kirkwood devicetree respin
Grant Likely
grant.likely at secretlab.ca
Sat Apr 7 09:20:12 EST 2012
On Tue, 13 Mar 2012 15:57:49 +0000, Arnd Bergmann <arnd at arndb.de> wrote:
> On Monday 12 March 2012, Jason Cooper wrote:
> > I haven't had a chance to push this series to the ml yet (maybe
> > tonight), but I wanted to give Jamie something better to go off of.
> >
> > Only issue I have (I think unrelated) is that orion-ehci isn't coming
> > up. But these patches don't touch that, so I think it might be my
> > config again. Although it doesn't look like it...
>
> I looked at your patches but also couldn't find anything that hints
> at why ehci would break.
>
> > Also, serial comes up, works without earlyprintk, but says irq = 0.
> > Could be due to the way I setup serial in dtsi/dts.
>
> Well, in this series you don't have any interrupt-controller node
> in the device tree, so the interrupt number lookup fails for
> any irq you put into the device tree.
>
> I wanted to understand how this works for myself, so I've tried
> implementing it in the patch below. This probably doesn't work
> right away, but it should give you an idea of what needs to
> be done.
>
> It is based on the latest irqdomain series from
> git://git.secretlab.ca/git/linux-2.6.git irqdomain/next
> together with your own patches.
>
> Grant, can you have a look at this? I'm trying to help out
> multiple people right now who are converting a number of platforms
> to devicetree. It would be good to know if I'm giving the right
> recommendations.
>
> Signed-off-by: Arnd Bergmann <arnd at arndb.de>
>
> diff --git a/arch/arm/boot/dts/kirkwood.dtsi b/arch/arm/boot/dts/kirkwood.dtsi
> index 3474ef8..762f8e2 100644
> --- a/arch/arm/boot/dts/kirkwood.dtsi
> +++ b/arch/arm/boot/dts/kirkwood.dtsi
> @@ -2,6 +2,7 @@
>
> / {
> compatible = "mrvl,kirkwood";
> + interrupt-parent = <&irq>;
>
> ocp at f1000000 {
> compatible = "simple-bus";
> @@ -9,6 +10,22 @@
> #address-cells = <1>;
> #size-cells = <1>;
>
> + irq: irq at f1020204 {
> + compatible = "mrvl,kirkwood-irq", "mrvl,orion-irq";
> + interrupt-controller;
> + #interrupt-cells = <1>;
> + reg = <0x20204 0x4 0x14>;
> + };
> +
> + gpio: gpio at f1010100 {
> + compatible = "mrvl,kirkwood-gpio", "mrvl,orion-gpio";
> + gpio-controller;
> + interrupt-controller;
> + #interrupt-cells = <1>;
> + #gpio-cells = <1>;
> + reg = <0x10100 0x40 0x10140 0x40>;
> + };
> +
> serial at 12000 {
> compatible = "ns16550a";
> reg = <0x12000 0x100>;
> diff --git a/arch/arm/mach-kirkwood/board-dt.c b/arch/arm/mach-kirkwood/board-dt.c
> index 0819240..67a356c 100644
> --- a/arch/arm/mach-kirkwood/board-dt.c
> +++ b/arch/arm/mach-kirkwood/board-dt.c
> @@ -16,6 +16,7 @@
> #include <linux/of_platform.h>
> #include <asm/mach/arch.h>
> #include <asm/mach/map.h>
> +#include <plat/irq.h>
> #include <mach/bridge-regs.h>
> #include "common.h"
>
> @@ -67,7 +68,7 @@ DT_MACHINE_START(KIRKWOOD_DT, "Marvell Kirkwood (Flattened Device Tree)")
> /* Maintainer: Jason Cooper <jason at lakedaemon.net> */
> .map_io = kirkwood_map_io,
> .init_early = kirkwood_init_early,
> - .init_irq = kirkwood_init_irq,
> + .init_irq = orion_dt_init_irq,
> .timer = &kirkwood_timer,
> .init_machine = kirkwood_dt_init,
> .restart = kirkwood_restart,
> diff --git a/arch/arm/mach-kirkwood/irq.c b/arch/arm/mach-kirkwood/irq.c
> index c4c68e5..a0e13d2 100644
> --- a/arch/arm/mach-kirkwood/irq.c
> +++ b/arch/arm/mach-kirkwood/irq.c
> @@ -46,3 +46,4 @@ void __init kirkwood_init_irq(void)
> irq_set_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_16_23,
> gpio_irq_handler);
> }
> +
