drivers/scsi/NCR_Q720.c

   1 /* -*- mode: c; c-basic-offset: 8 -*- */
   2
   3 /* NCR Quad 720 MCA SCSI Driver
   4  *
   5  * Copyright (C) 2003 by James.Bottomley@HansenPartnership.com
   6  */
   7
   8 #include <linux/blkdev.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/mca.h>
  13 #include <linux/slab.h>
  14 #include <linux/types.h>
  15 #include <linux/init.h>
  16 #include <linux/delay.h>
  17 #include <asm/io.h>
  18
  19 #include "scsi.h"
  20 #include <scsi/scsi_host.h>
  21
  22 #include "ncr53c8xx.h"
  23
  24 #include "NCR_Q720.h"
  25
  26 static struct ncr_chip q720_chip __initdata = {
  27         .revision_id =  0x0f,
  28         .burst_max =    3,
  29         .offset_max =   8,
  30         .nr_divisor =   4,
  31         .features =     FE_WIDE | FE_DIFF | FE_VARCLK,
  32 };
  33
  34 MODULE_AUTHOR("James Bottomley");
  35 MODULE_DESCRIPTION("NCR Quad 720 SCSI Driver");
  36 MODULE_LICENSE("GPL");
  37
  38 #define NCR_Q720_VERSION                "0.9"
  39
  40 /* We needs this helper because we have up to four hosts per struct device */
  41 struct NCR_Q720_private {
  42         struct device           *dev;
  43         void __iomem *          mem_base;
  44         __u32                   phys_mem_base;
  45         __u32                   mem_size;
  46         __u8                    irq;
  47         __u8                    siops;
  48         __u8                    irq_enable;
  49         struct Scsi_Host        *hosts[4];
  50 };
  51
  52 static struct scsi_host_template NCR_Q720_tpnt = {
  53         .module                 = THIS_MODULE,
  54         .proc_name              = "NCR_Q720",
  55 };
  56
  57 static irqreturn_t
  58 NCR_Q720_intr(int irq, void *data)
  59 {
  60         struct NCR_Q720_private *p = (struct NCR_Q720_private *)data;
  61         __u8 sir = (readb(p->mem_base + 0x0d) & 0xf0) >> 4;
  62         __u8 siop;
  63
  64         sir |= ~p->irq_enable;
  65
  66         if(sir == 0xff)
  67                 return IRQ_NONE;
  68
  69
  70         while((siop = ffz(sir)) < p->siops) {
  71                 sir |= 1<<siop;
  72                 ncr53c8xx_intr(irq, p->hosts[siop]);
  73         }
  74         return IRQ_HANDLED;
  75 }
  76
  77 static int __init
  78 NCR_Q720_probe_one(struct NCR_Q720_private *p, int siop,
  79                 int irq, int slot, __u32 paddr, void __iomem *vaddr)
  80 {
  81         struct ncr_device device;
  82         __u8 scsi_id;
  83         static int unit = 0;
  84         __u8 scsr1 = readb(vaddr + NCR_Q720_SCSR_OFFSET + 1);
  85         __u8 differential = readb(vaddr + NCR_Q720_SCSR_OFFSET) & 0x20;
  86         __u8 version;
  87         int error;
  88
  89         scsi_id = scsr1 >> 4;
  90         /* enable burst length 16 (FIXME: should allow this) */
  91         scsr1 |= 0x02;
  92         /* force a siop reset */
  93         scsr1 |= 0x04;
  94         writeb(scsr1, vaddr + NCR_Q720_SCSR_OFFSET + 1);
  95         udelay(10);
  96         version = readb(vaddr + 0x18) >> 4;
  97
  98         memset(&device, 0, sizeof(struct ncr_device));
  99                 /* Initialise ncr_device structure with items required by ncr_attach. */
 100         device.chip             = q720_chip;
 101         device.chip.revision_id = version;
 102         device.host_id          = scsi_id;
 103         device.dev              = p->dev;
 104         device.slot.base        = paddr;
 105         device.slot.base_c      = paddr;
 106         device.slot.base_v      = vaddr;
 107         device.slot.irq         = irq;
 108         device.differential     = differential ? 2 : 0;
 109         printk("Q720 probe unit %d (siop%d) at 0x%lx, diff = %d, vers = %d\n", unit, siop,
 110                (unsigned long)paddr, differential, version);
 111
 112         p->hosts[siop] = ncr_attach(&NCR_Q720_tpnt, unit++, &device);
 113
 114         if (!p->hosts[siop])
 115                 goto fail;
 116
 117         p->irq_enable |= (1<<siop);
 118         scsr1 = readb(vaddr + NCR_Q720_SCSR_OFFSET + 1);
 119         /* clear the disable interrupt bit */
 120         scsr1 &= ~0x01;
 121         writeb(scsr1, vaddr + NCR_Q720_SCSR_OFFSET + 1);
 122
 123         error = scsi_add_host(p->hosts[siop], p->dev);
 124         if (error)
 125                 ncr53c8xx_release(p->hosts[siop]);
 126         else
 127                 scsi_scan_host(p->hosts[siop]);
 128         return error;
 129
 130  fail:
 131         return -ENODEV;
 132 }
 133
