Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * MOXA ART RTC driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2013 Jonas Jensen
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Jonas Jensen <jonas.jensen@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Based on code from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * Moxa Technology Co., Ltd. <www.moxa.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/rtc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/gpio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/of_gpio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define GPIO_RTC_RESERVED			0x0C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define GPIO_RTC_DATA_SET			0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #define GPIO_RTC_DATA_CLEAR			0x14
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define GPIO_RTC_PIN_PULL_ENABLE		0x18
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #define GPIO_RTC_PIN_PULL_TYPE			0x1C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define GPIO_RTC_INT_ENABLE			0x20
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define GPIO_RTC_INT_RAW_STATE			0x24
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define GPIO_RTC_INT_MASKED_STATE		0x28
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define GPIO_RTC_INT_MASK			0x2C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define GPIO_RTC_INT_CLEAR			0x30
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define GPIO_RTC_INT_TRIGGER			0x34
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #define GPIO_RTC_INT_BOTH			0x38
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #define GPIO_RTC_INT_RISE_NEG			0x3C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #define GPIO_RTC_BOUNCE_ENABLE			0x40
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #define GPIO_RTC_BOUNCE_PRE_SCALE		0x44
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #define GPIO_RTC_PROTECT_W			0x8E
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #define GPIO_RTC_PROTECT_R			0x8F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #define GPIO_RTC_YEAR_W				0x8C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #define GPIO_RTC_YEAR_R				0x8D
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #define GPIO_RTC_DAY_W				0x8A
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) #define GPIO_RTC_DAY_R				0x8B
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #define GPIO_RTC_MONTH_W			0x88
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #define GPIO_RTC_MONTH_R			0x89
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) #define GPIO_RTC_DATE_W				0x86
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) #define GPIO_RTC_DATE_R				0x87
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) #define GPIO_RTC_HOURS_W			0x84
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) #define GPIO_RTC_HOURS_R			0x85
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) #define GPIO_RTC_MINUTES_W			0x82
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) #define GPIO_RTC_MINUTES_R			0x83
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) #define GPIO_RTC_SECONDS_W			0x80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) #define GPIO_RTC_SECONDS_R			0x81
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) #define GPIO_RTC_DELAY_TIME			8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) struct moxart_rtc {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	struct rtc_device *rtc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	spinlock_t rtc_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	int gpio_data, gpio_sclk, gpio_reset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) static int day_of_year[12] =	{ 0, 31, 59, 90, 120, 151, 181,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 				  212, 243, 273, 304, 334 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) static void moxart_rtc_write_byte(struct device *dev, u8 data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	for (i = 0; i < 8; i++, data >>= 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		gpio_set_value(moxart_rtc->gpio_sclk, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		gpio_set_value(moxart_rtc->gpio_data, ((data & 1) == 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		udelay(GPIO_RTC_DELAY_TIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		gpio_set_value(moxart_rtc->gpio_sclk, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		udelay(GPIO_RTC_DELAY_TIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) static u8 moxart_rtc_read_byte(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	u8 data = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	for (i = 0; i < 8; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		gpio_set_value(moxart_rtc->gpio_sclk, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		udelay(GPIO_RTC_DELAY_TIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		gpio_set_value(moxart_rtc->gpio_sclk, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		udelay(GPIO_RTC_DELAY_TIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		if (gpio_get_value(moxart_rtc->gpio_data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 			data |= (1 << i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		udelay(GPIO_RTC_DELAY_TIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	return data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) static u8 moxart_rtc_read_register(struct device *dev, u8 cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	u8 data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	gpio_direction_output(moxart_rtc->gpio_data, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	gpio_set_value(moxart_rtc->gpio_reset, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	udelay(GPIO_RTC_DELAY_TIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	