Merge branch 'dev-dt-timer' of github.com:jonhunter/linux into omap-for-v3.8/dt

1 files changed, 170 insertions, 33 deletions

diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index 69e46631a7cd..0758bae3a57a 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -37,6 +37,8 @@
 #include <linux/clockchips.h>
 #include <linux/slab.h>
 #include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
 
 #include <asm/mach/time.h>
 #include <asm/smp_twd.h>
@@ -66,11 +68,13 @@
 #define OMAP3_CLKEV_SOURCE      OMAP3_32K_SOURCE
 #define OMAP4_CLKEV_SOURCE      OMAP4_32K_SOURCE
 #define OMAP3_SECURE_TIMER      12
+#define TIMER_PROP_SECURE       "ti,timer-secure"
 #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
+#define TIMER_PROP_SECURE       "ti,timer-alwon"
 #endif
 
 #define REALTIME_COUNTER_BASE                           0x48243200
@@ -144,36 +148,141 @@ static struct clock_event_device clockevent_gpt = {
         .set_mode       = omap2_gp_timer_set_mode,
 };
 
+static struct property device_disabled = {
+        .name = "status",
+        .length = sizeof("disabled"),
+        .value = "disabled",
+};
+
+static struct of_device_id omap_timer_match[] __initdata = {
+        { .compatible = "ti,omap2-timer", },
+        { }
+};
+
+static struct of_device_id omap_counter_match[] __initdata = {
+        { .compatible = "ti,omap-counter32k", },
+        { }
+};
+
+/**
+ * omap_get_timer_dt - get a timer using device-tree
+ * @match       - device-tree match structure for matching a device type
+ * @property    - optional timer property to match
+ *
+ * Helper function to get a timer during early boot using device-tree for use
+ * as kernel system timer. Optionally, the property argument can be used to
+ * select a timer with a specific property. Once a timer is found then mark
+ * the timer node in device-tree as disabled, to prevent the kernel from
+ * registering this timer as a platform device and so no one else can use it.
+ */
+static struct device_node * __init omap_get_timer_dt(struct of_device_id *match,
+                                                     const char *property)
+{
+        struct device_node *np;
+
+        for_each_matching_node(np, match) {
+                if (!of_device_is_available(np)) {
+                        of_node_put(np);
+                        continue;
+                }
+
+                if (property && !of_get_property(np, property, NULL)) {
+                        of_node_put(np);
+                        continue;
+                }
+
+                prom_add_property(np, &device_disabled);
+                return np;
+        }
+
+        return NULL;
+}
+
+/**
+ * omap_dmtimer_init - initialisation function when device tree is used
+ *
+ * For secure OMAP3 devices, timers with device type "timer-secure" cannot
+ * be used by the kernel as they are reserved. Therefore, to prevent the
+ * kernel registering these devices remove them dynamically from the device
+ * tree on boot.
+ */
+void __init omap_dmtimer_init(void)
+{
+        struct device_node *np;
+
+        if (!cpu_is_omap34xx())
+                return;
+
+        /* If we are a secure device, remove any secure timer nodes */
+        if ((omap_type() != OMAP2_DEVICE_TYPE_GP)) {
+                np = omap_get_timer_dt(omap_timer_match, "ti,timer-secure");
+                if (np)
+                        of_node_put(np);
+        }
+}
+
 static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
                                                 int gptimer_id,
-                                                const char *fck_source)
+                                                const char *fck_source,
+                                                const char *property)
 {
         char name[10]; /* 10 = sizeof("gptXX_Xck0") */
+        const char *oh_name;
+        struct device_node *np;
         struct omap_hwmod *oh;
         struct resource irq_rsrc, mem_rsrc;
         size_t size;
         int res = 0;
         int r;
 
-        sprintf(name, "timer%d", gptimer_id);
-        omap_hwmod_setup_one(name);
-        oh = omap_hwmod_lookup(name);
+        if (of_have_populated_dt()) {
+                np = omap_get_timer_dt(omap_timer_match, NULL);
+                if (!np)
+                        return -ENODEV;
+
+                of_property_read_string_index(np, "ti,hwmods", 0, &oh_name);
+                if (!oh_name)
+                        return -ENODEV;
+
+                timer->irq = irq_of_parse_and_map(np, 0);
+                if (!timer->irq)
+                        return -ENXIO;
+
+                timer->io_base = of_iomap(np, 0);
+
+                of_node_put(np);
+        } else {
+                if (omap_dm_timer_reserve_systimer(gptimer_id))
+                        return -ENODEV;
+
+                sprintf(name, "timer%d", gptimer_id);
+                oh_name = name;
+        }
+
+        omap_hwmod_setup_one(oh_name);
+        oh = omap_hwmod_lookup(oh_name);
+
         if (!oh)
                 return -ENODEV;
 
