Commit b29e8b87 authored by Alban Bedel's avatar Alban Bedel Committed by Ralf Baechle
Browse files

MIPS: ath79: Add OF support to the IRQ controllers 



Add OF support for the CPU and MISC interrupt controllers of most
supported ATH79 devices.

Signed-off-by: default avatarAlban Bedel <albeu@free.fr>
Cc: linux-mips@linux-mips.org
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent bb35586f

arch/mips/ath79/irq.c

+86 −1
Original line number Diff line number Diff line
@@ -15,7 +15,9 @@ 
#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/irqchip.h>

#include <linux/of_irq.h>

#include "../../../drivers/irqchip/irqchip.h"



#include <asm/irq_cpu.h>

#include <asm/mipsregs.h>
@@ -23,6 +25,7 @@ 
#include <asm/mach-ath79/ath79.h>

#include <asm/mach-ath79/ar71xx_regs.h>

#include "common.h"

#include "machtypes.h"



static void ath79_misc_irq_handler(unsigned int irq, struct irq_desc *desc)

{
@@ -268,8 +271,90 @@ asmlinkage void plat_irq_dispatch(void) 
	}

}



#ifdef CONFIG_IRQCHIP

static int misc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)

{

	irq_set_chip_and_handler(irq, &ath79_misc_irq_chip, handle_level_irq);

	return 0;

}



static const struct irq_domain_ops misc_irq_domain_ops = {

	.xlate = irq_domain_xlate_onecell,

	.map = misc_map,

};



static int __init ath79_misc_intc_of_init(

	struct device_node *node, struct device_node *parent)

{

	void __iomem *base = ath79_reset_base;

	struct irq_domain *domain;

	int irq;



	irq = irq_of_parse_and_map(node, 0);

	if (!irq)

		panic("Failed to get MISC IRQ");



	domain = irq_domain_add_legacy(node, ATH79_MISC_IRQ_COUNT,

			ATH79_MISC_IRQ_BASE, 0, &misc_irq_domain_ops, NULL);

	if (!domain)

		panic("Failed to add MISC irqdomain");



	/* Disable and clear all interrupts */

	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE);

	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);





	irq_set_chained_handler(irq, ath79_misc_irq_handler);



	return 0;

}

IRQCHIP_DECLARE(ath79_misc_intc, "qca,ar7100-misc-intc",

		ath79_misc_intc_of_init);



static int __init ar79_cpu_intc_of_init(

	struct device_node *node, struct device_node *parent)

{

	int err, i, count;



	/* Fill the irq_wb_chan table */

	count = of_count_phandle_with_args(

		node, "qca,ddr-wb-channels", "#qca,ddr-wb-channel-cells");



	for (i = 0; i < count; i++) {

		struct of_phandle_args args;

		u32 irq = i;



		of_property_read_u32_index(

			node, "qca,ddr-wb-channel-interrupts", i, &irq);

		if (irq >= ARRAY_SIZE(irq_wb_chan))

			continue;



		err = of_parse_phandle_with_args(

			node, "qca,ddr-wb-channels",

			"#qca,ddr-wb-channel-cells",

			i, &args);

		if (err)

			return err;



		irq_wb_chan[irq] = args.args[0];

		pr_info("IRQ: Set flush channel of IRQ%d to %d\n",

			irq, args.args[0]);

	}



	return mips_cpu_irq_of_init(node, parent);

}

IRQCHIP_DECLARE(ar79_cpu_intc, "qca,ar7100-cpu-intc",

		ar79_cpu_intc_of_init);



#endif



void __init arch_init_irq(void)

{

	if (mips_machtype == ATH79_MACH_GENERIC_OF) {

		irqchip_init();

		return;

	}



	if (soc_is_ar71xx() || soc_is_ar724x() ||

	    soc_is_ar913x() || soc_is_ar933x()) {

		irq_wb_chan[2] = 3;