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 #define BFIN_TIMER_NUM_GROUP  (BFIN_TIMER_OCTET(MAX_BLACKFIN_GPTIMERS - 1) + 1)
  27
  28 typedef struct {
  29         uint16_t config;
  30         uint16_t __pad;
  31         uint32_t counter;
  32         uint32_t period;
  33         uint32_t width;
  34 } GPTIMER_timer_regs;
  35
  36 typedef struct {
  37         uint16_t enable;
  38         uint16_t __pad0;
  39         uint16_t disable;
  40         uint16_t __pad1;
  41         uint32_t status;
  42 } GPTIMER_group_regs;
  43
  44 static volatile GPTIMER_timer_regs *const timer_regs[MAX_BLACKFIN_GPTIMERS] =
  45 {
  46         (GPTIMER_timer_regs *)TIMER0_CONFIG,
  47         (GPTIMER_timer_regs *)TIMER1_CONFIG,
  48         (GPTIMER_timer_regs *)TIMER2_CONFIG,
  49 #if (MAX_BLACKFIN_GPTIMERS > 3)
  50         (GPTIMER_timer_regs *)TIMER3_CONFIG,
  51         (GPTIMER_timer_regs *)TIMER4_CONFIG,
  52         (GPTIMER_timer_regs *)TIMER5_CONFIG,
  53         (GPTIMER_timer_regs *)TIMER6_CONFIG,
  54         (GPTIMER_timer_regs *)TIMER7_CONFIG,
  55 # if (MAX_BLACKFIN_GPTIMERS > 8)
  56         (GPTIMER_timer_regs *)TIMER8_CONFIG,
  57         (GPTIMER_timer_regs *)TIMER9_CONFIG,
  58         (GPTIMER_timer_regs *)TIMER10_CONFIG,
  59 #  if (MAX_BLACKFIN_GPTIMERS > 11)
  60         (GPTIMER_timer_regs *)TIMER11_CONFIG,
  61 #  endif
  62 # endif
  63 #endif
  64 };
  65
  66 static volatile GPTIMER_group_regs *const group_regs[BFIN_TIMER_NUM_GROUP] =
  67 {
  68         (GPTIMER_group_regs *)TIMER0_GROUP_REG,
  69 #if (MAX_BLACKFIN_GPTIMERS > 8)
  70         (GPTIMER_group_regs *)TIMER8_GROUP_REG,
  71 #endif
  72 };
  73
  74 static uint32_t const trun_mask[MAX_BLACKFIN_GPTIMERS] =
  75 {
  76         TIMER_STATUS_TRUN0,
  77         TIMER_STATUS_TRUN1,
  78         TIMER_STATUS_TRUN2,
  79 #if (MAX_BLACKFIN_GPTIMERS > 3)
  80         TIMER_STATUS_TRUN3,
  81         TIMER_STATUS_TRUN4,
  82         TIMER_STATUS_TRUN5,
  83         TIMER_STATUS_TRUN6,
  84         TIMER_STATUS_TRUN7,
  85 # if (MAX_BLACKFIN_GPTIMERS > 8)
  86         TIMER_STATUS_TRUN8,
  87         TIMER_STATUS_TRUN9,
  88         TIMER_STATUS_TRUN10,
  89 #  if (MAX_BLACKFIN_GPTIMERS > 11)
  90         TIMER_STATUS_TRUN11,
  91 #  endif
  92 # endif
  93 #endif
  94 };
  95
  96 static uint32_t const tovf_mask[MAX_BLACKFIN_GPTIMERS] =
  97 {
  98         TIMER_STATUS_TOVF0,
  99         TIMER_STATUS_TOVF1,
 100         TIMER_STATUS_TOVF2,
 101 #if (MAX_BLACKFIN_GPTIMERS > 3)
 102         TIMER_STATUS_TOVF3,
 103         TIMER_STATUS_TOVF4,
 104         TIMER_STATUS_TOVF5,
 105         TIMER_STATUS_TOVF6,
 106         TIMER_STATUS_TOVF7,
 107 # if (MAX_BLACKFIN_GPTIMERS > 8)
 108         TIMER_STATUS_TOVF8,
 109         TIMER_STATUS_TOVF9,
 110         TIMER_STATUS_TOVF10,
 111 #  if (MAX_BLACKFIN_GPTIMERS > 11)
 112         TIMER_STATUS_TOVF11,
 113 #  endif
 114 # endif
 115 #endif
 116 };
 117
 118 static uint32_t const timil_mask[MAX_BLACKFIN_GPTIMERS] =
 119 {
 120         TIMER_STATUS_TIMIL0,
 121         TIMER_STATUS_TIMIL1,
 122         TIMER_STATUS_TIMIL2,
 123 #if (MAX_BLACKFIN_GPTIMERS > 3)
 124         TIMER_STATUS_TIMIL3,
 125         TIMER_STATUS_TIMIL4,
 126         TIMER_STATUS_TIMIL5,
 127         TIMER_STATUS_TIMIL6,
 128         TIMER_STATUS_TIMIL7,
 129 # if (MAX_BLACKFIN_GPTIMERS > 8)
 130         TIMER_STATUS_TIMIL8,
 131         TIMER_STATUS_TIMIL9,
 132         TIMER_STATUS_TIMIL10,
 133 #  if (MAX_BLACKFIN_GPTIMERS > 11)
 134         TIMER_STATUS_TIMIL11,
 135 #  endif
 136 # endif
 137 #endif
 138 };
 139
 140 void set_gptimer_pwidth(int timer_id, uint32_t value)
 141 {
 142         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 143         timer_regs[timer_id]->width = value;
 144         SSYNC();
 145 }
 146 EXPORT_SYMBOL(set_gptimer_pwidth);
 147
 148 uint32_t get_gptimer_pwidth(int timer_id)
 149 {
 150         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 151         return timer_regs[timer_id]->width;
 152 }
 153 EXPORT_SYMBOL(get_gptimer_pwidth);
 154
 155 void set_gptimer_period(int timer_id, uint32_t period)
 156 {
 157         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 158         timer_regs[timer_id]->period = period;
 159         SSYNC();
 160 }
 161 EXPORT_SYMBOL(set_gptimer_period);
 162
 163 uint32_t get_gptimer_period(int timer_id)
