drivers/scsi/sun3x_esp.c

   1 /* sun3x_esp.c:  EnhancedScsiProcessor Sun3x SCSI driver code.
   2  *
   3  * (C) 1999 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
   4  *
   5  * Based on David S. Miller's esp driver
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/types.h>
  10 #include <linux/string.h>
  11 #include <linux/slab.h>
  12 #include <linux/blkdev.h>
  13 #include <linux/proc_fs.h>
  14 #include <linux/stat.h>
  15 #include <linux/delay.h>
  16 #include <linux/interrupt.h>
  17
  18 #include "scsi.h"
  19 #include "hosts.h"
  20 #include "NCR53C9x.h"
  21
  22 #include <asm/sun3x.h>
  23 #include <asm/dvma.h>
  24 #include <asm/irq.h>
  25
  26 extern struct NCR_ESP *espchain;
  27
  28 static void dma_barrier(struct NCR_ESP *esp);
  29 static int  dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
  30 static int  dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
  31 static void dma_drain(struct NCR_ESP *esp);
  32 static void dma_invalidate(struct NCR_ESP *esp);
  33 static void dma_dump_state(struct NCR_ESP *esp);
  34 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length);
  35 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length);
  36 static void dma_ints_off(struct NCR_ESP *esp);
  37 static void dma_ints_on(struct NCR_ESP *esp);
  38 static int  dma_irq_p(struct NCR_ESP *esp);
  39 static void dma_poll(struct NCR_ESP *esp, unsigned char *vaddr);
  40 static int  dma_ports_p(struct NCR_ESP *esp);
  41 static void dma_reset(struct NCR_ESP *esp);
  42 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
  43 static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp);
  44 static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp);
  45 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp);
  46 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp);
  47 static void dma_advance_sg (Scsi_Cmnd *sp);
  48
  49 static volatile unsigned char cmd_buffer[16];
  50                                 /* This is where all commands are put
  51                                  * before they are trasfered to the ESP chip
  52                                  * via PIO.
  53                                  */
  54
  55 /* Detecting ESP chips on the machine.  This is the simple and easy
  56  * version.
  57  */
  58 int sun3x_esp_detect(Scsi_Host_Template *tpnt)
  59 {
  60         struct NCR_ESP *esp;
  61         struct ConfigDev *esp_dev;
  62
  63         esp_dev = 0;
  64         esp = esp_allocate(tpnt, (void *) esp_dev);
  65
  66         /* Do command transfer with DMA */
  67         esp->do_pio_cmds = 0;
  68
  69         /* Required functions */
  70         esp->dma_bytes_sent = &dma_bytes_sent;
  71         esp->dma_can_transfer = &dma_can_transfer;
  72         esp->dma_dump_state = &dma_dump_state;
  73         esp->dma_init_read = &dma_init_read;
  74         esp->dma_init_write = &dma_init_write;
  75         esp->dma_ints_off = &dma_ints_off;
  76         esp->dma_ints_on = &dma_ints_on;
  77         esp->dma_irq_p = &dma_irq_p;
  78         esp->dma_ports_p = &dma_ports_p;
  79         esp->dma_setup = &dma_setup;
  80
  81         /* Optional functions */
  82         esp->dma_barrier = &dma_barrier;
  83         esp->dma_invalidate = &dma_invalidate;
  84         esp->dma_drain = &dma_drain;
  85         esp->dma_irq_entry = 0;
  86         esp->dma_irq_exit = 0;
  87         esp->dma_led_on = 0;
  88         esp->dma_led_off = 0;
  89         esp->dma_poll = &dma_poll;
  90         esp->dma_reset = &dma_reset;
  91
  92         /* virtual DMA functions */
  93         esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
  94         esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
