diff options
Diffstat (limited to 'drivers/rtc/rtc-tx4939.c')
| -rw-r--r-- | drivers/rtc/rtc-tx4939.c | 296 |
1 files changed, 0 insertions, 296 deletions
diff --git a/drivers/rtc/rtc-tx4939.c b/drivers/rtc/rtc-tx4939.c deleted file mode 100644 index 560d9a5e0225..000000000000 --- a/drivers/rtc/rtc-tx4939.c +++ /dev/null @@ -1,296 +0,0 @@ -/* - * TX4939 internal RTC driver - * Based on RBTX49xx patch from CELF patch archive. - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * (C) Copyright TOSHIBA CORPORATION 2005-2007 - */ -#include <linux/rtc.h> -#include <linux/platform_device.h> -#include <linux/interrupt.h> -#include <linux/module.h> -#include <linux/io.h> -#include <linux/gfp.h> -#include <asm/txx9/tx4939.h> - -struct tx4939rtc_plat_data { - struct rtc_device *rtc; - struct tx4939_rtc_reg __iomem *rtcreg; - spinlock_t lock; -}; - -static struct tx4939rtc_plat_data *get_tx4939rtc_plat_data(struct device *dev) -{ - return platform_get_drvdata(to_platform_device(dev)); -} - -static int tx4939_rtc_cmd(struct tx4939_rtc_reg __iomem *rtcreg, int cmd) -{ - int i = 0; - - __raw_writel(cmd, &rtcreg->ctl); - /* This might take 30us (next 32.768KHz clock) */ - while (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_BUSY) { - /* timeout on approx. 100us (@ GBUS200MHz) */ - if (i++ > 200 * 100) - return -EBUSY; - cpu_relax(); - } - return 0; -} - -static int tx4939_rtc_set_mmss(struct device *dev, unsigned long secs) -{ - struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); - struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; - int i, ret; - unsigned char buf[6]; - - buf[0] = 0; - buf[1] = 0; - buf[2] = secs; - buf[3] = secs >> 8; - buf[4] = secs >> 16; - buf[5] = secs >> 24; - spin_lock_irq(&pdata->lock); - __raw_writel(0, &rtcreg->adr); - for (i = 0; i < 6; i++) - __raw_writel(buf[i], &rtcreg->dat); - ret = tx4939_rtc_cmd(rtcreg, - TX4939_RTCCTL_COMMAND_SETTIME | - (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME)); - spin_unlock_irq(&pdata->lock); - return ret; -} - -static int tx4939_rtc_read_time(struct device *dev, struct rtc_time *tm) -{ - struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); - struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; - int i, ret; - unsigned long sec; - unsigned char buf[6]; - - spin_lock_irq(&pdata->lock); - ret = tx4939_rtc_cmd(rtcreg, - TX4939_RTCCTL_COMMAND_GETTIME | - (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME)); - if (ret) { - spin_unlock_irq(&pdata->lock); - return ret; - } - __raw_writel(2, &rtcreg->adr); - for (i = 2; i < 6; i++) - buf[i] = __raw_readl(&rtcreg->dat); - spin_unlock_irq(&pdata->lock); - sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2]; - rtc_time_to_tm(sec, tm); - return rtc_valid_tm(tm); -} - -static int tx4939_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) -{ - struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); - struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; - int i, ret; - unsigned long sec; - unsigned char buf[6]; - - if (alrm->time.tm_sec < 0 || - alrm->time.tm_min < 0 || - alrm->time.tm_hour < 0 || - alrm->time.tm_mday < 0 || - alrm->time.tm_mon < 0 || - alrm->time.tm_year < 0) - return -EINVAL; - rtc_tm_to_time(&alrm->time, &sec); - buf[0] = 0; - buf[1] = 0; - buf[2] = sec; - buf[3] = sec >> 8; - buf[4] = sec >> 16; - buf[5] = sec >> 24; - spin_lock_irq(&pdata->lock); - __raw_writel(0, &rtcreg->adr); - for (i = 0; i < 6; i++) - __raw_writel(buf[i], &rtcreg->dat); - ret = tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_SETALARM | - (alrm->enabled ? TX4939_RTCCTL_ALME : 0)); - spin_unlock_irq(&pdata->lock); - return ret; -} - -static int tx4939_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) -{ - struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); - struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; - int i, ret; - unsigned long sec; - unsigned char buf[6]; - u32 ctl; - - spin_lock_irq(&pdata->lock); - ret = tx4939_rtc_cmd(rtcreg, - TX4939_RTCCTL_COMMAND_GETALARM | - (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME)); - if (ret) { - spin_unlock_irq(&pdata->lock); - return ret; - } - __raw_writel(2, &rtcreg->adr); - for (i = 2; i < 6; i++) - buf[i] = __raw_readl(&rtcreg->dat); - ctl = __raw_readl(&rtcreg->ctl); - alrm->enabled = (ctl & TX4939_RTCCTL_ALME) ? 