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 extern irqreturn_t mvme147_process_int (int level, struct pt_regs *regs);
  40 extern void mvme147_init_IRQ (void);
  41 extern void mvme147_free_irq (unsigned int, void *);
  42 extern int  show_mvme147_interrupts (struct seq_file *, void *);
  43 extern void mvme147_enable_irq (unsigned int);
  44 extern void mvme147_disable_irq (unsigned int);
  45 static void mvme147_get_model(char *model);
  46 static int  mvme147_get_hardware_list(char *buffer);
  47 extern int mvme147_request_irq (unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *), unsigned long flags, const char *devname, void *dev_id);
  48 extern void mvme147_sched_init(irqreturn_t (*handler)(int, void *, struct pt_regs *));
  49 extern unsigned long mvme147_gettimeoffset (void);
  50 extern int mvme147_hwclk (int, struct rtc_time *);
  51 extern int mvme147_set_clock_mmss (unsigned long);
  52 extern void mvme147_reset (void);
  53 extern void mvme147_waitbut(void);
  54
  55
  56 static int bcd2int (unsigned char b);
  57
  58 /* Save tick handler routine pointer, will point to do_timer() in
  59  * kernel/sched.c, called via mvme147_process_int() */
  60
  61 irqreturn_t (*tick_handler)(int, void *, struct pt_regs *);
  62
  63
  64 int mvme147_parse_bootinfo(const struct bi_record *bi)
  65 {
  66         if (bi->tag == BI_VME_TYPE || bi->tag == BI_VME_BRDINFO)
  67                 return 0;
  68         else
  69                 return 1;
  70 }
  71
  72 void mvme147_reset(void)
  73 {
  74         printk ("\r\n\nCalled mvme147_reset\r\n");
  75         m147_pcc->watchdog = 0x0a;      /* Clear timer */
  76         m147_pcc->watchdog = 0xa5;      /* Enable watchdog - 100ms to reset */
  77         while (1)
  78                 ;
  79 }
  80
  81 static void mvme147_get_model(char *model)
  82 {
  83         sprintf(model, "Motorola MVME147");
  84 }
  85
  86
  87 static int mvme147_get_hardware_list(char *buffer)
  88 {
  89         *buffer = '\0';
  90
  91         return 0;
  92 }
  93
  94
  95 void __init config_mvme147(void)
  96 {
  97         mach_max_dma_address    = 0x01000000;
  98         mach_sched_init         = mvme147_sched_init;
  99         mach_init_IRQ           = mvme147_init_IRQ;
 100         mach_gettimeoffset      = mvme147_gettimeoffset;
 101         mach_hwclk              = mvme147_hwclk;
 102         mach_set_clock_mmss     = mvme147_set_clock_mmss;
 103         mach_reset              = mvme147_reset;
 104         mach_free_irq           = mvme147_free_irq;
 105         mach_process_int        = mvme147_process_int;
 106         mach_get_irq_list       = show_mvme147_interrupts;
 107         mach_request_irq        = mvme147_request_irq;
 108         enable_irq              = mvme147_enable_irq;
 109         disable_irq             = mvme147_disable_irq;
 110         mach_get_model          = mvme147_get_model;
 111         mach_get_hardware_list  = mvme147_get_hardware_list;
 112
 113         /* Board type is only set by newer versions of vmelilo/tftplilo */
 114         if (!vme_brdtype)
 115                 vme_brdtype = VME_TYPE_MVME147;
 116 }
 117
 118
 119 /* Using pcc tick timer 1 */
 120
 121 static irqreturn_t mvme147_timer_int (int irq, void *dev_id, struct pt_regs *fp)
 122 {
 123         m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
 124         m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 125         return tick_handler(irq, dev_id, fp);
 126 }
 127
 128
 129 void mvme147_sched_init (irqreturn_t (*timer_routine)(int, void *, struct pt_regs *))
 130 {
 131         tick_handler = timer_routine;
 132         request_irq (PCC_IRQ_TIMER1, mvme147_timer_int,
 133                 IRQ_FLG_REPLACE, "timer 1", NULL);
 134
 135         /* Init the clock with a value */
 136         /* our clock goes off every 6.25us */
 137         m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
 138         m147_pcc->t1_cntrl = 0x0;       /* clear timer */
 139         m147_pcc->t1_cntrl = 0x3;       /* start timer */
 140         m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;  /* clear pending ints */
 141         m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
 142 }
 143
 144 /* This is always executed with interrupts disabled.  */
 145 /* XXX There are race hazards in this code XXX */
 146 unsigned long mvme147_gettimeoffset (void)
 147 {
 148         volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012;
 149         unsigned short n;
 150
 151         n = *cp;
 152         while (n != *cp)
 153                 n = *cp;
 154
 155         n -= PCC_TIMER_PRELOAD;
 156         return (unsigned long)n * 25 / 4;
 157 }
 158
 159 static int bcd2int (unsigned char b)
 160 {
 161         return ((b>>4)*10 + (b&15));
 162 }
 163
 164 int mvme147_hwclk(int op, struct rtc_time *t)
 165 {
 166 #warning check me!
 167         if (!op) {
 168                 m147_rtc->ctrl = RTC_READ;
 169                 t->tm_year = bcd2int (m147_rtc->bcd_year);
 170                 t->tm_mon  = bcd2int (m147_rtc->bcd_mth);
 171                 t->tm_mday = bcd2int (m147_rtc->bcd_dom);
 172                 t->tm_hour = bcd2int (m147_rtc->bcd_hr);
 173                 t->tm_min  = bcd2int (m147_rtc->bcd_min);
 174                 t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
 175                 m147_rtc->ctrl = 0;
 176         }
 177         return 0;
 178 }
 179
 180 int mvme147_set_clock_mmss (unsigned long nowtime)
 181 {
 182         return 0;
 183 }
 184
 185 /*-------------------  Serial console stuff ------------------------*/
 186
 187 static void scc_delay (void)
 188 {
 189         int n;
 190         volatile int trash;
 191
 192         for (n = 0; n < 20; n++)
 193                 trash = n;
 194 }
 195
 196 static void scc_write (char ch)
 197 {
 198         volatile char *p = (volatile char *)M147_SCC_A_ADDR;
 199
 200         do {
 201                 scc_delay();
 202         }
 203         while (!(*p & 4));
 204         scc_delay();
 205         *p = 8;
 206         scc_delay();
 207         *p = ch;
 208 }
 209
 210
 211 void m147_scc_write (struct console *co, const char *str, unsigned count)
 212 {
 213         unsigned long flags;
 214
 215         local_irq_save(flags);
 216
 217         while (count--)
 218         {
 219                 if (*str == '\n')
 220                         scc_write ('\r');
 221                 scc_write (*str++);
 222         }
 223         local_irq_restore(flags);
 224 }
 225
 226 void mvme147_init_console_port (struct console *co, int cflag)
 227 {
 228         co->write    = m147_scc_write;
 229 }