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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219// SPDX-License-Identifier: GPL-2.0-or-later/* * Faraday Technology FTRTC010 driver * * Copyright (C) 2009 Janos Laube <janos.dev@gmail.com> * * 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 { 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; struct rtc_device *rtc_dev; 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"); goto err_disable_pclk; } }
rtc->rtc_irq = platform_get_irq(pdev, 0); if (rtc->rtc_irq < 0) { ret = rtc->rtc_irq; goto err_disable_extclk; }
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { ret = -ENODEV; goto err_disable_extclk; }
rtc->rtc_base = devm_ioremap(dev, res->start, resource_size(res)); if (!rtc->rtc_base) { ret = -ENOMEM; goto err_disable_extclk; }
rtc_dev = devm_rtc_allocate_device(dev); if (IS_ERR(rtc_dev)) { ret = PTR_ERR(rtc_dev); goto err_disable_extclk; }
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_dev->range_min = (u64)days * 86400 + hour * 3600 + min * 60 + sec; rtc_dev->range_max = U32_MAX + rtc_dev->range_min;
ret = devm_request_irq(dev, rtc->rtc_irq, ftrtc010_rtc_interrupt, IRQF_SHARED, pdev->name, dev); if (unlikely(ret)) goto err_disable_extclk;
return devm_rtc_register_device(rtc_dev);
err_disable_extclk: clk_disable_unprepare(rtc->extclk);err_disable_pclk: clk_disable_unprepare(rtc->pclk); return ret;}
static void 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);}
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);