cause mid-layer to call wd33c93_host_reset anyway? */
 172
 173         spin_lock_irq(instance->host_lock);
 174         wd33c93_host_reset(cmd);
 175         spin_unlock_irq(instance->host_lock);
 176
 177         return SUCCESS;
 178 }
 179
 180 static struct scsi_host_template amiga_a3000_scsi_template = {
 181         .module                 = THIS_MODULE,
 182         .name                   = "Amiga 3000 built-in SCSI",
 183         .proc_info              = wd33c93_proc_info,
 184         .proc_name              = "A3000",
 185         .queuecommand           = wd33c93_queuecommand,
 186         .eh_abort_handler       = wd33c93_abort,
 187         .eh_bus_reset_handler   = a3000_bus_reset,
 188         .eh_host_reset_handler  = wd33c93_host_reset,
 189         .can_queue              = CAN_QUEUE,
 190         .this_id                = 7,
 191         .sg_tablesize           = SG_ALL,
 192         .cmd_per_lun            = CMD_PER_LUN,
 193         .use_clustering         = ENABLE_CLUSTERING
 194 };
 195
 196 static int __init amiga_a3000_scsi_probe(struct platform_device *pdev)
 197 {
 198         struct resource *res;
 199         struct Scsi_Host *instance;
 200         int error;
 201         struct a3000_scsiregs *regs;
 202         wd33c93_regs wdregs;
 203         struct a3000_hostdata *hdata;
 204
 205         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 206         if (!res)
 207                 return -ENODEV;
 208
 209         if (!request_mem_region(res->start, resource_size(res), "wd33c93"))
 210                 return -EBUSY;
 211
 212         instance = scsi_host_alloc(&amiga_a3000_scsi_template,
 213                                    sizeof(struct a3000_hostdata));
 214         if (!instance) {
 215                 error = -ENOMEM;
 216                 goto fail_alloc;
 217         }
 218
 219         instance->irq = IRQ_AMIGA_PORTS;
 220
 221         regs = (struct a3000_scsiregs *)ZTWO_VADDR(res->start);
 222         regs->DAWR = DAWR_A3000;
 223
 224         wdregs.SASR = &regs->SASR;
 225         wdregs.SCMD = &regs->SCMD;
 226
 227         hdata = shost_priv(instance);
 228         hdata->wh.no_sync = 0xff;
 229         hdata->wh.fast = 0;
 230         hdata->wh.dma_mode = CTRL_DMA;
 231         hdata->regs = regs;
 232
 233         wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_12_15);
 234         error = request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED,
 235                             "A3000 SCSI", instance);
 236         if (error)
 237                 goto fail_irq;
 238
 239         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
 240
 241         error = scsi_add_host(instance, NULL);
 242         if (error)
 243                 goto fail_host;
 244
 245         platform_set_drvdata(pdev, instance);
 246
 247         scsi_scan_host(instance);
 248         return 0;
 249
 250 fail_host:
 251         free_irq(IRQ_AMIGA_PORTS, instance);
 252 fail_irq:
 253         scsi_host_put(instance);
 254 fail_alloc:
 255         release_mem_region(res->start, resource_size(res));
 256         return error;
 257 }
 258
 259 static int __exit amiga_a3000_scsi_remove(struct platform_device *pdev)
 260 {
 261         struct Scsi_Host *instance = platform_get_drvdata(pdev);
 262         struct a3000_hostdata *hdata = shost_priv(instance);
 263         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 264
 265         hdata->regs->CNTR = 0;
 266         scsi_remove_host(instance);
 267         free_irq(IRQ_AMIGA_PORTS, instance);
 268         scsi_host_put(instance);
 269         release_mem_region(res->start, resource_size(res));
 270         return 0;
 271 }
 272
 273 static struct platform_driver amiga_a3000_scsi_driver = {
 274         .remove = __exit_p(amiga_a3000_scsi_remove),
 275         .driver   = {
 276                 .name   = "amiga-a3000-scsi",
 277                 .owner  = THIS_MODULE,
 278         },
 279 };
 280
 281 static int __init amiga_a3000_scsi_init(void)
 282 {
 283         return platform_driver_probe(&amiga_a3000_scsi_driver,
 284                                      amiga_a3000_scsi_probe);
 285 }
 286 module_init(amiga_a3000_scsi_init);
 287
 288 static void __exit amiga_a3000_scsi_exit(void)
 289 {
 290         platform_driver_unregister(&amiga_a3000_scsi_driver);
 291 }
 292 module_exit(amiga_a3000_scsi_exit);
 293
 294 MODULE_DESCRIPTION("Amiga 3000 built-in SCSI");
 295 MODULE_LICENSE("GPL");
 296 MODULE_ALIAS("platform:amiga-a3000-scsi");