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/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
  39 static void mvme147_get_model(char *model);
  40 extern void mvme147_sched_init(void);
  41 extern int mvme147_hwclk (int, struct rtc_time *);
  42 extern void mvme147_reset (void);
  43
  44
  45 static int bcd2int (unsigned char b);
  46
  47
  48 int __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
  57 void 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
  66 static 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
  76 void __init mvme147_init_IRQ(void)
  77 {
  78         m68k_setup_user_interrupt(VEC_USER, 192);
  79 }
  80
  81 void __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
  94 static u64 mvme147_read_clk(struct clocksource *cs);
  95
  96 static 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
 104 static 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
 112 static 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_int_cntrl = PCC_TIMER_INT_CLR;
 118         m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF;
 119         clk_total += PCC_TIMER_CYCLES;
 120         legacy_timer_tick(1);
 121         local_irq_restore(flags);
 122
 123         return IRQ_HANDLED;
 124 }
 125
 126
 127 void mvme147_sched_init (void)
 128 {
 129         if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER,
 130                         "timer 1", NULL))
 131                 pr_err("Couldn't register timer interrupt\n");
 132
 133         /* Init the clock with a value */
 134         /* The clock counter increments until 0xFFFF then reloads */
 135         m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
 136         m147_pcc->t1_cntrl = 0x0;       /* clear timer */
 137         m147_pcc->t1_cntrl = 0x3;       /* start timer */
 138         m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;  /* clear pending ints */
 139         m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 140
 141         clocksource_register_hz(&mvme147_clk, PCC_TIMER_CLOCK_FREQ);
 142 }
 143
 144 static u64 mvme147_read_clk(struct clocksource *cs)
 145 {
 146         unsigned long flags;
 147         u8 overflow, tmp;
 148         u16 count;
 149         u32 ticks;
 150
 151         local_irq_save(flags);
 152         tmp = m147_pcc->t1_cntrl >> 4;
 153         count = m147_pcc->t1_count;
 154         overflow = m147_pcc->t1_cntrl >> 4;
 155         if (overflow != tmp)
 156                 count = m147_pcc->t1_count;
 157         count -= PCC_TIMER_PRELOAD;
 158         ticks = count + overflow * PCC_TIMER_CYCLES;
 159         ticks += clk_total;
 160         local_irq_restore(flags);
 161
 162         return ticks;
 163 }
 164
 165 static int bcd2int (unsigned char b)
 166 {
 167         return ((b>>4)*10 + (b&15));
 168 }
 169
 170 int mvme147_hwclk(int op, struct rtc_time *t)
 171 {
 172 #warning check me!
 173         if (!op) {
 174                 m147_rtc->ctrl = RTC_READ;
 175                 t->tm_year = bcd2int (m147_rtc->bcd_year);
 176                 t->tm_mon  = bcd2int(m147_rtc->bcd_mth) - 1;
 177                 t->tm_mday = bcd2int (m147_rtc->bcd_dom);
 178                 t->tm_hour = bcd2int (m147_rtc->bcd_hr);
 179                 t->tm_min  = bcd2int (m147_rtc->bcd_min);
 180                 t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
 181                 m147_rtc->ctrl = 0;
 182                 if (t->tm_year < 70)
 183                         t->tm_year += 100;
 184         }
 185         return 0;
 186 }