moxart_rtc_write_byte(dev, cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	gpio_direction_input(moxart_rtc->gpio_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	udelay(GPIO_RTC_DELAY_TIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	data = moxart_rtc_read_byte(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	gpio_set_value(moxart_rtc->gpio_sclk, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	gpio_set_value(moxart_rtc->gpio_reset, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	udelay(GPIO_RTC_DELAY_TIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	return data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static void moxart_rtc_write_register(struct device *dev, u8 cmd, u8 data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	gpio_direction_output(moxart_rtc->gpio_data, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	gpio_set_value(moxart_rtc->gpio_reset, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	udelay(GPIO_RTC_DELAY_TIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	moxart_rtc_write_byte(dev, cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	moxart_rtc_write_byte(dev, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	gpio_set_value(moxart_rtc->gpio_sclk, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	gpio_set_value(moxart_rtc->gpio_reset, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	udelay(GPIO_RTC_DELAY_TIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static int moxart_rtc_set_time(struct device *dev, struct rtc_time *tm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	spin_lock_irq(&moxart_rtc->rtc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	moxart_rtc_write_register(dev, GPIO_RTC_PROTECT_W, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	moxart_rtc_write_register(dev, GPIO_RTC_YEAR_W,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 				  (((tm->tm_year - 100) / 10) << 4) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 				  ((tm->tm_year - 100) % 10));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	moxart_rtc_write_register(dev, GPIO_RTC_MONTH_W,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 				  (((tm->tm_mon + 1) / 10) << 4) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 				  ((tm->tm_mon + 1) % 10));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	moxart_rtc_write_register(dev, GPIO_RTC_DATE_W,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 				  ((tm->tm_mday / 10) << 4) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 				  (tm->tm_mday % 10));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	moxart_rtc_write_register(dev, GPIO_RTC_HOURS_W,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 				  ((tm->tm_hour / 10) << 4) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 				  (tm->tm_hour % 10));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	moxart_rtc_write_register(dev, GPIO_RTC_MINUTES_W,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 				  ((tm->tm_min / 10) << 4) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 				  (tm->tm_min % 10));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	moxart_rtc_write_register(dev, GPIO_RTC_SECONDS_W,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 				  ((tm->tm_sec / 10) << 4) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 				  (tm->tm_sec % 10));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	moxart_rtc_write_register(dev, GPIO_RTC_PROTECT_W, 0x80);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	spin_unlock_irq(&moxart_rtc->rtc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	dev_dbg(dev, "%s: success tm_year=%d tm_mon=%d\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		"tm_mday=%d tm_hour=%d tm_min=%d tm_sec=%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		__func__, tm->tm_year, tm->tm_mon, tm->tm_mday,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		tm->tm_hour, tm->tm_min, tm->tm_sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) static int moxart_rtc_read_time(struct device *dev, struct rtc_time *tm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	struct moxart_rtc *moxart_rtc = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	unsigned char v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	spin_lock_irq(&moxart_rtc->rtc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	v = moxart_rtc_read_register(dev, GPIO_RTC_SECONDS_R);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	tm->tm_sec = (((v & 0x70) >> 4) * 10) + (v & 0x0F);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	v = moxart_rtc_read_register(dev, GPIO_RTC_MINUTES_R);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	tm->tm_min = (((v & 0x70) >> 4) * 10) + (v & 0x0F);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	v = moxart_rtc_read_register(dev, GPIO_RTC_HOURS_R);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	if (v & 0x80) { /* 12-hour mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		tm->tm_hour = (((v & 0x10) >> 4) * 10) + (v & 0x0F);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		if (v & 0x20) { /* PM mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 			tm->tm_hour += 12;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 			if (tm->tm_hour >= 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 				tm->tm_hour = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	} else { /* 24-hour mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		tm->tm_hour = (((v & 0x30) >> 4) * 10) + (v & 0x0F);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	v = moxart_rtc_read_register(dev, GPIO_RTC_DATE_R);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	tm->tm_mday = (((v & 0x30) >> 4) * 10) + (v & 0x0F);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	v = moxart_rtc_read_register(dev, GPIO_RTC_MONTH_R);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	tm->tm_mon = (((v & 0x10) >> 4) * 10) + (v & 