[deliverable/linux.git] / arch / frv / kernel / irq-mb93493.c

/* irq-mb93493.c: MB93493 companion chip interrupt handler
 *
 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/bitops.h>

#include <asm/io.h>
#include <asm/delay.h>
#include <asm/irq.h>
#include <asm/irc-regs.h>
#include <asm/mb93493-irqs.h>
#include <asm/mb93493-regs.h>

#define IRQ_ROUTE_ONE(X) (X##_ROUTE << (X - IRQ_BASE_MB93493))

#define IRQ_ROUTING					\
	(IRQ_ROUTE_ONE(IRQ_MB93493_VDC)		|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_VCC)		|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_OUT)	|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_I2C_0)	|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_I2C_1)	|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_USB)		|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_LOCAL_BUS)	|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_PCMCIA)	|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_GPIO)	|	\
	 IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_IN))

/*
 * daughter board PIC operations
 * - there is no way to ACK interrupts in the MB93493 chip
 */
static void frv_mb93493_mask(struct irq_data *d)
{
	uint32_t iqsr;
	volatile void *piqsr;

	if (IRQ_ROUTING & (1 << (d->irq - IRQ_BASE_MB93493)))
		piqsr = __addr_MB93493_IQSR(1);
	else
		piqsr = __addr_MB93493_IQSR(0);

	iqsr = readl(piqsr);
	iqsr &= ~(1 << (d->irq - IRQ_BASE_MB93493 + 16));
	writel(iqsr, piqsr);
}

static void frv_mb93493_ack(struct irq_data *d)
{
}

static void frv_mb93493_unmask(struct irq_data *d)
{
	uint32_t iqsr;
	volatile void *piqsr;

	if (IRQ_ROUTING & (1 << (d->irq - IRQ_BASE_MB93493)))
		piqsr = __addr_MB93493_IQSR(1);
	else
		piqsr = __addr_MB93493_IQSR(0);

	iqsr = readl(piqsr);
	iqsr |= 1 << (d->irq - IRQ_BASE_MB93493 + 16);
	writel(iqsr, piqsr);
}

static struct irq_chip frv_mb93493_pic = {
	.name		= "mb93093",
	.irq_ack	= frv_mb93493_ack,
	.irq_mask	= frv_mb93493_mask,
	.irq_mask_ack	= frv_mb93493_mask,
	.irq_unmask	= frv_mb93493_unmask,
};

/*
 * MB93493 PIC interrupt handler
 */
static irqreturn_t mb93493_interrupt(int irq, void *_piqsr)
{
	volatile void *piqsr = _piqsr;
	uint32_t iqsr;

	iqsr = readl(piqsr);
	iqsr = iqsr & (iqsr >> 16) & 0xffff;

	/* poll all the triggered IRQs */
	while (iqsr) {
		int irq;

		asm("scan %1,gr0,%0" : "=r"(irq) : "r"(iqsr));
		irq = 31 - irq;
		iqsr &= ~(1 << irq);

		generic_handle_irq(IRQ_BASE_MB93493 + irq);
	}

	return IRQ_HANDLED;
}

/*
 * define an interrupt action for each MB93493 PIC output
 * - use dev_id to indicate the MB93493 PIC input to output mappings
 */
static struct irqaction mb93493_irq[2]  = {
	[0] = {
		.handler	= mb93493_interrupt,
		.flags		= IRQF_SHARED,
		.name		= "mb93493.0",
		.dev_id		= (void *) __addr_MB93493_IQSR(0),
	},
	[1] = {
		.handler	= mb93493_interrupt,
		.flags		= IRQF_SHARED,
		.name		= "mb93493.1",
		.dev_id		= (void *) __addr_MB93493_IQSR(1),
	}
};

/*
 * initialise the motherboard MB93493's PIC
 */
void __init mb93493_init(void)
{
	int irq;

	for (irq = IRQ_BASE_MB93493 + 0; irq <= IRQ_BASE_MB93493 + 10; irq++)
		irq_set_chip_and_handler(irq, &frv_mb93493_pic,
					 handle_edge_irq);

