This patch makes timer-gp.c to use only a subset of dmtimer
functions without the need to initialize dmtimer code early.
Also note that now with the inline functions, timer_set_next_event
becomes more efficient in the lines of assembly code.
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
Reviewed-by: Kevin Hilman <khilman@xxxxxx>
---
arch/arm/mach-omap2/timer-gp.c | 147 ++++++++++++++++++++++-------
arch/arm/plat-omap/include/plat/dmtimer.h | 1
2 files changed, 113 insertions(+), 35 deletions(-)
diff --git a/arch/arm/mach-omap2/timer-gp.c b/arch/arm/mach-omap2/timer-gp.c
index a0d8e83..62c0d5c 100644
--- a/arch/arm/mach-omap2/timer-gp.c
+++ b/arch/arm/mach-omap2/timer-gp.c
@@ -45,10 +45,33 @@
#include "timer-gp.h"
+/* Parent clocks, eventually these will come from the clock framework */
+
+#define OMAP2_MPU_SOURCE "sys_ck"
+#define OMAP3_MPU_SOURCE OMAP2_MPU_SOURCE
+#define OMAP4_MPU_SOURCE "sys_clkin_ck"
+#define OMAP2_32K_SOURCE "func_32k_ck"
+#define OMAP3_32K_SOURCE "omap_32k_fck"
+#define OMAP4_32K_SOURCE "sys_32k_ck"
+
+#ifdef CONFIG_OMAP_32K_TIMER
+#define OMAP2_CLKEV_SOURCE OMAP2_32K_SOURCE
+#define OMAP3_CLKEV_SOURCE OMAP3_32K_SOURCE
+#define OMAP4_CLKEV_SOURCE OMAP4_32K_SOURCE
+#define OMAP3_SECURE_TIMER 12
+#else
+#define OMAP2_CLKEV_SOURCE OMAP2_MPU_SOURCE
+#define OMAP3_CLKEV_SOURCE OMAP3_MPU_SOURCE
+#define OMAP4_CLKEV_SOURCE OMAP4_MPU_SOURCE
+#define OMAP3_SECURE_TIMER 1
+#endif
/* MAX_GPTIMER_ID: number of GPTIMERs on the chip */
#define MAX_GPTIMER_ID 12
+/* Clockevent code */
+
+static struct omap_dm_timer clkev;
static struct omap_dm_timer *gptimer;
static struct clock_event_device clockevent_gpt;
static u8 __initdata gptimer_id = 1;
@@ -57,10 +80,9 @@ struct omap_dm_timer *gptimer_wakeup;
static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id)
{
- struct omap_dm_timer *gpt = (struct omap_dm_timer *)dev_id;
struct clock_event_device *evt = &clockevent_gpt;
- omap_dm_timer_write_status(gpt, OMAP_TIMER_INT_OVERFLOW);
+ __omap_dm_timer_write_status(clkev.io_base, OMAP_TIMER_INT_OVERFLOW);
evt->event_handler(evt);
return IRQ_HANDLED;
@@ -75,7 +97,8 @@ static struct irqaction omap2_gp_timer_irq = {
static int omap2_gp_timer_set_next_event(unsigned long cycles,
struct clock_event_device *evt)
{
- omap_dm_timer_set_load_start(gptimer, 0, 0xffffffff - cycles);
+ __omap_dm_timer_load_start(clkev.io_base, OMAP_TIMER_CTRL_ST,
+ 0xffffffff - cycles, 1);
return 0;
}
@@ -85,13 +108,18 @@ static void omap2_gp_timer_set_mode(enum clock_event_mode mode,
{
u32 period;
- omap_dm_timer_stop(gptimer);
+ __omap_dm_timer_stop(clkev.io_base, 1, clkev.rate);
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
