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/sched.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 #define DMA(ptr) ((gvp11_scsiregs *)((ptr)->base))
  25 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
  26
  27 static irqreturn_t gvp11_intr (int irq, void *_instance, struct pt_regs *fp)
  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 (Scsi_Cmnd *cmd, int dir_in)
  51 {
  52     unsigned short cntr = GVP11_DMAC_INT_ENABLE;
  53     unsigned long addr = virt_to_bus(cmd->SCp.ptr);
  54     int bank_mask;
  55     static int scsi_alloc_out_of_range = 0;
  56
  57     /* use bounce buffer if the physical address is bad */
  58     if (addr & HDATA(cmd->device->host)->dma_xfer_mask ||
  59         (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
  60     {
  61         HDATA(cmd->device->host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
  62             & ~0x1ff;
  63
  64         if( !scsi_alloc_out_of_range ) {
  65             HDATA(cmd->device->host)->dma_bounce_buffer =
  66                 kmalloc (HDATA(cmd->device->host)->dma_bounce_len, GFP_KERNEL);
  67             HDATA(cmd->device->host)->dma_buffer_pool = BUF_SCSI_ALLOCED;
  68         }
  69
  70         if (scsi_alloc_out_of_range ||
  71             !HDATA(cmd->device->host)->dma_bounce_buffer) {
  72             HDATA(cmd->device->host)->dma_bounce_buffer =
  73                 amiga_chip_alloc(HDATA(cmd->device->host)->dma_bounce_len,
  74                                        "GVP II SCSI Bounce Buffer");
  75
  76             if(!HDATA(cmd->device->host)->dma_bounce_buffer)
  77             {
  78                 HDATA(cmd->device->host)->dma_bounce_len = 0;
  79                 return 1;
  80             }
  81
  82             HDATA(cmd->device->host)->dma_buffer_pool = BUF_CHIP_ALLOCED;
  83         }
  84
  85         /* check if the address of the bounce buffer is OK */
  86         addr = virt_to_bus(HDATA(cmd->device->host)->dma_bounce_buffer);
  87
  88         if (addr & HDATA(cmd->device->host)->dma_xfer_mask) {
  89             /* fall back to Chip RAM if address out of range */
  90             if( HDATA(cmd->device->host)->dma_buffer_pool == BUF_SCSI_ALLOCED) {
  91                 kfree (HDATA(cmd->device->host)->dma_bounce_buffer);
  92                 scsi_alloc_out_of_range = 1;
  93             } else {
  94                 amiga_chip_free (HDATA(cmd->device->host)->dma_bounce_buffer);
  95             }
  96
  97             HDATA(cmd->device->host)->dma_bounce_buffer =
  98                 amiga_chip_alloc(HDATA(cmd->device->host)->dma_bounce_len,
  99                                        "GVP II SCSI Bounce Buffer");
 100
 101             if(!HDATA(cmd->device->host)->dma_bounce_buffer)
 102             {
 103                 HDATA(cmd->device->host)->dma_bounce_len = 0;
 104                 return 1;
 105             }
 106
 107             addr = virt_to_bus(HDATA(cmd->device->host)->dma_bounce_buffer);
 108             HDATA(cmd->device->host)->dma_buffer_pool = BUF_CHIP_ALLOCED;
 109         }
 110
 111         if (!dir_in) {
 112             /* copy to bounce buffer for a write */
 113             memcpy (HDATA(cmd->device->host)->dma_bounce_buffer,
 114                     cmd->SCp.ptr, cmd->SCp.this_residual);
 115         }
 116     }
 117
 118     /* setup dma direction */
 119     if (!dir_in)
 120         cntr |= GVP11_DMAC_DIR_WRITE;
 121
 122     HDATA(cmd->device->host)->dma_dir = dir_in;
 123     DMA(cmd->device->host)->CNTR = cntr;
 124
 125     /* setup DMA *physical* address */
 126     DMA(cmd->device->host)->ACR = addr;
 127
 128     if (dir_in)
 129         /* invalidate any cache */
 130         cache_clear (addr, cmd->SCp.this_residual);
 131     else
 132         /* push any dirty cache */
 133         cache_push (addr, cmd->SCp.this_residual);
 134
 135     if ((bank_mask = (~HDATA(cmd->device->host)->dma_xfer_mask >> 18) & 0x01c0))
 136             DMA(cmd->device->host)->BANK = bank_mask & (addr >> 18);
 137
 138     /* start DMA */
 139     DMA(cmd->device->host)->ST_DMA = 1;
 140
 141     /* return success */
 142     return 0;
 143 }
 144
 145 static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt,
 146                       int status)
 147 {
 148     /* stop DMA */
 149     DMA(instance)->SP_DMA = 1;
 150     /* remove write bit from CONTROL bits */