 134 /* Detect a Q720 card.  Note, because of the setup --- the chips are
 135  * essentially connectecd to the MCA bus independently, it is easier
 136  * to set them up as two separate host adapters, rather than one
 137  * adapter with two channels */
 138 static int __init
 139 NCR_Q720_probe(struct device *dev)
 140 {
 141         struct NCR_Q720_private *p;
 142         static int banner = 1;
 143         struct mca_device *mca_dev = to_mca_device(dev);
 144         int slot = mca_dev->slot;
 145         int found = 0;
 146         int irq, i, siops;
 147         __u8 pos2, pos4, asr2, asr9, asr10;
 148         __u16 io_base;
 149         __u32 base_addr, mem_size;
 150         void __iomem *mem_base;
 151
 152         p = kzalloc(sizeof(*p), GFP_KERNEL);
 153         if (!p)
 154                 return -ENOMEM;
 155
 156         pos2 = mca_device_read_pos(mca_dev, 2);
 157         /* enable device */
 158         pos2 |=  NCR_Q720_POS2_BOARD_ENABLE | NCR_Q720_POS2_INTERRUPT_ENABLE;
 159         mca_device_write_pos(mca_dev, 2, pos2);
 160
 161         io_base = (pos2 & NCR_Q720_POS2_IO_MASK) << NCR_Q720_POS2_IO_SHIFT;
 162
 163
 164         if(banner) {
 165                 printk(KERN_NOTICE "NCR Q720: Driver Version " NCR_Q720_VERSION "\n"
 166                        "NCR Q720:  Copyright (c) 2003 by James.Bottomley@HansenPartnership.com\n"
 167                        "NCR Q720:\n");
 168                 banner = 0;
 169         }
 170         io_base = mca_device_transform_ioport(mca_dev, io_base);
 171
 172         /* OK, this is phase one of the bootstrap, we now know the
 173          * I/O space base address.  All the configuration registers
 174          * are mapped here (including pos) */
 175
 176         /* sanity check I/O mapping */
 177         i = inb(io_base) | (inb(io_base+1)<<8);
 178         if(i != NCR_Q720_MCA_ID) {
 179                 printk(KERN_ERR "NCR_Q720, adapter failed to I/O map registers correctly at 0x%x(0x%x)\n", io_base, i);
 180                 kfree(p);
 181                 return -ENODEV;
 182         }
 183
 184         /* Phase II, find the ram base and memory map the board register */
 185         pos4 = inb(io_base + 4);
 186         /* enable streaming data */
 187         pos4 |= 0x01;
 188         outb(pos4, io_base + 4);
 189         base_addr = (pos4 & 0x7e) << 20;
 190         base_addr += (pos4 & 0x80) << 23;
 191         asr10 = inb(io_base + 0x12);
 192         base_addr += (asr10 & 0x80) << 24;
 193         base_addr += (asr10 & 0x70) << 23;
 194
 195         /* OK, got the base addr, now we need to find the ram size,
 196          * enable and map it */
 197         asr9 = inb(io_base + 0x11);
 198         i = (asr9 & 0xc0) >> 6;
 199         if(i == 0)
 200                 mem_size = 1024;
 201         else
 202                 mem_size = 1 << (19 + i);
 203
 204         /* enable the sram mapping */
 205         asr9 |= 0x20;
 206
 207         /* disable the rom mapping */
 208         asr9 &= ~0x10;
 209
 210         outb(asr9, io_base + 0x11);
 211
 212         if(!request_mem_region(base_addr, mem_size, "NCR_Q720")) {
 213                 printk(KERN_ERR "NCR_Q720: Failed to claim memory region 0x%lx\n-0x%lx",
 214                        (unsigned long)base_addr,
 215                        (unsigned long)(base_addr + mem_size));
 216                 goto out_free;
 217         }
 218
 219         if (dma_declare_coherent_memory(dev, base_addr, base_addr,
 220                                         mem_size, 0)) {
 221                 printk(KERN_ERR "NCR_Q720: DMA declare memory failed\n");
 222                 goto out_release_region;
 223         }
 224
 225         /* The first 1k of the memory buffer is a memory map of the registers
 226          */
 227         mem_base = dma_mark_declared_memory_occupied(dev, base_addr,
 228                                                             1024);
 229         if (IS_ERR(mem_base)) {
 230                 printk("NCR_Q720 failed to reserve memory mapped region\n");
 231                 goto out_release;
 232         }
 233
 234         /* now also enable accesses in asr 2 */
 235         asr2 = inb(io_base + 0x0a);
 236
 237         asr2 |= 0x01;
 238
 239         outb(asr2, io_base + 0x0a);
 240
 241         /* get the number of SIOPs (this should be 2 or 4) */
 242         siops = ((asr2 & 0xe0) >> 5) + 1;
 243
 244         /* sanity check mapping (again) */
 245         i = readw(mem_base);
 246         if(i != NCR_Q720_MCA_ID) {
