Commit b56a7f92 authored by Olof Johansson's avatar Olof Johansson
Browse files

Merge tag 'msm-core-3.10' of... 

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: default avatarOlof Johansson <olof@lixom.net>
parents 56c5c13f e25e3d1f

Documentation/devicetree/bindings/arm/msm/timer.txt

+20 −21
Original line number Diff line number Diff line
@@ -3,36 +3,35 @@ 
Properties:



- compatible : Should at least contain "qcom,msm-timer". More specific

  properties such as "qcom,msm-gpt" and "qcom,msm-dgt" specify a general

  purpose timer and a debug timer respectively.

               properties specify which subsystem the timers are paired with.



- interrupts : Interrupt indicating a match event.

               "qcom,kpss-timer" - krait subsystem

               "qcom,scss-timer" - scorpion subsystem



- reg : Specifies the base address of the timer registers. The second region

  specifies an optional register used to configure the clock divider.

- interrupts : Interrupts for the the debug timer, the first general purpose

               timer, and optionally a second general purpose timer in that

               order.



- clock-frequency : The frequency of the timer in Hz.

- reg : Specifies the base address of the timer registers.



- clock-frequency : The frequency of the debug timer and the general purpose

                    timer(s) in Hz in that order.



Optional:



- cpu-offset : per-cpu offset used when the timer is accessed without the

  CPU remapping facilities. The offset is cpu-offset * cpu-nr.

               CPU remapping facilities. The offset is

               cpu-offset + (0x10000 * cpu-nr).



Example:



       timer@200a004 {

               compatible = "qcom,msm-gpt", "qcom,msm-timer";

               interrupts = <1 2 0x301>;

               reg = <0x0200a004 0x10>;

               clock-frequency = <32768>;

               cpu-offset = <0x40000>;

       };



       timer@200a024 {

               compatible = "qcom,msm-dgt", "qcom,msm-timer";

               interrupts = <1 3 0x301>;

               reg = <0x0200a024 0x10>,

                     <0x0200a034 0x4>;

               clock-frequency = <6750000>;

       timer@200a000 {

               compatible = "qcom,scss-timer", "qcom,msm-timer";

               interrupts = <1 1 0x301>,

                            <1 2 0x301>,

                            <1 3 0x301>;

               reg = <0x0200a000 0x100>;

               clock-frequency = <19200000>,

                                 <32768>;

               cpu-offset = <0x40000>;

       };

arch/arm/boot/dts/msm8660-surf.dts

+7 −13
Original line number Diff line number Diff line
@@ -16,19 +16,13 @@ 
	};



	timer@2000004 {

		compatible = "qcom,msm-gpt", "qcom,msm-timer";

		interrupts = <1 1 0x301>;

		reg = <0x02000004 0x10>;

		clock-frequency = <32768>;

		cpu-offset = <0x40000>;

	};



	timer@2000024 {

		compatible = "qcom,msm-dgt", "qcom,msm-timer";

		interrupts = <1 0 0x301>;

		reg = <0x02000024 0x10>,

		      <0x02000034 0x4>;

		clock-frequency = <6750000>;

		compatible = "qcom,scss-timer", "qcom,msm-timer";

		interrupts = <1 0 0x301>,

			     <1 1 0x301>,

			     <1 2 0x301>;

		reg = <0x02000000 0x100>;

		clock-frequency = <27000000>,

				  <32768>;

		cpu-offset = <0x40000>;

	};

arch/arm/boot/dts/msm8960-cdp.dts

+8 −14
Original line number Diff line number Diff line
@@ -15,20 +15,14 @@ 
		      < 0x02002000 0x1000 >;

	};



	timer@200a004 {

		compatible = "qcom,msm-gpt", "qcom,msm-timer";

		interrupts = <1 2 0x301>;

		reg = <0x0200a004 0x10>;

		clock-frequency = <32768>;

		cpu-offset = <0x80000>;

	};



	timer@200a024 {

		compatible = "qcom,msm-dgt", "qcom,msm-timer";

		interrupts = <1 1 0x301>;

		reg = <0x0200a024 0x10>,

		      <0x0200a034 0x4>;

		clock-frequency = <6750000>;

	timer@200a000 {

		compatible = "qcom,kpss-timer", "qcom,msm-timer";

		interrupts = <1 1 0x301>,

			     <1 2 0x301>,

			     <1 3 0x301>;

		reg = <0x0200a000 0x100>;

		clock-frequency = <27000000>,

				  <32768>;

		cpu-offset = <0x80000>;

	};

arch/arm/mach-msm/timer.c

+51 −59
Original line number Diff line number Diff line
@@ -36,13 +36,16 @@ 
#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);

}

CRA Git | Maintained and supported by SUSTech CRA and CCSE