| /* |
| * RTC driver 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(struct device *dev, int to) |
| { |
| unsigned int tmp; |
| |
| dev_dbg(dev, "%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; |
| |
| dev_dbg(dev, "%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); |
| |
| dev_dbg(dev, "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; |
| |
| dev_dbg(dev, "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; |
| |
| dev_dbg(dev, "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; |
| |
| dev_dbg(dev, "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(dev, 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 const struct rtc_class_ops puv3_rtcops = { |
| .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 device *dev, 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(dev, "rtc disabled, re-enabling\n"); |
| writel(readl(RTC_RTSR) | RTC_RTSR_HZE, RTC_RTSR); |
| } |
| } |
| } |
| |
| static int puv3_rtc_remove(struct platform_device *dev) |
| { |
| puv3_rtc_setpie(&dev->dev, 0); |
| puv3_rtc_setaie(&dev->dev, 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; |
| |
| dev_dbg(&pdev->dev, "%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; |
| } |
| |
| dev_dbg(&pdev->dev, "PKUnity_rtc: tick irq %d, alarm irq %d\n", |
| puv3_rtc_tickno, puv3_rtc_alarmno); |
| |
| rtc = devm_rtc_allocate_device(&pdev->dev); |
| if (IS_ERR(rtc)) |
| return PTR_ERR(rtc); |
| |
| ret = devm_request_irq(&pdev->dev, puv3_rtc_alarmno, puv3_rtc_alarmirq, |
| 0, "pkunity-rtc alarm", rtc); |
| if (ret) { |
| dev_err(&pdev->dev, "IRQ%d error %d\n", puv3_rtc_alarmno, ret); |
| return ret; |
| } |
| |
| ret = devm_request_irq(&pdev->dev, puv3_rtc_tickno, puv3_rtc_tickirq, |
| 0, "pkunity-rtc tick", rtc); |
| if (ret) { |
| dev_err(&pdev->dev, "IRQ%d error %d\n", puv3_rtc_tickno, ret); |
| return ret; |
| } |
| |
| /* 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, resource_size(res), |
| 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->dev, 1); |
| |
| /* register RTC and exit */ |
| rtc->ops = &puv3_rtcops; |
| ret = rtc_register_device(rtc); |
| if (ret) { |
| dev_err(&pdev->dev, "cannot attach rtc\n"); |
| 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->dev, 0); |
| release_resource(puv3_rtc_mem); |
| |
| err_nores: |
| return ret; |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int ticnt_save; |
| |
| static int puv3_rtc_suspend(struct device *dev) |
| { |
| /* save RTAR for anyone using periodic interrupts */ |
| ticnt_save = readl(RTC_RTAR); |
| puv3_rtc_enable(dev, 0); |
| return 0; |
| } |
| |
| static int puv3_rtc_resume(struct device *dev) |
| { |
| puv3_rtc_enable(dev, 1); |
| writel(ticnt_save, RTC_RTAR); |
| return 0; |
| } |
| #endif |
| |
| static SIMPLE_DEV_PM_OPS(puv3_rtc_pm_ops, puv3_rtc_suspend, puv3_rtc_resume); |
| |
| static struct platform_driver puv3_rtc_driver = { |
| .probe = puv3_rtc_probe, |
| .remove = puv3_rtc_remove, |
| .driver = { |
| .name = "PKUnity-v3-RTC", |
| .pm = &puv3_rtc_pm_ops, |
| } |
| }; |
| |
| module_platform_driver(puv3_rtc_driver); |
| |
| MODULE_DESCRIPTION("RTC Driver for the PKUnity v3 chip"); |
| MODULE_AUTHOR("Hu Dongliang"); |
| MODULE_LICENSE("GPL v2"); |