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 Boegndoerfer (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/kernel.h>
  10 #include <linux/delay.h>
  11 #include <linux/types.h>
  12 #include <linux/string.h>
  13 #include <linux/malloc.h>
  14 #include <linux/blk.h>
  15 #include <linux/proc_fs.h>
  16 #include <linux/stat.h>
  17
  18 #include "scsi.h"
  19 #include "hosts.h"
  20 #include "NCR53C9x.h"
  21 #include "jazz_esp.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, 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, Scsi_Cmnd *sp);
  41 static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp);
  42 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp);
  43 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp);
  44 static void dma_advance_sg (Scsi_Cmnd *sp);
  45 static void dma_led_off(struct NCR_ESP *);
  46 static void dma_led_on(struct NCR_ESP *);
  47
  48
  49 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 /***************************************************************** Detection */
  56 int jazz_esp_detect(Scsi_Host_Template *tpnt)
  57 {
  58     struct NCR_ESP *esp;
  59     struct ConfigDev *esp_dev;
  60
  61     /*
  62      * first assumption it is there:-)
  63      */
  64     if (1) {
  65         esp_dev = 0;
  66         esp = esp_allocate(tpnt, (void *) esp_dev);
  67
  68         /* Do command transfer with programmed I/O */
  69         esp->do_pio_cmds = 1;
  70
  71         /* Required functions */
  72         esp->dma_bytes_sent = &dma_bytes_sent;
  73         esp->dma_can_transfer = &dma_can_transfer;
  74         esp->dma_dump_state = &dma_dump_state;
  75         esp->dma_init_read = &dma_init_read;
  76         esp->dma_init_write = &dma_init_write;
  77         esp->dma_ints_off = &dma_ints_off;
  78         esp->dma_ints_on = &dma_ints_on;
  79         esp->dma_irq_p = &dma_irq_p;
  80         esp->dma_ports_p = &dma_ports_p;
  81         esp->dma_setup = &dma_setup;
  82
  83         /* Optional functions */
  84         esp->dma_barrier = 0;
  85         esp->dma_drain = 0;
  86         esp->dma_invalidate = 0;
  87         esp->dma_irq_entry = 0;
  88         esp->dma_irq_exit = 0;
  89         esp->dma_poll = 0;
  90         esp->dma_reset = 0;
  91         esp->dma_led_off = &dma_led_off;
  92         esp->dma_led_on = &dma_led_on;
  93
  94         /* virtual DMA functions */
  95         esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
  96         esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
  97         esp->dma_mmu_release_scsi_one = &dma_mmu_release_scsi_one;
  98         esp->dma_mmu_release_scsi_sgl = &dma_mmu_release_scsi_sgl;
  99         esp->dma_advance_sg = &dma_advance_sg;
 100
 101
 102         /* SCSI chip speed */
 103         esp->cfreq = 40000000;
 104
 105         /*
 106          * we don't give the address of DMA channel, but the number
 107          * of DMA channel, so we can use the jazz DMA functions
 108          *
 109          */
 110         esp->dregs = JAZZ_SCSI_DMA;
 111
 112         /* ESP register base */
 113         esp->eregs = (struct ESP_regs *)(JAZZ_SCSI_BASE);
 114
 115         /* Set the command buffer */
 116         esp->esp_command = (volatile unsigned char *)cmd_buffer;
 117
 118         /* get virtual dma address for command buffer */
 119         esp->esp_command_dvma = vdma_alloc(PHYSADDR(cmd_buffer), sizeof (cmd_buffer));
 120
 121         esp->irq = JAZZ_SCSI_IRQ;
 122         request_irq(JAZZ_SCSI_IRQ, esp_intr, SA_INTERRUPT, "JAZZ SCSI",
 123                     NULL);
 124
 125         /*
 126          * FIXME, look if the scsi id is availabe from NVRAM
 127          */
 128         esp->scsi_id = 7;
 129
 130         /* Check for differential SCSI-bus */
 131         /* What is this stuff? */
 132         esp->diff = 0;
 133
 134         esp_initialize(esp);
 135
 136         printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps,esps_in_use);
 137         esps_running = esps_in_use;
 138         return esps_in_use;
