i386/linux/linux-2.3.21/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/kernel.h>
  19 #include <linux/delay.h>
  20 #include <linux/types.h>
  21 #include <linux/string.h>
  22 #include <linux/malloc.h>
  23 #include <linux/blk.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/stat.h>
  26
  27 #include "scsi.h"
  28 #include "hosts.h"
  29 #include "NCR53C9x.h"
  30 #include "cyberstormII.h"
  31
  32 #include <linux/zorro.h>
  33 #include <asm/irq.h>
  34 #include <asm/amigaints.h>
  35 #include <asm/amigahw.h>
  36
  37 #include <asm/pgtable.h>
  38
  39 static int  dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
  40 static int  dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
  41 static void dma_dump_state(struct NCR_ESP *esp);
  42 static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length);
  43 static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length);
  44 static void dma_ints_off(struct NCR_ESP *esp);
  45 static void dma_ints_on(struct NCR_ESP *esp);
  46 static int  dma_irq_p(struct NCR_ESP *esp);
  47 static void dma_led_off(struct NCR_ESP *esp);
  48 static void dma_led_on(struct NCR_ESP *esp);
  49 static int  dma_ports_p(struct NCR_ESP *esp);
  50 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
  51
  52 volatile unsigned char cmd_buffer[16];
  53                                 /* This is where all commands are put
  54                                  * before they are transfered to the ESP chip
  55                                  * via PIO.
  56                                  */
  57
  58 /***************************************************************** Detection */
  59 int __init cyberII_esp_detect(Scsi_Host_Template *tpnt)
  60 {
  61         struct NCR_ESP *esp;
  62         const struct ConfigDev *esp_dev;
  63         unsigned int key;
  64         unsigned long address;
  65         struct ESP_regs *eregs;
  66
  67         if((key = zorro_find(ZORRO_PROD_PHASE5_CYBERSTORM_MK_II, 0, 0))){
  68                 esp_dev = zorro_get_board(key);
  69
  70                 /* Do some magic to figure out if the CyberStorm Mk II
  71                  * is equipped with a SCSI controller
  72                  */
  73                 address = (unsigned long)ZTWO_VADDR(esp_dev->cd_BoardAddr);
  74                 eregs = (struct ESP_regs *)(address + CYBERII_ESP_ADDR);
  75
  76                 esp = esp_allocate(tpnt, (void *) esp_dev);
  77
  78                 esp_write(eregs->esp_cfg1, (ESP_CONFIG1_PENABLE | 7));
  79                 udelay(5);
  80                 if(esp_read(eregs->esp_cfg1) != (ESP_CONFIG1_PENABLE | 7)) {
  81                         esp_deallocate(esp);
  82                         scsi_unregister(esp->ehost);
  83                         return 0; /* Bail out if address did not hold data */
  84                 }
  85
  86                 /* Do command transfer with programmed I/O */
  87                 esp->do_pio_cmds = 1;
  88
  89                 /* Required functions */
  90                 esp->dma_bytes_sent = &dma_bytes_sent;
  91                 esp->dma_can_transfer = &dma_can_transfer;
  92                 esp->dma_dump_state = &dma_dump_state;
  93                 esp->dma_init_read = &dma_init_read;
  94                 esp->dma_init_write = &dma_init_write;
  95                 esp->dma_ints_off = &dma_ints_off;
  96                 esp->dma_ints_on = &dma_ints_on;
  97                 esp->dma_irq_p = &dma_irq_p;
  98                 esp->dma_ports_p = &dma_ports_p;
  99                 esp->dma_setup = &dma_setup;
 100
 101                 /* Optional functions */
 102                 esp->dma_barrier = 0;
 103                 esp->dma_drain = 0;
 104                 esp->dma_invalidate = 0;
 105                 esp->dma_irq_entry = 0;
 106                 esp->dma_irq_exit = 0;
 107                 esp->dma_led_on = &dma_led_on;
 108                 esp->dma_led_off = &dma_led_off;
 109                 esp->dma_poll = 0;
 110                 esp->dma_reset = 0;
 111
 112                 /* SCSI chip speed */
 113                 esp->cfreq = 40000000;
 114
 115                 /* The DMA registers on the CyberStorm are mapped
 116                  * relative to the device (i.e. in the same Zorro
 117                  * I/O block).