	/* the MB93493 drives external IRQ inputs on the CPU PIC */
	setup_irq(IRQ_CPU_MB93493_0, &mb93493_irq[0]);
	setup_irq(IRQ_CPU_MB93493_1, &mb93493_irq[1]);
}
Commit	Line	Data
1da177e4 LT	1	/* irq-mb93493.c: MB93493 companion chip interrupt handler
1da177e4 LT	2	*
1bcbba30	3	* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
1da177e4 LT	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
1da177e4 LT	12	#include <linux/ptrace.h>
	13	#include <linux/errno.h>
	14	#include <linux/signal.h>
	15	#include <linux/sched.h>
	16	#include <linux/ioport.h>
	17	#include <linux/interrupt.h>
	18	#include <linux/init.h>
	19	#include <linux/irq.h>
1977f032	20	#include <linux/bitops.h>
1da177e4 LT	21
1da177e4 LT	22	#include <asm/io.h>
1da177e4 LT	23	#include <asm/delay.h>
	24	#include <asm/irq.h>
	25	#include <asm/irc-regs.h>
1da177e4	26	#include <asm/mb93493-irqs.h>
1bcbba30	27	#include <asm/mb93493-regs.h>
1da177e4	28
1bcbba30 DH	29	#define IRQ_ROUTE_ONE(X) (X##_ROUTE << (X - IRQ_BASE_MB93493))
	30
	31	#define IRQ_ROUTING \
	32	(IRQ_ROUTE_ONE(IRQ_MB93493_VDC) \| \
	33	IRQ_ROUTE_ONE(IRQ_MB93493_VCC) \| \
	34	IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_OUT) \| \
	35	IRQ_ROUTE_ONE(IRQ_MB93493_I2C_0) \| \
	36	IRQ_ROUTE_ONE(IRQ_MB93493_I2C_1) \| \
	37	IRQ_ROUTE_ONE(IRQ_MB93493_USB) \| \
	38	IRQ_ROUTE_ONE(IRQ_MB93493_LOCAL_BUS) \| \
	39	IRQ_ROUTE_ONE(IRQ_MB93493_PCMCIA) \| \
	40	IRQ_ROUTE_ONE(IRQ_MB93493_GPIO) \| \
	41	IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_IN))
1da177e4	42
1da177e4	43	/*
1bcbba30	44	* daughter board PIC operations
88d6e199	45	* - there is no way to ACK interrupts in the MB93493 chip
1da177e4	46	*/
a55174f1	47	static void frv_mb93493_mask(struct irq_data *d)
1da177e4	48	{
1da177e4	49	uint32_t iqsr;
1bcbba30	50	volatile void *piqsr;
1da177e4	51
a55174f1	52	if (IRQ_ROUTING & (1 << (d->irq - IRQ_BASE_MB93493)))
1bcbba30	53	piqsr = __addr_MB93493_IQSR(1);
1da177e4	54	else
1bcbba30	55	piqsr = __addr_MB93493_IQSR(0);
1da177e4	56
1bcbba30	57	iqsr = readl(piqsr);
a55174f1	58	iqsr &= ~(1 << (d->irq - IRQ_BASE_MB93493 + 16));
1bcbba30 DH	59	writel(iqsr, piqsr);
	60	}
	61
a55174f1	62	static void frv_mb93493_ack(struct irq_data *d)
88d6e199 DH	63	{
	64	}
	65
a55174f1	66	static void frv_mb93493_unmask(struct irq_data *d)
1bcbba30 DH	67	{
	68	uint32_t iqsr;
	69	volatile void *piqsr;
	70
a55174f1	71	if (IRQ_ROUTING & (1 << (d->irq - IRQ_BASE_MB93493)))
1bcbba30	72	piqsr = __addr_MB93493_IQSR(1);
1da177e4	73	else
1bcbba30	74	piqsr = __addr_MB93493_IQSR(0);
1da177e4	75
1bcbba30	76	iqsr = readl(piqsr);
a55174f1	77	iqsr \|= 1 << (d->irq - IRQ_BASE_MB93493 + 16);
1bcbba30	78	writel(iqsr, piqsr);
1da177e4 LT	79	}
1da177e4 LT	80
1bcbba30 DH	81	static struct irq_chip frv_mb93493_pic = {
1bcbba30 DH	82	.name = "mb93093",
a55174f1 TG	83	.irq_ack = frv_mb93493_ack,
	84	.irq_mask = frv_mb93493_mask,
	85	.irq_mask_ack = frv_mb93493_mask,
	86	.irq_unmask = frv_mb93493_unmask,
1bcbba30 DH	87	};
	88
	89	/*
	90	* MB93493 PIC interrupt handler
	91	*/
7d12e780	92	static irqreturn_t mb93493_interrupt(int irq, void *_piqsr)
1da177e4	93	{
1bcbba30	94	volatile void *piqsr = _piqsr;
1bcbba30 DH	95	uint32_t iqsr;
	96
	97	iqsr = readl(piqsr);
	98	iqsr = iqsr & (iqsr >> 16) & 0xffff;
	99
	100	/* poll all the triggered IRQs */
	101	while (iqsr) {
	102	int irq;
	103
	104	asm("scan %1,gr0,%0" : "=r"(irq) : "r"(iqsr));
	105	irq = 31 - irq;
	106	iqsr &= ~(1 << irq);
	107
7d12e780	108	generic_handle_irq(IRQ_BASE_MB93493 + irq);
1bcbba30 DH	109	}
1bcbba30 DH	110
88d6e199	111	return IRQ_HANDLED;
1da177e4 LT	112	}
1da177e4 LT	113
1bcbba30 DH	114	/*
	115	* define an interrupt action for each MB93493 PIC output
	116	* - use dev_id to indicate the MB93493 PIC input to output mappings
	117	*/
	118	static struct irqaction mb93493_irq[2] = {
	119	[0] = {
	120	.handler = mb93493_interrupt,
08e4cf4b	121	.flags = IRQF_SHARED,
1bcbba30 DH	122	.name = "mb93493.0",
	123	.dev_id = (void *) __addr_MB93493_IQSR(0),
	124	},
	125	[1] = {
	126	.handler = mb93493_interrupt,
08e4cf4b	127	.flags = IRQF_SHARED,
1bcbba30 DH	128	.name = "mb93493.1",
	129	.dev_id = (void *) __addr_MB93493_IQSR(1),
	130	}
	131	};
	132
	133	/*
	134	* initialise the motherboard MB93493's PIC
	135	*/
	136	void __init mb93493_init(void)
1da177e4	137	{
1bcbba30 DH	138	int irq;
	139
	140	for (irq = IRQ_BASE_MB93493 + 0; irq <= IRQ_BASE_MB93493 + 10; irq++)
de2e95a6 TG	141	irq_set_chip_and_handler(irq, &frv_mb93493_pic,
de2e95a6 TG	142	handle_edge_irq);
1bcbba30 DH	143
	144	/* the MB93493 drives external IRQ inputs on the CPU PIC */
	145	setup_irq(IRQ_CPU_MB93493_0, &mb93493_irq[0]);
	146	setup_irq(IRQ_CPU_MB93493_1, &mb93493_irq[1]);
1da177e4	147	}