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+/*
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+ * Gemini OnChip RTC
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+ *
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+ * Copyright (C) 2009 Janos Laube <[email protected]>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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+ *
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+ * Original code for older kernel 2.6.15 are form Stormlinksemi
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+ * first update from Janos Laube for > 2.6.29 kernels
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+ *
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+ * checkpatch fixes and usage off rtc-lib code
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+ * Hans Ulli Kroll <[email protected]>
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+ */
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+
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+#include <linux/rtc.h>
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+#include <linux/io.h>
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+#include <linux/slab.h>
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+#include <linux/platform_device.h>
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+
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+#include <mach/hardware.h>
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+
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+#define DRV_NAME "rtc-gemini"
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+
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+MODULE_DESCRIPTION("RTC driver for Gemini SoC");
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+MODULE_ALIAS("platform:" DRV_NAME);
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+MODULE_AUTHOR("Hans Ulli Kroll <[email protected]>");
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+MODULE_LICENSE("GPL");
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+
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+struct gemini_rtc {
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+ struct rtc_device *dev;
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+ void __iomem *base;
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+ int irq;
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+};
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+
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+enum gemini_rtc_offsets {
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+ GEMINI_RTC_SECOND = 0x00,
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+ GEMINI_RTC_MINUTE = 0x04,
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+ GEMINI_RTC_HOUR = 0x08,
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+ GEMINI_RTC_DAYS = 0x0C,
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+ GEMINI_RTC_ALARM_SECOND = 0x10,
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+ GEMINI_RTC_ALARM_MINUTE = 0x14,
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+ GEMINI_RTC_ALARM_HOUR = 0x18,
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+ GEMINI_RTC_RECORD = 0x1C,
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+ GEMINI_RTC_CR = 0x20
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+};
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+
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+static irqreturn_t gemini_rtc_interrupt(int irq, void *dev)
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+{
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+ return IRQ_HANDLED;
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+}
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+
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+/*
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+ * Looks like the RTC in the Gemini SoC is (totaly) broken
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+ * We can't read/write directly the time from RTC registers.
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+ * We must do some "offset" calculation to get the real time
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+ *
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+ * The register "day" seams to be fixed, and the register "hour"
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+ * has his own mind.
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+ *
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+ * Maybe we can write directly the hour and days since EPOCH
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+ * but in this case the RTC will recalucate to some (other) strange values.
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+ * If you write time to the registers you will not read the same values.
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+ *
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+ * This FIX works pretty fine and Stormlinksemi aka Cortina-Networks does
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+ * the same thing, without the rtc-lib.c calls.
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+ */
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+
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+static int gemini_rtc_read_time(struct device *dev, struct rtc_time *tm)
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+{
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+ struct gemini_rtc *rtc = dev_get_drvdata(dev);
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+
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+ unsigned int days, hour, min, sec;
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+ unsigned long offset, time;
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+
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+ sec = readl(rtc->base + GEMINI_RTC_SECOND);
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+ min = readl(rtc->base + GEMINI_RTC_MINUTE);
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+ hour = readl(rtc->base + GEMINI_RTC_HOUR);
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+ days = readl(rtc->base + GEMINI_RTC_DAYS);
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+ offset = readl(rtc->base + GEMINI_RTC_RECORD);
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+
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+ time = offset + days * 86400 + hour * 3600 + min * 60 + sec;
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+
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+ rtc_time_to_tm(time, tm);
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+ return 0;
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+}
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+
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+/*
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+ * Maybe there is some hidden register to care ?
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+ * looks like register GEMINI_RTC_DAY can count
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+ * 365 days * 179 years >= 65535 (uint16)
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+ */
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+
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+static int gemini_rtc_set_time(struct device *dev, struct rtc_time *tm)
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+{
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+ struct gemini_rtc *rtc = dev_get_drvdata(dev);
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+ unsigned int sec, min, hour, day;
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+ unsigned long offset, time;
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+
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+ if (tm->tm_year >= 2148) /* EPOCH Year + 179 */
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+ return -EINVAL;
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+
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+ rtc_tm_to_time(tm , &time);
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+
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+ sec = readl(rtc->base + GEMINI_RTC_SECOND);
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+ min = readl(rtc->base + GEMINI_RTC_MINUTE);
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+ hour = readl(rtc->base + GEMINI_RTC_HOUR);
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+ day = readl(rtc->base + GEMINI_RTC_DAYS);
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+
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+ offset = time - (day*86400 + hour*3600 + min*60 + sec);
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+
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+ writel(offset, rtc->base + GEMINI_RTC_RECORD);
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+ writel(0x01, rtc->base + GEMINI_RTC_CR);
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+ return 0;
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+}
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+
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+static struct rtc_class_ops gemini_rtc_ops = {
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+ .read_time = gemini_rtc_read_time,
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+ .set_time = gemini_rtc_set_time,
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+};
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+
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+static int gemini_rtc_probe(struct platform_device *pdev)
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+{
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+ struct gemini_rtc *rtc;
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+ struct device *dev = &pdev->dev;
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+ struct resource *res;
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+ int ret;
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+
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+ rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
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+ if (unlikely(!rtc))
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+ return -ENOMEM;
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+ platform_set_drvdata(pdev, rtc);
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+
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+ rtc->irq = platform_get_irq(pdev, 0);
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+ if (rtc->irq < 0) {
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+ ret = -rtc->irq;
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+ goto err_mem;
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+ }
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+
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ if (!res) {
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+ ret = -ENODEV;
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+ goto err_mem;
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+ }
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+ rtc->base = devm_ioremap(&pdev->dev, res->start,
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+ res->end - res->start + 1);
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+
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+ ret = request_irq(rtc->irq, gemini_rtc_interrupt,
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+ IRQF_SHARED, pdev->name, dev);
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+ if (unlikely(ret))
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+ goto err_mem;
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+
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+ rtc->dev = rtc_device_register(pdev->name, dev,
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+ &gemini_rtc_ops, THIS_MODULE);
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+ if (unlikely(IS_ERR(rtc->dev))) {
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+ ret = PTR_ERR(rtc->dev);
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+ goto err_irq;
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+ }
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+ return 0;
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+
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+err_irq:
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+ free_irq(rtc->irq, dev);
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+
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+err_mem:
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+ kfree(rtc);
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+ return ret;
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+}
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+
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+static int gemini_rtc_remove(struct platform_device *pdev)
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+{
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+ struct gemini_rtc *rtc = platform_get_drvdata(pdev);
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+ struct device *dev = &pdev->dev;
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+
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+ free_irq(rtc->irq, dev);
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+ rtc_device_unregister(rtc->dev);
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+ platform_set_drvdata(pdev, NULL);
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+ kfree(rtc);
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+
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+ return 0;
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+}
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+
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+static struct platform_driver gemini_rtc_driver = {
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+ .driver = {
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+ .name = DRV_NAME,
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+ .owner = THIS_MODULE,
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+ },
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+ .probe = gemini_rtc_probe,
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+ .remove = gemini_rtc_remove,
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+};
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+
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+static int __init gemini_rtc_init(void)
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+{
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+ int retval;
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+
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+ retval = platform_driver_register(&gemini_rtc_driver);
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+ if (retval == 0)
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+ pr_info(DRV_NAME ": registered successfully");
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+ return retval;
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+}
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+
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+static void __exit gemini_rtc_exit(void)
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+{
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+ platform_driver_unregister(&gemini_rtc_driver);
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+}
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+
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+module_init(gemini_rtc_init);
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+module_exit(gemini_rtc_exit);
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John Crispin