[mirror_ubuntu-artful-kernel.git] / arch / frv / kernel / irq-mb93091.c

/* irq-mb93091.c: MB93091 FPGA interrupt handling
 *
 * Copyright (C) 2003 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 <asm/io.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/delay.h>
#include <asm/irq.h>
#include <asm/irc-regs.h>

#define __reg16(ADDR) (*(volatile unsigned short *)(ADDR))

#define __get_IMR()	({ __reg16(0xffc00004); })
#define __set_IMR(M)	do { __reg16(0xffc00004) = (M); wmb(); } while(0)
#define __get_IFR()	({ __reg16(0xffc0000c); })
#define __clr_IFR(M)	do { __reg16(0xffc0000c) = ~(M); wmb(); } while(0)


/*
 * on-motherboard FPGA PIC operations
 */
static void frv_fpga_enable(unsigned int irq)
{
	uint16_t imr = __get_IMR();

	imr &= ~(1 << (irq - IRQ_BASE_FPGA));

	__set_IMR(imr);
}

static void frv_fpga_disable(unsigned int irq)
{
	uint16_t imr = __get_IMR();

	imr |= 1 << (irq - IRQ_BASE_FPGA);

	__set_IMR(imr);
}

static void frv_fpga_ack(unsigned int irq)
{
	__clr_IFR(1 << (irq - IRQ_BASE_FPGA));
}

static void frv_fpga_end(unsigned int irq)
{
}

static struct irq_chip frv_fpga_pic = {
	.name		= "mb93091",
	.enable		= frv_fpga_enable,
	.disable	= frv_fpga_disable,
	.ack		= frv_fpga_ack,
	.mask		= frv_fpga_disable,
	.unmask		= frv_fpga_enable,
	.end		= frv_fpga_end,
};

/*
 * FPGA PIC interrupt handler
 */
static irqreturn_t fpga_interrupt(int irq, void *_mask, struct pt_regs *regs)
{
	uint16_t imr, mask = (unsigned long) _mask;
	irqreturn_t iret = 0;

	imr = __get_IMR();
	mask = mask & ~imr & __get_IFR();

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

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

		if (__do_IRQ(IRQ_BASE_FPGA + irq, regs))
			iret |= IRQ_HANDLED;
	}

	return iret;
}

/*
 * define an interrupt action for each FPGA PIC output
 * - use dev_id to indicate the FPGA PIC input to output mappings
 */
static struct irqaction fpga_irq[4]  = {
	[0] = {
		.handler	= fpga_interrupt,
		.flags		= IRQF_DISABLED | IRQF_SHARED,
		.mask		= CPU_MASK_NONE,
		.name		= "fpga.0",
		.dev_id		= (void *) 0x0028UL,
	},
	[1] = {
		.handler	= fpga_interrupt,
		.flags		= IRQF_DISABLED | IRQF_SHARED,
		.mask		= CPU_MASK_NONE,
		.name		= "fpga.1",
		.dev_id		= (void *) 0x0050UL,
	},
	[2] = {
		.handler	= fpga_interrupt,
		.flags		= IRQF_DISABLED | IRQF_SHARED,
		.mask		= CPU_MASK_NONE,
		.name		= "fpga.2",
		.dev_id		= (void *) 0x1c00UL,
	},
	[3] = {
		.handler	= fpga_interrupt,
		.flags		= IRQF_DISABLED | IRQF_SHARED,
		.mask		= CPU_MASK_NONE,
		.name		= "fpga.3",
		.dev_id		= (void *) 0x6386UL,
	}
};

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

	/* all PIC inputs are all set to be low-level driven, apart from the
	 * NMI button (15) which is fixed at falling-edge
	 */
	__set_IMR(0x7ffe);
	__clr_IFR(0x0000);

	for (irq = IRQ_BASE_FPGA + 1; irq <= IRQ_BASE_FPGA + 14; irq++)
		set_irq_chip_and_handler(irq, &frv_fpga_pic, handle_level_irq);

	set_irq_chip_and_handler(IRQ_FPGA_NMI, &frv_fpga_pic, handle_edge_irq);

