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 xtime_update() in 50 * kernel/time/timekeeping.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); 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, 0, "timer 1", NULL)) 118 pr_err("Couldn't register timer interrupt\n"); 119 120 /* Init the clock with a value */ 121 /* our clock goes off every 6.25us */ 122 m147_pcc->t1_preload = PCC_TIMER_PRELOAD; 123 m147_pcc->t1_cntrl = 0x0; /* clear timer */ 124 m147_pcc->t1_cntrl = 0x3; /* start timer */ 125 m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR; /* clear pending ints */ 126 m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1; 127 } 128 129 /* This is always executed with interrupts disabled. */ 130 /* XXX There are race hazards in this code XXX */ 131 unsigned long mvme147_gettimeoffset (void) 132 { 133 volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012; 134 unsigned short n; 135 136 n = *cp; 137 while (n != *cp) 138 n = *cp; 139 140 n -= PCC_TIMER_PRELOAD; 141 return (unsigned long)n * 25 / 4; 142 } 143 144 static int bcd2int (unsigned char b) 145 { 146 return ((b>>4)*10 + (b&15)); 147 } 148 149 int mvme147_hwclk(int op, struct rtc_time *t) 150 { 151 #warning check me! 152 if (!op) { 153 m147_rtc->ctrl = RTC_READ; 154 t->tm_year = bcd2int (m147_rtc->bcd_year); 155 t->tm_mon = bcd2int (m147_rtc->bcd_mth); 156 t->tm_mday = bcd2int (m147_rtc->bcd_dom); 157 t->tm_hour = bcd2int (m147_rtc->bcd_hr); 158 t->tm_min = bcd2int (m147_rtc->bcd_min); 159 t->tm_sec = bcd2int (m147_rtc->bcd_sec); 160 m147_rtc->ctrl = 0; 161 } 162 return 0; 163 } 164 165 int mvme147_set_clock_mmss (unsigned long nowtime) 166 { 167 return 0; 168 } 169 170 /*------------------- Serial console stuff ------------------------*/ 171 172 static void scc_delay (void) 173 { 174 int n; 175 volatile int trash; 176 177 for (n = 0; n < 20; n++) 178 trash = n; 179 } 180 181 static void scc_write (char ch) 182 { 183 volatile char *p = (volatile char *)M147_SCC_A_ADDR; 184 185 do { 186 scc_delay(); 187 } 188 while (!(*p & 4)); 189 scc_delay(); 190 *p = 8; 191 scc_delay(); 192 *p = ch; 193 } 194 195 196 void m147_scc_write (struct console *co, const char *str, unsigned count) 197 { 198 unsigned long flags; 199 200 local_irq_save(flags); 201 202 while (count--) 203 { 204 if (*str == '\n') 205 scc_write ('\r'); 206 scc_write (*str++); 207 } 208 local_irq_restore(flags); 209 } 210 211 void mvme147_init_console_port (struct console *co, int cflag) 212 { 213 co->write = m147_scc_write; 214 } 215