git.oblomov.eu Git - linux-2.6/blob - drivers/scsi/gvp11.c

   1 #include <linux/types.h>
   2 #include <linux/mm.h>
   3 #include <linux/blkdev.h>
   4 #include <linux/init.h>
   5 #include <linux/interrupt.h>
   6
   7 #include <asm/setup.h>
   8 #include <asm/page.h>
   9 #include <asm/pgtable.h>
  10 #include <asm/amigaints.h>
  11 #include <asm/amigahw.h>
  12 #include <linux/zorro.h>
  13 #include <asm/irq.h>
  14 #include <linux/spinlock.h>
  15
  16 #include "scsi.h"
  17 #include <scsi/scsi_host.h>
  18 #include "wd33c93.h"
  19 #include "gvp11.h"
  20
  21 #include<linux/stat.h>
  22
  23 #define DMA(ptr) ((gvp11_scsiregs *)((ptr)->base))
  24 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
  25
  26 static irqreturn_t gvp11_intr (int irq, void *_instance)
  27 {
  28     unsigned long flags;
  29     unsigned int status;
  30     struct Scsi_Host *instance = (struct Scsi_Host *)_instance;
  31
  32     status = DMA(instance)->CNTR;
  33     if (!(status & GVP11_DMAC_INT_PENDING))
  34         return IRQ_NONE;
  35
  36     spin_lock_irqsave(instance->host_lock, flags);
  37     wd33c93_intr(instance);
  38     spin_unlock_irqrestore(instance->host_lock, flags);
  39     return IRQ_HANDLED;
  40 }
  41
  42 static int gvp11_xfer_mask = 0;
  43
  44 void gvp11_setup (char *str, int *ints)
  45 {
  46     gvp11_xfer_mask = ints[1];
  47 }
  48
  49 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
  50 {
  51     unsigned short cntr = GVP11_DMAC_INT_ENABLE;
  52     unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  53     int bank_mask;
  54     static int scsi_alloc_out_of_range = 0;
  55
  56     /* use bounce buffer if the physical address is bad */
  57     if (addr & HDATA(cmd->device->host)->dma_xfer_mask)
  58     {
  59         HDATA(cmd->device->host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
  60             & ~0x1ff;
  61
  62         if( !scsi_alloc_out_of_range ) {
  63             HDATA(cmd->device->host)->dma_bounce_buffer =
  64                 kmalloc (HDATA(cmd->device->host)->dma_bounce_len, GFP_KERNEL);
  65             HDATA(cmd->device->host)->dma_buffer_pool = BUF_SCSI_ALLOCED;
  66         }
  67
  68         if (scsi_alloc_out_of_range ||
  69             !HDATA(cmd->device->host)->dma_bounce_buffer) {
  70             HDATA(cmd->device->host)->dma_bounce_buffer =
  71                 amiga_chip_alloc(HDATA(cmd->device->host)->dma_bounce_len,
  72                                        "GVP II SCSI Bounce Buffer");
  73
  74             if(!HDATA(cmd->device->host)->dma_bounce_buffer)
  75             {
  76                 HDATA(cmd->device->host)->dma_bounce_len = 0;
  77                 return 1;
  78             }
  79
  80             HDATA(cmd->device->host)->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(cmd->device->host)->dma_bounce_buffer);
  85
  86         if (addr & HDATA(cmd->device->host)->dma_xfer_mask) {
  87             /* fall back to Chip RAM if address out of range */
  88             if( HDATA(cmd->device->host)->dma_buffer_pool == BUF_SCSI_ALLOCED) {
  89                 kfree (HDATA(cmd->device->host)->dma_bounce_buffer);
  90                 scsi_alloc_out_of_range = 1;
  91             } else {
  92                 amiga_chip_free (HDATA(cmd->device->host)->dma_bounce_buffer);
  93             }
  94
  95             HDATA(cmd->device->host)->dma_bounce_buffer =
  96                 amiga_chip_alloc(HDATA(cmd->device->host)->dma_bounce_len,
