mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2024-12-09 16:26:55 +00:00
e1bfcceb93
SVN-Revision: 22463
401 lines
10 KiB
Diff
401 lines
10 KiB
Diff
From 21a0c050c7471b9d87e720a84f6733bbe8e19835 Mon Sep 17 00:00:00 2001
|
|
From: Lars-Peter Clausen <lars@metafoo.de>
|
|
Date: Sat, 19 Jun 2010 18:29:50 +0000
|
|
Subject: [PATCH] RTC: Add JZ4740 RTC driver
|
|
|
|
Add support for the RTC unit on JZ4740 SoCs.
|
|
|
|
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
|
|
Cc: Alessandro Zummo <a.zummo@towertech.it>
|
|
Cc: Paul Gortmaker <p_gortmaker@yahoo.com>
|
|
Cc: rtc-linux@googlegroups.com
|
|
Acked-by: Wan ZongShun <mcuos.com@gmail.com>
|
|
Cc: linux-mips@linux-mips.org
|
|
Cc: linux-kernel@vger.kernel.org
|
|
Cc: Alessandro Zummo <a.zummo@towertech.it>,
|
|
Patchwork: https://patchwork.linux-mips.org/patch/1424/
|
|
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
|
|
---
|
|
drivers/rtc/Kconfig | 11 ++
|
|
drivers/rtc/Makefile | 1 +
|
|
drivers/rtc/rtc-jz4740.c | 345 ++++++++++++++++++++++++++++++++++++++++++++++
|
|
3 files changed, 357 insertions(+), 0 deletions(-)
|
|
create mode 100644 drivers/rtc/rtc-jz4740.c
|
|
|
|
--- a/drivers/rtc/Kconfig
|
|
+++ b/drivers/rtc/Kconfig
|
|
@@ -914,4 +914,15 @@ config RTC_DRV_MPC5121
|
|
This driver can also be built as a module. If so, the module
|
|
will be called rtc-mpc5121.
|
|
|
|
+config RTC_DRV_JZ4740
|
|
+ tristate "Ingenic JZ4740 SoC"
|
|
+ depends on RTC_CLASS
|
|
+ depends on MACH_JZ4740
|
|
+ help
|
|
+ If you say yes here you get support for the Ingenic JZ4740 SoC RTC
|
|
+ controller.
|
|
+
|
|
+ This driver can also be buillt as a module. If so, the module
|
|
+ will be called rtc-jz4740.
|
|
+
|
|
endif # RTC_CLASS
|
|
--- a/drivers/rtc/Makefile
|
|
+++ b/drivers/rtc/Makefile
|
|
@@ -47,6 +47,7 @@ obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93
|
|
obj-$(CONFIG_RTC_DRV_FM3130) += rtc-fm3130.o
|
|
obj-$(CONFIG_RTC_DRV_GENERIC) += rtc-generic.o
|
|
obj-$(CONFIG_RTC_DRV_ISL1208) += rtc-isl1208.o
|
|
+obj-$(CONFIG_RTC_DRV_JZ4740) += rtc-jz4740.o
|
|
obj-$(CONFIG_RTC_DRV_M41T80) += rtc-m41t80.o
|
|
obj-$(CONFIG_RTC_DRV_M41T94) += rtc-m41t94.o
|
|
obj-$(CONFIG_RTC_DRV_M48T35) += rtc-m48t35.o
|
|
--- /dev/null
|
|
+++ b/drivers/rtc/rtc-jz4740.c
|
|
@@ -0,0 +1,345 @@
|
|
+/*
|
|
+ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
|
|
+ * JZ4740 SoC RTC driver
|
|
+ *
|
|
+ * 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; either version 2 of the License, or (at your
|
|
+ * option) any later version.
