drivers/scsi/cyberstormII.c

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 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 intdma_bytes_sent(struct NCR_ESP *esp,int fifo_count);
 40 static intdma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
 41 static voiddma_dump_state(struct NCR_ESP *esp);
 42 static voiddma_init_read(struct NCR_ESP *esp, __u32 addr,int length);
 43 static voiddma_init_write(struct NCR_ESP *esp, __u32 addr,int length);
 44 static voiddma_ints_off(struct NCR_ESP *esp);
 45 static voiddma_ints_on(struct NCR_ESP *esp);
 46 static intdma_irq_p(struct NCR_ESP *esp);
 47 static voiddma_led_off(struct NCR_ESP *esp);
 48 static voiddma_led_on(struct NCR_ESP *esp);
 49 static intdma_ports_p(struct NCR_ESP *esp);
 50 static voiddma_setup(struct NCR_ESP *esp, __u32 addr,int count,int write);
 51
 52 volatileunsigned 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 return0;/* 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 = (volatileunsigned 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 return0;
 148 }
 149
 150 /************************************************************* DMA Functions */
 151 static intdma_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 intdma_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 voiddma_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 voiddma_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 voiddma_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 voiddma_ints_off(struct NCR_ESP *esp)
 210 {
 211 disable_irq(esp->irq);
 212 }
 213
 214 static voiddma_ints_on(struct NCR_ESP *esp)
 215 {
 216 enable_irq(esp->irq);
 217 }
 218
 219 static intdma_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 voiddma_led_off(struct NCR_ESP *esp)
 226 {
 227 ((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg &= ~CYBERII_DMA_LED;
 228 }
 229
 230 static voiddma_led_on(struct NCR_ESP *esp)
 231 {
 232 ((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg |= CYBERII_DMA_LED;
 233 }
 234
 235 static intdma_ports_p(struct NCR_ESP *esp)
 236 {
 237 return((custom.intenar) & IF_PORTS);
 238 }
 239
 240 static voiddma_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 intcyberII_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 return1;
 276 }