cregit-Linux how code gets into the kernel

Release 4.14 drivers/rtc/rtc-ftrtc010.c

Directory: drivers/rtc
/*
 *  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/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; }

Contributors

PersonTokensPropCommitsCommitProp
Hans Ulli Kroll1593.75%150.00%
Linus Walleij16.25%150.00%
Total16100.00%2100.00%

/* * 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); unsigned int days, hour, min, sec; unsigned long offset, 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_time_to_tm(time, tm); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Hans Ulli Kroll11894.40%150.00%
Linus Walleij75.60%150.00%
Total125100.00%2100.00%


static int ftrtc010_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct ftrtc010_rtc *rtc = dev_get_drvdata(dev); unsigned int sec, min, hour, day; unsigned long offset, time; if (tm->tm_year >= 2148) /* EPOCH Year + 179 */ return -EINVAL; rtc_tm_to_time(tm, &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); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Hans Ulli Kroll14494.74%150.00%
Linus Walleij85.26%150.00%
Total152100.00%2100.00%

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) { 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; ret = devm_request_irq(dev, rtc->rtc_irq, ftrtc010_rtc_interrupt, IRQF_SHARED, pdev->name, dev); if (unlikely(ret)) return ret; rtc->rtc_dev = rtc_device_register(pdev->name, dev, &ftrtc010_rtc_ops, THIS_MODULE); return PTR_ERR_OR_ZERO(rtc->rtc_dev); }

Contributors

PersonTokensPropCommitsCommitProp
Hans Ulli Kroll18658.31%116.67%
Linus Walleij11836.99%233.33%
Pan Bian113.45%116.67%
Fengguang Wu41.25%233.33%
Total319100.00%6100.00%


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); rtc_device_unregister(rtc->rtc_dev); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Walleij3655.38%266.67%
Hans Ulli Kroll2944.62%133.33%
Total65100.00%3100.00%

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);

Overall Contributors

PersonTokensPropCommitsCommitProp
Hans Ulli Kroll62470.75%112.50%
Linus Walleij24227.44%337.50%
Pan Bian111.25%112.50%
Fengguang Wu40.45%225.00%
Julia Lawall10.11%112.50%
Total882100.00%8100.00%
Directory: drivers/rtc
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.