 164 {
 165         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 166         return timer_regs[timer_id]->period;
 167 }
 168 EXPORT_SYMBOL(get_gptimer_period);
 169
 170 uint32_t get_gptimer_count(int timer_id)
 171 {
 172         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 173         return timer_regs[timer_id]->counter;
 174 }
 175 EXPORT_SYMBOL(get_gptimer_count);
 176
 177 uint32_t get_gptimer_status(int group)
 178 {
 179         tassert(group < BFIN_TIMER_NUM_GROUP);
 180         return group_regs[group]->status;
 181 }
 182 EXPORT_SYMBOL(get_gptimer_status);
 183
 184 void set_gptimer_status(int group, uint32_t value)
 185 {
 186         tassert(group < BFIN_TIMER_NUM_GROUP);
 187         group_regs[group]->status = value;
 188         SSYNC();
 189 }
 190 EXPORT_SYMBOL(set_gptimer_status);
 191
 192 uint16_t get_gptimer_intr(int timer_id)
 193 {
 194         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 195         return (group_regs[BFIN_TIMER_OCTET(timer_id)]->status & timil_mask[timer_id]) ? 1 : 0;
 196 }
 197 EXPORT_SYMBOL(get_gptimer_intr);
 198
 199 void clear_gptimer_intr(int timer_id)
 200 {
 201         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 202         group_regs[BFIN_TIMER_OCTET(timer_id)]->status = timil_mask[timer_id];
 203 }
 204 EXPORT_SYMBOL(clear_gptimer_intr);
 205
 206 uint16_t get_gptimer_over(int timer_id)
 207 {
 208         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 209         return (group_regs[BFIN_TIMER_OCTET(timer_id)]->status & tovf_mask[timer_id]) ? 1 : 0;
 210 }
 211 EXPORT_SYMBOL(get_gptimer_over);
 212
 213 void clear_gptimer_over(int timer_id)
 214 {
 215         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 216         group_regs[BFIN_TIMER_OCTET(timer_id)]->status = tovf_mask[timer_id];
 217 }
 218 EXPORT_SYMBOL(clear_gptimer_over);
 219
 220 void set_gptimer_config(int timer_id, uint16_t config)
 221 {
 222         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 223         timer_regs[timer_id]->config = config;
 224         SSYNC();
 225 }
 226 EXPORT_SYMBOL(set_gptimer_config);
 227
 228 uint16_t get_gptimer_config(int timer_id)
 229 {
 230         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 231         return timer_regs[timer_id]->config;
 232 }
 233 EXPORT_SYMBOL(get_gptimer_config);
 234
 235 void enable_gptimers(uint16_t mask)
 236 {
 237         int i;
 238         tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
 239         for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
 240                 group_regs[i]->enable = mask & 0xFF;
 241                 mask >>= 8;
 242         }
 243         SSYNC();
 244 }
 245 EXPORT_SYMBOL(enable_gptimers);
 246
 247 void disable_gptimers(uint16_t mask)
 248 {
 249         int i;
 250         uint16_t m = mask;
 251         tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
 252         for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
 253                 group_regs[i]->disable = m & 0xFF;
 254                 m >>= 8;
 255         }
 256         for (i = 0; i < MAX_BLACKFIN_GPTIMERS; ++i)
 257                 if (mask & (1 << i))
 258                         group_regs[BFIN_TIMER_OCTET(i)]->status |= trun_mask[i];
 259         SSYNC();
 260 }
 261 EXPORT_SYMBOL(disable_gptimers);
 262
 263 void set_gptimer_pulse_hi(int timer_id)
 264 {
 265         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 266         timer_regs[timer_id]->config |= TIMER_PULSE_HI;
 267         SSYNC();
 268 }
 269 EXPORT_SYMBOL(set_gptimer_pulse_hi);
 270
 271 void clear_gptimer_pulse_hi(int timer_id)
 272 {
 273         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 274         timer_regs[timer_id]->config &= ~TIMER_PULSE_HI;
 275         SSYNC();
 276 }
 277 EXPORT_SYMBOL(clear_gptimer_pulse_hi);
 278
 279 uint16_t get_enabled_gptimers(void)
 280 {
 281         int i;
 282         uint16_t result = 0;
 283         for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i)
 284                 result |= (group_regs[i]->enable << (i << 3));
 285         return result;
 286 }
 287 EXPORT_SYMBOL(get_enabled_gptimers);
 288
 289 MODULE_AUTHOR("Axel Weiss (awe@aglaia-gmbh.de)");
 290 MODULE_DESCRIPTION("Blackfin General Purpose Timers API");
 291 MODULE_LICENSE("GPL");