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