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/pgtable.h>
  33 #include <asm/setup.h>
  34 #include <asm/irq.h>
  35 #include <asm/traps.h>
  36 #include <asm/machdep.h>
  37 #include <asm/mvme147hw.h>
  38
  39
  40 static void mvme147_get_model(char *model);
  41 extern void mvme147_sched_init(irq_handler_t handler);
  42 extern int mvme147_hwclk (int, struct rtc_time *);
  43 extern void mvme147_reset (void);
  44
  45
  46 static int bcd2int (unsigned char b);
  47
  48
  49 int __init mvme147_parse_bootinfo(const struct bi_record *bi)
  50 {
  51         uint16_t tag = be16_to_cpu(bi->tag);
  52         if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO)
  53                 return 0;
  54         else
  55                 return 1;
  56 }
  57
  58 void mvme147_reset(void)
  59 {
  60         pr_info("\r\n\nCalled mvme147_reset\r\n");
  61         m147_pcc->watchdog = 0x0a;      /* Clear timer */
  62         m147_pcc->watchdog = 0xa5;      /* Enable watchdog - 100ms to reset */
  63         while (1)
  64                 ;
  65 }
  66
  67 static void mvme147_get_model(char *model)
  68 {
  69         sprintf(model, "Motorola MVME147");
  70 }
  71
  72 /*
  73  * This function is called during kernel startup to initialize
  74  * the mvme147 IRQ handling routines.
  75  */
  76
  77 void __init mvme147_init_IRQ(void)
  78 {
  79         m68k_setup_user_interrupt(VEC_USER, 192);
  80 }
  81
  82 void __init config_mvme147(void)
  83 {
  84         mach_max_dma_address    = 0x01000000;
  85         mach_sched_init         = mvme147_sched_init;
  86         mach_init_IRQ           = mvme147_init_IRQ;
  87         mach_hwclk              = mvme147_hwclk;
  88         mach_reset              = mvme147_reset;
  89         mach_get_model          = mvme147_get_model;
  90
  91         /* Board type is only set by newer versions of vmelilo/tftplilo */
  92         if (!vme_brdtype)
  93                 vme_brdtype = VME_TYPE_MVME147;
  94 }
  95
  96 static u64 mvme147_read_clk(struct clocksource *cs);
  97
  98 static struct clocksource mvme147_clk = {
  99         .name   = "pcc",
 100         .rating = 250,
 101         .read   = mvme147_read_clk,
 102         .mask   = CLOCKSOURCE_MASK(32),
 103         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
 104 };
 105
 106 static u32 clk_total;
 107
 108 #define PCC_TIMER_CLOCK_FREQ 160000
 109 #define PCC_TIMER_CYCLES     (PCC_TIMER_CLOCK_FREQ / HZ)
 110 #define PCC_TIMER_PRELOAD    (0x10000 - PCC_TIMER_CYCLES)
 111
 112 /* Using pcc tick timer 1 */
 113
 114 static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
 115 {
 116         irq_handler_t timer_routine = dev_id;
 117         unsigned long flags;
 118
 119         local_irq_save(flags);
 120         m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
 121         m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF;
 122         clk_total += PCC_TIMER_CYCLES;
 123         timer_routine(0, NULL);
 124         local_irq_restore(flags);
 125
 126         return IRQ_HANDLED;
 127 }
 128
 129
 130 void mvme147_sched_init (irq_handler_t timer_routine)
 131 {
 132         if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER,
 133                         "timer 1", timer_routine))
 134                 pr_err("Couldn't register timer interrupt\n");
 135
 136         /* Init the clock with a value */
 137         /* The clock counter increments until 0xFFFF then reloads */
 138         m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
 139         m147_pcc->t1_cntrl = 0x0;       /* clear timer */
 140         m147_pcc->t1_cntrl = 0x3;       /* start timer */
 141         m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;  /* clear pending ints */
 142         m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 143
 144         clocksource_register_hz(&mvme147_clk, PCC_TIMER_CLOCK_FREQ);
 145 }
 146
 147 static u64 mvme147_read_clk(struct clocksource *cs)
 148 {
 149         unsigned long flags;
 150         u8 overflow, tmp;
 151         u16 count;
 152         u32 ticks;
 153
 154         local_irq_save(flags);
 155         tmp = m147_pcc->t1_cntrl >> 4;
 156         count = m147_pcc->t1_count;
 157         overflow = m147_pcc->t1_cntrl >> 4;
 158         if (overflow != tmp)
 159                 count = m147_pcc->t1_count;
 160         count -= PCC_TIMER_PRELOAD;
 161         ticks = count + overflow * PCC_TIMER_CYCLES;
 162         ticks += clk_total;
 163         local_irq_restore(flags);
 164
 165         return ticks;
 166 }
 167
 168 static int bcd2int (unsigned char b)
 169 {
 170         return ((b>>4)*10 + (b&15));
 171 }
 172
 173 int mvme147_hwclk(int op, struct rtc_time *t)
 174 {
 175 #warning check me!
 176         if (!op) {
 177                 m147_rtc->ctrl = RTC_READ;
 178                 t->tm_year = bcd2int (m147_rtc->bcd_year);
 179                 t->tm_mon  = bcd2int(m147_rtc->bcd_mth) - 1;
 180                 t->tm_mday = bcd2int (m147_rtc->bcd_dom);
 181                 t->tm_hour = bcd2int (m147_rtc->bcd_hr);
 182                 t->tm_min  = bcd2int (m147_rtc->bcd_min);
 183                 t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
 184                 m147_rtc->ctrl = 0;
 185                 if (t->tm_year < 70)
 186                         t->tm_year += 100;
 187         }
 188         return 0;
 189 }