arch/blackfin/kernel/gptimers.c

   1 /*
   2  * gptimers.c - Blackfin General Purpose Timer core API
   3  *
   4  * Copyright (c) 2005-2008 Analog Devices Inc.
   5  * Copyright (C) 2005 John DeHority
   6  * Copyright (C) 2006 Hella Aglaia GmbH (awe@aglaia-gmbh.de)
   7  *
   8  * Licensed under the GPLv2.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/io.h>
  14
  15 #include <asm/blackfin.h>
  16 #include <asm/gptimers.h>
  17
  18 #ifdef DEBUG
  19 # define tassert(expr)
  20 #else
  21 # define tassert(expr) \
  22         if (!(expr)) \
  23                 printk(KERN_DEBUG "%s:%s:%i: Assertion failed: " #expr "\n", __FILE__, __func__, __LINE__);
  24 #endif
  25
  26 #ifndef CONFIG_BF60x
  27 # define BFIN_TIMER_NUM_GROUP  (BFIN_TIMER_OCTET(MAX_BLACKFIN_GPTIMERS - 1) + 1)
  28 #else
  29 # define BFIN_TIMER_NUM_GROUP  1
  30 #endif
  31
  32 static struct bfin_gptimer_regs * const timer_regs[MAX_BLACKFIN_GPTIMERS] =
  33 {
  34         (void *)TIMER0_CONFIG,
  35         (void *)TIMER1_CONFIG,
  36         (void *)TIMER2_CONFIG,
  37 #if (MAX_BLACKFIN_GPTIMERS > 3)
  38         (void *)TIMER3_CONFIG,
  39         (void *)TIMER4_CONFIG,
  40         (void *)TIMER5_CONFIG,
  41         (void *)TIMER6_CONFIG,
  42         (void *)TIMER7_CONFIG,
  43 # if (MAX_BLACKFIN_GPTIMERS > 8)
  44         (void *)TIMER8_CONFIG,
  45         (void *)TIMER9_CONFIG,
  46         (void *)TIMER10_CONFIG,
  47 #  if (MAX_BLACKFIN_GPTIMERS > 11)
  48         (void *)TIMER11_CONFIG,
  49 #  endif
  50 # endif
  51 #endif
  52 };
  53
  54 static struct bfin_gptimer_group_regs * const group_regs[BFIN_TIMER_NUM_GROUP] =
  55 {
  56         (void *)TIMER0_GROUP_REG,
  57 #if (MAX_BLACKFIN_GPTIMERS > 8)
  58         (void *)TIMER8_GROUP_REG,
  59 #endif
  60 };
  61
  62 static uint32_t const trun_mask[MAX_BLACKFIN_GPTIMERS] =
  63 {
  64         TIMER_STATUS_TRUN0,
  65         TIMER_STATUS_TRUN1,
  66         TIMER_STATUS_TRUN2,
  67 #if (MAX_BLACKFIN_GPTIMERS > 3)
  68         TIMER_STATUS_TRUN3,
  69         TIMER_STATUS_TRUN4,
  70         TIMER_STATUS_TRUN5,
  71         TIMER_STATUS_TRUN6,
  72         TIMER_STATUS_TRUN7,
  73 # if (MAX_BLACKFIN_GPTIMERS > 8)
  74         TIMER_STATUS_TRUN8,
  75         TIMER_STATUS_TRUN9,
  76         TIMER_STATUS_TRUN10,
  77 #  if (MAX_BLACKFIN_GPTIMERS > 11)
  78         TIMER_STATUS_TRUN11,
  79 #  endif
  80 # endif
  81 #endif
  82 };
  83
  84 static uint32_t const tovf_mask[MAX_BLACKFIN_GPTIMERS] =
  85 {
  86         TIMER_STATUS_TOVF0,
  87         TIMER_STATUS_TOVF1,
  88         TIMER_STATUS_TOVF2,
  89 #if (MAX_BLACKFIN_GPTIMERS > 3)
  90         TIMER_STATUS_TOVF3,
  91         TIMER_STATUS_TOVF4,
  92         TIMER_STATUS_TOVF5,
  93         TIMER_STATUS_TOVF6,
  94         TIMER_STATUS_TOVF7,
  95 # if (MAX_BLACKFIN_GPTIMERS > 8)
  96         TIMER_STATUS_TOVF8,
  97         TIMER_STATUS_TOVF9,
  98         TIMER_STATUS_TOVF10,
  99 #  if (MAX_BLACKFIN_GPTIMERS > 11)
 100         TIMER_STATUS_TOVF11,
 101 #  endif
 102 # endif
 103 #endif
 104 };
 105
 106 static uint32_t const timil_mask[MAX_BLACKFIN_GPTIMERS] =
 107 {
