drivers/char/mbcs.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (c) 2005 Silicon Graphics, Inc.  All rights reserved.
   7  */
   8
   9 /*
  10  *      MOATB Core Services driver.
  11  */
  12
  13 #include <linux/interrupt.h>
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/types.h>
  17 #include <linux/ioport.h>
  18 #include <linux/kernel.h>
  19 #include <linux/notifier.h>
  20 #include <linux/reboot.h>
  21 #include <linux/init.h>
  22 #include <linux/fs.h>
  23 #include <linux/delay.h>
  24 #include <linux/device.h>
  25 #include <linux/mm.h>
  26 #include <linux/uio.h>
  27 #include <linux/mutex.h>
  28 #include <linux/slab.h>
  29 #include <asm/io.h>
  30 #include <asm/uaccess.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/sn/addrs.h>
  33 #include <asm/sn/intr.h>
  34 #include <asm/sn/tiocx.h>
  35 #include "mbcs.h"
  36
  37 #define MBCS_DEBUG 0
  38 #if MBCS_DEBUG
  39 #define DBG(fmt...)    printk(KERN_ALERT fmt)
  40 #else
  41 #define DBG(fmt...)
  42 #endif
  43 static DEFINE_MUTEX(mbcs_mutex);
  44 static int mbcs_major;
  45
  46 static LIST_HEAD(soft_list);
  47
  48 /*
  49  * file operations
  50  */
  51 static const struct file_operations mbcs_ops = {
  52         .open = mbcs_open,
  53         .llseek = mbcs_sram_llseek,
  54         .read = mbcs_sram_read,
  55         .write = mbcs_sram_write,
  56         .mmap = mbcs_gscr_mmap,
  57 };
  58
  59 struct mbcs_callback_arg {
  60         int minor;
  61         struct cx_dev *cx_dev;
  62 };
  63
  64 static inline void mbcs_getdma_init(struct getdma *gdma)
  65 {
  66         memset(gdma, 0, sizeof(struct getdma));
  67         gdma->DoneIntEnable = 1;
  68 }
  69
  70 static inline void mbcs_putdma_init(struct putdma *pdma)
  71 {
  72         memset(pdma, 0, sizeof(struct putdma));
  73         pdma->DoneIntEnable = 1;
  74 }
  75
  76 static inline void mbcs_algo_init(struct algoblock *algo_soft)
  77 {
  78         memset(algo_soft, 0, sizeof(struct algoblock));
  79 }
  80
  81 static inline void mbcs_getdma_set(void *mmr,
  82                        uint64_t hostAddr,
  83                        uint64_t localAddr,
  84                        uint64_t localRamSel,
  85                        uint64_t numPkts,
  86                        uint64_t amoEnable,
  87                        uint64_t intrEnable,
  88                        uint64_t peerIO,
  89                        uint64_t amoHostDest,
  90                        uint64_t amoModType, uint64_t intrHostDest,
  91                        uint64_t intrVector)
  92 {
  93         union dma_control rdma_control;
  94         union dma_amo_dest amo_dest;
  95         union intr_dest intr_dest;
  96         union dma_localaddr local_addr;
  97         union dma_hostaddr host_addr;
  98
  99         rdma_control.dma_control_reg = 0;
 100         amo_dest.dma_amo_dest_reg = 0;
 101         intr_dest.intr_dest_reg = 0;
 102         local_addr.dma_localaddr_reg = 0;
 103         host_addr.dma_hostaddr_reg = 0;
 104
 105         host_addr.dma_sys_addr = hostAddr;
 106         MBCS_MMR_SET(mmr, MBCS_RD_DMA_SYS_ADDR, host_addr.dma_hostaddr_reg);
 107
 108         local_addr.dma_ram_addr = localAddr;
 109         local_addr.dma_ram_sel = localRamSel;
 110         MBCS_MMR_SET(mmr, MBCS_RD_DMA_LOC_ADDR, local_addr.dma_localaddr_reg);
 111
 112         rdma_control.dma_op_length = numPkts;
 113         rdma_control.done_amo_en = amoEnable;
 114         rdma_control.done_int_en = intrEnable;
 115         rdma_control.pio_mem_n = peerIO;
 116         MBCS_MMR_SET(mmr, MBCS_RD_DMA_CTRL, rdma_control.dma_control_reg);
 117
 118         amo_dest.dma_amo_sys_addr = amoHostDest;
 119         amo_dest.dma_amo_mod_type = amoModType;
 120         MBCS_MMR_SET(mmr, MBCS_RD_DMA_AMO_DEST, amo_dest.dma_amo_dest_reg);
 121
 122         intr_dest.address = intrHostDest;
 123         intr_dest.int_vector = intrVector;
