1 files changed, 182 insertions, 12 deletions

diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index cf1de7d2630d..e49fc7be2229 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -35,6 +35,7 @@
 #include <linux/irq.h>
 #include <linux/clocksource.h>
 #include <linux/clockchips.h>
+#include <linux/slab.h>
 
 #include <asm/mach/time.h>
 #include <plat/dmtimer.h>
@@ -42,6 +43,10 @@
 #include <asm/sched_clock.h>
 #include <plat/common.h>
 #include <plat/omap_hwmod.h>
+#include <plat/omap_device.h>
+#include <plat/omap-pm.h>
+
+#include "powerdomain.h"
 
 /* Parent clocks, eventually these will come from the clock framework */
 
@@ -67,7 +72,7 @@
 /* MAX_GPTIMER_ID: number of GPTIMERs on the chip */
 #define MAX_GPTIMER_ID          12
 
-u32 sys_timer_reserved;
+static u32 sys_timer_reserved;
 
 /* Clockevent code */
 
@@ -78,7 +83,7 @@ static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id)
 {
         struct clock_event_device *evt = &clockevent_gpt;
 
-        __omap_dm_timer_write_status(clkev.io_base, OMAP_TIMER_INT_OVERFLOW);
+        __omap_dm_timer_write_status(&clkev, OMAP_TIMER_INT_OVERFLOW);
 
         evt->event_handler(evt);
         return IRQ_HANDLED;
@@ -93,7 +98,7 @@ 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_load_start(clkev.io_base, OMAP_TIMER_CTRL_ST,
+        __omap_dm_timer_load_start(&clkev, OMAP_TIMER_CTRL_ST,
                                                 0xffffffff - cycles, 1);
 
         return 0;
@@ -104,16 +109,16 @@ static void omap2_gp_timer_set_mode(enum clock_event_mode mode,
 {
         u32 period;
 
-        __omap_dm_timer_stop(clkev.io_base, 1, clkev.rate);
+        __omap_dm_timer_stop(&clkev, 1, clkev.rate);
 
         switch (mode) {
         case CLOCK_EVT_MODE_PERIODIC:
                 period = clkev.rate / HZ;
                 period -= 1;
                 /* Looks like we need to first set the load value separately */
-                __omap_dm_timer_write(clkev.io_base, OMAP_TIMER_LOAD_REG,
+                __omap_dm_timer_write(&clkev, OMAP_TIMER_LOAD_REG,
                                         0xffffffff - period, 1);
-                __omap_dm_timer_load_start(clkev.io_base,
+                __omap_dm_timer_load_start(&clkev,
                                         OMAP_TIMER_CTRL_AR | OMAP_TIMER_CTRL_ST,
                                                 0xffffffff - period, 1);
                 break;
@@ -189,7 +194,8 @@ static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
                         clk_put(src);
                 }
         }
-        __omap_dm_timer_reset(timer->io_base, 1, 1);
+        __omap_dm_timer_init_regs(timer);
+        __omap_dm_timer_reset(timer, 1, 1);
         timer->posted = 1;
 
         timer->rate = clk_get_rate(timer->fclk);
@@ -210,7 +216,7 @@ static void __init omap2_gp_clockevent_init(int gptimer_id,
         omap2_gp_timer_irq.dev_id = (void *)&clkev;
         setup_irq(clkev.irq, &omap2_gp_timer_irq);
 
-        __omap_dm_timer_int_enable(clkev.io_base, OMAP_TIMER_INT_OVERFLOW);
+        __omap_dm_timer_int_enable(&clkev, OMAP_TIMER_INT_OVERFLOW);
 
         clockevent_gpt.mult = div_sc(clkev.rate, NSEC_PER_SEC,
                                      clockevent_gpt.shift);
@@ -251,7 +257,7 @@ static struct omap_dm_timer clksrc;
 static DEFINE_CLOCK_DATA(cd);
 static cycle_t clocksource_read_cycles(struct clocksource *cs)
 {
-        return (cycle_t)__omap_dm_timer_read_counter(clksrc.io_base, 1);
+        return (cycle_t)__omap_dm_timer_read_counter(&clksrc, 1);
 }
 
 static struct clocksource clocksource_gpt = {
@@ -266,7 +272,7 @@ static void notrace dmtimer_update_sched_clock(void)
 {
         u32 cyc;
 
-        cyc = __omap_dm_timer_read_counter(clksrc.io_base, 1);
+        cyc = __omap_dm_timer_read_counter(&clksrc, 1);
 
         update_sched_clock(&cd, cyc, (u32)~0);
 }
@@ -276,7 +282,7 @@ unsigned long long notrace sched_clock(void)
         u32 cyc = 0;
 
         if (clksrc.reserved)
-                cyc = __omap_dm_timer_read_counter(clksrc.io_base, 1);
+                cyc = __omap_dm_timer_read_counter(&clksrc, 1);
 
         return cyc_to_sched_clock(&cd, cyc, (u32)~0);
 }
@@ -293,7 +299,7 @@ static void __init omap2_gp_clocksource_init(int gptimer_id,
         pr_info("OMAP clocksource: GPTIMER%d at %lu Hz\n",
                 gptimer_id, clksrc.rate);
 
-        __omap_dm_timer_load_start(clksrc.io_base,
+        __omap_dm_timer_load_start(&clksrc,
                         OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR, 0, 1);
         init_sched_clock(&cd, dmtimer_update_sched_clock, 32, clksrc.rate);
 