-        r = omap_hwmod_get_resource_byname(oh, IORESOURCE_IRQ, NULL, &irq_rsrc);
-        if (r)
-                return -ENXIO;
-        timer->irq = irq_rsrc.start;
-
-        r = omap_hwmod_get_resource_byname(oh, IORESOURCE_MEM, NULL, &mem_rsrc);
-        if (r)
-                return -ENXIO;
-        timer->phys_base = mem_rsrc.start;
-        size = mem_rsrc.end - mem_rsrc.start;
+        if (!of_have_populated_dt()) {
+                r = omap_hwmod_get_resource_byname(oh, IORESOURCE_IRQ, NULL,
+                                                   &irq_rsrc);
+                if (r)
+                        return -ENXIO;
+                timer->irq = irq_rsrc.start;
+
+                r = omap_hwmod_get_resource_byname(oh, IORESOURCE_MEM, NULL,
+                                                   &mem_rsrc);
+                if (r)
+                        return -ENXIO;
+                timer->phys_base = mem_rsrc.start;
+                size = mem_rsrc.end - mem_rsrc.start;
+
+                /* Static mapping, never released */
+                timer->io_base = ioremap(timer->phys_base, size);
+        }
 
-        /* Static mapping, never released */
-        timer->io_base = ioremap(timer->phys_base, size);
         if (!timer->io_base)
                 return -ENXIO;
 
@@ -184,9 +293,7 @@ static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
 
         omap_hwmod_enable(oh);
 
-        if (omap_dm_timer_reserve_systimer(gptimer_id))
-                return -ENODEV;
-
+        /* FIXME: Need to remove hard-coded test on timer ID */
         if (gptimer_id != 12) {
                 struct clk *src;
 
@@ -196,8 +303,8 @@ static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
                 } 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);
+                                pr_warn("%s: %s cannot set source\n",
+                                        __func__, oh->name);
                         clk_put(src);
                 }
         }
@@ -213,11 +320,12 @@ static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
 }
 
 static void __init omap2_gp_clockevent_init(int gptimer_id,
-                                                const char *fck_source)
+                                                const char *fck_source,
+                                                const char *property)
 {
         int res;
 
-        res = omap_dm_timer_init_one(&clkev, gptimer_id, fck_source);
+        res = omap_dm_timer_init_one(&clkev, gptimer_id, fck_source, property);
         BUG_ON(res);
 
         omap2_gp_timer_irq.dev_id = &clkev;
@@ -274,11 +382,26 @@ static u32 notrace dmtimer_read_sched_clock(void)
 static int __init omap2_sync32k_clocksource_init(void)
 {
         int ret;
+        struct device_node *np = NULL;
         struct omap_hwmod *oh;
         void __iomem *vbase;
         const char *oh_name = "counter_32k";
 
         /*
+         * If device-tree is present, then search the DT blob
+         * to see if the 32kHz counter is supported.
+         */
+        if (of_have_populated_dt()) {
+                np = omap_get_timer_dt(omap_counter_match, NULL);
+                if (!np)
+                        return -ENODEV;
+
+                of_property_read_string_index(np, "ti,hwmods", 0, &oh_name);
+                if (!oh_name)
+                        return -ENODEV;
+        }
+
+        /*
          * First check hwmod data is available for sync32k counter
          */
         oh = omap_hwmod_lookup(oh_name);
@@ -287,7 +410,13 @@ static int __init omap2_sync32k_clocksource_init(void)
 
         omap_hwmod_setup_one(oh_name);
 
-        vbase = omap_hwmod_get_mpu_rt_va(oh);
+        if (np) {
+                vbase = of_iomap(np, 0);
+                of_node_put(np);
+        } else {
+                vbase = omap_hwmod_get_mpu_rt_va(oh);
+        }
+
         if (!vbase) {
                 pr_warn("%s: failed to get counter_32k resource\n", __func__);
                 return -ENXIO;
@@ -321,7 +450,7 @@ static void __init omap2_gptimer_clocksource_init(int gptimer_id,
 {
         int res;
 
