drivers/clocksource/timer-ti-dm.c

   1 /*
   2  * linux/arch/arm/plat-omap/dmtimer.c
   3  *
   4  * OMAP Dual-Mode Timers
   5  *
   6  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
   7  * Tarun Kanti DebBarma <tarun.kanti@ti.com>
   8  * Thara Gopinath <thara@ti.com>
   9  *
  10  * dmtimer adaptation to platform_driver.
  11  *
  12  * Copyright (C) 2005 Nokia Corporation
  13  * OMAP2 support by Juha Yrjola
  14  * API improvements and OMAP2 clock framework support by Timo Teras
  15  *
  16  * Copyright (C) 2009 Texas Instruments
  17  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
  18  *
  19  * This program is free software; you can redistribute it and/or modify it
  20  * under the terms of the GNU General Public License as published by the
  21  * Free Software Foundation; either version 2 of the License, or (at your
  22  * option) any later version.
  23  *
  24  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  25  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  26  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  27  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  28  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  29  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  * You should have received a copy of the  GNU General Public License along
  34  * with this program; if not, write  to the Free Software Foundation, Inc.,
  35  * 675 Mass Ave, Cambridge, MA 02139, USA.
  36  */
  37
  38 #include <linux/clk.h>
  39 #include <linux/clk-provider.h>
  40 #include <linux/module.h>
  41 #include <linux/io.h>
  42 #include <linux/device.h>
  43 #include <linux/err.h>
  44 #include <linux/pm_runtime.h>
  45 #include <linux/of.h>
  46 #include <linux/of_device.h>
  47 #include <linux/platform_device.h>
  48 #include <linux/platform_data/dmtimer-omap.h>
  49
  50 #include <clocksource/timer-ti-dm.h>
  51
  52 static u32 omap_reserved_systimers;
  53 static LIST_HEAD(omap_timer_list);
  54 static DEFINE_SPINLOCK(dm_timer_lock);
  55
  56 enum {
  57         REQUEST_ANY = 0,
  58         REQUEST_BY_ID,
  59         REQUEST_BY_CAP,
  60         REQUEST_BY_NODE,
  61 };
  62
  63 /**
  64  * omap_dm_timer_read_reg - read timer registers in posted and non-posted mode
  65  * @timer:      timer pointer over which read operation to perform
  66  * @reg:        lowest byte holds the register offset
  67  *
  68  * The posted mode bit is encoded in reg. Note that in posted mode write
  69  * pending bit must be checked. Otherwise a read of a non completed write
  70  * will produce an error.
  71  */
  72 static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, u32 reg)
  73 {
  74         WARN_ON((reg & 0xff) < _OMAP_TIMER_WAKEUP_EN_OFFSET);
  75         return __omap_dm_timer_read(timer, reg, timer->posted);
  76 }
  77
  78 /**
  79  * omap_dm_timer_write_reg - write timer registers in posted and non-posted mode
  80  * @timer:      timer pointer over which write operation is to perform
  81  * @reg:        lowest byte holds the register offset
  82  * @value:      data to write into the register
  83  *
  84  * The posted mode bit is encoded in reg. Note that in posted mode the write
  85  * pending bit must be checked. Otherwise a write on a register which has a
  86  * pending write will be lost.
