linux/drivers/scsi/NCR_D700.c
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   1/* -*- mode: c; c-basic-offset: 8 -*- */
   2
   3/* NCR Dual 700 MCA SCSI Driver
   4 *
   5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
   6**-----------------------------------------------------------------------------
   7**  
   8**  This program is free software; you can redistribute it and/or modify
   9**  it under the terms of the GNU General Public License as published by
  10**  the Free Software Foundation; either version 2 of the License, or
  11**  (at your option) any later version.
  12**
  13**  This program is distributed in the hope that it will be useful,
  14**  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16**  GNU General Public License for more details.
  17**
  18**  You should have received a copy of the GNU General Public License
  19**  along with this program; if not, write to the Free Software
  20**  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21**
  22**-----------------------------------------------------------------------------
  23 */
  24
  25/* Notes:
  26 *
  27 * Most of the work is done in the chip specific module, 53c700.o
  28 *
  29 * TODO List:
  30 *
  31 * 1. Extract the SCSI ID from the voyager CMOS table (necessary to
  32 *    support multi-host environments.
  33 *
  34 * */
  35
  36
  37/* CHANGELOG 
  38 *
  39 * Version 2.2
  40 *
  41 * Added mca_set_adapter_name().
  42 *
  43 * Version 2.1
  44 *
  45 * Modularise the driver into a Board piece (this file) and a chip
  46 * piece 53c700.[ch] and 53c700.scr, added module options.  You can
  47 * now specify the scsi id by the parameters
  48 *
  49 * NCR_D700=slot:<n> [siop:<n>] id:<n> ....
  50 *
  51 * They need to be comma separated if compiled into the kernel
  52 *
  53 * Version 2.0
  54 *
  55 * Initial implementation of TCQ (Tag Command Queueing).  TCQ is full
  56 * featured and uses the clock algorithm to keep track of outstanding
  57 * tags and guard against individual tag starvation.  Also fixed a bug
  58 * in all of the 1.x versions where the D700_data_residue() function
  59 * was returning results off by 32 bytes (and thus causing the same 32
  60 * bytes to be written twice corrupting the data block).  It turns out
  61 * the 53c700 only has a 6 bit DBC and DFIFO registers not 7 bit ones
  62 * like the 53c710 (The 710 is the only data manual still available,
  63 * which I'd been using to program the 700).
  64 *
  65 * Version 1.2
  66 *
  67 * Much improved message handling engine
  68 *
  69 * Version 1.1
  70 *
  71 * Add code to handle selection reasonably correctly.  By the time we
  72 * get the selection interrupt, we've already responded, but drop off the
  73 * bus and hope the selector will go away.
  74 *
  75 * Version 1.0:
  76 *
  77 *   Initial release.  Fully functional except for procfs and tag
  78 * command queueing.  Has only been tested on cards with 53c700-66
  79 * chips and only single ended. Features are
  80 *
  81 * 1. Synchronous data transfers to offset 8 (limit of 700-66) and
  82 *    100ns (10MHz) limit of SCSI-2
  83 *
  84 * 2. Disconnection and reselection
  85 *
  86 * Testing:
  87 * 
  88 *  I've only really tested this with the 700-66 chip, but have done
  89 * soak tests in multi-device environments to verify that
  90 * disconnections and reselections are being processed correctly.
  91 * */
  92
  93#define NCR_D700_VERSION "2.2"
  94
  95#include <linux/blkdev.h>
  96#include <linux/interrupt.h>
  97#include <linux/kernel.h>
  98#include <linux/module.h>
  99#include <linux/mca.h>
 100#include <linux/slab.h>
 101#include <asm/io.h>
 102#include <scsi/scsi_host.h>
 103#include <scsi/scsi_device.h>
 104#include <scsi/scsi_transport.h>
 105#include <scsi/scsi_transport_spi.h>
 106
 107#include "53c700.h"
 108#include "NCR_D700.h"
 109
 110static char *NCR_D700;          /* command line from insmod */
 111
 112MODULE_AUTHOR("James Bottomley");
 113MODULE_DESCRIPTION("NCR Dual700 SCSI Driver");
 114MODULE_LICENSE("GPL");
 115module_param(NCR_D700, charp, 0);
 116
 117static __u8 id_array[2*(MCA_MAX_SLOT_NR + 1)] =
 118        { [0 ... 2*(MCA_MAX_SLOT_NR + 1)-1] = 7 };
 119
 120#ifdef MODULE
 121#define ARG_SEP ' '
 122#else
 123#define ARG_SEP ','
 124#endif
 125
 126static int __init
 127param_setup(char *string)
 128{
 129        char *pos = string, *next;
 130        int slot = -1, siop = -1;
 131
 132        while(pos != NULL && (next = strchr(pos, ':')) != NULL) {
 133                int val = (int)simple_strtoul(++next, NULL, 0);
 134
 135                if(!strncmp(pos, "slot:", 5))
 136                        slot = val;
 137                else if(!strncmp(pos, "siop:", 5))
 138                        siop = val;
 139                else if(!strncmp(pos, "id:", 3)) {
