Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * IBM OPAL RTC driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2014 IBM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #define DRVNAME		"rtc-opal"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/rtc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/bcd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <asm/opal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/firmware.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) static void opal_to_tm(u32 y_m_d, u64 h_m_s_ms, struct rtc_time *tm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	tm->tm_year = ((bcd2bin(y_m_d >> 24) * 100) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 		       bcd2bin((y_m_d >> 16) & 0xff)) - 1900;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	tm->tm_mon  = bcd2bin((y_m_d >> 8) & 0xff) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	tm->tm_mday = bcd2bin(y_m_d & 0xff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	tm->tm_hour = bcd2bin((h_m_s_ms >> 56) & 0xff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	tm->tm_min  = bcd2bin((h_m_s_ms >> 48) & 0xff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	tm->tm_sec  = bcd2bin((h_m_s_ms >> 40) & 0xff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	tm->tm_wday = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static void tm_to_opal(struct rtc_time *tm, u32 *y_m_d, u64 *h_m_s_ms)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	*y_m_d |= ((u32)bin2bcd((tm->tm_year + 1900) / 100)) << 24;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	*y_m_d |= ((u32)bin2bcd((tm->tm_year + 1900) % 100)) << 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	*y_m_d |= ((u32)bin2bcd((tm->tm_mon + 1))) << 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	*y_m_d |= ((u32)bin2bcd(tm->tm_mday));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	*h_m_s_ms |= ((u64)bin2bcd(tm->tm_hour)) << 56;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	*h_m_s_ms |= ((u64)bin2bcd(tm->tm_min)) << 48;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	*h_m_s_ms |= ((u64)bin2bcd(tm->tm_sec)) << 40;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) static int opal_get_rtc_time(struct device *dev, struct rtc_time *tm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	s64 rc = OPAL_BUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	int retries = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	u32 y_m_d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	u64 h_m_s_ms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	__be32 __y_m_d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	__be64 __h_m_s_ms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		rc = opal_rtc_read(&__y_m_d, &__h_m_s_ms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		if (rc == OPAL_BUSY_EVENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 			msleep(OPAL_BUSY_DELAY_MS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 			opal_poll_events(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		} else if (rc == OPAL_BUSY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 			msleep(OPAL_BUSY_DELAY_MS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		} else if (rc == OPAL_HARDWARE || rc == OPAL_INTERNAL_ERROR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 			if (retries--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 				msleep(10); /* Wait 10ms before retry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 				rc = OPAL_BUSY; /* go around again */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if (rc != OPAL_SUCCESS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	y_m_d = be32_to_cpu(__y_m_d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	h_m_s_ms = be64_to_cpu(__h_m_s_ms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	opal_to_tm(y_m_d, h_m_s_ms, tm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) static int opal_set_rtc_time(struct device *dev, struct rtc_time *tm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	s64 rc = OPAL_BUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	int retries = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	u32 y_m_d = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	u64 h_m_s_ms = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	tm_to_opal(tm, &y_m_d, &h_m_s_ms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		rc = opal_rtc_write(y_m_d, h_m_s_ms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		if (rc == OPAL_BUSY_EVENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 			msleep(OPAL_BUSY_DELAY_MS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 			opal_poll_events(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		} else if (rc == OPAL_BUSY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 			msleep(OPAL_BUSY_DELAY_MS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		} else if (rc == OPAL_HARDWARE || rc == OPAL_INTERNAL_ERROR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 			if (retries--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 				msleep(10); /* Wait 10ms before retry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 				rc = OPAL_BUSY; /* go around again */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	return rc == OPAL_SUCCESS ? 0 : -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)  * TPO	Timed Power-On
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)  * TPO get/set OPAL calls care about the hour and min and to make it consistent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)  * with the rtc utility time conversion functions, we use the 'u64' to store
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)  * its value and perform bit shift by 32 before use..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static int opal_get_tpo_time(struct device *dev, struct rtc_wkalrm *alarm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	__be32 __y_m_d, __h_m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	struct opal_msg msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	int rc, token;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	u64 h_m_s_ms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	u32 y_m_d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	token = opal_async_get_token_interruptible();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	if (token < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		if (token != -ERESTARTSYS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 			pr_err("Failed to get the async token\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		return token;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	rc = opal_tpo_read(token, &__y_m_d, &__h_m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	if (rc != OPAL_ASYNC_COMPLETION) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	