===================================================================
@@ -0,0 +1,255 @@
+/*
+ * An SPI driver for the Philips PCF2123 RTC
+ * Copyright 2009 Cyber Switching, Inc.
+ *
+ * Author: Chris Verges <chrisv@cyberswitching.com>
+ * Maintainers: http://www.cyberswitching.com
+ *
+ * based on the RS5C348 driver in this same directory.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/bcd.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/rtc.h>
+#include <linux/workqueue.h>
+#include <linux/spi/spi.h>
+
+#define DRV_VERSION "0.3"
+
+#define PCF2123_REG_CTRL1 0x00 /* Control Register 1 */
+#define PCF2123_REG_CTRL2 0x01 /* Control Register 2 */
+
+#define PCF2123_REG_SC 0x02 /* datetime */
+#define PCF2123_REG_MN 0x03
+#define PCF2123_REG_HR 0x04
+#define PCF2123_REG_DM 0x05
+#define PCF2123_REG_DW 0x06
+#define PCF2123_REG_MO 0x07
+#define PCF2123_REG_YR 0x08
+
+#define PCF2123_CMD_W(addr) (((addr) & 0x0F) | 0x40) /* single
write */
+#define PCF2123_CMD_R(addr) (((addr) & 0x0F) | 0x90) /* single read
*/
+
+static struct spi_driver pcf2123_driver;
+
+struct pcf2123_plat_data {
+ struct rtc_device *rtc;
+};
+
+/*
+ * Causes a 30 nanosecond delay to ensure that the PCF2123 chip select
+ * is released properly after an SPI write. This function should be
+ * called after EVERY read/write call over SPI.
+ */
+static inline void pcf2123_delay_trec(void)
+{
+ ndelay(30);
+}
+
+static int pcf2123_rtc_read_time(struct device *dev, struct rtc_time
*tm)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ u8 txbuf[1], rxbuf[7];
+ int ret;
+
+ txbuf[0] = PCF2123_CMD_R(PCF2123_REG_SC);
+ ret = spi_write_then_read(spi, txbuf, sizeof(txbuf),
+ rxbuf, sizeof(rxbuf));
+ if (ret < 0)
+ return ret;
+ pcf2123_delay_trec();
+
+ tm->tm_sec = bcd2bin(rxbuf[0] & 0x7F);
+ tm->tm_min = bcd2bin(rxbuf[1] & 0x7F);
+ tm->tm_hour = bcd2bin(rxbuf[2] & 0x3F); /* rtc hr 0-23 */
+ tm->tm_mday = bcd2bin(rxbuf[3] & 0x3F);
+ tm->tm_wday = rxbuf[4] & 0x07;
+ tm->tm_mon = bcd2bin(rxbuf[5] & 0x1F) - 1; /* rtc mn 1-12 */
+ tm->tm_year = bcd2bin(rxbuf[6]);
+ if (tm->tm_year < 70)
+ tm->tm_year += 100; /* assume we are in 1970...2069
*/
+
+ dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
+ "mday=%d, mon=%d, year=%d, wday=%d\n",
+ __func__,
+ tm->tm_sec, tm->tm_min, tm->tm_hour,
+ tm->tm_mday, tm->tm_mon, tm->tm_year,
tm->tm_wday);
+
+ /* the clock can give out invalid datetime, but we cannot return
+ * -EINVAL otherwise hwclock will refuse to set the time on
bootup.
+ */
+ if (rtc_valid_tm(tm) < 0)
+ dev_err(dev, "retrieved date/time is not valid.\n");
+
+ return 0;
+}
+
+static int pcf2123_rtc_set_time(struct device *dev, struct rtc_time
*tm)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ u8 txbuf[8];
+ int ret;
+
+ dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
+ "mday=%d, mon=%d, year=%d, wday=%d\n",
+ __func__,
+ tm->tm_sec, tm->tm_min, tm->tm_hour,
+ tm->tm_mday, tm->tm_mon, tm->tm_year,
tm->tm_wday);
+
+ /* Stop the counter first */
+ txbuf[0] = PCF2123_CMD_W(PCF2123_REG_CTRL1);
+ txbuf[1] = 0x20;
+ ret = spi_write(spi, txbuf, 2);
+ if (ret < 0)
+ return ret;
+ pcf2123_delay_trec();
+
+ /* Set the new time */
+ txbuf[0] = PCF2123_CMD_W(PCF2123_REG_SC);
+ txbuf[1] = bin2bcd(tm->tm_sec & 0x7F);
+ txbuf[2] = bin2bcd(tm->tm_min & 0x7F);
+ txbuf[3] = bin2bcd(tm->tm_hour & 0x3F);
+ txbuf[4] = bin2bcd(tm->tm_mday & 0x3F);
+ txbuf[5] = tm->tm_wday & 0x07;
+ txbuf[6] = bin2bcd((tm->tm_mon + 1) & 0x1F); /* rtc mn 1-12 */
+ txbuf[7] = bin2bcd(tm->tm_year < 100 ? tm->tm_year : tm->tm_year
- 100);
+
+ ret = spi_write(spi, txbuf, sizeof(txbuf));
+ if (ret < 0)
+ return ret;
+ pcf2123_delay_trec();
