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@@ -37,6 +37,10 @@
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#include <linux/clockchips.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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+#include <linux/of_address.h>
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+#include <linux/of_irq.h>
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+#include <linux/platform_device.h>
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+#include <linux/platform_data/dmtimer-omap.h>
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#include <asm/mach/time.h>
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#include <asm/smp_twd.h>
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@@ -62,18 +66,6 @@
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#define OMAP3_32K_SOURCE "omap_32k_fck"
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#define OMAP4_32K_SOURCE "sys_32k_ck"
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-#ifdef CONFIG_OMAP_32K_TIMER
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-#define OMAP2_CLKEV_SOURCE OMAP2_32K_SOURCE
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-#define OMAP3_CLKEV_SOURCE OMAP3_32K_SOURCE
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-#define OMAP4_CLKEV_SOURCE OMAP4_32K_SOURCE
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-#define OMAP3_SECURE_TIMER 12
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-#else
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-#define OMAP2_CLKEV_SOURCE OMAP2_MPU_SOURCE
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-#define OMAP3_CLKEV_SOURCE OMAP3_MPU_SOURCE
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-#define OMAP4_CLKEV_SOURCE OMAP4_MPU_SOURCE
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-#define OMAP3_SECURE_TIMER 1
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-#endif
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-
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#define REALTIME_COUNTER_BASE 0x48243200
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#define INCREMENTER_NUMERATOR_OFFSET 0x10
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#define INCREMENTER_DENUMERATOR_RELOAD_OFFSET 0x14
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@@ -104,7 +96,7 @@ static int omap2_gp_timer_set_next_event(unsigned long cycles,
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struct clock_event_device *evt)
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{
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__omap_dm_timer_load_start(&clkev, OMAP_TIMER_CTRL_ST,
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- 0xffffffff - cycles, 1);
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+ 0xffffffff - cycles, OMAP_TIMER_POSTED);
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return 0;
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}
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@@ -114,7 +106,7 @@ static void omap2_gp_timer_set_mode(enum clock_event_mode mode,
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{
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u32 period;
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- __omap_dm_timer_stop(&clkev, 1, clkev.rate);
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+ __omap_dm_timer_stop(&clkev, OMAP_TIMER_POSTED, clkev.rate);
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switch (mode) {
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case CLOCK_EVT_MODE_PERIODIC:
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@@ -122,10 +114,10 @@ static void omap2_gp_timer_set_mode(enum clock_event_mode mode,
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period -= 1;
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/* Looks like we need to first set the load value separately */
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__omap_dm_timer_write(&clkev, OMAP_TIMER_LOAD_REG,
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- 0xffffffff - period, 1);
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+ 0xffffffff - period, OMAP_TIMER_POSTED);
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__omap_dm_timer_load_start(&clkev,
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OMAP_TIMER_CTRL_AR | OMAP_TIMER_CTRL_ST,
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- 0xffffffff - period, 1);
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+ 0xffffffff - period, OMAP_TIMER_POSTED);
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break;
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case CLOCK_EVT_MODE_ONESHOT:
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break;
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@@ -145,36 +137,144 @@ static struct clock_event_device clockevent_gpt = {
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.set_mode = omap2_gp_timer_set_mode,
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};
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+static struct property device_disabled = {
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+ .name = "status",
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+ .length = sizeof("disabled"),
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+ .value = "disabled",
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+};
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+
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+static struct of_device_id omap_timer_match[] __initdata = {
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+ { .compatible = "ti,omap2-timer", },
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+ { }
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+};
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+
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+/**
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+ * omap_get_timer_dt - get a timer using device-tree
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+ * @match - device-tree match structure for matching a device type
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+ * @property - optional timer property to match
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+ *
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+ * Helper function to get a timer during early boot using device-tree for use
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+ * as kernel system timer. Optionally, the property argument can be used to
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+ * select a timer with a specific property. Once a timer is found then mark
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+ * the timer node in device-tree as disabled, to prevent the kernel from
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+ * registering this timer as a platform device and so no one else can use it.
