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
  39 static void mvme147_get_model(char *model);
  40 extern void mvme147_sched_init(irq_handler_t handler);
  41 extern u32 mvme147_gettimeoffset(void);
  42 extern int mvme147_hwclk (int, struct rtc_time *);
  43 extern int mvme147_set_clock_mmss (unsigned long);
  44 extern void mvme147_reset (void);
  45
  46
  47 static 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
  52 irq_handler_t tick_handler;
  53
  54
  55 int __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
  64 void 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
  73 static 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
  83 void __init mvme147_init_IRQ(void)
  84 {
  85         m68k_setup_user_interrupt(VEC_USER, 192);
  86 }
  87
  88 void __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
 107 static 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
 115 void 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 */
 132 u32 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
 145 static int bcd2int (unsigned char b)
 146 {
 147         return ((b>>4)*10 + (b&15));
 148 }
 149
 150 int 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
 166 int mvme147_set_clock_mmss (unsigned long nowtime)
 167 {
 168         return 0;
 169 }