[PATCH] ARM: NUC900: add rtc controller driver support for NUC900
Wan ZongShun
mcuos.com at gmail.com
Sun Nov 22 13:14:56 EST 2009
Dear sirs,
This is a RTC driver patch support for NUC910 and NUC920 processors of Winbind/Nuvoton NUC900 ARM series.
Signed-off-by: Wan ZongShun <mcuos.com at gmail.com>
---
drivers/rtc/Kconfig | 6 +
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-nuc900.c | 347 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 354 insertions(+), 0 deletions(-)
create mode 100644 drivers/rtc/rtc-nuc900.c
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 3c20dae..266ce62 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -573,6 +573,12 @@ config RTC_DRV_AB3100
Select this to enable the ST-Ericsson AB3100 Mixed Signal IC RTC
support. This chip contains a battery- and capacitor-backed RTC.
+config RTC_DRV_NUC900
+ tristate "NUC910/NUC920 RTC driver"
+ depends on RTC_CLASS && ARCH_W90X900
+ help
+ If you say yes here you get support for the RTC subsystem of the
+ NUC910/NUC920 used in embedded systems.
comment "on-CPU RTC drivers"
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index aa3fbd5..6338887 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -85,3 +85,4 @@ obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o
obj-$(CONFIG_RTC_DRV_WM831X) += rtc-wm831x.o
obj-$(CONFIG_RTC_DRV_WM8350) += rtc-wm8350.o
obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o
+obj-$(CONFIG_RTC_DRV_NUC900) += rtc-nuc900.o
diff --git a/drivers/rtc/rtc-nuc900.c b/drivers/rtc/rtc-nuc900.c
new file mode 100644
index 0000000..5059fdc
--- /dev/null
+++ b/drivers/rtc/rtc-nuc900.c
@@ -0,0 +1,347 @@
+/*
+ * Copyright (c) 2008-2009 Nuvoton technology corporation.
+ *
+ * Wan ZongShun <mcuos.com at gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;version 2 of the License.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/time.h>
+#include <linux/rtc.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/ioctl.h>
+#include <linux/io.h>
+#include <linux/bcd.h>
+
+/* RTC Control Registers */
+#define REG_RTC_INIR 0x00
+#define REG_RTC_AER 0x04
+#define REG_RTC_FCR 0x08
+#define REG_RTC_TLR 0x0C
+#define REG_RTC_CLR 0x10
+#define REG_RTC_TSSR 0x14
+#define REG_RTC_DWR 0x18
+#define REG_RTC_TAR 0x1C
+#define REG_RTC_CAR 0x20
+#define REG_RTC_LIR 0x24
+#define REG_RTC_RIER 0x28
+#define REG_RTC_RIIR 0x2C
+#define REG_RTC_TTR 0x30
+
+#define RTCSET 0x01
+#define AERRWENB 0x10000
+#define INIRRESET 0xa5eb1357
+#define AERPOWERON 0xA965
+#define AERPOWEROFF 0x0000
+#define LEAPYEAR 0x0001
+#define TICKENB 0x80
+#define TICKINTENB 0x0002
+#define ALARMINTENB 0x0001
+
+struct nuc900_rtc {
+ int irq_num;
+ void __iomem *rtc_reg;
+ struct rtc_device *rtcdev;
+ spinlock_t lock;
+};
+
+static const unsigned char days_in_mo[] = {
+0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+
+static irqreturn_t nuc900_rtc_interrupt(int irq, void *_rtc)
+{
+ struct nuc900_rtc *rtc = _rtc;
+ unsigned long events = 0, rtc_irq;
+
+ rtc_irq = __raw_readl(rtc->rtc_reg + REG_RTC_RIIR);
+
+ if (rtc_irq & ALARMINTENB) {
+ rtc_irq &= ~ALARMINTENB;
+ __raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR);
+ events |= RTC_AF | RTC_IRQF;
+ }
+
+ if (rtc_irq & TICKINTENB) {
+ rtc_irq &= ~TICKINTENB;
+ __raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR);
