1/* 2 * Timer device implementation for SGI SN platforms. 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (c) 2001-2006 Silicon Graphics, Inc. All rights reserved. 9 * 10 * This driver exports an API that should be supportable by any HPET or IA-PC 11 * multimedia timer. The code below is currently specific to the SGI Altix 12 * SHub RTC, however. 13 * 14 * 11/01/01 - jbarnes - initial revision 15 * 9/10/04 - Christoph Lameter - remove interrupt support for kernel inclusion 16 * 10/1/04 - Christoph Lameter - provide posix clock CLOCK_SGI_CYCLE 17 * 10/13/04 - Christoph Lameter, Dimitri Sivanich - provide timer interrupt 18 * support via the posix timer interface 19 */ 20 21#include <linux/types.h> 22#include <linux/kernel.h> 23#include <linux/ioctl.h> 24#include <linux/module.h> 25#include <linux/init.h> 26#include <linux/errno.h> 27#include <linux/mm.h> 28#include <linux/mmtimer.h> 29#include <linux/miscdevice.h> 30#include <linux/posix-timers.h> 31#include <linux/interrupt.h> 32 33#include <asm/uaccess.h> 34#include <asm/sn/addrs.h> 35#include <asm/sn/intr.h> 36#include <asm/sn/shub_mmr.h> 37#include <asm/sn/nodepda.h> 38#include <asm/sn/shubio.h> 39 40MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>"); 41MODULE_DESCRIPTION("SGI Altix RTC Timer"); 42MODULE_LICENSE("GPL"); 43 44/* name of the device, usually in /dev */ 45#define MMTIMER_NAME "mmtimer" 46#define MMTIMER_DESC "SGI Altix RTC Timer" 47#define MMTIMER_VERSION "2.1" 48 49#define RTC_BITS 55 /* 55 bits for this implementation */ 50 51extern unsigned long sn_rtc_cycles_per_second; 52 53#define RTC_COUNTER_ADDR ((long *)LOCAL_MMR_ADDR(SH_RTC)) 54 55#define rtc_time() (*RTC_COUNTER_ADDR) 56 57static int mmtimer_ioctl(struct inode *inode, struct file *file, 58 unsigned int cmd, unsigned long arg); 59static int mmtimer_mmap(struct file *file, struct vm_area_struct *vma); 60 61/* 62 * Period in femtoseconds (10^-15 s) 63 */ 64static unsigned long mmtimer_femtoperiod = 0; 65 66static const struct file_operations mmtimer_fops = { 67 .owner = THIS_MODULE, 68 .mmap = mmtimer_mmap, 69 .ioctl = mmtimer_ioctl, 70}; 71 72/* 73 * We only have comparison registers RTC1-4 currently available per 74 * node. RTC0 is used by SAL. 75 */ 76#define NUM_COMPARATORS 3 77/* Check for an RTC interrupt pending */ 78static int inline mmtimer_int_pending(int comparator) 79{ 80 if (HUB_L((unsigned long *)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED)) & 81 SH_EVENT_OCCURRED_RTC1_INT_MASK << comparator) 82 return 1; 83 else 84 return 0; 85} 86/* Clear the RTC interrupt pending bit */ 87static void inline mmtimer_clr_int_pending(int comparator) 88{ 89 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_EVENT_OCCURRED_ALIAS), 90 SH_EVENT_OCCURRED_RTC1_INT_MASK << comparator); 91} 92 93/* Setup timer on comparator RTC1 */ 94static void inline mmtimer_setup_int_0(u64 expires) 95{ 96 u64 val; 97 98 /* Disable interrupt */ 99 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC1_INT_ENABLE), 0UL); 100 101 /* Initialize comparator value */ 102 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPB), -1L); 103 104 /* Clear pending bit */ 105 mmtimer_clr_int_pending(0); 106 107 val = ((u64)SGI_MMTIMER_VECTOR << SH_RTC1_INT_CONFIG_IDX_SHFT) | 108 ((u64)cpu_physical_id(smp_processor_id()) << 109 SH_RTC1_INT_CONFIG_PID_SHFT); 110 111 /* Set configuration */ 112 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC1_INT_CONFIG), val); 113 114 /* Enable RTC interrupts */ 115 