drivers/scsi/gvp11.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 "gvp11.h"
  21
  22 #include <linux/stat.h>
  23
  24
  25 #define DMA(ptr)        ((gvp11_scsiregs *)((ptr)->base))
  26
  27 static irqreturn_t gvp11_intr(int irq, void *_instance)
  28 {
  29         unsigned long flags;
  30         unsigned int status;
  31         struct Scsi_Host *instance = (struct Scsi_Host *)_instance;
  32
  33         status = DMA(instance)->CNTR;
  34         if (!(status & GVP11_DMAC_INT_PENDING))
  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 gvp11_xfer_mask = 0;
  44
  45 void gvp11_setup(char *str, int *ints)
  46 {
  47         gvp11_xfer_mask = ints[1];
  48 }
  49
  50 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
  51 {
  52         struct Scsi_Host *instance = cmd->device->host;
  53         struct WD33C93_hostdata *hdata = shost_priv(instance);
  54         unsigned short cntr = GVP11_DMAC_INT_ENABLE;
  55         unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  56         int bank_mask;
  57         static int scsi_alloc_out_of_range = 0;
  58
  59         /* use bounce buffer if the physical address is bad */
  60         if (addr & hdata->dma_xfer_mask) {
  61                 hdata->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
  62
  63                 if (!scsi_alloc_out_of_range) {
  64                         hdata->dma_bounce_buffer =
  65                                 kmalloc(hdata->dma_bounce_len, GFP_KERNEL);
  66                         hdata->dma_buffer_pool = BUF_SCSI_ALLOCED;
  67                 }
  68
  69                 if (scsi_alloc_out_of_range ||
  70                     !hdata->dma_bounce_buffer) {
  71                         hdata->dma_bounce_buffer =
  72                                 amiga_chip_alloc(hdata->dma_bounce_len,
  73                                                  "GVP II SCSI Bounce Buffer");
  74
  75                         if (!hdata->dma_bounce_buffer) {
  76                                 hdata->dma_bounce_len = 0;
  77                                 return 1;
  78                         }
  79
  80                         hdata->dma_buffer_pool = BUF_CHIP_ALLOCED;
  81                 }
  82
  83                 /* check if the address of the bounce buffer is OK */
  84                 addr = virt_to_bus(hdata->dma_bounce_buffer);
  85
  86                 if (addr & hdata->dma_xfer_mask) {
  87                         /* fall back to Chip RAM if address out of range */
  88                         if (hdata->dma_buffer_pool == BUF_SCSI_ALLOCED) {
  89                                 kfree(hdata->dma_bounce_buffer);
  90                                 scsi_alloc_out_of_range = 1;
  91                         } else {
  92                                 amiga_chip_free(hdata->dma_bounce_buffer);
  93                         }
  94
  95                         hdata->dma_bounce_buffer =
  96                                 amiga_chip_alloc(hdata->dma_bounce_len,
  97                                                  "GVP II SCSI Bounce Buffer");
  98
  99                         if (!hdata->dma_bounce_buffer) {
 100                                 hdata->dma_bounce_len = 0;
 101                                 return 1;
 102                         }
 103
 104                         addr = virt_to_bus(hdata->dma_bounce_buffer);
 105                         hdata->dma_buffer_pool = BUF_CHIP_ALLOCED;
 106                 }
 107
 108                 if (!dir_in) {
 109                         /* copy to bounce buffer for a write */
 110                         memcpy(hdata->dma_bounce_buffer, cmd->SCp.ptr,
 111                                cmd->SCp.this_residual);
 112                 }
 113         }
 114
 115         /* setup dma direction */
 116         if (!dir_in)
 117                 cntr |= GVP11_DMAC_DIR_WRITE;
 118
 119         hdata->dma_dir = dir_in;
