----
rtc: tps6586x: add RTC driver for TI TPS6586x
Signed-off-by: Gary King <gking@xxxxxxxxxx>
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 48ca713..241c7f7 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -286,6 +286,13 @@ config RTC_DRV_DM355EVM
help
Supports the RTC firmware in the MSP430 on the DM355 EVM.
+config RTC_DRV_TPS6586X
+ tristate "TI TPS6586X RTC"
+ depends on I2C
+ select MFD_TPS6586X
+ help
+ This driver supports TPS6586X RTC
+
config RTC_DRV_TWL92330
boolean "TI TWL92330/Menelaus"
depends on MENELAUS
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 0f207b3..acd8426 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -91,6 +91,7 @@ obj-$(CONFIG_RTC_DRV_STK17TA8) += rtc-stk17ta8.o
obj-$(CONFIG_RTC_DRV_STMP) += rtc-stmp3xxx.o
obj-$(CONFIG_RTC_DRV_SUN4V) += rtc-sun4v.o
obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o
+obj-$(CONFIG_RTC_DRV_TPS6586X) += rtc-tps6586x.o
obj-$(CONFIG_RTC_DRV_TWL4030) += rtc-twl.o
obj-$(CONFIG_RTC_DRV_TX4939) += rtc-tx4939.o
obj-$(CONFIG_RTC_DRV_V3020) += rtc-v3020.o
diff --git a/drivers/rtc/rtc-tps6586x.c b/drivers/rtc/rtc-tps6586x.c
new file mode 100644
index 0000000..f898f40
--- /dev/null
+++ b/drivers/rtc/rtc-tps6586x.c
@@ -0,0 +1,203 @@
+/*
+ * drivers/rtc/rtc-tps6586x.c
+ *
+ * RTC driver for TI TPS6586x
+ *
+ * Copyright (c) 2010, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mfd/tps6586x.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/slab.h>
+
+#define TPS_EPOCH 2009
+
+#define RTC_CTRL 0xc0
+#define RTC_ENABLE (1 << 5) /* enables tick updates */
+#define RTC_HIRES (1 << 4) /* 1Khz or 32Khz updates */
+#define RTC_ALARM1_HI 0xc1
+#define RTC_COUNT4 0xc6
+
+struct tps6586x_rtc {
+ unsigned long epoch_start;
+ struct rtc_device *rtc;
+};
+
+static inline struct device *to_tps6586x_dev(struct device *dev)
+{
+ return dev->parent;
+}
+
+static int tps6586x_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
+ struct device *tps_dev = to_tps6586x_dev(dev);
+ unsigned long long ticks = 0;
+ unsigned long seconds;
+ u8 buff[5];
+ int err;
+ int i;
+
+ err = tps6586x_reads(tps_dev, RTC_COUNT4, sizeof(buff), buff);
+ if (err < 0) {
+ dev_err(dev, "failed to read counter\n");
+ return err;
+ }
+
+ for (i = 0; i < sizeof(buff); i++) {
+ ticks <<= 8;
+ ticks |= buff[i];
+ }
+
+ seconds = ticks >> 10;
+
+ seconds += rtc->epoch_start;
+ rtc_time_to_tm(seconds, tm);
+ return rtc_valid_tm(tm);
+}
+
+static int tps6586x_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
+ struct device *tps_dev = to_tps6586x_dev(dev);
+ unsigned long long ticks;
+ unsigned long seconds;
+ u8 buff[5];
+ int err;
+
+ rtc_tm_to_time(tm, &seconds);
+
+ if (WARN_ON(seconds < rtc->epoch_start)) {
+ dev_err(dev, "requested time unsupported\n");
+ return -EINVAL;
+ }
+
+ seconds -= rtc->epoch_start;
+
+ ticks = seconds << 10;
+ buff[0] = (ticks >> 32) & 0xff;
+ buff[1] = (ticks >> 24) & 0xff;
+ buff[2] = (ticks >> 16) & 0xff;
+ buff[3] = (ticks >> 8) & 0xff;
+ buff[4] = ticks & 0xff;
+
+ dev_info(dev, "setting time to %lu seconds (%llu ticks)\n",
+ seconds, ticks);
+
+
+ err = tps6586x_clr_bits(tps_dev, RTC_CTRL, RTC_ENABLE);
+ if (err < 0) {
+ dev_err(dev, "failed to clear RTC_ENABLE\n");
+ return err;
+ }
+
+ err = tps6586x_writes(tps_dev, RTC_COUNT4, sizeof(buff), buff);
+ if (err < 0) {
+ dev_err(dev, "failed to program new time\n");
+ return err;
+ }
+
+ err = tps6586x_set_bits(tps_dev, RTC_CTRL, RTC_ENABLE);
+ if (err < 0) {
+ dev_err(dev, "failed to set RTC_ENABLE\n");
+ return err;
+ }
+
+ return 0;
+}
+
+static const struct rtc_class_ops tps6586x_rtc_ops = {
+ .read_time = tps6586x_rtc_read_time,
+ .set_time = tps6586x_rtc_set_time,
+};
+
+static int __devinit tps6586x_rtc_probe(struct platform_device *pdev)
+{
+ struct device *tps_dev = to_tps6586x_dev(&pdev->dev);
+ struct tps6586x_rtc *rtc;
+ int err;
+
+ rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
+
+ if (!rtc)
+ return -ENOMEM;
+
+ rtc->epoch_start = mktime(TPS_EPOCH, 1, 1, 0, 0, 0);
+ rtc->rtc = rtc_device_register("tps6586x-rtc", &pdev->dev,
+ &tps6586x_rtc_ops, THIS_MODULE);
+
+ if (IS_ERR(rtc->rtc)) {
+ err = PTR_ERR(rtc->rtc);
+ goto fail;
+ }
+
+ /* disable high-res mode, enable tick counting */
+ err = tps6586x_update(tps_dev, RTC_CTRL,
+ (RTC_ENABLE | RTC_HIRES), RTC_ENABLE);
+ if (err < 0) {
+ dev_err(&pdev->dev, "unable to start counter\n");
+ goto fail;
+ }
+
+ dev_set_drvdata(&pdev->dev, rtc);
+ return 0;
+
+fail:
+ if (!IS_ERR_OR_NULL(rtc->rtc))
+ rtc_device_unregister(rtc->rtc);
+ kfree(rtc);
+ return err;
+}
+
+static int __devexit tps6586x_rtc_remove(struct platform_device *pdev)
+{
+ struct tps6586x_rtc *rtc = dev_get_drvdata(&pdev->dev);
+
+ rtc_device_unregister(rtc->rtc);
+ kfree(rtc);
+ return 0;
+}
+
+static struct platform_driver tps6586x_rtc_driver = {
+ .driver = {
+ .name = "tps6586x-rtc",
+ .owner = THIS_MODULE,
+ },
+ .probe = tps6586x_rtc_probe,
+ .remove = __devexit_p(tps6586x_rtc_remove),
+};
+
+static int __init tps6586x_rtc_init(void)
+{
+ return platform_driver_register(&tps6586x_rtc_driver);
+}
+module_init(tps6586x_rtc_init);
+
+static void __exit tps6586x_rtc_exit(void)
+{
+ platform_driver_unregister(&tps6586x_rtc_driver);
+}
+module_exit(tps6586x_rtc_exit);
+
+MODULE_DESCRIPTION("TI TPS6586x RTC driver");
+MODULE_AUTHOR("NVIDIA Corporation");
+MODULE_LICENSE("GPL");
nvpublic
--
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