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(struct 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 /***************************************************************** Detection */
  69 static int jazz_esp_detect(struct scsi_host_template *tpnt)
  70 {
  71     struct NCR_ESP *esp;
  72     struct ConfigDev *esp_dev;
  73
  74     /*
  75      * first assumption it is there:-)
  76      */
  77     if (1) {
  78         esp_dev = 0;
  79         esp = esp_allocate(tpnt, (void *) esp_dev);
  80
  81         /* Do command transfer with programmed I/O */
  82         esp->do_pio_cmds = 1;
  83
  84         /* Required functions */
  85         esp->dma_bytes_sent = &dma_bytes_sent;
  86         esp->dma_can_transfer = &dma_can_transfer;
  87         esp->dma_dump_state = &dma_dump_state;
  88         esp->dma_init_read = &dma_init_read;
  89         esp->dma_init_write = &dma_init_write;
  90         esp->dma_ints_off = &dma_ints_off;
  91         esp->dma_ints_on = &dma_ints_on;
  92         esp->dma_irq_p = &dma_irq_p;
  93         esp->dma_ports_p = &dma_ports_p;
  94         esp->dma_setup = &dma_setup;
  95
  96         /* Optional functions */
  97         esp->dma_barrier = 0;
  98         esp->dma_drain = 0;
  99         esp->dma_invalidate = 0;
 100         esp->dma_irq_entry = 0;
 101         esp->dma_irq_exit = 0;
 102         esp->dma_poll = 0;
 103         esp->dma_reset = 0;
 104         esp->dma_led_off = &dma_led_off;
 105         esp->dma_led_on = &dma_led_on;
 106
 107         /* virtual DMA functions */
 108         esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
 109         esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
 110         esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one;
 111         esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl;
 112         esp->dma_advance_sg = &dma_advance_sg;
 113
 114
 115         /* SCSI chip speed */
 116         esp->cfreq = 40000000;
 117
 118         /*
 119          * we don't give the address of DMA channel, but the number
 120          * of DMA channel, so we can use the jazz DMA functions
 121          *
 122          */
 123         esp->dregs = JAZZ_SCSI_DMA;
 124
 125         /* ESP register base */
 126         esp->eregs = (struct ESP_regs *)(JAZZ_SCSI_BASE);
 127
 128         /* Set the command buffer */
 129         esp->esp_command = (volatile unsigned char *)cmd_buffer;
 130
 131         /* get virtual dma address for command buffer */
 132         esp->esp_command_dvma = vdma_alloc(CPHYSADDR(cmd_buffer), sizeof (cmd_buffer));
 133
 134         esp->irq = JAZZ_SCSI_IRQ;
 135         request_irq(JAZZ_SCSI_IRQ, esp_intr, SA_INTERRUPT, "JAZZ SCSI",
 136                     esp->ehost);
 137
 138         /*
 139          * FIXME, look if the scsi id is available from NVRAM
 140          */
 141         esp->scsi_id = 7;
 142
 143         /* Check for differential SCSI-bus */
 144         /* What is this stuff? */
 145         esp->diff = 0;
 146
 147         esp_initialize(esp);
 148
 149         printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps,esps_in_use);
 150         esps_running = esps_in_use;
 151         return esps_in_use;
 152     }
 153     return 0;
 154 }
 155
 156 /************************************************************* DMA Functions */
 157 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
 158 {
 159     return fifo_count;
 160 }
 161
 162 static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd *sp)
 163 {
 164     /*
 165      * maximum DMA size is 1MB
 166      */
 167     unsigned long sz = sp->SCp.this_residual;
 168     if(sz > 0x100000)
 169         sz = 0x100000;
 170     return sz;
 171 }
 172
 173 static void dma_dump_state(struct NCR_ESP *esp)
 174 {
 175
 176     ESPLOG(("esp%d: dma -- enable <%08x> residue <%08x\n",
 177             esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_residue((int)esp->dregs)));
 178 }
 179
 180 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
 181 {
