arch/arm/plat-omap/dmtimer.c

   1 /*
   2  * linux/arch/arm/plat-omap/dmtimer.c
   3  *
   4  * OMAP Dual-Mode Timers
   5  *
   6  * Copyright (C) 2005 Nokia Corporation
   7  * OMAP2 support by Juha Yrjola
   8  * API improvements and OMAP2 clock framework support by Timo Teras
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the
  12  * Free Software Foundation; either version 2 of the License, or (at your
  13  * option) any later version.
  14  *
  15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  16  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  17  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  18  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  *
  24  * You should have received a copy of the  GNU General Public License along
  25  * with this program; if not, write  to the Free Software Foundation, Inc.,
  26  * 675 Mass Ave, Cambridge, MA 02139, USA.
  27  */
  28
  29 #include <linux/init.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/errno.h>
  32 #include <linux/list.h>
  33 #include <linux/clk.h>
  34 #include <linux/delay.h>
  35 #include <asm/hardware.h>
  36 #include <asm/arch/dmtimer.h>
  37 #include <asm/io.h>
  38 #include <asm/arch/irqs.h>
  39
  40 /* register offsets */
  41 #define OMAP_TIMER_ID_REG               0x00
  42 #define OMAP_TIMER_OCP_CFG_REG          0x10
  43 #define OMAP_TIMER_SYS_STAT_REG         0x14
  44 #define OMAP_TIMER_STAT_REG             0x18
  45 #define OMAP_TIMER_INT_EN_REG           0x1c
  46 #define OMAP_TIMER_WAKEUP_EN_REG        0x20
  47 #define OMAP_TIMER_CTRL_REG             0x24
  48 #define OMAP_TIMER_COUNTER_REG          0x28
  49 #define OMAP_TIMER_LOAD_REG             0x2c
  50 #define OMAP_TIMER_TRIGGER_REG          0x30
  51 #define OMAP_TIMER_WRITE_PEND_REG       0x34
  52 #define OMAP_TIMER_MATCH_REG            0x38
  53 #define OMAP_TIMER_CAPTURE_REG          0x3c
  54 #define OMAP_TIMER_IF_CTRL_REG          0x40
  55
  56 /* timer control reg bits */
  57 #define OMAP_TIMER_CTRL_GPOCFG          (1 << 14)
  58 #define OMAP_TIMER_CTRL_CAPTMODE        (1 << 13)
  59 #define OMAP_TIMER_CTRL_PT              (1 << 12)
  60 #define OMAP_TIMER_CTRL_TCM_LOWTOHIGH   (0x1 << 8)
  61 #define OMAP_TIMER_CTRL_TCM_HIGHTOLOW   (0x2 << 8)
  62 #define OMAP_TIMER_CTRL_TCM_BOTHEDGES   (0x3 << 8)
  63 #define OMAP_TIMER_CTRL_SCPWM           (1 << 7)
  64 #define OMAP_TIMER_CTRL_CE              (1 << 6)        /* compare enable */
  65 #define OMAP_TIMER_CTRL_PRE             (1 << 5)        /* prescaler enable */
  66 #define OMAP_TIMER_CTRL_PTV_SHIFT       2               /* how much to shift the prescaler value */
  67 #define OMAP_TIMER_CTRL_AR              (1 << 1)        /* auto-reload enable */
  68 #define OMAP_TIMER_CTRL_ST              (1 << 0)        /* start timer */
  69
  70 struct omap_dm_timer {
  71         unsigned long phys_base;
  72         int irq;
  73 #ifdef CONFIG_ARCH_OMAP2
  74         struct clk *iclk, *fclk;
  75 #endif
  76         void __iomem *io_base;
  77         unsigned reserved:1;
  78         unsigned enabled:1;
  79 };
  80
  81 #ifdef CONFIG_ARCH_OMAP1
  82
  83 #define omap_dm_clk_enable(x)
  84 #define omap_dm_clk_disable(x)
  85
  86 static struct omap_dm_timer dm_timers[] = {
  87         { .phys_base = 0xfffb1400, .irq = INT_1610_GPTIMER1 },
  88         { .phys_base = 0xfffb1c00, .irq = INT_1610_GPTIMER2 },
  89         { .phys_base = 0xfffb2400, .irq = INT_1610_GPTIMER3 },
  90         { .phys_base = 0xfffb2c00, .irq = INT_1610_GPTIMER4 },
  91         { .phys_base = 0xfffb3400, .irq = INT_1610_GPTIMER5 },
  92         { .phys_base = 0xfffb3c00, .irq = INT_1610_GPTIMER6 },
  93         { .phys_base = 0xfffb7400, .irq = INT_1610_GPTIMER7 },
  94         { .phys_base = 0xfffbd400, .irq = INT_1610_GPTIMER8 },
  95 };
  96
  97 #elif defined(CONFIG_ARCH_OMAP2)
  98
  99 #define omap_dm_clk_enable(x) clk_enable(x)
 100 #define omap_dm_clk_disable(x) clk_disable(x)
 101
 102 static struct omap_dm_timer dm_timers[] = {
 103         { .phys_base = 0x48028000, .irq = INT_24XX_GPTIMER1 },
 104         { .phys_base = 0x4802a000, .irq = INT_24XX_GPTIMER2 },
 105         { .phys_base = 0x48078000, .irq = INT_24XX_GPTIMER3 },
 106         { .phys_base = 0x4807a000, .irq = INT_24XX_GPTIMER4 },
 107         { .phys_base = 0x4807c000, .irq = INT_24XX_GPTIMER5 },
 108         { .phys_base = 0x4807e000, .irq = INT_24XX_GPTIMER6 },
