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 static int  mvme147_get_hardware_list(char *buffer);
  41 extern void mvme147_sched_init(irq_handler_t handler);
  42 extern unsigned long mvme147_gettimeoffset (void);
  43 extern int mvme147_hwclk (int, struct rtc_time *);
  44 extern int mvme147_set_clock_mmss (unsigned long);
  45 extern void mvme147_reset (void);
  46 extern void mvme147_waitbut(void);
  47
  48
  49 static int bcd2int (unsigned char b);
  50
  51 /* Save tick handler routine pointer, will point to do_timer() in
  52  * kernel/sched.c, called via mvme147_process_int() */
  53
  54 irq_handler_t tick_handler;
  55
  56
  57 int mvme147_parse_bootinfo(const struct bi_record *bi)
  58 {
  59         if (bi->tag == BI_VME_TYPE || bi->tag == BI_VME_BRDINFO)
  60                 return 0;
  61         else
  62                 return 1;
  63 }
  64
  65 void mvme147_reset(void)
  66 {
  67         printk ("\r\n\nCalled mvme147_reset\r\n");
  68         m147_pcc->watchdog = 0x0a;      /* Clear timer */
  69         m147_pcc->watchdog = 0xa5;      /* Enable watchdog - 100ms to reset */
  70         while (1)
  71                 ;
  72 }
  73
  74 static void mvme147_get_model(char *model)
  75 {
  76         sprintf(model, "Motorola MVME147");
  77 }
  78
  79
  80 static int mvme147_get_hardware_list(char *buffer)
  81 {
  82         *buffer = '\0';
  83
  84         return 0;
  85 }
  86
  87 /*
  88  * This function is called during kernel startup to initialize
  89  * the mvme147 IRQ handling routines.
  90  */
  91
  92 void __init mvme147_init_IRQ(void)
  93 {
  94         m68k_setup_user_interrupt(VEC_USER, 192, NULL);
  95 }
  96
  97 void __init config_mvme147(void)
  98 {
  99         mach_max_dma_address    = 0x01000000;
 100         mach_sched_init         = mvme147_sched_init;
 101         mach_init_IRQ           = mvme147_init_IRQ;
 102         mach_gettimeoffset      = mvme147_gettimeoffset;
 103         mach_hwclk              = mvme147_hwclk;
 104         mach_set_clock_mmss     = mvme147_set_clock_mmss;
 105         mach_reset              = mvme147_reset;
 106         mach_get_model          = mvme147_get_model;
 107         mach_get_hardware_list  = mvme147_get_hardware_list;
 108
 109         /* Board type is only set by newer versions of vmelilo/tftplilo */
 110         if (!vme_brdtype)
 111                 vme_brdtype = VME_TYPE_MVME147;
 112 }
 113
 114
 115 /* Using pcc tick timer 1 */
 116
 117 static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
 118 {
 119         m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
 120         m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 121         return tick_handler(irq, dev_id);
 122 }
 123
 124
 125 void mvme147_sched_init (irq_handler_t timer_routine)
 126 {
 127         tick_handler = timer_routine;
 128         request_irq (PCC_IRQ_TIMER1, mvme147_timer_int,
 129                 IRQ_FLG_REPLACE, "timer 1", NULL);
 130
 131         /* Init the clock with a value */
 132         /* our clock goes off every 6.25us */
 133         m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
 134         m147_pcc->t1_cntrl = 0x0;       /* clear timer */
 135         m147_pcc->t1_cntrl = 0x3;       /* start timer */
 136         m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;  /* clear pending ints */
 137         m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 138 }
 139
 140 /* This is always executed with interrupts disabled.  */
 141 /* XXX There are race hazards in this code XXX */
 142 unsigned long mvme147_gettimeoffset (void)
 143 {
 144         volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012;
 145         unsigned short n;
 146
 147         n = *cp;
 148         while (n != *cp)
 149                 n = *cp;
 150
 151         n -= PCC_TIMER_PRELOAD;
 152         return (unsigned long)n * 25 / 4;
 153 }
 154
 155 static int bcd2int (unsigned char b)
 156 {
 157         return ((b>>4)*10 + (b&15));
 158 }
 159
 160 int mvme147_hwclk(int op, struct rtc_time *t)
 161 {
 162 #warning check me!
 163         if (!op) {
 164                 m147_rtc->ctrl = RTC_READ;
 165                 t->tm_year = bcd2int (m147_rtc->bcd_year);
 166                 t->tm_mon  = bcd2int (m147_rtc->bcd_mth);
 167                 t->tm_mday = bcd2int (m147_rtc->bcd_dom);
 168                 t->tm_hour = bcd2int (m147_rtc->bcd_hr);
 169                 t->tm_min  = bcd2int (m147_rtc->bcd_min);
 170                 t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
 171                 m147_rtc->ctrl = 0;
 172         }
 173         return 0;
 174 }
 175
 176 int mvme147_set_clock_mmss (unsigned long nowtime)
 177 {
 178         return 0;
 179 }
 180
 181 /*-------------------  Serial console stuff ------------------------*/
 182
 183 static void scc_delay (void)
 184 {
 185         int n;
 186         volatile int trash;
 187
 188         for (n = 0; n < 20; n++)
 189                 trash = n;
 190 }
 191
 192 static void scc_write (char ch)
 193 {
 194         volatile char *p = (volatile char *)M147_SCC_A_ADDR;
 195
 196         do {
 197                 scc_delay();
 198         }
 199         while (!(*p & 4));
 200         scc_delay();
 201         *p = 8;
 202         scc_delay();
 203         *p = ch;
 204 }
 205
 206
 207 void m147_scc_write (struct console *co, const char *str, unsigned count)
 208 {
 209         unsigned long flags;
 210
 211         local_irq_save(flags);
 212
 213         while (count--)
 214         {
 215                 if (*str == '\n')
 216                         scc_write ('\r');
 217                 scc_write (*str++);
 218         }
 219         local_irq_restore(flags);
 220 }
 221
 222 void mvme147_init_console_port (struct console *co, int cflag)
 223 {
 224         co->write    = m147_scc_write;
 225 }