1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Faraday FTRTC010 Real Time Clock 4 * 5 * (C) Copyright 2009 Faraday Technology 6 * Po-Yu Chuang <ratbert@faraday-tech.com> 7 */ 8 9 #include <config.h> 10 #include <common.h> 11 #include <rtc.h> 12 #include <asm/io.h> 13 14 struct ftrtc010 { 15 unsigned int sec; /* 0x00 */ 16 unsigned int min; /* 0x04 */ 17 unsigned int hour; /* 0x08 */ 18 unsigned int day; /* 0x0c */ 19 unsigned int alarm_sec; /* 0x10 */ 20 unsigned int alarm_min; /* 0x14 */ 21 unsigned int alarm_hour; /* 0x18 */ 22 unsigned int record; /* 0x1c */ 23 unsigned int cr; /* 0x20 */ 24 unsigned int wsec; /* 0x24 */ 25 unsigned int wmin; /* 0x28 */ 26 unsigned int whour; /* 0x2c */ 27 unsigned int wday; /* 0x30 */ 28 unsigned int intr; /* 0x34 */ 29 unsigned int div; /* 0x38 */ 30 unsigned int rev; /* 0x3c */ 31 }; 32 33 /* 34 * RTC Control Register 35 */ 36 #define FTRTC010_CR_ENABLE (1 << 0) 37 #define FTRTC010_CR_INTERRUPT_SEC (1 << 1) /* per second irq */ 38 #define FTRTC010_CR_INTERRUPT_MIN (1 << 2) /* per minute irq */ 39 #define FTRTC010_CR_INTERRUPT_HR (1 << 3) /* per hour irq */ 40 #define FTRTC010_CR_INTERRUPT_DAY (1 << 4) /* per day irq */ 41 42 static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE; 43 44 static void ftrtc010_enable(void) 45 { 46 writel(FTRTC010_CR_ENABLE, &rtc->cr); 47 } 48 49 /* 50 * return current time in seconds 51 */ 52 static unsigned long ftrtc010_time(void) 53 { 54 unsigned long day; 55 unsigned long hour; 56 unsigned long minute; 57 unsigned long second; 58 unsigned long second2; 59 60 do { 61 second = readl(&rtc->sec); 62 day = readl(&rtc->day); 63 hour = readl(&rtc->hour); 64 minute = readl(&rtc->min); 65 second2 = readl(&rtc->sec); 66 } while (second != second2); 67 68 return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second; 69 } 70 71 /* 72 * Get the current time from the RTC 73 */ 74 75 int rtc_get(struct rtc_time *tmp) 76 { 77 unsigned long now; 78 79 debug("%s(): record register: %x\n", 80 __func__, readl(&rtc->record)); 81 82 #ifdef CONFIG_FTRTC010_PCLK 83 now = (ftrtc010_time() + readl(&rtc->record)) / RTC_DIV_COUNT; 84 #else /* CONFIG_FTRTC010_EXTCLK */ 85 now = ftrtc010_time() + readl(&rtc->record); 86 #endif 87 88 rtc_to_tm(now, tmp); 89 90 return 0; 91 } 92 93 /* 94 * Set the RTC 95 */ 96 int rtc_set(struct rtc_time *tmp) 97 { 98 unsigned long new; 99 unsigned long now; 100 101 debug("%s(): DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 102 __func__, 103 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 104 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 105 106 new = rtc_mktime(tmp); 107 108 now = ftrtc010_time(); 109 110 debug("%s(): write %lx to record register\n", __func__, new - now); 111 112 writel(new - now, &rtc->record); 113 114 return 0; 115 } 116 117 void rtc_reset(void) 118 { 119 debug("%s()\n", __func__); 120 ftrtc010_enable(); 121 } 122