 120         DMA(cmd->device->host)->CNTR = cntr;
 121
 122         /* setup DMA *physical* address */
 123         DMA(cmd->device->host)->ACR = addr;
 124
 125         if (dir_in) {
 126                 /* invalidate any cache */
 127                 cache_clear(addr, cmd->SCp.this_residual);
 128         } else {
 129                 /* push any dirty cache */
 130                 cache_push(addr, cmd->SCp.this_residual);
 131         }
 132
 133         bank_mask = (~hdata->dma_xfer_mask >> 18) & 0x01c0;
 134         if (bank_mask)
 135                 DMA(cmd->device->host)->BANK = bank_mask & (addr >> 18);
 136
 137         /* start DMA */
 138         DMA(cmd->device->host)->ST_DMA = 1;
 139
 140         /* return success */
 141         return 0;
 142 }
 143
 144 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 145                      int status)
 146 {
 147         struct WD33C93_hostdata *hdata = shost_priv(instance);
 148
 149         /* stop DMA */
 150         DMA(instance)->SP_DMA = 1;
 151         /* remove write bit from CONTROL bits */
 152         DMA(instance)->CNTR = GVP11_DMAC_INT_ENABLE;
 153
 154         /* copy from a bounce buffer, if necessary */
 155         if (status && hdata->dma_bounce_buffer) {
 156                 if (hdata->dma_dir && SCpnt)
 157                         memcpy(SCpnt->SCp.ptr, hdata->dma_bounce_buffer,
 158                                SCpnt->SCp.this_residual);
 159
 160                 if (hdata->dma_buffer_pool == BUF_SCSI_ALLOCED)
 161                         kfree(hdata->dma_bounce_buffer);
 162                 else
 163                         amiga_chip_free(hdata->dma_bounce_buffer);
 164
 165                 hdata->dma_bounce_buffer = NULL;
 166                 hdata->dma_bounce_len = 0;
 167         }
 168 }
 169
 170 #define CHECK_WD33C93
 171
 172 int __init gvp11_detect(struct scsi_host_template *tpnt)
 173 {
 174         static unsigned char called = 0;
 175         struct Scsi_Host *instance;
 176         unsigned long address;
 177         unsigned int epc;
 178         struct zorro_dev *z = NULL;
 179         unsigned int default_dma_xfer_mask;
 180         struct WD33C93_hostdata *hdata;
 181         wd33c93_regs regs;
 182         int num_gvp11 = 0;
 183 #ifdef CHECK_WD33C93
 184         volatile unsigned char *sasr_3393, *scmd_3393;
 185         unsigned char save_sasr;
 186         unsigned char q, qq;
 187 #endif
 188
 189         if (!MACH_IS_AMIGA || called)
 190                 return 0;
 191         called = 1;
 192
 193         tpnt->proc_name = "GVP11";
 194         tpnt->proc_info = &wd33c93_proc_info;
 195
 196         while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 197                 /*
 198                  * This should (hopefully) be the correct way to identify
 199                  * all the different GVP SCSI controllers (except for the
 200                  * SERIES I though).
 201                  */
 202
 203                 if (z->id == ZORRO_PROD_GVP_COMBO_030_R3_SCSI ||
 204                     z->id == ZORRO_PROD_GVP_SERIES_II)
 205                         default_dma_xfer_mask = ~0x00ffffff;
 206                 else if (z->id == ZORRO_PROD_GVP_GFORCE_030_SCSI ||
 207                          z->id == ZORRO_PROD_GVP_A530_SCSI ||
 208                          z->id == ZORRO_PROD_GVP_COMBO_030_R4_SCSI)
 209                         default_dma_xfer_mask = ~0x01ffffff;
 210                 else if (z->id == ZORRO_PROD_GVP_A1291 ||
 211                          z->id == ZORRO_PROD_GVP_GFORCE_040_SCSI_1)
 212                         default_dma_xfer_mask = ~0x07ffffff;
 213                 else
 214                         continue;
 215
 216                 /*
 217                  * Rumors state that some GVP ram boards use the same product
 218                  * code as the SCSI controllers. Therefore if the board-size
 219                  * is not 64KB we asume it is a ram board and bail out.