|
|
+ *
|
|
+ * You should have received a copy of the GNU General Public License along
|
|
+ * with this program; if not, write to the Free Software Foundation, Inc.,
|
|
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/kernel.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/platform_device.h>
|
|
+#include <linux/rtc.h>
|
|
+#include <linux/slab.h>
|
|
+#include <linux/spinlock.h>
|
|
+
|
|
+#define JZ_REG_RTC_CTRL 0x00
|
|
+#define JZ_REG_RTC_SEC 0x04
|
|
+#define JZ_REG_RTC_SEC_ALARM 0x08
|
|
+#define JZ_REG_RTC_REGULATOR 0x0C
|
|
+#define JZ_REG_RTC_HIBERNATE 0x20
|
|
+#define JZ_REG_RTC_SCRATCHPAD 0x34
|
|
+
|
|
+#define JZ_RTC_CTRL_WRDY BIT(7)
|
|
+#define JZ_RTC_CTRL_1HZ BIT(6)
|
|
+#define JZ_RTC_CTRL_1HZ_IRQ BIT(5)
|
|
+#define JZ_RTC_CTRL_AF BIT(4)
|
|
+#define JZ_RTC_CTRL_AF_IRQ BIT(3)
|
|
+#define JZ_RTC_CTRL_AE BIT(2)
|
|
+#define JZ_RTC_CTRL_ENABLE BIT(0)
|
|
+
|
|
+struct jz4740_rtc {
|
|
+ struct resource *mem;
|
|
+ void __iomem *base;
|
|
+
|
|
+ struct rtc_device *rtc;
|
|
+
|
|
+ unsigned int irq;
|
|
+
|
|
+ spinlock_t lock;
|
|
+};
|
|
+
|
|
+static inline uint32_t jz4740_rtc_reg_read(struct jz4740_rtc *rtc, size_t reg)
|
|
+{
|
|
+ return readl(rtc->base + reg);
|
|
+}
|
|
+
|
|
+static int jz4740_rtc_wait_write_ready(struct jz4740_rtc *rtc)
|
|
+{
|
|
+ uint32_t ctrl;
|
|
+ int timeout = 1000;
|
|
+
|
|
+ do {
|
|
+ ctrl = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_CTRL);
|
|
+ } while (!(ctrl & JZ_RTC_CTRL_WRDY) && --timeout);
|
|
+
|
|
+ return timeout ? 0 : -EIO;
|
|
+}
|
|
+
|
|
+static inline int jz4740_rtc_reg_write(struct jz4740_rtc *rtc, size_t reg,
|
|
+ uint32_t val)
|
|
+{
|
|
+ int ret;
|
|
+ ret = jz4740_rtc_wait_write_ready(rtc);
|
|
+ if (ret == 0)
|
|
+ writel(val, rtc->base + reg);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int jz4740_rtc_ctrl_set_bits(struct jz4740_rtc *rtc, uint32_t mask,
|
|
+ bool set)
|
|
+{
|
|
+ int ret;
|
|
+ unsigned long flags;
|
|
+ uint32_t ctrl;
|
|
+
|
|
+ spin_lock_irqsave(&rtc->lock, flags);
|
|
+
|
|
+ ctrl = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_CTRL);
|
|
+
|
|
+ /* Don't clear interrupt flags by accident */
|
|
+ ctrl |= JZ_RTC_CTRL_1HZ | JZ_RTC_CTRL_AF;
|
|
+
|
|
+ if (set)
|
|
+ ctrl |= mask;
|
|
+ else
|
|
+ ctrl &= ~mask;
|
|
+
|
|
+ ret = jz4740_rtc_reg_write(rtc, JZ_REG_RTC_CTRL, ctrl);
|
|
+
|
|
+ spin_unlock_irqrestore(&rtc->lock, flags);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int jz4740_rtc_read_time(struct device *dev, struct rtc_time *time)
|
|
+{
|
|
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev);
|
|
+ uint32_t secs, secs2;
|
|
+ int timeout = 5;
|
|
+
|
|
+ /* If the seconds register is read while it is updated, it can contain a
|
|
+ * bogus value. This can be avoided by making sure that two consecutive
|
|
+ * reads have the same value.
