[mirror_ubuntu-focal-kernel.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/mm.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/ide.h>

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

/* #define DEBUG_BABOON */
/* #define DEBUG_IRQS */

int baboon_present,baboon_active;
volatile struct baboon *baboon;

irqreturn_t baboon_irq(int, void *);

#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;
	baboon_active = 0;

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

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

void __init baboon_register_interrupts(void)
{
	request_irq(IRQ_NUBUS_C, baboon_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST,
		    "baboon", (void *) baboon);
}

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

irqreturn_t baboon_irq(int irq, void *dev_id)
{
	int irq_bit, irq_num;
	unsigned char events;

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

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

	irq_num = IRQ_BABOON_0;
	irq_bit = 1;
	do {
	        if (events & irq_bit/* & baboon_active*/) {
			baboon_active &= ~irq_bit;
			baboon->mb_ifr &= ~irq_bit;
			m68k_handle_int(irq_num);
			baboon_active |= irq_bit;
		}
		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
	return IRQ_HANDLED;
}

void baboon_irq_enable(int irq) {
	int irq_idx	= IRQ_IDX(irq);

#ifdef DEBUG_IRQUSE
	printk("baboon_irq_enable(%d)\n", irq);
#endif
	baboon_active |= (1 << irq_idx);
}

void baboon_irq_disable(int irq) {
	int irq_idx	= IRQ_IDX(irq);

#ifdef DEBUG_IRQUSE
	printk("baboon_irq_disable(%d)\n", irq);
#endif
	baboon_active &= ~(1 << irq_idx);
}

void baboon_irq_clear(int irq) {
	int irq_idx	= IRQ_IDX(irq);

	baboon->mb_ifr &= ~(1 << irq_idx);
}

int baboon_irq_pending(int irq)
{
	int irq_idx	= IRQ_IDX(irq);

	return baboon->mb_ifr & (1 << irq_idx);
}
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>
	11	#include <linux/mm.h>
	12	#include <linux/delay.h>
	13	#include <linux/init.h>
	14	#include <linux/ide.h>
	15
	16	#include <asm/traps.h>
	17	#include <asm/bootinfo.h>
	18	#include <asm/macintosh.h>
	19	#include <asm/macints.h>
	20	#include <asm/mac_baboon.h>
	21
	22	/* #define DEBUG_BABOON */
	23	/* #define DEBUG_IRQS */
	24
	25	int baboon_present,baboon_active;
	26	volatile struct baboon *baboon;
	27
2850bc27	28	irqreturn_t baboon_irq(int, void *);
1da177e4 LT	29
	30	#if 0
	31	extern int macide_ack_intr(struct ata_channel *);
	32	#endif
	33
	34	/*
	35	* Baboon initialization.
	36	*/
	37
	38	void __init baboon_init(void)
	39	{
	40	if (macintosh_config->ident != MAC_MODEL_PB190) {
	41	baboon = NULL;
	42	baboon_present = 0;
	43	return;
	44	}
	45
	46	baboon = (struct baboon *) BABOON_BASE;
	47	baboon_present = 1;
	48	baboon_active = 0;
	49
	50	printk("Baboon detected at %p\n", baboon);
	51	}
	52
	53	/*
	54	* Register the Baboon interrupt dispatcher on nubus slot $C.
	55	*/
	56
	57	void __init baboon_register_interrupts(void)
	58	{
	59	request_irq(IRQ_NUBUS_C, baboon_irq, IRQ_FLG_LOCK\|IRQ_FLG_FAST,
	60	"baboon", (void *) baboon);
	61	}
	62
	63	/*
	64	* Baboon interrupt handler. This works a lot like a VIA.
	65	*/
	66
2850bc27	67	irqreturn_t baboon_irq(int irq, void *dev_id)
1da177e4	68	{
67dfb153	69	int irq_bit, irq_num;
1da177e4 LT	70	unsigned char events;
	71
	72	#ifdef DEBUG_IRQS
	73	printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X active %02X\n",
	74	(uint) baboon->mb_control, (uint) baboon->mb_ifr,
	75	(uint) baboon->mb_status, baboon_active);
	76	#endif
	77
	78	if (!(events = baboon->mb_ifr & 0x07))
	79	return IRQ_NONE;
	80
67dfb153 FT	81	irq_num = IRQ_BABOON_0;
	82	irq_bit = 1;
	83	do {
1da177e4 LT	84	if (events & irq_bit/* & baboon_active*/) {
1da177e4 LT	85	baboon_active &= ~irq_bit;
647b804c	86	baboon->mb_ifr &= ~irq_bit;
67dfb153	87	m68k_handle_int(irq_num);
1da177e4	88	baboon_active \|= irq_bit;
1da177e4	89	}
67dfb153 FT	90	irq_bit <<= 1;
	91	irq_num++;
	92	} while(events >= irq_bit);
1da177e4 LT	93	#if 0
	94	if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
	95	/* for now we need to smash all interrupts */
	96	baboon->mb_ifr &= ~events;
	97	#endif
	98	return IRQ_HANDLED;
	99	}
	100
	101	void baboon_irq_enable(int irq) {
	102	int irq_idx = IRQ_IDX(irq);
	103
	104	#ifdef DEBUG_IRQUSE
	105	printk("baboon_irq_enable(%d)\n", irq);
	106	#endif
	107	baboon_active \|= (1 << irq_idx);
	108	}
	109
	110	void baboon_irq_disable(int irq) {
	111	int irq_idx = IRQ_IDX(irq);
	112
	113	#ifdef DEBUG_IRQUSE
	114	printk("baboon_irq_disable(%d)\n", irq);
	115	#endif
	116	baboon_active &= ~(1 << irq_idx);
	117	}
	118
	119	void baboon_irq_clear(int irq) {
	120	int irq_idx = IRQ_IDX(irq);
	121
	122	baboon->mb_ifr &= ~(1 << irq_idx);
	123	}
	124
	125	int baboon_irq_pending(int irq)
	126	{
	127	int irq_idx = IRQ_IDX(irq);
	128
	129	return baboon->mb_ifr & (1 << irq_idx);
	130	}