 118                  */
 119                 esp->dregs = (void *)(address + CYBERII_DMA_ADDR);
 120
 121                 /* ESP register base */
 122                 esp->eregs = eregs;
 123
 124                 /* Set the command buffer */
 125                 esp->esp_command = (volatile unsigned char*) cmd_buffer;
 126                 esp->esp_command_dvma = virt_to_bus(cmd_buffer);
 127
 128                 esp->irq = IRQ_AMIGA_PORTS;
 129                 esp->slot = key;
 130                 request_irq(IRQ_AMIGA_PORTS, esp_intr, SA_SHIRQ,
 131                             "CyberStorm SCSI Mk II", esp_intr);
 132
 133                 /* Figure out our scsi ID on the bus */
 134                 esp->scsi_id = 7;
 135
 136                 /* We don't have a differential SCSI-bus. */
 137                 esp->diff = 0;
 138
 139                 esp_initialize(esp);
 140
 141                 zorro_config_board(key, 0);
 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         return 0;
 148 }
 149
 150 /************************************************************* DMA Functions */
 151 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
 152 {
 153         /* Since the CyberStorm DMA is fully dedicated to the ESP chip,
 154          * the number of bytes sent (to the ESP chip) equals the number
 155          * of bytes in the FIFO - there is no buffering in the DMA controller.
 156          * XXXX Do I read this right? It is from host to ESP, right?
 157          */
 158         return fifo_count;
 159 }
 160
 161 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
 162 {
 163         /* I don't think there's any limit on the CyberDMA. So we use what
 164          * the ESP chip can handle (24 bit).
 165          */
 166         unsigned long sz = sp->SCp.this_residual;
 167         if(sz > 0x1000000)
 168                 sz = 0x1000000;
 169         return sz;
 170 }
 171
 172 static void dma_dump_state(struct NCR_ESP *esp)
 173 {
 174         ESPLOG(("esp%d: dma -- cond_reg<%02x>\n",
 175                 esp->esp_id, ((struct cyberII_dma_registers *)
 176                               (esp->dregs))->cond_reg));
 177         ESPLOG(("intreq:<%04x>, intena:<%04x>\n",
 178                 custom.intreqr, custom.intenar));
 179 }
 180
 181 static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length)
 182 {
 183         struct cyberII_dma_registers *dregs =
 184                 (struct cyberII_dma_registers *) esp->dregs;
 185
 186         cache_clear(addr, length);
 187
 188         addr &= ~(1);
 189         dregs->dma_addr0 = (addr >> 24) & 0xff;
 190         dregs->dma_addr1 = (addr >> 16) & 0xff;
 191         dregs->dma_addr2 = (addr >>  8) & 0xff;
 192         dregs->dma_addr3 = (addr      ) & 0xff;
 193 }
 194
 195 static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length)
 196 {
 197         struct cyberII_dma_registers *dregs =
 198                 (struct cyberII_dma_registers *) esp->dregs;
 199
 200         cache_push(addr, length);
 201
 202         addr |= 1;
 203         dregs->dma_addr0 = (addr >> 24) & 0xff;
 204         dregs->dma_addr1 = (addr >> 16) & 0xff;
 205         dregs->dma_addr2 = (addr >>  8) & 0xff;
 206         dregs->dma_addr3 = (addr      ) & 0xff;
 207 }
 208
 209 static void dma_ints_off(struct NCR_ESP *esp)
 210 {
 211         disable_irq(esp->irq);
 212 }
 213
 214 static void dma_ints_on(struct NCR_ESP *esp)
 215 {
 216         enable_irq(esp->irq);
 217 }
 218
 219 static int dma_irq_p(struct NCR_ESP *esp)
 220 {
 221         /* It's important to check the DMA IRQ bit in the correct way! */
 222         return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
 223 }
 224
 225 static void dma_led_off(struct NCR_ESP *esp)
 226 {
 227         ((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg &= ~CYBERII_DMA_LED;
 228 }
 229
 230 static void dma_led_on(struct NCR_ESP *esp)
 231 {
 232         ((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg |= CYBERII_DMA_LED;
 233 }
 234
 235 static int dma_ports_p(struct NCR_ESP *esp)
 236 {
 237         return ((custom.intenar) & IF_PORTS);
 238 }
 239
 240 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
 241 {
 242         /* On the Sparc, DMA_ST_WRITE means "move data from device to memory"
 243          * so when (write) is true, it actually means READ!
 244          */
 245         if(write){
 246                 dma_init_read(esp, addr, count);
 247         } else {
 248                 dma_init_write(esp, addr, count);
 249         }
 250 }
 251
 252 #ifdef MODULE
 253
 254 #define HOSTS_C
 255
 256 #include "cyberstormII.h"
 257
 258 Scsi_Host_Template driver_template = SCSI_CYBERSTORMII;
 259
 260 #include "scsi_module.c"
 261
 262 #endif
 263
 264 int cyberII_esp_release(struct Scsi_Host *instance)
 265 {
 266 #ifdef MODULE
 267         unsigned int key;
 268
 269         key = ((struct NCR_ESP *)instance->hostdata)->slot;
 270         esp_deallocate((struct NCR_ESP *)instance->hostdata);
 271         esp_release();
 272         zorro_unconfig_board(key, 0);
 273         free_irq(IRQ_AMIGA_PORTS, esp_intr);
 274 #endif
 275         return 1;
 276 }