arch/blackfin/kernel/gptimers.c

   1 /*
   2  * bfin_gptimers.c - derived from bf53x_timers.c
   3  *  Driver for General Purpose Timer functions on the Blackfin processor
   4  *
   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
  14 #include <asm/io.h>
  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 #endif
  56 #if (MAX_BLACKFIN_GPTIMERS > 8)
  57         (GPTIMER_timer_regs *)TIMER8_CONFIG,
  58         (GPTIMER_timer_regs *)TIMER9_CONFIG,
  59         (GPTIMER_timer_regs *)TIMER10_CONFIG,
  60         (GPTIMER_timer_regs *)TIMER11_CONFIG,
  61 #endif
  62 };
  63
  64 static volatile GPTIMER_group_regs *const group_regs[BFIN_TIMER_NUM_GROUP] =
  65 {
  66         (GPTIMER_group_regs *)TIMER0_GROUP_REG,
  67 #if (MAX_BLACKFIN_GPTIMERS > 8)
  68         (GPTIMER_group_regs *)TIMER8_GROUP_REG,
  69 #endif
  70 };
  71
  72 static uint32_t const trun_mask[MAX_BLACKFIN_GPTIMERS] =
  73 {
  74         TIMER_STATUS_TRUN0,
  75         TIMER_STATUS_TRUN1,
  76         TIMER_STATUS_TRUN2,
  77 #if (MAX_BLACKFIN_GPTIMERS > 3)
  78         TIMER_STATUS_TRUN3,
  79         TIMER_STATUS_TRUN4,
  80         TIMER_STATUS_TRUN5,
  81         TIMER_STATUS_TRUN6,
  82         TIMER_STATUS_TRUN7,
  83 #endif
  84 #if (MAX_BLACKFIN_GPTIMERS > 8)
  85         TIMER_STATUS_TRUN8,
  86         TIMER_STATUS_TRUN9,
  87         TIMER_STATUS_TRUN10,
  88         TIMER_STATUS_TRUN11,
  89 #endif
  90 };
  91
  92 static uint32_t const tovf_mask[MAX_BLACKFIN_GPTIMERS] =
  93 {
  94         TIMER_STATUS_TOVF0,
  95         TIMER_STATUS_TOVF1,
  96         TIMER_STATUS_TOVF2,
  97 #if (MAX_BLACKFIN_GPTIMERS > 3)
  98         TIMER_STATUS_TOVF3,
  99         TIMER_STATUS_TOVF4,
 100         TIMER_STATUS_TOVF5,
 101         TIMER_STATUS_TOVF6,
 102         TIMER_STATUS_TOVF7,
 103 #endif
 104 #if (MAX_BLACKFIN_GPTIMERS > 8)
 105         TIMER_STATUS_TOVF8,
 106         TIMER_STATUS_TOVF9,
 107         TIMER_STATUS_TOVF10,
 108         TIMER_STATUS_TOVF11,
 109 #endif
 110 };
 111
 112 static uint32_t const timil_mask[MAX_BLACKFIN_GPTIMERS] =
 113 {
 114         TIMER_STATUS_TIMIL0,
 115         TIMER_STATUS_TIMIL1,
 116         TIMER_STATUS_TIMIL2,
 117 #if (MAX_BLACKFIN_GPTIMERS > 3)
 118         TIMER_STATUS_TIMIL3,
 119         TIMER_STATUS_TIMIL4,
 120         TIMER_STATUS_TIMIL5,
 121         TIMER_STATUS_TIMIL6,
 122         TIMER_STATUS_TIMIL7,
 123 #endif
 124 #if (MAX_BLACKFIN_GPTIMERS > 8)
 125         TIMER_STATUS_TIMIL8,
 126         TIMER_STATUS_TIMIL9,
 127         TIMER_STATUS_TIMIL10,
 128         TIMER_STATUS_TIMIL11,
 129 #endif
 130 };
 131
 132 void set_gptimer_pwidth(int timer_id, uint32_t value)
 133 {
 134         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 135         timer_regs[timer_id]->width = value;
 136         SSYNC();
 137 }
 138 EXPORT_SYMBOL(set_gptimer_pwidth);
 139
 140 uint32_t get_gptimer_pwidth(int timer_id)
 141 {
 142         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 143         return timer_regs[timer_id]->width;
 144 }
 145 EXPORT_SYMBOL(get_gptimer_pwidth);
 146
 147 void set_gptimer_period(int timer_id, uint32_t period)
 148 {
 149         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 150         timer_regs[timer_id]->period = period;
 151         SSYNC();
 152 }
 153 EXPORT_SYMBOL(set_gptimer_period);
 154
 155 uint32_t get_gptimer_period(int timer_id)
 156 {
 157         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 158         return timer_regs[timer_id]->period;
 159 }
 160 EXPORT_SYMBOL(get_gptimer_period);
 161
 162 uint32_t get_gptimer_count(int timer_id)
 163 {
 164         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 165         return timer_regs[timer_id]->counter;
 166 }
 167 EXPORT_SYMBOL(get_gptimer_count);