 124         MBCS_MMR_SET(mmr, MBCS_RD_DMA_INT_DEST, intr_dest.intr_dest_reg);
 125
 126 }
 127
 128 static inline void mbcs_putdma_set(void *mmr,
 129                        uint64_t hostAddr,
 130                        uint64_t localAddr,
 131                        uint64_t localRamSel,
 132                        uint64_t numPkts,
 133                        uint64_t amoEnable,
 134                        uint64_t intrEnable,
 135                        uint64_t peerIO,
 136                        uint64_t amoHostDest,
 137                        uint64_t amoModType,
 138                        uint64_t intrHostDest, uint64_t intrVector)
 139 {
 140         union dma_control wdma_control;
 141         union dma_amo_dest amo_dest;
 142         union intr_dest intr_dest;
 143         union dma_localaddr local_addr;
 144         union dma_hostaddr host_addr;
 145
 146         wdma_control.dma_control_reg = 0;
 147         amo_dest.dma_amo_dest_reg = 0;
 148         intr_dest.intr_dest_reg = 0;
 149         local_addr.dma_localaddr_reg = 0;
 150         host_addr.dma_hostaddr_reg = 0;
 151
 152         host_addr.dma_sys_addr = hostAddr;
 153         MBCS_MMR_SET(mmr, MBCS_WR_DMA_SYS_ADDR, host_addr.dma_hostaddr_reg);
 154
 155         local_addr.dma_ram_addr = localAddr;
 156         local_addr.dma_ram_sel = localRamSel;
 157         MBCS_MMR_SET(mmr, MBCS_WR_DMA_LOC_ADDR, local_addr.dma_localaddr_reg);
 158
 159         wdma_control.dma_op_length = numPkts;
 160         wdma_control.done_amo_en = amoEnable;
 161         wdma_control.done_int_en = intrEnable;
 162         wdma_control.pio_mem_n = peerIO;
 163         MBCS_MMR_SET(mmr, MBCS_WR_DMA_CTRL, wdma_control.dma_control_reg);
 164
 165         amo_dest.dma_amo_sys_addr = amoHostDest;
 166         amo_dest.dma_amo_mod_type = amoModType;
 167         MBCS_MMR_SET(mmr, MBCS_WR_DMA_AMO_DEST, amo_dest.dma_amo_dest_reg);
 168
 169         intr_dest.address = intrHostDest;
 170         intr_dest.int_vector = intrVector;
 171         MBCS_MMR_SET(mmr, MBCS_WR_DMA_INT_DEST, intr_dest.intr_dest_reg);
 172
 173 }
 174
 175 static inline void mbcs_algo_set(void *mmr,
 176                      uint64_t amoHostDest,
 177                      uint64_t amoModType,
 178                      uint64_t intrHostDest,
 179                      uint64_t intrVector, uint64_t algoStepCount)
 180 {
 181         union dma_amo_dest amo_dest;
 182         union intr_dest intr_dest;
 183         union algo_step step;
 184
 185         step.algo_step_reg = 0;
 186         intr_dest.intr_dest_reg = 0;
 187         amo_dest.dma_amo_dest_reg = 0;
 188
 189         amo_dest.dma_amo_sys_addr = amoHostDest;
 190         amo_dest.dma_amo_mod_type = amoModType;
 191         MBCS_MMR_SET(mmr, MBCS_ALG_AMO_DEST, amo_dest.dma_amo_dest_reg);
 192
 193         intr_dest.address = intrHostDest;
 194         intr_dest.int_vector = intrVector;
 195         MBCS_MMR_SET(mmr, MBCS_ALG_INT_DEST, intr_dest.intr_dest_reg);
 196
 197         step.alg_step_cnt = algoStepCount;
 198         MBCS_MMR_SET(mmr, MBCS_ALG_STEP, step.algo_step_reg);
 199 }
 200
 201 static inline int mbcs_getdma_start(struct mbcs_soft *soft)
 202 {
 203         void *mmr_base;
 204         struct getdma *gdma;
 205         uint64_t numPkts;
 206         union cm_control cm_control;
 207
 208         mmr_base = soft->mmr_base;
 209         gdma = &soft->getdma;
 210
 211         /* check that host address got setup */
 212         if (!gdma->hostAddr)
 213                 return -1;
 214
 215         numPkts =
 216             (gdma->bytes + (MBCS_CACHELINE_SIZE - 1)) / MBCS_CACHELINE_SIZE;
 217
 218         /* program engine */
 219         mbcs_getdma_set(mmr_base, tiocx_dma_addr(gdma->hostAddr),
 220                    gdma->localAddr,
 221                    (gdma->localAddr < MB2) ? 0 :
 222                    (gdma->localAddr < MB4) ? 1 :
 223                    (gdma->localAddr < MB6) ? 2 : 3,
