diff options
| -rw-r--r-- | Documentation/devicetree/bindings/watchdog/brcm,bcm2835-pm-wdog.txt | 13 | ||||
| -rw-r--r-- | arch/arm/Kconfig | 5 | ||||
| -rw-r--r-- | arch/arm/boot/dts/bcm2835-rpi-b.dts | 15 | ||||
| -rw-r--r-- | arch/arm/boot/dts/bcm2835.dtsi | 28 | ||||
| -rw-r--r-- | arch/arm/mach-bcm2835/bcm2835.c | 46 | ||||
| -rw-r--r-- | arch/arm/mach-bcm2835/include/mach/gpio.h | 1 |
6 files changed, 107 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/watchdog/brcm,bcm2835-pm-wdog.txt b/Documentation/devicetree/bindings/watchdog/brcm,bcm2835-pm-wdog.txt new file mode 100644 index 00000000000..d209366b4a6 --- /dev/null +++ b/Documentation/devicetree/bindings/watchdog/brcm,bcm2835-pm-wdog.txt @@ -0,0 +1,13 @@ +BCM2835 Watchdog timer + +Required properties: + +- compatible : should be "brcm,bcm2835-pm-wdt" +- reg : Specifies base physical address and size of the registers. + +Example: + +watchdog { + compatible = "brcm,bcm2835-pm-wdt"; + reg = <0x7e100000 0x28>; +}; diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 6c1d0198553..69d2844dd50 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -336,7 +336,7 @@ config ARCH_AT91 config ARCH_BCM2835 bool "Broadcom BCM2835 family" - select ARCH_WANT_OPTIONAL_GPIOLIB + select ARCH_REQUIRE_GPIOLIB select ARM_AMBA select ARM_ERRATA_411920 select ARM_TIMER_SP804 @@ -344,7 +344,10 @@ config ARCH_BCM2835 select COMMON_CLK select CPU_V6 select GENERIC_CLOCKEVENTS + select GENERIC_GPIO select MULTI_IRQ_HANDLER + select PINCTRL + select PINCTRL_BCM2835 select SPARSE_IRQ select USE_OF help diff --git a/arch/arm/boot/dts/bcm2835-rpi-b.dts b/arch/arm/boot/dts/bcm2835-rpi-b.dts index 7dd860f83f9..9b72054a0bc 100644 --- a/arch/arm/boot/dts/bcm2835-rpi-b.dts +++ b/arch/arm/boot/dts/bcm2835-rpi-b.dts @@ -10,3 +10,18 @@ reg = <0 0x10000000>; }; }; + +&gpio { + pinctrl-names = "default"; + pinctrl-0 = <&alt0 &alt3>; + + alt0: alt0 { + brcm,pins = <0 1 2 3 4 5 6 7 8 9 10 11 14 15 40 45>; + brcm,function = <4>; /* alt0 */ + }; + + alt3: alt3 { + brcm,pins = <48 49 50 51 52 53>; + brcm,function = <7>; /* alt3 */ + }; +}; diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi index 0b619398532..8917550fd1b 100644 --- a/arch/arm/boot/dts/bcm2835.dtsi +++ b/arch/arm/boot/dts/bcm2835.dtsi @@ -29,11 +29,39 @@ #interrupt-cells = <2>; }; + watchdog { + compatible = "brcm,bcm2835-pm-wdt"; + reg = <0x7e100000 0x28>; + }; + uart@20201000 { compatible = "brcm,bcm2835-pl011", "arm,pl011", "arm,primecell"; reg = <0x7e201000 0x1000>; interrupts = <2 25>; clock-frequency = <3000000>; }; + + gpio: gpio { + compatible = "brcm,bcm2835-gpio"; + reg = <0x7e200000 0xb4>; + /* + * The GPIO IP block is designed for 3 banks of GPIOs. + * Each bank has a GPIO interrupt for itself. + * There is an overall "any bank" interrupt. + * In order, these are GIC interrupts 17, 18, 19, 20. + * Since the BCM2835 only has 2 banks, the 2nd bank + * interrupt output appears to be mirrored onto the + * 3rd bank's interrupt signal. + * So, a bank0 interrupt shows up on 17, 20, and + * a bank1 interrupt shows up on 18, 19, 20! + */ + interrupts = <2 17>, <2 18>, <2 19>, <2 20>; + + gpio-controller; + #gpio-cells = <2>; + + interrupt-controller; + #interrupt-cells = <2>; + }; }; }; diff --git a/arch/arm/mach-bcm2835/bcm2835.c b/arch/arm/mach-bcm2835/bcm2835.c index f6fea493357..c4dd210f4db 100644 --- a/arch/arm/mach-bcm2835/bcm2835.c +++ b/arch/arm/mach-bcm2835/bcm2835.c @@ -12,8 +12,10 @@ * GNU General Public License for more details. */ +#include <linux/delay.h> #include <linux/init.h> #include <linux/irqchip/bcm2835.h> +#include <linux/of_address.h> #include <linux/of_platform.h> #include <linux/bcm2835_timer.h> #include <linux/clk/bcm2835.h> @@ -23,6 +25,48 @@ #include <mach/bcm2835_soc.h> +#define PM_RSTC 0x1c +#define PM_WDOG 0x24 + +#define PM_PASSWORD 0x5a000000 +#define PM_RSTC_WRCFG_MASK 0x00000030 +#define PM_RSTC_WRCFG_FULL_RESET 0x00000020 + +static void __iomem *wdt_regs; + +/* + * The machine restart method can be called from an atomic context so we won't + * be able to ioremap the regs then. + */ +static void bcm2835_setup_restart(void) +{ + struct device_node *np = of_find_compatible_node(NULL, NULL, + "brcm,bcm2835-pm-wdt"); + if (WARN(!np, "unable to setup watchdog restart")) + return; + + wdt_regs = of_iomap(np, 0); + WARN(!wdt_regs, "failed to remap watchdog regs"); +} + +static void bcm2835_restart(char mode, const char *cmd) +{ + u32 val; + + if (!wdt_regs) + return; + + /* use a timeout of 10 ticks (~150us) */ + writel_relaxed(10 | PM_PASSWORD, wdt_regs + PM_WDOG); + val = readl_relaxed(wdt_regs + PM_RSTC); + val &= ~PM_RSTC_WRCFG_MASK; + val |= PM_PASSWORD | PM_RSTC_WRCFG_FULL_RESET; + writel_relaxed(val, wdt_regs + PM_RSTC); + + /* No sleeping, possibly atomic. */ + mdelay(1); +} + static struct map_desc io_map __initdata = { .virtual = BCM2835_PERIPH_VIRT, .pfn = __phys_to_pfn(BCM2835_PERIPH_PHYS), @@ -39,6 +83,7 @@ void __init bcm2835_init(void) { int ret; + bcm2835_setup_restart(); bcm2835_init_clocks(); ret = of_platform_populate(NULL, of_default_bus_match_table, NULL, @@ -60,5 +105,6 @@ DT_MACHINE_START(BCM2835, "BCM2835") .handle_irq = bcm2835_handle_irq, .init_machine = bcm2835_init, .timer = &bcm2835_timer, + .restart = bcm2835_restart, .dt_compat = bcm2835_compat MACHINE_END diff --git a/arch/arm/mach-bcm2835/include/mach/gpio.h b/arch/arm/mach-bcm2835/include/mach/gpio.h new file mode 100644 index 00000000000..40a8c178f10 --- /dev/null +++ b/arch/arm/mach-bcm2835/include/mach/gpio.h @@ -0,0 +1 @@ +/* empty */ |