[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/system.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(unsigned int irq)
{
	uint32_t iqsr;
	volatile void *piqsr;

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

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

static void frv_mb93493_ack(unsigned int irq)
{
}

static void frv_mb93493_unmask(unsigned int irq)
{
	uint32_t iqsr;
	volatile void *piqsr;

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

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

static struct irq_chip frv_mb93493_pic = {
	.name		= "mb93093",
	.ack		= frv_mb93493_ack,
	.mask		= frv_mb93493_mask,
	.mask_ack	= frv_mb93493_mask,
	.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_DISABLED | IRQF_SHARED,
		.mask		= CPU_MASK_NONE,
		.name		= "mb93493.0",
		.dev_id		= (void *) __addr_MB93493_IQSR(0),
	},
	[1] = {
		.handler	= mb93493_interrupt,
		.flags		= IRQF_DISABLED | IRQF_SHARED,
		.mask		= CPU_MASK_NONE,
		.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++)
		set_irq_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
	22	#include <asm/io.h>
	23	#include <asm/system.h>
1da177e4 LT	24	#include <asm/delay.h>
	25	#include <asm/irq.h>
	26	#include <asm/irc-regs.h>
1da177e4	27	#include <asm/mb93493-irqs.h>
1bcbba30	28	#include <asm/mb93493-regs.h>
1da177e4	29
1bcbba30 DH	30	#define IRQ_ROUTE_ONE(X) (X##_ROUTE << (X - IRQ_BASE_MB93493))
	31
	32	#define IRQ_ROUTING \
	33	(IRQ_ROUTE_ONE(IRQ_MB93493_VDC) \| \
	34	IRQ_ROUTE_ONE(IRQ_MB93493_VCC) \| \
	35	IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_OUT) \| \
	36	IRQ_ROUTE_ONE(IRQ_MB93493_I2C_0) \| \
	37	IRQ_ROUTE_ONE(IRQ_MB93493_I2C_1) \| \
	38	IRQ_ROUTE_ONE(IRQ_MB93493_USB) \| \
	39	IRQ_ROUTE_ONE(IRQ_MB93493_LOCAL_BUS) \| \
	40	IRQ_ROUTE_ONE(IRQ_MB93493_PCMCIA) \| \
	41	IRQ_ROUTE_ONE(IRQ_MB93493_GPIO) \| \
	42	IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_IN))
1da177e4	43
1da177e4	44	/*
1bcbba30	45	* daughter board PIC operations
88d6e199	46	* - there is no way to ACK interrupts in the MB93493 chip
1da177e4	47	*/
88d6e199	48	static void frv_mb93493_mask(unsigned int irq)
1da177e4	49	{
1da177e4	50	uint32_t iqsr;
1bcbba30	51	volatile void *piqsr;
1da177e4	52
1bcbba30 DH	53	if (IRQ_ROUTING & (1 << (irq - IRQ_BASE_MB93493)))
1bcbba30 DH	54	piqsr = __addr_MB93493_IQSR(1);
1da177e4	55	else
1bcbba30	56	piqsr = __addr_MB93493_IQSR(0);
1da177e4	57
1bcbba30	58	iqsr = readl(piqsr);
88d6e199	59	iqsr &= ~(1 << (irq - IRQ_BASE_MB93493 + 16));
1bcbba30 DH	60	writel(iqsr, piqsr);
	61	}
	62
88d6e199 DH	63	static void frv_mb93493_ack(unsigned int irq)
	64	{
	65	}
	66
	67	static void frv_mb93493_unmask(unsigned int irq)
1bcbba30 DH	68	{
	69	uint32_t iqsr;
	70	volatile void *piqsr;
	71
	72	if (IRQ_ROUTING & (1 << (irq - IRQ_BASE_MB93493)))
	73	piqsr = __addr_MB93493_IQSR(1);
1da177e4	74	else
1bcbba30	75	piqsr = __addr_MB93493_IQSR(0);
1da177e4	76
1bcbba30	77	iqsr = readl(piqsr);
88d6e199	78	iqsr \|= 1 << (irq - IRQ_BASE_MB93493 + 16);
1bcbba30	79	writel(iqsr, piqsr);
1da177e4 LT	80	}
1da177e4 LT	81
1bcbba30 DH	82	static struct irq_chip frv_mb93493_pic = {
1bcbba30 DH	83	.name = "mb93093",
1bcbba30	84	.ack = frv_mb93493_ack,
88d6e199 DH	85	.mask = frv_mb93493_mask,
	86	.mask_ack = frv_mb93493_mask,
	87	.unmask = frv_mb93493_unmask,
1bcbba30 DH	88	};
	89
	90	/*
	91	* MB93493 PIC interrupt handler
	92	*/
7d12e780	93	static irqreturn_t mb93493_interrupt(int irq, void *_piqsr)
1da177e4	94	{
1bcbba30	95	volatile void *piqsr = _piqsr;
1bcbba30 DH	96	uint32_t iqsr;
	97
	98	iqsr = readl(piqsr);
	99	iqsr = iqsr & (iqsr >> 16) & 0xffff;
	100
	101	/* poll all the triggered IRQs */
	102	while (iqsr) {
	103	int irq;
	104
	105	asm("scan %1,gr0,%0" : "=r"(irq) : "r"(iqsr));
	106	irq = 31 - irq;
	107	iqsr &= ~(1 << irq);
	108
7d12e780	109	generic_handle_irq(IRQ_BASE_MB93493 + irq);
1bcbba30 DH	110	}
1bcbba30 DH	111
88d6e199	112	return IRQ_HANDLED;
1da177e4 LT	113	}
1da177e4 LT	114
1bcbba30 DH	115	/*
	116	* define an interrupt action for each MB93493 PIC output
	117	* - use dev_id to indicate the MB93493 PIC input to output mappings
	118	*/
	119	static struct irqaction mb93493_irq[2] = {
	120	[0] = {
	121	.handler = mb93493_interrupt,
	122	.flags = IRQF_DISABLED \| IRQF_SHARED,
	123	.mask = CPU_MASK_NONE,
	124	.name = "mb93493.0",
	125	.dev_id = (void *) __addr_MB93493_IQSR(0),
	126	},
	127	[1] = {
	128	.handler = mb93493_interrupt,
	129	.flags = IRQF_DISABLED \| IRQF_SHARED,
	130	.mask = CPU_MASK_NONE,
	131	.name = "mb93493.1",
	132	.dev_id = (void *) __addr_MB93493_IQSR(1),
	133	}
	134	};
	135
	136	/*
	137	* initialise the motherboard MB93493's PIC
	138	*/
	139	void __init mb93493_init(void)
1da177e4	140	{
1bcbba30 DH	141	int irq;
	142
	143	for (irq = IRQ_BASE_MB93493 + 0; irq <= IRQ_BASE_MB93493 + 10; irq++)
	144	set_irq_chip_and_handler(irq, &frv_mb93493_pic, handle_edge_irq);
	145
	146	/* the MB93493 drives external IRQ inputs on the CPU PIC */
	147	setup_irq(IRQ_CPU_MB93493_0, &mb93493_irq[0]);
	148	setup_irq(IRQ_CPU_MB93493_1, &mb93493_irq[1]);
1da177e4	149	}