[linux-2.6-block.git] / arch / m68k / bvme6000 / config.c

/*
 *  arch/m68k/bvme6000/config.c
 *
 *  Copyright (C) 1997 Richard Hirst [richard@sleepie.demon.co.uk]
 *
 * Based on:
 *
 *  linux/amiga/config.c
 *
 *  Copyright (C) 1993 Hamish Macdonald
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file README.legal in the main directory of this archive
 * for more details.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/major.h>
#include <linux/genhd.h>
#include <linux/rtc.h>
#include <linux/interrupt.h>

#include <asm/bootinfo.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/setup.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/rtc.h>
#include <asm/machdep.h>
#include <asm/bvme6000hw.h>

static void bvme6000_get_model(char *model);
static int  bvme6000_get_hardware_list(char *buffer);
extern void bvme6000_sched_init(irq_handler_t handler);
extern unsigned long bvme6000_gettimeoffset (void);
extern int bvme6000_hwclk (int, struct rtc_time *);
extern int bvme6000_set_clock_mmss (unsigned long);
extern void bvme6000_reset (void);
extern void bvme6000_waitbut(void);
void bvme6000_set_vectors (void);

static unsigned char bcd2bin (unsigned char b);
static unsigned char bin2bcd (unsigned char b);

/* Save tick handler routine pointer, will point to do_timer() in
 * kernel/sched.c, called via bvme6000_process_int() */

static irq_handler_t tick_handler;


int bvme6000_parse_bootinfo(const struct bi_record *bi)
{
	if (bi->tag == BI_VME_TYPE)
		return 0;
	else
		return 1;
}

void bvme6000_reset(void)
{
	volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;

	printk ("\r\n\nCalled bvme6000_reset\r\n"
			"\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r");
	/* The string of returns is to delay the reset until the whole
	 * message is output. */
	/* Enable the watchdog, via PIT port C bit 4 */

	pit->pcddr	|= 0x10;	/* WDOG enable */

	while(1)
		;
}

static void bvme6000_get_model(char *model)
{
    sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4);
}


/* No hardware options on BVME6000? */

static int bvme6000_get_hardware_list(char *buffer)
{
    *buffer = '\0';
    return 0;
}

/*
 * This function is called during kernel startup to initialize
 * the bvme6000 IRQ handling routines.
 */
static void __init bvme6000_init_IRQ(void)
{
	m68k_setup_user_interrupt(VEC_USER, 192, NULL);
}

void __init config_bvme6000(void)
{
    volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;

    /* Board type is only set by newer versions of vmelilo/tftplilo */
    if (!vme_brdtype) {
	if (m68k_cputype == CPU_68060)
	    vme_brdtype = VME_TYPE_BVME6000;
	else
	    vme_brdtype = VME_TYPE_BVME4000;
    }
#if 0
    /* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug
     * debugger.  Note trap_init() will splat the abort vector, but
     * bvme6000_init_IRQ() will put it back again.  Hopefully. */

    bvme6000_set_vectors();
#endif

    mach_max_dma_address = 0xffffffff;
    mach_sched_init      = bvme6000_sched_init;
    mach_init_IRQ        = bvme6000_init_IRQ;
    mach_gettimeoffset   = bvme6000_gettimeoffset;
    mach_hwclk           = bvme6000_hwclk;
    mach_set_clock_mmss	 = bvme6000_set_clock_mmss;
    mach_reset		 = bvme6000_reset;
    mach_get_model       = bvme6000_get_model;
    mach_get_hardware_list = bvme6000_get_hardware_list;

    printk ("Board is %sconfigured as a System Controller\n",
		*config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not ");

    /* Now do the PIT configuration */

    pit->pgcr	= 0x00;	/* Unidirectional 8 bit, no handshake for now */
    pit->psrr	= 0x18;	/* PIACK and PIRQ functions enabled */
    pit->pacr	= 0x00;	/* Sub Mode 00, H2 i/p, no DMA */
    pit->padr	= 0x00;	/* Just to be tidy! */
    pit->paddr	= 0x00;	/* All inputs for now (safest) */
    pit->pbcr	= 0x80;	/* Sub Mode 1x, H4 i/p, no DMA */
    pit->pbdr	= 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40);
			/* PRI, SYSCON?, Level3, SCC clks from xtal */
    pit->pbddr	= 0xf3;	/* Mostly outputs */
    pit->pcdr	= 0x01;	/* PA transceiver disabled */
    pit->pcddr	= 0x03;	/* WDOG disable */

