[PATCH] RTC subsystem: EP93XX driver

This patch adds a driver for the RTC embedded in the Cirrus Logic EP93XX
family of processors.

Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 609f555934596f8e4f0fe2abd10659a5d8e6f017..b399259784e2c3b611b67bab8fbd9964df8ed7a6 100644 (file)
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -117,6 +117,17 @@ config RTC_DRV_RS5C372
          This driver can also be built as a module. If so, the module
          will be called rtc-rs5c372.
 
+config RTC_DRV_EP93XX
+       tristate "Cirrus Logic EP93XX"
+       depends on RTC_CLASS && ARCH_EP93XX
+       help
+         If you say yes here you get support for the
+         RTC embedded in the Cirrus Logic EP93XX processors.
+
+         This driver can also be built as a module. If so, the module
+         will be called rtc-ep93xx.
+
+
 config RTC_DRV_TEST
        tristate "Test driver/device"
        depends on RTC_CLASS

diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index d2b4b17355984b7a975c8ca6dd3d3ed6c57b72a6..38b4d87939e1dde1387e823be9c0b9deecec75aa 100644 (file)
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -16,4 +16,4 @@ obj-$(CONFIG_RTC_DRV_TEST)    += rtc-test.o
 obj-$(CONFIG_RTC_DRV_DS1672)   += rtc-ds1672.o
 obj-$(CONFIG_RTC_DRV_PCF8563)  += rtc-pcf8563.o
 obj-$(CONFIG_RTC_DRV_RS5C372)  += rtc-rs5c372.o
-
+obj-$(CONFIG_RTC_DRV_EP93XX)   += rtc-ep93xx.o

diff --git a/drivers/rtc/rtc-ep93xx.c b/drivers/rtc/rtc-ep93xx.c
new file mode 100644 (file)
index 0000000..0dd80ea
--- /dev/null
+++ b/drivers/rtc/rtc-ep93xx.c
@@ -0,0 +1,162 @@
+/*
+ * A driver for the RTC embedded in the Cirrus Logic EP93XX processors
+ * Copyright (c) 2006 Tower Technologies
+ *
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
+ *
+ * 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/module.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+#include <asm/hardware.h>
+
+#define EP93XX_RTC_REG(x)      (EP93XX_RTC_BASE + (x))
+#define EP93XX_RTC_DATA                EP93XX_RTC_REG(0x0000)
+#define EP93XX_RTC_LOAD                EP93XX_RTC_REG(0x000C)
+#define EP93XX_RTC_SWCOMP      EP93XX_RTC_REG(0x0108)
+
+#define DRV_VERSION "0.2"
+
+static int ep93xx_get_swcomp(struct device *dev, unsigned short *preload,
+                               unsigned short *delete)
+{
+       unsigned short comp = __raw_readl(EP93XX_RTC_SWCOMP);
+
+       if (preload)
+               *preload = comp & 0xffff;
+
+       if (delete)
+               *delete = (comp >> 16) & 0x1f;
+
+       return 0;
+}
+
+static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+       unsigned long time = __raw_readl(EP93XX_RTC_DATA);
+
+       rtc_time_to_tm(time, tm);
+       return 0;
+}
+
+static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
+{
+       __raw_writel(secs + 1, EP93XX_RTC_LOAD);
+       return 0;
+}
+
+static int ep93xx_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+       int err;
+       unsigned long secs;
+
+       err = rtc_tm_to_time(tm, &secs);
+       if (err != 0)
+               return err;
+
+       return ep93xx_rtc_set_mmss(dev, secs);
+}
+
+static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq)
+{
+       unsigned short preload, delete;
+
+       ep93xx_get_swcomp(dev, &preload, &delete);
+
+       seq_printf(seq, "24hr\t\t: yes\n");
+       seq_printf(seq, "preload\t\t: %d\n", preload);
+       seq_printf(seq, "delete\t\t: %d\n", delete);
+
+       return 0;
+}
+
+static struct rtc_class_ops ep93xx_rtc_ops = {
+       .read_time      = ep93xx_rtc_read_time,
+       .set_time       = ep93xx_rtc_set_time,
+       .set_mmss       = ep93xx_rtc_set_mmss,
+       .proc           = ep93xx_rtc_proc,
+};
+
+static ssize_t ep93xx_sysfs_show_comp_preload(struct device *dev,
+                       struct device_attribute *attr, char *buf)
+{
+       unsigned short preload;
+
+       ep93xx_get_swcomp(dev, &preload, NULL);
+
+       return sprintf(buf, "%d\n", preload);
+}
+static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_sysfs_show_comp_preload, NULL);
+
+static ssize_t ep93xx_sysfs_show_comp_delete(struct device *dev,
+                       struct device_attribute *attr, char *buf)
+{
+       unsigned short delete;
+
+       ep93xx_get_swcomp(dev, NULL, &delete);
+
+       return sprintf(buf, "%d\n", delete);
+}
+static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_sysfs_show_comp_delete, NULL);
+
+
+static int __devinit ep93xx_rtc_probe(struct platform_device *dev)
+{
+       struct rtc_device *rtc = rtc_device_register("ep93xx",
+                               &dev->dev, &ep93xx_rtc_ops, THIS_MODULE);
+
+       if (IS_ERR(rtc)) {
+               dev_err(&dev->dev, "unable to register\n");
+               return PTR_ERR(rtc);
+       }
+
+       platform_set_drvdata(dev, rtc);
+
+       device_create_file(&dev->dev, &dev_attr_comp_preload);
+       device_create_file(&dev->dev, &dev_attr_comp_delete);
+
+       return 0;
+}
+
+static int __devexit ep93xx_rtc_remove(struct platform_device *dev)
+{
+       struct rtc_device *rtc = platform_get_drvdata(dev);
+
+       if (rtc)
+               rtc_device_unregister(rtc);
+
+       platform_set_drvdata(dev, NULL);
+
+       return 0;
+}
+
+static struct platform_driver ep93xx_rtc_platform_driver = {
+       .driver         = {
+               .name   = "ep93xx-rtc",
+               .owner  = THIS_MODULE,
+       },
+       .probe          = ep93xx_rtc_probe,
+       .remove         = __devexit_p(ep93xx_rtc_remove),
+};
+
+static int __init ep93xx_rtc_init(void)
+{
+       return platform_driver_register(&ep93xx_rtc_platform_driver);
+}
+
+static void __exit ep93xx_rtc_exit(void)
+{
+       platform_driver_unregister(&ep93xx_rtc_platform_driver);
+}
+
+MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
+MODULE_DESCRIPTION("EP93XX RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+module_init(ep93xx_rtc_init);
+module_exit(ep93xx_rtc_exit);