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC1_INT_ENABLE), 1UL); 116 117 /* Initialize comparator value */ 118 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPB), expires); 119 120 121} 122 123/* Setup timer on comparator RTC2 */ 124static void inline mmtimer_setup_int_1(u64 expires) 125{ 126 u64 val; 127 128 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC2_INT_ENABLE), 0UL); 129 130 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPC), -1L); 131 132 mmtimer_clr_int_pending(1); 133 134 val = ((u64)SGI_MMTIMER_VECTOR << SH_RTC2_INT_CONFIG_IDX_SHFT) | 135 ((u64)cpu_physical_id(smp_processor_id()) << 136 SH_RTC2_INT_CONFIG_PID_SHFT); 137 138 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC2_INT_CONFIG), val); 139 140 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC2_INT_ENABLE), 1UL); 141 142 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPC), expires); 143} 144 145/* Setup timer on comparator RTC3 */ 146static void inline mmtimer_setup_int_2(u64 expires) 147{ 148 u64 val; 149 150 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC3_INT_ENABLE), 0UL); 151 152 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPD), -1L); 153 154 mmtimer_clr_int_pending(2); 155 156 val = ((u64)SGI_MMTIMER_VECTOR << SH_RTC3_INT_CONFIG_IDX_SHFT) | 157 ((u64)cpu_physical_id(smp_processor_id()) << 158 SH_RTC3_INT_CONFIG_PID_SHFT); 159 160 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC3_INT_CONFIG), val); 161 162 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC3_INT_ENABLE), 1UL); 163 164 HUB_S((u64 *)LOCAL_MMR_ADDR(SH_INT_CMPD), expires); 165} 166 167/* 168 * This function must be called with interrupts disabled and preemption off 169 * in order to insure that the setup succeeds in a deterministic time frame. 170 * It will check if the interrupt setup succeeded. 171 */ 172static int inline mmtimer_setup(int comparator, unsigned long expires) 173{ 174 175 switch (comparator) { 176 case 0: 177 mmtimer_setup_int_0(expires); 178 break; 179 case 1: 180 mmtimer_setup_int_1(expires); 181 break; 182 case 2: 183 mmtimer_setup_int_2(expires); 184 break; 185 } 186 /* We might've missed our expiration time */ 187 if (rtc_time() < expires) 188 return 1; 189 190 /* 191 * If an interrupt is already pending then its okay 192 * if not then we failed 193 */ 194 return mmtimer_int_pending(comparator); 195} 196 197static int inline mmtimer_disable_int(long nasid, int comparator) 198{ 199 switch (comparator) { 200 case 0: 201 nasid == -1 ? HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC1_INT_ENABLE), 202 0UL) : REMOTE_HUB_S(nasid, SH_RTC1_INT_ENABLE, 0UL); 203 break; 204 case 1: 205 nasid == -1 ? HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC2_INT_ENABLE), 206 0UL) : REMOTE_HUB_S(nasid, SH_RTC2_INT_ENABLE, 0UL); 207 break; 208 case 2: 209 nasid == -1 ? HUB_S((u64 *)LOCAL_MMR_ADDR(SH_RTC3_INT_ENABLE), 210 0UL) : REMOTE_HUB_S(nasid, SH_RTC3_INT_ENABLE, 0UL); 211 break; 212 default: 213 return -EFAULT; 214 } 215 return 0; 216} 217 218#define TIMER_OFF 0xbadcabLL 219 220/* There is one of these for each comparator */ 221typedef struct mmtimer { 222 spinlock_t lock ____cacheline_aligned; 223 struct k_itimer *timer; 224 int i; 225 int cpu; 226 struct tasklet_struct tasklet; 227} mmtimer_t; 228 229static mmtimer_t ** timers; 230 231/** 232 * mmtimer_ioctl - ioctl interface for /dev/mmtimer 233 * @inode: inode of the device 234 * @file: file structure for the device 235 * @cmd: command to execute 236 * @arg: optional argument to command 237 * 238 * Executes the command specified by @cmd. Returns 0 for success, < 0 for 239 * failure. 