[deliverable/linux.git] / drivers / irqchip / irq-sirfsoc.c

/*
 * interrupt controller support for CSR SiRFprimaII
 *
 * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
 *
 * Licensed under GPLv2 or later.
 */

#include <linux/init.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/irqdomain.h>
#include <linux/syscore_ops.h>
#include <asm/mach/irq.h>
#include <asm/exception.h>
#include "irqchip.h"

#define SIRFSOC_INT_RISC_MASK0          0x0018
#define SIRFSOC_INT_RISC_MASK1          0x001C
#define SIRFSOC_INT_RISC_LEVEL0         0x0020
#define SIRFSOC_INT_RISC_LEVEL1         0x0024
#define SIRFSOC_INIT_IRQ_ID		0x0038

#define SIRFSOC_NUM_IRQS		64

static struct irq_domain *sirfsoc_irqdomain;

static __init void
sirfsoc_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
{
	struct irq_chip_generic *gc;
	struct irq_chip_type *ct;
	int ret;
	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
	unsigned int set = IRQ_LEVEL;

	ret = irq_alloc_domain_generic_chips(sirfsoc_irqdomain, num, 1, "irq_sirfsoc",
		handle_level_irq, clr, set, IRQ_GC_INIT_MASK_CACHE);

	gc = irq_get_domain_generic_chip(sirfsoc_irqdomain, irq_start);
	gc->reg_base = base;
	ct = gc->chip_types;
	ct->chip.irq_mask = irq_gc_mask_clr_bit;
	ct->chip.irq_unmask = irq_gc_mask_set_bit;
	ct->regs.mask = SIRFSOC_INT_RISC_MASK0;
}

static asmlinkage void __exception_irq_entry sirfsoc_handle_irq(struct pt_regs *regs)
{
	void __iomem *base = sirfsoc_irqdomain->host_data;
	u32 irqstat, irqnr;

	irqstat = readl_relaxed(base + SIRFSOC_INIT_IRQ_ID);
	irqnr = irq_find_mapping(sirfsoc_irqdomain, irqstat & 0xff);

	handle_IRQ(irqnr, regs);
}

static int __init sirfsoc_irq_init(struct device_node *np, struct device_node *parent)
{
	void __iomem *base = of_iomap(np, 0);
	if (!base)
		panic("unable to map intc cpu registers\n");

	sirfsoc_irqdomain = irq_domain_add_linear(np, SIRFSOC_NUM_IRQS,
		&irq_generic_chip_ops, base);

	sirfsoc_alloc_gc(base, 0, 32);
	sirfsoc_alloc_gc(base + 4, 32, SIRFSOC_NUM_IRQS - 32);

	writel_relaxed(0, base + SIRFSOC_INT_RISC_LEVEL0);
	writel_relaxed(0, base + SIRFSOC_INT_RISC_LEVEL1);

	writel_relaxed(0, base + SIRFSOC_INT_RISC_MASK0);
	writel_relaxed(0, base + SIRFSOC_INT_RISC_MASK1);

	set_handle_irq(sirfsoc_handle_irq);

	return 0;
}
IRQCHIP_DECLARE(sirfsoc_intc, "sirf,prima2-intc", sirfsoc_irq_init);

struct sirfsoc_irq_status {
	u32 mask0;
	u32 mask1;
	u32 level0;
	u32 level1;
};

static struct sirfsoc_irq_status sirfsoc_irq_st;

static int sirfsoc_irq_suspend(void)
{
	void __iomem *base = sirfsoc_irqdomain->host_data;

	sirfsoc_irq_st.mask0 = readl_relaxed(base + SIRFSOC_INT_RISC_MASK0);
	sirfsoc_irq_st.mask1 = readl_relaxed(base + SIRFSOC_INT_RISC_MASK1);
	sirfsoc_irq_st.level0 = readl_relaxed(base + SIRFSOC_INT_RISC_LEVEL0);
	sirfsoc_irq_st.level1 = readl_relaxed(base + SIRFSOC_INT_RISC_LEVEL1);

	return 0;
}

static void sirfsoc_irq_resume(void)
{
	void __iomem *base = sirfsoc_irqdomain->host_data;

	writel_relaxed(sirfsoc_irq_st.mask0, base + SIRFSOC_INT_RISC_MASK0);
	writel_relaxed(sirfsoc_irq_st.mask1, base + SIRFSOC_INT_RISC_MASK1);
	writel_relaxed(sirfsoc_irq_st.level0, base + SIRFSOC_INT_RISC_LEVEL0);
	writel_relaxed(sirfsoc_irq_st.level1, base + SIRFSOC_INT_RISC_LEVEL1);
}

static struct syscore_ops sirfsoc_irq_syscore_ops = {
	.suspend	= sirfsoc_irq_suspend,
	.resume		= sirfsoc_irq_resume,
};

static int __init sirfsoc_irq_pm_init(void)
{
	if (!sirfsoc_irqdomain)
		return 0;