 109         { .phys_base = 0x48080000, .irq = INT_24XX_GPTIMER7 },
 110         { .phys_base = 0x48082000, .irq = INT_24XX_GPTIMER8 },
 111         { .phys_base = 0x48084000, .irq = INT_24XX_GPTIMER9 },
 112         { .phys_base = 0x48086000, .irq = INT_24XX_GPTIMER10 },
 113         { .phys_base = 0x48088000, .irq = INT_24XX_GPTIMER11 },
 114         { .phys_base = 0x4808a000, .irq = INT_24XX_GPTIMER12 },
 115 };
 116
 117 static const char *dm_source_names[] = {
 118         "sys_ck",
 119         "func_32k_ck",
 120         "alt_ck"
 121 };
 122
 123 static struct clk *dm_source_clocks[3];
 124
 125 #else
 126
 127 #error OMAP architecture not supported!
 128
 129 #endif
 130
 131 static const int dm_timer_count = ARRAY_SIZE(dm_timers);
 132 static spinlock_t dm_timer_lock;
 133
 134 static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, int reg)
 135 {
 136         return readl(timer->io_base + reg);
 137 }
 138
 139 static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, int reg, u32 value)
 140 {
 141         writel(value, timer->io_base + reg);
 142         while (omap_dm_timer_read_reg(timer, OMAP_TIMER_WRITE_PEND_REG))
 143                 ;
 144 }
 145
 146 static void omap_dm_timer_wait_for_reset(struct omap_dm_timer *timer)
 147 {
 148         int c;
 149
 150         c = 0;
 151         while (!(omap_dm_timer_read_reg(timer, OMAP_TIMER_SYS_STAT_REG) & 1)) {
 152                 c++;
 153                 if (c > 100000) {
 154                         printk(KERN_ERR "Timer failed to reset\n");
 155                         return;
 156                 }
 157         }
 158 }
 159
 160 static void omap_dm_timer_reset(struct omap_dm_timer *timer)
 161 {
 162         u32 l;
 163
 164         if (!cpu_class_is_omap2() || timer != &dm_timers[0]) {
 165                 omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
 166                 omap_dm_timer_wait_for_reset(timer);
 167         }
 168         omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
 169
 170         /* Set to smart-idle mode */
 171         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_OCP_CFG_REG);
 172         l |= 0x02 << 3;
 173
 174         if (cpu_class_is_omap2() && timer == &dm_timers[0]) {
 175                 /* Enable wake-up only for GPT1 on OMAP2 CPUs*/
 176                 l |= 1 << 2;
 177                 /* Non-posted mode */
 178                 omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0);
 179         }
 180         omap_dm_timer_write_reg(timer, OMAP_TIMER_OCP_CFG_REG, l);
 181 }
 182
 183 static void omap_dm_timer_prepare(struct omap_dm_timer *timer)
 184 {
 185         omap_dm_timer_enable(timer);
 186         omap_dm_timer_reset(timer);
 187 }
 188
 189 struct omap_dm_timer *omap_dm_timer_request(void)
 190 {
 191         struct omap_dm_timer *timer = NULL;
 192         unsigned long flags;
 193         int i;
 194
 195         spin_lock_irqsave(&dm_timer_lock, flags);
 196         for (i = 0; i < dm_timer_count; i++) {
 197                 if (dm_timers[i].reserved)
 198                         continue;
 199
 200                 timer = &dm_timers[i];
 201                 timer->reserved = 1;
 202                 break;
 203         }
 204         spin_unlock_irqrestore(&dm_timer_lock, flags);
 205
 206         if (timer != NULL)
 207                 omap_dm_timer_prepare(timer);
 208
 209         return timer;
 210 }
 211
 212 struct omap_dm_timer *omap_dm_timer_request_specific(int id)
 213 {
 214         struct omap_dm_timer *timer;
 215         unsigned long flags;
 216
 217         spin_lock_irqsave(&dm_timer_lock, flags);
 218         if (id <= 0 || id > dm_timer_count || dm_timers[id-1].reserved) {
 219                 spin_unlock_irqrestore(&dm_timer_lock, flags);
 220                 printk("BUG: warning at %s:%d/%s(): unable to get timer %d\n",
 221                        __FILE__, __LINE__, __FUNCTION__, id);
 222                 dump_stack();
 223                 return NULL;
 224         }
 225
 226         timer = &dm_timers[id-1];
 227         timer->reserved = 1;
 228         spin_unlock_irqrestore(&dm_timer_lock, flags);
 229
 230         omap_dm_timer_prepare(timer);
 231
 232         return timer;
 233 }
 234
 235 void omap_dm_timer_free(struct omap_dm_timer *timer)
 236 {
 237         omap_dm_timer_enable(timer);
