drivers/scsi/aacraid/sa.c

   1 /*
   2  *      Adaptec AAC series RAID controller driver
   3  *      (c) Copyright 2001 Red Hat Inc. <alan@redhat.com>
   4  *
   5  * based on the old aacraid driver that is..
   6  * Adaptec aacraid device driver for Linux.
   7  *
   8  * Copyright (c) 2000 Adaptec, Inc. (aacraid@adaptec.com)
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2, or (at your option)
  13  * any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; see the file COPYING.  If not, write to
  22  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  * Module Name:
  25  *  sa.c
  26  *
  27  * Abstract: Drawbridge specific support functions
  28  *
  29  */
  30
  31 #include <linux/kernel.h>
  32 #include <linux/init.h>
  33 #include <linux/types.h>
  34 #include <linux/sched.h>
  35 #include <linux/pci.h>
  36 #include <linux/spinlock.h>
  37 #include <linux/slab.h>
  38 #include <linux/blkdev.h>
  39 #include <linux/delay.h>
  40 #include <linux/completion.h>
  41 #include <linux/time.h>
  42 #include <linux/interrupt.h>
  43 #include <asm/semaphore.h>
  44
  45 #include <scsi/scsi_host.h>
  46
  47 #include "aacraid.h"
  48
  49 static irqreturn_t aac_sa_intr(int irq, void *dev_id, struct pt_regs *regs)
  50 {
  51         struct aac_dev *dev = dev_id;
  52         unsigned short intstat, mask;
  53
  54         intstat = sa_readw(dev, DoorbellReg_p);
  55         /*
  56          *      Read mask and invert because drawbridge is reversed.
  57          *      This allows us to only service interrupts that have been enabled.
  58          */
  59         mask = ~(sa_readw(dev, SaDbCSR.PRISETIRQMASK));
  60
  61         /* Check to see if this is our interrupt.  If it isn't just return */
  62
  63         if (intstat & mask) {
  64                 if (intstat & PrintfReady) {
  65                         aac_printf(dev, sa_readl(dev, Mailbox5));
  66                         sa_writew(dev, DoorbellClrReg_p, PrintfReady); /* clear PrintfReady */
  67                         sa_writew(dev, DoorbellReg_s, PrintfDone);
  68                 } else if (intstat & DOORBELL_1) {      // dev -> Host Normal Command Ready
  69                         aac_command_normal(&dev->queues->queue[HostNormCmdQueue]);
  70                         sa_writew(dev, DoorbellClrReg_p, DOORBELL_1);
  71                 } else if (intstat & DOORBELL_2) {      // dev -> Host Normal Response Ready
  72                         aac_response_normal(&dev->queues->queue[HostNormRespQueue]);
  73                         sa_writew(dev, DoorbellClrReg_p, DOORBELL_2);
  74                 } else if (intstat & DOORBELL_3) {      // dev -> Host Normal Command Not Full
  75                         sa_writew(dev, DoorbellClrReg_p, DOORBELL_3);
  76                 } else if (intstat & DOORBELL_4) {      // dev -> Host Normal Response Not Full
  77                         sa_writew(dev, DoorbellClrReg_p, DOORBELL_4);
  78                 }
  79                 return IRQ_HANDLED;
  80         }
  81         return IRQ_NONE;
  82 }
  83
  84 /**
  85  *      aac_sa_notify_adapter           -       handle adapter notification
  86  *      @dev:   Adapter that notification is for
  87  *      @event: Event to notidy
  88  *
  89  *      Notify the adapter of an event
  90  */
  91
  92 void aac_sa_notify_adapter(struct aac_dev *dev, u32 event)
  93 {
  94         switch (event) {
  95
  96         case AdapNormCmdQue:
  97                 sa_writew(dev, DoorbellReg_s,DOORBELL_1);
  98                 break;
  99         case HostNormRespNotFull:
 100                 sa_writew(dev, DoorbellReg_s,DOORBELL_4);
 101                 break;
 102         case AdapNormRespQue:
 103                 sa_writew(dev, DoorbellReg_s,DOORBELL_2);
 104                 break;
 105         case HostNormCmdNotFull:
 106                 sa_writew(dev, DoorbellReg_s,DOORBELL_3);
 107                 break;
 108         case HostShutdown:
 109                 //sa_sync_cmd(dev, HOST_CRASHING, 0, &ret);
 110                 break;
 111         case FastIo:
 112                 sa_writew(dev, DoorbellReg_s,DOORBELL_6);
 113                 break;
 114         case AdapPrintfDone:
 115                 sa_writew(dev, DoorbellReg_s,DOORBELL_5);
 116                 break;
 117         default:
 118                 BUG();
 119                 break;
 120         }
 121 }
 122
 123
 124 /**
 125  *      sa_sync_cmd     -       send a command and wait
 126  *      @dev: Adapter
 127  *      @command: Command to execute
 128  *      @p1: first parameter
 129  *      @ret: adapter status
 130  *
 131  *      This routine will send a synchronous command to the adapter and wait
 132  *      for its completion.