  87  */
  88 static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg,
  89                                                 u32 value)
  90 {
  91         WARN_ON((reg & 0xff) < _OMAP_TIMER_WAKEUP_EN_OFFSET);
  92         __omap_dm_timer_write(timer, reg, value, timer->posted);
  93 }
  94
  95 static void omap_timer_restore_context(struct omap_dm_timer *timer)
  96 {
  97         omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG,
  98                                 timer->context.twer);
  99         omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG,
 100                                 timer->context.tcrr);
 101         omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG,
 102                                 timer->context.tldr);
 103         omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG,
 104                                 timer->context.tmar);
 105         omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG,
 106                                 timer->context.tsicr);
 107         writel_relaxed(timer->context.tier, timer->irq_ena);
 108         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG,
 109                                 timer->context.tclr);
 110 }
 111
 112 static int omap_dm_timer_reset(struct omap_dm_timer *timer)
 113 {
 114         u32 l, timeout = 100000;
 115
 116         if (timer->revision != 1)
 117                 return -EINVAL;
 118
 119         omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
 120
 121         do {
 122                 l = __omap_dm_timer_read(timer,
 123                                          OMAP_TIMER_V1_SYS_STAT_OFFSET, 0);
 124         } while (!l && timeout--);
 125
 126         if (!timeout) {
 127                 dev_err(&timer->pdev->dev, "Timer failed to reset\n");
 128                 return -ETIMEDOUT;
 129         }
 130
 131         /* Configure timer for smart-idle mode */
 132         l = __omap_dm_timer_read(timer, OMAP_TIMER_OCP_CFG_OFFSET, 0);
 133         l |= 0x2 << 0x3;
 134         __omap_dm_timer_write(timer, OMAP_TIMER_OCP_CFG_OFFSET, l, 0);
 135
 136         timer->posted = 0;
 137
 138         return 0;
 139 }
 140
 141 static int omap_dm_timer_of_set_source(struct omap_dm_timer *timer)
 142 {
 143         int ret;
 144         struct clk *parent;
 145
 146         /*
 147          * FIXME: OMAP1 devices do not use the clock framework for dmtimers so
 148          * do not call clk_get() for these devices.
 149          */
 150         if (!timer->fclk)
 151                 return -ENODEV;
 152
 153         parent = clk_get(&timer->pdev->dev, NULL);
 154         if (IS_ERR(parent))
 155                 return -ENODEV;
 156
 157         /* Bail out if both clocks point to fck */
 158         if (clk_is_match(parent, timer->fclk))
 159                 return 0;
 160
 161         ret = clk_set_parent(timer->fclk, parent);
 162         if (ret < 0)
 163                 pr_err("%s: failed to set parent\n", __func__);
 164
 165         clk_put(parent);
 166
 167         return ret;
 168 }
 169
 170 static int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
 171 {
 172         int ret;
 173         const char *parent_name;
 174         struct clk *parent;
 175         struct dmtimer_platform_data *pdata;
 176
 177         if (unlikely(!timer) || IS_ERR(timer->fclk))
 178                 return -EINVAL;
 179
 180         switch (source) {
 181         case OMAP_TIMER_SRC_SYS_CLK:
 182                 parent_name = "timer_sys_ck";
 183                 break;
 184         case OMAP_TIMER_SRC_32_KHZ:
 185                 parent_name = "timer_32k_ck";
 186                 break;
 187         case OMAP_TIMER_SRC_EXT_CLK:
 188                 parent_name = "timer_ext_ck";
 189                 break;
 190         default:
 191                 return -EINVAL;
 192         }
 193
 194         pdata = timer->pdev->dev.platform_data;
 195
 196         /*
 197          * FIXME: Used for OMAP1 devices only because they do not currently
 198          * use the clock framework to set the parent clock. To be removed
 199          * once OMAP1 migrated to using clock framework for dmtimers
 200          */
 201         if (pdata && pdata->set_timer_src)
 202                 return pdata->set_timer_src(timer->pdev, source);
 203
 204 #if defined(CONFIG_COMMON_CLK)
 205         /* Check if the clock has configurable parents */
 206         if (clk_hw_get_num_parents(__clk_get_hw(timer->fclk)) < 2)
 207                 return 0;
 208 #endif
 209
 210         parent = clk_get(&timer->pdev->dev, parent_name);
 211         if (IS_ERR(parent)) {
 212                 pr_err("%s: %s not found\n", __func__, parent_name);
 213                 return -EINVAL;
 214         }
 215
 216         ret = clk_set_parent(timer->fclk, parent);
 217         if (ret < 0)
 218                 pr_err("%s: failed to set %s as parent\n", __func__,
 219                         parent_name);
 220
 221         clk_put(parent);
 222
 223         return ret;
 224 }
 225
 226 static void omap_dm_timer_enable(struct omap_dm_timer *timer)
 227 {
 228         int c;
 229
 230         pm_runtime_get_sync(&timer->pdev->dev);
 231
 232         if (!(timer->capability & OMAP_TIMER_ALWON)) {
 233                 if (timer->get_context_loss_count) {
 234                         c = timer->get_context_loss_count(&timer->pdev->dev);
 235                         if (c != timer->ctx_loss_count) {
 236                                 omap_timer_restore_context(timer);
 237                                 timer->ctx_loss_count = c;
 238                         }
 239                 } else {
 240                         omap_timer_restore_context(timer);
 241                 }
 242         }
 243 }
 244
 245 static void omap_dm_timer_disable(struct omap_dm_timer *timer)
 246 {
 247         pm_runtime_put_sync(&timer->pdev->dev);
 248 }
 249
 250 static int omap_dm_timer_prepare(struct omap_dm_timer *timer)
 251 {
 252         int rc;
 253
 254         /*
 255          * FIXME: OMAP1 devices do not use the clock framework for dmtimers so
 256          * do not call clk_get() for these devices.
