drivers/scsi/pluto.c

   1 /* pluto.c: SparcSTORAGE Array SCSI host adapter driver.
   2  *
   3  * Copyright (C) 1997,1998,1999 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   4  *
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/delay.h>
   9 #include <linux/types.h>
  10 #include <linux/string.h>
  11 #include <linux/malloc.h>
  12 #include <linux/blk.h>
  13 #include <linux/proc_fs.h>
  14 #include <linux/stat.h>
  15 #include <linux/init.h>
  16 #include <linux/config.h>
  17 #ifdef CONFIG_KMOD
  18 #include <linux/kmod.h>
  19 #endif
  20
  21 #include <asm/irq.h>
  22
  23 #include "scsi.h"
  24 #include "hosts.h"
  25 #include "../fc4/fcp_impl.h"
  26 #include "pluto.h"
  27
  28 #include <linux/module.h>
  29
  30 /* #define PLUTO_DEBUG */
  31
  32 #define pluto_printk printk ("PLUTO %s: ", fc->name); printk
  33
  34 #ifdef PLUTO_DEBUG
  35 #define PLD(x)  pluto_printk x;
  36 #define PLND(x) printk ("PLUTO: "); printk x;
  37 #else
  38 #define PLD(x)
  39 #define PLND(x)
  40 #endif
  41
  42 static struct ctrl_inquiry {
  43         struct Scsi_Host host;
  44         struct pluto pluto;
  45         Scsi_Cmnd cmd;
  46         char inquiry[256];
  47         fc_channel *fc;
  48 } *fcs __initdata = { 0 };
  49 static int fcscount __initdata = 0;
  50 static atomic_t fcss __initdata = ATOMIC_INIT(0);
  51 DECLARE_MUTEX_LOCKED(fc_sem);
  52
  53 static int pluto_encode_addr(Scsi_Cmnd *SCpnt, u16 *addr, fc_channel *fc, fcp_cmnd *fcmd);
  54
  55 static void __init pluto_detect_timeout(unsigned long data)
  56 {
  57         PLND(("Timeout\n"))
  58         up(&fc_sem);
  59 }
  60
  61 static void __init pluto_detect_done(Scsi_Cmnd *SCpnt)
  62 {
  63         /* Do nothing */
  64 }
  65
  66 static void __init pluto_detect_scsi_done(Scsi_Cmnd *SCpnt)
  67 {
  68         SCpnt->request.rq_status = RQ_SCSI_DONE;
  69         PLND(("Detect done %08lx\n", (long)SCpnt))
  70         if (atomic_dec_and_test (&fcss))
  71                 up(&fc_sem);
  72 }
  73
  74 static void pluto_select_queue_depths(struct Scsi_Host *host, Scsi_Device *devlist)
  75 {
  76         Scsi_Device *device;
  77
  78         for (device = devlist; device; device = device->next) {
  79                 if (device->host != host) continue;
  80                 if (device->tagged_supported)
  81                         device->queue_depth = /* 254 */ 8;
  82                 else
  83                         device->queue_depth = 2;
  84         }
  85 }
  86
  87 /* Detect all SSAs attached to the machine.
  88    To be fast, do it on all online FC channels at the same time. */
  89 int __init pluto_detect(Scsi_Host_Template *tpnt)
  90 {
  91         int i, retry, nplutos;
  92         fc_channel *fc;
  93         Scsi_Device dev;
  94         struct timer_list fc_timer = { function: pluto_detect_timeout };
  95
  96         tpnt->proc_name = "pluto";
  97         fcscount = 0;
  98         for_each_online_fc_channel(fc) {
  99                 if (!fc->posmap)
 100                         fcscount++;
 101         }
 102         PLND(("%d channels online\n", fcscount))
 103         if (!fcscount) {
 104 #if defined(MODULE) && defined(CONFIG_FC4_SOC_MODULE) && defined(CONFIG_KMOD)
 105                 request_module("soc");
 106
 107                 for_each_online_fc_channel(fc) {
 108                         if (!fc->posmap)
 109                                 fcscount++;
 110                 }
 111                 if (!fcscount)
 112 #endif
 113                         return 0;
 114         }
 115         fcs = (struct ctrl_inquiry *) kmalloc (sizeof (struct ctrl_inquiry) * fcscount, GFP_DMA);
 116         if (!fcs) {
 117                 printk ("PLUTO: Not enough memory to probe\n");
 118                 return 0;
 119         }
 120
 121         memset (fcs, 0, sizeof (struct ctrl_inquiry) * fcscount);
 122         memset (&dev, 0, sizeof(dev));
 123         atomic_set (&fcss, fcscount);
 124
 125         i = 0;
 126         for_each_online_fc_channel(fc) {
 127                 Scsi_Cmnd *SCpnt;
 128                 struct Scsi_Host *host;
 129                 struct pluto *pluto;
 130
 131                 if (i == fcscount) break;
 132                 if (fc->posmap) continue;
 133
 134                 PLD(("trying to find SSA\n"))
 135
