diff options
Diffstat (limited to 'arch/unicore32/kernel/rtc.c')
| -rw-r--r-- | arch/unicore32/kernel/rtc.c | 371 |
1 files changed, 0 insertions, 371 deletions
diff --git a/arch/unicore32/kernel/rtc.c b/arch/unicore32/kernel/rtc.c deleted file mode 100644 index 8cad70b3302..00000000000 --- a/arch/unicore32/kernel/rtc.c +++ /dev/null @@ -1,371 +0,0 @@ -/* - * linux/arch/unicore32/kernel/rtc.c - * - * Code specific to PKUnity SoC and UniCore ISA - * - * Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn> - * Copyright (C) 2001-2010 Guan Xuetao - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/module.h> -#include <linux/fs.h> -#include <linux/string.h> -#include <linux/init.h> -#include <linux/platform_device.h> -#include <linux/interrupt.h> -#include <linux/rtc.h> -#include <linux/bcd.h> -#include <linux/clk.h> -#include <linux/log2.h> -#include <linux/slab.h> -#include <linux/uaccess.h> -#include <linux/io.h> - -#include <asm/irq.h> -#include <mach/hardware.h> - -static struct resource *puv3_rtc_mem; - -static int puv3_rtc_alarmno = IRQ_RTCAlarm; -static int puv3_rtc_tickno = IRQ_RTC; - -static DEFINE_SPINLOCK(puv3_rtc_pie_lock); - -/* IRQ Handlers */ - -static irqreturn_t puv3_rtc_alarmirq(int irq, void *id) -{ - struct rtc_device *rdev = id; - - writel(readl(RTC_RTSR) | RTC_RTSR_AL, RTC_RTSR); - rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF); - return IRQ_HANDLED; -} - -static irqreturn_t puv3_rtc_tickirq(int irq, void *id) -{ - struct rtc_device *rdev = id; - - writel(readl(RTC_RTSR) | RTC_RTSR_HZ, RTC_RTSR); - rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF); - return IRQ_HANDLED; -} - -/* Update control registers */ -static void puv3_rtc_setaie(int to) -{ - unsigned int tmp; - - pr_debug("%s: aie=%d\n", __func__, to); - - tmp = readl(RTC_RTSR) & ~RTC_RTSR_ALE; - - if (to) - tmp |= RTC_RTSR_ALE; - - writel(tmp, RTC_RTSR); -} - -static int puv3_rtc_setpie(struct device *dev, int enabled) -{ - unsigned int tmp; - - pr_debug("%s: pie=%d\n", __func__, enabled); - - spin_lock_irq(&puv3_rtc_pie_lock); - tmp = readl(RTC_RTSR) & ~RTC_RTSR_HZE; - - if (enabled) - tmp |= RTC_RTSR_HZE; - - writel(tmp, RTC_RTSR); - spin_unlock_irq(&puv3_rtc_pie_lock); - - return 0; -} - -/* Time read/write */ - -static int puv3_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) -{ - rtc_time_to_tm(readl(RTC_RCNR), rtc_tm); - - pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n", - rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday, - rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec); - - return 0; -} - -static int puv3_rtc_settime(struct device *dev, struct rtc_time *tm) -{ - unsigned long rtc_count = 0; - - pr_debug("set time %02d.%02d.%02d %02d/%02d/%02d\n", - tm->tm_year, tm->tm_mon, tm->tm_mday, - tm->tm_hour, tm->tm_min, tm->tm_sec); - - rtc_tm_to_time(tm, &rtc_count); - writel(rtc_count, RTC_RCNR); - - return 0; -} - -static int puv3_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm) -{ - struct rtc_time *alm_tm = &alrm->time; - - rtc_time_to_tm(readl(RTC_RTAR), alm_tm); - - alrm->enabled = readl(RTC_RTSR) & RTC_RTSR_ALE; - - pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n", - alrm->enabled, - alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday, - alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec); - - return 0; -} - -static int puv3_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) -{ - struct rtc_time *tm = &alrm->time; - unsigned long rtcalarm_count = 0; - - pr_debug("puv3_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n", - alrm->enabled, - tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff, - tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec); - - rtc_tm_to_time(tm, &rtcalarm_count); - writel(rtcalarm_count, RTC_RTAR); - - puv3_rtc_setaie(alrm->enabled); - - if (alrm->enabled) - enable_irq_wake(puv3_rtc_alarmno); - else - disable_irq_wake(puv3_rtc_alarmno); - - return 0; -} - -static int puv3_rtc_proc(struct device *dev, struct seq_file *seq) -{ - seq_printf(seq, "periodic_IRQ\t: %s\n", - (readl(RTC_RTSR) & RTC_RTSR_HZE) ? "yes" : "no"); - return 0; -} - -static int puv3_rtc_open(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct rtc_device *rtc_dev = platform_get_drvdata(pdev); - int ret; - - ret = request_irq(puv3_rtc_alarmno, puv3_rtc_alarmirq, - IRQF_DISABLED, "pkunity-rtc alarm", rtc_dev); - - if (ret) { - dev_err(dev, "IRQ%d