[deliverable/linux.git] / arch / mips / kernel / irq-msc01.c

/*
 * 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.
 *
 * Copyright (c) 2004 MIPS Inc
 * Author: chris@mips.com
 *
 * Copyright (C) 2004, 06 Ralf Baechle <ralf@linux-mips.org>
 */
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/msc01_ic.h>

static unsigned long _icctrl_msc;
#define MSC01_IC_REG_BASE	_icctrl_msc

#define MSCIC_WRITE(reg, data)	do { *(volatile u32 *)(reg) = data; } while (0)
#define MSCIC_READ(reg, data)	do { data = *(volatile u32 *)(reg); } while (0)

static unsigned int irq_base;

/* mask off an interrupt */
static inline void mask_msc_irq(unsigned int irq)
{
	if (irq < (irq_base + 32))
		MSCIC_WRITE(MSC01_IC_DISL, 1<<(irq - irq_base));
	else
		MSCIC_WRITE(MSC01_IC_DISH, 1<<(irq - irq_base - 32));
}

/* unmask an interrupt */
static inline void unmask_msc_irq(unsigned int irq)
{
	if (irq < (irq_base + 32))
		MSCIC_WRITE(MSC01_IC_ENAL, 1<<(irq - irq_base));
	else
		MSCIC_WRITE(MSC01_IC_ENAH, 1<<(irq - irq_base - 32));
}

/*
 * Masks and ACKs an IRQ
 */
static void level_mask_and_ack_msc_irq(unsigned int irq)
{
	mask_msc_irq(irq);
	if (!cpu_has_veic)
		MSCIC_WRITE(MSC01_IC_EOI, 0);
	/* This actually needs to be a call into platform code */
	smtc_im_ack_irq(irq);
}

/*
 * Masks and ACKs an IRQ
 */
static void edge_mask_and_ack_msc_irq(unsigned int irq)
{
	mask_msc_irq(irq);
	if (!cpu_has_veic)
		MSCIC_WRITE(MSC01_IC_EOI, 0);
	else {
		u32 r;
		MSCIC_READ(MSC01_IC_SUP+irq*8, r);
		MSCIC_WRITE(MSC01_IC_SUP+irq*8, r | ~MSC01_IC_SUP_EDGE_BIT);
		MSCIC_WRITE(MSC01_IC_SUP+irq*8, r);
	}
	smtc_im_ack_irq(irq);
}

/*
 * End IRQ processing
 */
static void end_msc_irq(unsigned int irq)
{
	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
		unmask_msc_irq(irq);
}

/*
 * Interrupt handler for interrupts coming from SOC-it.
 */
void ll_msc_irq(void)
{
 	unsigned int irq;

	/* read the interrupt vector register */
	MSCIC_READ(MSC01_IC_VEC, irq);
	if (irq < 64)
		do_IRQ(irq + irq_base);
	else {
		/* Ignore spurious interrupt */
	}
}

void
msc_bind_eic_interrupt (unsigned int irq, unsigned int set)
{
	MSCIC_WRITE(MSC01_IC_RAMW,
		    (irq<<MSC01_IC_RAMW_ADDR_SHF) | (set<<MSC01_IC_RAMW_DATA_SHF));
}

struct irq_chip msc_levelirq_type = {
	.name = "SOC-it-Level",
	.ack = level_mask_and_ack_msc_irq,
	.mask = mask_msc_irq,
	.mask_ack = level_mask_and_ack_msc_irq,
	.unmask = unmask_msc_irq,
	.eoi = unmask_msc_irq,
	.end = end_msc_irq,
};

struct irq_chip msc_edgeirq_type = {
	.name = "SOC-it-Edge",
	.ack = edge_mask_and_ack_msc_irq,
	.mask = mask_msc_irq,
	.mask_ack = edge_mask_and_ack_msc_irq,
	.unmask = unmask_msc_irq,
	.eoi = unmask_msc_irq,
	.end = end_msc_irq,
};


void __init init_msc_irqs(unsigned long icubase, unsigned int irqbase, msc_irqmap_t *imp, int nirq)
{
	extern void (*board_bind_eic_interrupt)(unsigned int irq, unsigned int regset);

	_icctrl_msc = (unsigned long) ioremap (icubase, 0x40000);