    /* Disable snooping for Ethernet and VME accesses */

    bvme_acr_addrctl = 0;
}


irqreturn_t bvme6000_abort_int (int irq, void *dev_id)
{
        unsigned long *new = (unsigned long *)vectors;
        unsigned long *old = (unsigned long *)0xf8000000;

        /* Wait for button release */
        while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS)
                ;

        *(new+4) = *(old+4);            /* Illegal instruction */
        *(new+9) = *(old+9);            /* Trace */
        *(new+47) = *(old+47);          /* Trap #15 */
        *(new+0x1f) = *(old+0x1f);      /* ABORT switch */
	return IRQ_HANDLED;
}


static irqreturn_t bvme6000_timer_int (int irq, void *dev_id)
{
    volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
    unsigned char msr = rtc->msr & 0xc0;

    rtc->msr = msr | 0x20;		/* Ack the interrupt */

    return tick_handler(irq, dev_id);
}

/*
 * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms
 * (40000 x 125ns).  It will interrupt every 10ms, when T1 goes low.
 * So, when reading the elapsed time, you should read timer1,
 * subtract it from 39999, and then add 40000 if T1 is high.
 * That gives you the number of 125ns ticks in to the 10ms period,
 * so divide by 8 to get the microsecond result.
 */

void bvme6000_sched_init (irq_handler_t timer_routine)
{
    volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
    unsigned char msr = rtc->msr & 0xc0;

    rtc->msr = 0;	/* Ensure timer registers accessible */

    tick_handler = timer_routine;
    if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0,
				"timer", bvme6000_timer_int))
	panic ("Couldn't register timer int");

    rtc->t1cr_omr = 0x04;	/* Mode 2, ext clk */
    rtc->t1msb = 39999 >> 8;
    rtc->t1lsb = 39999 & 0xff;
    rtc->irr_icr1 &= 0xef;	/* Route timer 1 to INTR pin */
    rtc->msr = 0x40;		/* Access int.cntrl, etc */
    rtc->pfr_icr0 = 0x80;	/* Just timer 1 ints enabled */
    rtc->irr_icr1 = 0;
    rtc->t1cr_omr = 0x0a;	/* INTR+T1 active lo, push-pull */
    rtc->t0cr_rtmr &= 0xdf;	/* Stop timers in standby */
    rtc->msr = 0;		/* Access timer 1 control */
    rtc->t1cr_omr = 0x05;	/* Mode 2, ext clk, GO */

    rtc->msr = msr;

    if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0,
				"abort", bvme6000_abort_int))
	panic ("Couldn't register abort int");
}


/* This is always executed with interrupts disabled.  */

/*
 * NOTE:  Don't accept any readings within 5us of rollover, as
 * the T1INT bit may be a little slow getting set.  There is also
 * a fault in the chip, meaning that reads may produce invalid
 * results...
 */

unsigned long bvme6000_gettimeoffset (void)
{
    volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
    volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
    unsigned char msr = rtc->msr & 0xc0;
    unsigned char t1int, t1op;
    unsigned long v = 800000, ov;

    rtc->msr = 0;	/* Ensure timer registers accessible */

    do {
	ov = v;
	t1int = rtc->msr & 0x20;
	t1op  = pit->pcdr & 0x04;
	rtc->t1cr_omr |= 0x40;		/* Latch timer1 */
	v = rtc->t1msb << 8;		/* Read timer1 */
	v |= rtc->t1lsb;		/* Read timer1 */
    } while (t1int != (rtc->msr & 0x20) ||
		t1op != (pit->pcdr & 0x04) ||
			abs(ov-v) > 80 ||
				v > 39960);

    v = 39999 - v;
    if (!t1op)				/* If in second half cycle.. */
	v += 40000;
    v /= 8;				/* Convert ticks to microseconds */
    if (t1int)
	v += 10000;			/* Int pending, + 10ms */
    rtc->msr = msr;

    return v;
}

static unsigned char bcd2bin (unsigned char b)
{
	return ((b>>4)*10 + (b&15));
}

static unsigned char bin2bcd (unsigned char b)
{
	return (((b/10)*16) + (b%10));
}