 136                 /* If this is already registered to some other SCSI host, then it cannot be pluto */
 137                 if (fc->scsi_name[0]) continue;
 138                 memcpy (fc->scsi_name, "SSA", 4);
 139
 140                 fcs[i].fc = fc;
 141
 142                 fc->can_queue = PLUTO_CAN_QUEUE;
 143                 fc->rsp_size = 64;
 144                 fc->encode_addr = pluto_encode_addr;
 145
 146                 fc->fcp_register(fc, TYPE_SCSI_FCP, 0);
 147
 148                 SCpnt = &(fcs[i].cmd);
 149                 host = &(fcs[i].host);
 150                 pluto = (struct pluto *)host->hostdata;
 151
 152                 pluto->fc = fc;
 153
 154                 SCpnt->host = host;
 155                 SCpnt->cmnd[0] = INQUIRY;
 156                 SCpnt->cmnd[4] = 255;
 157
 158                 /* FC layer requires this, so that SCpnt->device->tagged_supported is initially 0 */
 159                 SCpnt->device = &dev;
 160
 161                 SCpnt->cmd_len = COMMAND_SIZE(INQUIRY);
 162
 163                 SCpnt->request.rq_status = RQ_SCSI_BUSY;
 164
 165                 SCpnt->done = pluto_detect_done;
 166                 SCpnt->bufflen = 256;
 167                 SCpnt->buffer = fcs[i].inquiry;
 168                 SCpnt->request_bufflen = 256;
 169                 SCpnt->request_buffer = fcs[i].inquiry;
 170                 PLD(("set up %d %08lx\n", i, (long)SCpnt))
 171                 i++;
 172         }
 173
 174         for (retry = 0; retry < 5; retry++) {
 175                 for (i = 0; i < fcscount; i++) {
 176                         if (!fcs[i].fc) break;
 177                         if (fcs[i].cmd.request.rq_status != RQ_SCSI_DONE) {
 178                                 disable_irq(fcs[i].fc->irq);
 179                                 PLND(("queuecommand %d %d\n", retry, i))
 180                                 fcp_scsi_queuecommand (&(fcs[i].cmd),
 181                                         pluto_detect_scsi_done);
 182                                 enable_irq(fcs[i].fc->irq);
 183                         }
 184                 }
 185
 186                 fc_timer.expires = jiffies + 10 * HZ;
 187                 add_timer(&fc_timer);
 188
 189                 down(&fc_sem);
 190                 PLND(("Woken up\n"))
 191                 if (!atomic_read(&fcss))
 192                         break; /* All fc channels have answered us */
 193         }
 194         del_timer_sync(&fc_timer);
 195
 196         PLND(("Finished search\n"))
 197         for (i = 0, nplutos = 0; i < fcscount; i++) {
 198                 Scsi_Cmnd *SCpnt;
 199
 200                 if (!(fc = fcs[i].fc)) break;
 201
 202                 SCpnt = &(fcs[i].cmd);
 203
 204                 /* Let FC mid-level free allocated resources */
 205                 SCpnt->done (SCpnt);
 206
 207                 if (!SCpnt->result) {
 208                         struct pluto_inquiry *inq;
 209                         struct pluto *pluto;
 210                         struct Scsi_Host *host;
 211
 212                         inq = (struct pluto_inquiry *)fcs[i].inquiry;
 213
 214                         if ((inq->dtype & 0x1f) == TYPE_PROCESSOR &&
 215                             !strncmp (inq->vendor_id, "SUN", 3) &&
 216                             !strncmp (inq->product_id, "SSA", 3)) {
 217                                 char *p;
 218                                 long *ages;
 219
 220                                 ages = kmalloc (((inq->channels + 1) * inq->targets) * sizeof(long), GFP_KERNEL);
 221                                 if (!ages) continue;
 222
 223                                 host = scsi_register (tpnt, sizeof (struct pluto));
 224                                 if (!host) panic ("Cannot register PLUTO host\n");
 225
 226                                 nplutos++;
 227
 228                                 if (fc->module) __MOD_INC_USE_COUNT(fc->module);
 229
 230                                 pluto = (struct pluto *)host->hostdata;
 231
 232                                 host->max_id = inq->targets;
 233                                 host->max_channel = inq->channels;
 234                                 host->irq = fc->irq;
 235
 236 #ifdef __sparc_v9__
 237                                 host->unchecked_isa_dma = 1;
 238 #endif
 239