 224                    numPkts,
 225                    gdma->DoneAmoEnable,
 226                    gdma->DoneIntEnable,
 227                    gdma->peerIO,
 228                    gdma->amoHostDest,
 229                    gdma->amoModType,
 230                    gdma->intrHostDest, gdma->intrVector);
 231
 232         /* start engine */
 233         cm_control.cm_control_reg = MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
 234         cm_control.rd_dma_go = 1;
 235         MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL, cm_control.cm_control_reg);
 236
 237         return 0;
 238
 239 }
 240
 241 static inline int mbcs_putdma_start(struct mbcs_soft *soft)
 242 {
 243         void *mmr_base;
 244         struct putdma *pdma;
 245         uint64_t numPkts;
 246         union cm_control cm_control;
 247
 248         mmr_base = soft->mmr_base;
 249         pdma = &soft->putdma;
 250
 251         /* check that host address got setup */
 252         if (!pdma->hostAddr)
 253                 return -1;
 254
 255         numPkts =
 256             (pdma->bytes + (MBCS_CACHELINE_SIZE - 1)) / MBCS_CACHELINE_SIZE;
 257
 258         /* program engine */
 259         mbcs_putdma_set(mmr_base, tiocx_dma_addr(pdma->hostAddr),
 260                    pdma->localAddr,
 261                    (pdma->localAddr < MB2) ? 0 :
 262                    (pdma->localAddr < MB4) ? 1 :
 263                    (pdma->localAddr < MB6) ? 2 : 3,
 264                    numPkts,
 265                    pdma->DoneAmoEnable,
 266                    pdma->DoneIntEnable,
 267                    pdma->peerIO,
 268                    pdma->amoHostDest,
 269                    pdma->amoModType,
 270                    pdma->intrHostDest, pdma->intrVector);
 271
 272         /* start engine */
 273         cm_control.cm_control_reg = MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
 274         cm_control.wr_dma_go = 1;
 275         MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL, cm_control.cm_control_reg);
 276
 277         return 0;
 278
 279 }
 280
 281 static inline int mbcs_algo_start(struct mbcs_soft *soft)
 282 {
 283         struct algoblock *algo_soft = &soft->algo;
 284         void *mmr_base = soft->mmr_base;
 285         union cm_control cm_control;
 286
 287         if (mutex_lock_interruptible(&soft->algolock))
 288                 return -ERESTARTSYS;
 289
 290         atomic_set(&soft->algo_done, 0);
 291
 292         mbcs_algo_set(mmr_base,
 293                  algo_soft->amoHostDest,
 294                  algo_soft->amoModType,
 295                  algo_soft->intrHostDest,
 296                  algo_soft->intrVector, algo_soft->algoStepCount);
 297
 298         /* start algorithm */
 299         cm_control.cm_control_reg = MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
 300         cm_control.alg_done_int_en = 1;
 301         cm_control.alg_go = 1;
 302         MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL, cm_control.cm_control_reg);
 303
 304         mutex_unlock(&soft->algolock);
 305
 306         return 0;
 307 }
 308
 309 static inline ssize_t
 310 do_mbcs_sram_dmawrite(struct mbcs_soft *soft, uint64_t hostAddr,
 311                       size_t len, loff_t * off)
 312 {
 313         int rv = 0;
 314
 315         if (mutex_lock_interruptible(&soft->dmawritelock))
 316                 return -ERESTARTSYS;
 317
 318         atomic_set(&soft->dmawrite_done, 0);
 319
 320         soft->putdma.hostAddr = hostAddr;
 321         soft->putdma.localAddr = *off;
 322         soft->putdma.bytes = len;
 323
 324         if (mbcs_putdma_start(soft) < 0) {
 325                 DBG(KERN_ALERT "do_mbcs_sram_dmawrite: "
 326                                         "mbcs_putdma_start failed\n");
 327                 rv = -EAGAIN;
 328                 goto dmawrite_exit;
 329         }
 330
 331         if (wait_event_interruptible(soft->dmawrite_queue,