 108         TIMER_STATUS_TIMIL0,
 109         TIMER_STATUS_TIMIL1,
 110         TIMER_STATUS_TIMIL2,
 111 #if (MAX_BLACKFIN_GPTIMERS > 3)
 112         TIMER_STATUS_TIMIL3,
 113         TIMER_STATUS_TIMIL4,
 114         TIMER_STATUS_TIMIL5,
 115         TIMER_STATUS_TIMIL6,
 116         TIMER_STATUS_TIMIL7,
 117 # if (MAX_BLACKFIN_GPTIMERS > 8)
 118         TIMER_STATUS_TIMIL8,
 119         TIMER_STATUS_TIMIL9,
 120         TIMER_STATUS_TIMIL10,
 121 #  if (MAX_BLACKFIN_GPTIMERS > 11)
 122         TIMER_STATUS_TIMIL11,
 123 #  endif
 124 # endif
 125 #endif
 126 };
 127
 128 void set_gptimer_pwidth(unsigned int timer_id, uint32_t value)
 129 {
 130         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 131         bfin_write(&timer_regs[timer_id]->width, value);
 132         SSYNC();
 133 }
 134 EXPORT_SYMBOL(set_gptimer_pwidth);
 135
 136 uint32_t get_gptimer_pwidth(unsigned int timer_id)
 137 {
 138         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 139         return bfin_read(&timer_regs[timer_id]->width);
 140 }
 141 EXPORT_SYMBOL(get_gptimer_pwidth);
 142
 143 void set_gptimer_period(unsigned int timer_id, uint32_t period)
 144 {
 145         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 146         bfin_write(&timer_regs[timer_id]->period, period);
 147         SSYNC();
 148 }
 149 EXPORT_SYMBOL(set_gptimer_period);
 150
 151 uint32_t get_gptimer_period(unsigned int timer_id)
 152 {
 153         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 154         return bfin_read(&timer_regs[timer_id]->period);
 155 }
 156 EXPORT_SYMBOL(get_gptimer_period);
 157
 158 uint32_t get_gptimer_count(unsigned int timer_id)
 159 {
 160         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 161         return bfin_read(&timer_regs[timer_id]->counter);
 162 }
 163 EXPORT_SYMBOL(get_gptimer_count);
 164
 165 #ifdef CONFIG_BF60x
 166 void set_gptimer_delay(unsigned int timer_id, uint32_t delay)
 167 {
 168         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 169         bfin_write(&timer_regs[timer_id]->delay, delay);
 170         SSYNC();
 171 }
 172 EXPORT_SYMBOL(set_gptimer_delay);
 173
 174 uint32_t get_gptimer_delay(unsigned int timer_id)
 175 {
 176         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 177         return bfin_read(&timer_regs[timer_id]->delay);
 178 }
 179 EXPORT_SYMBOL(get_gptimer_delay);
 180 #endif
 181
 182 #ifdef CONFIG_BF60x
 183 int get_gptimer_intr(unsigned int timer_id)
 184 {
 185         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 186         return !!(bfin_read(&group_regs[BFIN_TIMER_OCTET(timer_id)]->data_ilat) & timil_mask[timer_id]);
 187 }
 188 EXPORT_SYMBOL(get_gptimer_intr);
 189
 190 void clear_gptimer_intr(unsigned int timer_id)
 191 {
 192         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 193         bfin_write(&group_regs[BFIN_TIMER_OCTET(timer_id)]->data_ilat, timil_mask[timer_id]);
 194 }
 195 EXPORT_SYMBOL(clear_gptimer_intr);
 196
 197 int get_gptimer_over(unsigned int timer_id)
 198 {
 199         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 200         return !!(bfin_read(&group_regs[BFIN_TIMER_OCTET(timer_id)]->stat_ilat) & tovf_mask[timer_id]);