0x0F);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	tm->tm_mon--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	v = moxart_rtc_read_register(dev, GPIO_RTC_YEAR_R);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	tm->tm_year = (((v & 0xF0) >> 4) * 10) + (v & 0x0F);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	tm->tm_year += 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	if (tm->tm_year <= 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		tm->tm_year += 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	v = moxart_rtc_read_register(dev, GPIO_RTC_DAY_R);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	tm->tm_wday = (v & 0x0f) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	tm->tm_yday = day_of_year[tm->tm_mon];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	tm->tm_yday += (tm->tm_mday - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	if (tm->tm_mon >= 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		if (!(tm->tm_year % 4) && (tm->tm_year % 100))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 			tm->tm_yday++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	tm->tm_isdst = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	spin_unlock_irq(&moxart_rtc->rtc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) static const struct rtc_class_ops moxart_rtc_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	.read_time	= moxart_rtc_read_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	.set_time	= moxart_rtc_set_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) static int moxart_rtc_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	struct moxart_rtc *moxart_rtc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	moxart_rtc = devm_kzalloc(&pdev->dev, sizeof(*moxart_rtc), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	if (!moxart_rtc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	moxart_rtc->gpio_data = of_get_named_gpio(pdev->dev.of_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 						  "gpio-rtc-data", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	if (!gpio_is_valid(moxart_rtc->gpio_data)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		dev_err(&pdev->dev, "invalid gpio (data): %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 			moxart_rtc->gpio_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		return moxart_rtc->gpio_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	moxart_rtc->gpio_sclk = of_get_named_gpio(pdev->dev.of_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 						  "gpio-rtc-sclk", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	if (!gpio_is_valid(moxart_rtc->gpio_sclk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		dev_err(&pdev->dev, "invalid gpio (sclk): %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			moxart_rtc->gpio_sclk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		return moxart_rtc->gpio_sclk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	moxart_rtc->gpio_reset = of_get_named_gpio(pdev->dev.of_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 						   "gpio-rtc-reset", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	if (!gpio_is_valid(moxart_rtc->gpio_reset)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		dev_err(&pdev->dev, "invalid gpio (reset): %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 			moxart_rtc->gpio_reset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		return moxart_rtc->gpio_reset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	spin_lock_init(&moxart_rtc->rtc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	platform_set_drvdata(pdev, moxart_rtc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	ret = devm_gpio_request(&pdev->dev, moxart_rtc->gpio_data, "rtc_data");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		dev_err(&pdev->dev, "can't get rtc_data gpio\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	ret = devm_gpio_request_one(&pdev->dev, moxart_rtc->gpio_sclk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 				    GPIOF_DIR_OUT, "rtc_sclk");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		dev_err(&pdev->dev, "can't get rtc_sclk gpio\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	ret = devm_gpio_request_one(&pdev->dev, moxart_rtc->gpio_reset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 				    GPIOF_DIR_OUT, "rtc_reset");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		dev_err(&pdev->dev, "can't get rtc_reset gpio\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	moxart_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 						   &moxart_rtc_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 						   THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	if (IS_ERR(moxart_rtc->rtc)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		dev_err(&pdev->dev, "devm_rtc_device_register failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		return PTR_ERR(moxart_rtc->rtc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) static const struct of_device_id moxart_rtc_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	{ .compatible = "moxa,moxart-rtc" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	{ },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) MODULE_DEVICE_TABLE(of, moxart_rtc_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) static struct platform_driver moxart_rtc_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	.probe	= moxart_rtc_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	.driver	= {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		.name		= "moxart-rtc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		.of_match_table	= moxart_rtc_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) module_platform_driver(moxart_rtc_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) MODULE_DESCRIPTION("MOXART RTC driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");