[linux-2.6-block.git] / arch / m68k / amiga / cia.c

/*
 *  linux/arch/m68k/amiga/cia.c - CIA support
 *
 *  Copyright (C) 1996 Roman Zippel
 *
 *  The concept of some functions bases on the original Amiga OS function
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>

#include <asm/irq.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>

struct ciabase {
	volatile struct CIA *cia;
	unsigned char icr_mask, icr_data;
	unsigned short int_mask;
	int handler_irq, cia_irq, server_irq;
	char *name;
} ciaa_base = {
	.cia		= &ciaa,
	.int_mask	= IF_PORTS,
	.handler_irq	= IRQ_AMIGA_PORTS,
	.cia_irq	= IRQ_AMIGA_CIAA,
	.name		= "CIAA"
}, ciab_base = {
	.cia		= &ciab,
	.int_mask	= IF_EXTER,
	.handler_irq	= IRQ_AMIGA_EXTER,
	.cia_irq	= IRQ_AMIGA_CIAB,
	.name		= "CIAB"
};

/*
 *  Cause or clear CIA interrupts, return old interrupt status.
 */

unsigned char cia_set_irq(struct ciabase *base, unsigned char mask)
{
	unsigned char old;

	old = (base->icr_data |= base->cia->icr);
	if (mask & CIA_ICR_SETCLR)
		base->icr_data |= mask;
	else
		base->icr_data &= ~mask;
	if (base->icr_data & base->icr_mask)
		amiga_custom.intreq = IF_SETCLR | base->int_mask;
	return old & base->icr_mask;
}

/*
 *  Enable or disable CIA interrupts, return old interrupt mask,
 */

unsigned char cia_able_irq(struct ciabase *base, unsigned char mask)
{
	unsigned char old;

	old = base->icr_mask;
	base->icr_data |= base->cia->icr;
	base->cia->icr = mask;
	if (mask & CIA_ICR_SETCLR)
		base->icr_mask |= mask;
	else
		base->icr_mask &= ~mask;
	base->icr_mask &= CIA_ICR_ALL;
	if (base->icr_data & base->icr_mask)
		amiga_custom.intreq = IF_SETCLR | base->int_mask;
	return old;
}

static irqreturn_t cia_handler(int irq, void *dev_id)
{
	struct ciabase *base = dev_id;
	int mach_irq;
	unsigned char ints;

	mach_irq = base->cia_irq;
	ints = cia_set_irq(base, CIA_ICR_ALL);
	amiga_custom.intreq = base->int_mask;
	for (; ints; mach_irq++, ints >>= 1) {
		if (ints & 1)
			generic_handle_irq(mach_irq);
	}
	return IRQ_HANDLED;
}

static void cia_irq_enable(struct irq_data *data)
{
	unsigned int irq = data->irq;
	unsigned char mask;

	if (irq >= IRQ_AMIGA_CIAB) {
		mask = 1 << (irq - IRQ_AMIGA_CIAB);
		cia_set_irq(&ciab_base, mask);
		cia_able_irq(&ciab_base, CIA_ICR_SETCLR | mask);
	} else {
		mask = 1 << (irq - IRQ_AMIGA_CIAA);
		cia_set_irq(&ciaa_base, mask);
		cia_able_irq(&ciaa_base, CIA_ICR_SETCLR | mask);
	}
}

static void cia_irq_disable(struct irq_data *data)
{
	unsigned int irq = data->irq;

	if (irq >= IRQ_AMIGA_CIAB)
		cia_able_irq(&ciab_base, 1 << (irq - IRQ_AMIGA_CIAB));
	else
		cia_able_irq(&ciaa_base, 1 << (irq - IRQ_AMIGA_CIAA));
}

static struct irq_chip cia_irq_chip = {
	.name		= "cia",
	.irq_enable	= cia_irq_enable,
	.irq_disable	= cia_irq_disable,
};

/*
 * Override auto irq 2 & 6 and use them as general chain
 * for external interrupts, we link the CIA interrupt sources
 * into this chain.
 */

static void auto_irq_enable(struct irq_data *data)
{
	switch (data->irq) {
	case IRQ_AUTO_2:
		amiga_custom.intena = IF_SETCLR | IF_PORTS;
		break;
	case IRQ_AUTO_6:
		amiga_custom.intena = IF_SETCLR | IF_EXTER;
		break;
	}
}

static void auto_irq_disable(struct irq_data *data)
{
	switch (data->irq) {
	case IRQ_AUTO_2:
		amiga_custom.intena = IF_PORTS;
		break;
	case IRQ_AUTO_6:
		amiga_custom.intena = IF_EXTER;
		break;
	}
}

static struct irq_chip auto_irq_chip = {
	.name		= "auto",
	.irq_enable	= auto_irq_enable,
	.irq_disable	= auto_irq_disable,
};

void __init cia_init_IRQ(struct ciabase *base)
{
	m68k_setup_irq_controller(&cia_irq_chip, handle_simple_irq,
				  base->cia_irq, CIA_IRQS);

