Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 *  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;

}