166 lines
4.0 KiB
C
166 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* A driver for the RTC embedded in the Cirrus Logic EP93XX processors
|
|
* Copyright (c) 2006 Tower Technologies
|
|
*
|
|
* Author: Alessandro Zummo <a.zummo@towertech.it>
|
|
*/
|
|
|
|
#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 BIT(0)
|
|
#define EP93XX_RTC_LOAD 0x00C
|
|
#define EP93XX_RTC_CONTROL 0x010
|
|
#define EP93XX_RTC_CONTROL_MIE BIT(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
|
|
|
|
struct ep93xx_rtc {
|
|
void __iomem *mmio_base;
|
|
struct rtc_device *rtc;
|
|
};
|
|
|
|
static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload,
|
|
unsigned short *delete)
|
|
{
|
|
struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
|
|
unsigned long comp;
|
|
|
|
comp = 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_get_platdata(dev);
|
|
unsigned long time;
|
|
|
|
time = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA);
|
|
|
|
rtc_time64_to_tm(time, tm);
|
|
return 0;
|
|
}
|
|
|
|
static int ep93xx_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
|
|
unsigned long secs = rtc_tm_to_time64(tm);
|
|
|
|
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_time = ep93xx_rtc_set_time,
|
|
.proc = ep93xx_rtc_proc,
|
|
};
|
|
|
|
static ssize_t comp_preload_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
unsigned short preload;
|
|
|
|
ep93xx_rtc_get_swcomp(dev->parent, &preload, NULL);
|
|
|
|
return sprintf(buf, "%d\n", preload);
|
|
}
|
|
static DEVICE_ATTR_RO(comp_preload);
|
|
|
|
static ssize_t comp_delete_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
unsigned short delete;
|
|
|
|
ep93xx_rtc_get_swcomp(dev->parent, NULL, &delete);
|
|
|
|
return sprintf(buf, "%d\n", delete);
|
|
}
|
|
static DEVICE_ATTR_RO(comp_delete);
|
|
|
|
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 ep93xx_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct ep93xx_rtc *ep93xx_rtc;
|
|
struct resource *res;
|
|
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);
|
|
ep93xx_rtc->mmio_base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(ep93xx_rtc->mmio_base))
|
|
return PTR_ERR(ep93xx_rtc->mmio_base);
|
|
|
|
platform_set_drvdata(pdev, ep93xx_rtc);
|
|
|
|
ep93xx_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
|
|
if (IS_ERR(ep93xx_rtc->rtc))
|
|
return PTR_ERR(ep93xx_rtc->rtc);
|
|
|
|
ep93xx_rtc->rtc->ops = &ep93xx_rtc_ops;
|
|
ep93xx_rtc->rtc->range_max = U32_MAX;
|
|
|
|
err = rtc_add_group(ep93xx_rtc->rtc, &ep93xx_rtc_sysfs_files);
|
|
if (err)
|
|
return err;
|
|
|
|
return rtc_register_device(ep93xx_rtc->rtc);
|
|
}
|
|
|
|
static struct platform_driver ep93xx_rtc_driver = {
|
|
.driver = {
|
|
.name = "ep93xx-rtc",
|
|
},
|
|
.probe = ep93xx_rtc_probe,
|
|
};
|
|
|
|
module_platform_driver(ep93xx_rtc_driver);
|
|
|
|
MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
|
|
MODULE_DESCRIPTION("EP93XX RTC driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:ep93xx-rtc");
|