config.c

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/*
 *  arch/m68k/q40/config.c
 *
 *  Copyright (C) 1999 Richard Zidlicky
 *
 * originally based on:
 *
 *  linux/bvme/config.c
 *
 * 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/serial_reg.h>
#include <linux/rtc.h>
#include <linux/vt_kern.h>
#include <linux/bcd.h>
#include <linux/platform_device.h>

#include <asm/io.h>
#include <asm/rtc.h>
#include <asm/bootinfo.h>
#include <asm/pgtable.h>
#include <asm/setup.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/machdep.h>
#include <asm/q40_master.h>

extern void q40_init_IRQ(void);
static void q40_get_model(char *model);
extern void q40_sched_init(irq_handler_t handler);

static unsigned long q40_gettimeoffset(void);
static int q40_hwclk(int, struct rtc_time *);
static unsigned int q40_get_ss(void);
static int q40_set_clock_mmss(unsigned long);
static int q40_get_rtc_pll(struct rtc_pll_info *pll);
static int q40_set_rtc_pll(struct rtc_pll_info *pll);

extern void q40_mksound(unsigned int /*freq*/, unsigned int /*ticks*/);

static void q40_mem_console_write(struct console *co, const char *b,
                  unsigned int count);

extern int ql_ticks;

static struct console q40_console_driver = {
    .name   = "debug",
    .write  = q40_mem_console_write,
    .flags  = CON_PRINTBUFFER,
    .index  = -1,
};


/* early debugging function:*/
extern char *q40_mem_cptr; /*=(char *)0xff020000;*/
static int _cpleft;

static void q40_mem_console_write(struct console *co, const char *s,
                  unsigned int count)
{
    const char *p = s;

    if (count < _cpleft) {
        while (count-- > 0) {
            *q40_mem_cptr = *p++;
            q40_mem_cptr += 4;
            _cpleft--;
        }
    }
}

static int __init q40_debug_setup(char *arg)
{
    /* useful for early debugging stages - writes kernel messages into SRAM */
    if (MACH_IS_Q40 && !strncmp(arg, "mem", 3)) {
        /*printk("using NVRAM debug, q40_mem_cptr=%p\n",q40_mem_cptr);*/
        _cpleft = 2000 - ((long)q40_mem_cptr-0xff020000) / 4;
        register_console(&q40_console_driver);
    }
    return 0;
}

early_param("debug", q40_debug_setup);

#if 0
void printq40(char *str)
{
    int l = strlen(str);
    char *p = q40_mem_cptr;

    while (l-- > 0 && _cpleft-- > 0) {
        *p = *str++;
        p += 4;
    }
    q40_mem_cptr = p;
}
#endif

static int halted;

#ifdef CONFIG_HEARTBEAT
static void q40_heartbeat(int on)
{
    if (halted)
        return;

    if (on)
        Q40_LED_ON();
    else
        Q40_LED_OFF();
}
#endif

static void q40_reset(void)
{
        halted = 1;
        printk("\n\n*******************************************\n"
        "Called q40_reset : press the RESET button!!\n"
        "*******************************************\n");
    Q40_LED_ON();
    while (1)
        ;
}

static void q40_halt(void)
{
        halted = 1;
        printk("\n\n*******************\n"
           "  Called q40_halt\n"
           "*******************\n");
    Q40_LED_ON();
    while (1)
        ;
}

static void q40_get_model(char *model)
{
    sprintf(model, "Q40");
}

static unsigned int serports[] =
{
    0x3f8,0x2f8,0x3e8,0x2e8,0
};

static void q40_disable_irqs(void)
{
    unsigned i, j;

    j = 0;
    while ((i = serports[j++]))
        outb(0, i + UART_IER);
    master_outb(0, EXT_ENABLE_REG);
    master_outb(0, KEY_IRQ_ENABLE_REG);
}

void __init config_q40(void)
{
    mach_sched_init = q40_sched_init;

    mach_init_IRQ = q40_init_IRQ;
    mach_gettimeoffset = q40_gettimeoffset;
    mach_hwclk = q40_hwclk;
    mach_get_ss = q40_get_ss;
    mach_get_rtc_pll = q40_get_rtc_pll;
    mach_set_rtc_pll = q40_set_rtc_pll;
    mach_set_clock_mmss = q40_set_clock_mmss;

    mach_reset = q40_reset;
    mach_get_model = q40_get_model;

#if defined(CONFIG_INPUT_M68K_BEEP) || defined(CONFIG_INPUT_M68K_BEEP_MODULE)
    mach_beep = q40_mksound;
#endif
#ifdef CONFIG_HEARTBEAT
    mach_heartbeat = q40_heartbeat;
#endif
    mach_halt = q40_halt;