 247                 printk(KERN_ERR "NCR_Q720, adapter failed to memory map registers correctly at 0x%lx(0x%x)\n", (unsigned long)base_addr, i);
 248                 goto out_release;
 249         }
 250
 251         irq = readb(mem_base + 5) & 0x0f;
 252
 253
 254         /* now do the bus related transforms */
 255         irq = mca_device_transform_irq(mca_dev, irq);
 256
 257         printk(KERN_NOTICE "NCR Q720: found in slot %d  irq = %d  mem base = 0x%lx siops = %d\n", slot, irq, (unsigned long)base_addr, siops);
 258         printk(KERN_NOTICE "NCR Q720: On board ram %dk\n", mem_size/1024);
 259
 260         p->dev = dev;
 261         p->mem_base = mem_base;
 262         p->phys_mem_base = base_addr;
 263         p->mem_size = mem_size;
 264         p->irq = irq;
 265         p->siops = siops;
 266
 267         if (request_irq(irq, NCR_Q720_intr, IRQF_SHARED, "NCR_Q720", p)) {
 268                 printk(KERN_ERR "NCR_Q720: request irq %d failed\n", irq);
 269                 goto out_release;
 270         }
 271         /* disable all the siop interrupts */
 272         for(i = 0; i < siops; i++) {
 273                 void __iomem *reg_scsr1 = mem_base + NCR_Q720_CHIP_REGISTER_OFFSET
 274                         + i*NCR_Q720_SIOP_SHIFT + NCR_Q720_SCSR_OFFSET + 1;
 275                 __u8 scsr1 = readb(reg_scsr1);
 276                 scsr1 |= 0x01;
 277                 writeb(scsr1, reg_scsr1);
 278         }
 279
 280         /* plumb in all 720 chips */
 281         for (i = 0; i < siops; i++) {
 282                 void __iomem *siop_v_base = mem_base + NCR_Q720_CHIP_REGISTER_OFFSET
 283                         + i*NCR_Q720_SIOP_SHIFT;
 284                 __u32 siop_p_base = base_addr + NCR_Q720_CHIP_REGISTER_OFFSET
 285                         + i*NCR_Q720_SIOP_SHIFT;
 286                 __u16 port = io_base + NCR_Q720_CHIP_REGISTER_OFFSET
 287                         + i*NCR_Q720_SIOP_SHIFT;
 288                 int err;
 289
 290                 outb(0xff, port + 0x40);
 291                 outb(0x07, port + 0x41);
 292                 if ((err = NCR_Q720_probe_one(p, i, irq, slot,
 293                                               siop_p_base, siop_v_base)) != 0)
 294                         printk("Q720: SIOP%d: probe failed, error = %d\n",
 295                                i, err);
 296                 else
 297                         found++;
 298         }
 299
 300         if (!found) {
 301                 kfree(p);
 302                 return -ENODEV;
 303         }
 304
 305         mca_device_set_claim(mca_dev, 1);
 306         mca_device_set_name(mca_dev, "NCR_Q720");
 307         dev_set_drvdata(dev, p);
 308
 309         return 0;
 310
 311  out_release:
 312         dma_release_declared_memory(dev);
 313  out_release_region:
 314         release_mem_region(base_addr, mem_size);
 315  out_free:
 316         kfree(p);
 317
 318         return -ENODEV;
 319 }
 320
 321 static void __exit
 322 NCR_Q720_remove_one(struct Scsi_Host *host)
 323 {
 324         scsi_remove_host(host);
 325         ncr53c8xx_release(host);
 326 }
 327
 328 static int __exit
 329 NCR_Q720_remove(struct device *dev)
 330 {
 331         struct NCR_Q720_private *p = dev_get_drvdata(dev);
 332         int i;
 333
 334         for (i = 0; i < p->siops; i++)
 335                 if(p->hosts[i])
 336                         NCR_Q720_remove_one(p->hosts[i]);
 337
 338         dma_release_declared_memory(dev);
 339         release_mem_region(p->phys_mem_base, p->mem_size);
 340         free_irq(p->irq, p);
 341         kfree(p);
 342         return 0;
 343 }
 344
 345 static short NCR_Q720_id_table[] = { NCR_Q720_MCA_ID, 0 };
 346
 347 static struct mca_driver NCR_Q720_driver = {
 348         .id_table = NCR_Q720_id_table,
 349         .driver = {
 350                 .name           = "NCR_Q720",
 351                 .bus            = &mca_bus_type,
 352                 .probe          = NCR_Q720_probe,
 353                 .remove         = NCR_Q720_remove,
 354         },
 355 };
 356
 357 static int __init
 358 NCR_Q720_init(void)
 359 {
 360         int ret = ncr53c8xx_init();
 361         if (!ret)
 362                 ret = mca_register_driver(&NCR_Q720_driver);
 363         if (ret)
 364                 ncr53c8xx_exit();
 365         return ret;
 366 }
 367
 368 static void __exit
 369 NCR_Q720_exit(void)
 370 {
 371         mca_unregister_driver(&NCR_Q720_driver);
 372         ncr53c8xx_exit();
 373 }
 374
 375 module_init(NCR_Q720_init);
 376 module_exit(NCR_Q720_exit);