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 static int mvme147_get_hardware_list(char *buffer); 41 extern void mvme147_sched_init(irq_handler_t handler); 42 extern unsigned long 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 extern void mvme147_waitbut(void); 47 48 49 static int bcd2int (unsigned char b); 50 51 /* Save tick handler routine pointer, will point to do_timer() in 52 * kernel/sched.c, called via mvme147_process_int() */ 53 54 irq_handler_t tick_handler; 55 56 57 int mvme147_parse_bootinfo(const struct bi_record *bi) 58 { 59 if (bi->tag == BI_VME_TYPE || bi->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 static int mvme147_get_hardware_list(char *buffer) 81 { 82 *buffer = '\0'; 83 84 return 0; 85 } 86 87 /* 88 * This function is called during kernel startup to initialize 89 * the mvme147 IRQ handling routines. 90 */ 91 92 void __init mvme147_init_IRQ(void) 93 { 94 m68k_setup_user_interrupt(VEC_USER, 192, NULL); 95 } 96 97 void __init config_mvme147(void) 98 { 99 mach_max_dma_address = 0x01000000; 100 mach_sched_init = mvme147_sched_init; 101 mach_init_IRQ = mvme147_init_IRQ; 102 mach_gettimeoffset = mvme147_gettimeoffset; 103 mach_hwclk = mvme147_hwclk; 104 mach_set_clock_mmss = mvme147_set_clock_mmss; 105 mach_reset = mvme147_reset; 106 mach_get_model = mvme147_get_model; 107 mach_get_hardware_list = mvme147_get_hardware_list; 108 109 /* Board type is only set by newer versions of vmelilo/tftplilo */ 110 if (!vme_brdtype) 111 vme_brdtype = VME_TYPE_MVME147; 112 } 113 114 115 /* Using pcc tick timer 1 */ 116 117 static irqreturn_t mvme147_timer_int (int irq, void *dev_id) 118 { 119 m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR; 120 m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1; 121 return tick_handler(irq, dev_id); 122 } 123 124 125 void mvme147_sched_init (irq_handler_t timer_routine) 126 { 127 tick_handler = timer_routine; 128 request_irq (PCC_IRQ_TIMER1, mvme147_timer_int, 129 IRQ_FLG_REPLACE, "timer 1", NULL); 130 131 /* Init the clock with a value */ 132 /* our clock goes off every 6.25us */ 133 m147_pcc->t1_preload = PCC_TIMER_PRELOAD; 134 m147_pcc->t1_cntrl = 0x0; /* clear timer */ 135 m147_pcc->t1_cntrl = 0x3; /* start timer */ 136 m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR; /* clear pending ints */ 137 m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1; 138 } 139 140 /* This is always executed with interrupts disabled. */ 141 /* XXX There are race hazards in this code XXX */ 142 unsigned long mvme147_gettimeoffset (void) 143 { 144 volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012; 145 unsigned short n; 146 147 n = *cp; 148 while (n != *cp) 149 n = *cp; 150 151 n -= PCC_TIMER_PRELOAD; 152 return (unsigned long)n * 25 / 4; 153 } 154 155 static int bcd2int (unsigned char b) 156 { 157 return ((b>>4)*10 + (b&15)); 158 } 159 160 int mvme147_hwclk(int op, struct rtc_time *t) 161 { 162 #warning check me! 163 if (!op) { 164 m147_rtc->ctrl = RTC_READ; 165 t->tm_year = bcd2int (m147_rtc->bcd_year); 166 t->tm_mon = bcd2int (m147_rtc->bcd_mth); 167 t->tm_mday = bcd2int (m147_rtc->bcd_dom); 168 t->tm_hour = bcd2int (m147_rtc->bcd_hr); 169 t->tm_min = bcd2int (m147_rtc->bcd_min); 170 t->tm_sec = bcd2int (m147_rtc->bcd_sec); 171 m147_rtc->ctrl = 0; 172 } 173 return 0; 174 } 175 176 int mvme147_set_clock_mmss (unsigned long nowtime) 177 { 178 return 0; 179 } 180 181 /*------------------- Serial console stuff ------------------------*/ 182 183 static void scc_delay (void) 184 { 185 int n; 186 volatile int trash; 187 188 for (n = 0; n < 20; n++) 189 trash = n; 190 } 191 192 static void scc_write (char ch) 193 { 194 volatile char *p = (volatile char *)M147_SCC_A_ADDR; 195 196 do { 197 scc_delay(); 198 } 199 while (!(*p & 4)); 200 scc_delay(); 201 *p = 8; 202 scc_delay(); 203 *p = ch; 204 } 205 206 207 void m147_scc_write (struct console *co, const char *str, unsigned count) 208 { 209 unsigned long flags; 210 211 local_irq_save(flags); 212 213 while (count--) 214 { 215 if (*str == '\n') 216 scc_write ('\r'); 217 scc_write (*str++); 218 } 219 local_irq_restore(flags); 220 } 221 222 void mvme147_init_console_port (struct console *co, int cflag) 223 { 224 co->write = m147_scc_write; 225 } 226