	/* clear any pending interrupt and turn off all interrupts */
	cia_set_irq(base, CIA_ICR_ALL);
	cia_able_irq(base, CIA_ICR_ALL);

	/* override auto int and install CIA handler */
	m68k_setup_irq_controller(&auto_irq_chip, handle_simple_irq,
				  base->handler_irq, 1);
	m68k_irq_startup_irq(base->handler_irq);
	if (request_irq(base->handler_irq, cia_handler, IRQF_SHARED,
			base->name, base))
		pr_err("Couldn't register %s interrupt\n", base->name);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/m68k/amiga/cia.c - CIA support
	3	*
	4	* Copyright (C) 1996 Roman Zippel
	5	*
	6	* The concept of some functions bases on the original Amiga OS function
	7	*
	8	* This file is subject to the terms and conditions of the GNU General Public
	9	* License. See the file COPYING in the main directory of this archive
	10	* for more details.
	11	*/
	12
	13	#include <linux/types.h>
	14	#include <linux/kernel.h>
	15	#include <linux/sched.h>
	16	#include <linux/errno.h>
	17	#include <linux/kernel_stat.h>
	18	#include <linux/init.h>
	19	#include <linux/seq_file.h>
	20	#include <linux/interrupt.h>
	21
	22	#include <asm/irq.h>
	23	#include <asm/amigahw.h>
	24	#include <asm/amigaints.h>
	25
	26	struct ciabase {
	27	volatile struct CIA *cia;
	28	unsigned char icr_mask, icr_data;
	29	unsigned short int_mask;
	30	int handler_irq, cia_irq, server_irq;
	31	char *name;
1da177e4 LT	32	} ciaa_base = {
	33	.cia = &ciaa,
	34	.int_mask = IF_PORTS,
74be8d08	35	.handler_irq = IRQ_AMIGA_PORTS,
1da177e4	36	.cia_irq = IRQ_AMIGA_CIAA,
74be8d08	37	.name = "CIAA"
1da177e4 LT	38	}, ciab_base = {
	39	.cia = &ciab,
	40	.int_mask = IF_EXTER,
74be8d08	41	.handler_irq = IRQ_AMIGA_EXTER,
1da177e4	42	.cia_irq = IRQ_AMIGA_CIAB,
74be8d08	43	.name = "CIAB"
1da177e4 LT	44	};
	45
	46	/*
	47	* Cause or clear CIA interrupts, return old interrupt status.
	48	*/
	49
	50	unsigned char cia_set_irq(struct ciabase *base, unsigned char mask)
	51	{
	52	unsigned char old;
	53
	54	old = (base->icr_data \|= base->cia->icr);
	55	if (mask & CIA_ICR_SETCLR)
	56	base->icr_data \|= mask;
	57	else
	58	base->icr_data &= ~mask;
	59	if (base->icr_data & base->icr_mask)
b4290a23	60	amiga_custom.intreq = IF_SETCLR \| base->int_mask;
1da177e4 LT	61	return old & base->icr_mask;
	62	}
	63
	64	/*
	65	* Enable or disable CIA interrupts, return old interrupt mask,
1da177e4 LT	66	*/
	67
	68	unsigned char cia_able_irq(struct ciabase *base, unsigned char mask)
	69	{
74be8d08	70	unsigned char old;
1da177e4 LT	71
	72	old = base->icr_mask;
	73	base->icr_data \|= base->cia->icr;
	74	base->cia->icr = mask;
	75	if (mask & CIA_ICR_SETCLR)
	76	base->icr_mask \|= mask;
	77	else
	78	base->icr_mask &= ~mask;
	79	base->icr_mask &= CIA_ICR_ALL;
1da177e4	80	if (base->icr_data & base->icr_mask)
b4290a23	81	amiga_custom.intreq = IF_SETCLR \| base->int_mask;
1da177e4 LT	82	return old;
	83	}
	84
2850bc27	85	static irqreturn_t cia_handler(int irq, void *dev_id)
1da177e4	86	{
15aafa2f	87	struct ciabase *base = dev_id;
74be8d08	88	int mach_irq;
1da177e4 LT	89	unsigned char ints;
	90
	91	mach_irq = base->cia_irq;
1da177e4	92	ints = cia_set_irq(base, CIA_ICR_ALL);