1 : 0; - alrm->pending = (ctl & TX4939_RTCCTL_ALMD) ? 1 : 0; - spin_unlock_irq(&pdata->lock); - sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2]; - rtc_time_to_tm(sec, &alrm->time); - return rtc_valid_tm(&alrm->time); -} - -static int tx4939_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) -{ - struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); - - spin_lock_irq(&pdata->lock); - tx4939_rtc_cmd(pdata->rtcreg, - TX4939_RTCCTL_COMMAND_NOP | - (enabled ? TX4939_RTCCTL_ALME : 0)); - spin_unlock_irq(&pdata->lock); - return 0; -} - -static irqreturn_t tx4939_rtc_interrupt(int irq, void *dev_id) -{ - struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev_id); - struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; - unsigned long events = RTC_IRQF; - - spin_lock(&pdata->lock); - if (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALMD) { - events |= RTC_AF; - tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_NOP); - } - spin_unlock(&pdata->lock); - rtc_update_irq(pdata->rtc, 1, events); - - return IRQ_HANDLED; -} - -static const struct rtc_class_ops tx4939_rtc_ops = { - .read_time = tx4939_rtc_read_time, - .read_alarm = tx4939_rtc_read_alarm, - .set_alarm = tx4939_rtc_set_alarm, - .set_mmss = tx4939_rtc_set_mmss, - .alarm_irq_enable = tx4939_rtc_alarm_irq_enable, -}; - -static ssize_t tx4939_rtc_nvram_read(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t pos, size_t size) -{ - struct device *dev = container_of(kobj, struct device, kobj); - struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); - struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; - ssize_t count; - - spin_lock_irq(&pdata->lock); - for (count = 0; count < size; count++) { - __raw_writel(pos++, &rtcreg->adr); - *buf++ = __raw_readl(&rtcreg->dat); - } - spin_unlock_irq(&pdata->lock); - return count; -} - -static ssize_t tx4939_rtc_nvram_write(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t pos, size_t size) -{ - struct device *dev = container_of(kobj, struct device, kobj); - struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); - struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; - ssize_t count; - - spin_lock_irq(&pdata->lock); - for (count = 0; count < size; count++) { - __raw_writel(pos++, &rtcreg->adr); - __raw_writel(*buf++, &rtcreg->dat); - } - spin_unlock_irq(&pdata->lock); - return count; -} - -static struct bin_attribute tx4939_rtc_nvram_attr = { - .attr = { - .name = "nvram", - .mode = S_IRUGO | S_IWUSR, - }, - .size = TX4939_RTC_REG_RAMSIZE, - .read = tx4939_rtc_nvram_read, - .write = tx4939_rtc_nvram_write, -}; - -static int __init tx4939_rtc_probe(struct platform_device *pdev) -{ - struct rtc_device *rtc; - struct tx4939rtc_plat_data *pdata; - struct resource *res; - int irq, ret; - - irq = platform_get_irq(pdev, 0); - if (irq < 0) - return -ENODEV; - pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); - if (!pdata) - return -ENOMEM; - platform_set_drvdata(pdev, pdata); - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - pdata->rtcreg = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(pdata->rtcreg)) - return PTR_ERR(pdata->rtcreg); - - spin_lock_init(&pdata->lock); - tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP); - if (devm_request_irq(&pdev->dev, irq, tx4939_rtc_interrupt, - 0, pdev->name, &pdev->dev) < 0) - return -EBUSY; - rtc = devm_rtc_device_register(&pdev->dev, pdev->name, - &tx4939_rtc_ops, THIS_MODULE); - if (IS_ERR(rtc)) - return PTR_ERR(rtc); - pdata->rtc = rtc; - ret = sysfs_create_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr); - - return ret; -} - -static int __exit tx4939_rtc_remove(struct platform_device *pdev) -{ - struct tx4939rtc_plat_data *pdata = platform_get_drvdata(pdev); - - sysfs_remove_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr); - spin_lock_irq(&pdata->lock); - tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP); - spin_unlock_irq(&pdata->lock); - return 0; -} - -static struct platform_driver tx4939_rtc_driver = { - .remove = __exit_p(tx4939_rtc_remove), - .driver = { - .name = "tx4939rtc", - }, -}; - -module_platform_driver_probe(tx4939_rtc_driver, tx4939_rtc_probe); - -MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>"); -MODULE_DESCRIPTION("TX4939 internal RTC driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:tx4939rtc"); |