240 * 241 * Valid commands: 242 * 243 * %MMTIMER_GETOFFSET - Should return the offset (relative to the start 244 * of the page where the registers are mapped) for the counter in question. 245 * 246 * %MMTIMER_GETRES - Returns the resolution of the clock in femto (10^-15) 247 * seconds 248 * 249 * %MMTIMER_GETFREQ - Copies the frequency of the clock in Hz to the address 250 * specified by @arg 251 * 252 * %MMTIMER_GETBITS - Returns the number of bits in the clock's counter 253 * 254 * %MMTIMER_MMAPAVAIL - Returns 1 if the registers can be mmap'd into userspace 255 * 256 * %MMTIMER_GETCOUNTER - Gets the current value in the counter and places it 257 * in the address specified by @arg. 258 */ 259static int mmtimer_ioctl(struct inode *inode, struct file *file, 260 unsigned int cmd, unsigned long arg) 261{ 262 int ret = 0; 263 264 switch (cmd) { 265 case MMTIMER_GETOFFSET: /* offset of the counter */ 266 /* 267 * SN RTC registers are on their own 64k page 268 */ 269 if(PAGE_SIZE <= (1 << 16)) 270 ret = (((long)RTC_COUNTER_ADDR) & (PAGE_SIZE-1)) / 8; 271 else 272 ret = -ENOSYS; 273 break; 274 275 case MMTIMER_GETRES: /* resolution of the clock in 10^-15 s */ 276 if(copy_to_user((unsigned long __user *)arg, 277 &mmtimer_femtoperiod, sizeof(unsigned long))) 278 return -EFAULT; 279 break; 280 281 case MMTIMER_GETFREQ: /* frequency in Hz */ 282 if(copy_to_user((unsigned long __user *)arg, 283 &sn_rtc_cycles_per_second, 284 sizeof(unsigned long))) 285 return -EFAULT; 286 ret = 0; 287 break; 288 289 case MMTIMER_GETBITS: /* number of bits in the clock */ 290 ret = RTC_BITS; 291 break; 292 293 case MMTIMER_MMAPAVAIL: /* can we mmap the clock into userspace? */ 294 ret = (PAGE_SIZE <= (1 << 16)) ? 1 : 0; 295 break; 296 297 case MMTIMER_GETCOUNTER: 298 if(copy_to_user((unsigned long __user *)arg, 299 RTC_COUNTER_ADDR, sizeof(unsigned long))) 300 return -EFAULT; 301 break; 302 default: 303 ret = -ENOSYS; 304 break; 305 } 306 307 return ret; 308} 309 310/** 311 * mmtimer_mmap - maps the clock's registers into userspace 312 * @file: file structure for the device 313 * @vma: VMA to map the registers into 314 * 315 * Calls remap_pfn_range() to map the clock's registers into 316 * the calling process' address space. 317 */ 318static int mmtimer_mmap(struct file *file, struct vm_area_struct *vma) 319{ 320 unsigned long mmtimer_addr; 321 322 if (vma->vm_end - vma->vm_start != PAGE_SIZE) 323 return -EINVAL; 324 325 if (vma->vm_flags & VM_WRITE) 326 return -EPERM; 327 328 if (PAGE_SIZE > (1 << 16)) 329 return -ENOSYS; 330 331 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 332 333 mmtimer_addr = __pa(RTC_COUNTER_ADDR); 334 mmtimer_addr &= ~(PAGE_SIZE - 1); 335 mmtimer_addr &= 0xfffffffffffffffUL; 336 337 if (remap_pfn_range(vma, vma->vm_start, mmtimer_addr >> PAGE_SHIFT, 338 PAGE_SIZE, vma->vm_page_prot)) { 339 printk(KERN_ERR "remap_pfn_range failed in mmtimer.c\n"); 340 return -EAGAIN; 341 } 342 343 return 0; 344} 345 346static struct miscdevice mmtimer_miscdev = { 347 SGI_MMTIMER, 348 MMTIMER_NAME, 349 &mmtimer_fops 350}; 351 352static struct timespec sgi_clock_offset; 353static int sgi_clock_period; 354 355/* 356 * Posix Timer Interface 357 */ 358 359static struct timespec sgi_clock_offset; 360static int sgi_clock_period; 361 362static int sgi_clock_get(clockid_t clockid, struct timespec *tp) 363{ 364 u64 nsec; 