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/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 intdma_bytes_sent(struct NCR_ESP *esp,int fifo_count);
 41 static intdma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
 42 static voiddma_dump_state(struct NCR_ESP *esp);
 43 static voiddma_init_read(struct NCR_ESP *esp, __u32 addr,int length);
 44 static voiddma_init_write(struct NCR_ESP *esp, __u32 addr,int length);
 45 static voiddma_ints_off(struct NCR_ESP *esp);
 46 static voiddma_ints_on(struct NCR_ESP *esp);
 47 static intdma_irq_p(struct NCR_ESP *esp);
 48 static voiddma_led_off(struct NCR_ESP *esp);
 49 static voiddma_led_on(struct NCR_ESP *esp);
 50 static intdma_ports_p(struct NCR_ESP *esp);
 51 static voiddma_setup(struct NCR_ESP *esp, __u32 addr,int count,int write);
 52
 53 volatileunsigned 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 return0;/* 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 = (volatileunsigned 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 return0;
 149 }
 150
 151 /************************************************************* DMA Functions */
 152 static intdma_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 intdma_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 voiddma_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 voiddma_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 voiddma_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 voiddma_ints_off(struct NCR_ESP *esp)
 211 {
 212 disable_irq(esp->irq);
 213 }
 214
 215 static voiddma_ints_on(struct NCR_ESP *esp)
 216 {
 217 enable_irq(esp->irq);
 218 }
 219
 220 static intdma_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 voiddma_led_off(struct NCR_ESP *esp)
 227 {
 228 ((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg &= ~CYBERII_DMA_LED;
 229 }
 230
 231 static voiddma_led_on(struct NCR_ESP *esp)
 232 {
 233 ((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg |= CYBERII_DMA_LED;
 234 }
 235
 236 static intdma_ports_p(struct NCR_ESP *esp)
 237 {
 238 return((custom.intenar) & IF_PORTS);
 239 }
 240
 241 static voiddma_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 intcyberII_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 return1;
 273 }