rc = opal_async_wait_response(token, &msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	rc = opal_get_async_rc(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	if (rc != OPAL_SUCCESS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	y_m_d = be32_to_cpu(__y_m_d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	h_m_s_ms = ((u64)be32_to_cpu(__h_m) << 32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	/* check if no alarm is set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (y_m_d == 0 && h_m_s_ms == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		pr_debug("No alarm is set\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		rc = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		pr_debug("Alarm set to %x %llx\n", y_m_d, h_m_s_ms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	opal_to_tm(y_m_d, h_m_s_ms, &alarm->time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	opal_async_release_token(token);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) /* Set Timed Power-On */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static int opal_set_tpo_time(struct device *dev, struct rtc_wkalrm *alarm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	u64 h_m_s_ms = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	struct opal_msg msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	u32 y_m_d = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	int token, rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	/* if alarm is enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	if (alarm->enabled) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		tm_to_opal(&alarm->time, &y_m_d, &h_m_s_ms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		pr_debug("Alarm set to %x %llx\n", y_m_d, h_m_s_ms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		pr_debug("Alarm getting disabled\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	token = opal_async_get_token_interruptible();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if (token < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		if (token != -ERESTARTSYS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			pr_err("Failed to get the async token\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		return token;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	/* TPO, we care about hour and minute */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	rc = opal_tpo_write(token, y_m_d,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 			    (u32)((h_m_s_ms >> 32) & 0xffff0000));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	if (rc != OPAL_ASYNC_COMPLETION) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	rc = opal_async_wait_response(token, &msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	rc = opal_get_async_rc(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	if (rc != OPAL_SUCCESS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	opal_async_release_token(token);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static int opal_tpo_alarm_irq_enable(struct device *dev, unsigned int enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	struct rtc_wkalrm alarm = { .enabled = 0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	 * TPO is automatically enabled when opal_set_tpo_time() is called with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	 * non-zero rtc-time. We only handle disable case which needs to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	 * explicitly told to opal.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	return enabled ? 0 : opal_set_tpo_time(dev, &alarm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) static struct rtc_class_ops opal_rtc_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	.read_time	= opal_get_rtc_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	.set_time	= opal_set_rtc_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static int opal_rtc_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	struct rtc_device *rtc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	if (pdev->dev.of_node &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	    (of_property_read_bool(pdev->dev.of_node, "wakeup-source") ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	     of_property_read_bool(pdev->dev.of_node, "has-tpo")/* legacy */)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		device_set_wakeup_capable(&pdev->dev, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		opal_rtc_ops.read_alarm	= opal_get_tpo_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		opal_rtc_ops.set_alarm = opal_set_tpo_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		opal_rtc_ops.alarm_irq_enable = opal_tpo_alarm_irq_enable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	rtc = devm_rtc_device_register(&pdev->dev, DRVNAME, &opal_rtc_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 				       THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	if (IS_ERR(rtc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		return PTR_ERR(rtc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	rtc->uie_unsupported = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static const struct of_device_id opal_rtc_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		.compatible	= "ibm,opal-rtc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) MODULE_DEVICE_TABLE(of, opal_rtc_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) static const struct platform_device_id opal_rtc_driver_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		.name		= "opal-rtc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) MODULE_DEVICE_TABLE(platform, opal_rtc_driver_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) static struct platform_driver opal_rtc_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	.probe		= opal_rtc_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	.id_table	= opal_rtc_driver_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	.driver		= {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		.name		= DRVNAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		.of_match_table	= opal_rtc_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) static int __init opal_rtc_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	if (!firmware_has_feature(FW_FEATURE_OPAL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	return platform_driver_register(&opal_rtc_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) static void __exit opal_rtc_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	platform_driver_unregister(&opal_rtc_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) MODULE_DESCRIPTION("IBM OPAL RTC driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) module_init(opal_rtc_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) module_exit(opal_rtc_exit);