[PATCH 8/9] ARM: Kirkwood: Add DT support for GPIO controllers
Rob Herring
robherring2 at gmail.com
Sun Jun 10 18:48:11 EDT 2012
On 06/10/2012 05:32 AM, Andrew Lunn wrote:
> The GPIO controllers can now be described in DT. Origionally GPIO
> controllers were instantiated during IRQ setup. The origional none-DT
> code has been split out, and is only called if no DT GPIO controllers
> are found.
>
> Signed-off-by: Andrew Lunn <andrew at lunn.ch>
> ---
> .../devicetree/bindings/gpio/mrvl-gpio.txt | 25 +++++++
> arch/arm/boot/dts/kirkwood.dtsi | 20 ++++++
> arch/arm/mach-kirkwood/irq.c | 20 ++++--
> arch/arm/plat-orion/gpio.c | 68 +++++++++++++++++++-
> arch/arm/plat-orion/include/plat/gpio.h | 2 +
> 5 files changed, 126 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/gpio/mrvl-gpio.txt b/Documentation/devicetree/bindings/gpio/mrvl-gpio.txt
> index 05428f3..d94ebc1 100644
> --- a/Documentation/devicetree/bindings/gpio/mrvl-gpio.txt
> +++ b/Documentation/devicetree/bindings/gpio/mrvl-gpio.txt
> @@ -27,3 +27,28 @@ Example:
> interrupt-controller;
> #interrupt-cells = <1>;
> };
> +
> +* Marvell Orion GPIO Controller
> +
> +Required properties:
> +- compatible : Should be "marvell,orion-gpio"
> +- reg : Address and length of the register set for controller.
> +- gpio-controller : So we know this is a gpio controller.
> +- gpio-base : Number of first gpio pin.
> +- ngpio : How many gpios this controller has.
> +- secondary-irq-base : IRQ number base
> +
> +Optional properties:
> +- mask-offset : For SMP Orions, offset for Nth CPU
> +
> +Example:
> +
> + gpio0: gpio at 10100 {
> + compatible = "marvell,orion-gpio";
> + #gpio-cells = <2>;
> + gpio-controller;
> + reg = <0x10100 0x40>;
> + gpio-base = <0>;
> + ngpio = <32>;
> + secondary-irq-base = <64>;
This and gpio-base are wrong. The DT should describe h/w and these are
Linux gpio and irq numbers. You need to create an irqdomain for the gpio
controller.
Rob
> + };
> diff --git a/arch/arm/boot/dts/kirkwood.dtsi b/arch/arm/boot/dts/kirkwood.dtsi
> index 3091c01..6de66dc 100644
> --- a/arch/arm/boot/dts/kirkwood.dtsi
> +++ b/arch/arm/boot/dts/kirkwood.dtsi
> @@ -18,6 +18,26 @@
> #address-cells = <1>;
> #size-cells = <1>;
>
> + gpio0: gpio at 10100 {
> + compatible = "marvell,orion-gpio";
> + #gpio-cells = <2>;
> + gpio-controller;
> + reg = <0x10100 0x40>;
> + gpio-base = <0>;
> + ngpio = <32>;
> + secondary-irq-base = <64>;
> + };
> +
> + gpio1: gpio at 10140 {
> + compatible = "marvell,orion-gpio";
> + #gpio-cells = <2>;
> + gpio-controller;
> + reg = <0x10140 0x40>;
> + gpio-base = <32>;
> + ngpio = <18>;
> + secondary-irq-base = <96>;
> + };
> +
> serial at 12000 {
> compatible = "ns16550a";
> reg = <0x12000 0x100>;
> diff --git a/arch/arm/mach-kirkwood/irq.c b/arch/arm/mach-kirkwood/irq.c
> index c4c68e5..81340c2 100644
> --- a/arch/arm/mach-kirkwood/irq.c
> +++ b/arch/arm/mach-kirkwood/irq.c
> @@ -24,25 +24,33 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
> orion_gpio_irq_handler((irq - IRQ_KIRKWOOD_GPIO_LOW_0_7) << 3);
> }
>
> -void __init kirkwood_init_irq(void)
> +static void __init kirkwood_init_gpio(void)
> {
> - orion_irq_init(0, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF));
> - orion_irq_init(32, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF));
> -
> /*
> * Initialize gpiolib for GPIOs 0-49.
