rtc: Add RTC chip pcf2127 support

This driver compatible with pcf2127 and pcf2129 Signed-off-by: Meng Yi <meng.yi@nxp.com> Reviewed-by: Simon Glass <sjg@chromium.org>

rtc: Add RTC chip pcf2127 support
This driver compatible with pcf2127 and pcf2129 Signed-off-by: Meng Yi <meng.yi@nxp.com> Reviewed-by: Simon Glass <sjg@chromium.org>
Meng Yi · Simon Glass
1 parent 13f3fcac53
Showing 3 changed files with 114 additions and 0 deletions Side-by-side Diff
drivers/rtc/Kconfig
drivers/rtc/Makefile
drivers/rtc/pcf2127.c
@@ -13,5 +13,11 @@
 	  drivers to perform the actual functions. See rtc.h for a
 	  description of the API.
  
+config RTC_PCF2127
+	bool "Enable PCF2127 driver"
+	depends on DM_RTC
+	help
+	  Enable pcf2127 driver which provides rtc get and set function
+
 endmenu
@@ -45,6 +45,7 @@
 obj-$(CONFIG_RTC_MX27) += mx27rtc.o
 obj-$(CONFIG_RTC_MXS) += mxsrtc.o
 obj-$(CONFIG_RTC_PCF8563) += pcf8563.o
+obj-$(CONFIG_RTC_PCF2127) += pcf2127.o
 obj-$(CONFIG_RTC_PL031) += pl031.o
 obj-$(CONFIG_RTC_PT7C4338) += pt7c4338.o
 obj-$(CONFIG_RTC_RS5C372A) += rs5c372.o
+/*
+ * Copyright (C) 2016 by NXP Semiconductors Inc.
+ * Date & Time support for PCF2127 RTC
+ */
+
+/*	#define	DEBUG	*/
+
+#include <common.h>
+#include <command.h>
+#include <dm.h>
+#include <i2c.h>
+#include <rtc.h>
+
+#define PCF2127_REG_CTRL1	(0x00)
+#define PCF2127_REG_CTRL2	(0x01)
+#define PCF2127_REG_CTRL3	(0x02)
+#define PCF2127_REG_SC		(0x03)  /* datetime */
+#define PCF2127_REG_MN		(0x04)
+#define PCF2127_REG_HR		(0x05)
+#define PCF2127_REG_DM		(0x06)
+#define PCF2127_REG_DW		(0x07)
+#define PCF2127_REG_MO		(0x08)
+#define PCF2127_REG_YR		(0x09)
+
+static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm)
+{
+	uchar buf[8];
+	int i = 0;
+
+	/* start register address */
+	buf[i++] = PCF2127_REG_SC;
+
+	/* hours, minutes and seconds */
+	buf[i++] = bin2bcd(tm->tm_sec);
+	buf[i++] = bin2bcd(tm->tm_min);
+	buf[i++] = bin2bcd(tm->tm_hour);
+	buf[i++] = bin2bcd(tm->tm_mday);
+	buf[i++] = tm->tm_wday & 0x07;
+
+	/* month, 1 - 12 */
+	buf[i++] = bin2bcd(tm->tm_mon + 1);
+
+	/* year */
+	buf[i++] = bin2bcd(tm->tm_year % 100);
+
+	/* write register's data */
+	if (dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)) < 0)
+		return -1;
+
+	return 0;
+}
+
+static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm)
+{
+	int rel = 0;
+	uchar buf[10] = { PCF2127_REG_CTRL1 };
+
+	if (dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, 1) < 0)
+		return -1;
+	if (dm_i2c_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)) < 0)
+		return -1;
+
+	if (buf[PCF2127_REG_CTRL3] & 0x04)
+		puts("### Warning: RTC Low Voltage - date/time not reliable\n");
+
+	tm->tm_sec  = bcd2bin(buf[PCF2127_REG_SC] & 0x7F);
+	tm->tm_min  = bcd2bin(buf[PCF2127_REG_MN] & 0x7F);
+	tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F);
+	tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F);
+	tm->tm_mon  = bcd2bin(buf[PCF2127_REG_MO] & 0x1F) - 1;
+	tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900;
+	if (tm->tm_year < 1970)
+		tm->tm_year += 100;	/* assume we are in 1970...2069 */
+	tm->tm_wday = buf[PCF2127_REG_DW] & 0x07;
+	tm->tm_yday = 0;
+	tm->tm_isdst = 0;
+
+	debug("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
+	      tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
+	      tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+	return rel;
+}
+
+static int pcf2127_rtc_reset(struct udevice *dev)
+{
+	/*Doing nothing here*/
+	return 0;
+}
+
+static const struct rtc_ops pcf2127_rtc_ops = {
+	.get = pcf2127_rtc_get,
+	.set = pcf2127_rtc_set,
+	.reset = pcf2127_rtc_reset,
+};
+
+static const struct udevice_id pcf2127_rtc_ids[] = {
+	{ .compatible = "pcf2127-rtc" },
+	{ }
+};
+
+U_BOOT_DRIVER(rtc_pcf2127) = {
+	.name	= "rtc-pcf2127",
+	.id	= UCLASS_RTC,
+	.of_match = pcf2127_rtc_ids,
+	.ops	= &pcf2127_rtc_ops,