 133  */
 134
 135 static int sa_sync_cmd(struct aac_dev *dev, u32 command, u32 p1, u32 *ret)
 136 {
 137         unsigned long start;
 138         int ok;
 139         /*
 140          *      Write the Command into Mailbox 0
 141          */
 142         sa_writel(dev, Mailbox0, command);
 143         /*
 144          *      Write the parameters into Mailboxes 1 - 4
 145          */
 146         sa_writel(dev, Mailbox1, p1);
 147         sa_writel(dev, Mailbox2, 0);
 148         sa_writel(dev, Mailbox3, 0);
 149         sa_writel(dev, Mailbox4, 0);
 150         /*
 151          *      Clear the synch command doorbell to start on a clean slate.
 152          */
 153         sa_writew(dev, DoorbellClrReg_p, DOORBELL_0);
 154         /*
 155          *      Signal that there is a new synch command
 156          */
 157         sa_writew(dev, DoorbellReg_s, DOORBELL_0);
 158
 159         ok = 0;
 160         start = jiffies;
 161
 162         while(time_before(jiffies, start+30*HZ))
 163         {
 164                 /*
 165                  *      Delay 5uS so that the monitor gets access
 166                  */
 167                 udelay(5);
 168                 /*
 169                  *      Mon110 will set doorbell0 bit when it has
 170                  *      completed the command.
 171                  */
 172                 if(sa_readw(dev, DoorbellReg_p) & DOORBELL_0)  {
 173                         ok = 1;
 174                         break;
 175                 }
 176                 set_current_state(TASK_UNINTERRUPTIBLE);
 177                 schedule_timeout(1);
 178         }
 179
 180         if (ok != 1)
 181                 return -ETIMEDOUT;
 182         /*
 183          *      Clear the synch command doorbell.
 184          */
 185         sa_writew(dev, DoorbellClrReg_p, DOORBELL_0);
 186         /*
 187          *      Pull the synch status from Mailbox 0.
 188          */
 189         if (ret)
 190                 *ret = sa_readl(dev, Mailbox0);
 191         return 0;
 192 }
 193
 194 /**
 195  *      aac_sa_interrupt_adapter        -       interrupt an adapter
 196  *      @dev: Which adapter to enable.
 197  *
 198  *      Breakpoint an adapter.
 199  */
 200
 201 static void aac_sa_interrupt_adapter (struct aac_dev *dev)
 202 {
 203         u32 ret;
 204         sa_sync_cmd(dev, BREAKPOINT_REQUEST, 0, &ret);
 205 }
 206
 207 /**
 208  *      aac_sa_start_adapter            -       activate adapter
 209  *      @dev:   Adapter
 210  *
 211  *      Start up processing on an ARM based AAC adapter
 212  */
 213
 214 static void aac_sa_start_adapter(struct aac_dev *dev)
 215 {
 216         u32 ret;
 217         struct aac_init *init;
 218         /*
 219          * Fill in the remaining pieces of the init.
 220          */
 221         init = dev->init;
 222         init->HostElapsedSeconds = cpu_to_le32(get_seconds());
 223
 224         /*
 225          * Tell the adapter we are back and up and running so it will scan its command
 226          * queues and enable our interrupts
 227          */
 228         dev->irq_mask = (PrintfReady | DOORBELL_1 | DOORBELL_2 | DOORBELL_3 | DOORBELL_4);
 229         /*
 230          *      First clear out all interrupts.  Then enable the one's that
 231          *      we can handle.
 232          */
 233         sa_writew(dev, SaDbCSR.PRISETIRQMASK, cpu_to_le16(0xffff));
 234         sa_writew(dev, SaDbCSR.PRICLEARIRQMASK, (PrintfReady | DOORBELL_1 | DOORBELL_2 | DOORBELL_3 | DOORBELL_4));
 235         /* We can only use a 32 bit address here */
 236         sa_sync_cmd(dev, INIT_STRUCT_BASE_ADDRESS, (u32)(ulong)dev->init_pa, &ret);
 237 }
 238
 239 /**
 240  *      aac_sa_check_health
 241  *      @dev: device to check if healthy
 242  *
 243  *      Will attempt to determine if the specified adapter is alive and
 244  *      capable of handling requests, returning 0 if alive.