> diff --git a/arch/arm/plat-orion/include/plat/irq.h b/arch/arm/plat-orion/include/plat/irq.h
> index f05eeab..dc83270 100644
> --- a/arch/arm/plat-orion/include/plat/irq.h
> +++ b/arch/arm/plat-orion/include/plat/irq.h
> @@ -13,5 +13,6 @@
>
> void orion_irq_init(unsigned int irq_start, void __iomem *maskaddr);
>
> +void orion_dt_init_irq(void);
>
> #endif
> diff --git a/arch/arm/plat-orion/irq.c b/arch/arm/plat-orion/irq.c
> index 2d5b9c1..2e8e5db 100644
> --- a/arch/arm/plat-orion/irq.c
> +++ b/arch/arm/plat-orion/irq.c
> @@ -12,7 +12,12 @@
> #include <linux/init.h>
> #include <linux/irq.h>
> #include <linux/io.h>
> +#include <linux/irqdomain.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +
> #include <plat/irq.h>
> +#include <plat/gpio.h>
>
> void __init orion_irq_init(unsigned int irq_start, void __iomem *maskaddr)
> {
> @@ -32,3 +37,67 @@ void __init orion_irq_init(unsigned int irq_start, void __iomem *maskaddr)
> irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_MASK_CACHE,
> IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
> }
> +
> +#ifdef CONFIG_OF
> +static int __init orion_dt_irq_setup(struct device_node *node, struct device_node *parent)
> +{
> + int i;
> + void __iomem *reg;
> +
> + for (i = 0; (reg = of_iomap(node, i)) != NULL; i++) {
> + orion_irq_init(i * 32, reg);
> + irq_domain_add_legacy(node, 32, i * 32, 0,
> + &irq_domain_simple_ops, NULL);
I'm rather late to this dicussion, and it appears that things have
progressed since you posted this initial patch, but I wanted to
comment on this.
I really don't want the irq_domain registration code separated from
the irq_driver itself. That was done for some of the early DT irq
support code, but that was very much a temporary measure until the
support logic is in place.
What should be done instead is the irq controller driver should be
converted to always use an irq_domain (DT and non-DT).
> + }
> +
> + return 0;
> +}
> +
> +static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
> +{
> + orion_gpio_irq_handler((long)irq_data_get_irq_handler_data(&desc->irq_data));
> +}
> +
> +unsigned int irq_orion_gpio_start = 64; /* can be overridden from platform */
> +static int __init orion_dt_gpio_irq_setup(struct device_node *node, struct device_node *parent)
> +{
> + int i;
> + void __iomem *reg;
> + for (i = 0; (reg = of_iomap(node, i)) != NULL; i++) {
> + int nr_irqs;
> +
> + for (nr_irqs = 0; nr_irqs < 4; nr_irqs++) {
> + int parent_irq;
> + parent_irq = irq_of_parse_and_map(node, i * 4 + nr_irqs);
> + if (!parent_irq)
> + break;
> +
> + irq_domain_add_legacy(node, 8,
> + irq_orion_gpio_start + nr_irqs * 8,
> + i * 32 + nr_irqs * 8,
> + &irq_domain_simple_ops,
> + (void *)parent_irq);
It has already been pointed out that irq_domain_add_*() can only be
called once for a give *device_node. However, it is fine and
supported to have a single node cover all of the banks of a gpio
controller.
> + irq_set_chained_handler(parent_irq, gpio_irq_handler);
> + irq_set_handler_data(parent_irq,
> + (void *)(i * 32 + nr_irqs * 8));
> + }
> +
> + orion_gpio_init(i * 32, nr_irqs, (u32)reg, 0,
> + irq_orion_gpio_start);
> + irq_orion_gpio_start += nr_irqs;
> + }
> +
> + return 0;
> +}
> +
> +static const struct of_device_id orion_dt_irq_match[] __initconst = {
> + { .compatible = "mrvl,orion-irq", .data = &orion_dt_irq_setup },
> + { .compatible = "mrvl,orion-gpio", .data = &orion_dt_gpio_irq_setup },
> + { }
> +};
> +
> +void __init orion_dt_init_irq(void)
> +{
> + of_irq_init(orion_dt_irq_match);
> +}
> +#endif
--
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies,Ltd.
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