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authorOlof Johansson <olof@lixom.net>2013-04-14 20:49:21 -0700
committerOlof Johansson <olof@lixom.net>2013-04-14 20:49:28 -0700
commitb56a7f9206efa2982140837e36aca88cfedd66bc (patch)
treea1270fbf47cbaf6e056b2a06ede71cd622df987a /arch/arm/mach-msm/timer.c
parent56c5c13f7080f9299a92b3fb6a1bf22689d607cc (diff)
parente25e3d1fef2c57e49aef64535341c15fe2b29b4a (diff)
Merge tag 'msm-core-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/davidb/linux-msm into next/soc
From David Brown: Patches for MSM core These patches are changes to the MSM timer code that will be for upcoming targets, including a generalization of the binding and preventing a missing timer interrupt. * tag 'msm-core-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/davidb/linux-msm: ARM: msm: Wait for timer clear to complete ARM: msm: Rework timer binding to be more general Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch/arm/mach-msm/timer.c')
-rw-r--r--arch/arm/mach-msm/timer.c110
1 files changed, 51 insertions, 59 deletions
diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c
index f9fd77e8f1f5..284313f3e02c 100644
--- a/arch/arm/mach-msm/timer.c
+++ b/arch/arm/mach-msm/timer.c
@@ -30,19 +30,22 @@
#include "common.h"
-#define TIMER_MATCH_VAL 0x0000
-#define TIMER_COUNT_VAL 0x0004
-#define TIMER_ENABLE 0x0008
-#define TIMER_ENABLE_CLR_ON_MATCH_EN BIT(1)
-#define TIMER_ENABLE_EN BIT(0)
-#define TIMER_CLEAR 0x000C
-#define DGT_CLK_CTL_DIV_4 0x3
+#define TIMER_MATCH_VAL 0x0000
+#define TIMER_COUNT_VAL 0x0004
+#define TIMER_ENABLE 0x0008
+#define TIMER_ENABLE_CLR_ON_MATCH_EN BIT(1)
+#define TIMER_ENABLE_EN BIT(0)
+#define TIMER_CLEAR 0x000C
+#define DGT_CLK_CTL 0x10
+#define DGT_CLK_CTL_DIV_4 0x3
+#define TIMER_STS_GPT0_CLR_PEND BIT(10)
#define GPT_HZ 32768
#define MSM_DGT_SHIFT 5
static void __iomem *event_base;
+static void __iomem *sts_base;
static irqreturn_t msm_timer_interrupt(int irq, void *dev_id)
{
@@ -67,6 +70,11 @@ static int msm_timer_set_next_event(unsigned long cycles,
writel_relaxed(ctrl, event_base + TIMER_CLEAR);
writel_relaxed(cycles, event_base + TIMER_MATCH_VAL);
+
+ if (sts_base)
+ while (readl_relaxed(sts_base) & TIMER_STS_GPT0_CLR_PEND)
+ cpu_relax();
+
writel_relaxed(ctrl | TIMER_ENABLE_EN, event_base + TIMER_ENABLE);
return 0;
}
@@ -137,9 +145,6 @@ static int __cpuinit msm_local_timer_setup(struct clock_event_device *evt)
if (!smp_processor_id())
return 0;
- writel_relaxed(0, event_base + TIMER_ENABLE);
- writel_relaxed(0, event_base + TIMER_CLEAR);
- writel_relaxed(~0, event_base + TIMER_MATCH_VAL);
evt->irq = msm_clockevent.irq;
evt->name = "local_timer";
evt->features = msm_clockevent.features;
@@ -177,9 +182,6 @@ static void __init msm_timer_init(u32 dgt_hz, int sched_bits, int irq,
struct clocksource *cs = &msm_clocksource;
int res;
- writel_relaxed(0, event_base + TIMER_ENABLE);
- writel_relaxed(0, event_base + TIMER_CLEAR);
- writel_relaxed(~0, event_base + TIMER_MATCH_VAL);
ce->cpumask = cpumask_of(0);
ce->irq = irq;
@@ -217,13 +219,9 @@ err:
}
#ifdef CONFIG_OF
-static const struct of_device_id msm_dgt_match[] __initconst = {
- { .compatible = "qcom,msm-dgt" },
- { },
-};
-
-static const struct of_device_id msm_gpt_match[] __initconst = {
- { .compatible = "qcom,msm-gpt" },
+static const struct of_device_id msm_timer_match[] __initconst = {