- period = clk_get_rate(omap_dm_timer_get_fclk(gptimer)) / HZ;
+ period = clkev.rate / HZ;
period -= 1;
- omap_dm_timer_set_load_start(gptimer, 1, 0xffffffff - period);
+ /* Looks like we need to first set the load value separately */
+ __omap_dm_timer_write(clkev.io_base, OMAP_TIMER_LOAD_REG,
+ 0xffffffff - period, 1);
+ __omap_dm_timer_load_start(clkev.io_base,
+ OMAP_TIMER_CTRL_AR | OMAP_TIMER_CTRL_ST,
+ 0xffffffff - period, 1);
break;
case CLOCK_EVT_MODE_ONESHOT:
break;
@@ -130,43 +158,89 @@ int __init omap2_gp_clockevent_set_gptimer(u8 id)
return 0;
}
-static void __init omap2_gp_clockevent_init(void)
+static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
+ int gptimer_id,
+ const char *fck_source)
{
- u32 tick_rate;
- int src;
- char clockevent_hwmod_name[8]; /* 8 = sizeof("timerXX0") */
+ char name[10]; /* 10 = sizeof("gptXX_Xck0") */
+ struct omap_hwmod *oh;
+ size_t size;
+ int res = 0;
+
+ sprintf(name, "timer%d", gptimer_id);
+ omap_hwmod_setup_one(name);
+ oh = omap_hwmod_lookup(name);
+ if (!oh)
+ return -ENODEV;
+
+ timer->irq = oh->mpu_irqs[0].irq;
+ timer->phys_base = oh->slaves[0]->addr->pa_start;
+ size = oh->slaves[0]->addr->pa_end - timer->phys_base;
+
+ /* Static mapping, never released */
+ timer->io_base = ioremap(timer->phys_base, size);
+ if (!timer->io_base)
+ return -ENXIO;
+
+ /* After the dmtimer is using hwmod these clocks won't be needed */
+ sprintf(name, "gpt%d_fck", gptimer_id);
+ timer->fclk = clk_get(NULL, name);
+ if (IS_ERR(timer->fclk))
+ return -ENODEV;
+
+ sprintf(name, "gpt%d_ick", gptimer_id);
+ timer->iclk = clk_get(NULL, name);
+ if (IS_ERR(timer->iclk)) {
+ clk_put(timer->fclk);
+ return -ENODEV;
+ }
- inited = 1;
+ omap_hwmod_enable(oh);
+
+ if (gptimer_id != 12) {
+ struct clk *src;
+
+ src = clk_get(NULL, fck_source);
+ if (IS_ERR(src)) {
+ res = -EINVAL;
+ } else {
+ res = __omap_dm_timer_set_source(timer->fclk, src);
+ if (IS_ERR_VALUE(res))
+ pr_warning("%s: timer%i cannot set source\n",
+ __func__, gptimer_id);
+ clk_put(src);
+ }
+ }
+ __omap_dm_timer_reset(timer->io_base, 1, 1);
+ timer->posted = 1;
+
+ timer->rate = clk_get_rate(timer->fclk);
- sprintf(clockevent_hwmod_name, "timer%d", gptimer_id);
- omap_hwmod_setup_one(clockevent_hwmod_name);
+ timer->reserved = 1;
gptimer = omap_dm_timer_request_specific(gptimer_id);
BUG_ON(gptimer == NULL);
gptimer_wakeup = gptimer;
-#if defined(CONFIG_OMAP_32K_TIMER)
- src = OMAP_TIMER_SRC_32_KHZ;
-#else
- src = OMAP_TIMER_SRC_SYS_CLK;
- WARN(gptimer_id == 12, "WARNING: GPTIMER12 can only use the "
- "secure 32KiHz clock source\n");
-#endif
+ return res;
+}
- if (gptimer_id != 12)
- WARN(IS_ERR_VALUE(omap_dm_timer_set_source(gptimer, src)),