 151     DMA(instance)->CNTR = GVP11_DMAC_INT_ENABLE;
 152
 153     /* copy from a bounce buffer, if necessary */
 154     if (status && HDATA(instance)->dma_bounce_buffer) {
 155         if (HDATA(instance)->dma_dir && SCpnt)
 156             memcpy (SCpnt->SCp.ptr,
 157                     HDATA(instance)->dma_bounce_buffer,
 158                     SCpnt->SCp.this_residual);
 159
 160         if (HDATA(instance)->dma_buffer_pool == BUF_SCSI_ALLOCED)
 161             kfree (HDATA(instance)->dma_bounce_buffer);
 162         else
 163             amiga_chip_free(HDATA(instance)->dma_bounce_buffer);
 164
 165         HDATA(instance)->dma_bounce_buffer = NULL;
 166         HDATA(instance)->dma_bounce_len = 0;
 167     }
 168 }
 169
 170 #define CHECK_WD33C93
 171
 172 int __init gvp11_detect(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     wd33c93_regs regs;
 181     int num_gvp11 = 0;
 182 #ifdef CHECK_WD33C93
 183     volatile unsigned char *sasr_3393, *scmd_3393;
 184     unsigned char save_sasr;
 185     unsigned char q, qq;
 186 #endif
 187
 188     if (!MACH_IS_AMIGA || called)
 189         return 0;
 190     called = 1;
 191
 192     tpnt->proc_name = "GVP11";
 193     tpnt->proc_info = &wd33c93_proc_info;
 194
 195     while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
 196         /*
 197          * This should (hopefully) be the correct way to identify
 198          * all the different GVP SCSI controllers (except for the
 199          * SERIES I though).
 200          */
 201
 202         if (z->id == ZORRO_PROD_GVP_COMBO_030_R3_SCSI ||
 203             z->id == ZORRO_PROD_GVP_SERIES_II)
 204             default_dma_xfer_mask = ~0x00ffffff;
 205         else if (z->id == ZORRO_PROD_GVP_GFORCE_030_SCSI ||
 206                  z->id == ZORRO_PROD_GVP_A530_SCSI ||
 207                  z->id == ZORRO_PROD_GVP_COMBO_030_R4_SCSI)
 208             default_dma_xfer_mask = ~0x01ffffff;
 209         else if (z->id == ZORRO_PROD_GVP_A1291 ||
 210                  z->id == ZORRO_PROD_GVP_GFORCE_040_SCSI_1)
 211             default_dma_xfer_mask = ~0x07ffffff;
 212         else
 213             continue;
 214
 215         /*
 216          * Rumors state that some GVP ram boards use the same product
 217          * code as the SCSI controllers. Therefore if the board-size
 218          * is not 64KB we asume it is a ram board and bail out.
 219          */
 220         if (z->resource.end-z->resource.start != 0xffff)
 221                 continue;
 222
 223         address = z->resource.start;
 224         if (!request_mem_region(address, 256, "wd33c93"))
 225             continue;
 226
 227 #ifdef CHECK_WD33C93
 228
 229         /*
 230          * These darn GVP boards are a problem - it can be tough to tell
 231          * whether or not they include a SCSI controller. This is the
 232          * ultimate Yet-Another-GVP-Detection-Hack in that it actually
 233          * probes for a WD33c93 chip: If we find one, it's extremely
 234          * likely that this card supports SCSI, regardless of Product_
 235          * Code, Board_Size, etc.
 236          */
 237
 238     /* Get pointers to the presumed register locations and save contents */
 239
 240         sasr_3393 = &(((gvp11_scsiregs *)(ZTWO_VADDR(address)))->SASR);
 241         scmd_3393 = &(((gvp11_scsiregs *)(ZTWO_VADDR(address)))->SCMD);
 242         save_sasr = *sasr_3393;
 243
 244     /* First test the AuxStatus Reg */
 245
 246         q = *sasr_3393;         /* read it */
 247         if (q & 0x08)           /* bit 3 should always be clear */
 248                 goto release;
 249         *sasr_3393 = WD_AUXILIARY_STATUS;        /* setup indirect address */
 250         if (*sasr_3393 == WD_AUXILIARY_STATUS) { /* shouldn't retain the write */
 251                 *sasr_3393 = save_sasr; /* Oops - restore this byte */
 252                 goto release;
 253                 }
 254         if (*sasr_3393 != q) {  /* should still read the same */
 255                 *sasr_3393 = save_sasr; /* Oops - restore this byte */
 256                 goto release;
 257                 }
 258         if (*scmd_3393 != q)    /* and so should the image at 0x1f */
 259                 goto release;
 260
 261
 262     /* Ok, we probably have a wd33c93, but let's check a few other places
 263      * for good measure. Make sure that this works for both 'A and 'B
 264      * chip versions.
