--- /dev/null
+/*
+ * 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 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,
+ 0, "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,
+ 0, "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 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)
+{
+ struct rtc_device *rtc = platform_get_drvdata(dev);
+
+ rtc_device_unregister(rtc);
+
+ 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);
+
+ /* 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 = 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->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");
Code Review / kvmfornfv.git / blobdiff