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/pgtable.h> 30 #include <asm/setup.h> 31 #include <asm/irq.h> 32 #include <asm/traps.h> 33 #include <asm/rtc.h> 34 #include <asm/machdep.h> 35 #include <asm/mvme147hw.h> 36 37 38 static void mvme147_get_model(char *model); 39 extern void mvme147_sched_init(irq_handler_t handler); 40 extern u32 mvme147_gettimeoffset(void); 41 extern int mvme147_hwclk (int, struct rtc_time *); 42 extern int mvme147_set_clock_mmss (unsigned long); 43 extern void mvme147_reset (void); 44 45 46 static int bcd2int (unsigned char b); 47 48 /* Save tick handler routine pointer, will point to xtime_update() in 49 * kernel/time/timekeeping.c, called via mvme147_process_int() */ 50 51 irq_handler_t tick_handler; 52 53 54 int mvme147_parse_bootinfo(const struct bi_record *bi) 55 { 56 if (bi->tag == BI_VME_TYPE || bi->tag == BI_VME_BRDINFO) 57 return 0; 58 else 59 return 1; 60 } 61 62 void mvme147_reset(void) 63 { 64 printk ("\r\n\nCalled mvme147_reset\r\n"); 65 m147_pcc->watchdog = 0x0a; /* Clear timer */ 66 m147_pcc->watchdog = 0xa5; /* Enable watchdog - 100ms to reset */ 67 while (1) 68 ; 69 } 70 71 static void mvme147_get_model(char *model) 72 { 73 sprintf(model, "Motorola MVME147"); 74 } 75 76 /* 77 * This function is called during kernel startup to initialize 78 * the mvme147 IRQ handling routines. 79 */ 80 81 void __init mvme147_init_IRQ(void) 82 { 83 m68k_setup_user_interrupt(VEC_USER, 192); 84 } 85 86 void __init config_mvme147(void) 87 { 88 mach_max_dma_address = 0x01000000; 89 mach_sched_init = mvme147_sched_init; 90 mach_init_IRQ = mvme147_init_IRQ; 91 arch_gettimeoffset = mvme147_gettimeoffset; 92 mach_hwclk = mvme147_hwclk; 93 mach_set_clock_mmss = mvme147_set_clock_mmss; 94 mach_reset = mvme147_reset; 95 mach_get_model = mvme147_get_model; 96 97 /* Board type is only set by newer versions of vmelilo/tftplilo */ 98 if (!vme_brdtype) 99 vme_brdtype = VME_TYPE_MVME147; 100 } 101 102 103 /* Using pcc tick timer 1 */ 104 105 static irqreturn_t mvme147_timer_int (int irq, void *dev_id) 106 { 107 m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR; 108 m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1; 109 return tick_handler(irq, dev_id); 110 } 111 112 113 void mvme147_sched_init (irq_handler_t timer_routine) 114 { 115 tick_handler = timer_routine; 116 if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, 0, "timer 1", NULL)) 117 pr_err("Couldn't register timer interrupt\n"); 118 119 /* Init the clock with a value */ 120 /* our clock goes off every 6.25us */ 121 m147_pcc->t1_preload = PCC_TIMER_PRELOAD; 122 m147_pcc->t1_cntrl = 0x0; /* clear timer */ 123 m147_pcc->t1_cntrl = 0x3; /* start timer */ 124 m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR; /* clear pending ints */ 125 m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1; 126 } 127 128 /* This is always executed with interrupts disabled. */ 129 /* XXX There are race hazards in this code XXX */ 130 u32 mvme147_gettimeoffset(void) 131 { 132 volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012; 133 unsigned short n; 134 135 n = *cp; 136 while (n != *cp) 137 n = *cp; 138 139 n -= PCC_TIMER_PRELOAD; 140 return ((unsigned long)n * 25 / 4) * 1000; 141 } 142 143 static int bcd2int (unsigned char b) 144 { 145 return ((b>>4)*10 + (b&15)); 146 } 147 148 int mvme147_hwclk(int op, struct rtc_time *t) 149 { 150 #warning check me! 151 if (!op) { 152 m147_rtc->ctrl = RTC_READ; 153 t->tm_year = bcd2int (m147_rtc->bcd_year); 154 t->tm_mon = bcd2int (m147_rtc->bcd_mth); 155 t->tm_mday = bcd2int (m147_rtc->bcd_dom); 156 t->tm_hour = bcd2int (m147_rtc->bcd_hr); 157 t->tm_min = bcd2int (m147_rtc->bcd_min); 158 t->tm_sec = bcd2int (m147_rtc->bcd_sec); 159 m147_rtc->ctrl = 0; 160 } 161 return 0; 162 } 163 164 int mvme147_set_clock_mmss (unsigned long nowtime) 165 { 166 return 0; 167 } 168 169 /*------------------- Serial console stuff ------------------------*/ 170 171 static void scc_delay (void) 172 { 173 int n; 174 volatile int trash; 175 176 for (n = 0; n < 20; n++) 177 trash = n; 178 } 179 180 static void scc_write (char ch) 181 { 182 volatile char *p = (volatile char *)M147_SCC_A_ADDR; 183 184 do { 185 scc_delay(); 186 } 187 while (!(*p & 4)); 188 scc_delay(); 189 *p = 8; 190 scc_delay(); 191 *p = ch; 192 } 193 194 195 void m147_scc_write (struct console *co, const char *str, unsigned count) 196 { 197 unsigned long flags; 198 199 local_irq_save(flags); 200 201 while (count--) 202 { 203 if (*str == '\n') 204 scc_write ('\r'); 205 scc_write (*str++); 206 } 207 local_irq_restore(flags); 208 } 209 210 void mvme147_init_console_port (struct console *co, int cflag) 211 { 212 co->write = m147_scc_write; 213 } 214