b4290a23	93	amiga_custom.intreq = base->int_mask;
74be8d08 RZ	94	for (; ints; mach_irq++, ints >>= 1) {
74be8d08 RZ	95	if (ints & 1)
1425df87	96	generic_handle_irq(mach_irq);
1da177e4	97	}
1da177e4 LT	98	return IRQ_HANDLED;
	99	}
	100
e8abf5e7	101	static void cia_irq_enable(struct irq_data *data)
1da177e4	102	{
e8abf5e7	103	unsigned int irq = data->irq;
74be8d08	104	unsigned char mask;
1da177e4	105
74be8d08 RZ	106	if (irq >= IRQ_AMIGA_CIAB) {
	107	mask = 1 << (irq - IRQ_AMIGA_CIAB);
	108	cia_set_irq(&ciab_base, mask);
	109	cia_able_irq(&ciab_base, CIA_ICR_SETCLR \| mask);
	110	} else {
	111	mask = 1 << (irq - IRQ_AMIGA_CIAA);
	112	cia_set_irq(&ciaa_base, mask);
	113	cia_able_irq(&ciaa_base, CIA_ICR_SETCLR \| mask);
1da177e4	114	}
74be8d08	115	}
1da177e4	116
e8abf5e7	117	static void cia_irq_disable(struct irq_data *data)
74be8d08	118	{
e8abf5e7 GU	119	unsigned int irq = data->irq;
e8abf5e7 GU	120
74be8d08 RZ	121	if (irq >= IRQ_AMIGA_CIAB)
	122	cia_able_irq(&ciab_base, 1 << (irq - IRQ_AMIGA_CIAB));
	123	else
	124	cia_able_irq(&ciaa_base, 1 << (irq - IRQ_AMIGA_CIAA));
	125	}
1da177e4	126
c288bf25	127	static struct irq_chip cia_irq_chip = {
74be8d08	128	.name = "cia",
e8abf5e7 GU	129	.irq_enable = cia_irq_enable,
e8abf5e7 GU	130	.irq_disable = cia_irq_disable,
74be8d08 RZ	131	};
	132
	133	/*
	134	* Override auto irq 2 & 6 and use them as general chain
	135	* for external interrupts, we link the CIA interrupt sources
	136	* into this chain.
	137	*/
1da177e4	138
e8abf5e7	139	static void auto_irq_enable(struct irq_data *data)
74be8d08	140	{
e8abf5e7	141	switch (data->irq) {
74be8d08 RZ	142	case IRQ_AUTO_2:
	143	amiga_custom.intena = IF_SETCLR \| IF_PORTS;
	144	break;
	145	case IRQ_AUTO_6:
	146	amiga_custom.intena = IF_SETCLR \| IF_EXTER;
	147	break;
	148	}
1da177e4 LT	149	}
1da177e4 LT	150
e8abf5e7	151	static void auto_irq_disable(struct irq_data *data)
1da177e4	152	{
e8abf5e7	153	switch (data->irq) {
74be8d08 RZ	154	case IRQ_AUTO_2:
	155	amiga_custom.intena = IF_PORTS;
	156	break;
	157	case IRQ_AUTO_6:
	158	amiga_custom.intena = IF_EXTER;
	159	break;
1da177e4	160	}
74be8d08 RZ	161	}
74be8d08 RZ	162
c288bf25	163	static struct irq_chip auto_irq_chip = {
74be8d08	164	.name = "auto",
e8abf5e7 GU	165	.irq_enable = auto_irq_enable,
e8abf5e7 GU	166	.irq_disable = auto_irq_disable,
74be8d08 RZ	167	};
	168
	169	void __init cia_init_IRQ(struct ciabase *base)
	170	{
edb34725 GU	171	m68k_setup_irq_controller(&cia_irq_chip, handle_simple_irq,
edb34725 GU	172	base->cia_irq, CIA_IRQS);
74be8d08 RZ	173
	174	/* clear any pending interrupt and turn off all interrupts */
	175	cia_set_irq(base, CIA_ICR_ALL);
	176	cia_able_irq(base, CIA_ICR_ALL);
	177
	178	/* override auto int and install CIA handler */
edb34725 GU	179	m68k_setup_irq_controller(&auto_irq_chip, handle_simple_irq,
edb34725 GU	180	base->handler_irq, 1);
e8abf5e7	181	m68k_irq_startup_irq(base->handler_irq);
66acd258 GU	182	if (request_irq(base->handler_irq, cia_handler, IRQF_SHARED,
	183	base->name, base))
	184	pr_err("Couldn't register %s interrupt\n", base->name);
1da177e4	185	}