 332                                         atomic_read(&soft->dmawrite_done))) {
 333                 rv = -ERESTARTSYS;
 334                 goto dmawrite_exit;
 335         }
 336
 337         rv = len;
 338         *off += len;
 339
 340 dmawrite_exit:
 341         mutex_unlock(&soft->dmawritelock);
 342
 343         return rv;
 344 }
 345
 346 static inline ssize_t
 347 do_mbcs_sram_dmaread(struct mbcs_soft *soft, uint64_t hostAddr,
 348                      size_t len, loff_t * off)
 349 {
 350         int rv = 0;
 351
 352         if (mutex_lock_interruptible(&soft->dmareadlock))
 353                 return -ERESTARTSYS;
 354
 355         atomic_set(&soft->dmawrite_done, 0);
 356
 357         soft->getdma.hostAddr = hostAddr;
 358         soft->getdma.localAddr = *off;
 359         soft->getdma.bytes = len;
 360
 361         if (mbcs_getdma_start(soft) < 0) {
 362                 DBG(KERN_ALERT "mbcs_strategy: mbcs_getdma_start failed\n");
 363                 rv = -EAGAIN;
 364                 goto dmaread_exit;
 365         }
 366
 367         if (wait_event_interruptible(soft->dmaread_queue,
 368                                         atomic_read(&soft->dmaread_done))) {
 369                 rv = -ERESTARTSYS;
 370                 goto dmaread_exit;
 371         }
 372
 373         rv = len;
 374         *off += len;
 375
 376 dmaread_exit:
 377         mutex_unlock(&soft->dmareadlock);
 378
 379         return rv;
 380 }
 381
 382 static int mbcs_open(struct inode *ip, struct file *fp)
 383 {
 384         struct mbcs_soft *soft;
 385         int minor;
 386
 387         mutex_lock(&mbcs_mutex);
 388         minor = iminor(ip);
 389
 390         /* Nothing protects access to this list... */
 391         list_for_each_entry(soft, &soft_list, list) {
 392                 if (soft->nasid == minor) {
 393                         fp->private_data = soft->cxdev;
 394                         mutex_unlock(&mbcs_mutex);
 395                         return 0;
 396                 }
 397         }
 398
 399         mutex_unlock(&mbcs_mutex);
 400         return -ENODEV;
 401 }
 402
 403 static ssize_t mbcs_sram_read(struct file * fp, char __user *buf, size_t len, loff_t * off)
 404 {
 405         struct cx_dev *cx_dev = fp->private_data;
 406         struct mbcs_soft *soft = cx_dev->soft;
 407         uint64_t hostAddr;
 408         int rv = 0;
 409
 410         hostAddr = __get_dma_pages(GFP_KERNEL, get_order(len));
 411         if (hostAddr == 0)
 412                 return -ENOMEM;
 413
 414         rv = do_mbcs_sram_dmawrite(soft, hostAddr, len, off);
 415         if (rv < 0)
 416                 goto exit;
 417
 418         if (copy_to_user(buf, (void *)hostAddr, len))
 419                 rv = -EFAULT;
 420
 421       exit:
 422         free_pages(hostAddr, get_order(len));
 423
 424         return rv;
 425 }
 426
 427 static ssize_t
 428 mbcs_sram_write(struct file * fp, const char __user *buf, size_t len, loff_t * off)
 429 {
 430         struct cx_dev *cx_dev = fp->private_data;
 431         struct mbcs_soft *soft = cx_dev->soft;
 432         uint64_t hostAddr;
 433         int rv = 0;
 434
 435         hostAddr = __get_dma_pages(GFP_KERNEL, get_order(len));
 436         if (hostAddr == 0)
 437                 return -ENOMEM;
 438
 439         if (copy_from_user((void *)hostAddr, buf, len)) {
 440                 rv = -EFAULT;
 441                 goto exit;
 442         }
 443
 444         rv = do_mbcs_sram_dmaread(soft, hostAddr, len, off);
 445
 446       exit:
 447         free_pages(hostAddr, get_order(len));
 448
 449         return rv;
 450 }
 451
 452 static loff_t mbcs_sram_llseek(struct file * filp, loff_t off, int whence)
 453 {
 454         loff_t newpos;
 455
 456         switch (whence) {
 457         case SEEK_SET:
 458                 newpos = off;
 459                 break;
 460
 461         case SEEK_CUR:
 462                 newpos = filp->f_pos + off;