/*
 * Looks like op is non-zero for setting the clock, and zero for
 * reading the clock.
 *
 *  struct hwclk_time {
 *         unsigned        sec;       0..59
 *         unsigned        min;       0..59
 *         unsigned        hour;      0..23
 *         unsigned        day;       1..31
 *         unsigned        mon;       0..11
 *         unsigned        year;      00...
 *         int             wday;      0..6, 0 is Sunday, -1 means unknown/don't set
 * };
 */

int bvme6000_hwclk(int op, struct rtc_time *t)
{
	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
	unsigned char msr = rtc->msr & 0xc0;

	rtc->msr = 0x40;	/* Ensure clock and real-time-mode-register
				 * are accessible */
	if (op)
	{	/* Write.... */
		rtc->t0cr_rtmr = t->tm_year%4;
		rtc->bcd_tenms = 0;
		rtc->bcd_sec = bin2bcd(t->tm_sec);
		rtc->bcd_min = bin2bcd(t->tm_min);
		rtc->bcd_hr  = bin2bcd(t->tm_hour);
		rtc->bcd_dom = bin2bcd(t->tm_mday);
		rtc->bcd_mth = bin2bcd(t->tm_mon + 1);
		rtc->bcd_year = bin2bcd(t->tm_year%100);
		if (t->tm_wday >= 0)
			rtc->bcd_dow = bin2bcd(t->tm_wday+1);
		rtc->t0cr_rtmr = t->tm_year%4 | 0x08;
	}
	else
	{	/* Read....  */
		do {
			t->tm_sec  = bcd2bin(rtc->bcd_sec);
			t->tm_min  = bcd2bin(rtc->bcd_min);
			t->tm_hour = bcd2bin(rtc->bcd_hr);
			t->tm_mday = bcd2bin(rtc->bcd_dom);
			t->tm_mon  = bcd2bin(rtc->bcd_mth)-1;
			t->tm_year = bcd2bin(rtc->bcd_year);
			if (t->tm_year < 70)
				t->tm_year += 100;
			t->tm_wday = bcd2bin(rtc->bcd_dow)-1;
		} while (t->tm_sec != bcd2bin(rtc->bcd_sec));
	}

	rtc->msr = msr;

	return 0;
}

/*
 * Set the minutes and seconds from seconds value 'nowtime'.  Fail if
 * clock is out by > 30 minutes.  Logic lifted from atari code.
 * Algorithm is to wait for the 10ms register to change, and then to
 * wait a short while, and then set it.
 */

int bvme6000_set_clock_mmss (unsigned long nowtime)
{
	int retval = 0;
	short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
	unsigned char rtc_minutes, rtc_tenms;
	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
	unsigned char msr = rtc->msr & 0xc0;
	unsigned long flags;
	volatile int i;

	rtc->msr = 0;		/* Ensure clock accessible */
	rtc_minutes = bcd2bin (rtc->bcd_min);

	if ((rtc_minutes < real_minutes
		? real_minutes - rtc_minutes
			: rtc_minutes - real_minutes) < 30)
	{
		local_irq_save(flags);
		rtc_tenms = rtc->bcd_tenms;
		while (rtc_tenms == rtc->bcd_tenms)
			;
		for (i = 0; i < 1000; i++)
			;
		rtc->bcd_min = bin2bcd(real_minutes);
		rtc->bcd_sec = bin2bcd(real_seconds);
		local_irq_restore(flags);
	}
	else
		retval = -1;

	rtc->msr = msr;