+
+ /* Start the counter */
+ txbuf[0] = PCF2123_CMD_W(PCF2123_REG_CTRL1);
+ txbuf[1] = 0x00;
+ ret = spi_write(spi, txbuf, 2);
+ if (ret < 0)
+ return ret;
+ pcf2123_delay_trec();
+
+ return 0;
+}
+
+static const struct rtc_class_ops pcf2123_rtc_ops = {
+ .read_time = pcf2123_rtc_read_time,
+ .set_time = pcf2123_rtc_set_time,
+};
+
+static int __devinit pcf2123_probe(struct spi_device *spi)
+{
+ struct rtc_device *rtc;
+ struct pcf2123_plat_data *pdata;
+ u8 txbuf[2], rxbuf[1];
+ int ret;
+
+ pdata = kzalloc(sizeof(struct pcf2123_plat_data), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+ spi->dev.platform_data = pdata;
+
+ /* Send a software reset command */
+ txbuf[0] = PCF2123_CMD_W(PCF2123_REG_CTRL1);
+ txbuf[1] = 0x58;
+ ret = spi_write(spi, txbuf, sizeof(txbuf));
+ if (ret < 0)
+ return ret;
+ pcf2123_delay_trec();
+
+ /* Stop the counter */
+ txbuf[0] = PCF2123_CMD_W(PCF2123_REG_CTRL1);
+ txbuf[1] = 0x20;
+ ret = spi_write(spi, txbuf, sizeof(txbuf));
+ if (ret < 0)
+ return ret;
+ pcf2123_delay_trec();
+
+ /* See if the counter was actually stopped */
+ txbuf[0] = PCF2123_CMD_R(PCF2123_REG_CTRL1);
+ ret = spi_write_then_read(spi, txbuf, 1, rxbuf, sizeof(rxbuf));
+ if (ret < 0)
+ goto kfree_exit;
+ pcf2123_delay_trec();
+
+ if (!(rxbuf[0] & 0x20)) {
+ dev_err(&spi->dev, "not found.\n");
+ goto kfree_exit;
+ }
+
+ dev_info(&spi->dev, "chip found, driver version " DRV_VERSION
"\n");
+ dev_info(&spi->dev, "spiclk %u KHz.\n",
+ (spi->max_speed_hz + 500) / 1000);
+
+ /* Start the counter */
+ txbuf[0] = PCF2123_CMD_W(PCF2123_REG_CTRL1);
+ txbuf[1] = 0x00;
+ ret = spi_write(spi, txbuf, sizeof(txbuf));
+ if (ret < 0)
+ goto kfree_exit;
+ pcf2123_delay_trec();
+
+ /* Finalize the initialization */
+ rtc = rtc_device_register(pcf2123_driver.driver.name, &spi->dev,
+ &pcf2123_rtc_ops, THIS_MODULE);
+
+ if (IS_ERR(rtc)) {
+ ret = PTR_ERR(rtc);
+ goto kfree_exit;
+ }
+
+ pdata->rtc = rtc;
+
+ return 0;
+kfree_exit:
+ kfree(pdata);
+ return ret;
+}
+
+static int pcf2123_remove(struct spi_device *spi)
+{
+ struct pcf2123_plat_data *pdata = spi->dev.platform_data;
+ struct rtc_device *rtc = pdata->rtc;
+
+ if (rtc)
+ rtc_device_unregister(rtc);
+
+ kfree(pdata);
+
+ return 0;
+}
+
+static struct spi_driver pcf2123_driver = {
+ .driver = {
+ .name = "rtc-pcf2123",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = pcf2123_probe,
+ .remove = __devexit_p(pcf2123_remove),
+};
+
+static int __init pcf2123_init(void)
+{
+ return spi_register_driver(&pcf2123_driver);
+}
+
+static void __exit pcf2123_exit(void)
+{
+ spi_unregister_driver(&pcf2123_driver);
+}
+
+MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>");
+MODULE_DESCRIPTION("NXP PCF2123 RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+module_init(pcf2123_init);
+module_exit(pcf2123_exit);
===================================================================
@@ -53,6 +53,7 @@
obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o
obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o
obj-$(CONFIG_RTC_DRV_PCF8583) += rtc-pcf8583.o
+obj-$(CONFIG_RTC_DRV_PCF2123) += rtc-pcf2123.o
obj-$(CONFIG_RTC_DRV_PL030) += rtc-pl030.o
obj-$(CONFIG_RTC_DRV_PL031) += rtc-pl031.o
obj-$(CONFIG_RTC_DRV_PARISC) += rtc-parisc.o
===================================================================
@@ -368,6 +368,15 @@
This driver can also be built as a module. If so, the module
will be called rtc-ds3234.
+config RTC_DRV_PCF2123
+ tristate "NXP PCF2123"
+ help
+ If you say yes here you get support for the NXP PCF2123
+ RTC chip.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-pcf2123.
+
endif # SPI_MASTER
comment "Platform RTC drivers"