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+ */
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+static struct device_node * __init omap_get_timer_dt(struct of_device_id *match,
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+ const char *property)
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+{
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+ struct device_node *np;
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+
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+ for_each_matching_node(np, match) {
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+ if (!of_device_is_available(np)) {
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+ of_node_put(np);
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+ continue;
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+ }
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+
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+ if (property && !of_get_property(np, property, NULL)) {
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+ of_node_put(np);
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+ continue;
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+ }
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+
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+ prom_add_property(np, &device_disabled);
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+ return np;
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+ }
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+
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+ return NULL;
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+}
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+
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+/**
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+ * omap_dmtimer_init - initialisation function when device tree is used
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+ *
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+ * For secure OMAP3 devices, timers with device type "timer-secure" cannot
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+ * be used by the kernel as they are reserved. Therefore, to prevent the
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+ * kernel registering these devices remove them dynamically from the device
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+ * tree on boot.
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+ */
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+void __init omap_dmtimer_init(void)
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+{
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+ struct device_node *np;
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+
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+ if (!cpu_is_omap34xx())
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+ return;
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+
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+ /* If we are a secure device, remove any secure timer nodes */
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+ if ((omap_type() != OMAP2_DEVICE_TYPE_GP)) {
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+ np = omap_get_timer_dt(omap_timer_match, "ti,timer-secure");
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+ if (np)
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+ of_node_put(np);
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+ }
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+}
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+
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+/**
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+ * omap_dm_timer_get_errata - get errata flags for a timer
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+ *
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+ * Get the timer errata flags that are specific to the OMAP device being used.
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+ */
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+u32 __init omap_dm_timer_get_errata(void)
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+{
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+ if (cpu_is_omap24xx())
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+ return 0;
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+
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+ return OMAP_TIMER_ERRATA_I103_I767;
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+}
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+
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static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
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int gptimer_id,
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- const char *fck_source)
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+ const char *fck_source,
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+ const char *property,
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+ int posted)
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{
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char name[10]; /* 10 = sizeof("gptXX_Xck0") */
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+ const char *oh_name;
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+ struct device_node *np;
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struct omap_hwmod *oh;
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- struct resource irq_rsrc, mem_rsrc;
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- size_t size;
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- int res = 0;
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- int r;
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-
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- sprintf(name, "timer%d", gptimer_id);
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- omap_hwmod_setup_one(name);
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- oh = omap_hwmod_lookup(name);
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+ struct resource irq, mem;
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+ int r = 0;
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+
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+ if (of_have_populated_dt()) {
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+ np = omap_get_timer_dt(omap_timer_match, NULL);
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+ if (!np)
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+ return -ENODEV;
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+
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+ of_property_read_string_index(np, "ti,hwmods", 0, &oh_name);
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+ if (!oh_name)
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+ return -ENODEV;
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+
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+ timer->irq = irq_of_parse_and_map(np, 0);
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+ if (!timer->irq)
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+ return -ENXIO;
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+
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+ timer->io_base = of_iomap(np, 0);
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+
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+ of_node_put(np);
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+ } else {
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+ if (omap_dm_timer_reserve_systimer(gptimer_id))
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+ return -ENODEV;
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+
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+ sprintf(name, "timer%d", gptimer_id);
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+ oh_name = name;
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+ }
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+
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+ oh = omap_hwmod_lookup(oh_name);
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if (!oh)
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return -ENODEV;
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- r = omap_hwmod_get_resource_byname(oh, IORESOURCE_IRQ, NULL, &irq_rsrc);
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- if (r)
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- return -ENXIO;
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- timer->irq = irq_rsrc.start;
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+ if (!of_have_populated_dt()) {
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+ r = omap_hwmod_get_resource_byname(oh, IORESOURCE_IRQ, NULL,
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+ &irq);
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+ if (r)
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+ return -ENXIO;
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+ timer->irq = irq.start;
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- r = omap_hwmod_get_resource_byname(oh, IORESOURCE_MEM, NULL, &mem_rsrc);
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- if (r)
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- return -ENXIO;