 463                 break;
 464
 465         case SEEK_END:
 466                 newpos = MBCS_SRAM_SIZE + off;
 467                 break;
 468
 469         default:                /* can't happen */
 470                 return -EINVAL;
 471         }
 472
 473         if (newpos < 0)
 474                 return -EINVAL;
 475
 476         filp->f_pos = newpos;
 477
 478         return newpos;
 479 }
 480
 481 static uint64_t mbcs_pioaddr(struct mbcs_soft *soft, uint64_t offset)
 482 {
 483         uint64_t mmr_base;
 484
 485         mmr_base = (uint64_t) (soft->mmr_base + offset);
 486
 487         return mmr_base;
 488 }
 489
 490 static void mbcs_debug_pioaddr_set(struct mbcs_soft *soft)
 491 {
 492         soft->debug_addr = mbcs_pioaddr(soft, MBCS_DEBUG_START);
 493 }
 494
 495 static void mbcs_gscr_pioaddr_set(struct mbcs_soft *soft)
 496 {
 497         soft->gscr_addr = mbcs_pioaddr(soft, MBCS_GSCR_START);
 498 }
 499
 500 static int mbcs_gscr_mmap(struct file *fp, struct vm_area_struct *vma)
 501 {
 502         struct cx_dev *cx_dev = fp->private_data;
 503         struct mbcs_soft *soft = cx_dev->soft;
 504
 505         if (vma->vm_pgoff != 0)
 506                 return -EINVAL;
 507
 508         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 509
 510         /* Remap-pfn-range will mark the range VM_IO */
 511         if (remap_pfn_range(vma,
 512                             vma->vm_start,
 513                             __pa(soft->gscr_addr) >> PAGE_SHIFT,
 514                             PAGE_SIZE,
 515                             vma->vm_page_prot))
 516                 return -EAGAIN;
 517
 518         return 0;
 519 }
 520
 521 /**
 522  * mbcs_completion_intr_handler - Primary completion handler.
 523  * @irq: irq
 524  * @arg: soft struct for device
 525  *
 526  */
 527 static irqreturn_t
 528 mbcs_completion_intr_handler(int irq, void *arg)
 529 {
 530         struct mbcs_soft *soft = (struct mbcs_soft *)arg;
 531         void *mmr_base;
 532         union cm_status cm_status;
 533         union cm_control cm_control;
 534
 535         mmr_base = soft->mmr_base;
 536         cm_status.cm_status_reg = MBCS_MMR_GET(mmr_base, MBCS_CM_STATUS);
 537
 538         if (cm_status.rd_dma_done) {
 539                 /* stop dma-read engine, clear status */
 540                 cm_control.cm_control_reg =
 541                     MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
 542                 cm_control.rd_dma_clr = 1;
 543                 MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL,
 544                              cm_control.cm_control_reg);
 545                 atomic_set(&soft->dmaread_done, 1);
 546                 wake_up(&soft->dmaread_queue);
 547         }
 548         if (cm_status.wr_dma_done) {
 549                 /* stop dma-write engine, clear status */
 550                 cm_control.cm_control_reg =
 551                     MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
 552                 cm_control.wr_dma_clr = 1;
 553                 MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL,
 554                              cm_control.cm_control_reg);
 555                 atomic_set(&soft->dmawrite_done, 1);
 556                 wake_up(&soft->dmawrite_queue);
 557         }
 558         if (cm_status.alg_done) {
 559                 /* clear status */
 560                 cm_control.cm_control_reg =
 561                     MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
 562                 cm_control.alg_done_clr = 1;
 563                 MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL,
 564                              cm_control.cm_control_reg);
 565                 atomic_set(&soft->algo_done, 1);
 566                 wake_up(&soft->algo_queue);
 567         }
 568
 569         return IRQ_HANDLED;
 570 }
 571
 572 /**
 573  * mbcs_intr_alloc - Allocate interrupts.