 257          */
 258         if (!(timer->capability & OMAP_TIMER_NEEDS_RESET)) {
 259                 timer->fclk = clk_get(&timer->pdev->dev, "fck");
 260                 if (WARN_ON_ONCE(IS_ERR(timer->fclk))) {
 261                         dev_err(&timer->pdev->dev, ": No fclk handle.\n");
 262                         return -EINVAL;
 263                 }
 264         }
 265
 266         omap_dm_timer_enable(timer);
 267
 268         if (timer->capability & OMAP_TIMER_NEEDS_RESET) {
 269                 rc = omap_dm_timer_reset(timer);
 270                 if (rc) {
 271                         omap_dm_timer_disable(timer);
 272                         return rc;
 273                 }
 274         }
 275
 276         __omap_dm_timer_enable_posted(timer);
 277         omap_dm_timer_disable(timer);
 278
 279         rc = omap_dm_timer_of_set_source(timer);
 280         if (rc == -ENODEV)
 281                 return omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
 282
 283         return rc;
 284 }
 285
 286 static inline u32 omap_dm_timer_reserved_systimer(int id)
 287 {
 288         return (omap_reserved_systimers & (1 << (id - 1))) ? 1 : 0;
 289 }
 290
 291 int omap_dm_timer_reserve_systimer(int id)
 292 {
 293         if (omap_dm_timer_reserved_systimer(id))
 294                 return -ENODEV;
 295
 296         omap_reserved_systimers |= (1 << (id - 1));
 297
 298         return 0;
 299 }
 300
 301 static struct omap_dm_timer *_omap_dm_timer_request(int req_type, void *data)
 302 {
 303         struct omap_dm_timer *timer = NULL, *t;
 304         struct device_node *np = NULL;
 305         unsigned long flags;
 306         u32 cap = 0;
 307         int id = 0;
 308
 309         switch (req_type) {
 310         case REQUEST_BY_ID:
 311                 id = *(int *)data;
 312                 break;
 313         case REQUEST_BY_CAP:
 314                 cap = *(u32 *)data;
 315                 break;
 316         case REQUEST_BY_NODE:
 317                 np = (struct device_node *)data;
 318                 break;
 319         default:
 320                 /* REQUEST_ANY */
 321                 break;
 322         }
 323
 324         spin_lock_irqsave(&dm_timer_lock, flags);
 325         list_for_each_entry(t, &omap_timer_list, node) {
 326                 if (t->reserved)
 327                         continue;
 328
 329                 switch (req_type) {
 330                 case REQUEST_BY_ID:
 331                         if (id == t->pdev->id) {
 332                                 timer = t;
 333                                 timer->reserved = 1;
 334                                 goto found;
 335                         }
 336                         break;
 337                 case REQUEST_BY_CAP:
 338                         if (cap == (t->capability & cap)) {
 339                                 /*
 340                                  * If timer is not NULL, we have already found
 341                                  * one timer. But it was not an exact match
 342                                  * because it had more capabilities than what
 343                                  * was required. Therefore, unreserve the last
 344                                  * timer found and see if this one is a better
 345                                  * match.