+};
...	...	@@ -13,5 +13,11 @@
13	13	drivers to perform the actual functions. See rtc.h for a
14	14	description of the API.
15	15
	16	+config RTC_PCF2127
	17	+ bool "Enable PCF2127 driver"
	18	+ depends on DM_RTC
	19	+ help
	20	+ Enable pcf2127 driver which provides rtc get and set function
	21	+
16	22	endmenu
...	...	@@ -45,6 +45,7 @@
45	45	obj-$(CONFIG_RTC_MX27) += mx27rtc.o
46	46	obj-$(CONFIG_RTC_MXS) += mxsrtc.o
47	47	obj-$(CONFIG_RTC_PCF8563) += pcf8563.o
	48	+obj-$(CONFIG_RTC_PCF2127) += pcf2127.o
48	49	obj-$(CONFIG_RTC_PL031) += pl031.o
49	50	obj-$(CONFIG_RTC_PT7C4338) += pt7c4338.o
50	51	obj-$(CONFIG_RTC_RS5C372A) += rs5c372.o
	1	+/*
	2	+ * Copyright (C) 2016 by NXP Semiconductors Inc.
	3	+ * Date & Time support for PCF2127 RTC
	4	+ */
	5	+
	6	+/* #define DEBUG */
	7	+
	8	+#include <common.h>
	9	+#include <command.h>
	10	+#include <dm.h>
	11	+#include <i2c.h>
	12	+#include <rtc.h>
	13	+
	14	+#define PCF2127_REG_CTRL1 (0x00)
	15	+#define PCF2127_REG_CTRL2 (0x01)
	16	+#define PCF2127_REG_CTRL3 (0x02)
	17	+#define PCF2127_REG_SC (0x03) /* datetime */
	18	+#define PCF2127_REG_MN (0x04)
	19	+#define PCF2127_REG_HR (0x05)
	20	+#define PCF2127_REG_DM (0x06)
	21	+#define PCF2127_REG_DW (0x07)
	22	+#define PCF2127_REG_MO (0x08)
	23	+#define PCF2127_REG_YR (0x09)
	24	+
	25	+static int pcf2127_rtc_set(struct udevice dev, const struct rtc_time tm)
	26	+{
	27	+ uchar buf[8];
	28	+ int i = 0;
	29	+
	30	+ /* start register address */
	31	+ buf[i++] = PCF2127_REG_SC;
	32	+
	33	+ /* hours, minutes and seconds */
	34	+ buf[i++] = bin2bcd(tm->tm_sec);
	35	+ buf[i++] = bin2bcd(tm->tm_min);
	36	+ buf[i++] = bin2bcd(tm->tm_hour);
	37	+ buf[i++] = bin2bcd(tm->tm_mday);
	38	+ buf[i++] = tm->tm_wday & 0x07;
	39	+
	40	+ /* month, 1 - 12 */
	41	+ buf[i++] = bin2bcd(tm->tm_mon + 1);
	42	+
	43	+ /* year */
	44	+ buf[i++] = bin2bcd(tm->tm_year % 100);
	45	+
	46	+ /* write register's data */
	47	+ if (dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)) < 0)
	48	+ return -1;
	49	+
	50	+ return 0;
	51	+}
	52	+
	53	+static int pcf2127_rtc_get(struct udevice dev, struct rtc_time tm)
	54	+{
	55	+ int rel = 0;
	56	+ uchar buf[10] = { PCF2127_REG_CTRL1 };
	57	+
	58	+ if (dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, 1) < 0)
	59	+ return -1;
	60	+ if (dm_i2c_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)) < 0)
	61	+ return -1;
	62	+
	63	+ if (buf[PCF2127_REG_CTRL3] & 0x04)
	64	+ puts("### Warning: RTC Low Voltage - date/time not reliable\n");
	65	+
	66	+ tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F);
	67	+ tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F);
	68	+ tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F);
	69	+ tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F);
	70	+ tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F) - 1;
	71	+ tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900;
	72	+ if (tm->tm_year < 1970)
	73	+ tm->tm_year += 100; /* assume we are in 1970...2069 */
	74	+ tm->tm_wday = buf[PCF2127_REG_DW] & 0x07;
	75	+ tm->tm_yday = 0;
	76	+ tm->tm_isdst = 0;
	77	+
	78	+ debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	79	+ tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
	80	+ tm->tm_hour, tm->tm_min, tm->tm_sec);
	81	+
	82	+ return rel;
	83	+}
	84	+
	85	+static int pcf2127_rtc_reset(struct udevice *dev)
	86	+{
	87	+ /Doing nothing here/
	88	+ return 0;
	89	+}
	90	+
	91	+static const struct rtc_ops pcf2127_rtc_ops = {
	92	+ .get = pcf2127_rtc_get,
	93	+ .set = pcf2127_rtc_set,
	94	+ .reset = pcf2127_rtc_reset,
	95	+};
	96	+
	97	+static const struct udevice_id pcf2127_rtc_ids[] = {
	98	+ { .compatible = "pcf2127-rtc" },
	99	+ { }
	100	+};
	101	+
	102	+U_BOOT_DRIVER(rtc_pcf2127) = {
	103	+ .name = "rtc-pcf2127",
	104	+ .id = UCLASS_RTC,
	105	+ .of_match = pcf2127_rtc_ids,
	106	+ .ops = &pcf2127_rtc_ops,
	107	+};