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/rtc.h>
  36 #include <asm/machdep.h>
  37 #include <asm/mvme147hw.h>
  38
  39
  40 static void mvme147_get_model(char *model);
  41 extern void mvme147_sched_init(irq_handler_t handler);
  42 extern u32 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
  47
  48 static int bcd2int (unsigned char b);
  49
  50 /* Save tick handler routine pointer, will point to xtime_update() in
  51  * kernel/time/timekeeping.c, called via mvme147_process_int() */
  52
  53 irq_handler_t tick_handler;
  54
  55
  56 int __init mvme147_parse_bootinfo(const struct bi_record *bi)
  57 {
  58         uint16_t tag = be16_to_cpu(bi->tag);
  59         if (tag == BI_VME_TYPE || 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  * This function is called during kernel startup to initialize
  81  * the mvme147 IRQ handling routines.
  82  */
  83
  84 void __init mvme147_init_IRQ(void)
  85 {
  86         m68k_setup_user_interrupt(VEC_USER, 192);
  87 }
  88
  89 void __init config_mvme147(void)
  90 {
  91         mach_max_dma_address    = 0x01000000;
  92         mach_sched_init         = mvme147_sched_init;
  93         mach_init_IRQ           = mvme147_init_IRQ;
  94         arch_gettimeoffset      = mvme147_gettimeoffset;
  95         mach_hwclk              = mvme147_hwclk;
  96         mach_set_clock_mmss     = mvme147_set_clock_mmss;
  97         mach_reset              = mvme147_reset;
  98         mach_get_model          = mvme147_get_model;
  99
 100         /* Board type is only set by newer versions of vmelilo/tftplilo */
 101         if (!vme_brdtype)
 102                 vme_brdtype = VME_TYPE_MVME147;
 103 }
 104
 105
 106 /* Using pcc tick timer 1 */
 107
 108 static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
 109 {
 110         m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
 111         m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 112         return tick_handler(irq, dev_id);
 113 }
 114
 115
 116 void mvme147_sched_init (irq_handler_t timer_routine)
 117 {
 118         tick_handler = timer_routine;
 119         if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, 0, "timer 1", NULL))
 120                 pr_err("Couldn't register timer interrupt\n");
 121
 122         /* Init the clock with a value */
 123         /* our clock goes off every 6.25us */
 124         m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
 125         m147_pcc->t1_cntrl = 0x0;       /* clear timer */
 126         m147_pcc->t1_cntrl = 0x3;       /* start timer */
 127         m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;  /* clear pending ints */
 128         m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 129 }
 130
 131 /* This is always executed with interrupts disabled.  */
 132 /* XXX There are race hazards in this code XXX */
 133 u32 mvme147_gettimeoffset(void)
 134 {
 135         volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012;
 136         unsigned short n;
 137
 138         n = *cp;
 139         while (n != *cp)
 140                 n = *cp;
 141
 142         n -= PCC_TIMER_PRELOAD;
 143         return ((unsigned long)n * 25 / 4) * 1000;
 144 }
 145
 146 static int bcd2int (unsigned char b)
 147 {
 148         return ((b>>4)*10 + (b&15));
 149 }
 150
 151 int mvme147_hwclk(int op, struct rtc_time *t)
 152 {
 153 #warning check me!
 154         if (!op) {
 155                 m147_rtc->ctrl = RTC_READ;
 156                 t->tm_year = bcd2int (m147_rtc->bcd_year);
 157                 t->tm_mon  = bcd2int (m147_rtc->bcd_mth);
 158                 t->tm_mday = bcd2int (m147_rtc->bcd_dom);
 159                 t->tm_hour = bcd2int (m147_rtc->bcd_hr);
 160                 t->tm_min  = bcd2int (m147_rtc->bcd_min);
 161                 t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
 162                 m147_rtc->ctrl = 0;
 163         }
 164         return 0;
 165 }
 166
 167 int mvme147_set_clock_mmss (unsigned long nowtime)
 168 {
 169         return 0;
 170 }
 171
 172 /*-------------------  Serial console stuff ------------------------*/
 173
 174 static void scc_delay (void)
 175 {
 176         int n;
 177         volatile int trash;
 178
 179         for (n = 0; n < 20; n++)
 180                 trash = n;
 181 }
 182
 183 static void scc_write (char ch)
 184 {
 185         volatile char *p = (volatile char *)M147_SCC_A_ADDR;
 186
 187         do {
 188                 scc_delay();
 189         }
 190         while (!(*p & 4));
 191         scc_delay();
 192         *p = 8;
 193         scc_delay();
 194         *p = ch;
 195 }
 196
 197
 198 void m147_scc_write (struct console *co, const char *str, unsigned count)
 199 {
 200         unsigned long flags;
 201
 202         local_irq_save(flags);
 203
 204         while (count--)
 205         {
 206                 if (*str == '\n')
 207                         scc_write ('\r');
 208                 scc_write (*str++);
 209         }
 210         local_irq_restore(flags);
 211 }
 212
 213 void mvme147_init_console_port (struct console *co, int cflag)
 214 {
 215         co->write    = m147_scc_write;
 216 }