+ { .compatible = "qcom,kpss-timer" },
+ { .compatible = "qcom,scss-timer" },
{ },
};
@@ -234,33 +232,29 @@ void __init msm_dt_timer_init(void)
int irq;
struct resource res;
u32 percpu_offset;
- void __iomem *dgt_clk_ctl;
+ void __iomem *base;
+ void __iomem *cpu0_base;
- np = of_find_matching_node(NULL, msm_gpt_match);
+ np = of_find_matching_node(NULL, msm_timer_match);
if (!np) {
- pr_err("Can't find GPT DT node\n");
+ pr_err("Can't find msm timer DT node\n");
return;
}
- event_base = of_iomap(np, 0);
- if (!event_base) {
+ base = of_iomap(np, 0);
+ if (!base) {
pr_err("Failed to map event base\n");
return;
}
- irq = irq_of_parse_and_map(np, 0);
+ /* We use GPT0 for the clockevent */
+ irq = irq_of_parse_and_map(np, 1);
if (irq <= 0) {
pr_err("Can't get irq\n");
return;
}
- of_node_put(np);
-
- np = of_find_matching_node(NULL, msm_dgt_match);
- if (!np) {
- pr_err("Can't find DGT DT node\n");
- return;
- }
+ /* We use CPU0's DGT for the clocksource */
if (of_property_read_u32(np, "cpu-offset", &percpu_offset))
percpu_offset = 0;
@@ -269,45 +263,43 @@ void __init msm_dt_timer_init(void)
return;
}
- source_base = ioremap(res.start + percpu_offset, resource_size(&res));
- if (!source_base) {
+ cpu0_base = ioremap(res.start + percpu_offset, resource_size(&res));
+ if (!cpu0_base) {
pr_err("Failed to map source base\n");
return;
}
- if (!of_address_to_resource(np, 1, &res)) {
- dgt_clk_ctl = ioremap(res.start + percpu_offset,
- resource_size(&res));
- if (!dgt_clk_ctl) {
- pr_err("Failed to map DGT control base\n");
- return;
- }
- writel_relaxed(DGT_CLK_CTL_DIV_4, dgt_clk_ctl);
- iounmap(dgt_clk_ctl);
- }
-
if (of_property_read_u32(np, "clock-frequency", &freq)) {
pr_err("Unknown frequency\n");
return;
}
of_node_put(np);
+ event_base = base + 0x4;
+ sts_base = base + 0x88;
+ source_base = cpu0_base + 0x24;
+ freq /= 4;
+ writel_relaxed(DGT_CLK_CTL_DIV_4, source_base + DGT_CLK_CTL);
+
msm_timer_init(freq, 32, irq, !!percpu_offset);
}
#endif
-static int __init msm_timer_map(phys_addr_t event, phys_addr_t source)
+static int __init msm_timer_map(phys_addr_t addr, u32 event, u32 source,
+ u32 sts)
{
- event_base = ioremap(event, SZ_64);
- if (!event_base) {
- pr_err("Failed to map event base\n");
- return 1;
- }
- source_base = ioremap(source, SZ_64);
- if (!source_base) {
- pr_err("Failed to map source base\n");
- return 1;
+ void __iomem *base;
+
+ base = ioremap(addr, SZ_256);
+ if (!base) {
+ pr_err("Failed to map timer base\n");
+ return -ENOMEM;
}
+ event_base = base + event;
+ source_base = base + source;
+ if (sts)
+ sts_base = base + sts;
+
return 0;
}
@@ -315,7 +307,7 @@ void __init msm7x01_timer_init(void)
{
struct clocksource *cs = &msm_clocksource;
- if (msm_timer_map(0xc0100000, 0xc0100010))
+ if (msm_timer_map(0xc0100000, 0x0, 0x10, 0x0))
return;
cs->read = msm_read_timer_count_shift;
cs->mask = CLOCKSOURCE_MASK((32 - MSM_DGT_SHIFT));
@@ -326,14 +318,14 @@ void __init msm7x01_timer_init(void)
void __init msm7x30_timer_init(void)
{
- if (msm_timer_map(0xc0100004, 0xc0100024))
+ if (msm_timer_map(0xc0100000, 0x4, 0x24, 0x80))
return;
msm_timer_init(24576000 / 4, 32, 1, false);
}
void __init qsd8x50_timer_init(void)
{
- if (msm_timer_map(0xAC100000, 0xAC100010))
+ if (msm_timer_map(0xAC100000, 0x0, 0x10, 0x34))
return;
msm_timer_init(19200000 / 4, 32, 7, false);
}