[deliverable/linux.git] / arch / m68k / mac / baboon.c

/*
 * Baboon Custom IC Management
 *
 * The Baboon custom IC controls the IDE, PCMCIA and media bay on the
 * PowerBook 190. It multiplexes multiple interrupt sources onto the
 * Nubus slot $C interrupt.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/irq.h>

#include <asm/macintosh.h>
#include <asm/macints.h>
#include <asm/mac_baboon.h>

/* #define DEBUG_IRQS */

int baboon_present;
static volatile struct baboon *baboon;

#if 0
extern int macide_ack_intr(struct ata_channel *);
#endif

/*
 * Baboon initialization.
 */

void __init baboon_init(void)
{
	if (macintosh_config->ident != MAC_MODEL_PB190) {
		baboon = NULL;
		baboon_present = 0;
		return;
	}

	baboon = (struct baboon *) BABOON_BASE;
	baboon_present = 1;

	printk("Baboon detected at %p\n", baboon);
}

/*
 * Baboon interrupt handler. This works a lot like a VIA.
 */

static void baboon_irq(struct irq_desc *desc)
{
	int irq_bit, irq_num;
	unsigned char events;

#ifdef DEBUG_IRQS
	printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X\n",
		(uint) baboon->mb_control, (uint) baboon->mb_ifr,
		(uint) baboon->mb_status);
#endif

	events = baboon->mb_ifr & 0x07;
	if (!events)
		return;

	irq_num = IRQ_BABOON_0;
	irq_bit = 1;
	do {
	        if (events & irq_bit) {
			baboon->mb_ifr &= ~irq_bit;
			generic_handle_irq(irq_num);
		}
		irq_bit <<= 1;
		irq_num++;
	} while(events >= irq_bit);
#if 0
	if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
	/* for now we need to smash all interrupts */
	baboon->mb_ifr &= ~events;
#endif
}

/*
 * Register the Baboon interrupt dispatcher on nubus slot $C.
 */

void __init baboon_register_interrupts(void)
{
	irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq);
}

/*
 * The means for masking individual Baboon interrupts remains a mystery.
 * However, since we only use the IDE IRQ, we can just enable/disable all
 * Baboon interrupts. If/when we handle more than one Baboon IRQ, we must
 * either figure out how to mask them individually or else implement the
 * same workaround that's used for NuBus slots (see nubus_disabled and
 * via_nubus_irq_shutdown).
 */

void baboon_irq_enable(int irq)
{
#ifdef DEBUG_IRQUSE
	printk("baboon_irq_enable(%d)\n", irq);
#endif

	mac_irq_enable(irq_get_irq_data(IRQ_NUBUS_C));
}

void baboon_irq_disable(int irq)
{
#ifdef DEBUG_IRQUSE
	printk("baboon_irq_disable(%d)\n", irq);
#endif

	mac_irq_disable(irq_get_irq_data(IRQ_NUBUS_C));
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Baboon Custom IC Management
	3	*
	4	* The Baboon custom IC controls the IDE, PCMCIA and media bay on the
	5	* PowerBook 190. It multiplexes multiple interrupt sources onto the
	6	* Nubus slot $C interrupt.
	7	*/
	8
	9	#include <linux/types.h>
	10	#include <linux/kernel.h>
ddc7fd25	11	#include <linux/irq.h>
1da177e4	12
1da177e4 LT	13	#include <asm/macintosh.h>
	14	#include <asm/macints.h>
	15	#include <asm/mac_baboon.h>
	16
1da177e4 LT	17	/* #define DEBUG_IRQS */
1da177e4 LT	18
217f6710	19	int baboon_present;
8dfbdf4a	20	static volatile struct baboon *baboon;
1da177e4 LT	21
	22	#if 0
	23	extern int macide_ack_intr(struct ata_channel *);
	24	#endif
	25
	26	/*
	27	* Baboon initialization.
	28	*/
	29
	30	void __init baboon_init(void)
	31	{
	32	if (macintosh_config->ident != MAC_MODEL_PB190) {
	33	baboon = NULL;
	34	baboon_present = 0;
	35	return;
	36	}
	37
	38	baboon = (struct baboon *) BABOON_BASE;
	39	baboon_present = 1;
1da177e4 LT	40
	41	printk("Baboon detected at %p\n", baboon);
	42	}
	43
1da177e4 LT	44	/*
	45	* Baboon interrupt handler. This works a lot like a VIA.
	46	*/
	47
bd0b9ac4	48	static void baboon_irq(struct irq_desc *desc)
9145db56 GU	49	{
	50	int irq_bit, irq_num;
	51	unsigned char events;
	52
	53	#ifdef DEBUG_IRQS
	54	printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X\n",
	55	(uint) baboon->mb_control, (uint) baboon->mb_ifr,
	56	(uint) baboon->mb_status);
	57	#endif
	58
	59	events = baboon->mb_ifr & 0x07;
	60	if (!events)
	61	return;
	62
	63	irq_num = IRQ_BABOON_0;
	64	irq_bit = 1;
	65	do {
	66	if (events & irq_bit) {
	67	baboon->mb_ifr &= ~irq_bit;
	68	generic_handle_irq(irq_num);
	69	}
	70	irq_bit <<= 1;
	71	irq_num++;
	72	} while(events >= irq_bit);
	73	#if 0
	74	if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
	75	/* for now we need to smash all interrupts */
	76	baboon->mb_ifr &= ~events;
	77	#endif
	78	}
1da177e4	79
8dfbdf4a AB	80	/*
	81	* Register the Baboon interrupt dispatcher on nubus slot $C.
	82	*/
	83
	84	void __init baboon_register_interrupts(void)
	85	{
9145db56	86	irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq);
8dfbdf4a AB	87	}
8dfbdf4a AB	88
746e8d3b	89	/*
feb11e8a FT	90	* The means for masking individual Baboon interrupts remains a mystery.
	91	* However, since we only use the IDE IRQ, we can just enable/disable all
	92	* Baboon interrupts. If/when we handle more than one Baboon IRQ, we must
	93	* either figure out how to mask them individually or else implement the
	94	* same workaround that's used for NuBus slots (see nubus_disabled and
	95	* via_nubus_irq_shutdown).
746e8d3b FT	96	*/
	97
	98	void baboon_irq_enable(int irq)
	99	{
1da177e4 LT	100	#ifdef DEBUG_IRQUSE
	101	printk("baboon_irq_enable(%d)\n", irq);
	102	#endif
746e8d3b	103
feb11e8a	104	mac_irq_enable(irq_get_irq_data(IRQ_NUBUS_C));
1da177e4 LT	105	}
1da177e4 LT	106
746e8d3b FT	107	void baboon_irq_disable(int irq)
746e8d3b FT	108	{
1da177e4 LT	109	#ifdef DEBUG_IRQUSE
	110	printk("baboon_irq_disable(%d)\n", irq);
	111	#endif
746e8d3b	112
feb11e8a	113	mac_irq_disable(irq_get_irq_data(IRQ_NUBUS_C));
1da177e4	114	}