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/clocksource.h> 21 #include <linux/console.h> 22 #include <linux/linkage.h> 23 #include <linux/init.h> 24 #include <linux/major.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/setup.h> 32 #include <asm/irq.h> 33 #include <asm/traps.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(void); 40 extern int mvme147_hwclk (int, struct rtc_time *); 41 extern void mvme147_reset (void); 42 43 44 static int bcd2int (unsigned char b); 45 46 47 int __init mvme147_parse_bootinfo(const struct bi_record *bi) 48 { 49 uint16_t tag = be16_to_cpu(bi->tag); 50 if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO) 51 return 0; 52 else 53 return 1; 54 } 55 56 void mvme147_reset(void) 57 { 58 pr_info("\r\n\nCalled mvme147_reset\r\n"); 59 m147_pcc->watchdog = 0x0a; /* Clear timer */ 60 m147_pcc->watchdog = 0xa5; /* Enable watchdog - 100ms to reset */ 61 while (1) 62 ; 63 } 64 65 static void mvme147_get_model(char *model) 66 { 67 sprintf(model, "Motorola MVME147"); 68 } 69 70 /* 71 * This function is called during kernel startup to initialize 72 * the mvme147 IRQ handling routines. 73 */ 74 75 void __init mvme147_init_IRQ(void) 76 { 77 m68k_setup_user_interrupt(VEC_USER, 192); 78 } 79 80 void __init config_mvme147(void) 81 { 82 mach_sched_init = mvme147_sched_init; 83 mach_init_IRQ = mvme147_init_IRQ; 84 mach_hwclk = mvme147_hwclk; 85 mach_reset = mvme147_reset; 86 mach_get_model = mvme147_get_model; 87 88 /* Board type is only set by newer versions of vmelilo/tftplilo */ 89 if (!vme_brdtype) 90 vme_brdtype = VME_TYPE_MVME147; 91 } 92 93 static u64 mvme147_read_clk(struct clocksource *cs); 94 95 static struct clocksource mvme147_clk = { 96 .name = "pcc", 97 .rating = 250, 98 .read = mvme147_read_clk, 99 .mask = CLOCKSOURCE_MASK(32), 100 .flags = CLOCK_SOURCE_IS_CONTINUOUS, 101 }; 102 103 static u32 clk_total; 104 105 #define PCC_TIMER_CLOCK_FREQ 160000 106 #define PCC_TIMER_CYCLES (PCC_TIMER_CLOCK_FREQ / HZ) 107 #define PCC_TIMER_PRELOAD (0x10000 - PCC_TIMER_CYCLES) 108 109 /* Using pcc tick timer 1 */ 110 111 static irqreturn_t mvme147_timer_int (int irq, void *dev_id) 112 { 113 unsigned long flags; 114 115 local_irq_save(flags); 116 m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN | 117 PCC_TIMER_TIC_EN; 118 m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR | 119 PCC_LEVEL_TIMER1; 120 clk_total += PCC_TIMER_CYCLES; 121 legacy_timer_tick(1); 122 local_irq_restore(flags); 123 124 return IRQ_HANDLED; 125 } 126 127 128 void mvme147_sched_init (void) 129 { 130 if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER, 131 "timer 1", NULL)) 132 pr_err("Couldn't register timer interrupt\n"); 133 134 /* Init the clock with a value */ 135 /* The clock counter increments until 0xFFFF then reloads */ 136 m147_pcc->t1_preload = PCC_TIMER_PRELOAD; 137 m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN | 138 PCC_TIMER_TIC_EN; 139 m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR | 140 PCC_LEVEL_TIMER1; 141 142 clocksource_register_hz(&mvme147_clk, PCC_TIMER_CLOCK_FREQ); 143 } 144 145 static u64 mvme147_read_clk(struct clocksource *cs) 146 { 147 unsigned long flags; 148 u8 overflow, tmp; 149 u16 count; 150 u32 ticks; 151 152 local_irq_save(flags); 153 tmp = m147_pcc->t1_cntrl >> 4; 154 count = m147_pcc->t1_count; 155 overflow = m147_pcc->t1_cntrl >> 4; 156 if (overflow != tmp) 157 count = m147_pcc->t1_count; 158 count -= PCC_TIMER_PRELOAD; 159 ticks = count + overflow * PCC_TIMER_CYCLES; 160 ticks += clk_total; 161 local_irq_restore(flags); 162 163 return ticks; 164 } 165 166 static int bcd2int (unsigned char b) 167 { 168 return ((b>>4)*10 + (b&15)); 169 } 170 171 int mvme147_hwclk(int op, struct rtc_time *t) 172 { 173 if (!op) { 174 m147_rtc->ctrl = RTC_READ; 175 t->tm_year = bcd2int (m147_rtc->bcd_year); 176 t->tm_mon = bcd2int(m147_rtc->bcd_mth) - 1; 177 t->tm_mday = bcd2int (m147_rtc->bcd_dom); 178 t->tm_hour = bcd2int (m147_rtc->bcd_hr); 179 t->tm_min = bcd2int (m147_rtc->bcd_min); 180 t->tm_sec = bcd2int (m147_rtc->bcd_sec); 181 m147_rtc->ctrl = 0; 182 if (t->tm_year < 70) 183 t->tm_year += 100; 184 } else { 185 /* FIXME Setting the time is not yet supported */ 186 return -EOPNOTSUPP; 187 } 188 return 0; 189 } 190