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- timer->phys_base = mem_rsrc.start;
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- size = mem_rsrc.end - mem_rsrc.start;
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+ r = omap_hwmod_get_resource_byname(oh, IORESOURCE_MEM, NULL,
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+ &mem);
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+ if (r)
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+ return -ENXIO;
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+
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+ /* Static mapping, never released */
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+ timer->io_base = ioremap(mem.start, mem.end - mem.start);
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+ }
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- /* Static mapping, never released */
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- timer->io_base = ioremap(timer->phys_base, size);
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if (!timer->io_base)
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return -ENXIO;
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@@ -183,42 +283,56 @@ static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
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if (IS_ERR(timer->fclk))
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return -ENODEV;
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- omap_hwmod_enable(oh);
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-
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- if (omap_dm_timer_reserve_systimer(gptimer_id))
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- return -ENODEV;
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-
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+ /* FIXME: Need to remove hard-coded test on timer ID */
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if (gptimer_id != 12) {
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struct clk *src;
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src = clk_get(NULL, fck_source);
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if (IS_ERR(src)) {
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- res = -EINVAL;
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+ r = -EINVAL;
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} else {
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- res = __omap_dm_timer_set_source(timer->fclk, src);
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- if (IS_ERR_VALUE(res))
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- pr_warning("%s: timer%i cannot set source\n",
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- __func__, gptimer_id);
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+ r = clk_set_parent(timer->fclk, src);
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+ if (IS_ERR_VALUE(r))
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+ pr_warn("%s: %s cannot set source\n",
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+ __func__, oh->name);
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clk_put(src);
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}
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}
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+
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+ omap_hwmod_setup_one(oh_name);
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+ omap_hwmod_enable(oh);
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__omap_dm_timer_init_regs(timer);
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- __omap_dm_timer_reset(timer, 1, 1);
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- timer->posted = 1;
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- timer->rate = clk_get_rate(timer->fclk);
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+ if (posted)
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+ __omap_dm_timer_enable_posted(timer);
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+
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+ /* Check that the intended posted configuration matches the actual */
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+ if (posted != timer->posted)
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+ return -EINVAL;
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+ timer->rate = clk_get_rate(timer->fclk);
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timer->reserved = 1;
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- return res;
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+ return r;
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}
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static void __init omap2_gp_clockevent_init(int gptimer_id,
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- const char *fck_source)
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+ const char *fck_source,
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+ const char *property)
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{
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int res;
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- res = omap_dm_timer_init_one(&clkev, gptimer_id, fck_source);
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+ clkev.errata = omap_dm_timer_get_errata();
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+
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+ /*
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+ * For clock-event timers we never read the timer counter and
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+ * so we are not impacted by errata i103 and i767. Therefore,
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+ * we can safely ignore this errata for clock-event timers.
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+ */
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+ __omap_dm_timer_override_errata(&clkev, OMAP_TIMER_ERRATA_I103_I767);
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+
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+ res = omap_dm_timer_init_one(&clkev, gptimer_id, fck_source, property,
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+ OMAP_TIMER_POSTED);
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BUG_ON(res);
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omap2_gp_timer_irq.dev_id = &clkev;
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@@ -251,7 +365,8 @@ static bool use_gptimer_clksrc;
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*/
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static cycle_t clocksource_read_cycles(struct clocksource *cs)
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{
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- return (cycle_t)__omap_dm_timer_read_counter(&clksrc, 1);
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+ return (cycle_t)__omap_dm_timer_read_counter(&clksrc,
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+ OMAP_TIMER_NONPOSTED);
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}
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static struct clocksource clocksource_gpt = {
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@@ -265,20 +380,40 @@ static struct clocksource clocksource_gpt = {
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static u32 notrace dmtimer_read_sched_clock(void)
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{
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if (clksrc.reserved)
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- return __omap_dm_timer_read_counter(&clksrc, 1);
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+ return __omap_dm_timer_read_counter(&clksrc,
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+ OMAP_TIMER_NONPOSTED);
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return 0;
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}
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-#ifdef CONFIG_OMAP_32K_TIMER
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+static struct of_device_id omap_counter_match[] __initdata = {
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+ { .compatible = "ti,omap-counter32k", },
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+ { }
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+};
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+
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/* Setup free-running counter for clocksource */
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static int __init omap2_sync32k_clocksource_init(void)
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{
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int ret;
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+ struct device_node *np = NULL;
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struct omap_hwmod *oh;
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void __iomem *vbase;
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const char *oh_name = "counter_32k";
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+ /*
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+ * If device-tree is present, then search the DT blob
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+ * to see if the 32kHz counter is supported.