  97                                        "GVP II SCSI Bounce Buffer");
  98
  99             if(!HDATA(cmd->device->host)->dma_bounce_buffer)
 100             {
 101                 HDATA(cmd->device->host)->dma_bounce_len = 0;
 102                 return 1;
 103             }
 104
 105             addr = virt_to_bus(HDATA(cmd->device->host)->dma_bounce_buffer);
 106             HDATA(cmd->device->host)->dma_buffer_pool = BUF_CHIP_ALLOCED;
 107         }
 108
 109         if (!dir_in) {
 110             /* copy to bounce buffer for a write */
 111             memcpy (HDATA(cmd->device->host)->dma_bounce_buffer,
 112                     cmd->SCp.ptr, cmd->SCp.this_residual);
 113         }
 114     }
 115
 116     /* setup dma direction */
 117     if (!dir_in)
 118         cntr |= GVP11_DMAC_DIR_WRITE;
 119
 120     HDATA(cmd->device->host)->dma_dir = dir_in;
 121     DMA(cmd->device->host)->CNTR = cntr;
 122
 123     /* setup DMA *physical* address */
 124     DMA(cmd->device->host)->ACR = addr;
 125
 126     if (dir_in)
 127         /* invalidate any cache */
 128         cache_clear (addr, cmd->SCp.this_residual);
 129     else
 130         /* push any dirty cache */
 131         cache_push (addr, cmd->SCp.this_residual);
 132
 133     if ((bank_mask = (~HDATA(cmd->device->host)->dma_xfer_mask >> 18) & 0x01c0))
 134             DMA(cmd->device->host)->BANK = bank_mask & (addr >> 18);
 135
 136     /* start DMA */
 137     DMA(cmd->device->host)->ST_DMA = 1;
 138
 139     /* return success */
 140     return 0;
 141 }
 142
 143 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 144                      int status)
 145 {
 146     /* stop DMA */
 147     DMA(instance)->SP_DMA = 1;
 148     /* remove write bit from CONTROL bits */
 149     DMA(instance)->CNTR = GVP11_DMAC_INT_ENABLE;
 150
 151     /* copy from a bounce buffer, if necessary */
 152     if (status && HDATA(instance)->dma_bounce_buffer) {
 153         if (HDATA(instance)->dma_dir && SCpnt)
 154             memcpy (SCpnt->SCp.ptr,
 155                     HDATA(instance)->dma_bounce_buffer,
 156                     SCpnt->SCp.this_residual);
 157
 158         if (HDATA(instance)->dma_buffer_pool == BUF_SCSI_ALLOCED)
 159             kfree (HDATA(instance)->dma_bounce_buffer);
 160         else
 161             amiga_chip_free(HDATA(instance)->dma_bounce_buffer);
 162
 163         HDATA(instance)->dma_bounce_buffer = NULL;
 164         HDATA(instance)->dma_bounce_len = 0;
 165     }
 166 }
 167
 168 #define CHECK_WD33C93
 169
 170 int __init gvp11_detect(struct scsi_host_template *tpnt)
 171 {
 172     static unsigned char called = 0;
 173     struct Scsi_Host *instance;
 174     unsigned long address;
 175     unsigned int epc;
 176     struct zorro_dev *z = NULL;
 177     unsigned int default_dma_xfer_mask;
 178     wd33c93_regs regs;
 179     int num_gvp11 = 0;
 180 #ifdef CHECK_WD33C93
 181     volatile unsigned char *sasr_3393, *scmd_3393;
 182     unsigned char save_sasr;
 183     unsigned char q, qq;
 184 #endif
 185
 186     if (!MACH_IS_AMIGA || called)
 187         return 0;
 188     called = 1;
 189
 190     tpnt->proc_name = "GVP11";
 191     tpnt->proc_info = &wd33c93_proc_info;
 192
 193     while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 194         /*
 195          * This should (hopefully) be the correct way to identify
 196          * all the different GVP SCSI controllers (except for the
 197          * SERIES I though).
