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/slab.h>
  24 #include <linux/blkdev.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/stat.h>
  27 #include <linux/interrupt.h>
  28
  29 #include "scsi.h"
  30 #include <scsi/scsi_host.h>
  31 #include "NCR53C9x.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 /* The controller registers can be found in the Z2 config area at these
  41  * offsets:
  42  */
  43 #define CYBERII_ESP_ADDR 0x1ff03
  44 #define CYBERII_DMA_ADDR 0x1ff43
  45
  46
  47 /* The CyberStorm II DMA interface */
  48 struct cyberII_dma_registers {
  49         volatile unsigned char cond_reg;        /* DMA cond    (ro)  [0x000] */
  50 #define ctrl_reg  cond_reg                      /* DMA control (wo)  [0x000] */
  51         unsigned char dmapad4[0x3f];
  52         volatile unsigned char dma_addr0;       /* DMA address (MSB) [0x040] */
  53         unsigned char dmapad1[3];
  54         volatile unsigned char dma_addr1;       /* DMA address       [0x044] */
  55         unsigned char dmapad2[3];
  56         volatile unsigned char dma_addr2;       /* DMA address       [0x048] */
  57         unsigned char dmapad3[3];
  58         volatile unsigned char dma_addr3;       /* DMA address (LSB) [0x04c] */
  59 };
  60
  61 /* DMA control bits */
  62 #define CYBERII_DMA_LED    0x02 /* HD led control 1 = on */
  63
  64 static int  dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
  65 static int  dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
  66 static void dma_dump_state(struct NCR_ESP *esp);
  67 static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length);
  68 static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length);
  69 static void dma_ints_off(struct NCR_ESP *esp);
  70 static void dma_ints_on(struct NCR_ESP *esp);
  71 static int  dma_irq_p(struct NCR_ESP *esp);
  72 static void dma_led_off(struct NCR_ESP *esp);
  73 static void dma_led_on(struct NCR_ESP *esp);
  74 static int  dma_ports_p(struct NCR_ESP *esp);
  75 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);
  76
  77 static volatile unsigned char cmd_buffer[16];
  78                                 /* This is where all commands are put
  79                                  * before they are transferred to the ESP chip
  80                                  * via PIO.
  81                                  */
  82
  83 /***************************************************************** Detection */
  84 int __init cyberII_esp_detect(struct scsi_host_template *tpnt)
  85 {
  86         struct NCR_ESP *esp;
  87         struct zorro_dev *z = NULL;
  88         unsigned long address;
  89         struct ESP_regs *eregs;
  90
  91         if ((z = zorro_find_device(ZORRO_PROD_PHASE5_CYBERSTORM_MK_II, z))) {
  92             unsigned long board = z->resource.start;
  93             if (request_mem_region(board+CYBERII_ESP_ADDR,
  94                                    sizeof(struct ESP_regs), "NCR53C9x")) {
  95                 /* Do some magic to figure out if the CyberStorm Mk II
  96                  * is equipped with a SCSI controller
  97                  */
  98                 address = (unsigned long)ZTWO_VADDR(board);
  99                 eregs = (struct ESP_regs *)(address + CYBERII_ESP_ADDR);
 100
 101                 esp = esp_allocate(tpnt, (void *)board+CYBERII_ESP_ADDR);
 102
 103                 esp_write(eregs->esp_cfg1, (ESP_CONFIG1_PENABLE | 7));
 104                 udelay(5);
 105                 if(esp_read(eregs->esp_cfg1) != (ESP_CONFIG1_PENABLE | 7)) {
 106                         esp_deallocate(esp);