@@ -341,3 +347,167 @@ static void __init omap4_timer_init(void)
 }
 OMAP_SYS_TIMER(4)
 #endif
+
+/**
+ * omap2_dm_timer_set_src - change the timer input clock source
+ * @pdev:       timer platform device pointer
+ * @source:     array index of parent clock source
+ */
+static int omap2_dm_timer_set_src(struct platform_device *pdev, int source)
+{
+        int ret;
+        struct dmtimer_platform_data *pdata = pdev->dev.platform_data;
+        struct clk *fclk, *parent;
+        char *parent_name = NULL;
+
+        fclk = clk_get(&pdev->dev, "fck");
+        if (IS_ERR_OR_NULL(fclk)) {
+                dev_err(&pdev->dev, "%s: %d: clk_get() FAILED\n",
+                                __func__, __LINE__);
+                return -EINVAL;
+        }
+
+        switch (source) {
+        case OMAP_TIMER_SRC_SYS_CLK:
+                parent_name = "sys_ck";
+                break;
+
+        case OMAP_TIMER_SRC_32_KHZ:
+                parent_name = "32k_ck";
+                break;
+
+        case OMAP_TIMER_SRC_EXT_CLK:
+                if (pdata->timer_ip_version == OMAP_TIMER_IP_VERSION_1) {
+                        parent_name = "alt_ck";
+                        break;
+                }
+                dev_err(&pdev->dev, "%s: %d: invalid clk src.\n",
+                        __func__, __LINE__);
+                clk_put(fclk);
+                return -EINVAL;
+        }
+
+        parent = clk_get(&pdev->dev, parent_name);
+        if (IS_ERR_OR_NULL(parent)) {
+                dev_err(&pdev->dev, "%s: %d: clk_get() %s FAILED\n",
+                        __func__, __LINE__, parent_name);
+                clk_put(fclk);
+                return -EINVAL;
+        }
+
+        ret = clk_set_parent(fclk, parent);
+        if (IS_ERR_VALUE(ret)) {
+                dev_err(&pdev->dev, "%s: clk_set_parent() to %s FAILED\n",
+                        __func__, parent_name);
+                ret = -EINVAL;
+        }
+
+        clk_put(parent);
+        clk_put(fclk);
+
+        return ret;
+}
+
+struct omap_device_pm_latency omap2_dmtimer_latency[] = {
+        {
+                .deactivate_func = omap_device_idle_hwmods,
+                .activate_func   = omap_device_enable_hwmods,
+                .flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
+        },
+};
+
+/**
+ * omap_timer_init - build and register timer device with an
+ * associated timer hwmod
+ * @oh: timer hwmod pointer to be used to build timer device
+ * @user:       parameter that can be passed from calling hwmod API
+ *
+ * Called by omap_hwmod_for_each_by_class to register each of the timer
+ * devices present in the system. The number of timer devices is known
+ * by parsing through the hwmod database for a given class name. At the
+ * end of function call memory is allocated for timer device and it is
+ * registered to the framework ready to be proved by the driver.
+ */
+static int __init omap_timer_init(struct omap_hwmod *oh, void *unused)
+{
+        int id;
+        int ret = 0;
+        char *name = "omap_timer";
+        struct dmtimer_platform_data *pdata;
+        struct platform_device *pdev;
+        struct omap_timer_capability_dev_attr *timer_dev_attr;
+        struct powerdomain *pwrdm;
+
+        pr_debug("%s: %s\n", __func__, oh->name);
+
+        /* on secure device, do not register secure timer */
+        timer_dev_attr = oh->dev_attr;
+        if (omap_type() != OMAP2_DEVICE_TYPE_GP && timer_dev_attr)
+                if (timer_dev_attr->timer_capability == OMAP_TIMER_SECURE)
+                        return ret;
+
+        pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+        if (!pdata) {
+                pr_err("%s: No memory for [%s]\n", __func__, oh->name);
+                return -ENOMEM;
+        }
+
+        /*
+         * Extract the IDs from name field in hwmod database
+         * and use the same for constructing ids' for the
+         * timer devices. In a way, we are avoiding usage of
+         * static variable witin the function to do the same.
+         * CAUTION: We have to be careful and make sure the
+         * name in hwmod database does not change in which case
+         * we might either make corresponding change here or
+         * switch back static variable mechanism.
+         */
+        sscanf(oh->name, "timer%2d", &id);
+
+        pdata->set_timer_src = omap2_dm_timer_set_src;
+        pdata->timer_ip_version = oh->class->rev;
+
+        /* Mark clocksource and clockevent timers as reserved */
+        if ((sys_timer_reserved >> (id - 1)) & 0x1)
+                pdata->reserved = 1;
+
+        pwrdm = omap_hwmod_get_pwrdm(oh);
+        pdata->loses_context = pwrdm_can_ever_lose_context(pwrdm);
+#ifdef CONFIG_PM
+        pdata->get_context_loss_count = omap_pm_get_dev_context_loss_count;
+#endif
+        pdev = omap_device_build(name, id, oh, pdata, sizeof(*pdata),
+                        omap2_dmtimer_latency,
+                        ARRAY_SIZE(omap2_dmtimer_latency),
+                        0);
+
+        if (IS_ERR(pdev)) {
+                pr_err("%s: Can't build omap_device for %s: %s.\n",
+                        __func__, name, oh->name);
+                ret = -EINVAL;
+        }
+
+        kfree(pdata);
+
+        return ret;
+}
+
+/**
+ * omap2_dm_timer_init - top level regular device initialization
+ *
+ * Uses dedicated hwmod api to parse through hwmod database for
+ * given class name and then build and register the timer device.
+ */
+static int __init omap2_dm_timer_init(void)
+{
+        int ret;
+
+        ret = omap_hwmod_for_each_by_class("timer", omap_timer_init, NULL);
+        if (unlikely(ret)) {
+                pr_err("%s: device registration failed.\n", __func__);
+                return -EINVAL;
+        }
+
+        return 0;
+}
+arch_initcall(omap2_dm_timer_init);