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/system.h>
  30 #include <asm/pgtable.h>
  31 #include <asm/setup.h>
  32 #include <asm/irq.h>
  33 #include <asm/traps.h>
  34 #include <asm/rtc.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 unsigned long 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 do_timer() in
  50  * kernel/sched.c, called via mvme147_process_int() */
  51
  52 irq_handler_t tick_handler;
  53
  54
  55 int mvme147_parse_bootinfo(const struct bi_record *bi)
  56 {
  57         if (bi->tag == BI_VME_TYPE || bi->tag == BI_VME_BRDINFO)
  58                 return 0;
  59         else
  60                 return 1;
  61 }
  62
  63 void mvme147_reset(void)
  64 {
  65         printk ("\r\n\nCalled mvme147_reset\r\n");
  66         m147_pcc->watchdog = 0x0a;      /* Clear timer */
  67         m147_pcc->watchdog = 0xa5;      /* Enable watchdog - 100ms to reset */
  68         while (1)
  69                 ;
  70 }
  71
  72 static void mvme147_get_model(char *model)
  73 {
  74         sprintf(model, "Motorola MVME147");
  75 }
  76
  77 /*
  78  * This function is called during kernel startup to initialize
  79  * the mvme147 IRQ handling routines.
  80  */
  81
  82 void __init mvme147_init_IRQ(void)
  83 {
  84         m68k_setup_user_interrupt(VEC_USER, 192, NULL);
  85 }
  86
  87 void __init config_mvme147(void)
  88 {
  89         mach_max_dma_address    = 0x01000000;
  90         mach_sched_init         = mvme147_sched_init;
  91         mach_init_IRQ           = mvme147_init_IRQ;
  92         mach_gettimeoffset      = mvme147_gettimeoffset;
  93         mach_hwclk              = mvme147_hwclk;
  94         mach_set_clock_mmss     = mvme147_set_clock_mmss;
  95         mach_reset              = mvme147_reset;
  96         mach_get_model          = mvme147_get_model;
  97
  98         /* Board type is only set by newer versions of vmelilo/tftplilo */
  99         if (!vme_brdtype)
 100                 vme_brdtype = VME_TYPE_MVME147;
 101 }
 102
 103
 104 /* Using pcc tick timer 1 */
 105
 106 static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
 107 {
 108         m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
 109         m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 110         return tick_handler(irq, dev_id);
 111 }
 112
 113
 114 void mvme147_sched_init (irq_handler_t timer_routine)
 115 {
 116         tick_handler = timer_routine;
 117         if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQ_FLG_REPLACE,
 118                         "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 unsigned long 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;
 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 }
 170
 171 /*-------------------  Serial console stuff ------------------------*/
 172
 173 static void scc_delay (void)
 174 {
 175         int n;
 176         volatile int trash;
 177
 178         for (n = 0; n < 20; n++)
 179                 trash = n;
 180 }
 181
 182 static void scc_write (char ch)
 183 {
 184         volatile char *p = (volatile char *)M147_SCC_A_ADDR;
 185
 186         do {
 187                 scc_delay();
 188         }
 189         while (!(*p & 4));
 190         scc_delay();
 191         *p = 8;
 192         scc_delay();
 193         *p = ch;
 194 }
 195
 196
 197 void m147_scc_write (struct console *co, const char *str, unsigned count)
 198 {
 199         unsigned long flags;
 200
 201         local_irq_save(flags);
 202
 203         while (count--)
 204         {
 205                 if (*str == '\n')
 206                         scc_write ('\r');
 207                 scc_write (*str++);
 208         }
 209         local_irq_restore(flags);
 210 }
 211
 212 void mvme147_init_console_port (struct console *co, int cflag)
 213 {
 214         co->write    = m147_scc_write;
 215 }