initial_commit

1 files changed, 216 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-ep93xx.c b/drivers/rtc/rtc-ep93xx.c
new file mode 100644
index 00000000..335551d3
--- /dev/null
+++ b/drivers/rtc/rtc-ep93xx.c
@@ -0,0 +1,216 @@
+/*
+ * 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 <linux/io.h>
+#include <linux/gfp.h>
+
+#define EP93XX_RTC_DATA			0x000
+#define EP93XX_RTC_MATCH		0x004
+#define EP93XX_RTC_STATUS		0x008
+#define  EP93XX_RTC_STATUS_INTR		 (1<<0)
+#define EP93XX_RTC_LOAD			0x00C
+#define EP93XX_RTC_CONTROL		0x010
+#define  EP93XX_RTC_CONTROL_MIE		 (1<<0)
+#define EP93XX_RTC_SWCOMP		0x108
+#define  EP93XX_RTC_SWCOMP_DEL_MASK	 0x001f0000
+#define  EP93XX_RTC_SWCOMP_DEL_SHIFT	 16
+#define  EP93XX_RTC_SWCOMP_INT_MASK	 0x0000ffff
+#define  EP93XX_RTC_SWCOMP_INT_SHIFT	 0
+
+#define DRV_VERSION "0.3"
+
+/*
+ * struct device dev.platform_data is used to store our private data
+ * because struct rtc_device does not have a variable to hold it.
+ */
+struct ep93xx_rtc {
+	void __iomem	*mmio_base;
+};
+
+static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload,
+				unsigned short *delete)
+{
+	struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
+	unsigned long comp;
+
+	comp = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP);
+
+	if (preload)
+		*preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK)
+				>> EP93XX_RTC_SWCOMP_INT_SHIFT;
+
+	if (delete)
+		*delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK)
+				>> EP93XX_RTC_SWCOMP_DEL_SHIFT;
+
+	return 0;
+}
+
+static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
+	unsigned long time;
+
+	 time = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA);
+
+	rtc_time_to_tm(time, tm);
+	return 0;
+}
+
+static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
+{
+	struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
+
+	__raw_writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD);
+	return 0;
+}
+
+static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq)
+{
+	unsigned short preload, delete;
+
+	ep93xx_rtc_get_swcomp(dev, &preload, &delete);
+
+	seq_printf(seq, "preload\t\t: %d\n", preload);
+	seq_printf(seq, "delete\t\t: %d\n", delete);
+
+	return 0;
+}
+
+static const struct rtc_class_ops ep93xx_rtc_ops = {
+	.read_time	= ep93xx_rtc_read_time,
+	.set_mmss	= ep93xx_rtc_set_mmss,
+	.proc		= ep93xx_rtc_proc,
+};
+
+static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	unsigned short preload;
+
+	ep93xx_rtc_get_swcomp(dev, &preload, NULL);
+
+	return sprintf(buf, "%d\n", preload);
+}
+static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL);
+
+static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	unsigned short delete;
+
+	ep93xx_rtc_get_swcomp(dev, NULL, &delete);
+
+	return sprintf(buf, "%d\n", delete);
+}
+static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL);
+
+static struct attribute *ep93xx_rtc_attrs[] = {
+	&dev_attr_comp_preload.attr,
+	&dev_attr_comp_delete.attr,
+	NULL
+};
+
+static const struct attribute_group ep93xx_rtc_sysfs_files = {
+	.attrs	= ep93xx_rtc_attrs,
+};
+
+static int __init ep93xx_rtc_probe(struct platform_device *pdev)
+{
+	struct ep93xx_rtc *ep93xx_rtc;
+	struct resource *res;
+	struct rtc_device *rtc;
+	int err;
+
+	ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL);
+	if (!ep93xx_rtc)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENXIO;
+
+	if (!devm_request_mem_region(&pdev->dev, res->start,
+				     resource_size(res), pdev->name))
+		return -EBUSY;
+
+	ep93xx_rtc->mmio_base = devm_ioremap(&pdev->dev, res->start,
+					     resource_size(res));
+	if (!ep93xx_rtc->mmio_base)
+		return -ENXIO;
+
+	pdev->dev.platform_data = ep93xx_rtc;
+	platform_set_drvdata(pdev, rtc);
+
+	rtc = rtc_device_register(pdev->name,
+				&pdev->dev, &ep93xx_rtc_ops, THIS_MODULE);
+	if (IS_ERR(rtc)) {
+		err = PTR_ERR(rtc);
+		goto exit;
+	}
+
+	err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
+	if (err)
+		goto fail;
+
+	return 0;
+
+fail:
+	rtc_device_unregister(rtc);
+exit:
+	platform_set_drvdata(pdev, NULL);
+	pdev->dev.platform_data = NULL;
+	return err;
+}
+
+static int __exit ep93xx_rtc_remove(struct platform_device *pdev)
+{
+	struct rtc_device *rtc = platform_get_drvdata(pdev);
+
+	sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
+	platform_set_drvdata(pdev, NULL);
+	rtc_device_unregister(rtc);
+	pdev->dev.platform_data = NULL;
+
+	return 0;
+}
+
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:ep93xx-rtc");
+
+static struct platform_driver ep93xx_rtc_driver = {
+	.driver		= {
+		.name	= "ep93xx-rtc",
+		.owner	= THIS_MODULE,
+	},
+	.remove		= __exit_p(ep93xx_rtc_remove),
+};
+
+static int __init ep93xx_rtc_init(void)
+{
+        return platform_driver_probe(&ep93xx_rtc_driver, ep93xx_rtc_probe);
+}
+
+static void __exit ep93xx_rtc_exit(void)
+{
+	platform_driver_unregister(&ep93xx_rtc_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);