8 files changed, 91 insertions, 12 deletions

diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
index 744740ae1b9c..3a7a29d1f9a7 100644
--- a/arch/arm/mach-omap2/board-omap3beagle.c
+++ b/arch/arm/mach-omap2/board-omap3beagle.c
@@ -42,6 +42,7 @@
 #include <mach/nand.h>
 #include <mach/mux.h>
 #include <mach/usb.h>
+#include <mach/timer-gp.h>
 
 #include "mmc-twl4030.h"
 
@@ -186,6 +187,9 @@ static void __init omap3_beagle_init_irq(void)
 {
         omap2_init_common_hw(NULL);
         omap_init_irq();
+#ifdef CONFIG_OMAP_32K_TIMER
+        omap2_gp_clockevent_set_gptimer(12);
+#endif
         omap_gpio_init();
 }
 
diff --git a/arch/arm/mach-omap2/clock24xx.c b/arch/arm/mach-omap2/clock24xx.c
index 5ea418327e89..efc59c49341b 100644
--- a/arch/arm/mach-omap2/clock24xx.c
+++ b/arch/arm/mach-omap2/clock24xx.c
@@ -66,6 +66,7 @@ struct omap_clk {
 static struct omap_clk omap24xx_clks[] = {
         /* external root sources */
         CLK(NULL,       "func_32k_ck",  &func_32k_ck,   CK_243X | CK_242X),
+        CLK(NULL,       "secure_32k_ck", &secure_32k_ck, CK_243X | CK_242X),
         CLK(NULL,       "osc_ck",       &osc_ck,        CK_243X | CK_242X),
         CLK(NULL,       "sys_ck",       &sys_ck,        CK_243X | CK_242X),
         CLK(NULL,       "alt_ck",       &alt_ck,        CK_243X | CK_242X),
diff --git a/arch/arm/mach-omap2/clock24xx.h b/arch/arm/mach-omap2/clock24xx.h
index 33c3e5b14323..88c5acb40fcf 100644
--- a/arch/arm/mach-omap2/clock24xx.h
+++ b/arch/arm/mach-omap2/clock24xx.h
@@ -625,6 +625,14 @@ static struct clk func_32k_ck = {
         .clkdm_name     = "wkup_clkdm",
 };
 
+static struct clk secure_32k_ck = {
+        .name           = "secure_32k_ck",
+        .ops            = &clkops_null,
+        .rate           = 32768,
+        .flags          = RATE_FIXED,
+        .clkdm_name     = "wkup_clkdm",
+};
+
 /* Typical 12/13MHz in standalone mode, will be 26Mhz in chassis mode */
 static struct clk osc_ck = {            /* (*12, *13, 19.2, *26, 38.4)MHz */
         .name           = "osc_ck",
@@ -1790,7 +1798,7 @@ static struct clk gpt12_ick = {
 static struct clk gpt12_fck = {
         .name           = "gpt12_fck",
         .ops            = &clkops_omap2_dflt_wait,
-        .parent         = &func_32k_ck,
+        .parent         = &secure_32k_ck,
         .clkdm_name     = "core_l4_clkdm",
         .enable_reg     = OMAP_CM_REGADDR(CORE_MOD, CM_FCLKEN1),
         .enable_bit     = OMAP24XX_EN_GPT12_SHIFT,
diff --git a/arch/arm/mach-omap2/clock34xx.h b/arch/arm/mach-omap2/clock34xx.h
index f0090175d597..6763b8f73028 100644
--- a/arch/arm/mach-omap2/clock34xx.h
+++ b/arch/arm/mach-omap2/clock34xx.h
@@ -2901,7 +2901,6 @@ static struct clk sr_l4_ick = {
 
 /* SECURE_32K_FCK clocks */
 
-/* XXX This clock no longer exists in 3430 TRM rev F */
 static struct clk gpt12_fck = {
         .name           = "gpt12_fck",
         .ops            = &clkops_null,
diff --git a/arch/arm/mach-omap2/timer-gp.c b/arch/arm/mach-omap2/timer-gp.c
index 9fc13a2cc3f4..7835048041eb 100644
--- a/arch/arm/mach-omap2/timer-gp.c
+++ b/arch/arm/mach-omap2/timer-gp.c
@@ -3,6 +3,8 @@
  *
  * OMAP2 GP timer support.
  *
+ * Copyright (C) 2009 Nokia Corporation
+ *
  * Update to use new clocksource/clockevent layers
  * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
  * Copyright (C) 2007 MontaVista Software, Inc.
@@ -36,8 +38,13 @@
 #include <asm/mach/time.h>
 #include <mach/dmtimer.h>
 
+/* MAX_GPTIMER_ID: number of GPTIMERs on the chip */
+#define MAX_GPTIMER_ID          12
+
 static struct omap_dm_timer *gptimer;
 static struct clock_event_device clockevent_gpt;
+static u8 __initdata gptimer_id = 1;
+static u8 __initdata inited;
 
 static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id)
 {
@@ -95,20 +102,53 @@ static struct clock_event_device clockevent_gpt = {
         .set_mode       = omap2_gp_timer_set_mode,
 };
 