 201 }
 202 EXPORT_SYMBOL(get_gptimer_over);
 203
 204 void clear_gptimer_over(unsigned int timer_id)
 205 {
 206         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 207         bfin_write(&group_regs[BFIN_TIMER_OCTET(timer_id)]->stat_ilat, tovf_mask[timer_id]);
 208 }
 209 EXPORT_SYMBOL(clear_gptimer_over);
 210
 211 int get_gptimer_run(unsigned int timer_id)
 212 {
 213         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 214         return !!(bfin_read(&group_regs[BFIN_TIMER_OCTET(timer_id)]->run) & trun_mask[timer_id]);
 215 }
 216 EXPORT_SYMBOL(get_gptimer_run);
 217
 218 uint32_t get_gptimer_status(unsigned int group)
 219 {
 220         tassert(group < BFIN_TIMER_NUM_GROUP);
 221         return bfin_read(&group_regs[group]->data_ilat);
 222 }
 223 EXPORT_SYMBOL(get_gptimer_status);
 224
 225 void set_gptimer_status(unsigned int group, uint32_t value)
 226 {
 227         tassert(group < BFIN_TIMER_NUM_GROUP);
 228         bfin_write(&group_regs[group]->data_ilat, value);
 229         SSYNC();
 230 }
 231 EXPORT_SYMBOL(set_gptimer_status);
 232 #else
 233 uint32_t get_gptimer_status(unsigned int group)
 234 {
 235         tassert(group < BFIN_TIMER_NUM_GROUP);
 236         return bfin_read(&group_regs[group]->status);
 237 }
 238 EXPORT_SYMBOL(get_gptimer_status);
 239
 240 void set_gptimer_status(unsigned int group, uint32_t value)
 241 {
 242         tassert(group < BFIN_TIMER_NUM_GROUP);
 243         bfin_write(&group_regs[group]->status, value);
 244         SSYNC();
 245 }
 246 EXPORT_SYMBOL(set_gptimer_status);
 247
 248 static uint32_t read_gptimer_status(unsigned int timer_id)
 249 {
 250         return bfin_read(&group_regs[BFIN_TIMER_OCTET(timer_id)]->status);
 251 }
 252
 253 int get_gptimer_intr(unsigned int timer_id)
 254 {
 255         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 256         return !!(read_gptimer_status(timer_id) & timil_mask[timer_id]);
 257 }
 258 EXPORT_SYMBOL(get_gptimer_intr);
 259
 260 void clear_gptimer_intr(unsigned int timer_id)
 261 {
 262         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 263         bfin_write(&group_regs[BFIN_TIMER_OCTET(timer_id)]->status, timil_mask[timer_id]);
 264 }
 265 EXPORT_SYMBOL(clear_gptimer_intr);
 266
 267 int get_gptimer_over(unsigned int timer_id)
 268 {
 269         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 270         return !!(read_gptimer_status(timer_id) & tovf_mask[timer_id]);
 271 }
 272 EXPORT_SYMBOL(get_gptimer_over);
 273
 274 void clear_gptimer_over(unsigned int timer_id)
 275 {
 276         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 277         bfin_write(&group_regs[BFIN_TIMER_OCTET(timer_id)]->status, tovf_mask[timer_id]);
 278 }
 279 EXPORT_SYMBOL(clear_gptimer_over);
 280
 281 int get_gptimer_run(unsigned int timer_id)
 282 {
 283         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 284         return !!(read_gptimer_status(timer_id) & trun_mask[timer_id]);
 285 }
 286 EXPORT_SYMBOL(get_gptimer_run);
 287 #endif
 288
