diff options
| -rw-r--r-- | Documentation/devicetree/bindings/arm/atmel-at91.txt | 8 | ||||
| -rw-r--r-- | arch/arm/boot/dts/at91sam9g20.dtsi | 6 | ||||
| -rw-r--r-- | arch/arm/boot/dts/at91sam9g45.dtsi | 6 | ||||
| -rw-r--r-- | arch/arm/mach-at91/at91sam926x_time.c | 63 | ||||
| -rw-r--r-- | arch/arm/mach-at91/at91sam9x5.c | 2 |
5 files changed, 81 insertions, 4 deletions
diff --git a/Documentation/devicetree/bindings/arm/atmel-at91.txt b/Documentation/devicetree/bindings/arm/atmel-at91.txt new file mode 100644 index 000000000000..380f711a2021 --- /dev/null +++ b/Documentation/devicetree/bindings/arm/atmel-at91.txt @@ -0,0 +1,8 @@ +Atmel AT91 device tree bindings. +================================ + +PIT Timer required properties: +- compatible: Should be "atmel,at91sam9260-pit" +- reg: Should contain registers location and length +- interrupts: Should contain interrupt for the PIT which is the IRQ line + shared across all System Controller members. diff --git a/arch/arm/boot/dts/at91sam9g20.dtsi b/arch/arm/boot/dts/at91sam9g20.dtsi index 325989a27a7a..04c56c41001f 100644 --- a/arch/arm/boot/dts/at91sam9g20.dtsi +++ b/arch/arm/boot/dts/at91sam9g20.dtsi @@ -57,6 +57,12 @@ reg = <0xfffff000 0x200>; }; + pit: timer@fffffd30 { + compatible = "atmel,at91sam9260-pit"; + reg = <0xfffffd30 0xf>; + interrupts = <1 4>; + }; + pioA: gpio@fffff400 { compatible = "atmel,at91rm9200-gpio"; reg = <0xfffff400 0x100>; diff --git a/arch/arm/boot/dts/at91sam9g45.dtsi b/arch/arm/boot/dts/at91sam9g45.dtsi index a9dbbb5b86f5..3881cab965fa 100644 --- a/arch/arm/boot/dts/at91sam9g45.dtsi +++ b/arch/arm/boot/dts/at91sam9g45.dtsi @@ -58,6 +58,12 @@ reg = <0xfffff000 0x200>; }; + pit: timer@fffffd30 { + compatible = "atmel,at91sam9260-pit"; + reg = <0xfffffd30 0xf>; + interrupts = <1 4>; + }; + dma: dma-controller@ffffec00 { compatible = "atmel,at91sam9g45-dma"; reg = <0xffffec00 0x200>; diff --git a/arch/arm/mach-at91/at91sam926x_time.c b/arch/arm/mach-at91/at91sam926x_time.c index d89ead740a99..5d71476a2832 100644 --- a/arch/arm/mach-at91/at91sam926x_time.c +++ b/arch/arm/mach-at91/at91sam926x_time.c @@ -14,6 +14,9 @@ #include <linux/kernel.h> #include <linux/clk.h> #include <linux/clockchips.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> #include <asm/mach/time.h> @@ -133,7 +136,8 @@ static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id) static struct irqaction at91sam926x_pit_irq = { .name = "at91_tick", .flags = IRQF_SHARED | IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, - .handler = at91sam926x_pit_interrupt + .handler = at91sam926x_pit_interrupt, + .irq = AT91_ID_SYS, }; static void at91sam926x_pit_reset(void) @@ -149,6 +153,49 @@ static void at91sam926x_pit_reset(void) pit_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN); } +#ifdef CONFIG_OF +static struct of_device_id pit_timer_ids[] = { + { .compatible = "atmel,at91sam9260-pit" }, + { /* sentinel */ } +}; + +static int __init of_at91sam926x_pit_init(void) +{ + struct device_node *np; + int ret; + + np = of_find_matching_node(NULL, pit_timer_ids); + if (!np) + goto err; + + pit_base_addr = of_iomap(np, 0); + if (!pit_base_addr) + goto node_err; + + /* Get the interrupts property */ + ret = irq_of_parse_and_map(np, 0); + if (!ret) + goto ioremap_err; + at91sam926x_pit_irq.irq = ret; + + of_node_put(np); + + return 0; + +ioremap_err: + iounmap(pit_base_addr); +node_err: + of_node_put(np); +err: + return -EINVAL; +} +#else +static int __init of_at91sam926x_pit_init(void) +{ + return -EINVAL; +} +#endif + /* * Set up both clocksource and clockevent support. */ @@ -157,6 +204,9 @@ static void __init at91sam926x_pit_init(void) unsigned long pit_rate; unsigned bits; + /* For device tree enabled device: initialize here */ + of_at91sam926x_pit_init(); + /* * Use our actual MCK to figure out how many MCK/16 ticks per * 1/HZ period (instead of a compile-time constant LATCH). @@ -177,7 +227,7 @@ static void __init at91sam926x_pit_init(void) clocksource_register_hz(&pit_clk, pit_rate); /* Set up irq handler */ - setup_irq(AT91_ID_SYS, &at91sam926x_pit_irq); + setup_irq(at91sam926x_pit_irq.irq, &at91sam926x_pit_irq); /* Set up and register clockevents */ pit_clkevt.mult = div_sc(pit_rate, NSEC_PER_SEC, pit_clkevt.shift); @@ -193,6 +243,15 @@ static void at91sam926x_pit_suspend(void) void __init at91sam926x_ioremap_pit(u32 addr) { +#if defined(CONFIG_OF) + struct device_node *np = + of_find_matching_node(NULL, pit_timer_ids); + + if (np) { + of_node_put(np); + return; + } +#endif pit_base_addr = ioremap(addr, 16); if (!pit_base_addr) diff --git a/arch/arm/mach-at91/at91sam9x5.c b/arch/arm/mach-at91/at91sam9x5.c index d17d4262665b..a34d96afa746 100644 --- a/arch/arm/mach-at91/at91sam9x5.c +++ b/arch/arm/mach-at91/at91sam9x5.c @@ -301,8 +301,6 @@ static void __init at91sam9x5_map_io(void) static void __init at91sam9x5_ioremap_registers(void) { - if (of_at91sam926x_pit_init() < 0) - panic("Impossible to find PIT\n"); at91_ioremap_ramc(0, AT91SAM9X5_BASE_DDRSDRC0, 512); } |