 574  * @dev: device pointer
 575  *
 576  */
 577 static int mbcs_intr_alloc(struct cx_dev *dev)
 578 {
 579         struct sn_irq_info *sn_irq;
 580         struct mbcs_soft *soft;
 581         struct getdma *getdma;
 582         struct putdma *putdma;
 583         struct algoblock *algo;
 584
 585         soft = dev->soft;
 586         getdma = &soft->getdma;
 587         putdma = &soft->putdma;
 588         algo = &soft->algo;
 589
 590         soft->get_sn_irq = NULL;
 591         soft->put_sn_irq = NULL;
 592         soft->algo_sn_irq = NULL;
 593
 594         sn_irq = tiocx_irq_alloc(dev->cx_id.nasid, TIOCX_CORELET, -1, -1, -1);
 595         if (sn_irq == NULL)
 596                 return -EAGAIN;
 597         soft->get_sn_irq = sn_irq;
 598         getdma->intrHostDest = sn_irq->irq_xtalkaddr;
 599         getdma->intrVector = sn_irq->irq_irq;
 600         if (request_irq(sn_irq->irq_irq,
 601                         (void *)mbcs_completion_intr_handler, IRQF_SHARED,
 602                         "MBCS get intr", (void *)soft)) {
 603                 tiocx_irq_free(soft->get_sn_irq);
 604                 return -EAGAIN;
 605         }
 606
 607         sn_irq = tiocx_irq_alloc(dev->cx_id.nasid, TIOCX_CORELET, -1, -1, -1);
 608         if (sn_irq == NULL) {
 609                 free_irq(soft->get_sn_irq->irq_irq, soft);
 610                 tiocx_irq_free(soft->get_sn_irq);
 611                 return -EAGAIN;
 612         }
 613         soft->put_sn_irq = sn_irq;
 614         putdma->intrHostDest = sn_irq->irq_xtalkaddr;
 615         putdma->intrVector = sn_irq->irq_irq;
 616         if (request_irq(sn_irq->irq_irq,
 617                         (void *)mbcs_completion_intr_handler, IRQF_SHARED,
 618                         "MBCS put intr", (void *)soft)) {
 619                 tiocx_irq_free(soft->put_sn_irq);
 620                 free_irq(soft->get_sn_irq->irq_irq, soft);
 621                 tiocx_irq_free(soft->get_sn_irq);
 622                 return -EAGAIN;
 623         }
 624
 625         sn_irq = tiocx_irq_alloc(dev->cx_id.nasid, TIOCX_CORELET, -1, -1, -1);
 626         if (sn_irq == NULL) {
 627                 free_irq(soft->put_sn_irq->irq_irq, soft);
 628                 tiocx_irq_free(soft->put_sn_irq);
 629                 free_irq(soft->get_sn_irq->irq_irq, soft);
 630                 tiocx_irq_free(soft->get_sn_irq);
 631                 return -EAGAIN;
 632         }
 633         soft->algo_sn_irq = sn_irq;
 634         algo->intrHostDest = sn_irq->irq_xtalkaddr;
 635         algo->intrVector = sn_irq->irq_irq;
 636         if (request_irq(sn_irq->irq_irq,
 637                         (void *)mbcs_completion_intr_handler, IRQF_SHARED,
 638                         "MBCS algo intr", (void *)soft)) {
 639                 tiocx_irq_free(soft->algo_sn_irq);
 640                 free_irq(soft->put_sn_irq->irq_irq, soft);
 641                 tiocx_irq_free(soft->put_sn_irq);
 642                 free_irq(soft->get_sn_irq->irq_irq, soft);
 643                 tiocx_irq_free(soft->get_sn_irq);
 644                 return -EAGAIN;
 645         }
 646
 647         return 0;
 648 }
 649
 650 /**
 651  * mbcs_intr_dealloc - Remove interrupts.