 198          */
 199
 200         if (z->id == ZORRO_PROD_GVP_COMBO_030_R3_SCSI ||
 201             z->id == ZORRO_PROD_GVP_SERIES_II)
 202             default_dma_xfer_mask = ~0x00ffffff;
 203         else if (z->id == ZORRO_PROD_GVP_GFORCE_030_SCSI ||
 204                  z->id == ZORRO_PROD_GVP_A530_SCSI ||
 205                  z->id == ZORRO_PROD_GVP_COMBO_030_R4_SCSI)
 206             default_dma_xfer_mask = ~0x01ffffff;
 207         else if (z->id == ZORRO_PROD_GVP_A1291 ||
 208                  z->id == ZORRO_PROD_GVP_GFORCE_040_SCSI_1)
 209             default_dma_xfer_mask = ~0x07ffffff;
 210         else
 211             continue;
 212
 213         /*
 214          * Rumors state that some GVP ram boards use the same product
 215          * code as the SCSI controllers. Therefore if the board-size
 216          * is not 64KB we asume it is a ram board and bail out.
 217          */
 218         if (z->resource.end-z->resource.start != 0xffff)
 219                 continue;
 220
 221         address = z->resource.start;
 222         if (!request_mem_region(address, 256, "wd33c93"))
 223             continue;
 224
 225 #ifdef CHECK_WD33C93
 226
 227         /*
 228          * These darn GVP boards are a problem - it can be tough to tell
 229          * whether or not they include a SCSI controller. This is the
 230          * ultimate Yet-Another-GVP-Detection-Hack in that it actually
 231          * probes for a WD33c93 chip: If we find one, it's extremely
 232          * likely that this card supports SCSI, regardless of Product_
 233          * Code, Board_Size, etc.
 234          */
 235
 236     /* Get pointers to the presumed register locations and save contents */
 237
 238         sasr_3393 = &(((gvp11_scsiregs *)(ZTWO_VADDR(address)))->SASR);
 239         scmd_3393 = &(((gvp11_scsiregs *)(ZTWO_VADDR(address)))->SCMD);
 240         save_sasr = *sasr_3393;
 241
 242     /* First test the AuxStatus Reg */
 243
 244         q = *sasr_3393;         /* read it */
 245         if (q & 0x08)           /* bit 3 should always be clear */
 246                 goto release;
 247         *sasr_3393 = WD_AUXILIARY_STATUS;        /* setup indirect address */
 248         if (*sasr_3393 == WD_AUXILIARY_STATUS) { /* shouldn't retain the write */
 249                 *sasr_3393 = save_sasr; /* Oops - restore this byte */
 250                 goto release;
 251                 }
 252         if (*sasr_3393 != q) {  /* should still read the same */
 253                 *sasr_3393 = save_sasr; /* Oops - restore this byte */
 254                 goto release;
 255                 }
 256         if (*scmd_3393 != q)    /* and so should the image at 0x1f */
 257                 goto release;
 258
 259
 260     /* Ok, we probably have a wd33c93, but let's check a few other places
 261      * for good measure. Make sure that this works for both 'A and 'B
 262      * chip versions.
 263      */
 264
 265         *sasr_3393 = WD_SCSI_STATUS;
 266         q = *scmd_3393;
 267         *sasr_3393 = WD_SCSI_STATUS;
 268         *scmd_3393 = ~q;
 269         *sasr_3393 = WD_SCSI_STATUS;
 270         qq = *scmd_3393;
 271         *sasr_3393 = WD_SCSI_STATUS;
 272         *scmd_3393 = q;
 273         if (qq != q)                    /* should be read only */
 274                 goto release;
 275         *sasr_3393 = 0x1e;      /* this register is unimplemented */
 276         q = *scmd_3393;
 277         *sasr_3393 = 0x1e;
 278         *scmd_3393 = ~q;
 279         *sasr_3393 = 0x1e;
 280         qq = *scmd_3393;
 281         *sasr_3393 = 0x1e;
 282         *scmd_3393 = q;
 283         if (qq != q || qq != 0xff)      /* should be read only, all 1's */
 284                 goto release;
 285         *sasr_3393 = WD_TIMEOUT_PERIOD;
 286         q = *scmd_3393;
 287         *sasr_3393 = WD_TIMEOUT_PERIOD;