 139     }
 140     return 0;
 141 }
 142
 143 /************************************************************* DMA Functions */
 144 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
 145 {
 146     return fifo_count;
 147 }
 148
 149 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
 150 {
 151     /*
 152      * maximum DMA size is 1MB
 153      */
 154     unsigned long sz = sp->SCp.this_residual;
 155     if(sz > 0x100000)
 156         sz = 0x100000;
 157     return sz;
 158 }
 159
 160 static void dma_dump_state(struct NCR_ESP *esp)
 161 {
 162
 163     ESPLOG(("esp%d: dma -- enable <%08x> residue <%08x\n",
 164             esp->esp_id, vdma_get_enable((int)esp->dregs), vdma_get_resdiue((int)esp->dregs)));
 165 }
 166
 167 static void dma_init_read(struct NCR_ESP *esp, __u32 vaddress, int length)
 168 {
 169     dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
 170     vdma_disable ((int)esp->dregs);
 171     vdma_set_mode ((int)esp->dregs, DMA_MODE_READ);
 172     vdma_set_addr ((int)esp->dregs, vaddress);
 173     vdma_set_count ((int)esp->dregs, length);
 174     vdma_enable ((int)esp->dregs);
 175 }
 176
 177 static void dma_init_write(struct NCR_ESP *esp, __u32 vaddress, int length)
 178 {
 179     dma_cache_wback_inv ((unsigned long)phys_to_virt(vdma_log2phys(vaddress)), length);
 180     vdma_disable ((int)esp->dregs);
 181     vdma_set_mode ((int)esp->dregs, DMA_MODE_WRITE);
 182     vdma_set_addr ((int)esp->dregs, vaddress);
 183     vdma_set_count ((int)esp->dregs, length);
 184     vdma_enable ((int)esp->dregs);
 185 }
 186
 187 static void dma_ints_off(struct NCR_ESP *esp)
 188 {
 189     disable_irq(esp->irq);
 190 }
 191
 192 static void dma_ints_on(struct NCR_ESP *esp)
 193 {
 194     enable_irq(esp->irq);
 195 }
 196
 197 static int dma_irq_p(struct NCR_ESP *esp)
 198 {
 199     return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
 200 }
 201
 202 static int dma_ports_p(struct NCR_ESP *esp)
 203 {
 204     int enable = vdma_get_enable((int)esp->dregs);
 205
 206     return (enable & R4030_CHNL_ENABLE);
 207 }
 208
 209 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
 210 {
 211     /*
 212      * On the Sparc, DMA_ST_WRITE means "move data from device to memory"
 213      * so when (write) is true, it actually means READ!
 214      */
 215     if(write){
 216         dma_init_read(esp, addr, count);
 217     } else {
 218         dma_init_write(esp, addr, count);
 219     }
 220 }
 221
 222 static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp)
 223 {
 224     sp->SCp.have_data_in = vdma_alloc(PHYSADDR(sp->SCp.buffer), sp->SCp.this_residual);
 225     sp->SCp.ptr = (char *)((unsigned long)sp->SCp.have_data_in);
 226 }
 227
 228 static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp)
 229 {
 230     int sz = sp->SCp.buffers_residual;
 231     struct mmu_sglist *sg = (struct mmu_sglist *) sp->SCp.buffer;
 232
 233     while (sz >= 0) {
 234         sg[sz].dvma_addr = vdma_alloc(PHYSADDR(sg[sz].addr), sg[sz].len);
 235         sz--;
 236     }
 237     sp->SCp.ptr=(char *)((unsigned long)sp->SCp.buffer->dvma_address);
 238 }
 239
 240 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp)
 241 {
 242     vdma_free(sp->SCp.have_data_in);
 243 }
 244
 245 static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp)
 246 {
 247     int sz = sp->use_sg - 1;
 248     struct mmu_sglist *sg = (struct mmu_sglist *)sp->buffer;
 249
 250     while(sz >= 0) {
 251         vdma_free(sg[sz].dvma_addr);
 252         sz--;
 253     }
 254 }
 255
 256 static void dma_advance_sg (Scsi_Cmnd *sp)
 257 {
 258     sp->SCp.ptr = (char *)((unsigned long)sp->SCp.buffer->dvma_address);
 259 }
 260
 261 #define JAZZ_HDC_LED   0xe000d100 /* FIXME, find correct address */
 262
 263 static void dma_led_off(struct NCR_ESP *esp)
 264 {
 265 #if 0
 266     *(unsigned char *)JAZZ_HDC_LED = 0;
 267 #endif
 268 }
 269
 270 static void dma_led_on(struct NCR_ESP *esp)
 271 {
 272 #if 0
 273     *(unsigned char *)JAZZ_HDC_LED = 1;
 274 #endif
 275 }