 182     dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
 183     vdma_disable ((int)esp->dregs);
 184     vdma_set_mode ((int)esp->dregs, DMA_MODE_READ);
 185     vdma_set_addr ((int)esp->dregs, vaddress);
 186     vdma_set_count ((int)esp->dregs, length);
 187     vdma_enable ((int)esp->dregs);
 188 }
 189
 190 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
 191 {
 192     dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
 193     vdma_disable ((int)esp->dregs);
 194     vdma_set_mode ((int)esp->dregs, DMA_MODE_WRITE);
 195     vdma_set_addr ((int)esp->dregs, vaddress);
 196     vdma_set_count ((int)esp->dregs, length);
 197     vdma_enable ((int)esp->dregs);
 198 }
 199
 200 static void dma_ints_off(struct NCR_ESP *esp)
 201 {
 202     disable_irq(esp->irq);
 203 }
 204
 205 static void dma_ints_on(struct NCR_ESP *esp)
 206 {
 207     enable_irq(esp->irq);
 208 }
 209
 210 static int dma_irq_p(struct NCR_ESP *esp)
 211 {
 212     return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
 213 }
 214
 215 static int dma_ports_p(struct NCR_ESP *esp)
 216 {
 217     int enable = vdma_get_enable((int)esp->dregs);
 218
 219     return (enable & R4030_CHNL_ENABLE);
 220 }
 221
 222 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
 223 {
 224     /*
 225      * On the Sparc, DMA_ST_WRITE means "move data from device to memory"
 226      * so when (write) is true, it actually means READ!
 227      */
 228     if(write){
 229         dma_init_read(esp, addr, count);
 230     } else {
 231         dma_init_write(esp, addr, count);
 232     }
 233 }
 234
 235 static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
 236 {
 237     sp->SCp.have_data_in = vdma_alloc(CPHYSADDR(sp->SCp.buffer), sp->SCp.this_residual);
 238     sp->SCp.ptr = (char *)((unsigned long)sp->SCp.have_data_in);
 239 }
 240
 241 static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
 242 {
 243     int sz = sp->SCp.buffers_residual;
 244     struct scatterlist *sg = (struct scatterlist *) sp->SCp.buffer;
 245
 246     while (sz >= 0) {
 247         sg[sz].dma_address = vdma_alloc(CPHYSADDR(page_address(sg[sz].page) + sg[sz].offset), sg[sz].length);
 248         sz--;
 249     }
 250     sp->SCp.ptr=(char *)(sp->SCp.buffer->dma_address);
 251 }
 252
 253 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
 254 {
 255     vdma_free(sp->SCp.have_data_in);
 256 }
 257
 258 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
 259 {
 260     int sz = sp->use_sg - 1;
 261     struct scatterlist *sg = (struct scatterlist *)sp->buffer;
 262
 263     while(sz >= 0) {
 264         vdma_free(sg[sz].dma_address);
 265         sz--;
 266     }
 267 }
 268
 269 static void dma_advance_sg (struct scsi_cmnd *sp)
 270 {
 271     sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
 272 }
 273
 274 #define JAZZ_HDC_LED   0xe000d100 /* FIXME, find correct address */
 275
 276 static void dma_led_off(struct NCR_ESP *esp)
 277 {
 278 #if 0
 279     *(unsigned char *)JAZZ_HDC_LED = 0;
 280 #endif
 281 }
 282
 283 static void dma_led_on(struct NCR_ESP *esp)
 284 {
 285 #if 0
 286     *(unsigned char *)JAZZ_HDC_LED = 1;
 287 #endif
 288 }
 289
 290 static struct scsi_host_template driver_template = {
 291         .proc_name              = "jazz_esp",
 292         .proc_info              = esp_proc_info,
 293         .name                   = "ESP 100/100a/200",
 294         .detect                 = jazz_esp_detect,
 295         .slave_alloc            = esp_slave_alloc,
 296         .slave_destroy          = esp_slave_destroy,
 297         .release                = jazz_esp_release,
 298         .info                   = esp_info,
 299         .queuecommand           = esp_queue,
 300         .eh_abort_handler       = esp_abort,
 301         .eh_bus_reset_handler   = esp_reset,
 302         .can_queue              = 7,
 303         .this_id                = 7,
 304         .sg_tablesize           = SG_ALL,
 305         .cmd_per_lun            = 1,
 306         .use_clustering         = DISABLE_CLUSTERING,
 307 };
 308 #include "scsi_module.c"