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210 lines
5.3 KiB
210 lines
5.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Faraday Technology FTRTC010 driver |
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* |
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* Copyright (C) 2009 Janos Laube <[email protected]> |
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* |
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* Original code for older kernel 2.6.15 are from 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 of rtc-lib code |
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* Hans Ulli Kroll <[email protected]> |
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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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#include <linux/mod_devicetable.h> |
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#include <linux/clk.h> |
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#define DRV_NAME "rtc-ftrtc010" |
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MODULE_AUTHOR("Hans Ulli Kroll <[email protected]>"); |
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MODULE_DESCRIPTION("RTC driver for Gemini SoC"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:" DRV_NAME); |
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struct ftrtc010_rtc { |
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struct rtc_device *rtc_dev; |
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void __iomem *rtc_base; |
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int rtc_irq; |
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struct clk *pclk; |
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struct clk *extclk; |
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}; |
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enum ftrtc010_rtc_offsets { |
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FTRTC010_RTC_SECOND = 0x00, |
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FTRTC010_RTC_MINUTE = 0x04, |
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FTRTC010_RTC_HOUR = 0x08, |
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FTRTC010_RTC_DAYS = 0x0C, |
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FTRTC010_RTC_ALARM_SECOND = 0x10, |
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FTRTC010_RTC_ALARM_MINUTE = 0x14, |
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FTRTC010_RTC_ALARM_HOUR = 0x18, |
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FTRTC010_RTC_RECORD = 0x1C, |
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FTRTC010_RTC_CR = 0x20, |
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}; |
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static irqreturn_t ftrtc010_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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* 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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* 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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static int ftrtc010_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct ftrtc010_rtc *rtc = dev_get_drvdata(dev); |
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u32 days, hour, min, sec, offset; |
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timeu64_t time; |
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sec = readl(rtc->rtc_base + FTRTC010_RTC_SECOND); |
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min = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE); |
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hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR); |
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days = readl(rtc->rtc_base + FTRTC010_RTC_DAYS); |
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offset = readl(rtc->rtc_base + FTRTC010_RTC_RECORD); |
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time = offset + days * 86400 + hour * 3600 + min * 60 + sec; |
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rtc_time64_to_tm(time, tm); |
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return 0; |
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} |
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static int ftrtc010_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct ftrtc010_rtc *rtc = dev_get_drvdata(dev); |
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u32 sec, min, hour, day, offset; |
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timeu64_t time; |
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time = rtc_tm_to_time64(tm); |
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sec = readl(rtc->rtc_base + FTRTC010_RTC_SECOND); |
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min = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE); |
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hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR); |
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day = readl(rtc->rtc_base + FTRTC010_RTC_DAYS); |
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offset = time - (day * 86400 + hour * 3600 + min * 60 + sec); |
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writel(offset, rtc->rtc_base + FTRTC010_RTC_RECORD); |
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writel(0x01, rtc->rtc_base + FTRTC010_RTC_CR); |
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return 0; |
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} |
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static const struct rtc_class_ops ftrtc010_rtc_ops = { |
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.read_time = ftrtc010_rtc_read_time, |
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.set_time = ftrtc010_rtc_set_time, |
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}; |
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static int ftrtc010_rtc_probe(struct platform_device *pdev) |
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{ |
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u32 days, hour, min, sec; |
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struct ftrtc010_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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rtc = devm_kzalloc(&pdev->dev, 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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rtc->pclk = devm_clk_get(dev, "PCLK"); |
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if (IS_ERR(rtc->pclk)) { |
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dev_err(dev, "could not get PCLK\n"); |
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} else { |
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ret = clk_prepare_enable(rtc->pclk); |
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if (ret) { |
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dev_err(dev, "failed to enable PCLK\n"); |
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return ret; |
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} |
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} |
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rtc->extclk = devm_clk_get(dev, "EXTCLK"); |
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if (IS_ERR(rtc->extclk)) { |
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dev_err(dev, "could not get EXTCLK\n"); |
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} else { |
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ret = clk_prepare_enable(rtc->extclk); |
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if (ret) { |
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dev_err(dev, "failed to enable EXTCLK\n"); |
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return ret; |
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} |
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} |
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res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
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if (!res) |
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return -ENODEV; |
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rtc->rtc_irq = res->start; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!res) |
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return -ENODEV; |
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rtc->rtc_base = devm_ioremap(dev, res->start, |
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resource_size(res)); |
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if (!rtc->rtc_base) |
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return -ENOMEM; |
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rtc->rtc_dev = devm_rtc_allocate_device(dev); |
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if (IS_ERR(rtc->rtc_dev)) |
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return PTR_ERR(rtc->rtc_dev); |
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rtc->rtc_dev->ops = &ftrtc010_rtc_ops; |
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sec = readl(rtc->rtc_base + FTRTC010_RTC_SECOND); |
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min = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE); |
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hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR); |
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days = readl(rtc->rtc_base + FTRTC010_RTC_DAYS); |
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rtc->rtc_dev->range_min = (u64)days * 86400 + hour * 3600 + |
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min * 60 + sec; |
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rtc->rtc_dev->range_max = U32_MAX + rtc->rtc_dev->range_min; |
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ret = devm_request_irq(dev, rtc->rtc_irq, ftrtc010_rtc_interrupt, |
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IRQF_SHARED, pdev->name, dev); |
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if (unlikely(ret)) |
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return ret; |
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return devm_rtc_register_device(rtc->rtc_dev); |
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} |
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static int ftrtc010_rtc_remove(struct platform_device *pdev) |
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{ |
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struct ftrtc010_rtc *rtc = platform_get_drvdata(pdev); |
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if (!IS_ERR(rtc->extclk)) |
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clk_disable_unprepare(rtc->extclk); |
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if (!IS_ERR(rtc->pclk)) |
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clk_disable_unprepare(rtc->pclk); |
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return 0; |
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} |
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static const struct of_device_id ftrtc010_rtc_dt_match[] = { |
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{ .compatible = "cortina,gemini-rtc" }, |
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{ .compatible = "faraday,ftrtc010" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, ftrtc010_rtc_dt_match); |
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static struct platform_driver ftrtc010_rtc_driver = { |
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.driver = { |
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.name = DRV_NAME, |
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.of_match_table = ftrtc010_rtc_dt_match, |
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}, |
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.probe = ftrtc010_rtc_probe, |
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.remove = ftrtc010_rtc_remove, |
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}; |
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module_platform_driver_probe(ftrtc010_rtc_driver, ftrtc010_rtc_probe);
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