error %d\n", puv3_rtc_alarmno, ret); - return ret; - } - - ret = request_irq(puv3_rtc_tickno, puv3_rtc_tickirq, - IRQF_DISABLED, "pkunity-rtc tick", rtc_dev); - - if (ret) { - dev_err(dev, "IRQ%d error %d\n", puv3_rtc_tickno, ret); - goto tick_err; - } - - return ret; - - tick_err: - free_irq(puv3_rtc_alarmno, rtc_dev); - return ret; -} - -static void puv3_rtc_release(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct rtc_device *rtc_dev = platform_get_drvdata(pdev); - - /* do not clear AIE here, it may be needed for wake */ - - puv3_rtc_setpie(dev, 0); - free_irq(puv3_rtc_alarmno, rtc_dev); - free_irq(puv3_rtc_tickno, rtc_dev); -} - -static const struct rtc_class_ops puv3_rtcops = { - .open = puv3_rtc_open, - .release = puv3_rtc_release, - .read_time = puv3_rtc_gettime, - .set_time = puv3_rtc_settime, - .read_alarm = puv3_rtc_getalarm, - .set_alarm = puv3_rtc_setalarm, - .proc = puv3_rtc_proc, -}; - -static void puv3_rtc_enable(struct platform_device *pdev, int en) -{ - if (!en) { - writel(readl(RTC_RTSR) & ~RTC_RTSR_HZE, RTC_RTSR); - } else { - /* re-enable the device, and check it is ok */ - - if ((readl(RTC_RTSR) & RTC_RTSR_HZE) == 0) { - dev_info(&pdev->dev, "rtc disabled, re-enabling\n"); - writel(readl(RTC_RTSR) | RTC_RTSR_HZE, RTC_RTSR); - } - } -} - -static int puv3_rtc_remove(struct platform_device *dev) -{ - struct rtc_device *rtc = platform_get_drvdata(dev); - - platform_set_drvdata(dev, NULL); - rtc_device_unregister(rtc); - - puv3_rtc_setpie(&dev->dev, 0); - puv3_rtc_setaie(0); - - release_resource(puv3_rtc_mem); - kfree(puv3_rtc_mem); - - return 0; -} - -static int puv3_rtc_probe(struct platform_device *pdev) -{ - struct rtc_device *rtc; - struct resource *res; - int ret; - - pr_debug("%s: probe=%p\n", __func__, pdev); - - /* find the IRQs */ - - puv3_rtc_tickno = platform_get_irq(pdev, 1); - if (puv3_rtc_tickno < 0) { - dev_err(&pdev->dev, "no irq for rtc tick\n"); - return -ENOENT; - } - - puv3_rtc_alarmno = platform_get_irq(pdev, 0); - if (puv3_rtc_alarmno < 0) { - dev_err(&pdev->dev, "no irq for alarm\n"); - return -ENOENT; - } - - pr_debug("PKUnity_rtc: tick irq %d, alarm irq %d\n", - puv3_rtc_tickno, puv3_rtc_alarmno); - - /* get the memory region */ - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (res == NULL) { - dev_err(&pdev->dev, "failed to get memory region resource\n"); - return -ENOENT; - } - - puv3_rtc_mem = request_mem_region(res->start, - res->end-res->start+1, - pdev->name); - - if (puv3_rtc_mem == NULL) { - dev_err(&pdev->dev, "failed to reserve memory region\n"); - ret = -ENOENT; - goto err_nores; - } - - puv3_rtc_enable(pdev, 1); - - /* register RTC and exit */ - - rtc = rtc_device_register("pkunity", &pdev->dev, &puv3_rtcops, - THIS_MODULE); - - if (IS_ERR(rtc)) { - dev_err(&pdev->dev, "cannot attach rtc\n"); - ret = PTR_ERR(rtc); - goto err_nortc; - } - - /* platform setup code should have handled this; sigh */ - if (!device_can_wakeup(&pdev->dev)) - device_init_wakeup(&pdev->dev, 1); - - platform_set_drvdata(pdev, rtc); - return 0; - - err_nortc: - puv3_rtc_enable(pdev, 0); - release_resource(puv3_rtc_mem); - - err_nores: - return ret; -} - -#ifdef CONFIG_PM - -/* RTC Power management control */ - -static int ticnt_save; - -static int puv3_rtc_suspend(struct platform_device *pdev, pm_message_t state) -{ - /* save RTAR for anyone using periodic interrupts */ - ticnt_save = readl(RTC_RTAR); - puv3_rtc_enable(pdev, 0); - return 0; -} - -static int puv3_rtc_resume(struct platform_device *pdev) -{ - puv3_rtc_enable(pdev, 1); - writel(ticnt_save, RTC_RTAR); - return 0; -} -#else -#define puv3_rtc_suspend NULL -#define puv3_rtc_resume NULL -#endif - -static struct platform_driver puv3_rtcdrv = { - .probe = puv3_rtc_probe, - .remove = __devexit_p(puv3_rtc_remove), - .suspend = puv3_rtc_suspend, - .resume = puv3_rtc_resume, - .driver = { - .name = "PKUnity-v3-RTC", - .owner = THIS_MODULE, - } -}; - -static char __initdata banner[] = "PKUnity-v3 RTC, (c) 2009 PKUnity Co.\n"; - -static int __init puv3_rtc_init(void) -{ - printk(banner); - return platform_driver_register(&puv3_rtcdrv); -} - -static void __exit puv3_rtc_exit(void) -{ - platform_driver_unregister(&puv3_rtcdrv); -} - -module_init(puv3_rtc_init); -module_exit(puv3_rtc_exit); - -MODULE_DESCRIPTION("RTC Driver for the PKUnity v3 chip"); -MODULE_AUTHOR("Hu Dongliang"); -MODULE_LICENSE("GPL v2"); - |