[linux-2.6-block.git] / arch / mn10300 / unit-asb2364 / irq-fpga.c

/* ASB2364 FPGA interrupt multiplexing
 *
 * Copyright (C) 2010 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 Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */

#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <unit/fpga-regs.h>

/*
 * FPGA PIC operations
 */
static void asb2364_fpga_mask(struct irq_data *d)
{
	ASB2364_FPGA_REG_MASK(d->irq - NR_CPU_IRQS) = 0x0001;
	SyncExBus();
}

static void asb2364_fpga_ack(struct irq_data *d)
{
	ASB2364_FPGA_REG_IRQ(d->irq - NR_CPU_IRQS) = 0x0001;
	SyncExBus();
}

static void asb2364_fpga_mask_ack(struct irq_data *d)
{
	ASB2364_FPGA_REG_MASK(d->irq - NR_CPU_IRQS) = 0x0001;
	SyncExBus();
	ASB2364_FPGA_REG_IRQ(d->irq - NR_CPU_IRQS) = 0x0001;
	SyncExBus();
}

static void asb2364_fpga_unmask(struct irq_data *d)
{
	ASB2364_FPGA_REG_MASK(d->irq - NR_CPU_IRQS) = 0x0000;
	SyncExBus();
}

static struct irq_chip asb2364_fpga_pic = {
	.name		= "fpga",
	.irq_ack	= asb2364_fpga_ack,
	.irq_mask	= asb2364_fpga_mask,
	.irq_mask_ack	= asb2364_fpga_mask_ack,
	.irq_unmask	= asb2364_fpga_unmask,
};

/*
 * FPGA PIC interrupt handler
 */
static irqreturn_t fpga_interrupt(int irq, void *_mask)
{
	if ((ASB2364_FPGA_REG_IRQ_LAN  & 0x0001) != 0x0001)
		generic_handle_irq(FPGA_LAN_IRQ);
	if ((ASB2364_FPGA_REG_IRQ_UART & 0x0001) != 0x0001)
		generic_handle_irq(FPGA_UART_IRQ);
	if ((ASB2364_FPGA_REG_IRQ_I2C  & 0x0001) != 0x0001)
		generic_handle_irq(FPGA_I2C_IRQ);
	if ((ASB2364_FPGA_REG_IRQ_USB  & 0x0001) != 0x0001)
		generic_handle_irq(FPGA_USB_IRQ);
	if ((ASB2364_FPGA_REG_IRQ_FPGA & 0x0001) != 0x0001)
		generic_handle_irq(FPGA_FPGA_IRQ);

	return IRQ_HANDLED;
}

/*
 * Define an interrupt action for each FPGA PIC output
 */
static struct irqaction fpga_irq[]  = {
	[0] = {
		.handler	= fpga_interrupt,
		.flags		= IRQF_SHARED,
		.name		= "fpga",
	},
};

/*
 * Initialise the FPGA's PIC
 */
void __init irq_fpga_init(void)
{
	int irq;

	ASB2364_FPGA_REG_MASK_LAN  = 0x0001;
	SyncExBus();
	ASB2364_FPGA_REG_MASK_UART = 0x0001;
	SyncExBus();
	ASB2364_FPGA_REG_MASK_I2C  = 0x0001;
	SyncExBus();
	ASB2364_FPGA_REG_MASK_USB  = 0x0001;
	SyncExBus();
	ASB2364_FPGA_REG_MASK_FPGA = 0x0001;
	SyncExBus();

	for (irq = NR_CPU_IRQS; irq < NR_IRQS; irq++)
		irq_set_chip_and_handler(irq, &asb2364_fpga_pic,
					 handle_level_irq);