	register_syscore_ops(&sirfsoc_irq_syscore_ops);
	return 0;
}
device_initcall(sirfsoc_irq_pm_init);
Commit	Line	Data
60dbd768 AB	1	/*
	2	* interrupt controller support for CSR SiRFprimaII
	3	*
	4	* Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
	5	*
	6	* Licensed under GPLv2 or later.
	7	*/
	8
	9	#include <linux/init.h>
	10	#include <linux/io.h>
	11	#include <linux/irq.h>
	12	#include <linux/of.h>
	13	#include <linux/of_address.h>
	14	#include <linux/irqdomain.h>
	15	#include <linux/syscore_ops.h>
	16	#include <asm/mach/irq.h>
	17	#include <asm/exception.h>
	18	#include "irqchip.h"
	19
	20	#define SIRFSOC_INT_RISC_MASK0 0x0018
	21	#define SIRFSOC_INT_RISC_MASK1 0x001C
	22	#define SIRFSOC_INT_RISC_LEVEL0 0x0020
	23	#define SIRFSOC_INT_RISC_LEVEL1 0x0024
	24	#define SIRFSOC_INIT_IRQ_ID 0x0038
	25
29eb51a7	26	#define SIRFSOC_NUM_IRQS 64
60dbd768 AB	27
	28	static struct irq_domain *sirfsoc_irqdomain;
	29
	30	static __init void
	31	sirfsoc_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
	32	{
	33	struct irq_chip_generic *gc;
	34	struct irq_chip_type *ct;
29eb51a7 BS	35	int ret;
29eb51a7 BS	36	unsigned int clr = IRQ_NOREQUEST \| IRQ_NOPROBE \| IRQ_NOAUTOEN;
a87010ef	37	unsigned int set = IRQ_LEVEL;
60dbd768	38
29eb51a7	39	ret = irq_alloc_domain_generic_chips(sirfsoc_irqdomain, num, 1, "irq_sirfsoc",
a87010ef	40	handle_level_irq, clr, set, IRQ_GC_INIT_MASK_CACHE);
60dbd768	41
29eb51a7 BS	42	gc = irq_get_domain_generic_chip(sirfsoc_irqdomain, irq_start);
	43	gc->reg_base = base;
	44	ct = gc->chip_types;
60dbd768 AB	45	ct->chip.irq_mask = irq_gc_mask_clr_bit;
	46	ct->chip.irq_unmask = irq_gc_mask_set_bit;
	47	ct->regs.mask = SIRFSOC_INT_RISC_MASK0;
60dbd768 AB	48	}
	49
	50	static asmlinkage void __exception_irq_entry sirfsoc_handle_irq(struct pt_regs *regs)
	51	{
	52	void __iomem *base = sirfsoc_irqdomain->host_data;
	53	u32 irqstat, irqnr;
	54
	55	irqstat = readl_relaxed(base + SIRFSOC_INIT_IRQ_ID);
	56	irqnr = irq_find_mapping(sirfsoc_irqdomain, irqstat & 0xff);
	57
	58	handle_IRQ(irqnr, regs);
	59	}
	60
	61	static int __init sirfsoc_irq_init(struct device_node np, struct device_node parent)
	62	{
	63	void __iomem *base = of_iomap(np, 0);
	64	if (!base)
	65	panic("unable to map intc cpu registers\n");
	66
29eb51a7 BS	67	sirfsoc_irqdomain = irq_domain_add_linear(np, SIRFSOC_NUM_IRQS,
29eb51a7 BS	68	&irq_generic_chip_ops, base);
60dbd768 AB	69
	70	sirfsoc_alloc_gc(base, 0, 32);
	71	sirfsoc_alloc_gc(base + 4, 32, SIRFSOC_NUM_IRQS - 32);
	72
	73	writel_relaxed(0, base + SIRFSOC_INT_RISC_LEVEL0);
	74	writel_relaxed(0, base + SIRFSOC_INT_RISC_LEVEL1);
	75
	76	writel_relaxed(0, base + SIRFSOC_INT_RISC_MASK0);
	77	writel_relaxed(0, base + SIRFSOC_INT_RISC_MASK1);
	78
	79	set_handle_irq(sirfsoc_handle_irq);
	80
	81	return 0;
	82	}
	83	IRQCHIP_DECLARE(sirfsoc_intc, "sirf,prima2-intc", sirfsoc_irq_init);
	84
	85	struct sirfsoc_irq_status {
	86	u32 mask0;
	87	u32 mask1;
	88	u32 level0;
	89	u32 level1;
	90	};
	91
	92	static struct sirfsoc_irq_status sirfsoc_irq_st;
	93
	94	static int sirfsoc_irq_suspend(void)
	95	{
	96	void __iomem *base = sirfsoc_irqdomain->host_data;
	97
	98	sirfsoc_irq_st.mask0 = readl_relaxed(base + SIRFSOC_INT_RISC_MASK0);
	99	sirfsoc_irq_st.mask1 = readl_relaxed(base + SIRFSOC_INT_RISC_MASK1);
	100	sirfsoc_irq_st.level0 = readl_relaxed(base + SIRFSOC_INT_RISC_LEVEL0);
	101	sirfsoc_irq_st.level1 = readl_relaxed(base + SIRFSOC_INT_RISC_LEVEL1);
	102
	103	return 0;
	104	}
	105
	106	static void sirfsoc_irq_resume(void)
	107	{
	108	void __iomem *base = sirfsoc_irqdomain->host_data;
	109
	110	writel_relaxed(sirfsoc_irq_st.mask0, base + SIRFSOC_INT_RISC_MASK0);
	111	writel_relaxed(sirfsoc_irq_st.mask1, base + SIRFSOC_INT_RISC_MASK1);
	112	writel_relaxed(sirfsoc_irq_st.level0, base + SIRFSOC_INT_RISC_LEVEL0);
	113	writel_relaxed(sirfsoc_irq_st.level1, base + SIRFSOC_INT_RISC_LEVEL1);
	114	}
	115
	116	static struct syscore_ops sirfsoc_irq_syscore_ops = {
	117	.suspend = sirfsoc_irq_suspend,
	118	.resume = sirfsoc_irq_resume,
	119	};
	120
	121	static int __init sirfsoc_irq_pm_init(void)
	122	{
	123	if (!sirfsoc_irqdomain)
	124	return 0;
	125
	126	register_syscore_ops(&sirfsoc_irq_syscore_ops);
	127	return 0;
	128	}
	129	device_initcall(sirfsoc_irq_pm_init);