 346                                  */
 347                                 if (timer)
 348                                         timer->reserved = 0;
 349                                 timer = t;
 350                                 timer->reserved = 1;
 351
 352                                 /* Exit loop early if we find an exact match */
 353                                 if (t->capability == cap)
 354                                         goto found;
 355                         }
 356                         break;
 357                 case REQUEST_BY_NODE:
 358                         if (np == t->pdev->dev.of_node) {
 359                                 timer = t;
 360                                 timer->reserved = 1;
 361                                 goto found;
 362                         }
 363                         break;
 364                 default:
 365                         /* REQUEST_ANY */
 366                         timer = t;
 367                         timer->reserved = 1;
 368                         goto found;
 369                 }
 370         }
 371 found:
 372         spin_unlock_irqrestore(&dm_timer_lock, flags);
 373
 374         if (timer && omap_dm_timer_prepare(timer)) {
 375                 timer->reserved = 0;
 376                 timer = NULL;
 377         }
 378
 379         if (!timer)
 380                 pr_debug("%s: timer request failed!\n", __func__);
 381
 382         return timer;
 383 }
 384
 385 static struct omap_dm_timer *omap_dm_timer_request(void)
 386 {
 387         return _omap_dm_timer_request(REQUEST_ANY, NULL);
 388 }
 389
 390 static struct omap_dm_timer *omap_dm_timer_request_specific(int id)
 391 {
 392         /* Requesting timer by ID is not supported when device tree is used */
 393         if (of_have_populated_dt()) {
 394                 pr_warn("%s: Please use omap_dm_timer_request_by_node()\n",
 395                         __func__);
 396                 return NULL;
 397         }
 398
 399         return _omap_dm_timer_request(REQUEST_BY_ID, &id);
 400 }
 401
 402 /**
 403  * omap_dm_timer_request_by_cap - Request a timer by capability
 404  * @cap:        Bit mask of capabilities to match
 405  *
 406  * Find a timer based upon capabilities bit mask. Callers of this function
 407  * should use the definitions found in the plat/dmtimer.h file under the
 408  * comment "timer capabilities used in hwmod database". Returns pointer to
 409  * timer handle on success and a NULL pointer on failure.
 410  */
 411 struct omap_dm_timer *omap_dm_timer_request_by_cap(u32 cap)
 412 {
 413         return _omap_dm_timer_request(REQUEST_BY_CAP, &cap);
 414 }
 415
 416 /**
 417  * omap_dm_timer_request_by_node - Request a timer by device-tree node
 418  * @np:         Pointer to device-tree timer node
 419  *
 420  * Request a timer based upon a device node pointer. Returns pointer to
 421  * timer handle on success and a NULL pointer on failure.
 422  */
 423 static struct omap_dm_timer *omap_dm_timer_request_by_node(struct device_node *np)
 424 {
 425         if (!np)
 426                 return NULL;
 427
 428         return _omap_dm_timer_request(REQUEST_BY_NODE, np);
 429 }
 430
 431 static int omap_dm_timer_free(struct omap_dm_timer *timer)
 432 {
 433         if (unlikely(!timer))
 434                 return -EINVAL;
 435
 436         clk_put(timer->fclk);
 437
 438         WARN_ON(!timer->reserved);
 439         timer->reserved = 0;
 440         return 0;
 441 }
 442
 443 int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
 444 {
 445         if (timer)
 446                 return timer->irq;
 447         return -EINVAL;
 448 }
 449
 450 #if defined(CONFIG_ARCH_OMAP1)
 451 #include <mach/hardware.h>
 452
 453 static struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
 454 {
 455         return NULL;
 456 }
 457
 458 /**
 459  * omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR
 460  * @inputmask: current value of idlect mask
 461  */
 462 __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
 463 {
 464         int i = 0;
 465         struct omap_dm_timer *timer = NULL;
 466         unsigned long flags;
 467
 468         /* If ARMXOR cannot be idled this function call is unnecessary */
 469         if (!(inputmask & (1 << 1)))
 470                 return inputmask;
 471
 472         /* If any active timer is using ARMXOR return modified mask */
 473         spin_lock_irqsave(&dm_timer_lock, flags);
 474         list_for_each_entry(timer, &omap_timer_list, node) {
 475                 u32 l;
 476
 477                 l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 478                 if (l & OMAP_TIMER_CTRL_ST) {
 479                         if (((omap_readl(MOD_CONF_CTRL_1) >> (i * 2)) & 0x03) == 0)
 480                                 inputmask &= ~(1 << 1);
