diff options
Diffstat (limited to 'drivers/rtc/rtc-mxc.c')
| -rw-r--r-- | drivers/rtc/rtc-mxc.c | 214 |
1 files changed, 56 insertions, 158 deletions
diff --git a/drivers/rtc/rtc-mxc.c b/drivers/rtc/rtc-mxc.c index 401f46d8f21b..608db97d450c 100644 --- a/drivers/rtc/rtc-mxc.c +++ b/drivers/rtc/rtc-mxc.c @@ -1,13 +1,6 @@ -/* - * Copyright 2004-2008 Freescale Semiconductor, Inc. All Rights Reserved. - * - * The code contained herein is licensed under the GNU General Public - * License. You may obtain a copy of the GNU General Public License - * Version 2 or later at the following locations: - * - * http://www.opensource.org/licenses/gpl-license.html - * http://www.gnu.org/copyleft/gpl.html - */ +// SPDX-License-Identifier: GPL-2.0+ +// +// Copyright 2004-2008 Freescale Semiconductor, Inc. All Rights Reserved. #include <linux/io.h> #include <linux/rtc.h> @@ -15,9 +8,9 @@ #include <linux/slab.h> #include <linux/interrupt.h> #include <linux/platform_device.h> +#include <linux/pm_wakeirq.h> #include <linux/clk.h> #include <linux/of.h> -#include <linux/of_device.h> #define RTC_INPUT_CLK_32768HZ (0x00 << 5) #define RTC_INPUT_CLK_32000HZ (0x01 << 5) @@ -76,27 +69,12 @@ struct rtc_plat_data { enum imx_rtc_type devtype; }; -static const struct platform_device_id imx_rtc_devtype[] = { - { - .name = "imx1-rtc", - .driver_data = IMX1_RTC, - }, { - .name = "imx21-rtc", - .driver_data = IMX21_RTC, - }, { - /* sentinel */ - } -}; -MODULE_DEVICE_TABLE(platform, imx_rtc_devtype); - -#ifdef CONFIG_OF static const struct of_device_id imx_rtc_dt_ids[] = { { .compatible = "fsl,imx1-rtc", .data = (const void *)IMX1_RTC }, { .compatible = "fsl,imx21-rtc", .data = (const void *)IMX21_RTC }, {} }; MODULE_DEVICE_TABLE(of, imx_rtc_dt_ids); -#endif static inline int is_imx1_rtc(struct rtc_plat_data *data) { @@ -109,8 +87,7 @@ static inline int is_imx1_rtc(struct rtc_plat_data *data) */ static time64_t get_alarm_or_time(struct device *dev, int time_alarm) { - struct platform_device *pdev = to_platform_device(dev); - struct rtc_plat_data *pdata = platform_get_drvdata(pdev); + struct rtc_plat_data *pdata = dev_get_drvdata(dev); void __iomem *ioaddr = pdata->ioaddr; u32 day = 0, hr = 0, min = 0, sec = 0, hr_min = 0; @@ -139,8 +116,7 @@ static time64_t get_alarm_or_time(struct device *dev, int time_alarm) static void set_alarm_or_time(struct device *dev, int time_alarm, time64_t time) { u32 tod, day, hr, min, sec, temp; - struct platform_device *pdev = to_platform_device(dev); - struct rtc_plat_data *pdata = platform_get_drvdata(pdev); + struct rtc_plat_data *pdata = dev_get_drvdata(dev); void __iomem *ioaddr = pdata->ioaddr; day = div_s64_rem(time, 86400, &tod); @@ -176,8 +152,7 @@ static void set_alarm_or_time(struct device *dev, int time_alarm, time64_t time) static void rtc_update_alarm(struct device *dev, struct rtc_time *alrm) { time64_t time; - struct platform_device *pdev = to_platform_device(dev); - struct rtc_plat_data *pdata = platform_get_drvdata(pdev); + struct rtc_plat_data *pdata = dev_get_drvdata(dev); void __iomem *ioaddr = pdata->ioaddr; time = rtc_tm_to_time64(alrm); @@ -190,12 +165,12 @@ static void rtc_update_alarm(struct device *dev, struct rtc_time *alrm) static void mxc_rtc_irq_enable(struct device *dev, unsigned int bit, unsigned int enabled) { - struct platform_device *pdev = to_platform_device(dev); - struct rtc_plat_data *pdata = platform_get_drvdata(pdev); + struct rtc_plat_data *pdata = dev_get_drvdata(dev); void __iomem *ioaddr = pdata->ioaddr; u32 reg; + unsigned long flags; - spin_lock_irq(&pdata->rtc->irq_lock); + spin_lock_irqsave(&pdata->rtc->irq_lock, flags); reg = readw(ioaddr + RTC_RTCIENR); if (enabled) @@ -204,7 +179,7 @@ static void mxc_rtc_irq_enable(struct device *dev, unsigned int bit, reg &= ~bit; writew(reg, ioaddr + RTC_RTCIENR); - spin_unlock_irq(&pdata->rtc->irq_lock); + spin_unlock_irqrestore(&pdata->rtc->irq_lock, flags); } /* This