-        res = omap_dm_timer_init_one(&clksrc, gptimer_id, fck_source);
+        res = omap_dm_timer_init_one(&clksrc, gptimer_id, fck_source, NULL);
         BUG_ON(res);
 
         __omap_dm_timer_load_start(&clksrc,
@@ -433,11 +562,12 @@ static inline void __init realtime_counter_init(void)
 {}
 #endif
 
-#define OMAP_SYS_TIMER_INIT(name, clkev_nr, clkev_src,                  \
+#define OMAP_SYS_TIMER_INIT(name, clkev_nr, clkev_src, clkev_prop,      \
                                 clksrc_nr, clksrc_src)                  \
 static void __init omap##name##_timer_init(void)                        \
 {                                                                       \
-        omap2_gp_clockevent_init((clkev_nr), clkev_src);                \
+        omap_dmtimer_init();                                            \
+        omap2_gp_clockevent_init((clkev_nr), clkev_src, clkev_prop);    \
         omap2_clocksource_init((clksrc_nr), clksrc_src);                \
 }
 
@@ -447,20 +577,23 @@ struct sys_timer omap##name##_timer = {					\
 };
 
 #ifdef CONFIG_ARCH_OMAP2
-OMAP_SYS_TIMER_INIT(2, 1, OMAP2_CLKEV_SOURCE, 2, OMAP2_MPU_SOURCE)
+OMAP_SYS_TIMER_INIT(2, 1, OMAP2_CLKEV_SOURCE, "ti,timer-alwon",
+                    2, OMAP2_MPU_SOURCE)
 OMAP_SYS_TIMER(2)
 #endif
 
 #ifdef CONFIG_ARCH_OMAP3
-OMAP_SYS_TIMER_INIT(3, 1, OMAP3_CLKEV_SOURCE, 2, OMAP3_MPU_SOURCE)
+OMAP_SYS_TIMER_INIT(3, 1, OMAP3_CLKEV_SOURCE, "ti,timer-alwon",
+                    2, OMAP3_MPU_SOURCE)
 OMAP_SYS_TIMER(3)
 OMAP_SYS_TIMER_INIT(3_secure, OMAP3_SECURE_TIMER, OMAP3_CLKEV_SOURCE,
-                        2, OMAP3_MPU_SOURCE)
+                        TIMER_PROP_SECURE, 2, OMAP3_MPU_SOURCE)
 OMAP_SYS_TIMER(3_secure)
 #endif
 
 #ifdef CONFIG_SOC_AM33XX
-OMAP_SYS_TIMER_INIT(3_am33xx, 1, OMAP4_MPU_SOURCE, 2, OMAP4_MPU_SOURCE)
+OMAP_SYS_TIMER_INIT(3_am33xx, 1, OMAP4_MPU_SOURCE, "ti,timer-alwon",
+                    2, OMAP4_MPU_SOURCE)
 OMAP_SYS_TIMER(3_am33xx)
 #endif
 
@@ -472,7 +605,7 @@ static DEFINE_TWD_LOCAL_TIMER(twd_local_timer,
 
 static void __init omap4_timer_init(void)
 {
-        omap2_gp_clockevent_init(1, OMAP4_CLKEV_SOURCE);
+        omap2_gp_clockevent_init(1, OMAP4_CLKEV_SOURCE, "ti,timer-alwon");
         omap2_clocksource_init(2, OMAP4_MPU_SOURCE);
 #ifdef CONFIG_LOCAL_TIMERS
         /* Local timers are not supprted on OMAP4430 ES1.0 */
@@ -498,7 +631,7 @@ static void __init omap5_timer_init(void)
 {
         int err;
 
-        omap2_gp_clockevent_init(1, OMAP4_CLKEV_SOURCE);
+        omap2_gp_clockevent_init(1, OMAP4_CLKEV_SOURCE, "ti,timer-alwon");
         omap2_clocksource_init(2, OMAP4_MPU_SOURCE);
         realtime_counter_init();
 
@@ -583,6 +716,10 @@ static int __init omap2_dm_timer_init(void)
 {
         int ret;
 
+        /* If dtb is there, the devices will be created dynamically */
+        if (of_have_populated_dt())
+                return -ENODEV;
+
         ret = omap_hwmod_for_each_by_class("timer", omap_timer_init, NULL);
         if (unlikely(ret)) {
                 pr_err("%s: device registration failed.\n", __func__);