arch/arm/plat-omap/include/plat/dmtimer.h

   1 /*
   2  * arch/arm/plat-omap/include/plat/dmtimer.h
   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  * Platform device conversion and hwmod support.
  11  *
  12  * Copyright (C) 2005 Nokia Corporation
  13  * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
  14  * PWM and clock framwork support by Timo Teras.
  15  *
  16  * This program is free software; you can redistribute it and/or modify it
  17  * under the terms of the GNU General Public License as published by the
  18  * Free Software Foundation; either version 2 of the License, or (at your
  19  * option) any later version.
  20  *
  21  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  22  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  23  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  24  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  * You should have received a copy of the  GNU General Public License along
  31  * with this program; if not, write  to the Free Software Foundation, Inc.,
  32  * 675 Mass Ave, Cambridge, MA 02139, USA.
  33  */
  34
  35 #include <linux/clk.h>
  36 #include <linux/delay.h>
  37 #include <linux/io.h>
  38 #include <linux/platform_device.h>
  39
  40 #ifndef __ASM_ARCH_DMTIMER_H
  41 #define __ASM_ARCH_DMTIMER_H
  42
  43 /* clock sources */
  44 #define OMAP_TIMER_SRC_SYS_CLK                  0x00
  45 #define OMAP_TIMER_SRC_32_KHZ                   0x01
  46 #define OMAP_TIMER_SRC_EXT_CLK                  0x02
  47
  48 /* timer interrupt enable bits */
  49 #define OMAP_TIMER_INT_CAPTURE                  (1 << 2)
  50 #define OMAP_TIMER_INT_OVERFLOW                 (1 << 1)
  51 #define OMAP_TIMER_INT_MATCH                    (1 << 0)
  52
  53 /* trigger types */
  54 #define OMAP_TIMER_TRIGGER_NONE                 0x00
  55 #define OMAP_TIMER_TRIGGER_OVERFLOW             0x01
  56 #define OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE 0x02
  57
  58 /* timer capabilities used in hwmod database */
  59 #define OMAP_TIMER_SECURE                               0x80000000
  60 #define OMAP_TIMER_ALWON                                0x40000000
  61 #define OMAP_TIMER_HAS_PWM                              0x20000000
  62 #define OMAP_TIMER_NEEDS_RESET                          0x10000000
  63
  64 struct omap_timer_capability_dev_attr {
  65         u32 timer_capability;
  66 };
  67
  68 struct omap_dm_timer;
  69
  70 struct timer_regs {
  71         u32 tidr;
  72         u32 tistat;
  73         u32 tisr;
  74         u32 tier;
  75         u32 twer;
  76         u32 tclr;
  77         u32 tcrr;
  78         u32 tldr;
  79         u32 ttrg;
  80         u32 twps;
  81         u32 tmar;
  82         u32 tcar1;
  83         u32 tsicr;
  84         u32 tcar2;
  85         u32 tpir;
  86         u32 tnir;
  87         u32 tcvr;
  88         u32 tocr;
  89         u32 towr;
  90 };
  91
  92 struct dmtimer_platform_data {
  93         int (*set_timer_src)(struct platform_device *pdev, int source);
  94         u32 timer_capability;
  95 };
  96
  97 int omap_dm_timer_reserve_systimer(int id);
  98 struct omap_dm_timer *omap_dm_timer_request(void);
  99 struct omap_dm_timer *omap_dm_timer_request_specific(int timer_id);
 100 int omap_dm_timer_free(struct omap_dm_timer *timer);
 101 void omap_dm_timer_enable(struct omap_dm_timer *timer);
 102 void omap_dm_timer_disable(struct omap_dm_timer *timer);
 103
 104 int omap_dm_timer_get_irq(struct omap_dm_timer *timer);
 105
 106 u32 omap_dm_timer_modify_idlect_mask(u32 inputmask);
 107 struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer);
 108
 109 int omap_dm_timer_trigger(struct omap_dm_timer *timer);
 110 int omap_dm_timer_start(struct omap_dm_timer *timer);
 111 int omap_dm_timer_stop(struct omap_dm_timer *timer);
 112
 113 int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source);
 114 int omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload, unsigned int value);
 115 int omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload, unsigned int value);
 116 int omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable, unsigned int match);
 117 int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on, int toggle, int trigger);
 118 int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler);
 119
 120 int omap_dm_timer_set_int_enable(struct omap_dm_timer *timer, unsigned int value);
 121
 122 unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer);
 123 int omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value);
 124 unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer);
 125 int omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value);
 126
 127 int omap_dm_timers_active(void);
 128
 129 /*
 130  * Do not use the defines below, they are not needed. They should be only
 131  * used by dmtimer.c and sys_timer related code.