- "timer-gp: omap_dm_timer_set_source() failed\n");
+static void __init omap2_gp_clockevent_init(int gptimer_id,
+ const char *fck_source)
+{
+ int res;
- tick_rate = clk_get_rate(omap_dm_timer_get_fclk(gptimer));
+ inited = 1;
- pr_info("OMAP clockevent source: GPTIMER%d at %u Hz\n",
- gptimer_id, tick_rate);
+ res = omap_dm_timer_init_one(&clkev, gptimer_id, fck_source);
+ BUG_ON(res);
omap2_gp_timer_irq.dev_id = (void *)gptimer;
- setup_irq(omap_dm_timer_get_irq(gptimer), &omap2_gp_timer_irq);
- omap_dm_timer_set_int_enable(gptimer, OMAP_TIMER_INT_OVERFLOW);
+ setup_irq(clkev.irq, &omap2_gp_timer_irq);
- clockevent_gpt.mult = div_sc(tick_rate, NSEC_PER_SEC,
+ __omap_dm_timer_int_enable(clkev.io_base, OMAP_TIMER_INT_OVERFLOW);
+
+ clockevent_gpt.mult = div_sc(clkev.rate, NSEC_PER_SEC,
clockevent_gpt.shift);
clockevent_gpt.max_delta_ns =
clockevent_delta2ns(0xffffffff, &clockevent_gpt);
@@ -176,6 +250,9 @@ static void __init omap2_gp_clockevent_init(void)
clockevent_gpt.cpumask = cpumask_of(0);
clockevents_register_device(&clockevent_gpt);
+
+ pr_info("OMAP clockevent source: GPTIMER%d at %lu Hz\n",
+ gptimer_id, clkev.rate);
}
/* Clocksource code */
@@ -247,11 +324,11 @@ static void __init omap2_gp_clocksource_init(void)
}
#endif
-#define OMAP_SYS_TIMER_INIT(name) \
+#define OMAP_SYS_TIMER_INIT(name, clkev_nr, clkev_src) \
static void __init omap##name##_timer_init(void) \
{ \
omap_dm_timer_init(); \
- omap2_gp_clockevent_init(); \
+ omap2_gp_clockevent_init((clkev_nr), clkev_src); \
omap2_gp_clocksource_init(); \
}
@@ -261,14 +338,14 @@ struct sys_timer omap##name##_timer = { \
};
#ifdef CONFIG_ARCH_OMAP2
-OMAP_SYS_TIMER_INIT(2)
+OMAP_SYS_TIMER_INIT(2, 1, OMAP2_CLKEV_SOURCE)
OMAP_SYS_TIMER(2)
#endif
#ifdef CONFIG_ARCH_OMAP3
-OMAP_SYS_TIMER_INIT(3)
+OMAP_SYS_TIMER_INIT(3, 1, OMAP3_CLKEV_SOURCE)
OMAP_SYS_TIMER(3)
-OMAP_SYS_TIMER_INIT(3_secure)
+OMAP_SYS_TIMER_INIT(3_secure, OMAP3_SECURE_TIMER, OMAP3_CLKEV_SOURCE)
OMAP_SYS_TIMER(3_secure)
#endif
@@ -280,7 +357,7 @@ static void __init omap4_timer_init(void)
BUG_ON(!twd_base);
#endif
omap_dm_timer_init();
- omap2_gp_clockevent_init();
+ omap2_gp_clockevent_init(1, OMAP4_CLKEV_SOURCE);
omap2_gp_clocksource_init();
}
OMAP_SYS_TIMER(4)
diff --git a/arch/arm/plat-omap/include/plat/dmtimer.h b/arch/arm/plat-omap/include/plat/dmtimer.h
index 54664a7..dd8b3ff 100644
--- a/arch/arm/plat-omap/include/plat/dmtimer.h
+++ b/arch/arm/plat-omap/include/plat/dmtimer.h
@@ -216,6 +216,7 @@ struct omap_dm_timer {
struct clk *iclk, *fclk;
#endif
void __iomem *io_base;
+ unsigned long rate;
unsigned reserved:1;
unsigned enabled:1;
unsigned posted:1;
--
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