 481                         else
 482                                 inputmask &= ~(1 << 2);
 483                 }
 484                 i++;
 485         }
 486         spin_unlock_irqrestore(&dm_timer_lock, flags);
 487
 488         return inputmask;
 489 }
 490
 491 #else
 492
 493 static struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
 494 {
 495         if (timer && !IS_ERR(timer->fclk))
 496                 return timer->fclk;
 497         return NULL;
 498 }
 499
 500 __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
 501 {
 502         BUG();
 503
 504         return 0;
 505 }
 506
 507 #endif
 508
 509 int omap_dm_timer_trigger(struct omap_dm_timer *timer)
 510 {
 511         if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
 512                 pr_err("%s: timer not available or enabled.\n", __func__);
 513                 return -EINVAL;
 514         }
 515
 516         omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
 517         return 0;
 518 }
 519
 520 static int omap_dm_timer_start(struct omap_dm_timer *timer)
 521 {
 522         u32 l;
 523
 524         if (unlikely(!timer))
 525                 return -EINVAL;
 526
 527         omap_dm_timer_enable(timer);
 528
 529         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 530         if (!(l & OMAP_TIMER_CTRL_ST)) {
 531                 l |= OMAP_TIMER_CTRL_ST;
 532                 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 533         }
 534
 535         /* Save the context */
 536         timer->context.tclr = l;
 537         return 0;
 538 }
 539
 540 static int omap_dm_timer_stop(struct omap_dm_timer *timer)
 541 {
 542         unsigned long rate = 0;
 543
 544         if (unlikely(!timer))
 545                 return -EINVAL;
 546
 547         if (!(timer->capability & OMAP_TIMER_NEEDS_RESET))
 548                 rate = clk_get_rate(timer->fclk);
 549
 550         __omap_dm_timer_stop(timer, timer->posted, rate);
 551
 552         /*
 553          * Since the register values are computed and written within
 554          * __omap_dm_timer_stop, we need to use read to retrieve the
 555          * context.
 556          */
 557         timer->context.tclr =
 558                         omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 559         omap_dm_timer_disable(timer);
 560         return 0;
 561 }
 562
 563 static int omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
 564                                   unsigned int load)
 565 {
 566         u32 l;
 567
 568         if (unlikely(!timer))
 569                 return -EINVAL;
 570
 571         omap_dm_timer_enable(timer);
 572         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 573         if (autoreload)
 574                 l |= OMAP_TIMER_CTRL_AR;
 575         else
 576                 l &= ~OMAP_TIMER_CTRL_AR;
 577         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 578         omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
 579
 580         omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
 581         /* Save the context */
 582         timer->context.tclr = l;
 583         timer->context.tldr = load;
 584         omap_dm_timer_disable(timer);
 585         return 0;
 586 }
 587
 588 static int omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
 589                                    unsigned int match)
 590 {
 591         u32 l;
 592
 593         if (unlikely(!timer))
 594                 return -EINVAL;
 595
 596         omap_dm_timer_enable(timer);
 597         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 598         if (enable)
 599                 l |= OMAP_TIMER_CTRL_CE;
 600         else
 601                 l &= ~OMAP_TIMER_CTRL_CE;
 602         omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
 603         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 604
 605         /* Save the context */
 606         timer->context.tclr = l;
 607         timer->context.tmar = match;
 608         omap_dm_timer_disable(timer);
 609         return 0;
 610 }
 611
 612 static int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
 613                                  int toggle, int trigger)
 614 {
 615         u32 l;
 616
 617         if (unlikely(!timer))
 618                 return -EINVAL;
 619
 620         omap_dm_timer_enable(timer);
 621         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 622         l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
 623                OMAP_TIMER_CTRL_PT | (0x03 << 10));
 624         if (def_on)
 625                 l |= OMAP_TIMER_CTRL_SCPWM;
 626         if (toggle)
 627                 l |= OMAP_TIMER_CTRL_PT;
 628         l |= trigger << 10;
 629         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 630