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+ */
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+ if (of_have_populated_dt()) {
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+ np = omap_get_timer_dt(omap_counter_match, NULL);
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+ if (!np)
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+ return -ENODEV;
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+
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+ of_property_read_string_index(np, "ti,hwmods", 0, &oh_name);
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+ if (!oh_name)
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+ return -ENODEV;
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+ }
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+
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/*
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* First check hwmod data is available for sync32k counter
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*/
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@@ -288,7 +423,13 @@ static int __init omap2_sync32k_clocksource_init(void)
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omap_hwmod_setup_one(oh_name);
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- vbase = omap_hwmod_get_mpu_rt_va(oh);
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+ if (np) {
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+ vbase = of_iomap(np, 0);
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+ of_node_put(np);
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+ } else {
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+ vbase = omap_hwmod_get_mpu_rt_va(oh);
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+ }
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+
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if (!vbase) {
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pr_warn("%s: failed to get counter_32k resource\n", __func__);
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return -ENXIO;
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@@ -310,23 +451,21 @@ static int __init omap2_sync32k_clocksource_init(void)
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return ret;
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}
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-#else
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-static inline int omap2_sync32k_clocksource_init(void)
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-{
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- return -ENODEV;
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-}
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-#endif
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static void __init omap2_gptimer_clocksource_init(int gptimer_id,
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const char *fck_source)
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{
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int res;
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- res = omap_dm_timer_init_one(&clksrc, gptimer_id, fck_source);
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+ clksrc.errata = omap_dm_timer_get_errata();
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+
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+ res = omap_dm_timer_init_one(&clksrc, gptimer_id, fck_source, NULL,
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+ OMAP_TIMER_NONPOSTED);
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BUG_ON(res);
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__omap_dm_timer_load_start(&clksrc,
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- OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR, 0, 1);
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+ OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR, 0,
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+ OMAP_TIMER_NONPOSTED);
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setup_sched_clock(dmtimer_read_sched_clock, 32, clksrc.rate);
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if (clocksource_register_hz(&clocksource_gpt, clksrc.rate))
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@@ -337,25 +476,6 @@ static void __init omap2_gptimer_clocksource_init(int gptimer_id,
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gptimer_id, clksrc.rate);
|
|
|
}
|
|
|
|
|
|
-static void __init omap2_clocksource_init(int gptimer_id,
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|
|
- const char *fck_source)
|
|
|
-{
|
|
|
- /*
|
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|
- * First give preference to kernel parameter configuration
|
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|
- * by user (clocksource="gp_timer").
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|
|
- *
|
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|
- * In case of missing kernel parameter for clocksource,
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|
- * first check for availability for 32k-sync timer, in case
|
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|
- * of failure in finding 32k_counter module or registering
|
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|
- * it as clocksource, execution will fallback to gp-timer.