	return retval;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* arch/m68k/bvme6000/config.c
	3	*
	4	* Copyright (C) 1997 Richard Hirst [richard@sleepie.demon.co.uk]
	5	*
	6	* Based on:
	7	*
	8	* linux/amiga/config.c
	9	*
	10	* Copyright (C) 1993 Hamish Macdonald
	11	*
	12	* This file is subject to the terms and conditions of the GNU General Public
	13	* License. See the file README.legal in the main directory of this archive
	14	* for more details.
	15	*/
	16
	17	#include <linux/types.h>
	18	#include <linux/kernel.h>
	19	#include <linux/mm.h>
	20	#include <linux/tty.h>
	21	#include <linux/console.h>
	22	#include <linux/linkage.h>
	23	#include <linux/init.h>
	24	#include <linux/major.h>
	25	#include <linux/genhd.h>
	26	#include <linux/rtc.h>
	27	#include <linux/interrupt.h>
	28
	29	#include <asm/bootinfo.h>
	30	#include <asm/system.h>
	31	#include <asm/pgtable.h>
	32	#include <asm/setup.h>
	33	#include <asm/irq.h>
	34	#include <asm/traps.h>
	35	#include <asm/rtc.h>
	36	#include <asm/machdep.h>
	37	#include <asm/bvme6000hw.h>
	38
1da177e4 LT	39	static void bvme6000_get_model(char *model);
1da177e4 LT	40	static int bvme6000_get_hardware_list(char *buffer);
40220c1a	41	extern void bvme6000_sched_init(irq_handler_t handler);
1da177e4 LT	42	extern unsigned long bvme6000_gettimeoffset (void);
	43	extern int bvme6000_hwclk (int, struct rtc_time *);
	44	extern int bvme6000_set_clock_mmss (unsigned long);
	45	extern void bvme6000_reset (void);
	46	extern void bvme6000_waitbut(void);
	47	void bvme6000_set_vectors (void);
	48
	49	static unsigned char bcd2bin (unsigned char b);
	50	static unsigned char bin2bcd (unsigned char b);
	51
	52	/* Save tick handler routine pointer, will point to do_timer() in
	53	* kernel/sched.c, called via bvme6000_process_int() */
	54
40220c1a	55	static irq_handler_t tick_handler;
1da177e4 LT	56
	57
	58	int bvme6000_parse_bootinfo(const struct bi_record *bi)
	59	{
	60	if (bi->tag == BI_VME_TYPE)
	61	return 0;
	62	else
	63	return 1;
	64	}
	65
	66	void bvme6000_reset(void)
	67	{
	68	volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
	69
	70	printk ("\r\n\nCalled bvme6000_reset\r\n"
	71	"\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r");
	72	/* The string of returns is to delay the reset until the whole
	73	* message is output. */
	74	/* Enable the watchdog, via PIT port C bit 4 */
	75
	76	pit->pcddr \|= 0x10; /* WDOG enable */
	77
	78	while(1)
	79	;
	80	}
	81
	82	static void bvme6000_get_model(char *model)
	83	{
	84	sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4);
	85	}
	86
	87
	88	/* No hardware options on BVME6000? */
	89
	90	static int bvme6000_get_hardware_list(char *buffer)
	91	{
	92	*buffer = '\0';
	93	return 0;
	94	}
	95
200a3d35 RZ	96	/*
	97	* This function is called during kernel startup to initialize
	98	* the bvme6000 IRQ handling routines.
	99	*/
66a3f820	100	static void __init bvme6000_init_IRQ(void)
200a3d35 RZ	101	{
	102	m68k_setup_user_interrupt(VEC_USER, 192, NULL);
	103	}
1da177e4 LT	104
	105	void __init config_bvme6000(void)
	106	{
	107	volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
	108
	109	/* Board type is only set by newer versions of vmelilo/tftplilo */
	110	if (!vme_brdtype) {
	111	if (m68k_cputype == CPU_68060)
	112	vme_brdtype = VME_TYPE_BVME6000;
	113	else
	114	vme_brdtype = VME_TYPE_BVME4000;
	115	}
	116	#if 0
	117	/* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug
	118	* debugger. Note trap_init() will splat the abort vector, but
	119	* bvme6000_init_IRQ() will put it back again. Hopefully. */
	120
	121	bvme6000_set_vectors();
	122	#endif
	123
	124	mach_max_dma_address = 0xffffffff;
	125	mach_sched_init = bvme6000_sched_init;
	126	mach_init_IRQ = bvme6000_init_IRQ;
	127	mach_gettimeoffset = bvme6000_gettimeoffset;
	128	mach_hwclk = bvme6000_hwclk;
	129	mach_set_clock_mmss = bvme6000_set_clock_mmss;
