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Diffstat (limited to 'arch/arm/mach-omap2/timer.c')
-rw-r--r--arch/arm/mach-omap2/timer.c114
1 files changed, 108 insertions, 6 deletions
diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index 2ba4f57dda86..8847d6eb2313 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -36,16 +36,20 @@
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/slab.h>
+#include <linux/of.h>
#include <asm/mach/time.h>
-#include <plat/dmtimer.h>
#include <asm/smp_twd.h>
#include <asm/sched_clock.h>
-#include "common.h"
+
+#include <asm/arch_timer.h>
#include <plat/omap_hwmod.h>
#include <plat/omap_device.h>
+#include <plat/dmtimer.h>
#include <plat/omap-pm.h>
+#include "soc.h"
+#include "common.h"
#include "powerdomain.h"
/* Parent clocks, eventually these will come from the clock framework */
@@ -69,6 +73,11 @@
#define OMAP3_SECURE_TIMER 1
#endif
+#define REALTIME_COUNTER_BASE 0x48243200
+#define INCREMENTER_NUMERATOR_OFFSET 0x10
+#define INCREMENTER_DENUMERATOR_RELOAD_OFFSET 0x14
+#define NUMERATOR_DENUMERATOR_MASK 0xfffff000
+
/* Clockevent code */
static struct omap_dm_timer clkev;
@@ -211,7 +220,7 @@ static void __init omap2_gp_clockevent_init(int gptimer_id,
res = omap_dm_timer_init_one(&clkev, gptimer_id, fck_source);
BUG_ON(res);
- omap2_gp_timer_irq.dev_id = (void *)&clkev;
+ omap2_gp_timer_irq.dev_id = &clkev;
setup_irq(clkev.irq, &omap2_gp_timer_irq);
__omap_dm_timer_int_enable(&clkev, OMAP_TIMER_INT_OVERFLOW);
@@ -346,6 +355,84 @@ static void __init omap2_clocksource_init(int gptimer_id,
omap2_gptimer_clocksource_init(gptimer_id, fck_source);
}
+#ifdef CONFIG_SOC_HAS_REALTIME_COUNTER
+/*
+ * The realtime counter also called master counter, is a free-running
+ * counter, which is related to real time. It produces the count used
+ * by the CPU local timer peripherals in the MPU cluster. The timer counts
+ * at a rate of 6.144 MHz. Because the device operates on different clocks
+ * in different power modes, the master counter shifts operation between
+ * clocks, adjusting the increment per clock in hardware accordingly to
+ * maintain a constant count rate.
+ */
+static void __init realtime_counter_init(void)
+{
+ void __iomem *base;
+ static struct clk *sys_clk;
+ unsigned long rate;
+ unsigned int reg, num, den;
+
+ base = ioremap(REALTIME_COUNTER_BASE, SZ_32);
+ if (!base) {
+ pr_err("%s: ioremap failed\n", __func__);
+ return;
+ }
+ sys_clk = clk_get(NULL, "sys_clkin_ck");
+ if (!sys_clk) {
+ pr_err("%s: failed to get system clock handle\n", __func__);
+ iounmap(base);
+ return;
+ }
+
+ rate = clk_get_rate(sys_clk);
+ /* Numerator/denumerator values refer TRM Realtime Counter section */
+ switch (rate) {
+ case 1200000:
+ num = 64;
+ den = 125;
+ break;
+ case 1300000:
+ num = 768;
+ den = 1625;
+ break;
+ case 19200000:
+ num = 8;
+ den = 25;
+ break;
+ case 2600000:
+ num = 384;
+ den = 1625;
+ break;
+ case 2700000:
+ num = 256;
+ den = 1125;
+ break;
+ case 38400000:
+ default:
+ /* Program it for 38.4 MHz */
+ num = 4;
+ den = 25;
+ break;
+ }
+
+ /* Program numerator and denumerator registers */
+ reg = __raw_readl(base + INCREMENTER_NUMERATOR_OFFSET) &
+ NUMERATOR_DENUMERATOR_MASK;
+ reg |= num;
+ __raw_writel(reg, base + INCREMENTER_NUMERATOR_OFFSET);
+
+ reg = __raw_readl(base + INCREMENTER_NUMERATOR_OFFSET) &
+ NUMERATOR_DENUMERATOR_MASK;
+ reg |= den;
+ __raw_writel(reg, base + INCREMENTER_DENUMERATOR_RELOAD_OFFSET);
+
+ iounmap(base);
+}
+#else
+static inline void __init realtime_counter_init(void)
+{}
+#endif
+
#define OMAP_SYS_TIMER_INIT(name, clkev_nr, clkev_src, \
clksrc_nr, clksrc_src) \
static void __init omap##name##_timer_init(void) \
@@ -380,8 +467,7 @@ OMAP_SYS_TIMER(3_am33xx)
#ifdef CONFIG_ARCH_OMAP4
#ifdef CONFIG_LOCAL_TIMERS
static DEFINE_TWD_LOCAL_TIMER(twd_local_timer,
- OMAP44XX_LOCAL_TWD_BASE,
- OMAP44XX_IRQ_LOCALTIMER);
+ OMAP44XX_LOCAL_TWD_BASE, 29 + OMAP_INTC_START);
#endif
static void __init omap4_timer_init(void)
@@ -393,6 +479,11 @@ static void __init omap4_timer_init(void)
if (omap_rev() != OMAP4430_REV_ES1_0) {
int err;
+ if (of_have_populated_dt()) {
+ twd_local_timer_of_register();
+ return;
+ }
+
err = twd_local_timer_register(&twd_local_timer);
if (err)
pr_err("twd_local_timer_register failed %d\n", err);
@@ -403,7 +494,18 @@ OMAP_SYS_TIMER(4)
#endif
#ifdef CONFIG_SOC_OMAP5
-OMAP_SYS_TIMER_INIT(5, 1, OMAP4_CLKEV_SOURCE, 2, OMAP4_MPU_SOURCE)
+static void __init omap5_timer_init(void)
+{
+ int err;
+
+ omap2_gp_clockevent_init(1, OMAP4_CLKEV_SOURCE);
+ omap2_clocksource_init(2, OMAP4_MPU_SOURCE);
+ realtime_counter_init();
+
+ err = arch_timer_of_register();
+ if (err)
+ pr_err("%s: arch_timer_register failed %d\n", __func__, err);
+}
OMAP_SYS_TIMER(5)
#endif