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 } 217