> */
> orion_gpio_init(0, 32, GPIO_LOW_VIRT_BASE, 0,
> IRQ_KIRKWOOD_GPIO_START);
> + orion_gpio_init(32, 18, GPIO_HIGH_VIRT_BASE, 0,
> + IRQ_KIRKWOOD_GPIO_START + 32);
> +}
> +void __init kirkwood_init_irq(void)
> +{
> + orion_irq_init(0, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF));
> + orion_irq_init(32, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF));
> +
> irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_0_7, gpio_irq_handler);
> irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_8_15, gpio_irq_handler);
> irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_16_23, gpio_irq_handler);
> irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_24_31, gpio_irq_handler);
>
> - orion_gpio_init(32, 18, GPIO_HIGH_VIRT_BASE, 0,
> - IRQ_KIRKWOOD_GPIO_START + 32);
> irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_0_7, gpio_irq_handler);
> irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_8_15, gpio_irq_handler);
> irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_16_23,
> gpio_irq_handler);
> +
> + /* Try initializing the GPIO controllers via DT. If zero
> + controllers are found, fall back to hard coded values */
> + if (orion_gpio_init_dt() == 0)
> + kirkwood_init_gpio();
> }
> diff --git a/arch/arm/plat-orion/gpio.c b/arch/arm/plat-orion/gpio.c
> index af95af2..cc29367 100644
> --- a/arch/arm/plat-orion/gpio.c
> +++ b/arch/arm/plat-orion/gpio.c
> @@ -17,6 +17,9 @@
> #include <linux/io.h>
> #include <linux/gpio.h>
> #include <linux/leds.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <plat/gpio.h>
>
> /*
> * GPIO unit register offsets.
> @@ -401,8 +404,9 @@ static int gpio_irq_set_type(struct irq_data *d, u32 type)
> return 0;
> }
>
> -void __init orion_gpio_init(int gpio_base, int ngpio,
> - u32 base, int mask_offset, int secondary_irq_base)
> +void __init _orion_gpio_init(int gpio_base, int ngpio,
> + void __iomem *base, int mask_offset,
> + int secondary_irq_base, struct device_node *np)
> {
> struct orion_gpio_chip *ochip;
> struct irq_chip_generic *gc;
> @@ -426,8 +430,11 @@ void __init orion_gpio_init(int gpio_base, int ngpio,
> ochip->chip.base = gpio_base;
> ochip->chip.ngpio = ngpio;
> ochip->chip.can_sleep = 0;
> +#ifdef CONFIG_OF
> + ochip->chip.of_node = np;
> +#endif
> spin_lock_init(&ochip->lock);
> - ochip->base = (void __iomem *)base;
> + ochip->base = base;
> ochip->valid_input = 0;
> ochip->valid_output = 0;
> ochip->mask_offset = mask_offset;
> @@ -469,6 +476,15 @@ void __init orion_gpio_init(int gpio_base, int ngpio,
> IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
> }
>
> +/* None DT version */
> +void __init orion_gpio_init(int gpio_base, int ngpio,
> + u32 base, int mask_offset, int secondary_irq_base)
> +
> +{
> + _orion_gpio_init(gpio_base, ngpio, (void __iomem *)base,
> + mask_offset, secondary_irq_base, NULL);
> +}
> +
> void orion_gpio_irq_handler(int pinoff)
> {
> struct orion_gpio_chip *ochip;
> @@ -502,3 +518,49 @@ void orion_gpio_irq_handler(int pinoff)
> generic_handle_irq(irq);
> }
> }
> +
> +/* Configure all the gpio chips we can find. Return the number
> + * actually configured, so that we can fall back to the old way,
> + * for none-DT platforms.*/
> +#ifdef CONFIG_OF
> +int __init orion_gpio_init_dt(void)
> +{
> + int chips = 0;
> +
> + struct device_node *np = NULL;
> + int gpio_base, ngpio, mask_offset, secondary_irq_base;
> + void __iomem *base;
> + int ret;
> +
> + for_each_compatible_node(np, NULL, "marvell,orion-gpio") {
> + ret = of_property_read_u32(np, "gpio-base", &gpio_base);
> + if (ret)
> + continue;
> + ret = of_property_read_u32(np, "ngpio", &ngpio);
> + if (ret)
> + continue;
> + ret = of_property_read_u32(np, "mask-offset", &mask_offset);
> + if (ret == -EINVAL)
> + mask_offset = 0;
> + else
> + continue;
> + ret = of_property_read_u32(np, "secondary-irq-base",
> + &secondary_irq_base);
> + if (ret)
> + continue;
> + base = of_iomap(np, 0);
> + if (!base)
> + continue;
> +
> + _orion_gpio_init(gpio_base, ngpio, base, mask_offset,
> + secondary_irq_base, np);
> + chips++;
> + }
> + return chips;
> +}
> +#else
> +int __init orion_gpio_init_dt(void)
> +{
> + return 0;
> +}
> +#endif
> diff --git a/arch/arm/plat-orion/include/plat/gpio.h b/arch/arm/plat-orion/include/plat/gpio.h
> index bec0c98..68039de 100644
> --- a/arch/arm/plat-orion/include/plat/gpio.h
> +++ b/arch/arm/plat-orion/include/plat/gpio.h
> @@ -30,6 +30,8 @@ void orion_gpio_set_valid(unsigned pin, int mode);
> void __init orion_gpio_init(int gpio_base, int ngpio,
> u32 base, int mask_offset, int secondary_irq_base);
>
> +/* Initialize gpiolib using DT. */
> +int __init orion_gpio_init_dt(void);
> /*
> * GPIO interrupt handling.
> */
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