 631         /* Save the context */
 632         timer->context.tclr = l;
 633         omap_dm_timer_disable(timer);
 634         return 0;
 635 }
 636
 637 static int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer,
 638                                         int prescaler)
 639 {
 640         u32 l;
 641
 642         if (unlikely(!timer) || prescaler < -1 || prescaler > 7)
 643                 return -EINVAL;
 644
 645         omap_dm_timer_enable(timer);
 646         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 647         l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
 648         if (prescaler >= 0) {
 649                 l |= OMAP_TIMER_CTRL_PRE;
 650                 l |= prescaler << 2;
 651         }
 652         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 653
 654         /* Save the context */
 655         timer->context.tclr = l;
 656         omap_dm_timer_disable(timer);
 657         return 0;
 658 }
 659
 660 static int omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
 661                                         unsigned int value)
 662 {
 663         if (unlikely(!timer))
 664                 return -EINVAL;
 665
 666         omap_dm_timer_enable(timer);
 667         __omap_dm_timer_int_enable(timer, value);
 668
 669         /* Save the context */
 670         timer->context.tier = value;
 671         timer->context.twer = value;
 672         omap_dm_timer_disable(timer);
 673         return 0;
 674 }
 675
 676 /**
 677  * omap_dm_timer_set_int_disable - disable timer interrupts
 678  * @timer:      pointer to timer handle
 679  * @mask:       bit mask of interrupts to be disabled
 680  *
 681  * Disables the specified timer interrupts for a timer.
 682  */
 683 static int omap_dm_timer_set_int_disable(struct omap_dm_timer *timer, u32 mask)
 684 {
 685         u32 l = mask;
 686
 687         if (unlikely(!timer))
 688                 return -EINVAL;
 689
 690         omap_dm_timer_enable(timer);
 691
 692         if (timer->revision == 1)
 693                 l = readl_relaxed(timer->irq_ena) & ~mask;
 694
 695         writel_relaxed(l, timer->irq_dis);
 696         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_WAKEUP_EN_REG) & ~mask;
 697         omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG, l);
 698
 699         /* Save the context */
 700         timer->context.tier &= ~mask;
 701         timer->context.twer &= ~mask;
 702         omap_dm_timer_disable(timer);
 703         return 0;
 704 }
 705
 706 static unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
 707 {
 708         unsigned int l;
 709
 710         if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
 711                 pr_err("%s: timer not available or enabled.\n", __func__);
 712                 return 0;
 713         }
 714
 715         l = readl_relaxed(timer->irq_stat);
 716
 717         return l;
 718 }
 719
 720 static int omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
 721 {
 722         if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev)))
 723                 return -EINVAL;
 724
 725         __omap_dm_timer_write_status(timer, value);
 726
 727         return 0;
 728 }
 729
 730 static unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
 731 {
 732         if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
 733                 pr_err("%s: timer not iavailable or enabled.\n", __func__);
 734                 return 0;
 735         }
 736
 737         return __omap_dm_timer_read_counter(timer, timer->posted);
 738 }
 739
 740 static int omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value)
 741 {
 742         if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
 743                 pr_err("%s: timer not available or enabled.\n", __func__);
 744                 return -EINVAL;
 745         }
 746
 747         omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value);
 748
 749         /* Save the context */
 750         timer->context.tcrr = value;
 751         return 0;
 752 }
 753
 754 int omap_dm_timers_active(void)
 755 {
 756         struct omap_dm_timer *timer;
 757
 758         list_for_each_entry(timer, &omap_timer_list, node) {
 759                 if (!timer->reserved)
 760                         continue;
 761
 762                 if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
 763                     OMAP_TIMER_CTRL_ST) {
 764                         return 1;
 765                 }
 766         }
 767         return 0;
 768 }
 769
 770 static const struct of_device_id omap_timer_match[];
 771
 772 /**
 773  * omap_dm_timer_probe - probe function called for every registered device
 774  * @pdev:       pointer to current timer platform device
 775  *
 776  * Called by driver framework at the end of device registration for all
 777  * timer devices.