 132  */
 133
 134 /*
 135  * The interrupt registers are different between v1 and v2 ip.
 136  * These registers are offsets from timer->iobase.
 137  */
 138 #define OMAP_TIMER_ID_OFFSET            0x00
 139 #define OMAP_TIMER_OCP_CFG_OFFSET       0x10
 140
 141 #define OMAP_TIMER_V1_SYS_STAT_OFFSET   0x14
 142 #define OMAP_TIMER_V1_STAT_OFFSET       0x18
 143 #define OMAP_TIMER_V1_INT_EN_OFFSET     0x1c
 144
 145 #define OMAP_TIMER_V2_IRQSTATUS_RAW     0x24
 146 #define OMAP_TIMER_V2_IRQSTATUS         0x28
 147 #define OMAP_TIMER_V2_IRQENABLE_SET     0x2c
 148 #define OMAP_TIMER_V2_IRQENABLE_CLR     0x30
 149
 150 /*
 151  * The functional registers have a different base on v1 and v2 ip.
 152  * These registers are offsets from timer->func_base. The func_base
 153  * is samae as io_base for v1 and io_base + 0x14 for v2 ip.
 154  *
 155  */
 156 #define OMAP_TIMER_V2_FUNC_OFFSET               0x14
 157
 158 #define _OMAP_TIMER_WAKEUP_EN_OFFSET    0x20
 159 #define _OMAP_TIMER_CTRL_OFFSET         0x24
 160 #define         OMAP_TIMER_CTRL_GPOCFG          (1 << 14)
 161 #define         OMAP_TIMER_CTRL_CAPTMODE        (1 << 13)
 162 #define         OMAP_TIMER_CTRL_PT              (1 << 12)
 163 #define         OMAP_TIMER_CTRL_TCM_LOWTOHIGH   (0x1 << 8)
 164 #define         OMAP_TIMER_CTRL_TCM_HIGHTOLOW   (0x2 << 8)
 165 #define         OMAP_TIMER_CTRL_TCM_BOTHEDGES   (0x3 << 8)
 166 #define         OMAP_TIMER_CTRL_SCPWM           (1 << 7)
 167 #define         OMAP_TIMER_CTRL_CE              (1 << 6) /* compare enable */
 168 #define         OMAP_TIMER_CTRL_PRE             (1 << 5) /* prescaler enable */
 169 #define         OMAP_TIMER_CTRL_PTV_SHIFT       2 /* prescaler value shift */
 170 #define         OMAP_TIMER_CTRL_POSTED          (1 << 2)
 171 #define         OMAP_TIMER_CTRL_AR              (1 << 1) /* auto-reload enable */
 172 #define         OMAP_TIMER_CTRL_ST              (1 << 0) /* start timer */
 173 #define _OMAP_TIMER_COUNTER_OFFSET      0x28
 174 #define _OMAP_TIMER_LOAD_OFFSET         0x2c
 175 #define _OMAP_TIMER_TRIGGER_OFFSET      0x30
 176 #define _OMAP_TIMER_WRITE_PEND_OFFSET   0x34
 177 #define         WP_NONE                 0       /* no write pending bit */
 178 #define         WP_TCLR                 (1 << 0)
 179 #define         WP_TCRR                 (1 << 1)
 180 #define         WP_TLDR                 (1 << 2)
 181 #define         WP_TTGR                 (1 << 3)
 182 #define         WP_TMAR                 (1 << 4)
 183 #define         WP_TPIR                 (1 << 5)
 184 #define         WP_TNIR                 (1 << 6)
 185 #define         WP_TCVR                 (1 << 7)
 186 #define         WP_TOCR                 (1 << 8)
 187 #define         WP_TOWR                 (1 << 9)
 188 #define _OMAP_TIMER_MATCH_OFFSET        0x38
 189 #define _OMAP_TIMER_CAPTURE_OFFSET      0x3c
 190 #define _OMAP_TIMER_IF_CTRL_OFFSET      0x40
 191 #define _OMAP_TIMER_CAPTURE2_OFFSET             0x44    /* TCAR2, 34xx only */
 192 #define _OMAP_TIMER_TICK_POS_OFFSET             0x48    /* TPIR, 34xx only */
 193 #define _OMAP_TIMER_TICK_NEG_OFFSET             0x4c    /* TNIR, 34xx only */
 194 #define _OMAP_TIMER_TICK_COUNT_OFFSET           0x50    /* TCVR, 34xx only */
