[PATCH 15/29] ARM: orion5x: switch to DT interrupts and timer

[Sebastian Hesselbarth]

On 04/13/2014 04:39 PM, Thomas Petazzoni wrote:
> This commit switches the Orion5x platforms described through DT to use
> a DT-defined interrupt controller and timer.
>
> This involves:
>
>   * Describing in the DT the bridge interrupt controller, which is a
>     child interrupt controller to the main one, which is used for timer
>     and watchdog interrupts.
>
>   * Describing in the DT the timer.
>
>   * Adding in the DT the interrupt specifications for the watchdog.
>
>   * Selecting the ORION_IRQCHIP and ORION_TIMER drivers to be compiled.
>
>   * Change the timer initialization in board-dt.c to use
>     clocksource_of_init().
>
>   * Implement a multi-IRQ handler for non-DT platforms in
>     mach-orion5x/irq.c.
>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
> ---
>   arch/arm/boot/dts/orion5x.dtsi   | 19 +++++++++++++++++++
>   arch/arm/mach-orion5x/Kconfig    |  2 ++
>   arch/arm/mach-orion5x/board-dt.c | 10 ++--------
>   arch/arm/mach-orion5x/irq.c      | 28 ++++++++++++++++++++++++++++
>   4 files changed, 51 insertions(+), 8 deletions(-)
>
> diff --git a/arch/arm/boot/dts/orion5x.dtsi b/arch/arm/boot/dts/orion5x.dtsi
> index ac2ec8f..f25ed91 100644
> --- a/arch/arm/boot/dts/orion5x.dtsi
> +++ b/arch/arm/boot/dts/orion5x.dtsi
> @@ -78,6 +78,15 @@
>   				status = "disabled";
>   			};
>
> +			bridge_intc: bridge-interrupt-ctrl at 20110 {
> +				compatible = "marvell,orion-bridge-intc";
> +				interrupt-controller;
> +				#interrupt-cells = <1>;
> +				reg = <0x20110 0x8>;
> +				interrupts = <0>;
> +				marvell,#interrupts = <4>;
> +			};
> +
>   			intc: interrupt-controller at 20200 {
>   				compatible = "marvell,orion-intc";
>   				interrupt-controller;
> @@ -85,9 +94,19 @@
>   				reg = <0x20200 0x08>;
>   			};
>
> +			timer at 20300 {
> +				compatible = "marvell,orion-timer";
> +				reg = <0x20300 0x20>;
> +				interrupt-parent = <&bridge_intc>;
> +				interrupts = <1>, <2>;
> +				clocks = <&core_clk 0>;
> +			};
> +
>   			wdt at 20300 {
>   				compatible = "marvell,orion-wdt";
>   				reg = <0x20300 0x28>;
> +				interrupt-parent = <&bridge_intc>;
> +				interrupts = <3>;
>   				status = "okay";
>   			};
>
> diff --git a/arch/arm/mach-orion5x/Kconfig b/arch/arm/mach-orion5x/Kconfig
> index 4f51132..bd65872 100644
> --- a/arch/arm/mach-orion5x/Kconfig
> +++ b/arch/arm/mach-orion5x/Kconfig
> @@ -6,6 +6,8 @@ config ARCH_ORION5X_DT
>   	bool "Marvell Orion5x Flattened Device Tree"
>   	select USE_OF
>   	select ORION_CLK
> +	select ORION_IRQCHIP
> +	select ORION_TIMER
>   	help
>   	  Say 'Y' here if you want your kernel to support the
>   	  Marvell Orion5x using flattened device tree.
> diff --git a/arch/arm/mach-orion5x/board-dt.c b/arch/arm/mach-orion5x/board-dt.c
> index c489661..38b54f1 100644
> --- a/arch/arm/mach-orion5x/board-dt.c
> +++ b/arch/arm/mach-orion5x/board-dt.c
> @@ -17,6 +17,7 @@
>   #include <linux/cpu.h>
>   #include <linux/mbus.h>
>   #include <linux/clk-provider.h>
> +#include <linux/clocksource.h>
>   #include <asm/system_misc.h>
>   #include <asm/mach/arch.h>
>   #include <asm/mach/map.h>
> @@ -36,15 +37,10 @@ static struct of_dev_auxdata orion5x_auxdata_lookup[] __initdata = {
>   	{},
>   };
>
> -static void orion5x_dt_init_early(void)
> -{
> -	orion_time_set_base(TIMER_VIRT_BASE);
> -}
> -
>   static void orion5x_dt_init_time(void)
>   {
> -	orion5x_timer_init();
>   	of_clk_init(NULL);
> +	clocksource_of_init();
>   	BUG_ON(mvebu_mbus_dt_init());

If you move the mvebu_mbus_dt_init() to .init_machine callback, you
can also drop .init_time callback.

Sebastian

>   }
>
> @@ -85,8 +81,6 @@ static const char *orion5x_dt_compat[] = {
>   DT_MACHINE_START(ORION5X_DT, "Marvell Orion5x (Flattened Device Tree)")
>   	/* Maintainer: Thomas Petazzoni <thomas.petazzoni at free-electrons.com> */
>   	.map_io		= orion5x_map_io,
> -	.init_early	= orion5x_dt_init_early,
> -	.init_irq	= orion_dt_init_irq,
>   	.init_time	= orion5x_dt_init_time,
>   	.init_machine	= orion5x_dt_init,
>   	.restart	= orion5x_restart,
> diff --git a/arch/arm/mach-orion5x/irq.c b/arch/arm/mach-orion5x/irq.c
> index 9654b0c..cd4bac4 100644
> --- a/arch/arm/mach-orion5x/irq.c
> +++ b/arch/arm/mach-orion5x/irq.c
> @@ -16,6 +16,7 @@
>   #include <mach/bridge-regs.h>
>   #include <plat/orion-gpio.h>
>   #include <plat/irq.h>
> +#include <asm/exception.h>
>   #include "common.h"
>
>   static int __initdata gpio0_irqs[4] = {
> @@ -25,10 +26,37 @@ static int __initdata gpio0_irqs[4] = {
>   	IRQ_ORION5X_GPIO_24_31,
>   };
>
> +#ifdef CONFIG_MULTI_IRQ_HANDLER
> +/*
> + * Compiling with both non-DT and DT support enabled, will
> + * break asm irq handler used by non-DT boards. Therefore,
> + * we provide a C-style irq handler even for non-DT boards,
> + * if MULTI_IRQ_HANDLER is set.
> + */
> +
> +asmlinkage void
> +__exception_irq_entry orion5x_legacy_handle_irq(struct pt_regs *regs)
> +{
> +	u32 stat;
> +
> +	stat = readl_relaxed(MAIN_IRQ_CAUSE);
> +	stat &= readl_relaxed(MAIN_IRQ_MASK);
> +	if (stat) {
> +		unsigned int hwirq = __fls(stat);
> +		handle_IRQ(hwirq, regs);
> +		return;
> +	}
> +}
> +#endif
> +
>   void __init orion5x_init_irq(void)
>   {
>   	orion_irq_init(0, MAIN_IRQ_MASK);
>
> +#ifdef CONFIG_MULTI_IRQ_HANDLER
> +	set_handle_irq(orion5x_legacy_handle_irq);
> +#endif
> +
>   	/*
>   	 * Initialize gpiolib for GPIOs 0-31.
>   	 */
>