diff options
Diffstat (limited to 'drivers/rtc/rtc-mxc.c')
| -rw-r--r-- | drivers/rtc/rtc-mxc.c | 286 |
1 files changed, 90 insertions, 196 deletions
diff --git a/drivers/rtc/rtc-mxc.c b/drivers/rtc/rtc-mxc.c index ab87bacb8f88..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> @@ -15,7 +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> #define RTC_INPUT_CLK_32768HZ (0x00 << 5) #define RTC_INPUT_CLK_32000HZ (0x01 << 5) @@ -41,17 +36,6 @@ #define MAX_PIE_NUM 9 #define MAX_PIE_FREQ 512 -static const u32 PIE_BIT_DEF[MAX_PIE_NUM][2] = { - { 2, RTC_2HZ_BIT }, - { 4, RTC_SAM0_BIT }, - { 8, RTC_SAM1_BIT }, - { 16, RTC_SAM2_BIT }, - { 32, RTC_SAM3_BIT }, - { 64, RTC_SAM4_BIT }, - { 128, RTC_SAM5_BIT }, - { 256, RTC_SAM6_BIT }, - { MAX_PIE_FREQ, RTC_SAM7_BIT }, -}; #define MXC_RTC_TIME 0 #define MXC_RTC_ALARM 1 @@ -79,23 +63,18 @@ struct rtc_plat_data { struct rtc_device *rtc; void __iomem *ioaddr; int irq; - struct clk *clk; + struct clk *clk_ref; + struct clk *clk_ipg; struct rtc_time g_rtc_alarm; enum imx_rtc_type devtype; }; -static struct platform_device_id imx_rtc_devtype[] = { - { - .name = "imx1-rtc", - .driver_data = IMX1_RTC, - }, { - .name = "imx21-rtc", - .driver_data = IMX21_RTC, - }, { - /* sentinel */ - } +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(platform, imx_rtc_devtype); +MODULE_DEVICE_TABLE(of, imx_rtc_dt_ids); static inline int is_imx1_rtc(struct rtc_plat_data *data) { @@ -106,10 +85,9 @@ static inline int is_imx1_rtc(struct rtc_plat_data *data) * This function is used to obtain the RTC time or the alarm value in * second. */ -static u32 get_alarm_or_time(struct device *dev, int time_alarm) +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; @@ -129,29 +107,27 @@ static u32 get_alarm_or_time(struct device *dev, int time_alarm) hr = hr_min >> 8; min = hr_min & 0xff; - return (((day * 24 + hr) * 60) + min) * 60 + sec; + return ((((time64_t)day * 24 + hr) * 60) + min) * 60 + sec; } /* * This function sets the RTC alarm value or the time value. */ -static void set_alarm_or_time(struct device *dev, int time_alarm, u32 time) +static void set_alarm_or_time(struct device *dev, int time_alarm, time64_t time) { - u32 day, hr, min, sec, temp; - struct platform_device *pdev = to_platform_device(dev); - struct rtc_plat_data *pdata = platform_get_drvdata(pdev); + u32 tod, day, hr, min, sec, temp; + struct rtc_plat_data *pdata = dev_get_drvdata(dev); void __iomem *ioaddr = pdata->ioaddr; - day = time / 86400; - time -= day * 86400; + day = div_s64_rem(time, 86400, &tod); /* time is within a day now */ - hr = time / 3600; - time -= hr * 3600; + hr = tod / 3600; + tod -= hr * 3600; /* time is within an hour now */ - min = time / 60; - sec = time - min * 60; + min = tod / 60; + sec = tod - min * 60; temp = (hr << 8) + min; @@ -173,40 +149,28 @@ static void set_alarm_or_time(struct device *dev, int time_alarm, u32 time) * This function updates the RTC alarm registers and then clears all the * interrupt status bits. */ -static int rtc_update_alarm(struct device *dev, struct rtc_time *alrm) +static void rtc_update_alarm(struct device *dev, struct rtc_time *alrm) { - struct rtc_time alarm_tm, now_tm; - unsigned long now, time; - struct platform_device *pdev = to_platform_device(dev); - struct rtc_plat_data *pdata = platform_get_drvdata(pdev); + time64_t time; + struct rtc_plat_data *pdata = dev_get_drvdata(dev); void __iomem *ioaddr = pdata->ioaddr; - now = get_alarm_or_time(dev, MXC_RTC_TIME); - rtc_time_to_tm(now, &now_tm); - alarm_tm.tm_year = now_tm.tm_year; - alarm_tm.tm_mon = now_tm.tm_mon; - alarm_tm.tm_mday = now_tm.tm_mday; - alarm_tm.tm_hour = alrm->tm_hour; - alarm_tm.tm_min = alrm->tm_min; - alarm_tm.tm_sec = alrm->tm_sec; - rtc_tm_to_time(&alarm_tm, &time); + time = rtc_tm_to_time64(alrm); /* clear all the interrupt status bits */ writew(readw(ioaddr + RTC_RTCISR), ioaddr + RTC_RTCISR); set_alarm_or_time(dev, MXC_RTC_ALARM, time); - - return 0; } 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) @@ -215,7 +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. */ @@ -224,11 +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); @@ -240,38 +203,15 @@ static irqreturn_t mxc_rtc_interrupt(int irq, void *dev_id) mxc_rtc_irq_enable(&pdev->dev, RTC_ALM_BIT, 0); } - if (status & RTC_1HZ_BIT) - events |= (RTC_UF | RTC_IRQF); - if (status & PIT_ALL_ON) 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); @@ -283,14 +223,14 @@ static int mxc_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) */ static int mxc_rtc_read_time(struct device *dev, struct rtc_time *tm) { - u32 val; + time64_t val; /* Avoid roll-over from reading the different registers */ do { val = get_alarm_or_time(dev, MXC_RTC_TIME); } while (val != get_alarm_or_time(dev, MXC_RTC_TIME)); - rtc_time_to_tm(val, tm); + rtc_time64_to_tm(val, tm); return 0; } @@ -298,21 +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, unsigned long 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_time_to_tm(time, &tm); - tm.tm_year = 70; - rtc_tm_to_time(&tm, &time); - } + time64_t time = rtc_tm_to_time64(tm); /* Avoid roll-over from reading the different registers */ do { @@ -329,11 +257,10 @@ static int mxc_rtc_set_mmss(struct device *dev, unsigned long 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_time_to_tm(get_alarm_or_time(dev, MXC_RTC_ALARM), &alrm->time); + rtc_time64_to_tm(get_alarm_or_time(dev, MXC_RTC_ALARM), &alrm->time); alrm->pending = ((readw(ioaddr + RTC_RTCISR) & RTC_ALM_BIT)) ? 1 : 0; return 0; @@ -344,13 +271,9 @@ 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); - int ret; + struct rtc_plat_data *pdata = dev_get_drvdata(dev); - ret = rtc_update_alarm(dev, &alrm->time); - if (ret) - return ret; + rtc_update_alarm(dev, &alrm->time); memcpy(&pdata->g_rtc_alarm, &alrm->time, sizeof(struct rtc_time)); mxc_rtc_irq_enable(dev, RTC_ALM_BIT, alrm->enabled); @@ -359,10 +282,9 @@ static int mxc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) } /* RTC layer */ -static struct rtc_class_ops mxc_rtc_ops = { - .release = mxc_rtc_release, +static const struct rtc_class_ops mxc_rtc_ops = { .read_time = mxc_rtc_read_time, - .set_mmss = 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, @@ -370,39 +292,59 @@ static 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; - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) - return -ENODEV; - pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; - pdata->devtype = pdev->id_entry->driver_data; + pdata->devtype = (uintptr_t)of_device_get_match_data(&pdev->dev); + + pdata->ioaddr = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(pdata->ioaddr)) + return PTR_ERR(pdata->ioaddr); + + 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; - if (!devm_request_mem_region(&pdev->dev, res->start, - resource_size(res), pdev->name)) - return -EBUSY; + /* 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->ioaddr = devm_ioremap(&pdev->dev, res->start, - resource_size(res)); + 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); + } - pdata->clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(pdata->clk)) { - dev_err(&pdev->dev, "unable to get clock!\n"); - ret = PTR_ERR(pdata->clk); - goto exit_free_pdata; + 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"); + return PTR_ERR(pdata->clk_ref); } - clk_prepare_enable(pdata->clk); - rate = clk_get_rate(pdata->clk); + rate = clk_get_rate(pdata->clk_ref); if (rate == 32768) reg = RTC_INPUT_CLK_32768HZ; @@ -412,16 +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; + 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; + return -EIO; } platform_set_drvdata(pdev, pdata); @@ -436,70 +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; + 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: - clk_disable_unprepare(pdata->clk); - -exit_free_pdata: + 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); - - 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", - .pm = &mxc_rtc_pm_ops, - .owner = THIS_MODULE, + .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) |