	130	mach_reset = bvme6000_reset;
1da177e4 LT	131	mach_get_model = bvme6000_get_model;
	132	mach_get_hardware_list = bvme6000_get_hardware_list;
	133
	134	printk ("Board is %sconfigured as a System Controller\n",
	135	*config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not ");
	136
	137	/* Now do the PIT configuration */
	138
	139	pit->pgcr = 0x00; /* Unidirectional 8 bit, no handshake for now */
0b28002f	140	pit->psrr = 0x18; /* PIACK and PIRQ functions enabled */
1da177e4 LT	141	pit->pacr = 0x00; /* Sub Mode 00, H2 i/p, no DMA */
	142	pit->padr = 0x00; /* Just to be tidy! */
	143	pit->paddr = 0x00; /* All inputs for now (safest) */
	144	pit->pbcr = 0x80; /* Sub Mode 1x, H4 i/p, no DMA */
	145	pit->pbdr = 0xbc \| (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40);
	146	/* PRI, SYSCON?, Level3, SCC clks from xtal */
	147	pit->pbddr = 0xf3; /* Mostly outputs */
	148	pit->pcdr = 0x01; /* PA transceiver disabled */
	149	pit->pcddr = 0x03; /* WDOG disable */
	150
	151	/* Disable snooping for Ethernet and VME accesses */
	152
	153	bvme_acr_addrctl = 0;
	154	}
	155
	156
2850bc27	157	irqreturn_t bvme6000_abort_int (int irq, void *dev_id)
1da177e4 LT	158	{
	159	unsigned long new = (unsigned long )vectors;
	160	unsigned long old = (unsigned long )0xf8000000;
	161
	162	/* Wait for button release */
	163	while ((volatile unsigned char )BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS)
	164	;
	165
	166	(new+4) = (old+4); /* Illegal instruction */
	167	(new+9) = (old+9); /* Trace */
	168	(new+47) = (old+47); /* Trap #15 */
	169	(new+0x1f) = (old+0x1f); /* ABORT switch */
	170	return IRQ_HANDLED;
	171	}
	172
	173
2850bc27	174	static irqreturn_t bvme6000_timer_int (int irq, void *dev_id)
1da177e4 LT	175	{
	176	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
	177	unsigned char msr = rtc->msr & 0xc0;
	178
	179	rtc->msr = msr \| 0x20; /* Ack the interrupt */
	180
2850bc27	181	return tick_handler(irq, dev_id);
1da177e4 LT	182	}
	183
	184	/*
	185	* Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms
	186	* (40000 x 125ns). It will interrupt every 10ms, when T1 goes low.
	187	* So, when reading the elapsed time, you should read timer1,
	188	* subtract it from 39999, and then add 40000 if T1 is high.
	189	* That gives you the number of 125ns ticks in to the 10ms period,
	190	* so divide by 8 to get the microsecond result.
	191	*/
	192
40220c1a	193	void bvme6000_sched_init (irq_handler_t timer_routine)
1da177e4 LT	194	{
	195	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
	196	unsigned char msr = rtc->msr & 0xc0;
	197
	198	rtc->msr = 0; /* Ensure timer registers accessible */
	199
	200	tick_handler = timer_routine;
	201	if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0,
	202	"timer", bvme6000_timer_int))
	203	panic ("Couldn't register timer int");
	204
	205	rtc->t1cr_omr = 0x04; /* Mode 2, ext clk */
	206	rtc->t1msb = 39999 >> 8;
	207	rtc->t1lsb = 39999 & 0xff;
	208	rtc->irr_icr1 &= 0xef; /* Route timer 1 to INTR pin */
	209	rtc->msr = 0x40; /* Access int.cntrl, etc */
	210	rtc->pfr_icr0 = 0x80; /* Just timer 1 ints enabled */
	211	rtc->irr_icr1 = 0;
	212	rtc->t1cr_omr = 0x0a; /* INTR+T1 active lo, push-pull */
	213	rtc->t0cr_rtmr &= 0xdf; /* Stop timers in standby */
	214	rtc->msr = 0; /* Access timer 1 control */
	215	rtc->t1cr_omr = 0x05; /* Mode 2, ext clk, GO */
	216
	217	rtc->msr = msr;
	218
	219	if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0,
	220	"abort", bvme6000_abort_int))
	221	panic ("Couldn't register abort int");
	222	}
	223
	224
	225	/* This is always executed with interrupts disabled. */
	226
	227	/*
	228	* NOTE: Don't accept any readings within 5us of rollover, as
	229	* the T1INT bit may be a little slow getting set. There is also
	230	* a fault in the chip, meaning that reads may produce invalid
	231	* results...
	232	*/
	233