 140                        if(slot == -1) {
 141                                printk(KERN_WARNING "NCR D700: Must specify slot for id parameter\n");
 142                        } else if(slot > MCA_MAX_SLOT_NR) {
 143                                printk(KERN_WARNING "NCR D700: Illegal slot %d for id %d\n", slot, val);
 144                        } else {
 145                                if(siop != 0 && siop != 1) {
 146                                        id_array[slot*2] = val;
 147                                        id_array[slot*2 + 1] =val;
 148                                } else {
 149                                        id_array[slot*2 + siop] = val;
 150                                }
 151                        }
 152                }
 153                if((pos = strchr(pos, ARG_SEP)) != NULL)
 154                        pos++;
 155        }
 156        return 1;
 157}
 158
 159/* Host template.  The 53c700 routine NCR_700_detect will
 160 * fill in all of the missing routines */
 161static struct scsi_host_template NCR_D700_driver_template = {
 162        .module                 = THIS_MODULE,
 163        .name                   = "NCR Dual 700 MCA",
 164        .proc_name              = "NCR_D700",
 165        .this_id                = 7,
 166};
 167
 168/* We needs this helper because we have two hosts per struct device */
 169struct NCR_D700_private {
 170        struct device           *dev;
 171        struct Scsi_Host        *hosts[2];
 172        char                    name[30];
 173        char                    pad;
 174};
 175
 176static int
 177NCR_D700_probe_one(struct NCR_D700_private *p, int siop, int irq,
 178                   int slot, u32 region, int differential)
 179{
 180        struct NCR_700_Host_Parameters *hostdata;
 181        struct Scsi_Host *host;
 182        int ret;
 183
 184        hostdata = kzalloc(sizeof(*hostdata), GFP_KERNEL);
 185        if (!hostdata) {
 186                printk(KERN_ERR "NCR D700: SIOP%d: Failed to allocate host"
 187                       "data, detatching\n", siop);
 188                return -ENOMEM;
 189        }
 190
 191        if (!request_region(region, 64, "NCR_D700")) {
 192                printk(KERN_ERR "NCR D700: Failed to reserve IO region 0x%x\n",
 193                                region);
 194                ret = -ENODEV;
 195                goto region_failed;
 196        }
 197                
 198        /* Fill in the three required pieces of hostdata */
 199        hostdata->base = ioport_map(region, 64);
 200        hostdata->differential = (((1<<siop) & differential) != 0);
 201        hostdata->clock = NCR_D700_CLOCK_MHZ;
 202        hostdata->burst_length = 8;
 203
 204        /* and register the siop */
 205        host = NCR_700_detect(&NCR_D700_driver_template, hostdata, p->dev);
 206        if (!host) {
 207                ret = -ENOMEM;
 208                goto detect_failed;
 209        }
 210
 211        p->hosts[siop] = host;
 212        /* FIXME: read this from SUS */
 213        host->this_id = id_array[slot * 2 + siop];
 214        host->irq = irq;
 215        host->base = region;
 216        scsi_scan_host(host);
 217
 218        return 0;
 219
 220 detect_failed:
 221        release_region(region, 64);
 222 region_failed:
 223        kfree(hostdata);
 224
 225        return ret;
 226}
 227
 228static irqreturn_t
 229NCR_D700_intr(int irq, void *data)
 230{
 231        struct NCR_D700_private *p = (struct NCR_D700_private *)data;
 232        int i, found = 0;
 233
 234        for (i = 0; i < 2; i++)
 235                if (p->hosts[i] &&
 236                    NCR_700_intr(irq, p->hosts[i]) == IRQ_HANDLED)
 237                        found++;
 238
 239        return found ? IRQ_HANDLED : IRQ_NONE;
 240}
 241
 242/* Detect a D700 card.  Note, because of the setup --- the chips are
 243 * essentially connectecd to the MCA bus independently, it is easier
 244 * to set them up as two separate host adapters, rather than one
 245 * adapter with two channels */
 246static int
 247NCR_D700_probe(struct device *dev)
 248{
 249        struct NCR_D700_private *p;
 250        int differential;
 251        static int banner = 1;
 252        struct mca_device *mca_dev = to_mca_device(dev);
 253        int slot = mca_dev->slot;
 254        int found = 0;
 255        int irq, i;
 256        int pos3j, pos3k, pos3a, pos3b, pos4;
 257        __u32 base_addr, offset_addr;
 258
 259        /* enable board interrupt */
 260        pos4 = mca_device_read_pos(mca_dev, 4);
 261        pos4 |= 0x4;
 262        mca_device_write_pos(mca_dev, 4, pos4);
 263
 264        mca_device_write_pos(mca_dev, 6, 9);
 265        pos3j = mca_device_read_pos(mca_dev, 3);
 266        mca_device_write_pos(mca_dev, 6, 10);
 267        pos3k = mca_device_read_pos(mca_dev, 3);
