diff options
Diffstat (limited to 'target/linux/xburst/patches-2.6.35/052-rtc.patch')
| -rw-r--r-- | target/linux/xburst/patches-2.6.35/052-rtc.patch | 400 |
1 files changed, 400 insertions, 0 deletions
diff --git a/target/linux/xburst/patches-2.6.35/052-rtc.patch b/target/linux/xburst/patches-2.6.35/052-rtc.patch new file mode 100644 index 0000000000..f04c7bd1a4 --- /dev/null +++ b/target/linux/xburst/patches-2.6.35/052-rtc.patch @@ -0,0 +1,400 @@ +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"); |