 238         omap_dm_timer_reset(timer);
 239         omap_dm_timer_disable(timer);
 240
 241         WARN_ON(!timer->reserved);
 242         timer->reserved = 0;
 243 }
 244
 245 void omap_dm_timer_enable(struct omap_dm_timer *timer)
 246 {
 247         if (timer->enabled)
 248                 return;
 249
 250         omap_dm_clk_enable(timer->fclk);
 251         omap_dm_clk_enable(timer->iclk);
 252
 253         timer->enabled = 1;
 254 }
 255
 256 void omap_dm_timer_disable(struct omap_dm_timer *timer)
 257 {
 258         if (!timer->enabled)
 259                 return;
 260
 261         omap_dm_clk_disable(timer->iclk);
 262         omap_dm_clk_disable(timer->fclk);
 263
 264         timer->enabled = 0;
 265 }
 266
 267 int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
 268 {
 269         return timer->irq;
 270 }
 271
 272 #if defined(CONFIG_ARCH_OMAP1)
 273
 274 /**
 275  * omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR
 276  * @inputmask: current value of idlect mask
 277  */
 278 __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
 279 {
 280         int i;
 281
 282         /* If ARMXOR cannot be idled this function call is unnecessary */
 283         if (!(inputmask & (1 << 1)))
 284                 return inputmask;
 285
 286         /* If any active timer is using ARMXOR return modified mask */
 287         for (i = 0; i < dm_timer_count; i++) {
 288                 u32 l;
 289
 290                 l = omap_dm_timer_read_reg(&dm_timers[i], OMAP_TIMER_CTRL_REG);
 291                 if (l & OMAP_TIMER_CTRL_ST) {
 292                         if (((omap_readl(MOD_CONF_CTRL_1) >> (i * 2)) & 0x03) == 0)
 293                                 inputmask &= ~(1 << 1);
 294                         else
 295                                 inputmask &= ~(1 << 2);
 296                 }
 297         }
 298
 299         return inputmask;
 300 }
 301
 302 #elif defined(CONFIG_ARCH_OMAP2)
 303
 304 struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
 305 {
 306         return timer->fclk;
 307 }
 308
 309 __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
 310 {
 311         BUG();
 312
 313         return 0;
 314 }
 315
 316 #endif
 317
 318 void omap_dm_timer_trigger(struct omap_dm_timer *timer)
 319 {
 320         omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
 321 }
 322
 323 void omap_dm_timer_start(struct omap_dm_timer *timer)
 324 {
 325         u32 l;
 326
 327         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 328         if (!(l & OMAP_TIMER_CTRL_ST)) {
 329                 l |= OMAP_TIMER_CTRL_ST;
 330                 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 331         }
 332 }
 333
 334 void omap_dm_timer_stop(struct omap_dm_timer *timer)
 335 {
 336         u32 l;
 337
 338         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 339         if (l & OMAP_TIMER_CTRL_ST) {
 340                 l &= ~0x1;
 341                 omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 342         }
 343 }
 344
 345 #ifdef CONFIG_ARCH_OMAP1
 346
 347 void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
 348 {
 349         int n = (timer - dm_timers) << 1;
 350         u32 l;
 351
 352         l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
 353         l |= source << n;
 354         omap_writel(l, MOD_CONF_CTRL_1);
 355 }
 356
 357 #else
 358
 359 void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
 360 {
 361         if (source < 0 || source >= 3)
 362                 return;
 363
 364         clk_disable(timer->fclk);
 365         clk_set_parent(timer->fclk, dm_source_clocks[source]);
 366         clk_enable(timer->fclk);
 367
 368         /* When the functional clock disappears, too quick writes seem to
 369          * cause an abort. */
 370         __delay(150000);
 371 }
 372
 373 #endif
 374
 375 void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
 376                             unsigned int load)
 377 {
 378         u32 l;
 379
 380         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 381         if (autoreload)
 382                 l |= OMAP_TIMER_CTRL_AR;
 383         else
 384                 l &= ~OMAP_TIMER_CTRL_AR;
 385         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 386         omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
 387         omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
 388 }
