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