mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Linus Walleij](/assets/img/avatar_default.png)
The Gemini RTC is actually a generic IP block from Faraday Technology names FTRTC010. Rename the driver file and all symbols to match this IP name. The relationship can be clearly seen in the U-Boot driver posted by Po-Yu Chuang for the Faraday A320 board: https://lists.denx.de/pipermail/u-boot/2009-September/061326.html Remove the dependency on ARCH_GEMINI but select the driver for ARCH_GEMINI so we get a smooth transition. The IP block is synthsized on different silicon and architectures. Cc: Po-Yu Chuang <ratbert@faraday-tech.com> Acked-by: Hans Ulli Kroll <ulli.kroll@googlemail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
208 lines
5.4 KiB
C
208 lines
5.4 KiB
C
/*
|
|
* 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;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|