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  * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2 of the License, or (at your
  12  * option) any later version.
  13  *
  14  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  15  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  16  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  17  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  20  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  21  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  22  *
  23  * You should have received a copy of the  GNU General Public License along
  24  * with this program; if not, write  to the Free Software Foundation, Inc.,
  25  * 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #include <linux/init.h>
  29 #include <asm/hardware.h>
  30 #include <asm/arch/dmtimer.h>
  31 #include <asm/io.h>
  32 #include <asm/arch/irqs.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/list.h>
  35
  36 #define OMAP_TIMER_COUNT                8
  37
  38 #define OMAP_TIMER_ID_REG               0x00
  39 #define OMAP_TIMER_OCP_CFG_REG          0x10
  40 #define OMAP_TIMER_SYS_STAT_REG         0x14
  41 #define OMAP_TIMER_STAT_REG             0x18
  42 #define OMAP_TIMER_INT_EN_REG           0x1c
  43 #define OMAP_TIMER_WAKEUP_EN_REG        0x20
  44 #define OMAP_TIMER_CTRL_REG             0x24
  45 #define OMAP_TIMER_COUNTER_REG          0x28
  46 #define OMAP_TIMER_LOAD_REG             0x2c
  47 #define OMAP_TIMER_TRIGGER_REG          0x30
  48 #define OMAP_TIMER_WRITE_PEND_REG       0x34
  49 #define OMAP_TIMER_MATCH_REG            0x38
  50 #define OMAP_TIMER_CAPTURE_REG          0x3c
  51 #define OMAP_TIMER_IF_CTRL_REG          0x40
  52
  53
  54 static struct dmtimer_info_struct {
  55         struct list_head        unused_timers;
  56         struct list_head        reserved_timers;
  57 } dm_timer_info;
  58
  59 static struct omap_dm_timer dm_timers[] = {
  60         { .base=0xfffb1400, .irq=INT_1610_GPTIMER1 },
  61         { .base=0xfffb1c00, .irq=INT_1610_GPTIMER2 },
  62         { .base=0xfffb2400, .irq=INT_1610_GPTIMER3 },
  63         { .base=0xfffb2c00, .irq=INT_1610_GPTIMER4 },
  64         { .base=0xfffb3400, .irq=INT_1610_GPTIMER5 },
  65         { .base=0xfffb3c00, .irq=INT_1610_GPTIMER6 },
  66         { .base=0xfffb4400, .irq=INT_1610_GPTIMER7 },
  67         { .base=0xfffb4c00, .irq=INT_1610_GPTIMER8 },
  68         { .base=0x0 },
  69 };
  70
  71
  72 static spinlock_t dm_timer_lock;
  73
  74
  75 inline void omap_dm_timer_write_reg(struct omap_dm_timer *timer, int reg, u32 value)
  76 {
  77         omap_writel(value, timer->base + reg);
  78         while (omap_dm_timer_read_reg(timer, OMAP_TIMER_WRITE_PEND_REG))
  79                 ;
  80 }
  81
  82 u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, int reg)
  83 {
  84         return omap_readl(timer->base + reg);
  85 }
  86
  87 int omap_dm_timers_active(void)
  88 {
  89         struct omap_dm_timer *timer;
  90
  91         for (timer = &dm_timers[0]; timer->base; ++timer)
  92                 if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
  93                     OMAP_TIMER_CTRL_ST)
  94                         return 1;
  95
  96         return 0;
  97 }
  98
  99
 100 /**
 101  * omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR
 102  * @inputmask: current value of idlect mask
 103  */
 104 __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
 105 {
 106         int n;
 107
 108         /* If ARMXOR cannot be idled this function call is unnecessary */
 109         if (!(inputmask & (1 << 1)))
 110                 return inputmask;
 111
 112         /* If any active timer is using ARMXOR return modified mask */
 113         for (n = 0; dm_timers[n].base; ++n)
 114                 if (omap_dm_timer_read_reg(&dm_timers[n], OMAP_TIMER_CTRL_REG)&
 115                     OMAP_TIMER_CTRL_ST) {
 116                         if (((omap_readl(MOD_CONF_CTRL_1)>>(n*2)) & 0x03) == 0)
 117                                 inputmask &= ~(1 << 1);
 118                         else
 119                                 inputmask &= ~(1 << 2);
 120                 }
 121
 122         return inputmask;
 123 }
 124
 125
 126 void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
 127 {
 128         int n = (timer - dm_timers) << 1;
 129         u32 l;
 130
 131         l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
 132         l |= source << n;
 133         omap_writel(l, MOD_CONF_CTRL_1);
 134 }
 135
 136
 137 static void omap_dm_timer_reset(struct omap_dm_timer *timer)
 138 {
 139         /* Reset and set posted mode */