  95         esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one;
  96         esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl;
  97         esp->dma_advance_sg = &dma_advance_sg;
  98
  99         /* SCSI chip speed */
 100         esp->cfreq = 20000000;
 101         esp->eregs = (struct ESP_regs *)(SUN3X_ESP_BASE);
 102         esp->dregs = (void *)SUN3X_ESP_DMA;
 103
 104 #if 0
 105         esp->esp_command = (volatile unsigned char *)cmd_buffer;
 106         esp->esp_command_dvma = dvma_map((unsigned long)cmd_buffer,
 107                                          sizeof (cmd_buffer));
 108 #else
 109         esp->esp_command = (volatile unsigned char *)dvma_malloc(DVMA_PAGE_SIZE);
 110         esp->esp_command_dvma = dvma_vtob((unsigned long)esp->esp_command);
 111 #endif
 112
 113         esp->irq = 2;
 114         if (request_irq(esp->irq, esp_intr, SA_INTERRUPT,
 115                         "SUN3X SCSI", esp->ehost)) {
 116                 esp_deallocate(esp);
 117                 return 0;
 118         }
 119
 120         esp->scsi_id = 7;
 121         esp->diff = 0;
 122
 123         esp_initialize(esp);
 124
 125         /* for reasons beyond my knowledge (and which should likely be fixed)
 126            sync mode doesn't work on a 3/80 at 5mhz.  but it does at 4. */
 127         esp->sync_defp = 0x3f;
 128
 129         printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps,
 130                esps_in_use);
 131         esps_running = esps_in_use;
 132         return esps_in_use;
 133 }
 134
 135 static void dma_do_drain(struct NCR_ESP *esp)
 136 {
 137         struct sparc_dma_registers *dregs =
 138                 (struct sparc_dma_registers *) esp->dregs;
 139
 140         int count = 500000;
 141
 142         while((dregs->cond_reg & DMA_PEND_READ) && (--count > 0))
 143                 udelay(1);
 144
 145         if(!count) {
 146                 printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg);
 147         }
 148
 149         dregs->cond_reg |= DMA_FIFO_STDRAIN;
 150
 151         count = 500000;
 152
 153         while((dregs->cond_reg & DMA_FIFO_ISDRAIN) && (--count > 0))
 154                 udelay(1);
 155
 156         if(!count) {
 157                 printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg);
 158         }
 159
 160 }
 161
 162 static void dma_barrier(struct NCR_ESP *esp)
 163 {
 164         struct sparc_dma_registers *dregs =
 165                 (struct sparc_dma_registers *) esp->dregs;
 166         int count = 500000;
 167
 168         while((dregs->cond_reg & DMA_PEND_READ) && (--count > 0))
 169                 udelay(1);
 170
 171         if(!count) {
 172                 printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg);
 173         }
 174
 175         dregs->cond_reg &= ~(DMA_ENABLE);
 176 }
 177
 178 /* This uses various DMA csr fields and the fifo flags count value to
 179  * determine how many bytes were successfully sent/received by the ESP.
 180  */
 181 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
 182 {
 183         struct sparc_dma_registers *dregs =
 184                 (struct sparc_dma_registers *) esp->dregs;
 185
 186         int rval = dregs->st_addr - esp->esp_command_dvma;
 187
 188         return rval - fifo_count;
 189 }
 190
 191 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
 192 {
 193         return sp->SCp.this_residual;
 194 }
 195
 196 static void dma_drain(struct NCR_ESP *esp)
 197 {
 198         struct sparc_dma_registers *dregs =
 199                 (struct sparc_dma_registers *) esp->dregs;
 200         int count = 500000;
 201
 202         if(dregs->cond_reg & DMA_FIFO_ISDRAIN) {
 203                 dregs->cond_reg |= DMA_FIFO_STDRAIN;
