| /* |
| * Faraday Technology FTRTC010 driver |
| * |
| * Copyright (C) 2009 Janos Laube <janos.dev@gmail.com> |
| * |
| * 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. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * Original code for older kernel 2.6.15 are from Stormlinksemi |
| * first update from Janos Laube for > 2.6.29 kernels |
| * |
| * checkpatch fixes and usage of rtc-lib code |
| * Hans Ulli Kroll <ulli.kroll@googlemail.com> |
| */ |
| |
| #include <linux/rtc.h> |
| #include <linux/io.h> |
| #include <linux/slab.h> |
| #include <linux/platform_device.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/mod_devicetable.h> |
| #include <linux/clk.h> |
| |
| #define DRV_NAME "rtc-ftrtc010" |
| |
| MODULE_AUTHOR("Hans Ulli Kroll <ulli.kroll@googlemail.com>"); |
| MODULE_DESCRIPTION("RTC driver for Gemini SoC"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:" DRV_NAME); |
| |
| struct ftrtc010_rtc { |
| struct rtc_device *rtc_dev; |
| void __iomem *rtc_base; |
| int rtc_irq; |
| struct clk *pclk; |
| struct clk *extclk; |
| }; |
| |
| enum ftrtc010_rtc_offsets { |
| FTRTC010_RTC_SECOND = 0x00, |
| FTRTC010_RTC_MINUTE = 0x04, |
| FTRTC010_RTC_HOUR = 0x08, |
| FTRTC010_RTC_DAYS = 0x0C, |
| FTRTC010_RTC_ALARM_SECOND = 0x10, |
| FTRTC010_RTC_ALARM_MINUTE = 0x14, |
| FTRTC010_RTC_ALARM_HOUR = 0x18, |
| FTRTC010_RTC_RECORD = 0x1C, |
| FTRTC010_RTC_CR = 0x20, |
| }; |
| |
| static irqreturn_t ftrtc010_rtc_interrupt(int irq, void *dev) |
| { |
| return IRQ_HANDLED; |
| } |
| |
| /* |
| * Looks like the RTC in the Gemini SoC is (totaly) broken |
| * We can't read/write directly the time from RTC registers. |
| * We must do some "offset" calculation to get the real time |
| * |
| * This FIX works pretty fine and Stormlinksemi aka Cortina-Networks does |
| * the same thing, without the rtc-lib.c calls. |
| */ |
| |
| static int ftrtc010_rtc_read_time(struct device *dev, struct rtc_time *tm) |
| { |
| struct ftrtc010_rtc *rtc = dev_get_drvdata(dev); |
| |
| u32 days, hour, min, sec, offset; |
| timeu64_t time; |
| |
| sec = readl(rtc->rtc_base + FTRTC010_RTC_SECOND); |
| min = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE); |
| hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR); |
| days = readl(rtc->rtc_base + FTRTC010_RTC_DAYS); |
| offset = readl(rtc->rtc_base + FTRTC010_RTC_RECORD); |
| |
| time = offset + days * 86400 + hour * 3600 + min * 60 + sec; |
| |
| rtc_time64_to_tm(time, tm); |
| |
| return 0; |
| } |
| |
| static int ftrtc010_rtc_set_time(struct device *dev, struct rtc_time *tm) |
| { |
| struct ftrtc010_rtc *rtc = dev_get_drvdata(dev); |
| u32 sec, min, hour, day, offset; |
| timeu64_t time; |
| |
| time = rtc_tm_to_time64(tm); |
| |
| sec = readl(rtc->rtc_base + FTRTC010_RTC_SECOND); |
| min = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE); |
| hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR); |
| day = readl(rtc->rtc_base + FTRTC010_RTC_DAYS); |
| |
| offset = time - (day * 86400 + hour * 3600 + min * 60 + sec); |
| |
