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/pgtable.h>
  30 #include <asm/setup.h>
  31 #include <asm/irq.h>
  32 #include <asm/traps.h>
  33 #include <asm/rtc.h>
  34 #include <asm/machdep.h>
  35 #include <asm/mvme147hw.h>
  36
  37
  38 static void mvme147_get_model(char *model);
  39 extern void mvme147_sched_init(irq_handler_t handler);
  40 extern unsigned long mvme147_gettimeoffset (void);
  41 extern int mvme147_hwclk (int, struct rtc_time *);
  42 extern int mvme147_set_clock_mmss (unsigned long);
  43 extern void mvme147_reset (void);
  44
  45
  46 static int bcd2int (unsigned char b);
  47
  48 /* Save tick handler routine pointer, will point to xtime_update() in
  49  * kernel/time/timekeeping.c, called via mvme147_process_int() */
  50
  51 irq_handler_t tick_handler;
  52
  53
  54 int mvme147_parse_bootinfo(const struct bi_record *bi)
  55 {
  56         if (bi->tag == BI_VME_TYPE || bi->tag == BI_VME_BRDINFO)
  57                 return 0;
  58         else
  59                 return 1;
  60 }
  61
  62 void mvme147_reset(void)
  63 {
  64         printk ("\r\n\nCalled mvme147_reset\r\n");
  65         m147_pcc->watchdog = 0x0a;      /* Clear timer */
  66         m147_pcc->watchdog = 0xa5;      /* Enable watchdog - 100ms to reset */
  67         while (1)
  68                 ;
  69 }
  70
  71 static void mvme147_get_model(char *model)
  72 {
  73         sprintf(model, "Motorola MVME147");
  74 }
  75
  76 /*
  77  * This function is called during kernel startup to initialize
  78  * the mvme147 IRQ handling routines.
  79  */
  80
  81 void __init mvme147_init_IRQ(void)
  82 {
  83         m68k_setup_user_interrupt(VEC_USER, 192);
  84 }
  85
  86 void __init config_mvme147(void)
  87 {
  88         mach_max_dma_address    = 0x01000000;
  89         mach_sched_init         = mvme147_sched_init;
  90         mach_init_IRQ           = mvme147_init_IRQ;
  91         mach_gettimeoffset      = mvme147_gettimeoffset;
  92         mach_hwclk              = mvme147_hwclk;
  93         mach_set_clock_mmss     = mvme147_set_clock_mmss;
  94         mach_reset              = mvme147_reset;
  95         mach_get_model          = mvme147_get_model;
  96
  97         /* Board type is only set by newer versions of vmelilo/tftplilo */
  98         if (!vme_brdtype)
  99                 vme_brdtype = VME_TYPE_MVME147;
 100 }
 101
 102
 103 /* Using pcc tick timer 1 */
 104
 105 static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
 106 {
 107         m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
 108         m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 109         return tick_handler(irq, dev_id);
 110 }
 111
 112
 113 void mvme147_sched_init (irq_handler_t timer_routine)
 114 {
 115         tick_handler = timer_routine;
 116         if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, 0, "timer 1", NULL))
 117                 pr_err("Couldn't register timer interrupt\n");
 118
 119         /* Init the clock with a value */
 120         /* our clock goes off every 6.25us */
 121         m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
 122         m147_pcc->t1_cntrl = 0x0;       /* clear timer */
 123         m147_pcc->t1_cntrl = 0x3;       /* start timer */
 124         m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;  /* clear pending ints */
 125         m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 126 }
 127
 128 /* This is always executed with interrupts disabled.  */
 129 /* XXX There are race hazards in this code XXX */
 130 unsigned long mvme147_gettimeoffset (void)
 131 {
 132         volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012;
 133         unsigned short n;
 134
 135         n = *cp;
 136         while (n != *cp)
 137                 n = *cp;
 138
 139         n -= PCC_TIMER_PRELOAD;
 140         return (unsigned long)n * 25 / 4;
 141 }
 142
 143 static int bcd2int (unsigned char b)
 144 {
 145         return ((b>>4)*10 + (b&15));
 146 }
 147
 148 int mvme147_hwclk(int op, struct rtc_time *t)
 149 {
 150 #warning check me!
 151         if (!op) {
 152                 m147_rtc->ctrl = RTC_READ;
 153                 t->tm_year = bcd2int (m147_rtc->bcd_year);
 154                 t->tm_mon  = bcd2int (m147_rtc->bcd_mth);
 155                 t->tm_mday = bcd2int (m147_rtc->bcd_dom);
 156                 t->tm_hour = bcd2int (m147_rtc->bcd_hr);
 157                 t->tm_min  = bcd2int (m147_rtc->bcd_min);
 158                 t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
 159                 m147_rtc->ctrl = 0;
 160         }
 161         return 0;
 162 }
 163
 164 int mvme147_set_clock_mmss (unsigned long nowtime)
 165 {
 166         return 0;
 167 }
 168
 169 /*-------------------  Serial console stuff ------------------------*/
 170
 171 static void scc_delay (void)
 172 {
 173         int n;
 174         volatile int trash;
 175
 176         for (n = 0; n < 20; n++)
 177                 trash = n;
 178 }
 179
 180 static void scc_write (char ch)
 181 {
 182         volatile char *p = (volatile char *)M147_SCC_A_ADDR;
 183
 184         do {
 185                 scc_delay();
 186         }
 187         while (!(*p & 4));
 188         scc_delay();
 189         *p = 8;
 190         scc_delay();
 191         *p = ch;
 192 }
 193
 194
 195 void m147_scc_write (struct console *co, const char *str, unsigned count)
 196 {
 197         unsigned long flags;
 198
 199         local_irq_save(flags);
 200
 201         while (count--)
 202         {
 203                 if (*str == '\n')
 204                         scc_write ('\r');
 205                 scc_write (*str++);
 206         }
 207         local_irq_restore(flags);
 208 }
 209
 210 void mvme147_init_console_port (struct console *co, int cflag)
 211 {
 212         co->write    = m147_scc_write;
 213 }