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[ARM] 5452/1: ep93x: rtc: use ioremap'ed addresses
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Update the rtc-ep93xx driver to use ioremap'ed addresses.

This removes the dependency on <mach/hardware.h> and properly
reports the memory addresses used by the driver in /proc/iomem.

In addition, ep93xx_rtc_init() is updated to use
platform_driver_probe() instead of platform_driver_register().

Also, the device_create_file() calls are now properly checked for
error conditions.  The created sysfs files are also now removed
when the driver is removed.

The version number for the driver has been bumped at the request
of Alessandro Zummo.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Hartley Sweeten authored and Russell King committed Apr 26, 2009
1 parent 924a158 commit 38f7b00
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Showing 3 changed files with 125 additions and 40 deletions.
15 changes: 12 additions & 3 deletions arch/arm/mach-ep93xx/core.c
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Original file line number Diff line number Diff line change
Expand Up @@ -450,10 +450,19 @@ static struct amba_device uart3_device = {
};


static struct resource ep93xx_rtc_resource[] = {
{
.start = EP93XX_RTC_PHYS_BASE,
.end = EP93XX_RTC_PHYS_BASE + 0x10c - 1,
.flags = IORESOURCE_MEM,
},
};

static struct platform_device ep93xx_rtc_device = {
.name = "ep93xx-rtc",
.id = -1,
.num_resources = 0,
.name = "ep93xx-rtc",
.id = -1,
.num_resources = ARRAY_SIZE(ep93xx_rtc_resource),
.resource = ep93xx_rtc_resource,
};


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1 change: 1 addition & 0 deletions arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -147,6 +147,7 @@
#define EP93XX_PWM_BASE (EP93XX_APB_VIRT_BASE + 0x00110000)

#define EP93XX_RTC_BASE (EP93XX_APB_VIRT_BASE + 0x00120000)
#define EP93XX_RTC_PHYS_BASE (EP93XX_APB_PHYS_BASE + 0x00120000)

#define EP93XX_SYSCON_BASE (EP93XX_APB_VIRT_BASE + 0x00130000)
#define EP93XX_SYSCON_REG(x) (EP93XX_SYSCON_BASE + (x))
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149 changes: 112 additions & 37 deletions drivers/rtc/rtc-ep93xx.c
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Original file line number Diff line number Diff line change
Expand Up @@ -12,48 +12,74 @@
#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <mach/hardware.h>
#include <linux/io.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"

#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"
/*
* 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_get_swcomp(struct device *dev, unsigned short *preload,
static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload,
unsigned short *delete)
{
unsigned short comp = __raw_readl(EP93XX_RTC_SWCOMP);
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 & 0xffff;
*preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK)
>> EP93XX_RTC_SWCOMP_INT_SHIFT;

if (delete)
*delete = (comp >> 16) & 0x1f;
*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)
{
unsigned long time = __raw_readl(EP93XX_RTC_DATA);
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)
{
__raw_writel(secs + 1, EP93XX_RTC_LOAD);
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_get_swcomp(dev, &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);
Expand All @@ -67,78 +93,127 @@ static const struct rtc_class_ops ep93xx_rtc_ops = {
.proc = ep93xx_rtc_proc,
};

static ssize_t ep93xx_sysfs_show_comp_preload(struct device *dev,
static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev,
struct device_attribute *attr, char *buf)
{
unsigned short preload;

ep93xx_get_swcomp(dev, &preload, NULL);
ep93xx_rtc_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 DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL);

static ssize_t ep93xx_sysfs_show_comp_delete(struct device *dev,
static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev,
struct device_attribute *attr, char *buf)
{
unsigned short delete;

ep93xx_get_swcomp(dev, NULL, &delete);
ep93xx_rtc_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 DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL);


static int __devinit ep93xx_rtc_probe(struct platform_device *dev)
static int __init ep93xx_rtc_probe(struct platform_device *pdev)
{
struct rtc_device *rtc = rtc_device_register("ep93xx",
&dev->dev, &ep93xx_rtc_ops, THIS_MODULE);
struct ep93xx_rtc *ep93xx_rtc;
struct resource *res;
struct rtc_device *rtc;
int err;

ep93xx_rtc = kzalloc(sizeof(struct ep93xx_rtc), GFP_KERNEL);
if (ep93xx_rtc == NULL)
return -ENOMEM;

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL)
return -ENXIO;

res = request_mem_region(res->start, resource_size(res), pdev->name);
if (res == NULL)
return -EBUSY;

ep93xx_rtc->mmio_base = ioremap(res->start, resource_size(res));
if (ep93xx_rtc->mmio_base == NULL) {
err = -ENXIO;
goto fail;
}

pdev->dev.platform_data = ep93xx_rtc;

rtc = rtc_device_register(pdev->name,
&pdev->dev, &ep93xx_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc)) {
return PTR_ERR(rtc);
err = PTR_ERR(rtc);
goto fail;
}

platform_set_drvdata(dev, rtc);
platform_set_drvdata(pdev, rtc);

device_create_file(&dev->dev, &dev_attr_comp_preload);
device_create_file(&dev->dev, &dev_attr_comp_delete);
err = device_create_file(&pdev->dev, &dev_attr_comp_preload);
if (err)
goto fail;
err = device_create_file(&pdev->dev, &dev_attr_comp_delete);
if (err) {
device_remove_file(&pdev->dev, &dev_attr_comp_preload);
goto fail;
}

return 0;

fail:
if (ep93xx_rtc->mmio_base) {
iounmap(ep93xx_rtc->mmio_base);
pdev->dev.platform_data = NULL;
}
release_mem_region(res->start, resource_size(res));
return err;
}

static int __devexit ep93xx_rtc_remove(struct platform_device *dev)
static int __exit ep93xx_rtc_remove(struct platform_device *pdev)
{
struct rtc_device *rtc = platform_get_drvdata(dev);
struct rtc_device *rtc = platform_get_drvdata(pdev);
struct ep93xx_rtc *ep93xx_rtc = pdev->dev.platform_data;
struct resource *res;

/* cleanup sysfs */
device_remove_file(&pdev->dev, &dev_attr_comp_delete);
device_remove_file(&pdev->dev, &dev_attr_comp_preload);

rtc_device_unregister(rtc);

iounmap(ep93xx_rtc->mmio_base);
pdev->dev.platform_data = NULL;

if (rtc)
rtc_device_unregister(rtc);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(res->start, resource_size(res));

platform_set_drvdata(dev, NULL);
platform_set_drvdata(pdev, NULL);

return 0;
}

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:ep93xx-rtc");

static struct platform_driver ep93xx_rtc_platform_driver = {
static struct platform_driver ep93xx_rtc_driver = {
.driver = {
.name = "ep93xx-rtc",
.owner = THIS_MODULE,
},
.probe = ep93xx_rtc_probe,
.remove = __devexit_p(ep93xx_rtc_remove),
.remove = __exit_p(ep93xx_rtc_remove),
};

static int __init ep93xx_rtc_init(void)
{
return platform_driver_register(&ep93xx_rtc_platform_driver);
return platform_driver_probe(&ep93xx_rtc_driver, ep93xx_rtc_probe);
}

static void __exit ep93xx_rtc_exit(void)
{
platform_driver_unregister(&ep93xx_rtc_platform_driver);
platform_driver_unregister(&ep93xx_rtc_driver);
}

MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
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