diff options
Diffstat (limited to 'target/linux/xburst/files-2.6.32/drivers/rtc/rtc-jz4740.c')
-rw-r--r-- | target/linux/xburst/files-2.6.32/drivers/rtc/rtc-jz4740.c | 333 |
1 files changed, 0 insertions, 333 deletions
diff --git a/target/linux/xburst/files-2.6.32/drivers/rtc/rtc-jz4740.c b/target/linux/xburst/files-2.6.32/drivers/rtc/rtc-jz4740.c deleted file mode 100644 index 03479a73f..000000000 --- a/target/linux/xburst/files-2.6.32/drivers/rtc/rtc-jz4740.c +++ /dev/null @@ -1,333 +0,0 @@ -/* - * Copyright (C) 2009, Lars-Peter Clausen <lars@metafoo.de> - * JZ4720/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/spinlock.h> -#include <linux/rtc.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_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 inline void jz4740_rtc_wait_write_ready(struct jz4740_rtc *rtc) -{ - uint32_t ctrl; - do { - ctrl = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_CTRL); - } while (!(ctrl & JZ_RTC_CTRL_WRDY)); -} - - -static inline void jz4740_rtc_reg_write(struct jz4740_rtc *rtc, size_t reg, - uint32_t val) -{ - jz4740_rtc_wait_write_ready(rtc); - writel(val, rtc->base + reg); -} - -static void jz4740_rtc_ctrl_set_bits(struct jz4740_rtc *rtc, uint32_t mask, - uint32_t val) -{ - 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; - - ctrl &= ~mask; - ctrl |= val; - - jz4740_rtc_reg_write(rtc, JZ_REG_RTC_CTRL, ctrl); - - spin_unlock_irqrestore(&rtc->lock, flags); -} - -static inline struct jz4740_rtc *dev_to_rtc(struct device *dev) -{ - return dev_get_drvdata(dev); -} - -static int jz4740_rtc_read_time(struct device *dev, struct rtc_time *time) -{ - struct jz4740_rtc *rtc = dev_to_rtc(dev); - uint32_t secs, secs2; - - secs = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_SEC); - secs2 = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_SEC); - - while (secs != secs2) { - secs = secs2; - secs2 = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_SEC); - } - - 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_to_rtc(dev); - - if ((uint32_t)secs != secs) - return -EINVAL; - - jz4740_rtc_reg_write(rtc, JZ_REG_RTC_SEC, secs); - - return 0; -} - -static int jz4740_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) -{ - struct jz4740_rtc *rtc = dev_to_rtc(dev); - uint32_t secs, secs2; - uint32_t ctrl; - - secs = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_SEC_ALARM); - secs2 = jz4740_rtc_reg_read(rtc, JZ_REG_RTC_SEC_ALARM); - - while (secs != secs2){ - secs = secs2; - secs2 = 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) -{ - struct jz4740_rtc *rtc = dev_to_rtc(dev); - unsigned long secs; - - rtc_tm_to_time(&alrm->time, &secs); - - if ((uint32_t)secs != secs) - return -EINVAL; - - jz4740_rtc_reg_write(rtc, JZ_REG_RTC_SEC_ALARM, (uint32_t)secs); - jz4740_rtc_ctrl_set_bits(rtc, JZ_RTC_CTRL_AE, - alrm->enabled ? JZ_RTC_CTRL_AE : 0); - - return 0; -} - -static int jz4740_rtc_update_irq_enable(struct device *dev, unsigned int enabled) -{ - struct jz4740_rtc *rtc = dev_to_rtc(dev); - jz4740_rtc_ctrl_set_bits(rtc, JZ_RTC_CTRL_1HZ_IRQ, - enabled ? JZ_RTC_CTRL_1HZ_IRQ : 0); - return 0; -} - - -static int jz4740_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) -{ - struct jz4740_rtc *rtc = dev_to_rtc(dev); - jz4740_rtc_ctrl_set_bits(rtc, JZ_RTC_CTRL_AF_IRQ, - enabled ? JZ_RTC_CTRL_AF_IRQ : 0); - return 0; -} - -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, 0); - - return IRQ_HANDLED; -} - -static int __devinit jz4740_rtc_probe(struct platform_device *pdev) -{ - int ret; - struct jz4740_rtc *rtc; - uint32_t scratchpad; - - rtc = kmalloc(sizeof(*rtc), GFP_KERNEL); - - 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; - } - - 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) { - jz4740_rtc_reg_write(rtc, JZ_REG_RTC_SCRATCHPAD, 0x12345678); - jz4740_rtc_reg_write(rtc, JZ_REG_RTC_SEC, 0); - } - - return 0; - -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 JZ4720/JZ4740 SoC\n"); -MODULE_ALIAS("platform:jz4740-rtc"); |