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
  50 int __init mvme147_parse_bootinfo(const struct bi_record *bi)
  51 {
  52         uint16_t tag = be16_to_cpu(bi->tag);
  53         if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO)
  54                 return 0;
  55         else
  56                 return 1;
  57 }
  58
  59 void mvme147_reset(void)
  60 {
  61         pr_info("\r\n\nCalled mvme147_reset\r\n");
  62         m147_pcc->watchdog = 0x0a;      /* Clear timer */
  63         m147_pcc->watchdog = 0xa5;      /* Enable watchdog - 100ms to reset */
  64         while (1)
  65                 ;
  66 }
  67
  68 static void mvme147_get_model(char *model)
  69 {
  70         sprintf(model, "Motorola MVME147");
  71 }
  72
  73 /*
  74  * This function is called during kernel startup to initialize
  75  * the mvme147 IRQ handling routines.
  76  */
  77
  78 void __init mvme147_init_IRQ(void)
  79 {
  80         m68k_setup_user_interrupt(VEC_USER, 192);
  81 }
  82
  83 void __init config_mvme147(void)
  84 {
  85         mach_max_dma_address    = 0x01000000;
  86         mach_sched_init         = mvme147_sched_init;
  87         mach_init_IRQ           = mvme147_init_IRQ;
  88         arch_gettimeoffset      = mvme147_gettimeoffset;
  89         mach_hwclk              = mvme147_hwclk;
  90         mach_set_clock_mmss     = mvme147_set_clock_mmss;
  91         mach_reset              = mvme147_reset;
  92         mach_get_model          = mvme147_get_model;
  93
  94         /* Board type is only set by newer versions of vmelilo/tftplilo */
  95         if (!vme_brdtype)
  96                 vme_brdtype = VME_TYPE_MVME147;
  97 }
  98
  99
 100 /* Using pcc tick timer 1 */
 101
 102 static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
 103 {
 104         irq_handler_t timer_routine = dev_id;
 105         unsigned long flags;
 106
 107         local_irq_save(flags);
 108         m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
 109         m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 110         timer_routine(0, NULL);
 111         local_irq_restore(flags);
 112
 113         return IRQ_HANDLED;
 114 }
 115
 116
 117 void mvme147_sched_init (irq_handler_t timer_routine)
 118 {
 119         if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, 0, "timer 1",
 120                         timer_routine))
 121                 pr_err("Couldn't register timer interrupt\n");
 122
 123         /* Init the clock with a value */
 124         /* our clock goes off every 6.25us */
 125         m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
 126         m147_pcc->t1_cntrl = 0x0;       /* clear timer */
 127         m147_pcc->t1_cntrl = 0x3;       /* start timer */
 128         m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;  /* clear pending ints */
 129         m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 130 }
 131
 132 /* This is always executed with interrupts disabled.  */
 133 /* XXX There are race hazards in this code XXX */
 134 u32 mvme147_gettimeoffset(void)
 135 {
 136         volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012;
 137         unsigned short n;
 138
 139         n = *cp;
 140         while (n != *cp)
 141                 n = *cp;
 142
 143         n -= PCC_TIMER_PRELOAD;
 144         return ((unsigned long)n * 25 / 4) * 1000;
 145 }
 146
 147 static int bcd2int (unsigned char b)
 148 {
 149         return ((b>>4)*10 + (b&15));
 150 }
 151
 152 int mvme147_hwclk(int op, struct rtc_time *t)
 153 {
 154 #warning check me!
 155         if (!op) {
 156                 m147_rtc->ctrl = RTC_READ;
 157                 t->tm_year = bcd2int (m147_rtc->bcd_year);
 158                 t->tm_mon  = bcd2int (m147_rtc->bcd_mth);
 159                 t->tm_mday = bcd2int (m147_rtc->bcd_dom);
 160                 t->tm_hour = bcd2int (m147_rtc->bcd_hr);
 161                 t->tm_min  = bcd2int (m147_rtc->bcd_min);
 162                 t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
 163                 m147_rtc->ctrl = 0;
 164         }
 165         return 0;
 166 }
 167
 168 int mvme147_set_clock_mmss (unsigned long nowtime)
 169 {
 170         return 0;
 171 }