drivers/scsi/jazz_esp.c

   1 /*
   2  * jazz_esp.c: Driver for SCSI chip on Mips Magnum Boards (JAZZ architecture)
   3  *
   4  * Copyright (C) 1997 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
   5  *
   6  * jazz_esp is based on David S. Miller's ESP driver and cyber_esp
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/delay.h>
  12 #include <linux/types.h>
  13 #include <linux/string.h>
  14 #include <linux/slab.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/proc_fs.h>
  17 #include <linux/stat.h>
  18
  19 #include "scsi.h"
  20 #include <scsi/scsi_host.h>
  21 #include "NCR53C9x.h"
  22
  23 #include <asm/irq.h>
  24 #include <asm/jazz.h>
  25 #include <asm/jazzdma.h>
  26 #include <asm/dma.h>
  27
  28 #include <asm/pgtable.h>
  29
  30 static int  dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
  31 static int  dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd *sp);
  32 static void dma_dump_state(struct NCR_ESP *esp);
  33 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length);
  34 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length);
  35 static void dma_ints_off(struct NCR_ESP *esp);
  36 static void dma_ints_on(struct NCR_ESP *esp);
  37 static int  dma_irq_p(struct NCR_ESP *esp);
  38 static int  dma_ports_p(struct NCR_ESP *esp);
  39 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
  40 static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp);
  41 static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp);
  42 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp);
  43 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp);
  44 static void dma_advance_sg (struct scsi_cmnd *sp);
  45 static void dma_led_off(struct NCR_ESP *);
  46 static void dma_led_on(struct NCR_ESP *);
  47
  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 int jazz_esp_detect(Scsi_Host_Template *tpnt);
  56 static int jazz_esp_release(struct Scsi_Host *shost)
  57 {
  58         if (shost->irq)
  59                 free_irq(shost->irq, NULL);
  60         if (shost->dma_channel != 0xff)
  61                 free_dma(shost->dma_channel);
  62         if (shost->io_port && shost->n_io_port)
  63                 release_region(shost->io_port, shost->n_io_port);
  64         scsi_unregister(shost);
  65         return 0;
  66 }
  67
  68 static Scsi_Host_Template driver_template = {
  69         .proc_name              = "jazz_esp",
  70         .proc_info              = &esp_proc_info,
  71         .name                   = "ESP 100/100a/200",
  72         .detect                 = jazz_esp_detect,
  73         .slave_alloc            = esp_slave_alloc,
  74         .slave_destroy          = esp_slave_destroy,
  75         .release                = jazz_esp_release,
  76         .info                   = esp_info,
  77         .queuecommand           = esp_queue,
  78         .eh_abort_handler       = esp_abort,
  79         .eh_bus_reset_handler   = esp_reset,
  80         .can_queue              = 7,
  81         .this_id                = 7,
  82         .sg_tablesize           = SG_ALL,
  83         .cmd_per_lun            = 1,
  84         .use_clustering         = DISABLE_CLUSTERING,
  85 };
  86
  87 #include "scsi_module.c"
  88
  89 /***************************************************************** Detection */
  90 static int jazz_esp_detect(struct scsi_host_template *tpnt)
  91 {
  92     struct NCR_ESP *esp;
  93     struct ConfigDev *esp_dev;
  94
  95     /*
  96      * first assumption it is there:-)
  97      */
  98     if (1) {
  99         esp_dev = 0;
 100         esp = esp_allocate(tpnt, (void *) esp_dev);
 101
 102         /* Do command transfer with programmed I/O */
 103         esp->do_pio_cmds = 1;
 104
 105         /* Required functions */
 106         esp->dma_bytes_sent = &dma_bytes_sent;
 107         esp->dma_can_transfer = &dma_can_transfer;
 108         esp->dma_dump_state = &dma_dump_state;
 109         esp->dma_init_read = &dma_init_read;
 110         esp->dma_init_write = &dma_init_write;
 111         esp->dma_ints_off = &dma_ints_off;
 112         esp->dma_ints_on = &dma_ints_on;
 113         esp->dma_irq_p = &dma_irq_p;
 114         esp->dma_ports_p = &dma_ports_p;
 115         esp->dma_setup = &dma_setup;
 116
 117         /* Optional functions */
 118         esp->dma_barrier = 0;
 119         esp->dma_drain = 0;
 120         esp->dma_invalidate = 0;
 121         esp->dma_irq_entry = 0;
 122         esp->dma_irq_exit = 0;
 123         esp->dma_poll = 0;
 124         esp->dma_reset = 0;
 125         esp->dma_led_off = &dma_led_off;
 126         esp->dma_led_on = &dma_led_on;
 127
 128         /* virtual DMA functions */
 129         esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
 130         esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
 131         esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one;
 132         esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl;
 133         esp->dma_advance_sg = &dma_advance_sg;
 134
 135
 136         /* SCSI chip speed */
 137         esp->cfreq = 40000000;
 138
 139         /*
 140          * we don't give the address of DMA channel, but the number
 141          * of DMA channel, so we can use the jazz DMA functions
 142          *
 143          */
 144         esp->dregs = JAZZ_SCSI_DMA;
 145
 146         /* ESP register base */
 147         esp->eregs = (struct ESP_regs *)(JAZZ_SCSI_BASE);
 148
 149         /* Set the command buffer */
 150         esp->esp_command = (volatile unsigned char *)cmd_buffer;
 151
 152         /* get virtual dma address for command buffer */