 265      */
 266
 267         *sasr_3393 = WD_SCSI_STATUS;
 268         q = *scmd_3393;
 269         *sasr_3393 = WD_SCSI_STATUS;
 270         *scmd_3393 = ~q;
 271         *sasr_3393 = WD_SCSI_STATUS;
 272         qq = *scmd_3393;
 273         *sasr_3393 = WD_SCSI_STATUS;
 274         *scmd_3393 = q;
 275         if (qq != q)                    /* should be read only */
 276                 goto release;
 277         *sasr_3393 = 0x1e;      /* this register is unimplemented */
 278         q = *scmd_3393;
 279         *sasr_3393 = 0x1e;
 280         *scmd_3393 = ~q;
 281         *sasr_3393 = 0x1e;
 282         qq = *scmd_3393;
 283         *sasr_3393 = 0x1e;
 284         *scmd_3393 = q;
 285         if (qq != q || qq != 0xff)      /* should be read only, all 1's */
 286                 goto release;
 287         *sasr_3393 = WD_TIMEOUT_PERIOD;
 288         q = *scmd_3393;
 289         *sasr_3393 = WD_TIMEOUT_PERIOD;
 290         *scmd_3393 = ~q;
 291         *sasr_3393 = WD_TIMEOUT_PERIOD;
 292         qq = *scmd_3393;
 293         *sasr_3393 = WD_TIMEOUT_PERIOD;
 294         *scmd_3393 = q;
 295         if (qq != (~q & 0xff))          /* should be read/write */
 296                 goto release;
 297 #endif
 298
 299         instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));
 300         if(instance == NULL)
 301                 goto release;
 302         instance->base = ZTWO_VADDR(address);
 303         instance->irq = IRQ_AMIGA_PORTS;
 304         instance->unique_id = z->slotaddr;
 305
 306         if (gvp11_xfer_mask)
 307                 HDATA(instance)->dma_xfer_mask = gvp11_xfer_mask;
 308         else
 309                 HDATA(instance)->dma_xfer_mask = default_dma_xfer_mask;
 310
 311
 312         DMA(instance)->secret2 = 1;
 313         DMA(instance)->secret1 = 0;
 314         DMA(instance)->secret3 = 15;
 315         while (DMA(instance)->CNTR & GVP11_DMAC_BUSY) ;
 316         DMA(instance)->CNTR = 0;
 317
 318         DMA(instance)->BANK = 0;
 319
 320         epc = *(unsigned short *)(ZTWO_VADDR(address) + 0x8000);
 321
 322         /*
 323          * Check for 14MHz SCSI clock
 324          */
 325         regs.SASR = &(DMA(instance)->SASR);
 326         regs.SCMD = &(DMA(instance)->SCMD);
 327         wd33c93_init(instance, regs, dma_setup, dma_stop,
 328                      (epc & GVP_SCSICLKMASK) ? WD33C93_FS_8_10
 329                                              : WD33C93_FS_12_15);
 330
 331         request_irq(IRQ_AMIGA_PORTS, gvp11_intr, SA_SHIRQ, "GVP11 SCSI",
 332                     instance);
 333         DMA(instance)->CNTR = GVP11_DMAC_INT_ENABLE;
 334         num_gvp11++;
 335         continue;
 336
 337 release:
 338         release_mem_region(address, 256);
 339     }
 340
 341     return num_gvp11;
 342 }
 343
 344 static int gvp11_bus_reset(Scsi_Cmnd *cmd)
 345 {
 346         /* FIXME perform bus-specific reset */
 347
 348         /* FIXME 2: shouldn't we no-op this function (return
 349            FAILED), and fall back to host reset function,
 350            wd33c93_host_reset ? */
 351
 352         spin_lock_irq(cmd->device->host->host_lock);
 353         wd33c93_host_reset(cmd);
 354         spin_unlock_irq(cmd->device->host->host_lock);
 355
 356         return SUCCESS;
 357 }
 358
 359
 360 #define HOSTS_C
 361
 362 #include "gvp11.h"
 363
 364 static Scsi_Host_Template driver_template = {
 365         .proc_name              = "GVP11",
 366         .name                   = "GVP Series II SCSI",
 367         .detect                 = gvp11_detect,
 368         .release                = gvp11_release,
 369         .queuecommand           = wd33c93_queuecommand,
 370         .eh_abort_handler       = wd33c93_abort,
 371         .eh_bus_reset_handler   = gvp11_bus_reset,
 372         .eh_host_reset_handler  = wd33c93_host_reset,
 373         .can_queue              = CAN_QUEUE,
 374         .this_id                = 7,
 375         .sg_tablesize           = SG_ALL,
 376         .cmd_per_lun            = CMD_PER_LUN,
 377         .use_clustering         = DISABLE_CLUSTERING
 378 };
 379
 380
 381 #include "scsi_module.c"
 382
 383 int gvp11_release(struct Scsi_Host *instance)
 384 {
 385 #ifdef MODULE
 386     DMA(instance)->CNTR = 0;
 387     release_mem_region(ZTWO_PADDR(instance->base), 256);
 388     free_irq(IRQ_AMIGA_PORTS, instance);
 389     wd33c93_release();
 390 #endif
 391     return 1;
 392 }
 393
 394 MODULE_LICENSE("GPL");