365 366 nsec = rtc_time() * sgi_clock_period 367 + sgi_clock_offset.tv_nsec; 368 tp->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &tp->tv_nsec) 369 + sgi_clock_offset.tv_sec; 370 return 0; 371}; 372 373static int sgi_clock_set(clockid_t clockid, struct timespec *tp) 374{ 375 376 u64 nsec; 377 u64 rem; 378 379 nsec = rtc_time() * sgi_clock_period; 380 381 sgi_clock_offset.tv_sec = tp->tv_sec - div_long_long_rem(nsec, NSEC_PER_SEC, &rem); 382 383 if (rem <= tp->tv_nsec) 384 sgi_clock_offset.tv_nsec = tp->tv_sec - rem; 385 else { 386 sgi_clock_offset.tv_nsec = tp->tv_sec + NSEC_PER_SEC - rem; 387 sgi_clock_offset.tv_sec--; 388 } 389 return 0; 390} 391 392/* 393 * Schedule the next periodic interrupt. This function will attempt 394 * to schedule a periodic interrupt later if necessary. If the scheduling 395 * of an interrupt fails then the time to skip is lengthened 396 * exponentially in order to ensure that the next interrupt 397 * can be properly scheduled.. 398 */ 399static int inline reschedule_periodic_timer(mmtimer_t *x) 400{ 401 int n; 402 struct k_itimer *t = x->timer; 403 404 t->it.mmtimer.clock = x->i; 405 t->it_overrun--; 406 407 n = 0; 408 do { 409 410 t->it.mmtimer.expires += t->it.mmtimer.incr << n; 411 t->it_overrun += 1 << n; 412 n++; 413 if (n > 20) 414 return 1; 415 416 } while (!mmtimer_setup(x->i, t->it.mmtimer.expires)); 417 418 return 0; 419} 420 421/** 422 * mmtimer_interrupt - timer interrupt handler 423 * @irq: irq received 424 * @dev_id: device the irq came from 425 * 426 * Called when one of the comarators matches the counter, This 427 * routine will send signals to processes that have requested 428 * them. 429 * 430 * This interrupt is run in an interrupt context 431 * by the SHUB. It is therefore safe to locally access SHub 432 * registers. 433 */ 434static irqreturn_t 435mmtimer_interrupt(int irq, void *dev_id) 436{ 437 int i; 438 unsigned long expires = 0; 439 int result = IRQ_NONE; 440 unsigned indx = cpu_to_node(smp_processor_id()); 441 442 /* 443 * Do this once for each comparison register 444 */ 445 for (i = 0; i < NUM_COMPARATORS; i++) { 446 mmtimer_t *base = timers[indx] + i; 447 /* Make sure this doesn't get reused before tasklet_sched */ 448 spin_lock(&base->lock); 449 if (base->cpu == smp_processor_id()) { 450 if (base->timer) 451 expires = base->timer->it.mmtimer.expires; 452 /* expires test won't work with shared irqs */ 453 if ((mmtimer_int_pending(i) > 0) || 454 (expires && (expires < rtc_time()))) { 455 mmtimer_clr_int_pending(i); 456 tasklet_schedule(&base->tasklet); 457 result = IRQ_HANDLED; 458 } 459 } 460 spin_unlock(&base->lock); 461 expires = 0; 462 } 463 return result; 464} 465 466void mmtimer_tasklet(unsigned long data) { 467 mmtimer_t *x = (mmtimer_t *)data; 468 struct k_itimer *t = x->timer; 469 unsigned long flags; 470 471 if (t == NULL) 472 return; 473 474 /* Send signal and deal with periodic signals */ 475 spin_lock_irqsave(&t->it_lock, flags); 476 spin_lock(&x->lock); 477 /* If timer was deleted between interrupt and here, leave */ 478 if (t != x->timer) 479 goto out; 480 t->it_overrun = 0; 481 482 if (posix_timer_event(t, 0) != 0) { 483 484 // printk(KERN_WARNING "mmtimer: cannot deliver signal.