    /* disable a few things that SMSQ might have left enabled */
    q40_disable_irqs();

    /* no DMA at all, but ide-scsi requires it.. make sure
     * all physical RAM fits into the boundary - otherwise
     * allocator may play costly and useless tricks */
    mach_max_dma_address = 1024*1024*1024;
}


int q40_parse_bootinfo(const struct bi_record *rec)
{
    return 1;
}


static unsigned long q40_gettimeoffset(void)
{
    return 5000 * (ql_ticks != 0);
}


/*
 * 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
 * };
 */

static int q40_hwclk(int op, struct rtc_time *t)
{
    if (op) {
        /* Write.... */
        Q40_RTC_CTRL |= Q40_RTC_WRITE;

        Q40_RTC_SECS = bin2bcd(t->tm_sec);
        Q40_RTC_MINS = bin2bcd(t->tm_min);
        Q40_RTC_HOUR = bin2bcd(t->tm_hour);
        Q40_RTC_DATE = bin2bcd(t->tm_mday);
        Q40_RTC_MNTH = bin2bcd(t->tm_mon + 1);
        Q40_RTC_YEAR = bin2bcd(t->tm_year%100);
        if (t->tm_wday >= 0)
            Q40_RTC_DOW = bin2bcd(t->tm_wday+1);

        Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
    } else {
        /* Read....  */
        Q40_RTC_CTRL |= Q40_RTC_READ;

        t->tm_year = bcd2bin (Q40_RTC_YEAR);
        t->tm_mon  = bcd2bin (Q40_RTC_MNTH)-1;
        t->tm_mday = bcd2bin (Q40_RTC_DATE);
        t->tm_hour = bcd2bin (Q40_RTC_HOUR);
        t->tm_min  = bcd2bin (Q40_RTC_MINS);
        t->tm_sec  = bcd2bin (Q40_RTC_SECS);

        Q40_RTC_CTRL &= ~(Q40_RTC_READ);

        if (t->tm_year < 70)
            t->tm_year += 100;
        t->tm_wday = bcd2bin(Q40_RTC_DOW)-1;
    }

    return 0;
}

static unsigned int q40_get_ss(void)
{
    return bcd2bin(Q40_RTC_SECS);
}

/*
 * Set the minutes and seconds from seconds value 'nowtime'.  Fail if
 * clock is out by > 30 minutes.  Logic lifted from atari code.
 */

static int q40_set_clock_mmss(unsigned long nowtime)
{
    int retval = 0;
    short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;

    int rtc_minutes;

    rtc_minutes = bcd2bin(Q40_RTC_MINS);

    if ((rtc_minutes < real_minutes ?
         real_minutes - rtc_minutes :
         rtc_minutes - real_minutes) < 30) {
        Q40_RTC_CTRL |= Q40_RTC_WRITE;
        Q40_RTC_MINS = bin2bcd(real_minutes);
        Q40_RTC_SECS = bin2bcd(real_seconds);
        Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
    } else
        retval = -1;

    return retval;
}


/* get and set PLL calibration of RTC clock */
#define Q40_RTC_PLL_MASK ((1<<5)-1)
#define Q40_RTC_PLL_SIGN (1<<5)

static int q40_get_rtc_pll(struct rtc_pll_info *pll)
{
    int tmp = Q40_RTC_CTRL;

    pll->pll_value = tmp & Q40_RTC_PLL_MASK;
    if (tmp & Q40_RTC_PLL_SIGN)
        pll->pll_value = -pll->pll_value;
    pll->pll_max = 31;
    pll->pll_min = -31;
    pll->pll_posmult = 512;
    pll->pll_negmult = 256;
    pll->pll_clock = 125829120;

    return 0;
}

static int q40_set_rtc_pll(struct rtc_pll_info *pll)
{
    if (!pll->pll_ctrl) {
        /* the docs are a bit unclear so I am doublesetting */
        /* RTC_WRITE here ... */
        int tmp = (pll->pll_value & 31) | (pll->pll_value<0 ? 32 : 0) |
              Q40_RTC_WRITE;
        Q40_RTC_CTRL |= Q40_RTC_WRITE;
        Q40_RTC_CTRL = tmp;
        Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
        return 0;
    } else
        return -EINVAL;
}

static __init int q40_add_kbd_device(void)
{
    struct platform_device *pdev;

    if (!MACH_IS_Q40)
        return -ENODEV;

    pdev = platform_device_register_simple("q40kbd", -1, NULL, 0);
    return PTR_RET(pdev);
}
arch_initcall(q40_add_kbd_device);