	/* the FPGA drives the first four external IRQ inputs on the CPU PIC */
	setup_irq(IRQ_CPU_EXTERNAL0, &fpga_irq[0]);
	setup_irq(IRQ_CPU_EXTERNAL1, &fpga_irq[1]);
	setup_irq(IRQ_CPU_EXTERNAL2, &fpga_irq[2]);
	setup_irq(IRQ_CPU_EXTERNAL3, &fpga_irq[3]);
}
Commit	Line	Data
1da177e4 LT	1	/* irq-mb93091.c: MB93091 FPGA interrupt handling
	2	*
	3	* Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
	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>
	20
	21	#include <asm/io.h>
	22	#include <asm/system.h>
	23	#include <asm/bitops.h>
	24	#include <asm/delay.h>
	25	#include <asm/irq.h>
	26	#include <asm/irc-regs.h>
1da177e4 LT	27
	28	#define __reg16(ADDR) ((volatile unsigned short )(ADDR))
	29
	30	#define __get_IMR() ({ __reg16(0xffc00004); })
	31	#define __set_IMR(M) do { __reg16(0xffc00004) = (M); wmb(); } while(0)
	32	#define __get_IFR() ({ __reg16(0xffc0000c); })
	33	#define __clr_IFR(M) do { __reg16(0xffc0000c) = ~(M); wmb(); } while(0)
	34
1da177e4	35
1da177e4	36	/*
1bcbba30	37	* on-motherboard FPGA PIC operations
1da177e4	38	*/
1bcbba30 DH	39	static void frv_fpga_enable(unsigned int irq)
	40	{
	41	uint16_t imr = __get_IMR();
1da177e4	42
1bcbba30	43	imr &= ~(1 << (irq - IRQ_BASE_FPGA));
1da177e4	44
1bcbba30 DH	45	__set_IMR(imr);
1bcbba30 DH	46	}
1da177e4	47
1bcbba30	48	static void frv_fpga_disable(unsigned int irq)
1da177e4 LT	49	{
	50	uint16_t imr = __get_IMR();
	51
1bcbba30	52	imr \|= 1 << (irq - IRQ_BASE_FPGA);
1da177e4 LT	53
	54	__set_IMR(imr);
	55	}
	56
1bcbba30 DH	57	static void frv_fpga_ack(unsigned int irq)
	58	{
	59	__clr_IFR(1 << (irq - IRQ_BASE_FPGA));
	60	}
	61
	62	static void frv_fpga_end(unsigned int irq)
	63	{
	64	}
	65
	66	static struct irq_chip frv_fpga_pic = {
	67	.name = "mb93091",
	68	.enable = frv_fpga_enable,
	69	.disable = frv_fpga_disable,
	70	.ack = frv_fpga_ack,
	71	.mask = frv_fpga_disable,
	72	.unmask = frv_fpga_enable,
	73	.end = frv_fpga_end,
	74	};
	75
	76	/*
	77	* FPGA PIC interrupt handler
	78	*/
	79	static irqreturn_t fpga_interrupt(int irq, void _mask, struct pt_regs regs)
1da177e4	80	{
1bcbba30 DH	81	uint16_t imr, mask = (unsigned long) _mask;
1bcbba30 DH	82	irqreturn_t iret = 0;
1da177e4 LT	83
1da177e4 LT	84	imr = __get_IMR();
1bcbba30 DH	85	mask = mask & ~imr & __get_IFR();
	86
	87	/* poll all the triggered IRQs */
	88	while (mask) {
	89	int irq;
	90
	91	asm("scan %1,gr0,%0" : "=r"(irq) : "r"(mask));
	92	irq = 31 - irq;
	93	mask &= ~(1 << irq);
	94
	95	if (__do_IRQ(IRQ_BASE_FPGA + irq, regs))
	96	iret \|= IRQ_HANDLED;
1da177e4	97	}
1bcbba30 DH	98
1bcbba30 DH	99	return iret;
1da177e4 LT	100	}
1da177e4 LT	101
1bcbba30 DH	102	/*
	103	* define an interrupt action for each FPGA PIC output
	104	* - use dev_id to indicate the FPGA PIC input to output mappings
	105	*/
	106	static struct irqaction fpga_irq[4] = {
	107	[0] = {
	108	.handler = fpga_interrupt,
	109	.flags = IRQF_DISABLED \| IRQF_SHARED,
	110	.mask = CPU_MASK_NONE,
	111	.name = "fpga.0",
	112	.dev_id = (void *) 0x0028UL,
	113	},
	114	[1] = {
	115	.handler = fpga_interrupt,
	116	.flags = IRQF_DISABLED \| IRQF_SHARED,
	117	.mask = CPU_MASK_NONE,
	118	.name = "fpga.1",
	119	.dev_id = (void *) 0x0050UL,
	120	},
	121	[2] = {
	122	.handler = fpga_interrupt,
	123	.flags = IRQF_DISABLED \| IRQF_SHARED,
	124	.mask = CPU_MASK_NONE,
	125	.name = "fpga.2",
	126	.dev_id = (void *) 0x1c00UL,
	127	},
	128	[3] = {
	129	.handler = fpga_interrupt,
	130	.flags = IRQF_DISABLED \| IRQF_SHARED,
	131	.mask = CPU_MASK_NONE,
	132	.name = "fpga.3",
	133	.dev_id = (void *) 0x6386UL,
	134	}
	135	};
	136
	137	/*
	138	* initialise the motherboard FPGA's PIC
	139	*/
1da177e4 LT	140	void __init fpga_init(void)
1da177e4 LT	141	{
1bcbba30 DH	142	int irq;
	143
	144	/* all PIC inputs are all set to be low-level driven, apart from the
	145	* NMI button (15) which is fixed at falling-edge
	146	*/
1da177e4 LT	147	__set_IMR(0x7ffe);
	148	__clr_IFR(0x0000);
	149
1bcbba30 DH	150	for (irq = IRQ_BASE_FPGA + 1; irq <= IRQ_BASE_FPGA + 14; irq++)
	151	set_irq_chip_and_handler(irq, &frv_fpga_pic, handle_level_irq);
	152
	153	set_irq_chip_and_handler(IRQ_FPGA_NMI, &frv_fpga_pic, handle_edge_irq);
	154
	155	/* the FPGA drives the first four external IRQ inputs on the CPU PIC */
	156	setup_irq(IRQ_CPU_EXTERNAL0, &fpga_irq[0]);
	157	setup_irq(IRQ_CPU_EXTERNAL1, &fpga_irq[1]);
	158	setup_irq(IRQ_CPU_EXTERNAL2, &fpga_irq[2]);
	159	setup_irq(IRQ_CPU_EXTERNAL3, &fpga_irq[3]);
1da177e4	160	}