|
|
+ */
|
|
+ secs = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_SEC);
|
|
+ secs2 = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_SEC);
|
|
+
|
|
+ while (secs != secs2 && --timeout) {
|
|
+ secs = secs2;
|
|
+ secs2 = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_SEC);
|
|
+ }
|
|
+
|
|
+ if (timeout == 0)
|
|
+ return -EIO;
|
|
+
|
|
+ rtc_time_to_tm(secs, time);
|
|
+
|
|
+ return rtc_valid_tm(time);
|
|
+}
|
|
+
|
|
+static int jz4740_rtc_set_mmss(struct device *dev, unsigned long secs)
|
|
+{
|
|
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev);
|
|
+
|
|
+ return jz4740_rtc_reg_write(rtc, JZ_REG_RTC_SEC, secs);
|
|
+}
|
|
+
|
|
+static int jz4740_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
+{
|
|
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev);
|
|
+ uint32_t secs;
|
|
+ uint32_t ctrl;
|
|
+
|
|
+ secs = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_SEC_ALARM);
|
|
+
|
|
+ ctrl = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_CTRL);
|
|
+
|
|
+ alrm->enabled = !!(ctrl & JZ_RTC_CTRL_AE);
|
|
+ alrm->pending = !!(ctrl & JZ_RTC_CTRL_AF);
|
|
+
|
|
+ rtc_time_to_tm(secs, &alrm->time);
|
|
+
|
|
+ return rtc_valid_tm(&alrm->time);
|
|
+}
|
|
+
|
|
+static int jz4740_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
+{
|
|
+ int ret;
|
|
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev);
|
|
+ unsigned long secs;
|
|
+
|
|
+ rtc_tm_to_time(&alrm->time, &secs);
|
|
+
|
|
+ ret = jz4740_rtc_reg_write(rtc, JZ_REG_RTC_SEC_ALARM, secs);
|
|
+ if (!ret)
|
|
+ ret = jz4740_rtc_ctrl_set_bits(rtc, JZ_RTC_CTRL_AE, alrm->enabled);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int jz4740_rtc_update_irq_enable(struct device *dev, unsigned int enable)
|
|
+{
|
|
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev);
|
|
+ return jz4740_rtc_ctrl_set_bits(rtc, JZ_RTC_CTRL_1HZ_IRQ, enable);
|
|
+}
|
|
+
|
|
+static int jz4740_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
|
|
+{
|
|
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev);
|
|
+ return jz4740_rtc_ctrl_set_bits(rtc, JZ_RTC_CTRL_AF_IRQ, enable);
|
|
+}
|
|
+
|
|
+static struct rtc_class_ops jz4740_rtc_ops = {
|
|
+ .read_time = jz4740_rtc_read_time,
|
|
+ .set_mmss = jz4740_rtc_set_mmss,
|
|
+ .read_alarm = jz4740_rtc_read_alarm,
|
|
+ .set_alarm = jz4740_rtc_set_alarm,
|
|
+ .update_irq_enable = jz4740_rtc_update_irq_enable,
|
|
+ .alarm_irq_enable = jz4740_rtc_alarm_irq_enable,
|
|
+};
|
|
+
|
|
+static irqreturn_t jz4740_rtc_irq(int irq, void *data)
|
|
+{
|
|
+ struct jz4740_rtc *rtc = data;
|
|
+ uint32_t ctrl;
|
|
+ unsigned long events = 0;
|
|
+
|
|
+ ctrl = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_CTRL);
|
|
+
|
|
+ if (ctrl & JZ_RTC_CTRL_1HZ)
|
|
+ events |= (RTC_UF | RTC_IRQF);
|
|
+
|
|
+ if (ctrl & JZ_RTC_CTRL_AF)
|
|
+ events |= (RTC_AF | RTC_IRQF);
|
|
+
|
|
+ rtc_update_irq(rtc->rtc, 1, events);
|
|
+
|
|
+ jz4740_rtc_ctrl_set_bits(rtc, JZ_RTC_CTRL_1HZ | JZ_RTC_CTRL_AF, false);
|
|
+
|
|
+ return IRQ_HANDLED;
|
|
+}
|
|
+
|
|
+void jz4740_rtc_poweroff(struct device *dev)
|
|
+{
|
|
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev);
|
|
+ jz4740_rtc_reg_write(rtc, JZ_REG_RTC_HIBERNATE, 1);
|
|
+}
|
|
+EXPORT_SYMBOL_GPL(jz4740_rtc_poweroff);
|
|
+
|
|
+static int __devinit jz4740_rtc_probe(struct platform_device *pdev)
|
|
+{
|
|
+ int ret;
|
|
+ struct jz4740_rtc *rtc;
|
|
+ uint32_t scratchpad;
|
|
+
|
|
+ rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
|
|
+ if (!rtc)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ rtc->irq = platform_get_irq(pdev, 0);
|
|
+ if (rtc->irq < 0) {
|
|
+ ret = -ENOENT;
|
|
+ dev_err(&pdev->dev, "Failed to get platform irq\n");
|
|
+ goto err_free;
|
|
+ }
|
|
+
|
|
+ rtc->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
+ if (!rtc->mem) {
|
|
+ ret = -ENOENT;
|
|
+ dev_err(&pdev->dev, "Failed to get platform mmio memory\n");
|
|
+ goto err_free;
|
|
+ }
|
|
+
|
|
+ rtc->mem = request_mem_region(rtc->mem->start, resource_size(rtc->mem),
|
|
+ pdev->name);
|
|
+ if (!rtc->mem) {
|
|
+ ret = -EBUSY;
|
|
+ dev_err(&pdev->dev, "Failed to request mmio memory region\n");
|
|
+ goto err_free;
|
|
+ }
|
|
+
|
|
+ rtc->base = ioremap_nocache(rtc->mem->start, resource_size(rtc->mem));
|
|
+ if (!rtc->base) {
|
|
+ ret = -EBUSY;
|
|
+ dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
|
|
+ goto err_release_mem_region;
|
|
+ }
|
|
+
|
|
+ spin_lock_init(&rtc->lock);
|
|
+
|
|
+ platform_set_drvdata(pdev, rtc);
|
|
+
|
|
+ rtc->rtc = rtc_device_register(pdev->name, &pdev->dev, &jz4740_rtc_ops,
|
|
+ THIS_MODULE);
|
|
+ if (IS_ERR(rtc->rtc)) {
|
|
+ ret = PTR_ERR(rtc->rtc);
|
|
+ dev_err(&pdev->dev, "Failed to register rtc device: %d\n", ret);
|
|
+ goto err_iounmap;
|
|
+ }
|
|
+
|
|
+ ret = request_irq(rtc->irq, jz4740_rtc_irq, 0,
|
|
+ pdev->name, rtc);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "Failed to request rtc irq: %d\n", ret);
|
|
+ goto err_unregister_rtc;
|
|
+ }
|
|
+
|
|
+ scratchpad = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_SCRATCHPAD);
|
|
+ if (scratchpad != 0x12345678) {
|
|
+ ret = jz4740_rtc_reg_write(rtc, JZ_REG_RTC_SCRATCHPAD, 0x12345678);
|
|
+ ret = jz4740_rtc_reg_write(rtc, JZ_REG_RTC_SEC, 0);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "Could not write write to RTC registers\n");
|
|
+ goto err_free_irq;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+
|
|
+err_free_irq:
|
|
+ free_irq(rtc->irq, rtc);
|
|
+err_unregister_rtc:
|
|
+ rtc_device_unregister(rtc->rtc);
|
|
+err_iounmap:
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+ iounmap(rtc->base);
|
|
+err_release_mem_region:
|
|
+ release_mem_region(rtc->mem->start, resource_size(rtc->mem));
|
|
+err_free:
|
|
+ kfree(rtc);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int __devexit jz4740_rtc_remove(struct platform_device *pdev)
|
|
+{
|
|
+ struct jz4740_rtc *rtc = platform_get_drvdata(pdev);
|
|
+
|
|
+ free_irq(rtc->irq, rtc);
|
|
+
|
|
+ rtc_device_unregister(rtc->rtc);
|
|
+
|
|
+ iounmap(rtc->base);
|
|
+ release_mem_region(rtc->mem->start, resource_size(rtc->mem));
|
|
+
|
|
+ kfree(rtc);
|
|
+
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+struct platform_driver jz4740_rtc_driver = {
|
|
+ .probe = jz4740_rtc_probe,
|
|
+ .remove = __devexit_p(jz4740_rtc_remove),
|
|
+ .driver = {
|
|
+ .name = "jz4740-rtc",
|
|
+ .owner = THIS_MODULE,
|
|
+ },
|
|
+};
|
|
+
|
|
+static int __init jz4740_rtc_init(void)
|
|
+{
|
|
+ return platform_driver_register(&jz4740_rtc_driver);
|
|
+}
|
|
+module_init(jz4740_rtc_init);
|
|
+
|
|
+static void __exit jz4740_rtc_exit(void)
|
|
+{
|
|
+ platform_driver_unregister(&jz4740_rtc_driver);
|
|
+}
|
|
+module_exit(jz4740_rtc_exit);
|
|
+
|
|
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
|
|
+MODULE_LICENSE("GPL");
|
|
+MODULE_DESCRIPTION("RTC driver for the JZ4740 SoC\n");
|
|
+MODULE_ALIAS("platform:jz4740-rtc");
|