diff options
Diffstat (limited to 'drivers/rtc/rtc-ep93xx.c')
| -rw-r--r-- | drivers/rtc/rtc-ep93xx.c | 216 |
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..14a42a1e --- /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; + 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->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; + 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, ep93xx_rtc); + + ep93xx_rtc->rtc = rtc_device_register(pdev->name, + &pdev->dev, &ep93xx_rtc_ops, THIS_MODULE); + if (IS_ERR(ep93xx_rtc->rtc)) { + err = PTR_ERR(ep93xx_rtc->rtc); + goto exit; + } + + err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files); + if (err) + goto fail; + + return 0; + +fail: + rtc_device_unregister(ep93xx_rtc->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 ep93xx_rtc *ep93xx_rtc = platform_get_drvdata(pdev); + + sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files); + platform_set_drvdata(pdev, NULL); + rtc_device_unregister(ep93xx_rtc->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); |