[deliverable/linux.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)
			m68k_handle_int(mach_irq);
	}
	return IRQ_HANDLED;
}

static void cia_enable_irq(unsigned int 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_disable_irq(unsigned int 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_controller cia_irq_controller = {
	.name		= "cia",
	.lock		= __SPIN_LOCK_UNLOCKED(cia_irq_controller.lock),
	.enable		= cia_enable_irq,
	.disable	= cia_disable_irq,
};

/*
 * 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_enable_irq(unsigned int irq)
{
	switch (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_disable_irq(unsigned int irq)
{
	switch (irq) {
	case IRQ_AUTO_2:
		amiga_custom.intena = IF_PORTS;
		break;
	case IRQ_AUTO_6:
		amiga_custom.intena = IF_EXTER;
		break;
	}
}

static struct irq_controller auto_irq_controller = {
	.name		= "auto",
	.lock		= __SPIN_LOCK_UNLOCKED(auto_irq_controller.lock),
	.enable		= auto_enable_irq,
	.disable	= auto_disable_irq,
};

void __init cia_init_IRQ(struct ciabase *base)
{
	m68k_setup_irq_controller(&cia_irq_controller, 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_controller, base->handler_irq, 1);
	m68k_irq_startup(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)
2850bc27	96	m68k_handle_int(mach_irq);
1da177e4	97	}
1da177e4 LT	98	return IRQ_HANDLED;
	99	}
	100
74be8d08	101	static void cia_enable_irq(unsigned int irq)
1da177e4	102	{
74be8d08	103	unsigned char mask;
1da177e4	104
74be8d08 RZ	105	if (irq >= IRQ_AMIGA_CIAB) {
	106	mask = 1 << (irq - IRQ_AMIGA_CIAB);
	107	cia_set_irq(&ciab_base, mask);
	108	cia_able_irq(&ciab_base, CIA_ICR_SETCLR \| mask);
	109	} else {
	110	mask = 1 << (irq - IRQ_AMIGA_CIAA);
	111	cia_set_irq(&ciaa_base, mask);
	112	cia_able_irq(&ciaa_base, CIA_ICR_SETCLR \| mask);
1da177e4	113	}
74be8d08	114	}
1da177e4	115
74be8d08 RZ	116	static void cia_disable_irq(unsigned int irq)
	117	{
	118	if (irq >= IRQ_AMIGA_CIAB)
	119	cia_able_irq(&ciab_base, 1 << (irq - IRQ_AMIGA_CIAB));
	120	else
	121	cia_able_irq(&ciaa_base, 1 << (irq - IRQ_AMIGA_CIAA));
	122	}
1da177e4	123
74be8d08 RZ	124	static struct irq_controller cia_irq_controller = {
74be8d08 RZ	125	.name = "cia",
241258d1	126	.lock = __SPIN_LOCK_UNLOCKED(cia_irq_controller.lock),
74be8d08 RZ	127	.enable = cia_enable_irq,
	128	.disable = cia_disable_irq,
	129	};
	130
	131	/*
	132	* Override auto irq 2 & 6 and use them as general chain
	133	* for external interrupts, we link the CIA interrupt sources
	134	* into this chain.
	135	*/
1da177e4	136
74be8d08 RZ	137	static void auto_enable_irq(unsigned int irq)
	138	{
	139	switch (irq) {
	140	case IRQ_AUTO_2:
	141	amiga_custom.intena = IF_SETCLR \| IF_PORTS;
	142	break;
	143	case IRQ_AUTO_6:
	144	amiga_custom.intena = IF_SETCLR \| IF_EXTER;
	145	break;
	146	}
1da177e4 LT	147	}
1da177e4 LT	148
74be8d08	149	static void auto_disable_irq(unsigned int irq)
1da177e4	150	{
74be8d08 RZ	151	switch (irq) {
	152	case IRQ_AUTO_2:
	153	amiga_custom.intena = IF_PORTS;
	154	break;
	155	case IRQ_AUTO_6:
	156	amiga_custom.intena = IF_EXTER;
	157	break;
1da177e4	158	}
74be8d08 RZ	159	}
	160
	161	static struct irq_controller auto_irq_controller = {
	162	.name = "auto",
241258d1	163	.lock = __SPIN_LOCK_UNLOCKED(auto_irq_controller.lock),
74be8d08 RZ	164	.enable = auto_enable_irq,
	165	.disable = auto_disable_irq,
	166	};
	167
	168	void __init cia_init_IRQ(struct ciabase *base)
	169	{
	170	m68k_setup_irq_controller(&cia_irq_controller, base->cia_irq, CIA_IRQS);
	171
	172	/* clear any pending interrupt and turn off all interrupts */
	173	cia_set_irq(base, CIA_ICR_ALL);
	174	cia_able_irq(base, CIA_ICR_ALL);
	175
	176	/* override auto int and install CIA handler */
	177	m68k_setup_irq_controller(&auto_irq_controller, base->handler_irq, 1);
	178	m68k_irq_startup(base->handler_irq);
66acd258 GU	179	if (request_irq(base->handler_irq, cia_handler, IRQF_SHARED,
	180	base->name, base))
	181	pr_err("Couldn't register %s interrupt\n", base->name);
1da177e4	182	}