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>

1 files changed, 51 insertions, 59 deletions

diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c
index f9fd77e..284313f 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);
 }