 288         *scmd_3393 = ~q;
 289         *sasr_3393 = WD_TIMEOUT_PERIOD;
 290         qq = *scmd_3393;
 291         *sasr_3393 = WD_TIMEOUT_PERIOD;
 292         *scmd_3393 = q;
 293         if (qq != (~q & 0xff))          /* should be read/write */
 294                 goto release;
 295 #endif
 296
 297         instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));
 298         if(instance == NULL)
 299                 goto release;
 300         instance->base = ZTWO_VADDR(address);
 301         instance->irq = IRQ_AMIGA_PORTS;
 302         instance->unique_id = z->slotaddr;
 303
 304         if (gvp11_xfer_mask)
 305                 HDATA(instance)->dma_xfer_mask = gvp11_xfer_mask;
 306         else
 307                 HDATA(instance)->dma_xfer_mask = default_dma_xfer_mask;
 308
 309
 310         DMA(instance)->secret2 = 1;
 311         DMA(instance)->secret1 = 0;
 312         DMA(instance)->secret3 = 15;
 313         while (DMA(instance)->CNTR & GVP11_DMAC_BUSY) ;
 314         DMA(instance)->CNTR = 0;
 315
 316         DMA(instance)->BANK = 0;
 317
 318         epc = *(unsigned short *)(ZTWO_VADDR(address) + 0x8000);
 319
 320         /*
 321          * Check for 14MHz SCSI clock
 322          */
 323         regs.SASR = &(DMA(instance)->SASR);
 324         regs.SCMD = &(DMA(instance)->SCMD);
 325         HDATA(instance)->no_sync = 0xff;
 326         HDATA(instance)->fast = 0;
 327         HDATA(instance)->dma_mode = CTRL_DMA;
 328         wd33c93_init(instance, regs, dma_setup, dma_stop,
 329                      (epc & GVP_SCSICLKMASK) ? WD33C93_FS_8_10
 330                                              : WD33C93_FS_12_15);
 331
 332         if (request_irq(IRQ_AMIGA_PORTS, gvp11_intr, IRQF_SHARED, "GVP11 SCSI",
 333                         instance))
 334                 goto unregister;
 335         DMA(instance)->CNTR = GVP11_DMAC_INT_ENABLE;
 336         num_gvp11++;
 337         continue;
 338
 339 unregister:
 340         scsi_unregister(instance);
 341         wd33c93_release();
 342 release:
 343         release_mem_region(address, 256);
 344     }
 345
 346     return num_gvp11;
 347 }
 348
 349 static int gvp11_bus_reset(struct scsi_cmnd *cmd)
 350 {
 351         /* FIXME perform bus-specific reset */
 352
 353         /* FIXME 2: shouldn't we no-op this function (return
 354            FAILED), and fall back to host reset function,
 355            wd33c93_host_reset ? */
 356
 357         spin_lock_irq(cmd->device->host->host_lock);
 358         wd33c93_host_reset(cmd);
 359         spin_unlock_irq(cmd->device->host->host_lock);
 360
 361         return SUCCESS;
 362 }
 363
 364
 365 #define HOSTS_C
 366
 367 #include "gvp11.h"
 368
 369 static struct scsi_host_template driver_template = {
 370         .proc_name              = "GVP11",
 371         .name                   = "GVP Series II SCSI",
 372         .detect                 = gvp11_detect,
 373         .release                = gvp11_release,
 374         .queuecommand           = wd33c93_queuecommand,
 375         .eh_abort_handler       = wd33c93_abort,
 376         .eh_bus_reset_handler   = gvp11_bus_reset,
 377         .eh_host_reset_handler  = wd33c93_host_reset,
 378         .can_queue              = CAN_QUEUE,
 379         .this_id                = 7,
 380         .sg_tablesize           = SG_ALL,
 381         .cmd_per_lun            = CMD_PER_LUN,
 382         .use_clustering         = DISABLE_CLUSTERING
 383 };
 384
 385
 386 #include "scsi_module.c"
 387
 388 int gvp11_release(struct Scsi_Host *instance)
 389 {
 390 #ifdef MODULE
 391     DMA(instance)->CNTR = 0;
 392     release_mem_region(ZTWO_PADDR(instance->base), 256);
 393     free_irq(IRQ_AMIGA_PORTS, instance);
 394     wd33c93_release();
 395 #endif
 396     return 1;
 397 }
 398
 399 MODULE_LICENSE("GPL");