LXR linux/arch/m68k/mvme147/config.c

   1/*
   2 *  arch/m68k/mvme147/config.c
   3 *
   4 *  Copyright (C) 1996 Dave Frascone [chaos@mindspring.com]
   5 *  Cloned from        Richard Hirst [richard@sleepie.demon.co.uk]
   6 *
   7 * Based on:
   8 *
   9 *  Copyright (C) 1993 Hamish Macdonald
  10 *
  11 * This file is subject to the terms and conditions of the GNU General Public
  12 * License.  See the file README.legal in the main directory of this archive
  13 * for more details.
  14 */
  15
  16#include <linux/types.h>
  17#include <linux/kernel.h>
  18#include <linux/mm.h>
  19#include <linux/tty.h>
  20#include <linux/console.h>
  21#include <linux/linkage.h>
  22#include <linux/init.h>
  23#include <linux/major.h>
  24#include <linux/genhd.h>
  25#include <linux/rtc.h>
  26#include <linux/interrupt.h>
  27
  28#include <asm/bootinfo.h>
  29#include <asm/bootinfo-vme.h>
  30#include <asm/byteorder.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/mvme147hw.h>
  38
  39
  40static void mvme147_get_model(char *model);
  41extern void mvme147_sched_init(irq_handler_t handler);
  42extern u32 mvme147_gettimeoffset(void);
  43extern int mvme147_hwclk (int, struct rtc_time *);
  44extern int mvme147_set_clock_mmss (unsigned long);
  45extern void mvme147_reset (void);
  46
  47
  48static int bcd2int (unsigned char b);
  49
  50/* Save tick handler routine pointer, will point to xtime_update() in
  51 * kernel/time/timekeeping.c, called via mvme147_process_int() */
  52
  53irq_handler_t tick_handler;
  54
  55
  56int __init mvme147_parse_bootinfo(const struct bi_record *bi)
  57{
  58        uint16_t tag = be16_to_cpu(bi->tag);
  59        if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO)
  60                return 0;
  61        else
  62                return 1;
  63}
  64
  65void mvme147_reset(void)
  66{
  67        printk ("\r\n\nCalled mvme147_reset\r\n");
  68        m147_pcc->watchdog = 0x0a;      /* Clear timer */
  69        m147_pcc->watchdog = 0xa5;      /* Enable watchdog - 100ms to reset */
  70        while (1)
  71                ;
  72}
  73
  74static void mvme147_get_model(char *model)
  75{
  76        sprintf(model, "Motorola MVME147");
  77}
  78
  79/*
  80 * This function is called during kernel startup to initialize
  81 * the mvme147 IRQ handling routines.
  82 */
  83
  84void __init mvme147_init_IRQ(void)
  85{
  86        m68k_setup_user_interrupt(VEC_USER, 192);
  87}
  88
  89void __init config_mvme147(void)
  90{
  91        mach_max_dma_address    = 0x01000000;
  92        mach_sched_init         = mvme147_sched_init;
  93        mach_init_IRQ           = mvme147_init_IRQ;
  94        arch_gettimeoffset      = mvme147_gettimeoffset;
  95        mach_hwclk              = mvme147_hwclk;
  96        mach_set_clock_mmss     = mvme147_set_clock_mmss;
  97        mach_reset              = mvme147_reset;
  98        mach_get_model          = mvme147_get_model;
  99
 100        /* Board type is only set by newer versions of vmelilo/tftplilo */
 101        if (!vme_brdtype)
 102                vme_brdtype = VME_TYPE_MVME147;
 103}
 104
 105
 106/* Using pcc tick timer 1 */
 107
 108static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
 109{
 110        m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
 111        m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 112        return tick_handler(irq, dev_id);
 113}
 114
 115
 116void mvme147_sched_init (irq_handler_t timer_routine)
 117{
 118        tick_handler = timer_routine;
 119        if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, 0, "timer 1", NULL))
 120                pr_err("Couldn't register timer interrupt\n");
 121
 122        /* Init the clock with a value */
 123        /* our clock goes off every 6.25us */
 124        m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
 125        m147_pcc->t1_cntrl = 0x0;       /* clear timer */
 126        m147_pcc->t1_cntrl = 0x3;       /* start timer */
 127        m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;  /* clear pending ints */
 128        m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 129}
 130
 131/* This is always executed with interrupts disabled.  */
 132/* XXX There are race hazards in this code XXX */
 133u32 mvme147_gettimeoffset(void)
 134{
 135        volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012;
 136        unsigned short n;
 137
 138        n = *cp;
 139        while (n != *cp)
 140                n = *cp;
 141
 142        n -= PCC_TIMER_PRELOAD;
 143        return ((unsigned long)n * 25 / 4) * 1000;
 144}
 145
 146static int bcd2int (unsigned char b)
 147{
 148        return ((b>>4)*10 + (b&15));
 149}
 150
 151int mvme147_hwclk(int op, struct rtc_time *t)
 152{
 153#warning check me!
 154        if (!op) {
 155                m147_rtc->ctrl = RTC_READ;
 156                t->tm_year = bcd2int (m147_rtc->bcd_year);
 157                t->tm_mon  = bcd2int (m147_rtc->bcd_mth);
 158                t->tm_mday = bcd2int (m147_rtc->bcd_dom);
 159                t->tm_hour = bcd2int (m147_rtc->bcd_hr);
 160                t->tm_min  = bcd2int (m147_rtc->bcd_min);
 161                t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
 162                m147_rtc->ctrl = 0;
 163        }
 164        return 0;
 165}
 166
 167int mvme147_set_clock_mmss (unsigned long nowtime)
 168{
 169        return 0;
 170}
 171