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![Julia Lawall](/assets/img/avatar_default.png)
Check for rtc_class_ops structures that are only passed to devm_rtc_device_register, rtc_device_register, platform_device_register_data, all of which declare the corresponding parameter as const. Declare rtc_class_ops structures that have these properties as const. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @r disable optional_qualifier@ identifier i; position p; @@ static struct rtc_class_ops i@p = { ... }; @ok@ identifier r.i; expression e1,e2,e3,e4; position p; @@ ( devm_rtc_device_register(e1,e2,&i@p,e3) | rtc_device_register(e1,e2,&i@p,e3) | platform_device_register_data(e1,e2,e3,&i@p,e4) ) @bad@ position p != {r.p,ok.p}; identifier r.i; @@ i@p @depends on !bad disable optional_qualifier@ identifier r.i; @@ static +const struct rtc_class_ops i = { ... }; // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Acked-by: Baruch Siach <baruch@tkos.co.il> Acked-by: Hans Ulli Kroll <ulli.kroll@googlemail.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
170 lines
4.4 KiB
C
170 lines
4.4 KiB
C
/*
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* Gemini OnChip RTC
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*
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* Copyright (C) 2009 Janos Laube <janos.dev@gmail.com>
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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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* 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 <ulli.kroll@googlemail.com>
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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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#define DRV_NAME "rtc-gemini"
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MODULE_AUTHOR("Hans Ulli Kroll <ulli.kroll@googlemail.com>");
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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 gemini_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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};
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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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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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* 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 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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unsigned int days, hour, min, sec;
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unsigned long offset, time;
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sec = readl(rtc->rtc_base + GEMINI_RTC_SECOND);
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min = readl(rtc->rtc_base + GEMINI_RTC_MINUTE);
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hour = readl(rtc->rtc_base + GEMINI_RTC_HOUR);
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days = readl(rtc->rtc_base + GEMINI_RTC_DAYS);
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offset = readl(rtc->rtc_base + GEMINI_RTC_RECORD);
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time = offset + days * 86400 + hour * 3600 + min * 60 + sec;
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rtc_time_to_tm(time, tm);
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return 0;
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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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if (tm->tm_year >= 2148) /* EPOCH Year + 179 */
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return -EINVAL;
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rtc_tm_to_time(tm, &time);
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sec = readl(rtc->rtc_base + GEMINI_RTC_SECOND);
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min = readl(rtc->rtc_base + GEMINI_RTC_MINUTE);
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hour = readl(rtc->rtc_base + GEMINI_RTC_HOUR);
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day = readl(rtc->rtc_base + GEMINI_RTC_DAYS);
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offset = time - (day * 86400 + hour * 3600 + min * 60 + sec);
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writel(offset, rtc->rtc_base + GEMINI_RTC_RECORD);
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writel(0x01, rtc->rtc_base + GEMINI_RTC_CR);
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return 0;
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}
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static const 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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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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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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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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ret = devm_request_irq(dev, rtc->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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return ret;
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rtc->rtc_dev = rtc_device_register(pdev->name, dev,
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&gemini_rtc_ops, THIS_MODULE);
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return PTR_ERR_OR_ZERO(rtc->rtc_dev);
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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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rtc_device_unregister(rtc->rtc_dev);
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return 0;
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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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},
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.probe = gemini_rtc_probe,
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.remove = gemini_rtc_remove,
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};
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module_platform_driver_probe(gemini_rtc_driver, gemini_rtc_probe);
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