\n"); 485 486 t->it_overrun++; 487 } 488 if(t->it.mmtimer.incr) { 489 /* Periodic timer */ 490 if (reschedule_periodic_timer(x)) { 491 printk(KERN_WARNING "mmtimer: unable to reschedule\n"); 492 x->timer = NULL; 493 } 494 } else { 495 /* Ensure we don't false trigger in mmtimer_interrupt */ 496 t->it.mmtimer.expires = 0; 497 } 498 t->it_overrun_last = t->it_overrun; 499out: 500 spin_unlock(&x->lock); 501 spin_unlock_irqrestore(&t->it_lock, flags); 502} 503 504static int sgi_timer_create(struct k_itimer *timer) 505{ 506 /* Insure that a newly created timer is off */ 507 timer->it.mmtimer.clock = TIMER_OFF; 508 return 0; 509} 510 511/* This does not really delete a timer. It just insures 512 * that the timer is not active 513 * 514 * Assumption: it_lock is already held with irq's disabled 515 */ 516static int sgi_timer_del(struct k_itimer *timr) 517{ 518 int i = timr->it.mmtimer.clock; 519 cnodeid_t nodeid = timr->it.mmtimer.node; 520 mmtimer_t *t = timers[nodeid] + i; 521 unsigned long irqflags; 522 523 if (i != TIMER_OFF) { 524 spin_lock_irqsave(&t->lock, irqflags); 525 mmtimer_disable_int(cnodeid_to_nasid(nodeid),i); 526 t->timer = NULL; 527 timr->it.mmtimer.clock = TIMER_OFF; 528 timr->it.mmtimer.expires = 0; 529 spin_unlock_irqrestore(&t->lock, irqflags); 530 } 531 return 0; 532} 533 534#define timespec_to_ns(x) ((x).tv_nsec + (x).tv_sec * NSEC_PER_SEC) 535#define ns_to_timespec(ts, nsec) (ts).tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &(ts).tv_nsec) 536 537/* Assumption: it_lock is already held with irq's disabled */ 538static void sgi_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting) 539{ 540 541 if (timr->it.mmtimer.clock == TIMER_OFF) { 542 cur_setting->it_interval.tv_nsec = 0; 543 cur_setting->it_interval.tv_sec = 0; 544 cur_setting->it_value.tv_nsec = 0; 545 cur_setting->it_value.tv_sec =0; 546 return; 547 } 548 549 ns_to_timespec(cur_setting->it_interval, timr->it.mmtimer.incr * sgi_clock_period); 550 ns_to_timespec(cur_setting->it_value, (timr->it.mmtimer.expires - rtc_time())* sgi_clock_period); 551 return; 552} 553 554 555static int sgi_timer_set(struct k_itimer *timr, int flags, 556 struct itimerspec * new_setting, 557 struct itimerspec * old_setting) 558{ 559 560 int i; 561 unsigned long when, period, irqflags; 562 int err = 0; 563 cnodeid_t nodeid; 564 mmtimer_t *base; 565 566 if (old_setting) 567 sgi_timer_get(timr, old_setting); 568 569 sgi_timer_del(timr); 570 when = timespec_to_ns(new_setting->it_value); 571 period = timespec_to_ns(new_setting->it_interval); 572 573 if (when == 0) 574 /* Clear timer */ 575 return 0; 576 577 if (flags & TIMER_ABSTIME) { 578 struct timespec n; 579 unsigned long now; 580 581 getnstimeofday(&n); 582 now = timespec_to_ns(n); 583 if (when > now) 584 when -= now; 585 else 586 /* Fire the timer immediately */ 587 when = 0; 588 } 589 590 /* 591 * Convert to sgi clock period. Need to keep rtc_time() as near as possible 592 * to getnstimeofday() in order to be as faithful as possible to the time 593 * specified. 594 */ 595 when = (when + sgi_clock_period - 1) / sgi_clock_period + rtc_time(); 596 period = (period + sgi_clock_period - 1) / sgi_clock_period; 597 598 /* 599 * We are allocating a local SHub comparator. If we would be moved to another 600 * cpu then another SHub may be local to us. Prohibit that by switching off 601 * preemption. 