diff options
| -rw-r--r-- | Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt | 68 | ||||
| -rw-r--r-- | arch/arm/mach-exynos/include/mach/irqs.h | 6 | ||||
| -rw-r--r-- | arch/arm/mach-exynos/mct.c | 49 |
3 files changed, 105 insertions, 18 deletions
diff --git a/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt b/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt new file mode 100644 index 000000000000..cb47bfbcaeea --- /dev/null +++ b/Documentation/devicetree/bindings/timer/samsung,exynos4210-mct.txt @@ -0,0 +1,68 @@ +Samsung's Multi Core Timer (MCT) + +The Samsung's Multi Core Timer (MCT) module includes two main blocks, the +global timer and CPU local timers. The global timer is a 64-bit free running +up-counter and can generate 4 interrupts when the counter reaches one of the +four preset counter values. The CPU local timers are 32-bit free running +down-counters and generate an interrupt when the counter expires. There is +one CPU local timer instantiated in MCT for every CPU in the system. + +Required properties: + +- compatible: should be "samsung,exynos4210-mct". + (a) "samsung,exynos4210-mct", for mct compatible with Exynos4210 mct. + (b) "samsung,exynos4412-mct", for mct compatible with Exynos4412 mct. + +- reg: base address of the mct controller and length of the address space + it occupies. + +- interrupts: the list of interrupts generated by the controller. The following + should be the order of the interrupts specified. The local timer interrupts + should be specified after the four global timer interrupts have been + specified. + + 0: Global Timer Interrupt 0 + 1: Global Timer Interrupt 1 + 2: Global Timer Interrupt 2 + 3: Global Timer Interrupt 3 + 4: Local Timer Interrupt 0 + 5: Local Timer Interrupt 1 + 6: .. + 7: .. + i: Local Timer Interrupt n + +Example 1: In this example, the system uses only the first global timer + interrupt generated by MCT and the remaining three global timer + interrupts are unused. Two local timer interrupts have been + specified. + + mct@10050000 { + compatible = "samsung,exynos4210-mct"; + reg = <0x10050000 0x800>; + interrupts = <0 57 0>, <0 0 0>, <0 0 0>, <0 0 0>, + <0 42 0>, <0 48 0>; + }; + +Example 2: In this example, the MCT global and local timer interrupts are + connected to two seperate interrupt controllers. Hence, an + interrupt-map is created to map the interrupts to the respective + interrupt controllers. + + mct@101C0000 { + compatible = "samsung,exynos4210-mct"; + reg = <0x101C0000 0x800>; + interrupt-controller; + #interrups-cells = <2>; + interrupt-parent = <&mct_map>; + interrupts = <0 0>, <1 0>, <2 0>, <3 0>, + <4 0>, <5 0>; + + mct_map: mct-map { + #interrupt-cells = <2>; + #address-cells = <0>; + #size-cells = <0>; + interrupt-map = <0x0 0 &combiner 23 3>, + <0x4 0 &gic 0 120 0>, + <0x5 0 &gic 0 121 0>; + }; + }; diff --git a/arch/arm/mach-exynos/include/mach/irqs.h b/arch/arm/mach-exynos/include/mach/irqs.h index 1f4dc35cd4b9..c0e75d8dd737 100644 --- a/arch/arm/mach-exynos/include/mach/irqs.h +++ b/arch/arm/mach-exynos/include/mach/irqs.h @@ -30,8 +30,6 @@ /* For EXYNOS4 and EXYNOS5 */ -#define EXYNOS_IRQ_MCT_LOCALTIMER IRQ_PPI(12) - #define EXYNOS_IRQ_EINT16_31 IRQ_SPI(32) /* For EXYNOS4 SoCs */ @@ -323,8 +321,6 @@ #define EXYNOS5_IRQ_CEC