	/* the FPGA drives the XIRQ1 input on the CPU PIC */
	setup_irq(XIRQ1, &fpga_irq[0]);
}
Commit	Line	Data
6044cf1d DH	1	/* ASB2364 FPGA interrupt multiplexing
	2	*
	3	* Copyright (C) 2010 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 Licence
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the Licence, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/interrupt.h>
	13	#include <linux/init.h>
	14	#include <linux/irq.h>
	15	#include <unit/fpga-regs.h>
	16
	17	/*
	18	* FPGA PIC operations
	19	*/
1ddc4a38	20	static void asb2364_fpga_mask(struct irq_data *d)
6044cf1d	21	{
1ddc4a38	22	ASB2364_FPGA_REG_MASK(d->irq - NR_CPU_IRQS) = 0x0001;
6044cf1d DH	23	SyncExBus();
	24	}
	25
1ddc4a38	26	static void asb2364_fpga_ack(struct irq_data *d)
6044cf1d	27	{
1ddc4a38	28	ASB2364_FPGA_REG_IRQ(d->irq - NR_CPU_IRQS) = 0x0001;
6044cf1d DH	29	SyncExBus();
	30	}
	31
1ddc4a38	32	static void asb2364_fpga_mask_ack(struct irq_data *d)
6044cf1d	33	{
1ddc4a38	34	ASB2364_FPGA_REG_MASK(d->irq - NR_CPU_IRQS) = 0x0001;
6044cf1d	35	SyncExBus();
1ddc4a38	36	ASB2364_FPGA_REG_IRQ(d->irq - NR_CPU_IRQS) = 0x0001;
6044cf1d DH	37	SyncExBus();
	38	}
	39
1ddc4a38	40	static void asb2364_fpga_unmask(struct irq_data *d)
6044cf1d	41	{
1ddc4a38	42	ASB2364_FPGA_REG_MASK(d->irq - NR_CPU_IRQS) = 0x0000;
6044cf1d DH	43	SyncExBus();
	44	}
	45
	46	static struct irq_chip asb2364_fpga_pic = {
	47	.name = "fpga",
1ddc4a38 TG	48	.irq_ack = asb2364_fpga_ack,
	49	.irq_mask = asb2364_fpga_mask,
	50	.irq_mask_ack = asb2364_fpga_mask_ack,
	51	.irq_unmask = asb2364_fpga_unmask,
6044cf1d DH	52	};
	53
	54	/*
	55	* FPGA PIC interrupt handler
	56	*/
	57	static irqreturn_t fpga_interrupt(int irq, void *_mask)
	58	{
	59	if ((ASB2364_FPGA_REG_IRQ_LAN & 0x0001) != 0x0001)
	60	generic_handle_irq(FPGA_LAN_IRQ);
	61	if ((ASB2364_FPGA_REG_IRQ_UART & 0x0001) != 0x0001)
	62	generic_handle_irq(FPGA_UART_IRQ);
	63	if ((ASB2364_FPGA_REG_IRQ_I2C & 0x0001) != 0x0001)
	64	generic_handle_irq(FPGA_I2C_IRQ);
	65	if ((ASB2364_FPGA_REG_IRQ_USB & 0x0001) != 0x0001)
	66	generic_handle_irq(FPGA_USB_IRQ);
	67	if ((ASB2364_FPGA_REG_IRQ_FPGA & 0x0001) != 0x0001)
	68	generic_handle_irq(FPGA_FPGA_IRQ);
	69
	70	return IRQ_HANDLED;
	71	}
	72
	73	/*
	74	* Define an interrupt action for each FPGA PIC output
	75	*/
	76	static struct irqaction fpga_irq[] = {
	77	[0] = {
	78	.handler = fpga_interrupt,
322a126a	79	.flags = IRQF_SHARED,
6044cf1d DH	80	.name = "fpga",
	81	},
	82	};
	83
	84	/*
	85	* Initialise the FPGA's PIC
	86	*/
	87	void __init irq_fpga_init(void)
	88	{
	89	int irq;
	90
ddb7d1e9 DH	91	ASB2364_FPGA_REG_MASK_LAN = 0x0001;
	92	SyncExBus();
	93	ASB2364_FPGA_REG_MASK_UART = 0x0001;
	94	SyncExBus();
	95	ASB2364_FPGA_REG_MASK_I2C = 0x0001;
	96	SyncExBus();
	97	ASB2364_FPGA_REG_MASK_USB = 0x0001;
	98	SyncExBus();
	99	ASB2364_FPGA_REG_MASK_FPGA = 0x0001;
	100	SyncExBus();
	101
6044cf1d	102	for (irq = NR_CPU_IRQS; irq < NR_IRQS; irq++)
f4c547eb TG	103	irq_set_chip_and_handler(irq, &asb2364_fpga_pic,
f4c547eb TG	104	handle_level_irq);
6044cf1d DH	105
	106	/* the FPGA drives the XIRQ1 input on the CPU PIC */
	107	setup_irq(XIRQ1, &fpga_irq[0]);
	108	}