 153         esp->esp_command_dvma = vdma_alloc(CPHYSADDR(cmd_buffer), sizeof (cmd_buffer));
 154
 155         esp->irq = JAZZ_SCSI_IRQ;
 156         request_irq(JAZZ_SCSI_IRQ, esp_intr, SA_INTERRUPT, "JAZZ SCSI",
 157                     esp->ehost);
 158
 159         /*
 160          * FIXME, look if the scsi id is available from NVRAM
 161          */
 162         esp->scsi_id = 7;
 163
 164         /* Check for differential SCSI-bus */
 165         /* What is this stuff? */
 166         esp->diff = 0;
 167
 168         esp_initialize(esp);
 169
 170         printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps,esps_in_use);
 171         esps_running = esps_in_use;
 172         return esps_in_use;
 173     }
 174     return 0;
 175 }
 176
 177 /************************************************************* DMA Functions */
 178 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
 179 {
 180     return fifo_count;
 181 }
 182
 183 static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd *sp)
 184 {
 185     /*
 186      * maximum DMA size is 1MB
 187      */
 188     unsigned long sz = sp->SCp.this_residual;
 189     if(sz > 0x100000)
 190         sz = 0x100000;
 191     return sz;
 192 }
 193
 194 static void dma_dump_state(struct NCR_ESP *esp)
 195 {
 196
 197     ESPLOG(("esp%d: dma -- enable <%08x> residue <%08x\n",
 198             esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_residue((int)esp->dregs)));
 199 }
 200
 201 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
 202 {
 203     dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
 204     vdma_disable ((int)esp->dregs);
 205     vdma_set_mode ((int)esp->dregs, DMA_MODE_READ);
 206     vdma_set_addr ((int)esp->dregs, vaddress);
 207     vdma_set_count ((int)esp->dregs, length);
 208     vdma_enable ((int)esp->dregs);
 209 }
 210
 211 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
 212 {
 213     dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
 214     vdma_disable ((int)esp->dregs);
 215     vdma_set_mode ((int)esp->dregs, DMA_MODE_WRITE);
 216     vdma_set_addr ((int)esp->dregs, vaddress);
 217     vdma_set_count ((int)esp->dregs, length);
 218     vdma_enable ((int)esp->dregs);
 219 }
 220
 221 static void dma_ints_off(struct NCR_ESP *esp)
 222 {
 223     disable_irq(esp->irq);
 224 }
 225
 226 static void dma_ints_on(struct NCR_ESP *esp)
 227 {
 228     enable_irq(esp->irq);
 229 }
 230
 231 static int dma_irq_p(struct NCR_ESP *esp)
 232 {
 233     return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
 234 }
 235
 236 static int dma_ports_p(struct NCR_ESP *esp)
 237 {
 238     int enable = vdma_get_enable((int)esp->dregs);
 239
 240     return (enable & R4030_CHNL_ENABLE);
 241 }
 242
 243 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
 244 {
 245     /*
 246      * On the Sparc, DMA_ST_WRITE means "move data from device to memory"
 247      * so when (write) is true, it actually means READ!
 248      */
 249     if(write){
 250         dma_init_read(esp, addr, count);
 251     } else {
 252         dma_init_write(esp, addr, count);
 253     }
 254 }
 255
 256 static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
 257 {
 258     sp->SCp.have_data_in = vdma_alloc(CPHYSADDR(sp->SCp.buffer), sp->SCp.this_residual);
 259     sp->SCp.ptr = (char *)((unsigned long)sp->SCp.have_data_in);
 260 }
 261
 262 static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
 263 {
 264     int sz = sp->SCp.buffers_residual;
 265     struct scatterlist *sg = (struct scatterlist *) sp->SCp.buffer;
 266
 267     while (sz >= 0) {
 268         sg[sz].dma_address = vdma_alloc(CPHYSADDR(page_address(sg[sz].page) + sg[sz].offset), sg[sz].length);
 269         sz--;
 270     }
 271     sp->SCp.ptr=(char *)(sp->SCp.buffer->dma_address);
 272 }
 273
 274 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
 275 {
 276     vdma_free(sp->SCp.have_data_in);
 277 }
 278
 279 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
 280 {
 281     int sz = sp->use_sg - 1;
 282     struct scatterlist *sg = (struct scatterlist *)sp->buffer;
 283
 284     while(sz >= 0) {
 285         vdma_free(sg[sz].dma_address);
 286         sz--;
 287     }
 288 }
 289
 290 static void dma_advance_sg (struct scsi_cmnd *sp)
 291 {
 292     sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
 293 }
 294
 295 #define JAZZ_HDC_LED   0xe000d100 /* FIXME, find correct address */
 296
 297 static void dma_led_off(struct NCR_ESP *esp)
 298 {
 299 #if 0
 300     *(unsigned char *)JAZZ_HDC_LED = 0;
 301 #endif
 302 }
 303
 304 static void dma_led_on(struct NCR_ESP *esp)
 305 {
 306 #if 0
 307     *(unsigned char *)JAZZ_HDC_LED = 1;
 308 #endif
 309 }
 310
 311 static struct scsi_host_template driver_template = {
 312         .proc_name              = "jazz_esp",
 313         .proc_info              = esp_proc_info,
 314         .name                   = "ESP 100/100a/200",
 315         .detect                 = jazz_esp_detect,
 316         .slave_alloc            = esp_slave_alloc,
 317         .slave_destroy          = esp_slave_destroy,
 318         .release                = jazz_esp_release,
 319         .info                   = esp_info,
 320         .queuecommand           = esp_queue,
 321         .eh_abort_handler       = esp_abort,
 322         .eh_bus_reset_handler   = esp_reset,
 323         .can_queue              = 7,
 324         .this_id                = 7,
 325         .sg_tablesize           = SG_ALL,
 326         .cmd_per_lun            = 1,
 327         .use_clustering         = DISABLE_CLUSTERING,
 328 };
 329 #include "scsi_module.c"