 107                         scsi_unregister(esp->ehost);
 108                         release_mem_region(board+CYBERII_ESP_ADDR,
 109                                            sizeof(struct ESP_regs));
 110                         return 0; /* Bail out if address did not hold data */
 111                 }
 112
 113                 /* Do command transfer with programmed I/O */
 114                 esp->do_pio_cmds = 1;
 115
 116                 /* Required functions */
 117                 esp->dma_bytes_sent = &dma_bytes_sent;
 118                 esp->dma_can_transfer = &dma_can_transfer;
 119                 esp->dma_dump_state = &dma_dump_state;
 120                 esp->dma_init_read = &dma_init_read;
 121                 esp->dma_init_write = &dma_init_write;
 122                 esp->dma_ints_off = &dma_ints_off;
 123                 esp->dma_ints_on = &dma_ints_on;
 124                 esp->dma_irq_p = &dma_irq_p;
 125                 esp->dma_ports_p = &dma_ports_p;
 126                 esp->dma_setup = &dma_setup;
 127
 128                 /* Optional functions */
 129                 esp->dma_barrier = 0;
 130                 esp->dma_drain = 0;
 131                 esp->dma_invalidate = 0;
 132                 esp->dma_irq_entry = 0;
 133                 esp->dma_irq_exit = 0;
 134                 esp->dma_led_on = &dma_led_on;
 135                 esp->dma_led_off = &dma_led_off;
 136                 esp->dma_poll = 0;
 137                 esp->dma_reset = 0;
 138
 139                 /* SCSI chip speed */
 140                 esp->cfreq = 40000000;
 141
 142                 /* The DMA registers on the CyberStorm are mapped
 143                  * relative to the device (i.e. in the same Zorro
 144                  * I/O block).
 145                  */
 146                 esp->dregs = (void *)(address + CYBERII_DMA_ADDR);
 147
 148                 /* ESP register base */
 149                 esp->eregs = eregs;
 150
 151                 /* Set the command buffer */
 152                 esp->esp_command = cmd_buffer;
 153                 esp->esp_command_dvma = virt_to_bus((void *)cmd_buffer);
 154
 155                 esp->irq = IRQ_AMIGA_PORTS;
 156                 request_irq(IRQ_AMIGA_PORTS, esp_intr, IRQF_SHARED,
 157                             "CyberStorm SCSI Mk II", esp->ehost);
 158
 159                 /* Figure out our scsi ID on the bus */
 160                 esp->scsi_id = 7;
 161
 162                 /* We don't have a differential SCSI-bus. */
 163                 esp->diff = 0;
 164
 165                 esp_initialize(esp);
 166
 167                 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps, esps_in_use);
 168                 esps_running = esps_in_use;
 169                 return esps_in_use;
 170             }
 171         }
 172         return 0;
 173 }
 174
 175 /************************************************************* DMA Functions */
 176 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
 177 {
 178         /* Since the CyberStorm DMA is fully dedicated to the ESP chip,
 179          * the number of bytes sent (to the ESP chip) equals the number
 180          * of bytes in the FIFO - there is no buffering in the DMA controller.
 181          * XXXX Do I read this right? It is from host to ESP, right?
 182          */
 183         return fifo_count;
 184 }
 185
 186 static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
 187 {
 188         /* I don't think there's any limit on the CyberDMA. So we use what
 189          * the ESP chip can handle (24 bit).
