Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753668AbbELQ5R (ORCPT ); Tue, 12 May 2015 12:57:17 -0400 Received: from mail-wi0-f182.google.com ([209.85.212.182]:34949 "EHLO mail-wi0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753339AbbELQ5H (ORCPT ); Tue, 12 May 2015 12:57:07 -0400 From: Hans Ulli Kroll To: Alexandre Belloni Cc: linux-kernel@vger.kernel.org, Paul Bolle , Hans Ulli Kroll Subject: [PATCH 1/1] RTC:driver for Cortina's SOC Date: Tue, 12 May 2015 18:53:00 +0200 Message-Id: <1431449580-18975-2-git-send-email-ulli.kroll@googlemail.com> X-Mailer: git-send-email 2.4.0 In-Reply-To: <1431449580-18975-1-git-send-email-ulli.kroll@googlemail.com> References: <1431449580-18975-1-git-send-email-ulli.kroll@googlemail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7580 Lines: 265 Driver for the on chip RTC found on Cortina's SoC Gemini. Signed-off-by: Hans Ulli Kroll --- MAINTAINERS | 3 +- drivers/rtc/Kconfig | 10 +++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-gemini.c | 191 +++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 204 insertions(+), 1 deletion(-) create mode 100644 drivers/rtc/rtc-gemini.c diff --git a/MAINTAINERS b/MAINTAINERS index 1622775..2e91f68 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -975,9 +975,10 @@ S: Maintained ARM/CORTINA SYSTEMS GEMINI ARM ARCHITECTURE M: Hans Ulli Kroll L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers) -T: git git://git.berlios.de/gemini-board +T: git git://github.com/ulli-kroll/linux.git S: Maintained F: arch/arm/mach-gemini/ +F: drivers/rtc/rtc-gemini.c ARM/CSR SIRFPRIMA2 MACHINE SUPPORT M: Barry Song diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 6149ae0..99cbce0 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1362,6 +1362,16 @@ config RTC_DRV_ARMADA38X This driver can also be built as a module. If so, the module will be called armada38x-rtc. +config RTC_DRV_GEMINI + tristate "Gemini SoC RTC" + depends on ARCH_GEMINI + help + If you say Y here you will get support for the + RTC found on Gemini SoC's. + + This driver can also be built as a module. If so, the module + will be called rtc-gemini. + config RTC_DRV_PS3 tristate "PS3 RTC" depends on PPC_PS3 diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index c31731c..0fd6e22 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -64,6 +64,7 @@ obj-$(CONFIG_RTC_DRV_EFI) += rtc-efi.o obj-$(CONFIG_RTC_DRV_EM3027) += rtc-em3027.o obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o obj-$(CONFIG_RTC_DRV_FM3130) += rtc-fm3130.o +obj-$(CONFIG_RTC_DRV_GEMINI) += rtc-gemini.o obj-$(CONFIG_RTC_DRV_GENERIC) += rtc-generic.o obj-$(CONFIG_RTC_DRV_HID_SENSOR_TIME) += rtc-hid-sensor-time.o obj-$(CONFIG_RTC_DRV_HYM8563) += rtc-hym8563.o diff --git a/drivers/rtc/rtc-gemini.c b/drivers/rtc/rtc-gemini.c new file mode 100644 index 0000000..d5763ad --- /dev/null +++ b/drivers/rtc/rtc-gemini.c @@ -0,0 +1,191 @@ +/* + * Gemini OnChip RTC + * + * Copyright (C) 2009 Janos Laube + * + * 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 form Stormlinksemi + * first update from Janos Laube for > 2.6.29 kernels + * + * checkpatch fixes and usage off rtc-lib code + * Hans Ulli Kroll + */ + +#include +#include +#include +#include +#include +#include +#include + +#define DRV_NAME "rtc-gemini" +#define DRV_VERSION "0.2" + +MODULE_AUTHOR("Hans Ulli