drivers/scsi/cyberstormII.c

   1 /* cyberstormII.c: Driver for CyberStorm SCSI Mk II
   2  *
   3  * Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk)
   4  *
   5  * This driver is based on cyberstorm.c
   6  */
   7
   8 /* TODO:
   9  *
  10  * 1) Figure out how to make a cleaner merge with the sparc driver with regard
  11  *    to the caches and the Sparc MMU mapping.
  12  * 2) Make as few routines required outside the generic driver. A lot of the
  13  *    routines in this file used to be inline!
  14  */
  15
  16 #include <linux/module.h>
  17
  18 #include <linux/init.h>
  19 #include <linux/kernel.h>
  20 #include <linux/delay.h>
  21 #include <linux/types.h>
  22 #include <linux/string.h>
  23 #include <linux/malloc.h>
  24 #include <linux/blk.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/stat.h>
  27
  28 #include "scsi.h"
  29 #include "hosts.h"
  30 #include "NCR53C9x.h"
  31 #include "cyberstormII.h"
  32
  33 #include <linux/zorro.h>
  34 #include <asm/irq.h>
  35 #include <asm/amigaints.h>
  36 #include <asm/amigahw.h>
  37
  38 #include <asm/pgtable.h>
  39
  40 static int  dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
  41 static int  dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
  42 static void dma_dump_state(struct NCR_ESP *esp);
  43 static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length);
  44 static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length);
  45 static void dma_ints_off(struct NCR_ESP *esp);
  46 static void dma_ints_on(struct NCR_ESP *esp);
  47 static int  dma_irq_p(struct NCR_ESP *esp);
  48 static void dma_led_off(struct NCR_ESP *esp);
  49 static void dma_led_on(struct NCR_ESP *esp);
  50 static int  dma_ports_p(struct NCR_ESP *esp);
  51 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
  52
  53 volatile unsigned char cmd_buffer[16];
  54                                 /* This is where all commands are put
  55                                  * before they are transfered to the ESP chip
  56                                  * via PIO.
  57                                  */
  58
  59 /***************************************************************** Detection */
  60 int __init cyberII_esp_detect(Scsi_Host_Template *tpnt)
  61 {
  62         struct NCR_ESP *esp;
  63         struct zorro_dev *z = NULL;
  64         unsigned long address;
  65         struct ESP_regs *eregs;
  66
  67         if ((z = zorro_find_device(ZORRO_PROD_PHASE5_CYBERSTORM_MK_II, z))) {
  68             unsigned long board = z->resource.start;
  69             if (request_mem_region(board+CYBERII_ESP_ADDR,
  70                                    sizeof(struct ESP_regs), "NCR53C9x")) {
  71                 /* Do some magic to figure out if the CyberStorm Mk II
  72                  * is equipped with a SCSI controller
  73                  */
  74                 address = (unsigned long)ZTWO_VADDR(board);
  75                 eregs = (struct ESP_regs *)(address + CYBERII_ESP_ADDR);
  76
  77                 esp = esp_allocate(tpnt, (void *)board+CYBERII_ESP_ADDR);
  78
  79                 esp_write(eregs->esp_cfg1, (ESP_CONFIG1_PENABLE | 7));
  80                 udelay(5);
  81                 if(esp_read(eregs->esp_cfg1) != (ESP_CONFIG1_PENABLE | 7)) {
  82                         esp_deallocate(esp);
  83                         scsi_unregister(esp->ehost);
  84                         release_mem_region(board+CYBERII_ESP_ADDR,
  85                                            sizeof(struct ESP_regs));
  86                         return 0; /* Bail out if address did not hold data */
  87                 }
  88
  89                 /* Do command transfer with programmed I/O */
  90                 esp->do_pio_cmds = 1;
  91
  92                 /* Required functions */
  93                 esp->dma_bytes_sent = &dma_bytes_sent;
  94                 esp->dma_can_transfer = &dma_can_transfer;
  95                 esp->dma_dump_state = &dma_dump_state;
  96                 esp->dma_init_read = &dma_init_read;
  97                 esp->dma_init_write = &dma_init_write;
  98                 esp->dma_ints_off = &dma_ints_off;
  99                 esp->dma_ints_on = &dma_ints_on;
 100                 esp->dma_irq_p = &dma_irq_p;
 101                 esp->dma_ports_p = &dma_ports_p;
 102                 esp->dma_setup = &dma_setup;
 103
 104                 /* Optional functions */
 105                 esp->dma_barrier = 0;
 106                 esp->dma_drain = 0;
 107                 esp->dma_invalidate = 0;
 108                 esp->dma_irq_entry = 0;
 109                 esp->dma_irq_exit = 0;
 110                 esp->dma_led_on = &dma_led_on;
 111                 esp->dma_led_off = &dma_led_off;
 112                 esp->dma_poll = 0;
 113                 esp->dma_reset = 0;
 114
 115                 /* SCSI chip speed */
 116                 esp->cfreq = 40000000;
 117
 118                 /* The DMA registers on the CyberStorm are mapped
 119                  * relative to the device (i.e. in the same Zorro
 120                  * I/O block).