 778  */
 779 static int omap_dm_timer_probe(struct platform_device *pdev)
 780 {
 781         unsigned long flags;
 782         struct omap_dm_timer *timer;
 783         struct device *dev = &pdev->dev;
 784         const struct dmtimer_platform_data *pdata;
 785         int ret;
 786
 787         pdata = of_device_get_match_data(dev);
 788         if (!pdata)
 789                 pdata = dev_get_platdata(dev);
 790         else
 791                 dev->platform_data = (void *)pdata;
 792
 793         if (!pdata) {
 794                 dev_err(dev, "%s: no platform data.\n", __func__);
 795                 return -ENODEV;
 796         }
 797
 798         timer = devm_kzalloc(dev, sizeof(*timer), GFP_KERNEL);
 799         if (!timer)
 800                 return  -ENOMEM;
 801
 802         timer->irq = platform_get_irq(pdev, 0);
 803         if (timer->irq < 0)
 804                 return timer->irq;
 805
 806         timer->fclk = ERR_PTR(-ENODEV);
 807         timer->io_base = devm_platform_ioremap_resource(pdev, 0);
 808         if (IS_ERR(timer->io_base))
 809                 return PTR_ERR(timer->io_base);
 810
 811         if (dev->of_node) {
 812                 if (of_find_property(dev->of_node, "ti,timer-alwon", NULL))
 813                         timer->capability |= OMAP_TIMER_ALWON;
 814                 if (of_find_property(dev->of_node, "ti,timer-dsp", NULL))
 815                         timer->capability |= OMAP_TIMER_HAS_DSP_IRQ;
 816                 if (of_find_property(dev->of_node, "ti,timer-pwm", NULL))
 817                         timer->capability |= OMAP_TIMER_HAS_PWM;
 818                 if (of_find_property(dev->of_node, "ti,timer-secure", NULL))
 819                         timer->capability |= OMAP_TIMER_SECURE;
 820         } else {
 821                 timer->id = pdev->id;
 822                 timer->capability = pdata->timer_capability;
 823                 timer->reserved = omap_dm_timer_reserved_systimer(timer->id);
 824                 timer->get_context_loss_count = pdata->get_context_loss_count;
 825         }
 826
 827         if (pdata)
 828                 timer->errata = pdata->timer_errata;
 829
 830         timer->pdev = pdev;
 831
 832         pm_runtime_enable(dev);
 833
 834         if (!timer->reserved) {
 835                 ret = pm_runtime_get_sync(dev);
 836                 if (ret < 0) {
 837                         dev_err(dev, "%s: pm_runtime_get_sync failed!\n",
 838                                 __func__);
 839                         goto err_get_sync;
 840                 }
 841                 __omap_dm_timer_init_regs(timer);
 842                 pm_runtime_put(dev);
 843         }
 844
 845         /* add the timer element to the list */
 846         spin_lock_irqsave(&dm_timer_lock, flags);
 847         list_add_tail(&timer->node, &omap_timer_list);
 848         spin_unlock_irqrestore(&dm_timer_lock, flags);
 849
 850         dev_dbg(dev, "Device Probed.\n");
 851
 852         return 0;
 853
 854 err_get_sync:
 855         pm_runtime_put_noidle(dev);
 856         pm_runtime_disable(dev);
 857         return ret;
 858 }
 859
 860 /**
 861  * omap_dm_timer_remove - cleanup a registered timer device
 862  * @pdev:       pointer to current timer platform device
 863  *
 864  * Called by driver framework whenever a timer device is unregistered.
