1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * arch/m68k/mvme147/config.c 4 * 5 * Copyright (C) 1996 Dave Frascone [chaos@mindspring.com] 6 * Cloned from Richard Hirst [richard@sleepie.demon.co.uk] 7 * 8 * Based on: 9 * 10 * Copyright (C) 1993 Hamish Macdonald 11 */ 12 13 #include <linux/types.h> 14 #include <linux/kernel.h> 15 #include <linux/mm.h> 16 #include <linux/tty.h> 17 #include <linux/clocksource.h> 18 #include <linux/console.h> 19 #include <linux/linkage.h> 20 #include <linux/init.h> 21 #include <linux/major.h> 22 #include <linux/rtc.h> 23 #include <linux/interrupt.h> 24 25 #include <asm/bootinfo.h> 26 #include <asm/bootinfo-vme.h> 27 #include <asm/byteorder.h> 28 #include <asm/setup.h> 29 #include <asm/irq.h> 30 #include <asm/traps.h> 31 #include <asm/machdep.h> 32 #include <asm/mvme147hw.h> 33 #include <asm/config.h> 34 35 36 static void mvme147_get_model(char *model); 37 extern void mvme147_sched_init(void); 38 extern int mvme147_hwclk (int, struct rtc_time *); 39 extern void mvme147_reset (void); 40 41 42 static int bcd2int (unsigned char b); 43 44 45 int __init mvme147_parse_bootinfo(const struct bi_record *bi) 46 { 47 uint16_t tag = be16_to_cpu(bi->tag); 48 if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO) 49 return 0; 50 else 51 return 1; 52 } 53 54 void mvme147_reset(void) 55 { 56 pr_info("\r\n\nCalled mvme147_reset\r\n"); 57 m147_pcc->watchdog = 0x0a; /* Clear timer */ 58 m147_pcc->watchdog = 0xa5; /* Enable watchdog - 100ms to reset */ 59 while (1) 60 ; 61 } 62 63 static void mvme147_get_model(char *model) 64 { 65 sprintf(model, "Motorola MVME147"); 66 } 67 68 /* 69 * This function is called during kernel startup to initialize 70 * the mvme147 IRQ handling routines. 71 */ 72 73 static void __init mvme147_init_IRQ(void) 74 { 75 m68k_setup_user_interrupt(VEC_USER, 192); 76 } 77 78 void __init config_mvme147(void) 79 { 80 mach_sched_init = mvme147_sched_init; 81 mach_init_IRQ = mvme147_init_IRQ; 82 mach_hwclk = mvme147_hwclk; 83 mach_reset = mvme147_reset; 84 mach_get_model = mvme147_get_model; 85 86 /* Board type is only set by newer versions of vmelilo/tftplilo */ 87 if (!vme_brdtype) 88 vme_brdtype = VME_TYPE_MVME147; 89 } 90 91 static u64 mvme147_read_clk(struct clocksource *cs); 92 93 static struct clocksource mvme147_clk = { 94 .name = "pcc", 95 .rating = 250, 96 .read = mvme147_read_clk, 97 .mask = CLOCKSOURCE_MASK(32), 98 .flags = CLOCK_SOURCE_IS_CONTINUOUS, 99 }; 100 101 static u32 clk_total; 102 103 #define PCC_TIMER_CLOCK_FREQ 160000 104 #define PCC_TIMER_CYCLES (PCC_TIMER_CLOCK_FREQ / HZ) 105 #define PCC_TIMER_PRELOAD (0x10000 - PCC_TIMER_CYCLES) 106 107 /* Using pcc tick timer 1 */ 108 109 static irqreturn_t mvme147_timer_int (int irq, void *dev_id) 110 { 111 unsigned long flags; 112 113 local_irq_save(flags); 114 m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN | 115 PCC_TIMER_TIC_EN; 116 m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR | 117 PCC_LEVEL_TIMER1; 118 clk_total += PCC_TIMER_CYCLES; 119 legacy_timer_tick(1); 120 local_irq_restore(flags); 121 122 return IRQ_HANDLED; 123 } 124 125 126 void mvme147_sched_init (void) 127 { 128 if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER, 129 "timer 1", NULL)) 130 pr_err("Couldn't register timer interrupt\n"); 131 132 /* Init the clock with a value */ 133 /* The clock counter increments until 0xFFFF then reloads */ 134 m147_pcc->t1_preload = PCC_TIMER_PRELOAD; 135 m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN | 136 PCC_TIMER_TIC_EN; 137 m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR | 138 PCC_LEVEL_TIMER1; 139 140 clocksource_register_hz(&mvme147_clk, PCC_TIMER_CLOCK_FREQ); 141 } 142 143 static u64 mvme147_read_clk(struct clocksource *cs) 144 { 145 unsigned long flags; 146 u8 overflow, tmp; 147 u16 count; 148 u32 ticks; 149 150 local_irq_save(flags); 151 tmp = m147_pcc->t1_cntrl >> 4; 152 count = m147_pcc->t1_count; 153 overflow = m147_pcc->t1_cntrl >> 4; 154 if (overflow != tmp) 155 count = m147_pcc->t1_count; 156 count -= PCC_TIMER_PRELOAD; 157 ticks = count + overflow * PCC_TIMER_CYCLES; 158 ticks += clk_total; 159 local_irq_restore(flags); 160 161 return ticks; 162 } 163 164 static int bcd2int (unsigned char b) 165 { 166 return ((b>>4)*10 + (b&15)); 167 } 168 169 int mvme147_hwclk(int op, struct rtc_time *t) 170 { 171 if (!op) { 172 m147_rtc->ctrl = RTC_READ; 173 t->tm_year = bcd2int (m147_rtc->bcd_year); 174 t->tm_mon = bcd2int(m147_rtc->bcd_mth) - 1; 175 t->tm_mday = bcd2int (m147_rtc->bcd_dom); 176 t->tm_hour = bcd2int (m147_rtc->bcd_hr); 177 t->tm_min = bcd2int (m147_rtc->bcd_min); 178 t->tm_sec = bcd2int (m147_rtc->bcd_sec); 179 m147_rtc->ctrl = 0; 180 if (t->tm_year < 70) 181 t->tm_year += 100; 182 } else { 183 /* FIXME Setting the time is not yet supported */ 184 return -EOPNOTSUPP; 185 } 186 return 0; 187 } 188