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