 652  * @dev: device pointer
 653  *
 654  */
 655 static void mbcs_intr_dealloc(struct cx_dev *dev)
 656 {
 657         struct mbcs_soft *soft;
 658
 659         soft = dev->soft;
 660
 661         free_irq(soft->get_sn_irq->irq_irq, soft);
 662         tiocx_irq_free(soft->get_sn_irq);
 663         free_irq(soft->put_sn_irq->irq_irq, soft);
 664         tiocx_irq_free(soft->put_sn_irq);
 665         free_irq(soft->algo_sn_irq->irq_irq, soft);
 666         tiocx_irq_free(soft->algo_sn_irq);
 667 }
 668
 669 static inline int mbcs_hw_init(struct mbcs_soft *soft)
 670 {
 671         void *mmr_base = soft->mmr_base;
 672         union cm_control cm_control;
 673         union cm_req_timeout cm_req_timeout;
 674         uint64_t err_stat;
 675
 676         cm_req_timeout.cm_req_timeout_reg =
 677             MBCS_MMR_GET(mmr_base, MBCS_CM_REQ_TOUT);
 678
 679         cm_req_timeout.time_out = MBCS_CM_CONTROL_REQ_TOUT_MASK;
 680         MBCS_MMR_SET(mmr_base, MBCS_CM_REQ_TOUT,
 681                      cm_req_timeout.cm_req_timeout_reg);
 682
 683         mbcs_gscr_pioaddr_set(soft);
 684         mbcs_debug_pioaddr_set(soft);
 685
 686         /* clear errors */
 687         err_stat = MBCS_MMR_GET(mmr_base, MBCS_CM_ERR_STAT);
 688         MBCS_MMR_SET(mmr_base, MBCS_CM_CLR_ERR_STAT, err_stat);
 689         MBCS_MMR_ZERO(mmr_base, MBCS_CM_ERROR_DETAIL1);
 690
 691         /* enable interrupts */
 692         /* turn off 2^23 (INT_EN_PIO_REQ_ADDR_INV) */
 693         MBCS_MMR_SET(mmr_base, MBCS_CM_ERR_INT_EN, 0x3ffffff7e00ffUL);
 694
 695         /* arm status regs and clear engines */
 696         cm_control.cm_control_reg = MBCS_MMR_GET(mmr_base, MBCS_CM_CONTROL);
 697         cm_control.rearm_stat_regs = 1;
 698         cm_control.alg_clr = 1;
 699         cm_control.wr_dma_clr = 1;
 700         cm_control.rd_dma_clr = 1;
 701
 702         MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL, cm_control.cm_control_reg);
 703
 704         return 0;
 705 }
 706
 707 static ssize_t show_algo(struct device *dev, struct device_attribute *attr, char *buf)
 708 {
 709         struct cx_dev *cx_dev = to_cx_dev(dev);
 710         struct mbcs_soft *soft = cx_dev->soft;
 711         uint64_t debug0;
 712
 713         /*
 714          * By convention, the first debug register contains the
 715          * algorithm number and revision.