 168
 169 uint32_t get_gptimer_status(int group)
 170 {
 171         tassert(group < BFIN_TIMER_NUM_GROUP);
 172         return group_regs[group]->status;
 173 }
 174 EXPORT_SYMBOL(get_gptimer_status);
 175
 176 void set_gptimer_status(int group, uint32_t value)
 177 {
 178         tassert(group < BFIN_TIMER_NUM_GROUP);
 179         group_regs[group]->status = value;
 180         SSYNC();
 181 }
 182 EXPORT_SYMBOL(set_gptimer_status);
 183
 184 uint16_t get_gptimer_intr(int timer_id)
 185 {
 186         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 187         return (group_regs[BFIN_TIMER_OCTET(timer_id)]->status & timil_mask[timer_id]) ? 1 : 0;
 188 }
 189 EXPORT_SYMBOL(get_gptimer_intr);
 190
 191 void clear_gptimer_intr(int timer_id)
 192 {
 193         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 194         group_regs[BFIN_TIMER_OCTET(timer_id)]->status = timil_mask[timer_id];
 195 }
 196 EXPORT_SYMBOL(clear_gptimer_intr);
 197
 198 uint16_t get_gptimer_over(int timer_id)
 199 {
 200         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 201         return (group_regs[BFIN_TIMER_OCTET(timer_id)]->status & tovf_mask[timer_id]) ? 1 : 0;
 202 }
 203 EXPORT_SYMBOL(get_gptimer_over);
 204
 205 void clear_gptimer_over(int timer_id)
 206 {
 207         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 208         group_regs[BFIN_TIMER_OCTET(timer_id)]->status = tovf_mask[timer_id];
 209 }
 210 EXPORT_SYMBOL(clear_gptimer_over);
 211
 212 void set_gptimer_config(int timer_id, uint16_t config)
 213 {
 214         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 215         timer_regs[timer_id]->config = config;
 216         SSYNC();
 217 }
 218 EXPORT_SYMBOL(set_gptimer_config);
 219
 220 uint16_t get_gptimer_config(int timer_id)
 221 {
 222         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 223         return timer_regs[timer_id]->config;
 224 }
 225 EXPORT_SYMBOL(get_gptimer_config);
 226
 227 void enable_gptimers(uint16_t mask)
 228 {
 229         int i;
 230         tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
 231         for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
 232                 group_regs[i]->enable = mask & 0xFF;
 233                 mask >>= 8;
 234         }
 235         SSYNC();
 236 }
 237 EXPORT_SYMBOL(enable_gptimers);
 238
 239 void disable_gptimers(uint16_t mask)
 240 {
 241         int i;
 242         uint16_t m = mask;
 243         tassert((mask & ~BLACKFIN_GPTIMER_IDMASK) == 0);
 244         for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i) {
 245                 group_regs[i]->disable = m & 0xFF;
 246                 m >>= 8;
 247         }
 248         for (i = 0; i < MAX_BLACKFIN_GPTIMERS; ++i)
 249                 if (mask & (1 << i))
 250                         group_regs[BFIN_TIMER_OCTET(i)]->status |= trun_mask[i];
 251         SSYNC();
 252 }
 253 EXPORT_SYMBOL(disable_gptimers);
 254
 255 void set_gptimer_pulse_hi(int timer_id)
 256 {
 257         tassert(timer_id < MAX_BLACKFIN_GPTIMERS);
 258         timer_regs[timer_id]->config |= TIMER_PULSE_HI;
 259         SSYNC();
 260 }
 261 EXPORT_SYMBOL(set_gptimer_pulse_hi);
 262
 263 void clear_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(clear_gptimer_pulse_hi);
 270
 271 uint16_t get_enabled_gptimers(void)
 272 {
 273         int i;
 274         uint16_t result = 0;
 275         for (i = 0; i < BFIN_TIMER_NUM_GROUP; ++i)
 276                 result |= (group_regs[i]->enable << (i << 3));
 277         return result;
 278 }
 279 EXPORT_SYMBOL(get_enabled_gptimers);
 280
 281 MODULE_AUTHOR("Axel Weiss (awe@aglaia-gmbh.de)");
 282 MODULE_DESCRIPTION("Blackfin General Purpose Timers API");
 283 MODULE_LICENSE("GPL");