 190          */
 191         unsigned long sz = sp->SCp.this_residual;
 192         if(sz > 0x1000000)
 193                 sz = 0x1000000;
 194         return sz;
 195 }
 196
 197 static void dma_dump_state(struct NCR_ESP *esp)
 198 {
 199         ESPLOG(("esp%d: dma -- cond_reg<%02x>\n",
 200                 esp->esp_id, ((struct cyberII_dma_registers *)
 201                               (esp->dregs))->cond_reg));
 202         ESPLOG(("intreq:<%04x>, intena:<%04x>\n",
 203                 amiga_custom.intreqr, amiga_custom.intenar));
 204 }
 205
 206 static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length)
 207 {
 208         struct cyberII_dma_registers *dregs =
 209                 (struct cyberII_dma_registers *) esp->dregs;
 210
 211         cache_clear(addr, length);
 212
 213         addr &= ~(1);
 214         dregs->dma_addr0 = (addr >> 24) & 0xff;
 215         dregs->dma_addr1 = (addr >> 16) & 0xff;
 216         dregs->dma_addr2 = (addr >>  8) & 0xff;
 217         dregs->dma_addr3 = (addr      ) & 0xff;
 218 }
 219
 220 static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length)
 221 {
 222         struct cyberII_dma_registers *dregs =
 223                 (struct cyberII_dma_registers *) esp->dregs;
 224
 225         cache_push(addr, length);
 226
 227         addr |= 1;
 228         dregs->dma_addr0 = (addr >> 24) & 0xff;
 229         dregs->dma_addr1 = (addr >> 16) & 0xff;
 230         dregs->dma_addr2 = (addr >>  8) & 0xff;
 231         dregs->dma_addr3 = (addr      ) & 0xff;
 232 }
 233
 234 static void dma_ints_off(struct NCR_ESP *esp)
 235 {
 236         disable_irq(esp->irq);
 237 }
 238
 239 static void dma_ints_on(struct NCR_ESP *esp)
 240 {
 241         enable_irq(esp->irq);
 242 }
 243
 244 static int dma_irq_p(struct NCR_ESP *esp)
 245 {
 246         /* It's important to check the DMA IRQ bit in the correct way! */
 247         return (esp_read(esp->eregs->esp_status) & ESP_STAT_INTR);
 248 }
 249
 250 static void dma_led_off(struct NCR_ESP *esp)
 251 {
 252         ((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg &= ~CYBERII_DMA_LED;
 253 }
 254
 255 static void dma_led_on(struct NCR_ESP *esp)
 256 {
 257         ((struct cyberII_dma_registers *)(esp->dregs))->ctrl_reg |= CYBERII_DMA_LED;
 258 }
 259
 260 static int dma_ports_p(struct NCR_ESP *esp)
 261 {
 262         return ((amiga_custom.intenar) & IF_PORTS);
 263 }
 264
 265 static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
 266 {
 267         /* On the Sparc, DMA_ST_WRITE means "move data from device to memory"
 268          * so when (write) is true, it actually means READ!
 269          */
 270         if(write){
 271                 dma_init_read(esp, addr, count);
 272         } else {
 273                 dma_init_write(esp, addr, count);
 274         }
 275 }
 276
 277 #define HOSTS_C
 278
 279 int cyberII_esp_release(struct Scsi_Host *instance)
 280 {
 281 #ifdef MODULE
 282         unsigned long address = (unsigned long)((struct NCR_ESP *)instance->hostdata)->edev;
 283
 284         esp_deallocate((struct NCR_ESP *)instance->hostdata);
 285         esp_release();
 286         release_mem_region(address, sizeof(struct ESP_regs));
 287         free_irq(IRQ_AMIGA_PORTS, esp_intr);
 288 #endif
 289         return 1;
 290 }
 291
 292
 293 static struct scsi_host_template driver_template = {
 294         .proc_name              = "esp-cyberstormII",
 295         .proc_info              = esp_proc_info,
 296         .name                   = "CyberStorm Mk II SCSI",
 297         .detect                 = cyberII_esp_detect,
 298         .slave_alloc            = esp_slave_alloc,
 299         .slave_destroy          = esp_slave_destroy,
 300         .release                = cyberII_esp_release,
 301         .queuecommand           = esp_queue,
 302         .eh_abort_handler       = esp_abort,
 303         .eh_bus_reset_handler   = esp_reset,
 304         .can_queue              = 7,
 305         .this_id                = 7,
 306         .sg_tablesize           = SG_ALL,
 307         .cmd_per_lun            = 1,
 308         .use_clustering         = ENABLE_CLUSTERING
 309 };
 310
 311
 312 #include "scsi_module.c"
 313
 314 MODULE_LICENSE("GPL");