linux/arch/m68k/mvme147/config.c
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   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/clocksource.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/bootinfo-vme.h>
  31#include <asm/byteorder.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(void);
  41extern int mvme147_hwclk (int, struct rtc_time *);
  42extern void mvme147_reset (void);
  43
  44
  45static int bcd2int (unsigned char b);
  46
  47
  48int __init mvme147_parse_bootinfo(const struct bi_record *bi)
  49{
  50        uint16_t tag = be16_to_cpu(bi->tag);
  51        if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO)
  52                return 0;
  53        else
  54                return 1;
  55}
  56
  57void mvme147_reset(void)
  58{
  59        pr_info("\r\n\nCalled mvme147_reset\r\n");
  60        m147_pcc->watchdog = 0x0a;      /* Clear timer */
  61        m147_pcc->watchdog = 0xa5;      /* Enable watchdog - 100ms to reset */
  62        while (1)
  63                ;
  64}
  65
  66static void mvme147_get_model(char *model)
  67{
  68        sprintf(model, "Motorola MVME147");
  69}
  70
  71/*
  72 * This function is called during kernel startup to initialize
  73 * the mvme147 IRQ handling routines.
  74 */
  75
  76void __init mvme147_init_IRQ(void)
  77{
  78        m68k_setup_user_interrupt(VEC_USER, 192);
  79}
  80
  81void __init config_mvme147(void)
  82{
  83        mach_sched_init         = mvme147_sched_init;
  84        mach_init_IRQ           = mvme147_init_IRQ;
  85        mach_hwclk              = mvme147_hwclk;
  86        mach_reset              = mvme147_reset;
  87        mach_get_model          = mvme147_get_model;
  88
  89        /* Board type is only set by newer versions of vmelilo/tftplilo */
  90        if (!vme_brdtype)
  91                vme_brdtype = VME_TYPE_MVME147;
  92}
  93
  94static u64 mvme147_read_clk(struct clocksource *cs);
  95
  96static struct clocksource mvme147_clk = {
  97        .name   = "pcc",
  98        .rating = 250,
  99        .read   = mvme147_read_clk,
 100        .mask   = CLOCKSOURCE_MASK(32),
 101        .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
 102};
 103
 104static u32 clk_total;
 105
 106#define PCC_TIMER_CLOCK_FREQ 160000
 107#define PCC_TIMER_CYCLES     (PCC_TIMER_CLOCK_FREQ / HZ)
 108#define PCC_TIMER_PRELOAD    (0x10000 - PCC_TIMER_CYCLES)
 109
 110/* Using pcc tick timer 1 */
 111
 112static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
 113{
 114        unsigned long flags;
 115
 116        local_irq_save(flags);
 117        m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
 118                             PCC_TIMER_TIC_EN;
 119        m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
 120                                 PCC_LEVEL_TIMER1;
 121        clk_total += PCC_TIMER_CYCLES;
 122        legacy_timer_tick(1);
 123        local_irq_restore(flags);
 124
 125        return IRQ_HANDLED;
 126}
 127
 128
 129void mvme147_sched_init (void)
 130{
 131        if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER,
 132                        "timer 1", NULL))
 133                pr_err("Couldn't register timer interrupt\n");
 134
 135        /* Init the clock with a value */
 136        /* The clock counter increments until 0xFFFF then reloads */
 137        m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
 138        m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
 139                             PCC_TIMER_TIC_EN;
 140        m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
 141                                 PCC_LEVEL_TIMER1;
 142
 143        clocksource_register_hz(&mvme147_clk, PCC_TIMER_CLOCK_FREQ);
 144}
 145
 146static u64 mvme147_read_clk(struct clocksource *cs)
 147{
 148        unsigned long flags;
 149        u8 overflow, tmp;
 150        u16 count;
 151        u32 ticks;
 152
 153        local_irq_save(flags);
 154        tmp = m147_pcc->t1_cntrl >> 4;
 155        count = m147_pcc->t1_count;
 156        overflow = m147_pcc->t1_cntrl >> 4;
 157        if (overflow != tmp)
 158                count = m147_pcc->t1_count;
 159        count -= PCC_TIMER_PRELOAD;
 160        ticks = count + overflow * PCC_TIMER_CYCLES;
 161        ticks += clk_total;
 162        local_irq_restore(flags);
 163
 164        return ticks;
 165}
 166
 167static int bcd2int (unsigned char b)
 168{
 169        return ((b>>4)*10 + (b&15));
 170}
 171
 172int mvme147_hwclk(int op, struct rtc_time *t)
 173{
 174#warning check me!
 175        if (!op) {
 176                m147_rtc->ctrl = RTC_READ;
 177                t->tm_year = bcd2int (m147_rtc->bcd_year);
 178                t->tm_mon  = bcd2int(m147_rtc->bcd_mth) - 1;
 179                t->tm_mday = bcd2int (m147_rtc->bcd_dom);
 180                t->tm_hour = bcd2int (m147_rtc->bcd_hr);
 181                t->tm_min  = bcd2int (m147_rtc->bcd_min);
 182                t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
 183                m147_rtc->ctrl = 0;
 184                if (t->tm_year < 70)
 185                        t->tm_year += 100;
 186        }
 187        return 0;
 188}
 189