	/* Reset interrupt controller - initialises all registers to 0 */
	MSCIC_WRITE(MSC01_IC_RST, MSC01_IC_RST_RST_BIT);

	board_bind_eic_interrupt = &msc_bind_eic_interrupt;

	for (; nirq >= 0; nirq--, imp++) {
		int n = imp->im_irq;

		switch (imp->im_type) {
		case MSC01_IRQ_EDGE:
			set_irq_chip(irqbase+n, &msc_edgeirq_type);
			if (cpu_has_veic)
				MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT);
			else
				MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT | imp->im_lvl);
			break;
		case MSC01_IRQ_LEVEL:
			set_irq_chip(irqbase+n, &msc_levelirq_type);
			if (cpu_has_veic)
				MSCIC_WRITE(MSC01_IC_SUP+n*8, 0);
			else
				MSCIC_WRITE(MSC01_IC_SUP+n*8, imp->im_lvl);
		}
	}

	irq_base = irqbase;

	MSCIC_WRITE(MSC01_IC_GENA, MSC01_IC_GENA_GENA_BIT);	/* Enable interrupt generation */

}
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* This program is free software; you can redistribute it and/or modify it
	3	* under the terms of the GNU General Public License as published by the
	4	* Free Software Foundation; either version 2 of the License, or (at your
	5	* option) any later version.
27f76819 RB	6	*
	7	* Copyright (c) 2004 MIPS Inc
	8	* Author: chris@mips.com
	9	*
	10	* Copyright (C) 2004, 06 Ralf Baechle <ralf@linux-mips.org>
1da177e4 LT	11	*/
	12	#include <linux/module.h>
	13	#include <linux/interrupt.h>
	14	#include <linux/kernel.h>
1da177e4 LT	15	#include <linux/sched.h>
	16	#include <linux/kernel_stat.h>
	17	#include <asm/io.h>
	18	#include <asm/irq.h>
	19	#include <asm/msc01_ic.h>
	20
	21	static unsigned long _icctrl_msc;
	22	#define MSC01_IC_REG_BASE _icctrl_msc
	23
	24	#define MSCIC_WRITE(reg, data) do { (volatile u32 )(reg) = data; } while (0)
	25	#define MSCIC_READ(reg, data) do { data = (volatile u32 )(reg); } while (0)
	26
	27	static unsigned int irq_base;
	28
	29	/* mask off an interrupt */
	30	static inline void mask_msc_irq(unsigned int irq)
	31	{
	32	if (irq < (irq_base + 32))
	33	MSCIC_WRITE(MSC01_IC_DISL, 1<<(irq - irq_base));
	34	else
	35	MSCIC_WRITE(MSC01_IC_DISH, 1<<(irq - irq_base - 32));
	36	}
	37
	38	/* unmask an interrupt */
	39	static inline void unmask_msc_irq(unsigned int irq)
	40	{
	41	if (irq < (irq_base + 32))
	42	MSCIC_WRITE(MSC01_IC_ENAL, 1<<(irq - irq_base));
	43	else
	44	MSCIC_WRITE(MSC01_IC_ENAH, 1<<(irq - irq_base - 32));
	45	}
	46
1da177e4 LT	47	/*
	48	* Masks and ACKs an IRQ
	49	*/
	50	static void level_mask_and_ack_msc_irq(unsigned int irq)
	51	{
	52	mask_msc_irq(irq);
e01402b1	53	if (!cpu_has_veic)
1da177e4	54	MSCIC_WRITE(MSC01_IC_EOI, 0);
41c594ab	55	/* This actually needs to be a call into platform code */
1146fe30	56	smtc_im_ack_irq(irq);
1da177e4 LT	57	}
	58
	59	/*
	60	* Masks and ACKs an IRQ
	61	*/
	62	static void edge_mask_and_ack_msc_irq(unsigned int irq)
	63	{
	64	mask_msc_irq(irq);
e01402b1	65	if (!cpu_has_veic)
1da177e4 LT	66	MSCIC_WRITE(MSC01_IC_EOI, 0);
	67	else {
	68	u32 r;