 204                 while((dregs->cond_reg & DMA_FIFO_ISDRAIN) && (--count > 0))
 205                         udelay(1);
 206                 if(!count) {
 207                         printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg);
 208                 }
 209
 210         }
 211 }
 212
 213 static void dma_invalidate(struct NCR_ESP *esp)
 214 {
 215         struct sparc_dma_registers *dregs =
 216                 (struct sparc_dma_registers *) esp->dregs;
 217
 218         __u32 tmp;
 219         int count = 500000;
 220
 221         while(((tmp = dregs->cond_reg) & DMA_PEND_READ) && (--count > 0))
 222                 udelay(1);
 223
 224         if(!count) {
 225                 printk("%s:%d timeout CSR %08lx\n", __FILE__, __LINE__, dregs->cond_reg);
 226         }
 227
 228         dregs->cond_reg = tmp | DMA_FIFO_INV;
 229         dregs->cond_reg &= ~DMA_FIFO_INV;
 230
 231 }
 232
 233 static void dma_dump_state(struct NCR_ESP *esp)
 234 {
 235         struct sparc_dma_registers *dregs =
 236                 (struct sparc_dma_registers *) esp->dregs;
 237
 238         ESPLOG(("esp%d: dma -- cond_reg<%08lx> addr<%08lx>\n",
 239                 esp->esp_id, dregs->cond_reg, dregs->st_addr));
 240 }
 241
 242 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
 243 {
 244         struct sparc_dma_registers *dregs =
 245                 (struct sparc_dma_registers *) esp->dregs;
 246
 247         dregs->st_addr = vaddress;
 248         dregs->cond_reg |= (DMA_ST_WRITE | DMA_ENABLE);
 249 }
 250
 251 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
 252 {
 253         struct sparc_dma_registers *dregs =
 254                 (struct sparc_dma_registers *) esp->dregs;
 255
 256         /* Set up the DMA counters */
 257
 258         dregs->st_addr = vaddress;
 259         dregs->cond_reg = ((dregs->cond_reg & ~(DMA_ST_WRITE)) | DMA_ENABLE);
 260 }
 261
 262 static void dma_ints_off(struct NCR_ESP *esp)
 263 {
 264         DMA_INTSOFF((struct sparc_dma_registers *) esp->dregs);
 265 }
 266
 267 static void dma_ints_on(struct NCR_ESP *esp)
 268 {
 269         DMA_INTSON((struct sparc_dma_registers *) esp->dregs);
 270 }
 271
 272 static int dma_irq_p(struct NCR_ESP *esp)
 273 {
 274         return DMA_IRQ_P((struct sparc_dma_registers *) esp->dregs);
 275 }
 276
 277 static void dma_poll(struct NCR_ESP *esp, unsigned char *vaddr)
 278 {
 279         int count = 50;
 280         dma_do_drain(esp);
 281
 282         /* Wait till the first bits settle. */
 283         while((*(volatile unsigned char *)vaddr == 0xff) && (--count > 0))
 284                 udelay(1);
 285
 286         if(!count) {
 287 //              printk("%s:%d timeout expire (data %02x)\n", __FILE__, __LINE__,
 288 //                     esp_read(esp->eregs->esp_fdata));
 289                 //mach_halt();
 290                 vaddr[0] = esp_read(esp->eregs->esp_fdata);
 291                 vaddr[1] = esp_read(esp->eregs->esp_fdata);
 292         }
 293
 294 }
 295
 296 static int dma_ports_p(struct NCR_ESP *esp)
 297 {
 298         return (((struct sparc_dma_registers *) esp->dregs)->cond_reg
 299                         & DMA_INT_ENAB);
 300 }
 301
 302 /* Resetting various pieces of the ESP scsi driver chipset/buses. */
 303 static void dma_reset(struct NCR_ESP *esp)
 304 {
 305         struct sparc_dma_registers *dregs =
 306                 (struct sparc_dma_registers *)esp->dregs;
 307
 308         /* Punt the DVMA into a known state. */
 309         dregs->cond_reg |= DMA_RST_SCSI;
 310         dregs->cond_reg &= ~(DMA_RST_SCSI);
 311         DMA_INTSON(dregs);
 312 }
 313
 314 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
 315 {
 316         struct sparc_dma_registers *dregs =
