123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299 |
- /*
- * 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; size > 0 && pos < TX4939_RTC_REG_RAMSIZE;
- count++, size--) {
- __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; size > 0 && pos < TX4939_RTC_REG_RAMSIZE;
- count++, size--) {
- __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");
|