 220                  */
 221                 if (z->resource.end - z->resource.start != 0xffff)
 222                         continue;
 223
 224                 address = z->resource.start;
 225                 if (!request_mem_region(address, 256, "wd33c93"))
 226                         continue;
 227
 228 #ifdef CHECK_WD33C93
 229
 230                 /*
 231                  * These darn GVP boards are a problem - it can be tough to tell
 232                  * whether or not they include a SCSI controller. This is the
 233                  * ultimate Yet-Another-GVP-Detection-Hack in that it actually
 234                  * probes for a WD33c93 chip: If we find one, it's extremely
 235                  * likely that this card supports SCSI, regardless of Product_
 236                  * Code, Board_Size, etc.
 237                  */
 238
 239                 /* Get pointers to the presumed register locations and save contents */
 240
 241                 sasr_3393 = &(((gvp11_scsiregs *)(ZTWO_VADDR(address)))->SASR);
 242                 scmd_3393 = &(((gvp11_scsiregs *)(ZTWO_VADDR(address)))->SCMD);
 243                 save_sasr = *sasr_3393;
 244
 245                 /* First test the AuxStatus Reg */
 246
 247                 q = *sasr_3393; /* read it */
 248                 if (q & 0x08)   /* bit 3 should always be clear */
 249                         goto release;
 250                 *sasr_3393 = WD_AUXILIARY_STATUS;       /* setup indirect address */
 251                 if (*sasr_3393 == WD_AUXILIARY_STATUS) {        /* shouldn't retain the write */
 252                         *sasr_3393 = save_sasr; /* Oops - restore this byte */
 253                         goto release;
 254                 }
 255                 if (*sasr_3393 != q) {  /* should still read the same */
 256                         *sasr_3393 = save_sasr; /* Oops - restore this byte */
 257                         goto release;
 258                 }
 259                 if (*scmd_3393 != q)    /* and so should the image at 0x1f */
 260                         goto release;
 261
 262                 /*
 263                  * Ok, we probably have a wd33c93, but let's check a few other places
 264                  * for good measure. Make sure that this works for both 'A and 'B
 265                  * chip versions.
 266                  */
 267
 268                 *sasr_3393 = WD_SCSI_STATUS;
 269                 q = *scmd_3393;
 270                 *sasr_3393 = WD_SCSI_STATUS;
 271                 *scmd_3393 = ~q;
 272                 *sasr_3393 = WD_SCSI_STATUS;
 273                 qq = *scmd_3393;
 274                 *sasr_3393 = WD_SCSI_STATUS;
 275                 *scmd_3393 = q;
 276                 if (qq != q)    /* should be read only */
 277                         goto release;
 278                 *sasr_3393 = 0x1e;      /* this register is unimplemented */
 279                 q = *scmd_3393;
 280                 *sasr_3393 = 0x1e;
 281                 *scmd_3393 = ~q;
 282                 *sasr_3393 = 0x1e;
 283                 qq = *scmd_3393;
 284                 *sasr_3393 = 0x1e;
 285                 *scmd_3393 = q;
 286                 if (qq != q || qq != 0xff)      /* should be read only, all 1's */
 287                         goto release;
 288                 *sasr_3393 = WD_TIMEOUT_PERIOD;
 289                 q = *scmd_3393;
 290                 *sasr_3393 = WD_TIMEOUT_PERIOD;
 291                 *scmd_3393 = ~q;
 292                 *sasr_3393 = WD_TIMEOUT_PERIOD;
 293                 qq = *scmd_3393;
 294                 *sasr_3393 = WD_TIMEOUT_PERIOD;
 295                 *scmd_3393 = q;
 296                 if (qq != (~q & 0xff))  /* should be read/write */
 297                         goto release;
 298 #endif