 195 #define _OMAP_TIMER_TICK_INT_MASK_SET_OFFSET    0x54    /* TOCR, 34xx only */
 196 #define _OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET  0x58    /* TOWR, 34xx only */
 197
 198 /* register offsets with the write pending bit encoded */
 199 #define WPSHIFT                                 16
 200
 201 #define OMAP_TIMER_WAKEUP_EN_REG                (_OMAP_TIMER_WAKEUP_EN_OFFSET \
 202                                                         | (WP_NONE << WPSHIFT))
 203
 204 #define OMAP_TIMER_CTRL_REG                     (_OMAP_TIMER_CTRL_OFFSET \
 205                                                         | (WP_TCLR << WPSHIFT))
 206
 207 #define OMAP_TIMER_COUNTER_REG                  (_OMAP_TIMER_COUNTER_OFFSET \
 208                                                         | (WP_TCRR << WPSHIFT))
 209
 210 #define OMAP_TIMER_LOAD_REG                     (_OMAP_TIMER_LOAD_OFFSET \
 211                                                         | (WP_TLDR << WPSHIFT))
 212
 213 #define OMAP_TIMER_TRIGGER_REG                  (_OMAP_TIMER_TRIGGER_OFFSET \
 214                                                         | (WP_TTGR << WPSHIFT))
 215
 216 #define OMAP_TIMER_WRITE_PEND_REG               (_OMAP_TIMER_WRITE_PEND_OFFSET \
 217                                                         | (WP_NONE << WPSHIFT))
 218
 219 #define OMAP_TIMER_MATCH_REG                    (_OMAP_TIMER_MATCH_OFFSET \
 220                                                         | (WP_TMAR << WPSHIFT))
 221
 222 #define OMAP_TIMER_CAPTURE_REG                  (_OMAP_TIMER_CAPTURE_OFFSET \
 223                                                         | (WP_NONE << WPSHIFT))
 224
 225 #define OMAP_TIMER_IF_CTRL_REG                  (_OMAP_TIMER_IF_CTRL_OFFSET \
 226                                                         | (WP_NONE << WPSHIFT))
 227
 228 #define OMAP_TIMER_CAPTURE2_REG                 (_OMAP_TIMER_CAPTURE2_OFFSET \
 229                                                         | (WP_NONE << WPSHIFT))
 230
 231 #define OMAP_TIMER_TICK_POS_REG                 (_OMAP_TIMER_TICK_POS_OFFSET \
 232                                                         | (WP_TPIR << WPSHIFT))
 233
 234 #define OMAP_TIMER_TICK_NEG_REG                 (_OMAP_TIMER_TICK_NEG_OFFSET \
 235                                                         | (WP_TNIR << WPSHIFT))
 236
 237 #define OMAP_TIMER_TICK_COUNT_REG               (_OMAP_TIMER_TICK_COUNT_OFFSET \
 238                                                         | (WP_TCVR << WPSHIFT))
 239
 240 #define OMAP_TIMER_TICK_INT_MASK_SET_REG                                \
 241                 (_OMAP_TIMER_TICK_INT_MASK_SET_OFFSET | (WP_TOCR << WPSHIFT))
 242
 243 #define OMAP_TIMER_TICK_INT_MASK_COUNT_REG                              \
 244                 (_OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET | (WP_TOWR << WPSHIFT))
 245
 246 struct omap_dm_timer {
 247         unsigned long phys_base;
 248         int id;
 249         int irq;
 250         struct clk *fclk;
 251
 252         void __iomem    *io_base;
 253         void __iomem    *sys_stat;      /* TISTAT timer status */
 254         void __iomem    *irq_stat;      /* TISR/IRQSTATUS interrupt status */
