litmus-rt.git - The LITMUS^RT kernel.

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author	Trond Myklebust <Trond.Myklebust@netapp.com>	2006-06-29 16:38:37 -0400
committer	Trond Myklebust <Trond.Myklebust@netapp.com>	2006-07-05 13:13:18 -0400
commit	f07f18dd6f29f11887b8d9cf7ecb736bf2f7dc62 (patch)
tree	069d7fbf4ad2e5a290c27965c7714b2b0e5e8f61 /arch/mips/mm/c-r3k.c
parent	42a2d13eee3c895d22e9d1a52b96d15ca49adabc (diff)

VFS: Add support for the FL_ACCESS flag to flock_lock_file()

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

Diffstat (limited to 'arch/mips/mm/c-r3k.c')

0 files changed, 0 insertions, 0 deletions

/* * 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");


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