+/**
+ * omap2_gp_clockevent_set_gptimer - set which GPTIMER is used for clockevents
+ * @id: GPTIMER to use (1..MAX_GPTIMER_ID)
+ *
+ * Define the GPTIMER that the system should use for the tick timer.
+ * Meant to be called from board-*.c files in the event that GPTIMER1, the
+ * default, is unsuitable.  Returns -EINVAL on error or 0 on success.
+ */
+int __init omap2_gp_clockevent_set_gptimer(u8 id)
+{
+        if (id < 1 || id > MAX_GPTIMER_ID)
+                return -EINVAL;
+
+        BUG_ON(inited);
+
+        gptimer_id = id;
+
+        return 0;
+}
+
 static void __init omap2_gp_clockevent_init(void)
 {
         u32 tick_rate;
+        int src;
+
+        inited = 1;
 
-        gptimer = omap_dm_timer_request_specific(1);
+        gptimer = omap_dm_timer_request_specific(gptimer_id);
         BUG_ON(gptimer == NULL);
 
 #if defined(CONFIG_OMAP_32K_TIMER)
-        omap_dm_timer_set_source(gptimer, OMAP_TIMER_SRC_32_KHZ);
+        src = OMAP_TIMER_SRC_32_KHZ;
 #else
-        omap_dm_timer_set_source(gptimer, OMAP_TIMER_SRC_SYS_CLK);
+        src = OMAP_TIMER_SRC_SYS_CLK;
+        WARN(gptimer_id == 12, "WARNING: GPTIMER12 can only use the "
+             "secure 32KiHz clock source\n");
 #endif
+
+        if (gptimer_id != 12)
+                WARN(IS_ERR_VALUE(omap_dm_timer_set_source(gptimer, src)),
+                     "timer-gp: omap_dm_timer_set_source() failed\n");
+
         tick_rate = clk_get_rate(omap_dm_timer_get_fclk(gptimer));
 
+        pr_info("OMAP clockevent source: GPTIMER%d at %u Hz\n",
+                gptimer_id, tick_rate);
+
         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);
@@ -125,6 +165,8 @@ static void __init omap2_gp_clockevent_init(void)
         clockevents_register_device(&clockevent_gpt);
 }
 
+/* Clocksource code */
+
 #ifdef CONFIG_OMAP_32K_TIMER
 /* 
  * When 32k-timer is enabled, don't use GPTimer for clocksource
diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
index a05205c12f7b..55bb99631292 100644
--- a/arch/arm/plat-omap/dmtimer.c
+++ b/arch/arm/plat-omap/dmtimer.c
@@ -509,7 +509,7 @@ EXPORT_SYMBOL_GPL(omap_dm_timer_stop);
 
 #ifdef CONFIG_ARCH_OMAP1
 
-void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
+int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
 {
         int n = (timer - dm_timers) << 1;
         u32 l;
@@ -517,23 +517,31 @@ void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
         l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
         l |= source << n;
         omap_writel(l, MOD_CONF_CTRL_1);
+
+        return 0;
 }
 EXPORT_SYMBOL_GPL(omap_dm_timer_set_source);
 
 #else
 
-void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
+int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
 {
+        int ret = -EINVAL;
+
         if (source < 0 || source >= 3)
-                return;
+                return -EINVAL;
 
         clk_disable(timer->fclk);
-        clk_set_parent(timer->fclk, dm_source_clocks[source]);
+        ret = clk_set_parent(timer->fclk, dm_source_clocks[source]);
         clk_enable(timer->fclk);
 
-        /* When the functional clock disappears, too quick writes seem to
-         * cause an abort. */
+        /*
+         * When the functional clock disappears, too quick writes seem
+         * to cause an abort. XXX Is this still necessary?
+         */
         __delay(150000);
+
+        return ret;
 }
 EXPORT_SYMBOL_GPL(omap_dm_timer_set_source);
 
diff --git a/arch/arm/plat-omap/include/mach/dmtimer.h b/arch/arm/plat-omap/include/mach/dmtimer.h
index 6dc703138210..20f1054c0a80 100644
--- a/arch/arm/plat-omap/include/mach/dmtimer.h
+++ b/arch/arm/plat-omap/include/mach/dmtimer.h
@@ -64,7 +64,7 @@ void omap_dm_timer_trigger(struct omap_dm_timer *timer);
 void omap_dm_timer_start(struct omap_dm_timer *timer);
 void omap_dm_timer_stop(struct omap_dm_timer *timer);
 
-void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source);
+int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source);
 void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload, unsigned int value);
 void omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload, unsigned int value);
 void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable, unsigned int match);
diff --git a/arch/arm/plat-omap/include/mach/timer-gp.h b/arch/arm/plat-omap/include/mach/timer-gp.h
new file mode 100644
index 000000000000..c88d346b59d9
--- /dev/null
+++ b/arch/arm/plat-omap/include/mach/timer-gp.h
@@ -0,0 +1,17 @@
+/*
+ * OMAP2/3 GPTIMER support.headers
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef __ARCH_ARM_PLAT_OMAP_INCLUDE_MACH_TIMER_GP_H
+#define __ARCH_ARM_PLAT_OMAP_INCLUDE_MACH_TIMER_GP_H
+
+int __init omap2_gp_clockevent_set_gptimer(u8 id);
+
+#endif
+