[ARM] 3427/1: ARM: OMAP: 2/8 Update timers

Patch from Tony Lindgren

Update OMAP timers from linux-omap tree. The highlights of the
patch are:

- Move timer32k code from mach-omap1 to plat-omap and make it
  work also on omap24xx by Tony Lindgren
- Add support for dmtimer idle check for PM by Tuukka Tikkanen

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 0 insertions, 197 deletions

diff --git a/arch/arm/mach-omap1/time.c b/arch/arm/mach-omap1/time.c
index cdbf4d7620c6..a85fe6066bc4 100644
--- a/arch/arm/mach-omap1/time.c
+++ b/arch/arm/mach-omap1/time.c
@@ -51,8 +51,6 @@
 
 struct sys_timer omap_timer;
 
-#ifdef CONFIG_OMAP_MPU_TIMER
-
 /*
  * ---------------------------------------------------------------------------
  * MPU timer
@@ -222,195 +220,6 @@ unsigned long long sched_clock(void)
 
         return cycles_2_ns(ticks64);
 }
-#endif  /* CONFIG_OMAP_MPU_TIMER */
-
-#ifdef CONFIG_OMAP_32K_TIMER
-
-#ifdef CONFIG_ARCH_OMAP15XX
-#error OMAP 32KHz timer does not currently work on 15XX!
-#endif
-
-/*
- * ---------------------------------------------------------------------------
- * 32KHz OS timer
- *
- * This currently works only on 16xx, as 1510 does not have the continuous
- * 32KHz synchronous timer. The 32KHz synchronous timer is used to keep track
- * of time in addition to the 32KHz OS timer. Using only the 32KHz OS timer
- * on 1510 would be possible, but the timer would not be as accurate as
- * with the 32KHz synchronized timer.
- * ---------------------------------------------------------------------------
- */
-#define OMAP_32K_TIMER_BASE             0xfffb9000
-#define OMAP_32K_TIMER_CR               0x08
-#define OMAP_32K_TIMER_TVR              0x00
-#define OMAP_32K_TIMER_TCR              0x04
-
-#define OMAP_32K_TICKS_PER_HZ           (32768 / HZ)
-
-/*
- * TRM says 1 / HZ = ( TVR + 1) / 32768, so TRV = (32768 / HZ) - 1
- * so with HZ = 100, TVR = 327.68.
- */
-#define OMAP_32K_TIMER_TICK_PERIOD      ((32768 / HZ) - 1)
-#define TIMER_32K_SYNCHRONIZED          0xfffbc410
-
-#define JIFFIES_TO_HW_TICKS(nr_jiffies, clock_rate)                     \
-                                (((nr_jiffies) * (clock_rate)) / HZ)
-
-static inline void omap_32k_timer_write(int val, int reg)
-{
-        omap_writew(val, reg + OMAP_32K_TIMER_BASE);
-}
-
-static inline unsigned long omap_32k_timer_read(int reg)
-{
-        return omap_readl(reg + OMAP_32K_TIMER_BASE) & 0xffffff;
-}
-
-/*
- * The 32KHz synchronized timer is an additional timer on 16xx.
- * It is always running.
- */
-static inline unsigned long omap_32k_sync_timer_read(void)
-{
-        return omap_readl(TIMER_32K_SYNCHRONIZED);
-}
-
-static inline void omap_32k_timer_start(unsigned long load_val)
-{
-        omap_32k_timer_write(load_val, OMAP_32K_TIMER_TVR);
-        omap_32k_timer_write(0x0f, OMAP_32K_TIMER_CR);
-}
-
-static inline void omap_32k_timer_stop(void)
-{
-        omap_32k_timer_write(0x0, OMAP_32K_TIMER_CR);
-}
-
-/*
- * Rounds down to nearest usec. Note that this will overflow for larger values.
- */
-static inline unsigned long omap_32k_ticks_to_usecs(unsigned long ticks_32k)
-{
-        return (ticks_32k * 5*5*5*5*5*5) >> 9;
-}
-
-/*
- * Rounds down to nearest nsec.
- */
-static inline unsigned long long
-omap_32k_ticks_to_nsecs(unsigned long ticks_32k)
-{
-        return (unsigned long long) ticks_32k * 1000 * 5*5*5*5*5*5 >> 9;
-}
-
-static unsigned long omap_32k_last_tick = 0;
-
-/*
- * Returns elapsed usecs since last 32k timer interrupt
- */
-static unsigned long omap_32k_timer_gettimeoffset(void)
-{
-        unsigned long now = omap_32k_sync_timer_read();
-        return omap_32k_ticks_to_usecs(now - omap_32k_last_tick);
-}
-
-/*