	234	unsigned long bvme6000_gettimeoffset (void)
	235	{
	236	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
	237	volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
	238	unsigned char msr = rtc->msr & 0xc0;
	239	unsigned char t1int, t1op;
	240	unsigned long v = 800000, ov;
	241
	242	rtc->msr = 0; /* Ensure timer registers accessible */
	243
	244	do {
	245	ov = v;
	246	t1int = rtc->msr & 0x20;
	247	t1op = pit->pcdr & 0x04;
	248	rtc->t1cr_omr \|= 0x40; /* Latch timer1 */
	249	v = rtc->t1msb << 8; /* Read timer1 */
	250	v \|= rtc->t1lsb; /* Read timer1 */
	251	} while (t1int != (rtc->msr & 0x20) \|\|
	252	t1op != (pit->pcdr & 0x04) \|\|
	253	abs(ov-v) > 80 \|\|
	254	v > 39960);
	255
	256	v = 39999 - v;
	257	if (!t1op) /* If in second half cycle.. */
258	v += 40000;
259	v /= 8; /* Convert ticks to microseconds */
260	if (t1int)
261	v += 10000; /* Int pending, + 10ms */
262	rtc->msr = msr;
263
264	return v;
265	}
266
267	static unsigned char bcd2bin (unsigned char b)
268	{
269	return ((b>>4)*10 + (b&15));
270	}
271
272	static unsigned char bin2bcd (unsigned char b)
273	{
274	return (((b/10)*16) + (b%10));
275	}
276
277
278	/*
279	* Looks like op is non-zero for setting the clock, and zero for
280	* reading the clock.
281	*
282	* struct hwclk_time {
283	* unsigned sec; 0..59
284	* unsigned min; 0..59
285	* unsigned hour; 0..23
286	* unsigned day; 1..31
287	* unsigned mon; 0..11
288	* unsigned year; 00...
289	* int wday; 0..6, 0 is Sunday, -1 means unknown/don't set
290	* };
291	*/
292
293	int bvme6000_hwclk(int op, struct rtc_time *t)
294	{
295	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
296	unsigned char msr = rtc->msr & 0xc0;
297
298	rtc->msr = 0x40; /* Ensure clock and real-time-mode-register
299	* are accessible */
300	if (op)
301	{ /* Write.... */
302	rtc->t0cr_rtmr = t->tm_year%4;
303	rtc->bcd_tenms = 0;
304	rtc->bcd_sec = bin2bcd(t->tm_sec);
305	rtc->bcd_min = bin2bcd(t->tm_min);
306	rtc->bcd_hr = bin2bcd(t->tm_hour);
307	rtc->bcd_dom = bin2bcd(t->tm_mday);
308	rtc->bcd_mth = bin2bcd(t->tm_mon + 1);
309	rtc->bcd_year = bin2bcd(t->tm_year%100);
310	if (t->tm_wday >= 0)
311	rtc->bcd_dow = bin2bcd(t->tm_wday+1);
312	rtc->t0cr_rtmr = t->tm_year%4 \| 0x08;
313	}
314	else
315	{ /* Read.... */
316	do {
317	t->tm_sec = bcd2bin(rtc->bcd_sec);
318	t->tm_min = bcd2bin(rtc->bcd_min);
319	t->tm_hour = bcd2bin(rtc->bcd_hr);
320	t->tm_mday = bcd2bin(rtc->bcd_dom);
321	t->tm_mon = bcd2bin(rtc->bcd_mth)-1;
322	t->tm_year = bcd2bin(rtc->bcd_year);
323	if (t->tm_year < 70)
324	t->tm_year += 100;
325	t->tm_wday = bcd2bin(rtc->bcd_dow)-1;
326	} while (t->tm_sec != bcd2bin(rtc->bcd_sec));
327	}
328
329	rtc->msr = msr;
330
331	return 0;
332	}
333
334	/*
335	* Set the minutes and seconds from seconds value 'nowtime'. Fail if
336	* clock is out by > 30 minutes. Logic lifted from atari code.
337	* Algorithm is to wait for the 10ms register to change, and then to
338	* wait a short while, and then set it.
339	*/
340
341	int bvme6000_set_clock_mmss (unsigned long nowtime)
342	{
343	int retval = 0;
344	short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
345	unsigned char rtc_minutes, rtc_tenms;
346	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
347	unsigned char msr = rtc->msr & 0xc0;
348	unsigned long flags;
349	volatile int i;
350
351	rtc->msr = 0; /* Ensure clock accessible */
352	rtc_minutes = bcd2bin (rtc->bcd_min);
353
354	if ((rtc_minutes < real_minutes
355	? real_minutes - rtc_minutes
356	: rtc_minutes - real_minutes) < 30)
357	{
358	local_irq_save(flags);
359	rtc_tenms = rtc->bcd_tenms;
360	while (rtc_tenms == rtc->bcd_tenms)
361	;
362	for (i = 0; i < 1000; i++)
363	;
364	rtc->bcd_min = bin2bcd(real_minutes);
365	rtc->bcd_sec = bin2bcd(real_seconds);
366	local_irq_restore(flags);
367	}
368	else
369	retval = -1;
370
371	rtc->msr = msr;
372
373	return retval;
374	}
375