602 */ 603 preempt_disable(); 604 605 nodeid = cpu_to_node(smp_processor_id()); 606retry: 607 /* Don't use an allocated timer, or a deleted one that's pending */ 608 for(i = 0; i< NUM_COMPARATORS; i++) { 609 base = timers[nodeid] + i; 610 if (!base->timer && !base->tasklet.state) { 611 break; 612 } 613 } 614 615 if (i == NUM_COMPARATORS) { 616 preempt_enable(); 617 return -EBUSY; 618 } 619 620 spin_lock_irqsave(&base->lock, irqflags); 621 622 if (base->timer || base->tasklet.state != 0) { 623 spin_unlock_irqrestore(&base->lock, irqflags); 624 goto retry; 625 } 626 base->timer = timr; 627 base->cpu = smp_processor_id(); 628 629 timr->it.mmtimer.clock = i; 630 timr->it.mmtimer.node = nodeid; 631 timr->it.mmtimer.incr = period; 632 timr->it.mmtimer.expires = when; 633 634 if (period == 0) { 635 if (!mmtimer_setup(i, when)) { 636 mmtimer_disable_int(-1, i); 637 posix_timer_event(timr, 0); 638 timr->it.mmtimer.expires = 0; 639 } 640 } else { 641 timr->it.mmtimer.expires -= period; 642 if (reschedule_periodic_timer(base)) 643 err = -EINVAL; 644 } 645 646 spin_unlock_irqrestore(&base->lock, irqflags); 647 648 preempt_enable(); 649 650 return err; 651} 652 653static struct k_clock sgi_clock = { 654 .res = 0, 655 .clock_set = sgi_clock_set, 656 .clock_get = sgi_clock_get, 657 .timer_create = sgi_timer_create, 658 .nsleep = do_posix_clock_nonanosleep, 659 .timer_set = sgi_timer_set, 660 .timer_del = sgi_timer_del, 661 .timer_get = sgi_timer_get 662}; 663 664/** 665 * mmtimer_init - device initialization routine 666 * 667 * Does initial setup for the mmtimer device. 668 */ 669static int __init mmtimer_init(void) 670{ 671 unsigned i; 672 cnodeid_t node, maxn = -1; 673 674 if (!ia64_platform_is("sn2")) 675 return 0; 676 677 /* 678 * Sanity check the cycles/sec variable 679 */ 680 if (sn_rtc_cycles_per_second < 100000) { 681 printk(KERN_ERR "%s: unable to determine clock frequency\n", 682 MMTIMER_NAME); 683 goto out1; 684 } 685 686 mmtimer_femtoperiod = ((unsigned long)1E15 + sn_rtc_cycles_per_second / 687 2) / sn_rtc_cycles_per_second; 688 689 if (request_irq(SGI_MMTIMER_VECTOR, mmtimer_interrupt, IRQF_PERCPU, MMTIMER_NAME, NULL)) { 690 printk(KERN_WARNING "%s: unable to allocate interrupt.", 691 MMTIMER_NAME); 692 goto out1; 693 } 694 695 if (misc_register(&mmtimer_miscdev)) { 696 printk(KERN_ERR "%s: failed to register device\n", 697 MMTIMER_NAME); 698 goto out2; 699 } 700 701 /* Get max numbered node, calculate slots needed */ 702 for_each_online_node(node) { 703 maxn = node; 704 } 705 maxn++; 706 707 /* Allocate list of node ptrs to mmtimer_t's */ 708 timers = kzalloc(sizeof(mmtimer_t *)*maxn, GFP_KERNEL); 709 if (timers == NULL) { 710 printk(KERN_ERR "%s: failed to allocate memory for device\n", 711 MMTIMER_NAME); 712 goto out3; 713 } 714 715 /* Allocate mmtimer_t's for each online node */ 716 for_each_online_node(node) { 717 timers[node] = kmalloc_node(sizeof(mmtimer_t)*NUM_COMPARATORS, GFP_KERNEL, node); 718 if (timers[node] == NULL) { 719 printk(KERN_ERR "%s: failed to allocate memory for device\n", 720 MMTIMER_NAME); 721 goto out4; 722 } 723 for (i=0; i< NUM_COMPARATORS; i++) { 724 mmtimer_t * base = timers[node] + i; 725 726 spin_lock_init(&base->lock); 727 base->timer = NULL; 728 base->cpu = 0; 729 base->i = i; 730 tasklet_init(&base->tasklet, mmtimer_tasklet, 731 (unsigned long) (base)); 732 } 733 } 734 735 sgi_clock_period = sgi_clock.res = NSEC_PER_SEC / sn_rtc_cycles_per_second; 736 register_posix_clock(CLOCK_SGI_CYCLE, &sgi_clock); 737 738 printk(KERN_INFO "%s: v%s, %ld MHz\n", MMTIMER_DESC, MMTIMER_VERSION, 739 sn_rtc_cycles_per_second/(unsigned long)1E6); 740 741 return 0; 742 743out4: 744 for_each_online_node(node) { 745 kfree(timers[node]); 746 } 747out3: 748 misc_deregister(&mmtimer_miscdev); 749out2: 750 free_irq(SGI_MMTIMER_VECTOR, NULL); 751out1: 752 return -1; 753} 754 755module_init(mmtimer_init); 756