 268        mca_device_write_pos(mca_dev, 6, 0);
 269        pos3a = mca_device_read_pos(mca_dev, 3);
 270        mca_device_write_pos(mca_dev, 6, 1);
 271        pos3b = mca_device_read_pos(mca_dev, 3);
 272
 273        base_addr = ((pos3j << 8) | pos3k) & 0xfffffff0;
 274        offset_addr = ((pos3a << 8) | pos3b) & 0xffffff70;
 275
 276        irq = (pos4 & 0x3) + 11;
 277        if(irq >= 13)
 278                irq++;
 279        if(banner) {
 280                printk(KERN_NOTICE "NCR D700: Driver Version " NCR_D700_VERSION "\n"
 281                       "NCR D700:  Copyright (c) 2001 by James.Bottomley@HansenPartnership.com\n"
 282                       "NCR D700:\n");
 283                banner = 0;
 284        }
 285        /* now do the bus related transforms */
 286        irq = mca_device_transform_irq(mca_dev, irq);
 287        base_addr = mca_device_transform_ioport(mca_dev, base_addr);
 288        offset_addr = mca_device_transform_ioport(mca_dev, offset_addr);
 289
 290        printk(KERN_NOTICE "NCR D700: found in slot %d  irq = %d  I/O base = 0x%x\n", slot, irq, offset_addr);
 291
 292        /*outb(BOARD_RESET, base_addr);*/
 293
 294        /* clear any pending interrupts */
 295        (void)inb(base_addr + 0x08);
 296        /* get modctl, used later for setting diff bits */
 297        switch(differential = (inb(base_addr + 0x08) >> 6)) {
 298        case 0x00:
 299                /* only SIOP1 differential */
 300                differential = 0x02;
 301                break;
 302        case 0x01:
 303                /* Both SIOPs differential */
 304                differential = 0x03;
 305                break;
 306        case 0x03:
 307                /* No SIOPs differential */
 308                differential = 0x00;
 309                break;
 310        default:
 311                printk(KERN_ERR "D700: UNEXPECTED DIFFERENTIAL RESULT 0x%02x\n",
 312                       differential);
 313                differential = 0x00;
 314                break;
 315        }
 316
 317        p = kzalloc(sizeof(*p), GFP_KERNEL);
 318        if (!p)
 319                return -ENOMEM;
 320
 321        p->dev = dev;
 322        snprintf(p->name, sizeof(p->name), "D700(%s)", dev_name(dev));
 323        if (request_irq(irq, NCR_D700_intr, IRQF_SHARED, p->name, p)) {
 324                printk(KERN_ERR "D700: request_irq failed\n");
 325                kfree(p);
 326                return -EBUSY;
 327        }
 328        /* plumb in both 700 chips */
 329        for (i = 0; i < 2; i++) {
 330                int err;
 331
 332                if ((err = NCR_D700_probe_one(p, i, irq, slot,
 333                                              offset_addr + (0x80 * i),
 334                                              differential)) != 0)
 335                        printk("D700: SIOP%d: probe failed, error = %d\n",
 336                               i, err);
 337                else
 338                        found++;
 339        }
 340
 341        if (!found) {
 342                kfree(p);
 343                return -ENODEV;
 344        }
 345
 346        mca_device_set_claim(mca_dev, 1);
 347        mca_device_set_name(mca_dev, "NCR_D700");
 348        dev_set_drvdata(dev, p);
 349        return 0;
 350}
 351
 352static void
 353NCR_D700_remove_one(struct Scsi_Host *host)
 354{
 355        scsi_remove_host(host);
 356        NCR_700_release(host);
 357        kfree((struct NCR_700_Host_Parameters *)host->hostdata[0]);
 358        free_irq(host->irq, host);
 359        release_region(host->base, 64);
 360}
 361
 362static int
 363NCR_D700_remove(struct device *dev)
 364{
 365        struct NCR_D700_private *p = dev_get_drvdata(dev);
 366        int i;
 367
 368        for (i = 0; i < 2; i++)
 369                NCR_D700_remove_one(p->hosts[i]);
 370
 371        kfree(p);
 372        return 0;
 373}
 374
 375static short NCR_D700_id_table[] = { NCR_D700_MCA_ID, 0 };
 376
 377static struct mca_driver NCR_D700_driver = {
 378        .id_table = NCR_D700_id_table,
 379        .driver = {
 380                .name           = "NCR_D700",
 381                .bus            = &mca_bus_type,
 382                .probe          = NCR_D700_probe,
 383                .remove         = NCR_D700_remove,
 384        },
 385};
 386
 387static int __init NCR_D700_init(void)
 388{
 389#ifdef MODULE
 390        if (NCR_D700)
 391                param_setup(NCR_D700);
 392#endif
 393
 394        return mca_register_driver(&NCR_D700_driver);
 395}
 396
 397static void __exit NCR_D700_exit(void)
 398{
 399        mca_unregister_driver(&NCR_D700_driver);
 400}
 401
 402module_init(NCR_D700_init);
 403module_exit(NCR_D700_exit);
 404
 405__setup("NCR_D700=", param_setup);
 406
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