 140         omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
 141         omap_dm_timer_write_reg(timer, OMAP_TIMER_OCP_CFG_REG, 0x02);
 142
 143         omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_ARMXOR);
 144 }
 145
 146
 147
 148 struct omap_dm_timer * omap_dm_timer_request(void)
 149 {
 150         struct omap_dm_timer *timer = NULL;
 151         unsigned long flags;
 152
 153         spin_lock_irqsave(&dm_timer_lock, flags);
 154         if (!list_empty(&dm_timer_info.unused_timers)) {
 155                 timer = (struct omap_dm_timer *)
 156                                 dm_timer_info.unused_timers.next;
 157                 list_move_tail((struct list_head *)timer,
 158                                 &dm_timer_info.reserved_timers);
 159         }
 160         spin_unlock_irqrestore(&dm_timer_lock, flags);
 161
 162         return timer;
 163 }
 164
 165
 166 void omap_dm_timer_free(struct omap_dm_timer *timer)
 167 {
 168         unsigned long flags;
 169
 170         omap_dm_timer_reset(timer);
 171
 172         spin_lock_irqsave(&dm_timer_lock, flags);
 173         list_move_tail((struct list_head *)timer, &dm_timer_info.unused_timers);
 174         spin_unlock_irqrestore(&dm_timer_lock, flags);
 175 }
 176
 177 void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
 178                                 unsigned int value)
 179 {
 180         omap_dm_timer_write_reg(timer, OMAP_TIMER_INT_EN_REG, value);
 181 }
 182
 183 unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
 184 {
 185         return omap_dm_timer_read_reg(timer, OMAP_TIMER_STAT_REG);
 186 }
 187
 188 void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
 189 {
 190         omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG, value);
 191 }
 192
 193 void omap_dm_timer_enable_autoreload(struct omap_dm_timer *timer)
 194 {
 195         u32 l;
 196         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 197         l |= OMAP_TIMER_CTRL_AR;
 198         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 199 }
 200
 201 void omap_dm_timer_trigger(struct omap_dm_timer *timer)
 202 {
 203         omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 1);
 204 }
 205
 206 void omap_dm_timer_set_trigger(struct omap_dm_timer *timer, unsigned int value)
 207 {
 208         u32 l;
 209
 210         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 211         l |= value & 0x3;
 212         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 213 }
 214
 215 void omap_dm_timer_start(struct omap_dm_timer *timer)
 216 {
 217         u32 l;
 218
 219         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 220         l |= OMAP_TIMER_CTRL_ST;
 221         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 222 }
 223
 224 void omap_dm_timer_stop(struct omap_dm_timer *timer)
 225 {
 226         u32 l;
 227
 228         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 229         l &= ~0x1;
 230         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 231 }
 232
 233 unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
 234 {
 235         return omap_dm_timer_read_reg(timer, OMAP_TIMER_COUNTER_REG);
 236 }
 237
 238 void omap_dm_timer_reset_counter(struct omap_dm_timer *timer)
 239 {
 240         omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, 0);
 241 }
 242
 243 void omap_dm_timer_set_load(struct omap_dm_timer *timer, unsigned int load)
 244 {
 245         omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
 246 }
 247
 248 void omap_dm_timer_set_match(struct omap_dm_timer *timer, unsigned int match)
 249 {
 250         omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
 251 }
 252
 253 void omap_dm_timer_enable_compare(struct omap_dm_timer *timer)
 254 {
 255         u32 l;
 256
 257         l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 258         l |= OMAP_TIMER_CTRL_CE;
 259         omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 260 }
 261
 262
 263 static inline void __dm_timer_init(void)
 264 {
 265         struct omap_dm_timer *timer;
 266
 267         spin_lock_init(&dm_timer_lock);
 268         INIT_LIST_HEAD(&dm_timer_info.unused_timers);
 269         INIT_LIST_HEAD(&dm_timer_info.reserved_timers);
 270
 271         timer = &dm_timers[0];
 272         while (timer->base) {
 273                 list_add_tail((struct list_head *)timer, &dm_timer_info.unused_timers);
 274                 omap_dm_timer_reset(timer);
 275                 timer++;
 276         }
 277 }
 278
 279 static int __init omap_dm_timer_init(void)
 280 {
 281         if (cpu_is_omap16xx())
 282                 __dm_timer_init();
 283         return 0;
 284 }
 285
 286 arch_initcall(omap_dm_timer_init);