omap2+: Use dmtimer macros for clocksource

Use dmtimer macros for clocksource. As with the clockevent,
this allows us to initialize the rest of dmtimer code later on.

Note that eventually we will be initializing the timesource
from init_early so sched_clock will work properly for
CONFIG_PRINTK_TIME.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>

1 files changed, 36 insertions, 28 deletions

diff --git a/arch/arm/mach-omap2/timer-gp.c b/arch/arm/mach-omap2/timer-gp.c
index cf2ec85b95fa..2b8cb701c89f 100644
--- a/arch/arm/mach-omap2/timer-gp.c
+++ b/arch/arm/mach-omap2/timer-gp.c
@@ -262,20 +262,22 @@ static void __init omap2_gp_clockevent_init(int gptimer_id,
  * sync counter.  See clocksource setup in plat-omap/counter_32k.c
  */
 
-static void __init omap2_gp_clocksource_init(void)
+static void __init omap2_gp_clocksource_init(int unused, const char *dummy)
 {
 	omap_init_clocksource_32k();
 }
 
 #else
+
+static struct omap_dm_timer clksrc;
+
 /*
  * clocksource
  */
 static DEFINE_CLOCK_DATA(cd);
-static struct omap_dm_timer *gpt_clocksource;
 static cycle_t clocksource_read_cycles(struct clocksource *cs)
 {
-	return (cycle_t)omap_dm_timer_read_counter(gpt_clocksource);
+	return (cycle_t)__omap_dm_timer_read_counter(clksrc.io_base, 1);
 }
 
 static struct clocksource clocksource_gpt = {
@@ -290,43 +292,48 @@ static void notrace dmtimer_update_sched_clock(void)
 {
 	u32 cyc;
 
-	cyc = omap_dm_timer_read_counter(gpt_clocksource);
+	cyc = __omap_dm_timer_read_counter(clksrc.io_base, 1);
 
 	update_sched_clock(&cd, cyc, (u32)~0);
 }
 
-/* Setup free-running counter for clocksource */
-static void __init omap2_gp_clocksource_init(void)
+unsigned long long notrace sched_clock(void)
 {
-	static struct omap_dm_timer *gpt;
-	u32 tick_rate;
-	static char err1[] __initdata = KERN_ERR
-		"%s: failed to request dm-timer\n";
-	static char err2[] __initdata = KERN_ERR
-		"%s: can't register clocksource!\n";
+	u32 cyc = 0;
 
-	gpt = omap_dm_timer_request();
-	if (!gpt)
-		printk(err1, clocksource_gpt.name);
-	gpt_clocksource = gpt;
+	if (clksrc.reserved)
+		cyc = __omap_dm_timer_read_counter(clksrc.io_base, 1);
 
-	omap_dm_timer_set_source(gpt, OMAP_TIMER_SRC_SYS_CLK);
-	tick_rate = clk_get_rate(omap_dm_timer_get_fclk(gpt));
+	return cyc_to_sched_clock(&cd, cyc, (u32)~0);
+}
+
+/* Setup free-running counter for clocksource */
+static void __init omap2_gp_clocksource_init(int gptimer_id,
+						const char *fck_source)
+{
+	int res;
+
+	res = omap_dm_timer_init_one(&clksrc, gptimer_id, fck_source);
+	BUG_ON(res);
 
-	omap_dm_timer_set_load_start(gpt, 1, 0);
+	pr_info("OMAP clocksource: GPTIMER%d at %lu Hz\n",
+		gptimer_id, clksrc.rate);
 
-	init_sched_clock(&cd, dmtimer_update_sched_clock, 32, tick_rate);
+	__omap_dm_timer_load_start(clksrc.io_base, OMAP_TIMER_CTRL_ST, 0, 1);
+	init_sched_clock(&cd, dmtimer_update_sched_clock, 32, clksrc.rate);
 
-	if (clocksource_register_hz(&clocksource_gpt, tick_rate))
-		printk(err2, clocksource_gpt.name);
+	if (clocksource_register_hz(&clocksource_gpt, clksrc.rate))
+		pr_err("Could not register clocksource %s\n",
+			clocksource_gpt.name);
 }
 #endif
 
-#define OMAP_SYS_TIMER_INIT(name, clkev_nr, clkev_src)			\
+#define OMAP_SYS_TIMER_INIT(name, clkev_nr, clkev_src,			\
+				clksrc_nr, clksrc_src)			\
 static void __init omap##name##_timer_init(void)			\
 {									\
 	omap2_gp_clockevent_init((clkev_nr), clkev_src);		\
-	omap2_gp_clocksource_init();					\
+	omap2_gp_clocksource_init((clksrc_nr), clksrc_src);		\
 }
 
 #define OMAP_SYS_TIMER(name)						\
@@ -335,14 +342,15 @@ struct sys_timer omap##name##_timer = {					\
 };
 
 #ifdef CONFIG_ARCH_OMAP2
-OMAP_SYS_TIMER_INIT(2, 1, OMAP2_CLKEV_SOURCE)
+OMAP_SYS_TIMER_INIT(2, 1, OMAP2_CLKEV_SOURCE, 2, OMAP2_MPU_SOURCE)
 OMAP_SYS_TIMER(2)
 #endif
 
 #ifdef CONFIG_ARCH_OMAP3
-OMAP_SYS_TIMER_INIT(3, 1, OMAP3_CLKEV_SOURCE)
+OMAP_SYS_TIMER_INIT(3, 1, OMAP3_CLKEV_SOURCE, 2, OMAP3_MPU_SOURCE)
 OMAP_SYS_TIMER(3)
-OMAP_SYS_TIMER_INIT(3_secure, OMAP3_SECURE_TIMER, OMAP3_CLKEV_SOURCE)
+OMAP_SYS_TIMER_INIT(3_secure, OMAP3_SECURE_TIMER, OMAP3_CLKEV_SOURCE,
+			2, OMAP3_MPU_SOURCE)
 OMAP_SYS_TIMER(3_secure)
 #endif
 
@@ -354,7 +362,7 @@ static void __init omap4_timer_init(void)
 	BUG_ON(!twd_base);
 #endif
 	omap2_gp_clockevent_init(1, OMAP4_CLKEV_SOURCE);
-	omap2_gp_clocksource_init();
+	omap2_gp_clocksource_init(2, OMAP4_MPU_SOURCE);
 }
 OMAP_SYS_TIMER(4)
 #endif