 865  * In addition to freeing platform resources it also deletes the timer
 866  * entry from the local list.
 867  */
 868 static int omap_dm_timer_remove(struct platform_device *pdev)
 869 {
 870         struct omap_dm_timer *timer;
 871         unsigned long flags;
 872         int ret = -EINVAL;
 873
 874         spin_lock_irqsave(&dm_timer_lock, flags);
 875         list_for_each_entry(timer, &omap_timer_list, node)
 876                 if (!strcmp(dev_name(&timer->pdev->dev),
 877                             dev_name(&pdev->dev))) {
 878                         list_del(&timer->node);
 879                         ret = 0;
 880                         break;
 881                 }
 882         spin_unlock_irqrestore(&dm_timer_lock, flags);
 883
 884         pm_runtime_disable(&pdev->dev);
 885
 886         return ret;
 887 }
 888
 889 static const struct omap_dm_timer_ops dmtimer_ops = {
 890         .request_by_node = omap_dm_timer_request_by_node,
 891         .request_specific = omap_dm_timer_request_specific,
 892         .request = omap_dm_timer_request,
 893         .set_source = omap_dm_timer_set_source,
 894         .get_irq = omap_dm_timer_get_irq,
 895         .set_int_enable = omap_dm_timer_set_int_enable,
 896         .set_int_disable = omap_dm_timer_set_int_disable,
 897         .free = omap_dm_timer_free,
 898         .enable = omap_dm_timer_enable,
 899         .disable = omap_dm_timer_disable,
 900         .get_fclk = omap_dm_timer_get_fclk,
 901         .start = omap_dm_timer_start,
 902         .stop = omap_dm_timer_stop,
 903         .set_load = omap_dm_timer_set_load,
 904         .set_match = omap_dm_timer_set_match,
 905         .set_pwm = omap_dm_timer_set_pwm,
 906         .set_prescaler = omap_dm_timer_set_prescaler,
 907         .read_counter = omap_dm_timer_read_counter,
 908         .write_counter = omap_dm_timer_write_counter,
 909         .read_status = omap_dm_timer_read_status,
 910         .write_status = omap_dm_timer_write_status,
 911 };
 912
 913 static const struct dmtimer_platform_data omap3plus_pdata = {
 914         .timer_errata = OMAP_TIMER_ERRATA_I103_I767,
 915         .timer_ops = &dmtimer_ops,
 916 };
 917
 918 static const struct of_device_id omap_timer_match[] = {
 919         {
 920                 .compatible = "ti,omap2420-timer",
 921         },
 922         {
 923                 .compatible = "ti,omap3430-timer",
 924                 .data = &omap3plus_pdata,
 925         },
 926         {
 927                 .compatible = "ti,omap4430-timer",
 928                 .data = &omap3plus_pdata,
 929         },
 930         {
 931                 .compatible = "ti,omap5430-timer",
 932                 .data = &omap3plus_pdata,
 933         },
 934         {
 935                 .compatible = "ti,am335x-timer",
 936                 .data = &omap3plus_pdata,
 937         },
 938         {
 939                 .compatible = "ti,am335x-timer-1ms",
 940                 .data = &omap3plus_pdata,
 941         },
 942         {
 943                 .compatible = "ti,dm816-timer",
 944                 .data = &omap3plus_pdata,
 945         },
 946         {},
 947 };
 948 MODULE_DEVICE_TABLE(of, omap_timer_match);
 949
 950 static struct platform_driver omap_dm_timer_driver = {
 951         .probe  = omap_dm_timer_probe,
 952         .remove = omap_dm_timer_remove,
 953         .driver = {
 954                 .name   = "omap_timer",
 955                 .of_match_table = of_match_ptr(omap_timer_match),
 956         },
 957 };
 958
 959 module_platform_driver(omap_dm_timer_driver);
 960
 961 MODULE_DESCRIPTION("OMAP Dual-Mode Timer Driver");
 962 MODULE_LICENSE("GPL");
 963 MODULE_AUTHOR("Texas Instruments Inc");