 240                                 host->select_queue_depths = pluto_select_queue_depths;
 241
 242                                 fc->channels = inq->channels + 1;
 243                                 fc->targets = inq->targets;
 244                                 fc->ages = ages;
 245                                 memset (ages, 0, ((inq->channels + 1) * inq->targets) * sizeof(long));
 246
 247                                 pluto->fc = fc;
 248                                 memcpy (pluto->rev_str, inq->revision, 4);
 249                                 pluto->rev_str[4] = 0;
 250                                 p = strchr (pluto->rev_str, ' ');
 251                                 if (p) *p = 0;
 252                                 memcpy (pluto->fw_rev_str, inq->fw_revision, 4);
 253                                 pluto->fw_rev_str[4] = 0;
 254                                 p = strchr (pluto->fw_rev_str, ' ');
 255                                 if (p) *p = 0;
 256                                 memcpy (pluto->serial_str, inq->serial, 12);
 257                                 pluto->serial_str[12] = 0;
 258                                 p = strchr (pluto->serial_str, ' ');
 259                                 if (p) *p = 0;
 260
 261                                 PLD(("Found SSA rev %s fw rev %s serial %s %dx%d\n", pluto->rev_str, pluto->fw_rev_str, pluto->serial_str, host->max_channel, host->max_id))
 262                         } else
 263                                 fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 264                 } else
 265                         fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 266         }
 267         kfree((char *)fcs);
 268         if (nplutos)
 269                 printk ("PLUTO: Total of %d SparcSTORAGE Arrays found\n", nplutos);
 270         return nplutos;
 271 }
 272
 273 int pluto_release(struct Scsi_Host *host)
 274 {
 275         struct pluto *pluto = (struct pluto *)host->hostdata;
 276         fc_channel *fc = pluto->fc;
 277
 278         if (fc->module) __MOD_DEC_USE_COUNT(fc->module);
 279
 280         fc->fcp_register(fc, TYPE_SCSI_FCP, 1);
 281         PLND((" releasing pluto.\n"));
 282         kfree (fc->ages);
 283         PLND(("released pluto!\n"));
 284         return 0;
 285 }
 286
 287 const char *pluto_info(struct Scsi_Host *host)
 288 {
 289         static char buf[128], *p;
 290         struct pluto *pluto = (struct pluto *) host->hostdata;
 291
 292         sprintf(buf, "SUN SparcSTORAGE Array %s fw %s serial %s %dx%d on %s",
 293                 pluto->rev_str, pluto->fw_rev_str, pluto->serial_str,
 294                 host->max_channel, host->max_id, pluto->fc->name);
 295 #ifdef __sparc__
 296         p = strchr(buf, 0);
 297         sprintf(p, " PROM node %x", pluto->fc->dev->prom_node);
 298 #endif
 299         return buf;
 300 }
 301
 302 /* SSA uses this FC4S addressing:
 303    switch (addr[0])
 304    {
 305    case 0: CONTROLLER - All of addr[1]..addr[3] has to be 0
 306    case 1: SINGLE DISK - addr[1] channel, addr[2] id, addr[3] 0
 307    case 2: DISK GROUP - ???
 308    }
 309
 310    So that SCSI mid-layer can access to these, we reserve
 311    channel 0 id 0 lun 0 for CONTROLLER
 312    and channels 1 .. max_channel are normal single disks.
 313  */
 314 static int pluto_encode_addr(Scsi_Cmnd *SCpnt, u16 *addr, fc_channel *fc, fcp_cmnd *fcmd)
 315 {
 316         PLND(("encode addr %d %d %d\n", SCpnt->channel, SCpnt->target, SCpnt->cmnd[1] & 0xe0))
 317         /* We don't support LUNs - neither does SSA :) */
 318         if (SCpnt->cmnd[1] & 0xe0) return -EINVAL;
 319         if (!SCpnt->channel) {
 320                 if (SCpnt->target) return -EINVAL;
 321                 memset (addr, 0, 4 * sizeof(u16));
 322         } else {
 323                 addr[0] = 1;
 324                 addr[1] = SCpnt->channel - 1;
 325                 addr[2] = SCpnt->target;
 326                 addr[3] = 0;
 327         }
 328         /* We're Point-to-Point, so target it to the default DID */
 329         fcmd->did = fc->did;
 330         PLND(("trying %04x%04x%04x%04x\n", addr[0], addr[1], addr[2], addr[3]))
 331         return 0;
 332 }
 333
 334 #ifdef MODULE
 335
 336 Scsi_Host_Template driver_template = PLUTO;
 337
 338 #include "scsi_module.c"
 339
 340 EXPORT_NO_SYMBOLS;
 341 #endif /* MODULE */