 121                  */
 122                 esp->dregs = (void *)(address + CYBERII_DMA_ADDR);
 123
 124                 /* ESP register base */
 125                 esp->eregs = eregs;
 126
 127                 /* Set the command buffer */
 128                 esp->esp_command = (volatile unsigned char*) cmd_buffer;
 129                 esp->esp_command_dvma = virt_to_bus(cmd_buffer);
 130
 131                 esp->irq = IRQ_AMIGA_PORTS;
 132                 request_irq(IRQ_AMIGA_PORTS, esp_intr, SA_SHIRQ,
 133                             "CyberStorm SCSI Mk II", esp_intr);
 134
 135                 /* Figure out our scsi ID on the bus */
 136                 esp->scsi_id = 7;
 137
 138                 /* We don't have a differential SCSI-bus. */
 139                 esp->diff = 0;
 140
 141                 esp_initialize(esp);
 142
 143                 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps, esps_in_use);
 144                 esps_running = esps_in_use;
 145                 return esps_in_use;
 146             }
 147         }
 148         return 0;
 149 }
 150
 151 /************************************************************* DMA Functions */
 152 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
 153 {
 154         /* Since the CyberStorm DMA is fully dedicated to the ESP chip,
 155          * the number of bytes sent (to the ESP chip) equals the number
 156          * of bytes in the FIFO - there is no buffering in the DMA controller.
 157          * XXXX Do I read this right? It is from host to ESP, right?
 158          */
 159         return fifo_count;
 160 }
 161
 162 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
 163 {
 164         /* I don't think there's any limit on the CyberDMA. So we use what
 165          * the ESP chip can handle (24 bit).
 166          */
 167         unsigned long sz = sp->SCp.this_residual;
 168         if(sz > 0x1000000)
 169                 sz = 0x1000000;
 170         return sz;
 171 }
 172
 173 static void dma_dump_state(struct NCR_ESP *esp)
 174 {
 175         ESPLOG(("esp%d: dma -- cond_reg<%02x>\n",
 176                 esp->esp_id, ((struct cyberII_dma_registers *)
 177                               (esp->dregs))->cond_reg));
 178         ESPLOG(("intreq:<%04x>, intena:<%04x>\n",
 179                 custom.intreqr, custom.intenar));
 180 }
 181
 182 static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length)
 183 {
 184         struct cyberII_dma_registers *dregs =
 185                 (struct cyberII_dma_registers *) esp->dregs;
 186
 187         cache_clear(addr, length);
 188
 189         addr &= ~(1);
 190         dregs->dma_addr0 = (addr >> 24) & 0xff;
 191         dregs->dma_addr1 = (addr >> 16) & 0xff;
 192         dregs->dma_addr2 = (addr >>  8) & 0xff;
 193         dregs->dma_addr3 = (addr      ) & 0xff;
 194 }
 195
 196 static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length)
 197 {
 198         struct cyberII_dma_registers *dregs =
 199                 (struct cyberII_dma_registers *) esp->dregs;
 200
 201         cache_push(addr, length);
 202
 203         addr |= 1;
 204         dregs->dma_addr0 = (addr >> 24) & 0xff;
 205         dregs->dma_addr1 = (addr >> 16) & 0xff;
 206         dregs->dma_addr2 = (addr >>  8) & 0xff;
 207         dregs->dma_addr3 = (addr      ) & 0xff;
 208 }
 209
 210 static void dma_ints_off(struct NCR_ESP *esp)
 211 {
 212         disable_irq(esp->irq);
 213 }
 214
 215 static void dma_ints_on(struct NCR_ESP *esp)
 216 {
 217         enable_irq(esp->irq);
 218 }
 219
 220 static int dma_irq_p(struct NCR_ESP *esp)
 221 {
 222         /* It's important to check the DMA IRQ bit in the correct way! */
 223         return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
 224 }
 225
 226 static void dma_led_off(struct NCR_ESP *esp)
 227 {
 228         ((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg &= ~CYBERII_DMA_LED;
 229 }
 230
 231 static void dma_led_on(struct NCR_ESP *esp)
 232 {
 233         ((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg |= CYBERII_DMA_LED;
 234 }
 235
 236 static int dma_ports_p(struct NCR_ESP *esp)
 237 {
 238         return ((custom.intenar) & IF_PORTS);
 239 }
 240
 241 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
 242 {
 243         /* On the Sparc, DMA_ST_WRITE means "move data from device to memory"
 244          * so when (write) is true, it actually means READ!
 245          */
 246         if(write){
 247                 dma_init_read(esp, addr, count);
 248         } else {
 249                 dma_init_write(esp, addr, count);
 250         }
 251 }
 252
 253 #define HOSTS_C
 254
 255 #include "cyberstormII.h"
 256
 257 static Scsi_Host_Template driver_template = SCSI_CYBERSTORMII;
 258
 259 #include "scsi_module.c"
 260
 261
 262 int cyberII_esp_release(struct Scsi_Host *instance)
 263 {
 264 #ifdef MODULE
 265         unsigned long address = (unsigned long)((struct NCR_ESP *)instance->hostdata)->edev;
 266
 267         esp_deallocate((struct NCR_ESP *)instance->hostdata);
 268         esp_release();
 269         release_mem_region(address, sizeof(struct ESP_regs));
 270         free_irq(IRQ_AMIGA_PORTS, esp_intr);
 271 #endif
 272         return 1;
 273 }