- * Returns current time from boot in nsecs. It's OK for this to wrap
- * around for now, as it's just a relative time stamp.
- */
-unsigned long long sched_clock(void)
-{
-        return omap_32k_ticks_to_nsecs(omap_32k_sync_timer_read());
-}
-
-/*
- * Timer interrupt for 32KHz timer. When dynamic tick is enabled, this
- * function is also called from other interrupts to remove latency
- * issues with dynamic tick. In the dynamic tick case, we need to lock
- * with irqsave.
- */
-static irqreturn_t omap_32k_timer_interrupt(int irq, void *dev_id,
-                                            struct pt_regs *regs)
-{
-        unsigned long flags;
-        unsigned long now;
-
-        write_seqlock_irqsave(&xtime_lock, flags);
-        now = omap_32k_sync_timer_read();
-
-        while (now - omap_32k_last_tick >= OMAP_32K_TICKS_PER_HZ) {
-                omap_32k_last_tick += OMAP_32K_TICKS_PER_HZ;
-                timer_tick(regs);
-        }
-
-        /* Restart timer so we don't drift off due to modulo or dynamic tick.
-         * By default we program the next timer to be continuous to avoid
-         * latencies during high system load. During dynamic tick operation the
-         * continuous timer can be overridden from pm_idle to be longer.
-         */
-        omap_32k_timer_start(omap_32k_last_tick + OMAP_32K_TICKS_PER_HZ - now);
-        write_sequnlock_irqrestore(&xtime_lock, flags);
-
-        return IRQ_HANDLED;
-}
-
-#ifdef CONFIG_NO_IDLE_HZ
-/*
- * Programs the next timer interrupt needed. Called when dynamic tick is
- * enabled, and to reprogram the ticks to skip from pm_idle. Note that
- * we can keep the timer continuous, and don't need to set it to run in
- * one-shot mode. This is because the timer will get reprogrammed again
- * after next interrupt.
- */
-void omap_32k_timer_reprogram(unsigned long next_tick)
-{
-        omap_32k_timer_start(JIFFIES_TO_HW_TICKS(next_tick, 32768) + 1);
-}
-
-static struct irqaction omap_32k_timer_irq;
-extern struct timer_update_handler timer_update;
-
-static int omap_32k_timer_enable_dyn_tick(void)
-{
-        /* No need to reprogram timer, just use the next interrupt */
-        return 0;
-}
-
-static int omap_32k_timer_disable_dyn_tick(void)
-{
-        omap_32k_timer_start(OMAP_32K_TIMER_TICK_PERIOD);
-        return 0;
-}
-
-static struct dyn_tick_timer omap_dyn_tick_timer = {
-        .enable         = omap_32k_timer_enable_dyn_tick,
-        .disable        = omap_32k_timer_disable_dyn_tick,
-        .reprogram      = omap_32k_timer_reprogram,
-        .handler        = omap_32k_timer_interrupt,
-};
-#endif  /* CONFIG_NO_IDLE_HZ */
-
-static struct irqaction omap_32k_timer_irq = {
-        .name           = "32KHz timer",
-        .flags          = SA_INTERRUPT | SA_TIMER,
-        .handler        = omap_32k_timer_interrupt,
-};
-
-static __init void omap_init_32k_timer(void)
-{
-
-#ifdef CONFIG_NO_IDLE_HZ
-        omap_timer.dyn_tick = &omap_dyn_tick_timer;
-#endif
-
-        setup_irq(INT_OS_TIMER, &omap_32k_timer_irq);
-        omap_timer.offset  = omap_32k_timer_gettimeoffset;
-        omap_32k_last_tick = omap_32k_sync_timer_read();
-        omap_32k_timer_start(OMAP_32K_TIMER_TICK_PERIOD);
-}
-#endif  /* CONFIG_OMAP_32K_TIMER */
 
 /*
  * ---------------------------------------------------------------------------
@@ -419,13 +228,7 @@ static __init void omap_init_32k_timer(void)
  */
 static void __init omap_timer_init(void)
 {
-#if defined(CONFIG_OMAP_MPU_TIMER)
         omap_init_mpu_timer();
-#elif defined(CONFIG_OMAP_32K_TIMER)
-        omap_init_32k_timer();
-#else
-#error No system timer selected in Kconfig!
-#endif
 }
 
 struct sys_timer omap_timer = {