 317                 (struct sparc_dma_registers *) esp->dregs;
 318         unsigned long nreg = dregs->cond_reg;
 319
 320 //      printk("dma_setup %c addr %08x cnt %08x\n",
 321 //             write ? 'W' : 'R', addr, count);
 322
 323         dma_do_drain(esp);
 324
 325         if(write)
 326                 nreg |= DMA_ST_WRITE;
 327         else {
 328                 nreg &= ~(DMA_ST_WRITE);
 329         }
 330
 331         nreg |= DMA_ENABLE;
 332         dregs->cond_reg = nreg;
 333         dregs->st_addr = addr;
 334 }
 335
 336 static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp)
 337 {
 338     sp->SCp.have_data_in = dvma_map((unsigned long)sp->SCp.buffer,
 339                                        sp->SCp.this_residual);
 340     sp->SCp.ptr = (char *)((unsigned long)sp->SCp.have_data_in);
 341 }
 342
 343 static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp)
 344 {
 345     int sz = sp->SCp.buffers_residual;
 346     struct scatterlist *sg = sp->SCp.buffer;
 347
 348     while (sz >= 0) {
 349             sg[sz].dvma_address = dvma_map((unsigned long)page_address(sg[sz].page) +
 350                                            sg[sz].offset, sg[sz].length);
 351             sz--;
 352     }
 353     sp->SCp.ptr=(char *)((unsigned long)sp->SCp.buffer->dvma_address);
 354 }
 355
 356 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp)
 357 {
 358     dvma_unmap((char *)sp->SCp.have_data_in);
 359 }
 360
 361 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp)
 362 {
 363     int sz = sp->use_sg - 1;
 364     struct scatterlist *sg = (struct scatterlist *)sp->buffer;
 365
 366     while(sz >= 0) {
 367         dvma_unmap((char *)sg[sz].dvma_address);
 368         sz--;
 369     }
 370 }
 371
 372 static void dma_advance_sg (Scsi_Cmnd *sp)
 373 {
 374     sp->SCp.ptr = (char *)((unsigned long)sp->SCp.buffer->dvma_address);
 375 }
 376
 377
 378 static int esp_slave_alloc(Scsi_Device *SDptr)
 379 {
 380         struct esp_device *esp_dev =
 381                 kmalloc(sizeof(struct esp_device), GFP_ATOMIC);
 382
 383         if (!esp_dev)
 384                 return -ENOMEM;
 385         memset(esp_dev, 0, sizeof(struct esp_device));
 386         SDptr->hostdata = esp_dev;
 387         return 0;
 388 }
 389
 390 static void esp_slave_destroy(Scsi_Device *SDptr)
 391 {
 392         struct NCR_ESP *esp = (struct NCR_ESP *) SDptr->host->hostdata;
 393
 394         esp->targets_present &= ~(1 << SDptr->id);
 395         kfree(SDptr->hostdata);
 396         SDptr->hostdata = NULL;
 397 }
 398
 399
 400 static int sun3x_esp_release(struct Scsi_Host *instance)
 401 {
 402         /* this code does not support being compiled as a module */
 403         return 1;
 404
 405 }
 406
 407 static Scsi_Host_Template driver_template = {
 408         .proc_name              = "esp",
 409         .proc_info              = &esp_proc_info,
 410         .name                   = "Sun ESP 100/100a/200",
 411         .detect                 = sun3x_esp_detect,
 412         .release                = sun3x_esp_release,
 413         .slave_alloc            = esp_slave_alloc,
 414         .slave_destroy          = esp_slave_destroy,
 415         .info                   = esp_info,
 416         .queuecommand           = esp_queue,
 417         .eh_abort_handler       = esp_abort,
 418         .eh_bus_reset_handler   = esp_reset,
 419         .can_queue              = 7,
 420         .this_id                = 7,
 421         .sg_tablesize           = SG_ALL,
 422         .cmd_per_lun            = 1,
 423         .use_clustering         = DISABLE_CLUSTERING,
 424 };
 425
 426
 427 #include "scsi_module.c"
 428
 429 MODULE_LICENSE("GPL");