 299
 300                 instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
 301                 if (instance == NULL)
 302                         goto release;
 303                 instance->base = ZTWO_VADDR(address);
 304                 instance->irq = IRQ_AMIGA_PORTS;
 305                 instance->unique_id = z->slotaddr;
 306
 307                 hdata = shost_priv(instance);
 308                 if (gvp11_xfer_mask)
 309                         hdata->dma_xfer_mask = gvp11_xfer_mask;
 310                 else
 311                         hdata->dma_xfer_mask = default_dma_xfer_mask;
 312
 313                 DMA(instance)->secret2 = 1;
 314                 DMA(instance)->secret1 = 0;
 315                 DMA(instance)->secret3 = 15;
 316                 while (DMA(instance)->CNTR & GVP11_DMAC_BUSY)
 317                         ;
 318                 DMA(instance)->CNTR = 0;
 319
 320                 DMA(instance)->BANK = 0;
 321
 322                 epc = *(unsigned short *)(ZTWO_VADDR(address) + 0x8000);
 323
 324                 /*
 325                  * Check for 14MHz SCSI clock
 326                  */
 327                 regs.SASR = &(DMA(instance)->SASR);
 328                 regs.SCMD = &(DMA(instance)->SCMD);
 329                 hdata->no_sync = 0xff;
 330                 hdata->fast = 0;
 331                 hdata->dma_mode = CTRL_DMA;
 332                 wd33c93_init(instance, regs, dma_setup, dma_stop,
 333                              (epc & GVP_SCSICLKMASK) ? WD33C93_FS_8_10
 334                                                      : WD33C93_FS_12_15);
 335
 336                 if (request_irq(IRQ_AMIGA_PORTS, gvp11_intr, IRQF_SHARED,
 337                                 "GVP11 SCSI", instance))
 338                         goto unregister;
 339                 DMA(instance)->CNTR = GVP11_DMAC_INT_ENABLE;
 340                 num_gvp11++;
 341                 continue;
 342
 343 unregister:
 344                 scsi_unregister(instance);
 345 release:
 346                 release_mem_region(address, 256);
 347         }
 348
 349         return num_gvp11;
 350 }
 351
 352 static int gvp11_bus_reset(struct scsi_cmnd *cmd)
 353 {
 354         /* FIXME perform bus-specific reset */
 355
 356         /* FIXME 2: shouldn't we no-op this function (return
 357            FAILED), and fall back to host reset function,
 358            wd33c93_host_reset ? */
 359
 360         spin_lock_irq(cmd->device->host->host_lock);
 361         wd33c93_host_reset(cmd);
 362         spin_unlock_irq(cmd->device->host->host_lock);
 363
 364         return SUCCESS;
 365 }
 366
 367
 368 #define HOSTS_C
 369
 370 #include "gvp11.h"
 371
 372 static struct scsi_host_template driver_template = {
 373         .proc_name              = "GVP11",
 374         .name                   = "GVP Series II SCSI",
 375         .detect                 = gvp11_detect,
 376         .release                = gvp11_release,
 377         .queuecommand           = wd33c93_queuecommand,
 378         .eh_abort_handler       = wd33c93_abort,
 379         .eh_bus_reset_handler   = gvp11_bus_reset,
 380         .eh_host_reset_handler  = wd33c93_host_reset,
 381         .can_queue              = CAN_QUEUE,
 382         .this_id                = 7,
 383         .sg_tablesize           = SG_ALL,
 384         .cmd_per_lun            = CMD_PER_LUN,
 385         .use_clustering         = DISABLE_CLUSTERING
 386 };
 387
 388
 389 #include "scsi_module.c"
 390
 391 int gvp11_release(struct Scsi_Host *instance)
 392 {
 393 #ifdef MODULE
 394         DMA(instance)->CNTR = 0;
 395         release_mem_region(ZTWO_PADDR(instance->base), 256);
 396         free_irq(IRQ_AMIGA_PORTS, instance);
 397 #endif
 398         return 1;
 399 }
 400
 401 MODULE_LICENSE("GPL");