Kroll "); +MODULE_DESCRIPTION("RTC driver for Gemini SoC"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRV_NAME); + +struct gemini_rtc { + struct rtc_device *rtc_dev; + void __iomem *rtc_base; + int rtc_irq; +}; + +enum gemini_rtc_offsets { + GEMINI_RTC_SECOND = 0x00, + GEMINI_RTC_MINUTE = 0x04, + GEMINI_RTC_HOUR = 0x08, + GEMINI_RTC_DAYS = 0x0C, + GEMINI_RTC_ALARM_SECOND = 0x10, + GEMINI_RTC_ALARM_MINUTE = 0x14, + GEMINI_RTC_ALARM_HOUR = 0x18, + GEMINI_RTC_RECORD = 0x1C, + GEMINI_RTC_CR = 0x20 +}; + +static irqreturn_t gemini_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 gemini_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct gemini_rtc *rtc = dev_get_drvdata(dev); + + unsigned int days, hour, min, sec; + unsigned long offset, time; + + sec = readl(rtc->rtc_base + GEMINI_RTC_SECOND); + min = readl(rtc->rtc_base + GEMINI_RTC_MINUTE); + hour = readl(rtc->rtc_base + GEMINI_RTC_HOUR); + days = readl(rtc->rtc_base + GEMINI_RTC_DAYS); + offset = readl(rtc->rtc_base + GEMINI_RTC_RECORD); + + time = offset + days * 86400 + hour * 3600 + min * 60 + sec; + + rtc_time_to_tm(time, tm); + + return 0; +} + +static int gemini_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct gemini_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 + GEMINI_RTC_SECOND); + min = readl(rtc->rtc_base + GEMINI_RTC_MINUTE); + hour = readl(rtc->rtc_base + GEMINI_RTC_HOUR); + day = readl(rtc->rtc_base + GEMINI_RTC_DAYS); + + offset = time - (day * 86400 + hour * 3600 + min * 60 + sec); + + writel(offset, rtc->rtc_base + GEMINI_RTC_RECORD); + writel(0x01, rtc->rtc_base + GEMINI_RTC_CR); + + return 0; +} + +static struct rtc_class_ops gemini_rtc_ops = { + .read_time = gemini_rtc_read_time, + .set_time = gemini_rtc_set_time, +}; + +static int gemini_rtc_probe(struct platform_device *pdev) +{ + struct gemini_rtc *rtc; + struct device *dev = &pdev->dev; + struct resource *res; + int ret; + + rtc = kzalloc(sizeof(*rtc), GFP_KERNEL); + if (unlikely(!rtc)) + return -ENOMEM; + platform_set_drvdata(pdev, rtc); + + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (!res) { + ret = -ENODEV; + goto err_mem; + } + rtc->rtc_irq = res->start; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + ret = -ENODEV; + goto err_mem; + } + rtc->rtc_base = devm_ioremap(&pdev->dev, res->start, + res->end - res->start + 1); + + ret = request_irq(rtc->rtc_irq, gemini_rtc_interrupt, + IRQF_SHARED, pdev->name, dev); + if (unlikely(ret)) + goto err_mem; + + rtc->rtc_dev = rtc_device_register(pdev->name, dev, + &gemini_rtc_ops, THIS_MODULE); + if (unlikely(IS_ERR(rtc->rtc_dev))) { + ret = PTR_ERR(rtc->rtc_dev); + goto err_irq; + } + return 0; + +err_irq: + free_irq(rtc->rtc_irq, dev); + +err_mem: + kfree(rtc); + return ret; +} + +static int gemini_rtc_remove(struct platform_device *pdev) +{ + struct gemini_rtc *rtc = platform_get_drvdata(pdev); + struct device *dev = &pdev->dev; + + free_irq(rtc->rtc_irq, dev); + rtc_device_unregister(rtc->rtc_dev); + platform_set_drvdata(pdev, NULL); + kfree(rtc); + + return 0; +} + +static struct platform_driver gemini_rtc_driver = { + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + }, + .probe = gemini_rtc_probe, + .remove = gemini_rtc_remove, +}; + +module_platform_driver_probe(gemini_rtc_driver, gemini_rtc_probe); + -- 2.4.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/