| writel(offset, rtc->rtc_base + FTRTC010_RTC_RECORD); |
| writel(0x01, rtc->rtc_base + FTRTC010_RTC_CR); |
| |
| return 0; |
| } |
| |
| static const struct rtc_class_ops ftrtc010_rtc_ops = { |
| .read_time = ftrtc010_rtc_read_time, |
| .set_time = ftrtc010_rtc_set_time, |
| }; |
| |
| static int ftrtc010_rtc_probe(struct platform_device *pdev) |
| { |
| u32 days, hour, min, sec; |
| struct ftrtc010_rtc *rtc; |
| struct device *dev = &pdev->dev; |
| struct resource *res; |
| int ret; |
| |
| rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); |
| if (unlikely(!rtc)) |
| return -ENOMEM; |
| platform_set_drvdata(pdev, rtc); |
| |
| rtc->pclk = devm_clk_get(dev, "PCLK"); |
| if (IS_ERR(rtc->pclk)) { |
| dev_err(dev, "could not get PCLK\n"); |
| } else { |
| ret = clk_prepare_enable(rtc->pclk); |
| if (ret) { |
| dev_err(dev, "failed to enable PCLK\n"); |
| return ret; |
| } |
| } |
| rtc->extclk = devm_clk_get(dev, "EXTCLK"); |
| if (IS_ERR(rtc->extclk)) { |
| dev_err(dev, "could not get EXTCLK\n"); |
| } else { |
| ret = clk_prepare_enable(rtc->extclk); |
| if (ret) { |
| dev_err(dev, "failed to enable EXTCLK\n"); |
| return ret; |
| } |
| } |
| |
| res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| if (!res) |
| return -ENODEV; |
| |
| rtc->rtc_irq = res->start; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!res) |
| return -ENODEV; |
| |
| rtc->rtc_base = devm_ioremap(dev, res->start, |
| resource_size(res)); |
| if (!rtc->rtc_base) |
| return -ENOMEM; |
| |
| rtc->rtc_dev = devm_rtc_allocate_device(dev); |
| if (IS_ERR(rtc->rtc_dev)) |
| return PTR_ERR(rtc->rtc_dev); |
| |
| rtc->rtc_dev->ops = &ftrtc010_rtc_ops; |
| |
| sec = readl(rtc->rtc_base + FTRTC010_RTC_SECOND); |
| min = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE); |
| hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR); |
| days = readl(rtc->rtc_base + FTRTC010_RTC_DAYS); |
| |
| rtc->rtc_dev->range_min = (u64)days * 86400 + hour * 3600 + |
| min * 60 + sec; |
| rtc->rtc_dev->range_max = U32_MAX + rtc->rtc_dev->range_min; |
| |
| ret = devm_request_irq(dev, rtc->rtc_irq, ftrtc010_rtc_interrupt, |
| IRQF_SHARED, pdev->name, dev); |
| if (unlikely(ret)) |
| return ret; |
| |
| return rtc_register_device(rtc->rtc_dev); |
| } |
| |
| static int ftrtc010_rtc_remove(struct platform_device *pdev) |
| { |
| struct ftrtc010_rtc *rtc = platform_get_drvdata(pdev); |
| |
| if (!IS_ERR(rtc->extclk)) |
| clk_disable_unprepare(rtc->extclk); |
| if (!IS_ERR(rtc->pclk)) |
| clk_disable_unprepare(rtc->pclk); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id ftrtc010_rtc_dt_match[] = { |
| { .compatible = "cortina,gemini-rtc" }, |
| { .compatible = "faraday,ftrtc010" }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(of, ftrtc010_rtc_dt_match); |
| |
| static struct platform_driver ftrtc010_rtc_driver = { |
| .driver = { |
| .name = DRV_NAME, |
| .of_match_table = ftrtc010_rtc_dt_match, |
| }, |
| .probe = ftrtc010_rtc_probe, |
| .remove = ftrtc010_rtc_remove, |
| }; |
| |
| module_platform_driver_probe(ftrtc010_rtc_driver, ftrtc010_rtc_probe); |