 716          */
 717         debug0 = *(uint64_t *) soft->debug_addr;
 718
 719         return sprintf(buf, "0x%x 0x%x\n",
 720                        upper_32_bits(debug0), lower_32_bits(debug0));
 721 }
 722
 723 static ssize_t store_algo(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 724 {
 725         int n;
 726         struct cx_dev *cx_dev = to_cx_dev(dev);
 727         struct mbcs_soft *soft = cx_dev->soft;
 728
 729         if (count <= 0)
 730                 return 0;
 731
 732         n = simple_strtoul(buf, NULL, 0);
 733
 734         if (n == 1) {
 735                 mbcs_algo_start(soft);
 736                 if (wait_event_interruptible(soft->algo_queue,
 737                                         atomic_read(&soft->algo_done)))
 738                         return -ERESTARTSYS;
 739         }
 740
 741         return count;
 742 }
 743
 744 DEVICE_ATTR(algo, 0644, show_algo, store_algo);
 745
 746 /**
 747  * mbcs_probe - Initialize for device
 748  * @dev: device pointer
 749  * @device_id: id table pointer
 750  *
 751  */
 752 static int mbcs_probe(struct cx_dev *dev, const struct cx_device_id *id)
 753 {
 754         struct mbcs_soft *soft;
 755
 756         dev->soft = NULL;
 757
 758         soft = kzalloc(sizeof(struct mbcs_soft), GFP_KERNEL);
 759         if (soft == NULL)
 760                 return -ENOMEM;
 761
 762         soft->nasid = dev->cx_id.nasid;
 763         list_add(&soft->list, &soft_list);
 764         soft->mmr_base = (void *)tiocx_swin_base(dev->cx_id.nasid);
 765         dev->soft = soft;
 766         soft->cxdev = dev;
 767
 768         init_waitqueue_head(&soft->dmawrite_queue);
 769         init_waitqueue_head(&soft->dmaread_queue);
 770         init_waitqueue_head(&soft->algo_queue);
 771
 772         mutex_init(&soft->dmawritelock);
 773         mutex_init(&soft->dmareadlock);
 774         mutex_init(&soft->algolock);
 775
 776         mbcs_getdma_init(&soft->getdma);
 777         mbcs_putdma_init(&soft->putdma);
 778         mbcs_algo_init(&soft->algo);
 779
 780         mbcs_hw_init(soft);
 781
 782         /* Allocate interrupts */
 783         mbcs_intr_alloc(dev);
 784
 785         device_create_file(&dev->dev, &dev_attr_algo);
 786
 787         return 0;
 788 }
 789
 790 static int mbcs_remove(struct cx_dev *dev)
 791 {
 792         if (dev->soft) {
 793                 mbcs_intr_dealloc(dev);
 794                 kfree(dev->soft);
 795         }
 796
 797         device_remove_file(&dev->dev, &dev_attr_algo);
 798
 799         return 0;
 800 }
 801
 802 static const struct cx_device_id mbcs_id_table[] = {
 803         {
 804          .part_num = MBCS_PART_NUM,
 805          .mfg_num = MBCS_MFG_NUM,
 806          },
 807         {
 808          .part_num = MBCS_PART_NUM_ALG0,
 809          .mfg_num = MBCS_MFG_NUM,
 810          },
 811         {0, 0}
 812 };
 813
 814 MODULE_DEVICE_TABLE(cx, mbcs_id_table);
 815
 816 static struct cx_drv mbcs_driver = {
 817         .name = DEVICE_NAME,
 818         .id_table = mbcs_id_table,
 819         .probe = mbcs_probe,
 820         .remove = mbcs_remove,
 821 };
 822
 823 static void __exit mbcs_exit(void)
 824 {
 825         unregister_chrdev(mbcs_major, DEVICE_NAME);
 826         cx_driver_unregister(&mbcs_driver);
 827 }
 828
 829 static int __init mbcs_init(void)
 830 {
 831         int rv;
 832
 833         if (!ia64_platform_is("sn2"))
 834                 return -ENODEV;
 835
 836         // Put driver into chrdevs[].  Get major number.
 837         rv = register_chrdev(mbcs_major, DEVICE_NAME, &mbcs_ops);
 838         if (rv < 0) {
 839                 DBG(KERN_ALERT "mbcs_init: can't get major number. %d\n", rv);
 840                 return rv;
 841         }
 842         mbcs_major = rv;
 843
 844         return cx_driver_register(&mbcs_driver);
 845 }
 846
 847 module_init(mbcs_init);
 848 module_exit(mbcs_exit);
 849
 850 MODULE_AUTHOR("Bruce Losure <blosure@sgi.com>");
 851 MODULE_DESCRIPTION("Driver for MOATB Core Services");
 852 MODULE_LICENSE("GPL");