 389
 390 void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
 391                              unsigned int match)
 392 {
 393         u32 l;
 394
 395         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 396         if (enable)
 397                 l |= OMAP_TIMER_CTRL_CE;
 398         else
 399                 l &= ~OMAP_TIMER_CTRL_CE;
 400         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 401         omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
 402 }
 403
 404
 405 void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
 406                            int toggle, int trigger)
 407 {
 408         u32 l;
 409
 410         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 411         l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
 412                OMAP_TIMER_CTRL_PT | (0x03 << 10));
 413         if (def_on)
 414                 l |= OMAP_TIMER_CTRL_SCPWM;
 415         if (toggle)
 416                 l |= OMAP_TIMER_CTRL_PT;
 417         l |= trigger << 10;
 418         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 419 }
 420
 421 void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler)
 422 {
 423         u32 l;
 424
 425         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 426         l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
 427         if (prescaler >= 0x00 && prescaler <= 0x07) {
 428                 l |= OMAP_TIMER_CTRL_PRE;
 429                 l |= prescaler << 2;
 430         }
 431         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 432 }
 433
 434 void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
 435                                   unsigned int value)
 436 {
 437         omap_dm_timer_write_reg(timer, OMAP_TIMER_INT_EN_REG, value);
 438         omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG, value);
 439 }
 440
 441 unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
 442 {
 443         unsigned int l;
 444
 445         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_STAT_REG);
 446
 447         return l;
 448 }
 449
 450 void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
 451 {
 452         omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG, value);
 453 }
 454
 455 unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
 456 {
 457         unsigned int l;
 458
 459         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_COUNTER_REG);
 460
 461         return l;
 462 }
 463
 464 void omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value)
 465 {
 466         omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value);
 467 }
 468
 469 int omap_dm_timers_active(void)
 470 {
 471         int i;
 472
 473         for (i = 0; i < dm_timer_count; i++) {
 474                 struct omap_dm_timer *timer;
 475
 476                 timer = &dm_timers[i];
 477
 478                 if (!timer->enabled)
 479                         continue;
 480
 481                 if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
 482                     OMAP_TIMER_CTRL_ST) {
 483                         return 1;
 484                 }
 485         }
 486         return 0;
 487 }
 488
 489 int omap_dm_timer_init(void)
 490 {
 491         struct omap_dm_timer *timer;
 492         int i;
 493
 494         if (!(cpu_is_omap16xx() || cpu_is_omap24xx()))
 495                 return -ENODEV;
 496
 497         spin_lock_init(&dm_timer_lock);
 498 #ifdef CONFIG_ARCH_OMAP2
 499         for (i = 0; i < ARRAY_SIZE(dm_source_names); i++) {
 500                 dm_source_clocks[i] = clk_get(NULL, dm_source_names[i]);
 501                 BUG_ON(dm_source_clocks[i] == NULL);
 502         }
 503 #endif
 504         if (cpu_is_omap243x())
 505                 dm_timers[0].phys_base = 0x49018000;
 506
 507         for (i = 0; i < dm_timer_count; i++) {
 508 #ifdef CONFIG_ARCH_OMAP2
 509                 char clk_name[16];
 510 #endif
 511
 512                 timer = &dm_timers[i];
 513                 timer->io_base = (void __iomem *) io_p2v(timer->phys_base);
 514 #ifdef CONFIG_ARCH_OMAP2
 515                 sprintf(clk_name, "gpt%d_ick", i + 1);
 516                 timer->iclk = clk_get(NULL, clk_name);
 517                 sprintf(clk_name, "gpt%d_fck", i + 1);
 518                 timer->fclk = clk_get(NULL, clk_name);
 519 #endif
 520         }
 521
 522         return 0;
 523 }