+ events |= RTC_UF | RTC_IRQF;
+ }
+
+ rtc_update_irq(rtc->rtcdev, 1, events);
+
+ return IRQ_HANDLED;
+}
+
+static void check_rtc_power(struct nuc900_rtc *nuc900_rtc)
+{
+ unsigned int i;
+ __raw_writel(INIRRESET, nuc900_rtc->rtc_reg + REG_RTC_INIR);
+
+ mdelay(10);
+
+ __raw_writel(AERPOWERON, nuc900_rtc->rtc_reg + REG_RTC_AER);
+
+ for (i = 0; i < 1000000; i++) {
+ if (__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB)
+ break;
+ }
+}
+
+static void nuc900_rtc_decodetime(unsigned int timereg,
+ unsigned int calreg, struct rtc_time *tm)
+{
+ tm->tm_mday = bcd2bin(calreg >> 0);
+ tm->tm_mon = bcd2bin(calreg >> 8);
+ tm->tm_year = bcd2bin(calreg >> 16) + 2000;
+
+ tm->tm_sec = bcd2bin(timereg >> 0);
+ tm->tm_min = bcd2bin(timereg >> 8);
+ tm->tm_hour = bcd2bin(timereg >> 16);
+}
+
+static void nuc900_rtc_encodetime(struct rtc_time *settm,
+ struct rtc_time *gettm)
+{
+ gettm->tm_mday = bin2bcd((settm->tm_mday) << 0);
+ gettm->tm_mon = bin2bcd((settm->tm_mon) << 8);
+ gettm->tm_year = bin2bcd((settm->tm_year) << 16) - 2000;
+
+ gettm->tm_sec = bin2bcd((settm->tm_sec) << 0);
+ gettm->tm_min = bin2bcd((settm->tm_min) << 8);
+ gettm->tm_hour = bin2bcd((settm->tm_hour) << 16);
+}
+
+static int nuc900_rtc_ioctl(struct device *dev, unsigned int cmd,
+ unsigned long arg)
+{
+ struct nuc900_rtc *rtc = dev_get_drvdata(dev);
+ int ret = 0;
+ unsigned int val;
+ unsigned long flags;
+
+ spin_lock_irqsave(&rtc->lock, flags);
+
+ val = __raw_readl(rtc->rtc_reg + REG_RTC_RIER);
+
+ switch (cmd) {
+ case RTC_AIE_OFF: /* alarm off */
+ val &= (~ALARMINTENB);
+ break;
+ case RTC_AIE_ON: /* alarm on */
+ val |= ALARMINTENB;
+ break;
+ case RTC_UIE_OFF: /* update off */
+ val &= (~TICKINTENB);
+ break;
+ case RTC_UIE_ON: /* update on */
+ val |= TICKINTENB;
+ break;
+ default:
+ ret = -ENOIOCTLCMD;
+ break;
+ }
+
+ __raw_writel(val, rtc->rtc_reg + REG_RTC_RIER);
+
+ spin_unlock_irqrestore(&rtc->lock, flags);
+
+ return ret;
+}
+
+static int nuc900_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct nuc900_rtc *rtc = dev_get_drvdata(dev);
+ unsigned int timeval, clrval;
+
+ timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TLR);
+ clrval = __raw_readl(rtc->rtc_reg + REG_RTC_CLR);
+
+ nuc900_rtc_decodetime(timeval, clrval, tm);
+
+ return 0;
+}
+
+static int nuc900_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct nuc900_rtc *rtc = dev_get_drvdata(dev);
+ struct rtc_time gettm;
+ unsigned char leap_yr;
+ unsigned long val;
+
+ nuc900_rtc_encodetime(tm, &gettm);
+
+ check_rtc_power(rtc);
+
+ leap_yr = __raw_readl(rtc->rtc_reg + REG_RTC_LIR) & LEAPYEAR;
+
+ if ((gettm.tm_mon > 12) || (gettm.tm_mday == 0))
+ return -EINVAL;
+ if (gettm.tm_mday > (days_in_mo[gettm.tm_mon] +
+ ((gettm.tm_mon == 2) && leap_yr)))
+ return -EINVAL;
+ if ((gettm.tm_hour >= 24) || (gettm.tm_min >= 60) ||
+ (gettm.tm_sec >= 60))
+ return -EINVAL;
+
+ val = gettm.tm_mday | gettm.tm_mon | gettm.tm_year;
+ __raw_writel(val, rtc->rtc_reg + REG_RTC_CLR);
+
+ val = gettm.tm_sec | gettm.tm_min | gettm.tm_hour;
+ __raw_writel(val, rtc->rtc_reg + REG_RTC_TLR);
+
+ return 0;
+}
+
+static int nuc900_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct nuc900_rtc *rtc = dev_get_drvdata(dev);
+ unsigned int timeval, carval;
+
+ timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TAR);