 245  */
 246 static int aac_sa_check_health(struct aac_dev *dev)
 247 {
 248         long status = sa_readl(dev, Mailbox7);
 249
 250         /*
 251          *      Check to see if the board failed any self tests.
 252          */
 253         if (status & SELF_TEST_FAILED)
 254                 return -1;
 255         /*
 256          *      Check to see if the board panic'd while booting.
 257          */
 258         if (status & KERNEL_PANIC)
 259                 return -2;
 260         /*
 261          *      Wait for the adapter to be up and running. Wait up to 3 minutes
 262          */
 263         if (!(status & KERNEL_UP_AND_RUNNING))
 264                 return -3;
 265         /*
 266          *      Everything is OK
 267          */
 268         return 0;
 269 }
 270
 271 /**
 272  *      aac_sa_init     -       initialize an ARM based AAC card
 273  *      @dev: device to configure
 274  *
 275  *      Allocate and set up resources for the ARM based AAC variants. The
 276  *      device_interface in the commregion will be allocated and linked
 277  *      to the comm region.
 278  */
 279
 280 int aac_sa_init(struct aac_dev *dev)
 281 {
 282         unsigned long start;
 283         unsigned long status;
 284         int instance;
 285         const char *name;
 286
 287         instance = dev->id;
 288         name     = dev->name;
 289
 290         /*
 291          *      Map in the registers from the adapter.
 292          */
 293
 294         if((dev->regs.sa = ioremap((unsigned long)dev->scsi_host_ptr->base, 8192))==NULL)
 295         {
 296                 printk(KERN_WARNING "aacraid: unable to map ARM.\n" );
 297                 goto error_iounmap;
 298         }
 299         /*
 300          *      Check to see if the board failed any self tests.
 301          */
 302         if (sa_readl(dev, Mailbox7) & SELF_TEST_FAILED) {
 303                 printk(KERN_WARNING "%s%d: adapter self-test failed.\n", name, instance);
 304                 goto error_iounmap;
 305         }
 306         /*
 307          *      Check to see if the board panic'd while booting.
 308          */
 309         if (sa_readl(dev, Mailbox7) & KERNEL_PANIC) {
 310                 printk(KERN_WARNING "%s%d: adapter kernel panic'd.\n", name, instance);
 311                 goto error_iounmap;
 312         }
 313         start = jiffies;
 314         /*
 315          *      Wait for the adapter to be up and running. Wait up to 3 minutes.
 316          */
 317         while (!(sa_readl(dev, Mailbox7) & KERNEL_UP_AND_RUNNING)) {
 318                 if (time_after(jiffies, start+180*HZ)) {
 319                         status = sa_readl(dev, Mailbox7);
 320                         printk(KERN_WARNING "%s%d: adapter kernel failed to start, init status = %lx.\n",
 321                                         name, instance, status);
 322                         goto error_iounmap;
 323                 }
 324                 set_current_state(TASK_UNINTERRUPTIBLE);
 325                 schedule_timeout(1);
 326         }
 327
 328         if (request_irq(dev->scsi_host_ptr->irq, aac_sa_intr, SA_SHIRQ|SA_INTERRUPT, "aacraid", (void *)dev ) < 0) {
 329                 printk(KERN_WARNING "%s%d: Interrupt unavailable.\n", name, instance);
 330                 goto error_iounmap;
 331         }
 332
 333         /*
 334          *      Fill in the function dispatch table.
 335          */
 336
 337         dev->a_ops.adapter_interrupt = aac_sa_interrupt_adapter;
 338         dev->a_ops.adapter_notify = aac_sa_notify_adapter;
 339         dev->a_ops.adapter_sync_cmd = sa_sync_cmd;
 340         dev->a_ops.adapter_check_health = aac_sa_check_health;
 341
 342
 343         if(aac_init_adapter(dev) == NULL)
 344                 goto error_irq;
 345
 346         /*
 347          *      Start any kernel threads needed
 348          */
 349         dev->thread_pid = kernel_thread((int (*)(void *))aac_command_thread, dev, 0);
 350         if (dev->thread_pid < 0) {
 351                 printk(KERN_ERR "aacraid: Unable to create command thread.\n");
 352                 goto error_kfree;
 353         }
 354
 355         /*
 356          *      Tell the adapter that all is configure, and it can start
 357          *      accepting requests
 358          */
 359         aac_sa_start_adapter(dev);
 360         return 0;
 361
 362
 363 error_kfree:
 364         kfree(dev->queues);
 365
 366 error_irq:
 367         free_irq(dev->scsi_host_ptr->irq, (void *)dev);
 368
 369 error_iounmap:
 370         iounmap(dev->regs.sa);
 371
 372         return -1;
 373 }
 374