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ARM: orion5x: switch to DT interrupts and timer

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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 board-dt.c to no longer have an ->init_time() callback,
   since the default callback will work fine: it calls
   clocksource_of_init() and of_clk_init(), as needed.

 * Implement a multi-IRQ handler for non-DT platforms in
   mach-orion5x/irq.c.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Link: https://lkml.kernel.org/r/1398202002-28530-24-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Thomas Petazzoni 2014-04-22 23:26:27 +02:00 committed by Jason Cooper
parent deac3d874e
commit ab5ab9dbe6
4 changed files with 50 additions and 14 deletions
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19
arch/arm/boot/dts/orion5x.dtsi
View file

@ -78,6 +78,15 @@
status = "disabled";
};
bridge_intc: bridge-interrupt-ctrl@20110 {
compatible = "marvell,orion-bridge-intc";
interrupt-controller;
#interrupt-cells = <1>;
reg = <0x20110 0x8>;
interrupts = <0>;
marvell,#interrupts = <4>;
};
intc: interrupt-controller@20200 {
compatible = "marvell,orion-intc";
interrupt-controller;
@ -85,9 +94,19 @@
reg = <0x20200 0x08>;
};
timer: timer@20300 {
compatible = "marvell,orion-timer";
reg = <0x20300 0x20>;
interrupt-parent = <&bridge_intc>;
interrupts = <1>, <2>;
clocks = <&core_clk 0>;
};
wdt: wdt@20300 {
compatible = "marvell,orion-wdt";
reg = <0x20300 0x28>;
interrupt-parent = <&bridge_intc>;
interrupts = <3>;
status = "okay";
};

2
arch/arm/mach-orion5x/Kconfig
View file

@ -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.

15
arch/arm/mach-orion5x/board-dt.c
View file

@ -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>
@ -36,17 +37,6 @@ 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);
}
static void __init orion5x_dt_init(void)
{
char *dev_name;
@ -86,9 +76,6 @@ static const char *orion5x_dt_compat[] = {
DT_MACHINE_START(ORION5X_DT, "Marvell Orion5x (Flattened Device Tree)")
/* Maintainer: Thomas Petazzoni <thomas.petazzoni@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,
.dt_compat = orion5x_dt_compat,

28
arch/arm/mach-orion5x/irq.c
View file

@ -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.
*/