 255         void __iomem    *irq_ena;       /* irq enable */
 256         void __iomem    *irq_dis;       /* irq disable, only on v2 ip */
 257         void __iomem    *pend;          /* write pending */
 258         void __iomem    *func_base;     /* function register base */
 259
 260         unsigned long rate;
 261         unsigned reserved:1;
 262         unsigned posted:1;
 263         struct timer_regs context;
 264         int ctx_loss_count;
 265         int revision;
 266         u32 capability;
 267         struct platform_device *pdev;
 268         struct list_head node;
 269 };
 270
 271 int omap_dm_timer_prepare(struct omap_dm_timer *timer);
 272
 273 static inline u32 __omap_dm_timer_read(struct omap_dm_timer *timer, u32 reg,
 274                                                 int posted)
 275 {
 276         if (posted)
 277                 while (__raw_readl(timer->pend) & (reg >> WPSHIFT))
 278                         cpu_relax();
 279
 280         return __raw_readl(timer->func_base + (reg & 0xff));
 281 }
 282
 283 static inline void __omap_dm_timer_write(struct omap_dm_timer *timer,
 284                                         u32 reg, u32 val, int posted)
 285 {
 286         if (posted)
 287                 while (__raw_readl(timer->pend) & (reg >> WPSHIFT))
 288                         cpu_relax();
 289
 290         __raw_writel(val, timer->func_base + (reg & 0xff));
 291 }
 292
 293 static inline void __omap_dm_timer_init_regs(struct omap_dm_timer *timer)
 294 {
 295         u32 tidr;
 296
 297         /* Assume v1 ip if bits [31:16] are zero */
 298         tidr = __raw_readl(timer->io_base);
 299         if (!(tidr >> 16)) {
 300                 timer->revision = 1;
 301                 timer->sys_stat = timer->io_base +
 302                                 OMAP_TIMER_V1_SYS_STAT_OFFSET;
 303                 timer->irq_stat = timer->io_base + OMAP_TIMER_V1_STAT_OFFSET;
 304                 timer->irq_ena = timer->io_base + OMAP_TIMER_V1_INT_EN_OFFSET;
 305                 timer->irq_dis = NULL;
 306                 timer->pend = timer->io_base + _OMAP_TIMER_WRITE_PEND_OFFSET;
 307                 timer->func_base = timer->io_base;
 308         } else {
 309                 timer->revision = 2;
 310                 timer->sys_stat = NULL;
 311                 timer->irq_stat = timer->io_base + OMAP_TIMER_V2_IRQSTATUS;
 312                 timer->irq_ena = timer->io_base + OMAP_TIMER_V2_IRQENABLE_SET;
 313                 timer->irq_dis = timer->io_base + OMAP_TIMER_V2_IRQENABLE_CLR;
 314                 timer->pend = timer->io_base +
 315                         _OMAP_TIMER_WRITE_PEND_OFFSET +
 316                                 OMAP_TIMER_V2_FUNC_OFFSET;
 317                 timer->func_base = timer->io_base + OMAP_TIMER_V2_FUNC_OFFSET;
 318         }
 319 }
 320
 321 /* Assumes the source clock has been set by caller */
 322 static inline void __omap_dm_timer_reset(struct omap_dm_timer *timer,
 323                                         int autoidle, int wakeup)
 324 {
 325         u32 l;
 326
 327         l = __raw_readl(timer->io_base + OMAP_TIMER_OCP_CFG_OFFSET);
 328         l |= 0x02 << 3;  /* Set to smart-idle mode */