	69	MSCIC_READ(MSC01_IC_SUP+irq*8, r);
	70	MSCIC_WRITE(MSC01_IC_SUP+irq*8, r \| ~MSC01_IC_SUP_EDGE_BIT);
	71	MSCIC_WRITE(MSC01_IC_SUP+irq*8, r);
	72	}
1146fe30	73	smtc_im_ack_irq(irq);
1da177e4 LT	74	}
	75
	76	/*
	77	* End IRQ processing
	78	*/
	79	static void end_msc_irq(unsigned int irq)
	80	{
	81	if (!(irq_desc[irq].status & (IRQ_DISABLED\|IRQ_INPROGRESS)))
	82	unmask_msc_irq(irq);
	83	}
	84
	85	/*
	86	* Interrupt handler for interrupts coming from SOC-it.
	87	*/
937a8015	88	void ll_msc_irq(void)
1da177e4 LT	89	{
	90	unsigned int irq;
	91
	92	/* read the interrupt vector register */
	93	MSCIC_READ(MSC01_IC_VEC, irq);
	94	if (irq < 64)
937a8015	95	do_IRQ(irq + irq_base);
1da177e4 LT	96	else {
	97	/* Ignore spurious interrupt */
	98	}
	99	}
	100
	101	void
	102	msc_bind_eic_interrupt (unsigned int irq, unsigned int set)
	103	{
	104	MSCIC_WRITE(MSC01_IC_RAMW,
	105	(irq<<MSC01_IC_RAMW_ADDR_SHF) \| (set<<MSC01_IC_RAMW_DATA_SHF));
	106	}
	107
94dee171	108	struct irq_chip msc_levelirq_type = {
70d21cde	109	.name = "SOC-it-Level",
8ab00b9a	110	.ack = level_mask_and_ack_msc_irq,
1603b5ac AN	111	.mask = mask_msc_irq,
	112	.mask_ack = level_mask_and_ack_msc_irq,
	113	.unmask = unmask_msc_irq,
1417836e	114	.eoi = unmask_msc_irq,
8ab00b9a	115	.end = end_msc_irq,
1da177e4 LT	116	};
1da177e4 LT	117
94dee171	118	struct irq_chip msc_edgeirq_type = {
70d21cde	119	.name = "SOC-it-Edge",
8ab00b9a	120	.ack = edge_mask_and_ack_msc_irq,
1603b5ac AN	121	.mask = mask_msc_irq,
	122	.mask_ack = edge_mask_and_ack_msc_irq,
	123	.unmask = unmask_msc_irq,
1417836e	124	.eoi = unmask_msc_irq,
8ab00b9a	125	.end = end_msc_irq,
1da177e4 LT	126	};
	127
	128
d725cf38	129	void __init init_msc_irqs(unsigned long icubase, unsigned int irqbase, msc_irqmap_t *imp, int nirq)
1da177e4 LT	130	{
	131	extern void (*board_bind_eic_interrupt)(unsigned int irq, unsigned int regset);
	132
d725cf38	133	_icctrl_msc = (unsigned long) ioremap (icubase, 0x40000);
1da177e4 LT	134
	135	/* Reset interrupt controller - initialises all registers to 0 */
	136	MSCIC_WRITE(MSC01_IC_RST, MSC01_IC_RST_RST_BIT);
	137
	138	board_bind_eic_interrupt = &msc_bind_eic_interrupt;
	139
	140	for (; nirq >= 0; nirq--, imp++) {
	141	int n = imp->im_irq;
	142
	143	switch (imp->im_type) {
	144	case MSC01_IRQ_EDGE:
d725cf38	145	set_irq_chip(irqbase+n, &msc_edgeirq_type);
e01402b1	146	if (cpu_has_veic)
1da177e4 LT	147	MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT);
	148	else
	149	MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT \| imp->im_lvl);
	150	break;
	151	case MSC01_IRQ_LEVEL:
d725cf38	152	set_irq_chip(irqbase+n, &msc_levelirq_type);
e01402b1	153	if (cpu_has_veic)
1da177e4 LT	154	MSCIC_WRITE(MSC01_IC_SUP+n*8, 0);
	155	else
	156	MSCIC_WRITE(MSC01_IC_SUP+n*8, imp->im_lvl);
	157	}
	158	}
	159
d725cf38	160	irq_base = irqbase;
1da177e4 LT	161
	162	MSCIC_WRITE(MSC01_IC_GENA, MSC01_IC_GENA_GENA_BIT); /* Enable interrupt generation */
	163
	164	}