diff options
Diffstat (limited to 'target/linux/gemini/files/drivers/rtc')
| -rw-r--r-- | target/linux/gemini/files/drivers/rtc/rtc-gemini.c | 220 |
1 files changed, 0 insertions, 220 deletions
diff --git a/target/linux/gemini/files/drivers/rtc/rtc-gemini.c b/target/linux/gemini/files/drivers/rtc/rtc-gemini.c deleted file mode 100644 index 587d812..0000000 --- a/target/linux/gemini/files/drivers/rtc/rtc-gemini.c +++ /dev/null @@ -1,220 +0,0 @@ -/* - * Gemini OnChip RTC - * - * 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. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - * - * 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 <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 <mach/hardware.h> - -#define DRV_NAME "rtc-gemini" - -MODULE_DESCRIPTION("RTC driver for Gemini SoC"); -MODULE_ALIAS("platform:" DRV_NAME); -MODULE_AUTHOR("Hans Ulli Kroll <ulli.kroll@googlemail.com>"); -MODULE_LICENSE("GPL"); - -struct gemini_rtc { - struct rtc_device *dev; - void __iomem *base; - int 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 - * - * The register "day" seams to be fixed, and the register "hour" - * has his own mind. - * - * Maybe we can write directly the hour and days since EPOCH - * but in this case the RTC will recalucate to some (other) strange values. - * If you write time to the registers you will not read the same values. - * - * 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->base + GEMINI_RTC_SECOND); - min = readl(rtc->base + GEMINI_RTC_MINUTE); - hour = readl(rtc->base + GEMINI_RTC_HOUR); - days = readl(rtc->base + GEMINI_RTC_DAYS); - offset = readl(rtc->base + GEMINI_RTC_RECORD); - - time = offset + days * 86400 + hour * 3600 + min * 60 + sec; - - rtc_time_to_tm(time, tm); - return 0; -} - -/* - * Maybe there is some hidden register to care ? - * looks like register GEMINI_RTC_DAY can count - * 365 days * 179 years >= 65535 (uint16) - */ - -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->base + GEMINI_RTC_SECOND); - min = readl(rtc->base + GEMINI_RTC_MINUTE); - hour = readl(rtc->base + GEMINI_RTC_HOUR); - day = readl(rtc->base + GEMINI_RTC_DAYS); - - offset = time - (day*86400 + hour*3600 + min*60 + sec); - - writel(offset, rtc->base + GEMINI_RTC_RECORD); - writel(0x01, 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); - - rtc->irq = platform_get_irq(pdev, 0); - if (rtc->irq < 0) { - ret = -rtc->irq; - goto err_mem; - } - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) { - ret = -ENODEV; - goto err_mem; - } - rtc->base = devm_ioremap(&pdev->dev, res->start, - res->end - res->start + 1); - - ret = request_irq(rtc->irq, gemini_rtc_interrupt, - IRQF_SHARED, pdev->name, dev); - if (unlikely(ret)) - goto err_mem; - - rtc->dev = rtc_device_register(pdev->name, dev, - &gemini_rtc_ops, THIS_MODULE); - if (unlikely(IS_ERR(rtc->dev))) { - ret = PTR_ERR(rtc->dev); - goto err_irq; - } - return 0; - -err_irq: - free_irq(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->irq, dev); - rtc_device_unregister(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, -}; - -static int __init gemini_rtc_init(void) -{ - int retval; - - retval = platform_driver_register(&gemini_rtc_driver); - if (retval == 0) - pr_info(DRV_NAME ": registered successfully"); - return retval; -} - -static void __exit gemini_rtc_exit(void) -{ - platform_driver_unregister(&gemini_rtc_driver); -} - -module_init(gemini_rtc_init); -module_exit(gemini_rtc_exit); |