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Commit d5f73cd6 authored by Olof Johansson's avatar Olof Johansson
Browse files

Merge tag 'devel-dt-arch-timer-for-v3.7' of... 

Merge tag 'devel-dt-arch-timer-for-v3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into next/dt

From Tony Lindgren:

Few late patches to enable arch timer for omap5
using device tree.

* tag 'devel-dt-arch-timer-for-v3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
  ARM: OMAP5: Enable arch timer support
  ARM: OMAP: Add initialisation for the real-time counter.
parents 4b1ebb64 ef8fe6fe

arch/arm/boot/dts/omap5.dtsi

+12 −0
Original line number Original line Diff line number Diff line
@@ -33,9 +33,21 @@ 
	cpus {

	cpus {

		cpu@0 {

		cpu@0 {

			compatible = "arm,cortex-a15";

			compatible = "arm,cortex-a15";

			timer {

				compatible = "arm,armv7-timer";

				/* 14th PPI IRQ, active low level-sensitive */

				interrupts = <1 14 0x308>;

				clock-frequency = <6144000>;

			};

		};

		};

		cpu@1 {

		cpu@1 {

			compatible = "arm,cortex-a15";

			compatible = "arm,cortex-a15";

			timer {

				compatible = "arm,armv7-timer";

				/* 14th PPI IRQ, active low level-sensitive */

				interrupts = <1 14 0x308>;

				clock-frequency = <6144000>;

			};

		};

		};

	};

	};

arch/arm/mach-omap2/Kconfig

+5 −0
Original line number Original line Diff line number Diff line
@@ -25,6 +25,9 @@ config ARCH_OMAP2PLUS_TYPICAL 
config SOC_HAS_OMAP2_SDRC

config SOC_HAS_OMAP2_SDRC

	bool "OMAP2 SDRAM Controller support"

	bool "OMAP2 SDRAM Controller support"





config SOC_HAS_REALTIME_COUNTER

	bool "Real time free running counter"



config ARCH_OMAP2

config ARCH_OMAP2

	bool "TI OMAP2"

	bool "TI OMAP2"

	depends on ARCH_OMAP2PLUS

	depends on ARCH_OMAP2PLUS
@@ -71,6 +74,8 @@ config SOC_OMAP5 
	select ARM_GIC

	select ARM_GIC

	select HAVE_SMP

	select HAVE_SMP

	select ARM_CPU_SUSPEND if PM

	select ARM_CPU_SUSPEND if PM

	select SOC_HAS_REALTIME_COUNTER

	select ARM_ARCH_TIMER





comment "OMAP Core Type"

comment "OMAP Core Type"

	depends on ARCH_OMAP2

	depends on ARCH_OMAP2

arch/arm/mach-omap2/timer.c

+96 −1
Original line number Original line Diff line number Diff line
@@ -42,6 +42,7 @@ 
#include <asm/smp_twd.h>

#include <asm/smp_twd.h>

#include <asm/sched_clock.h>

#include <asm/sched_clock.h>





#include <asm/arch_timer.h>

#include <plat/omap_hwmod.h>

#include <plat/omap_hwmod.h>

#include <plat/omap_device.h>

#include <plat/omap_device.h>

#include <plat/dmtimer.h>

#include <plat/dmtimer.h>
@@ -72,6 +73,11 @@ 
#define OMAP3_SECURE_TIMER	1

#define OMAP3_SECURE_TIMER	1

#endif

#endif





#define REALTIME_COUNTER_BASE				0x48243200

#define INCREMENTER_NUMERATOR_OFFSET			0x10

#define INCREMENTER_DENUMERATOR_RELOAD_OFFSET		0x14

#define NUMERATOR_DENUMERATOR_MASK			0xfffff000



/* Clockevent code */

/* Clockevent code */





static struct omap_dm_timer clkev;

static struct omap_dm_timer clkev;
@@ -349,6 +355,84 @@ static void __init omap2_clocksource_init(int gptimer_id, 
		omap2_gptimer_clocksource_init(gptimer_id, fck_source);

		omap2_gptimer_clocksource_init(gptimer_id, fck_source);

}

}





#ifdef CONFIG_SOC_HAS_REALTIME_COUNTER

/*

 * The realtime counter also called master counter, is a free-running

 * counter, which is related to real time. It produces the count used

 * by the CPU local timer peripherals in the MPU cluster. The timer counts

 * at a rate of 6.144 MHz. Because the device operates on different clocks

 * in different power modes, the master counter shifts operation between

 * clocks, adjusting the increment per clock in hardware accordingly to

 * maintain a constant count rate.

 */

static void __init realtime_counter_init(void)

{

	void __iomem *base;

	static struct clk *sys_clk;

	unsigned long rate;

	unsigned int reg, num, den;



	base = ioremap(REALTIME_COUNTER_BASE, SZ_32);

	if (!base) {

		pr_err("%s: ioremap failed\n", __func__);

		return;

	}

	sys_clk = clk_get(NULL, "sys_clkin_ck");

	if (!sys_clk) {

		pr_err("%s: failed to get system clock handle\n", __func__);

		iounmap(base);

		return;

	}



	rate = clk_get_rate(sys_clk);

	/* Numerator/denumerator values refer TRM Realtime Counter section */

	switch (rate) {

	case 1200000:

		num = 64;

		den = 125;

		break;

	case 1300000:

		num = 768;

		den = 1625;

		break;

	case 19200000:

		num = 8;

		den = 25;

		break;

	case 2600000:

		num = 384;

		den = 1625;

		break;

	case 2700000:

		num = 256;

		den = 1125;

		break;

	case 38400000:

	default:

		/* Program it for 38.4 MHz */

		num = 4;

		den = 25;

		break;

	}



	/* Program numerator and denumerator registers */

	reg = __raw_readl(base + INCREMENTER_NUMERATOR_OFFSET) &

			NUMERATOR_DENUMERATOR_MASK;

	reg |= num;

	__raw_writel(reg, base + INCREMENTER_NUMERATOR_OFFSET);



	reg = __raw_readl(base + INCREMENTER_NUMERATOR_OFFSET) &

			NUMERATOR_DENUMERATOR_MASK;

	reg |= den;

	__raw_writel(reg, base + INCREMENTER_DENUMERATOR_RELOAD_OFFSET);



	iounmap(base);

}

#else

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,			\

				clksrc_nr, clksrc_src)			\

				clksrc_nr, clksrc_src)			\

static void __init omap##name##_timer_init(void)			\

static void __init omap##name##_timer_init(void)			\
@@ -410,7 +494,18 @@ OMAP_SYS_TIMER(4) 
#endif

#endif





#ifdef CONFIG_SOC_OMAP5

#ifdef CONFIG_SOC_OMAP5

OMAP_SYS_TIMER_INIT(5, 1, OMAP4_CLKEV_SOURCE, 2, OMAP4_MPU_SOURCE)

static void __init omap5_timer_init(void)

{

	int err;



	omap2_gp_clockevent_init(1, OMAP4_CLKEV_SOURCE);

	omap2_clocksource_init(2, OMAP4_MPU_SOURCE);

	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)

OMAP_SYS_TIMER(5)

#endif

#endif