|
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|
- */
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- if (use_gptimer_clksrc == true)
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- omap2_gptimer_clocksource_init(gptimer_id, fck_source);
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- else if (omap2_sync32k_clocksource_init())
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|
- /* Fall back to gp-timer code */
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|
- omap2_gptimer_clocksource_init(gptimer_id, fck_source);
|
|
|
-}
|
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|
-
|
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|
#ifdef CONFIG_SOC_HAS_REALTIME_COUNTER
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/*
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* The realtime counter also called master counter, is a free-running
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@@ -434,48 +554,65 @@ static inline void __init realtime_counter_init(void)
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|
{}
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|
#endif
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|
|
|
|
|
-#define OMAP_SYS_TIMER_INIT(name, clkev_nr, clkev_src, \
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|
+#define OMAP_SYS_GP_TIMER_INIT(name, clkev_nr, clkev_src, clkev_prop, \
|
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|
+ clksrc_nr, clksrc_src) \
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|
+static void __init omap##name##_gptimer_timer_init(void) \
|
|
|
+{ \
|
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|
+ omap_dmtimer_init(); \
|
|
|
+ omap2_gp_clockevent_init((clkev_nr), clkev_src, clkev_prop); \
|
|
|
+ omap2_gptimer_clocksource_init((clksrc_nr), clksrc_src); \
|
|
|
+}
|
|
|
+
|
|
|
+#define OMAP_SYS_32K_TIMER_INIT(name, clkev_nr, clkev_src, clkev_prop, \
|
|
|
clksrc_nr, clksrc_src) \
|
|
|
-static void __init omap##name##_timer_init(void) \
|
|
|
+static void __init omap##name##_sync32k_timer_init(void) \
|
|
|
{ \
|
|
|
- omap2_gp_clockevent_init((clkev_nr), clkev_src); \
|
|
|
- omap2_clocksource_init((clksrc_nr), clksrc_src); \
|
|
|
+ omap_dmtimer_init(); \
|
|
|
+ omap2_gp_clockevent_init((clkev_nr), clkev_src, clkev_prop); \
|
|
|
+ /* Enable the use of clocksource="gp_timer" kernel parameter */ \
|
|
|
+ if (use_gptimer_clksrc) \
|
|
|
+ omap2_gptimer_clocksource_init((clksrc_nr), clksrc_src);\
|
|
|
+ else \
|
|
|
+ omap2_sync32k_clocksource_init(); \
|
|
|
}
|
|
|
|
|
|
-#define OMAP_SYS_TIMER(name) \
|
|
|
+#define OMAP_SYS_TIMER(name, clksrc) \
|
|
|
struct sys_timer omap##name##_timer = { \
|
|
|
- .init = omap##name##_timer_init, \
|
|
|
+ .init = omap##name##_##clksrc##_timer_init, \
|
|
|
};
|
|
|
|
|
|
#ifdef CONFIG_ARCH_OMAP2
|
|
|
-OMAP_SYS_TIMER_INIT(2, 1, OMAP2_CLKEV_SOURCE, 2, OMAP2_MPU_SOURCE)
|
|
|
-OMAP_SYS_TIMER(2)
|
|
|
-#endif
|
|
|
+OMAP_SYS_32K_TIMER_INIT(2, 1, OMAP2_32K_SOURCE, "ti,timer-alwon",
|
|
|
+ 2, OMAP2_MPU_SOURCE);
|
|
|
+OMAP_SYS_TIMER(2, sync32k);
|
|
|
+#endif /* CONFIG_ARCH_OMAP2 */
|
|
|
|
|
|
#ifdef CONFIG_ARCH_OMAP3
|
|
|
-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,
|
|
|
- 2, OMAP3_MPU_SOURCE)
|