function is the RTC interrupt service routine. */ @@ -213,11 +188,10 @@ static irqreturn_t mxc_rtc_interrupt(int irq, void *dev_id) struct platform_device *pdev = dev_id; struct rtc_plat_data *pdata = platform_get_drvdata(pdev); void __iomem *ioaddr = pdata->ioaddr; - unsigned long flags; u32 status; u32 events = 0; - spin_lock_irqsave(&pdata->rtc->irq_lock, flags); + spin_lock(&pdata->rtc->irq_lock); status = readw(ioaddr + RTC_RTCISR) & readw(ioaddr + RTC_RTCIENR); /* clear interrupt sources */ writew(status, ioaddr + RTC_RTCISR); @@ -233,31 +207,11 @@ static irqreturn_t mxc_rtc_interrupt(int irq, void *dev_id) events |= (RTC_PF | RTC_IRQF); rtc_update_irq(pdata->rtc, 1, events); - spin_unlock_irqrestore(&pdata->rtc->irq_lock, flags); + spin_unlock(&pdata->rtc->irq_lock); return IRQ_HANDLED; } -/* - * Clear all interrupts and release the IRQ - */ -static void mxc_rtc_release(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct rtc_plat_data *pdata = platform_get_drvdata(pdev); - void __iomem *ioaddr = pdata->ioaddr; - - spin_lock_irq(&pdata->rtc->irq_lock); - - /* Disable all rtc interrupts */ - writew(0, ioaddr + RTC_RTCIENR); - - /* Clear all interrupt status */ - writew(0xffffffff, ioaddr + RTC_RTCISR); - - spin_unlock_irq(&pdata->rtc->irq_lock); -} - static int mxc_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) { mxc_rtc_irq_enable(dev, RTC_ALM_BIT, enabled); @@ -284,21 +238,9 @@ static int mxc_rtc_read_time(struct device *dev, struct rtc_time *tm) /* * This function sets the internal RTC time based on tm in Gregorian date. */ -static int mxc_rtc_set_mmss(struct device *dev, time64_t time) +static int mxc_rtc_set_time(struct device *dev, struct rtc_time *tm) { - struct platform_device *pdev = to_platform_device(dev); - struct rtc_plat_data *pdata = platform_get_drvdata(pdev); - - /* - * TTC_DAYR register is 9-bit in MX1 SoC, save time and day of year only - */ - if (is_imx1_rtc(pdata)) { - struct rtc_time tm; - - rtc_time64_to_tm(time, &tm); - tm.tm_year = 70; - time = rtc_tm_to_time64(&tm); - } + time64_t time = rtc_tm_to_time64(tm); /* Avoid roll-over from reading the different registers */ do { @@ -315,8 +257,7 @@ static int mxc_rtc_set_mmss(struct device *dev, time64_t time) */ static int mxc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) { - struct platform_device *pdev = to_platform_device(dev); - struct rtc_plat_data *pdata = platform_get_drvdata(pdev); + struct rtc_plat_data *pdata = dev_get_drvdata(dev); void __iomem *ioaddr = pdata->ioaddr; rtc_time64_to_tm(get_alarm_or_time(dev, MXC_RTC_ALARM), &alrm->time); @@ -330,8 +271,7 @@ static int mxc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) */ static int mxc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) { - struct platform_device *pdev = to_platform_device(dev); - struct rtc_plat_data *pdata = platform_get_drvdata(pdev); + struct rtc_plat_data *pdata = dev_get_drvdata(dev); rtc_update_alarm(dev, &alrm->time); @@ -343,9 +283,8 @@ static int mxc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) /* RTC layer */ static const struct rtc_class_ops mxc_rtc_ops = { - .release = mxc_rtc_release, .read_time = mxc_rtc_read_time, - .set_mmss64 = mxc_rtc_set_mmss, + .set_time = mxc_rtc_set_time, .read_alarm = mxc_rtc_read_alarm, .set_alarm = mxc_rtc_set_alarm, .alarm_irq_enable = mxc_rtc_alarm_irq_enable, @@ -353,50 +292,58 @@ static const struct rtc_class_ops mxc_rtc_ops = { static int mxc_rtc_probe(struct platform_device *pdev) { - struct resource *res; struct rtc_device *rtc; struct rtc_plat_data *pdata = NULL; u32 reg; unsigned long rate; int ret; - const struct of_device_id *of_id; pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; - of_id = of_match_device(imx_rtc_dt_ids, &pdev->dev); - if (of_id) - pdata->devtype = (enum imx_rtc_type)of_id->data; - else - pdata->devtype = pdev->id_entry->driver_data; + pdata->devtype = (uintptr_t)of_device_get_match_data(&pdev->dev); - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res); + pdata->ioaddr = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(pdata->ioaddr)) return PTR_ERR(pdata->ioaddr); - pdata->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); + rtc = devm_rtc_allocate_device(&pdev->dev); + if (IS_ERR(rtc)) + return PTR_ERR(rtc); + + pdata->rtc = rtc; + rtc->ops = &mxc_rtc_ops; + if (is_imx1_rtc(pdata)) { + struct rtc_time tm; + + /* 9bit days + hours minutes seconds */ + rtc->range_max = (1 << 9) * 86400 - 1; + + /* + * Set the start date as beginning of the current year. This can + * be overridden using device tree. + */ + rtc_time64_to_tm(ktime_get_real_seconds(), &tm); + rtc->start_secs = mktime64(tm.tm_year, 1, 1, 0, 0, 0); + rtc->set_start_time = true; + } else { + /* 16bit days + hours minutes seconds */ + rtc->range_max = (1 << 16) * 86400ULL - 1; + } + + pdata->clk_ipg = devm_clk_get_enabled(&pdev->dev, "ipg"); if (IS_ERR(pdata->clk_ipg)) { dev_err(&pdev->dev, "unable to get ipg clock!\n"); return PTR_ERR(pdata->clk_ipg); } - ret = clk_prepare_enable(pdata->clk_ipg); - if (ret) - return ret; - - pdata->clk_ref = devm_clk_get(&pdev->dev, "ref"); + pdata->clk_ref = devm_clk_get_enabled(&pdev->dev, "ref"); if (IS_ERR(pdata->clk_ref)) { dev_err(&pdev->dev, "unable to get ref clock!\n"); - ret = PTR_ERR(pdata->clk_ref); - goto exit_put_clk_ipg; + return PTR_ERR(pdata->clk_ref); } - ret = clk_prepare_enable(pdata->clk_ref); - if (ret) - goto exit_put_clk_ipg; - rate = clk_get_rate(pdata->clk_ref); if (rate == 32768) @@ -407,16 +354,14 @@ static int mxc_rtc_probe(struct platform_device *pdev) reg = RTC_INPUT_CLK_38400HZ; else { dev_err(&pdev->dev, "rtc clock is not valid (%lu)\n", rate); - ret = -EINVAL; - goto exit_put_clk_ref; + return -EINVAL; } reg |= RTC_ENABLE_BIT; writew(reg, (pdata->ioaddr + RTC_RTCCTL)); if (((readw(pdata->ioaddr + RTC_RTCCTL)) & RTC_ENABLE_BIT) == 0) { dev_err(&pdev->dev, "hardware module can't be enabled!\n"); - ret = -EIO; - goto exit_put_clk_ref; + return -EIO; } platform_set_drvdata(pdev, pdata); @@ -431,71 +376,24 @@ static int mxc_rtc_probe(struct platform_device *pdev) pdata->irq = -1; } - if (pdata->irq >= 0) - device_init_wakeup(&pdev->dev, 1); - - rtc = devm_rtc_device_register(&pdev->dev, pdev->name, &mxc_rtc_ops, - THIS_MODULE); - if (IS_ERR(rtc)) { - ret = PTR_ERR(rtc); - goto exit_put_clk_ref; + if (pdata->irq >= 0) { + device_init_wakeup(&pdev->dev, true); + ret = dev_pm_set_wake_irq(&pdev->dev, pdata->irq); + if (ret) + dev_err(&pdev->dev, "failed to enable irq wake\n"); } - pdata->rtc = rtc; - - return 0; - -exit_put_clk_ref: - clk_disable_unprepare(pdata->clk_ref); -exit_put_clk_ipg: - clk_disable_unprepare(pdata->clk_ipg); + ret = devm_rtc_register_device(rtc); return ret; } -static int mxc_rtc_remove(struct platform_device *pdev) -{ - struct rtc_plat_data *pdata = platform_get_drvdata(pdev); - - clk_disable_unprepare(pdata->clk_ref); - clk_disable_unprepare(pdata->clk_ipg); - - return 0; -} - -#ifdef CONFIG_PM_SLEEP -static int mxc_rtc_suspend(struct device *dev) -{ - struct rtc_plat_data *pdata = dev_get_drvdata(dev); - - if (device_may_wakeup(dev)) - enable_irq_wake(pdata->irq); - - return 0; -} - -static int mxc_rtc_resume(struct device *dev) -{ - struct rtc_plat_data *pdata = dev_get_drvdata(dev); - - if (device_may_wakeup(dev)) - disable_irq_wake(pdata->irq); - - return 0; -} -#endif - -static SIMPLE_DEV_PM_OPS(mxc_rtc_pm_ops, mxc_rtc_suspend, mxc_rtc_resume); - static struct platform_driver mxc_rtc_driver = { .driver = { .name = "mxc_rtc", - .of_match_table = of_match_ptr(imx_rtc_dt_ids), - .pm = &mxc_rtc_pm_ops, + .of_match_table = imx_rtc_dt_ids, }, - .id_table = imx_rtc_devtype, .probe = mxc_rtc_probe, - .remove = mxc_rtc_remove, }; module_platform_driver(mxc_rtc_driver) |