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/machdep.h>
  36#include <asm/mvme147hw.h>
  37
  38
  39static void mvme147_get_model(char *model);
  40extern void mvme147_sched_init(irq_handler_t handler);
  41extern u32 mvme147_gettimeoffset(void);
  42extern int mvme147_hwclk (int, struct rtc_time *);
  43extern int mvme147_set_clock_mmss (unsigned long);
  44extern void mvme147_reset (void);
  45
  46
  47static int bcd2int (unsigned char b);
  48
  49/* Save tick handler routine pointer, will point to xtime_update() in
  50 * kernel/time/timekeeping.c, called via mvme147_process_int() */
  51
  52irq_handler_t tick_handler;
  53
  54
  55int __init mvme147_parse_bootinfo(const struct bi_record *bi)
  56{
  57        uint16_t tag = be16_to_cpu(bi->tag);
  58        if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO)
  59                return 0;
  60        else
  61                return 1;
  62}
  63
  64void mvme147_reset(void)
  65{
  66        pr_info("\r\n\nCalled mvme147_reset\r\n");
  67        m147_pcc->watchdog = 0x0a;      /* Clear timer */
  68        m147_pcc->watchdog = 0xa5;      /* Enable watchdog - 100ms to reset */
  69        while (1)
  70                ;
  71}
  72
  73static void mvme147_get_model(char *model)
  74{
  75        sprintf(model, "Motorola MVME147");
  76}
  77
  78/*
  79 * This function is called during kernel startup to initialize
  80 * the mvme147 IRQ handling routines.
  81 */
  82
  83void __init mvme147_init_IRQ(void)
  84{
  85        m68k_setup_user_interrupt(VEC_USER, 192);
  86}
  87
  88void __init config_mvme147(void)
  89{
  90        mach_max_dma_address    = 0x01000000;
  91        mach_sched_init         = mvme147_sched_init;
  92        mach_init_IRQ           = mvme147_init_IRQ;
  93        arch_gettimeoffset      = mvme147_gettimeoffset;
  94        mach_hwclk              = mvme147_hwclk;
  95        mach_set_clock_mmss     = mvme147_set_clock_mmss;
  96        mach_reset              = mvme147_reset;
  97        mach_get_model          = mvme147_get_model;
  98
  99        /* Board type is only set by newer versions of vmelilo/tftplilo */
 100        if (!vme_brdtype)
 101                vme_brdtype = VME_TYPE_MVME147;
 102}
 103
 104
 105/* Using pcc tick timer 1 */
 106
 107static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
 108{
 109        m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
 110        m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 111        return tick_handler(irq, dev_id);
 112}
 113
 114
 115void mvme147_sched_init (irq_handler_t timer_routine)
 116{
 117        tick_handler = timer_routine;
 118        if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, 0, "timer 1", NULL))
 119                pr_err("Couldn't register timer interrupt\n");
 120
 121        /* Init the clock with a value */
 122        /* our clock goes off every 6.25us */
 123        m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
 124        m147_pcc->t1_cntrl = 0x0;       /* clear timer */
 125        m147_pcc->t1_cntrl = 0x3;       /* start timer */
 126        m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;  /* clear pending ints */
 127        m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 128}
 129
 130/* This is always executed with interrupts disabled.  */
 131/* XXX There are race hazards in this code XXX */
 132u32 mvme147_gettimeoffset(void)
 133{
 134        volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012;
 135        unsigned short n;
 136
 137        n = *cp;
 138        while (n != *cp)
 139                n = *cp;
 140
 141        n -= PCC_TIMER_PRELOAD;
 142        return ((unsigned long)n * 25 / 4) * 1000;
 143}
 144
 145static int bcd2int (unsigned char b)
 146{
 147        return ((b>>4)*10 + (b&15));
 148}
 149
 150int mvme147_hwclk(int op, struct rtc_time *t)
 151{
 152#warning check me!
 153        if (!op) {
 154                m147_rtc->ctrl = RTC_READ;
 155                t->tm_year = bcd2int (m147_rtc->bcd_year);
 156                t->tm_mon  = bcd2int (m147_rtc->bcd_mth);
 157                t->tm_mday = bcd2int (m147_rtc->bcd_dom);
 158                t->tm_hour = bcd2int (m147_rtc->bcd_hr);
 159                t->tm_min  = bcd2int (m147_rtc->bcd_min);
 160                t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
 161                m147_rtc->ctrl = 0;
 162        }
 163        return 0;
 164}
 165
 166int mvme147_set_clock_mmss (unsigned long nowtime)
 167{
 168        return 0;
 169}
 170