|
|
-OMAP_SYS_TIMER(3_secure)
|
|
|
-#endif
|
|
|
+OMAP_SYS_32K_TIMER_INIT(3, 1, OMAP3_32K_SOURCE, "ti,timer-alwon",
|
|
|
+ 2, OMAP3_MPU_SOURCE);
|
|
|
+OMAP_SYS_TIMER(3, sync32k);
|
|
|
+OMAP_SYS_32K_TIMER_INIT(3_secure, 12, OMAP3_32K_SOURCE, "ti,timer-secure",
|
|
|
+ 2, OMAP3_MPU_SOURCE);
|
|
|
+OMAP_SYS_TIMER(3_secure, sync32k);
|
|
|
+OMAP_SYS_GP_TIMER_INIT(3_gp, 1, OMAP3_MPU_SOURCE, "ti,timer-alwon",
|
|
|
+ 2, OMAP3_MPU_SOURCE);
|
|
|
+OMAP_SYS_TIMER(3_gp, gptimer);
|
|
|
+#endif /* CONFIG_ARCH_OMAP3 */
|
|
|
|
|
|
#ifdef CONFIG_SOC_AM33XX
|
|
|
-OMAP_SYS_TIMER_INIT(3_am33xx, 1, OMAP4_MPU_SOURCE, 2, OMAP4_MPU_SOURCE)
|
|
|
-OMAP_SYS_TIMER(3_am33xx)
|
|
|
-#endif
|
|
|
+OMAP_SYS_GP_TIMER_INIT(3_am33xx, 1, OMAP4_MPU_SOURCE, "ti,timer-alwon",
|
|
|
+ 2, OMAP4_MPU_SOURCE);
|
|
|
+OMAP_SYS_TIMER(3_am33xx, gptimer);
|
|
|
+#endif /* CONFIG_SOC_AM33XX */
|
|
|
|
|
|
#ifdef CONFIG_ARCH_OMAP4
|
|
|
+OMAP_SYS_32K_TIMER_INIT(4, 1, OMAP4_32K_SOURCE, "ti,timer-alwon",
|
|
|
+ 2, OMAP4_MPU_SOURCE);
|
|
|
#ifdef CONFIG_LOCAL_TIMERS
|
|
|
-static DEFINE_TWD_LOCAL_TIMER(twd_local_timer,
|
|
|
- OMAP44XX_LOCAL_TWD_BASE, 29);
|
|
|
-#endif
|
|
|
-
|
|
|
-static void __init omap4_timer_init(void)
|
|
|
+static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, OMAP44XX_LOCAL_TWD_BASE, 29);
|
|
|
+static void __init omap4_local_timer_init(void)
|
|
|
{
|
|
|
- omap2_gp_clockevent_init(1, OMAP4_CLKEV_SOURCE);
|
|
|
- omap2_clocksource_init(2, OMAP4_MPU_SOURCE);
|
|
|
-#ifdef CONFIG_LOCAL_TIMERS
|
|
|
+ omap4_sync32k_timer_init();
|
|
|
/* Local timers are not supprted on OMAP4430 ES1.0 */
|
|
|
if (omap_rev() != OMAP4430_REV_ES1_0) {
|
|
|
int err;
|
|
@@ -489,26 +626,32 @@ static void __init omap4_timer_init(void)
|
|
|
if (err)
|
|
|
pr_err("twd_local_timer_register failed %d\n", err);
|
|
|
}
|
|
|
-#endif
|
|
|
}
|
|
|
-OMAP_SYS_TIMER(4)
|
|
|
-#endif
|
|
|
+#else /* CONFIG_LOCAL_TIMERS */
|
|
|
+static inline void omap4_local_timer_init(void)
|
|
|
+{
|
|
|
+ omap4_sync32_timer_init();
|
|
|
+}
|
|
|
+#endif /* CONFIG_LOCAL_TIMERS */
|
|
|
+OMAP_SYS_TIMER(4, local);
|
|
|
+#endif /* CONFIG_ARCH_OMAP4 */
|
|
|
|
|
|
#ifdef CONFIG_SOC_OMAP5
|
|
|
-static void __init omap5_timer_init(void)
|
|
|
+OMAP_SYS_32K_TIMER_INIT(5, 1, OMAP4_32K_SOURCE, "ti,timer-alwon",
|
|
|
+ 2, OMAP4_MPU_SOURCE);
|
|
|
+static void __init omap5_realtime_timer_init(void)
|
|
|
{
|
|
|
int err;
|
|
|
|
|
|
- omap2_gp_clockevent_init(1, OMAP4_CLKEV_SOURCE);
|
|
|
- omap2_clocksource_init(2, OMAP4_MPU_SOURCE);
|
|
|
+ omap5_sync32k_timer_init();
|
|
|
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
|
|
|
+OMAP_SYS_TIMER(5, realtime);
|
|
|
+#endif /* CONFIG_SOC_OMAP5 */
|
|
|
|
|
|
/**
|
|
|
* omap_timer_init - build and register timer device with an
|
|
@@ -560,6 +703,7 @@ static int __init omap_timer_init(struct omap_hwmod *oh, void *unused)
|
|
|
if (timer_dev_attr)
|
|
|
pdata->timer_capability = timer_dev_attr->timer_capability;
|
|
|
|
|
|
+ pdata->timer_errata = omap_dm_timer_get_errata();
|
|
|
pdata->get_context_loss_count = omap_pm_get_dev_context_loss_count;
|
|
|
|
|
|
pdev = omap_device_build(name, id, oh, pdata, sizeof(*pdata),
|
|
@@ -586,6 +730,10 @@ 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__);
|