IRQ_SPI(114) #define EXYNOS5_IRQ_SATA IRQ_SPI(115) -#define EXYNOS5_IRQ_MCT_L0 IRQ_SPI(120) -#define EXYNOS5_IRQ_MCT_L1 IRQ_SPI(121) #define EXYNOS5_IRQ_MMC44 IRQ_SPI(123) #define EXYNOS5_IRQ_MDMA1 IRQ_SPI(124) #define EXYNOS5_IRQ_FIMC_LITE0 IRQ_SPI(125) @@ -419,8 +415,6 @@ #define EXYNOS5_IRQ_PMU_CPU1 COMBINER_IRQ(22, 4) #define EXYNOS5_IRQ_EINT0 COMBINER_IRQ(23, 0) -#define EXYNOS5_IRQ_MCT_G0 COMBINER_IRQ(23, 3) -#define EXYNOS5_IRQ_MCT_G1 COMBINER_IRQ(23, 4) #define EXYNOS5_IRQ_EINT1 COMBINER_IRQ(24, 0) #define EXYNOS5_IRQ_SYSMMU_LITE1_0 COMBINER_IRQ(24, 1) diff --git a/arch/arm/mach-exynos/mct.c b/arch/arm/mach-exynos/mct.c index 1061db4118aa..f34c933314f3 100644 --- a/arch/arm/mach-exynos/mct.c +++ b/arch/arm/mach-exynos/mct.c @@ -20,6 +20,8 @@ #include <linux/delay.h> #include <linux/percpu.h> #include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> #include <asm/arch_timer.h> #include <asm/localtimer.h> @@ -474,14 +476,16 @@ static struct local_timer_ops exynos4_mct_tick_ops __cpuinitdata = { }; #endif /* CONFIG_LOCAL_TIMERS */ -static void __init exynos4_timer_resources(void) +static void __init exynos4_timer_resources(struct device_node *np) { struct clk *mct_clk; mct_clk = clk_get(NULL, "xtal"); clk_rate = clk_get_rate(mct_clk); - reg_base = S5P_VA_SYSTIMER; + reg_base = np ? of_iomap(np, 0) : S5P_VA_SYSTIMER; + if (!reg_base) + panic("%s: unable to ioremap mct address space\n", __func__); #ifdef CONFIG_LOCAL_TIMERS if (mct_int_type == MCT_INT_PPI) { @@ -498,30 +502,51 @@ static void __init exynos4_timer_resources(void) #endif /* CONFIG_LOCAL_TIMERS */ } +static const struct of_device_id exynos_mct_ids[] = { + { .compatible = "samsung,exynos4210-mct", .data = (void *)MCT_INT_SPI }, + { .compatible = "samsung,exynos4412-mct", .data = (void *)MCT_INT_PPI }, +}; + void __init exynos4_timer_init(void) { + struct device_node *np = NULL; + const struct of_device_id *match; + u32 nr_irqs, i; + if (soc_is_exynos5440()) { arch_timer_of_register(); return; } - if (soc_is_exynos4210()) { +#ifdef CONFIG_OF + np = of_find_matching_node_and_match(NULL, exynos_mct_ids, &match); +#endif + if (np) { + mct_int_type = (u32)(match->data); + + /* This driver uses only one global timer interrupt */ + mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ); + + /* + * Find out the number of local irqs specified. The local + * timer irqs are specified after the four global timer + * irqs are specified. + */ +#ifdef CONFIG_OF + nr_irqs = of_irq_count(np); +#endif + for (i = MCT_L0_IRQ; i < nr_irqs; i++) + mct_irqs[i] = irq_of_parse_and_map(np, i); + } else if (soc_is_exynos4210()) { mct_irqs[MCT_G0_IRQ] = EXYNOS4_IRQ_MCT_G0; mct_irqs[MCT_L0_IRQ] = EXYNOS4_IRQ_MCT_L0; mct_irqs[MCT_L1_IRQ] = EXYNOS4_IRQ_MCT_L1; mct_int_type = MCT_INT_SPI; - } else if (soc_is_exynos5250()) { - mct_irqs[MCT_G0_IRQ] = EXYNOS5_IRQ_MCT_G0; - mct_irqs[MCT_L0_IRQ] = EXYNOS5_IRQ_MCT_L0; - mct_irqs[MCT_L1_IRQ] = EXYNOS5_IRQ_MCT_L1; - mct_int_type = MCT_INT_SPI; } else { - mct_irqs[MCT_G0_IRQ] = EXYNOS4_IRQ_MCT_G0; - mct_irqs[MCT_L0_IRQ] = EXYNOS_IRQ_MCT_LOCALTIMER; - mct_int_type = MCT_INT_PPI; + panic("unable to determine mct controller type\n"); } - exynos4_timer_resources(); + exynos4_timer_resources(np); exynos4_clocksource_init(); exynos4_clockevent_init(); } |