 289 void set_gptimer_config(unsigned int timer_id, uint16_t config)
 290 {
 291         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 292         bfin_write(&timer_regs[timer_id]->config, config);
 293         SSYNC();
 294 }
 295 EXPORT_SYMBOL(set_gptimer_config);
 296
 297 uint16_t get_gptimer_config(unsigned int timer_id)
 298 {
 299         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 300         return bfin_read(&timer_regs[timer_id]->config);
 301 }
 302 EXPORT_SYMBOL(get_gptimer_config);
 303
 304 void enable_gptimers(uint16_t mask)
 305 {
 306         int i;
 307 #ifdef CONFIG_BF60x
 308         uint16_t imask;
 309         imask = bfin_read16(TIMER_DATA_IMSK);
 310         imask &= ~mask;
 311         bfin_write16(TIMER_DATA_IMSK, imask);
 312 #endif
 313         tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
 314         for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
 315                 bfin_write(&group_regs[i]->enable, mask & 0xFF);
 316                 mask >>= 8;
 317         }
 318         SSYNC();
 319 }
 320 EXPORT_SYMBOL(enable_gptimers);
 321
 322 static void _disable_gptimers(uint16_t mask)
 323 {
 324         int i;
 325         uint16_t m = mask;
 326         tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
 327         for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
 328                 bfin_write(&group_regs[i]->disable, m & 0xFF);
 329                 m >>= 8;
 330         }
 331 }
 332
 333 void disable_gptimers(uint16_t mask)
 334 {
 335 #ifndef CONFIG_BF60x
 336         int i;
 337         _disable_gptimers(mask);
 338         for (i = 0; i < MAX_BLACKFIN_GPTIMERS; ++i)
 339                 if (mask & (1 << i))
 340                         bfin_write(&group_regs[BFIN_TIMER_OCTET(i)]->status, trun_mask[i]);
 341         SSYNC();
 342 #else
 343         _disable_gptimers(mask);
 344 #endif
 345 }
 346 EXPORT_SYMBOL(disable_gptimers);
 347
 348 void disable_gptimers_sync(uint16_t mask)
 349 {
 350         _disable_gptimers(mask);
 351         SSYNC();
 352 }
 353 EXPORT_SYMBOL(disable_gptimers_sync);
 354
 355 void set_gptimer_pulse_hi(unsigned int timer_id)
 356 {
 357         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 358         bfin_write_or(&timer_regs[timer_id]->config, TIMER_PULSE_HI);
 359         SSYNC();
 360 }
 361 EXPORT_SYMBOL(set_gptimer_pulse_hi);
 362
 363 void clear_gptimer_pulse_hi(unsigned int timer_id)
 364 {
 365         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 366         bfin_write_and(&timer_regs[timer_id]->config, ~TIMER_PULSE_HI);
 367         SSYNC();
 368 }
 369 EXPORT_SYMBOL(clear_gptimer_pulse_hi);
 370
 371 uint16_t get_enabled_gptimers(void)
 372 {
 373         int i;
 374         uint16_t result = 0;
 375         for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i)
 376                 result |= (bfin_read(&group_regs[i]->enable) << (i << 3));
 377         return result;
 378 }
 379 EXPORT_SYMBOL(get_enabled_gptimers);
 380
 381 MODULE_AUTHOR("Axel Weiss (awe@aglaia-gmbh.de)");
 382 MODULE_DESCRIPTION("Blackfin General Purpose Timers API");
 383 MODULE_LICENSE("GPL");