+ carval = __raw_readl(rtc->rtc_reg + REG_RTC_CAR);
+
+ nuc900_rtc_decodetime(timeval, carval, &alrm->time);
+
+ return 0;
+}
+
+static int nuc900_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct nuc900_rtc *rtc = dev_get_drvdata(dev);
+ struct rtc_time tm;
+ unsigned long val;
+
+ nuc900_rtc_encodetime(&alrm->time, &tm);
+
+ check_rtc_power(rtc);
+
+ val = tm.tm_mday | tm.tm_mon | tm.tm_year;
+ __raw_writel(val, rtc->rtc_reg + REG_RTC_CAR);
+
+ val = tm.tm_sec | tm.tm_min | tm.tm_hour;
+ __raw_writel(val, rtc->rtc_reg + REG_RTC_TAR);
+
+ if (alrm->enabled) {
+ __raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)|
+ (ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER);
+ }
+
+ return 0;
+}
+
+static struct rtc_class_ops nuc900_rtc_ops = {
+ .ioctl = nuc900_rtc_ioctl,
+ .read_time = nuc900_rtc_read_time,
+ .set_time = nuc900_rtc_set_time,
+ .read_alarm = nuc900_rtc_read_alarm,
+ .set_alarm = nuc900_rtc_set_alarm,
+};
+
+static int __devinit nuc900_rtc_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct nuc900_rtc *nuc900_rtc;
+ int err;
+
+ nuc900_rtc = kzalloc(sizeof(struct nuc900_rtc), GFP_KERNEL);
+ if (!nuc900_rtc) {
+ err = -ENOMEM;
+ goto fail1;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ err = -ENXIO;
+ goto fail1;
+ }
+
+ if (!request_mem_region(res->start, resource_size(res),
+ pdev->name)) {
+ err = -EBUSY;
+ goto fail1;
+ }
+
+ nuc900_rtc->rtc_reg = ioremap(res->start, resource_size(res));
+ if (!nuc900_rtc->rtc_reg) {
+ err = -ENOMEM;
+ goto fail2;
+ }
+
+ nuc900_rtc->irq_num = platform_get_irq(pdev, 0);
+ if (request_irq(nuc900_rtc->irq_num, nuc900_rtc_interrupt,
+ IRQF_DISABLED, "nuc900rtc", nuc900_rtc)) {
+ err = -EBUSY;
+ goto fail3;
+ }
+
+ nuc900_rtc->rtcdev = rtc_device_register(pdev->name, &pdev->dev,
+ &nuc900_rtc_ops, THIS_MODULE);
+ if (IS_ERR(nuc900_rtc->rtcdev)) {
+ err = PTR_ERR(nuc900_rtc->rtcdev);
+ goto fail4;
+ }
+ platform_set_drvdata(pdev, nuc900_rtc->rtcdev);
+ spin_lock_init(&nuc900_rtc->lock);
+
+ return 0;
+
+fail4: free_irq(nuc900_rtc->irq_num, nuc900_rtc);
+fail3: iounmap(nuc900_rtc->rtc_reg);
+fail2: release_mem_region(res->start, resource_size(res));
+fail1: kfree(nuc900_rtc);
+ return err;
+}
+
+static int __devexit nuc900_rtc_remove(struct platform_device *pdev)
+{
+ struct nuc900_rtc *nuc900_rtc = platform_get_drvdata(pdev);
+ struct resource *res;
+
+ free_irq(nuc900_rtc->irq_num, nuc900_rtc);
+ iounmap(nuc900_rtc->rtc_reg);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ release_mem_region(res->start, resource_size(res));
+
+ rtc_device_unregister(nuc900_rtc->rtcdev);
+ kfree(nuc900_rtc);
+
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver nuc900_rtc_driver = {
+ .probe = nuc900_rtc_probe,
+ .remove = __devexit_p(nuc900_rtc_remove),
+ .driver = {
+ .name = "nuc900-rtc",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init nuc900_rtc_init(void)
+{
+ return platform_driver_register(&nuc900_rtc_driver);
+}
+
+static void __exit nuc900_rtc_exit(void)
+{
+ platform_driver_unregister(&nuc900_rtc_driver);
+}
+
+module_init(nuc900_rtc_init);
+module_exit(nuc900_rtc_exit);
+
+MODULE_AUTHOR("Wan ZongShun <mcuos.com at gmail.com>");
+MODULE_DESCRIPTION("nuc910/nuc920 RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:nuc900-rtc");
--
1.5.6.3
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