 329         l |= 0x2 << 8;   /* Set clock activity to perserve f-clock on idle */
 330
 331         if (autoidle)
 332                 l |= 0x1 << 0;
 333
 334         if (wakeup)
 335                 l |= 1 << 2;
 336
 337         __raw_writel(l, timer->io_base + OMAP_TIMER_OCP_CFG_OFFSET);
 338
 339         /* Match hardware reset default of posted mode */
 340         __omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG,
 341                                         OMAP_TIMER_CTRL_POSTED, 0);
 342 }
 343
 344 static inline int __omap_dm_timer_set_source(struct clk *timer_fck,
 345                                                 struct clk *parent)
 346 {
 347         int ret;
 348
 349         clk_disable(timer_fck);
 350         ret = clk_set_parent(timer_fck, parent);
 351         clk_enable(timer_fck);
 352
 353         /*
 354          * When the functional clock disappears, too quick writes seem
 355          * to cause an abort. XXX Is this still necessary?
 356          */
 357         __delay(300000);
 358
 359         return ret;
 360 }
 361
 362 static inline void __omap_dm_timer_stop(struct omap_dm_timer *timer,
 363                                         int posted, unsigned long rate)
 364 {
 365         u32 l;
 366
 367         l = __omap_dm_timer_read(timer, OMAP_TIMER_CTRL_REG, posted);
 368         if (l & OMAP_TIMER_CTRL_ST) {
 369                 l &= ~0x1;
 370                 __omap_dm_timer_write(timer, OMAP_TIMER_CTRL_REG, l, posted);
 371 #ifdef CONFIG_ARCH_OMAP2PLUS
 372                 /* Readback to make sure write has completed */
 373                 __omap_dm_timer_read(timer, OMAP_TIMER_CTRL_REG, posted);
 374                 /*
 375                  * Wait for functional clock period x 3.5 to make sure that
 376                  * timer is stopped
 377                  */
 378                 udelay(3500000 / rate + 1);
 379 #endif
 380         }
 381
 382         /* Ack possibly pending interrupt */
 383         __raw_writel(OMAP_TIMER_INT_OVERFLOW, timer->irq_stat);
 384 }
 385
 386 static inline void __omap_dm_timer_load_start(struct omap_dm_timer *timer,
 387                                                 u32 ctrl, unsigned int load,
 388                                                 int posted)
 389 {
 390         __omap_dm_timer_write(timer, OMAP_TIMER_COUNTER_REG, load, posted);
 391         __omap_dm_timer_write(timer, OMAP_TIMER_CTRL_REG, ctrl, posted);
 392 }
 393
 394 static inline void __omap_dm_timer_int_enable(struct omap_dm_timer *timer,
 395                                                 unsigned int value)
 396 {
 397         __raw_writel(value, timer->irq_ena);
 398         __omap_dm_timer_write(timer, OMAP_TIMER_WAKEUP_EN_REG, value, 0);
 399 }
 400
 401 static inline unsigned int
 402 __omap_dm_timer_read_counter(struct omap_dm_timer *timer, int posted)
 403 {
 404         return __omap_dm_timer_read(timer, OMAP_TIMER_COUNTER_REG, posted);
 405 }
 406
 407 static inline void __omap_dm_timer_write_status(struct omap_dm_timer *timer,
 408                                                 unsigned int value)
 409 {
 410         __raw_writel(value, timer->irq_stat);
 411 }
 412
 413 #endif /* __ASM_ARCH_DMTIMER_H */