From 034dd340b08be1f2f0477ad16131d609f9dbd53c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 30 Aug 2026 09:22:00 -0700 Subject: Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Fix error output of boot instance creation failure Currently if a boot instance creation fails, instead of printing out the name of the instance that failed, it prints "(null)". That is because it prints "cur_str" that had already been processed by strsep(). Print the saved name instead. While at it, print the error code of the failure. - Fix use-after-free for same named historgrams Histograms can be named so that they can be used in multiple events. But if the named histogram has a variable attached, the second event that uses the named histogram which duplicates it and needs to free the original after duplication leaves the old variable in place and still visible. If another histogram uses than variable, it will use the stale one which will try to reference the freed duplicate histogram and crash the kernel. Free the duplicate variables along with the duplicated histogram data. - Check return value of kthread_run() in event self test The events self tests uses a kthread for testing but does not check if it succeeded in creating a kthread. If the kthread creation were to fail, the code will still try to call kthread_stop() on the error returned. - Fix race between reading trace_pipe and updating subbuffer size If a user is reading the trace_pipe file at the same time they update the ring buffer sub-buffer size, can cause the trace_pipe read to read stale data. Add trace_access_lock() around updating the ring buffer sub-buffer size. - Fix eventfs_inode on failure path in creation of the events directory In the creation of the "events" directory, if after allocating the eventfs_inode a failure is detected, it calls cleanup_ei() which calls free_ei(). The free_ei() will test if eventfs_inode being freed has no children. It is a bug if it does. But on the failure case of the creation of the "events" directory, the children lists have not yet been initialized and the free will trigger a warning because list_empty() on an uninitialized list returns false. Move the initialization into init_ei() where it makes more sense and makes sure that a created eventfs_inode has its lists initialized upon creation. - Check return value of kthread_run() in ftrace direct sample code The sample code that shows how to use the ftrace direct calls does not test the return of kthread_run() to see if it succeeds. Return a failure if the kthread_run() doesn't succeed. - Clear user events state on fork in case of alloc failure On fork, the child gets a pointer to the parent's user events state. It makes a copy of it then updates the child's pointer to it. But if the allocation fails, the duplication function leaves the child with a pointer to its parent's descriptor. When the child cleans up its data, it will free the parent's descriptor while the parent is still using it. In the duplication function, set the child's user_event_mm to NULL before testing if the allocation succeeded, and when it exits it will not free the parent's descriptor. - Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to 8 and post-decrements it only after a failed link replacement. On the final attempt, a successful replacement leaves retry at zero, while a failed replacement leaves it at -1. But the check for success expects the retry value to be non-zero and exits with an error on zero. This is the opposite result. Fix it. - Fail nicely when the remote swap_reader_page() returns an error Currently, if the swap_reader_page() of a remote buffer fails, it triggers a WARN_ON_ONCE() and continues normally. Instead, have it exit with an error and a pr_warn() print instead of a full WARNING. * tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: ring-buffer: Stop remote reader update when page swap fails tracing: Fix retry exhaustion in simple ring buffer reader swap tracing/user_events: Clear copied tracing state before fork duplication samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify eventfs: Initialize ei->children and ei->list in init_ei() tracing: Fix use-after-free in trace_pipe read on sub-buffer order change tracing: Fix crash passing ERR_PTR to kthread_stop() tracing: Fix use-after-free with same-name named triggers tracing: Fix logged instance name on creation failure --- drivers/rtc/rtc-mt2712.c | 413 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 413 insertions(+) create mode 100644 drivers/rtc/rtc-mt2712.c (limited to 'drivers/rtc/rtc-mt2712.c') diff --git a/drivers/rtc/rtc-mt2712.c b/drivers/rtc/rtc-mt2712.c new file mode 100644 index 000000000..cd92a9788 --- /dev/null +++ b/drivers/rtc/rtc-mt2712.c @@ -0,0 +1,413 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2019 MediaTek Inc. + * Author: Ran Bi + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MT2712_BBPU 0x0000 +#define MT2712_BBPU_CLRPKY BIT(4) +#define MT2712_BBPU_RELOAD BIT(5) +#define MT2712_BBPU_CBUSY BIT(6) +#define MT2712_BBPU_KEY (0x43 << 8) + +#define MT2712_IRQ_STA 0x0004 +#define MT2712_IRQ_STA_AL BIT(0) +#define MT2712_IRQ_STA_TC BIT(1) + +#define MT2712_IRQ_EN 0x0008 +#define MT2712_IRQ_EN_AL BIT(0) +#define MT2712_IRQ_EN_TC BIT(1) +#define MT2712_IRQ_EN_ONESHOT BIT(2) + +#define MT2712_CII_EN 0x000c + +#define MT2712_AL_MASK 0x0010 +#define MT2712_AL_MASK_DOW BIT(4) + +#define MT2712_TC_SEC 0x0014 +#define MT2712_TC_MIN 0x0018 +#define MT2712_TC_HOU 0x001c +#define MT2712_TC_DOM 0x0020 +#define MT2712_TC_DOW 0x0024 +#define MT2712_TC_MTH 0x0028 +#define MT2712_TC_YEA 0x002c + +#define MT2712_AL_SEC 0x0030 +#define MT2712_AL_MIN 0x0034 +#define MT2712_AL_HOU 0x0038 +#define MT2712_AL_DOM 0x003c +#define MT2712_AL_DOW 0x0040 +#define MT2712_AL_MTH 0x0044 +#define MT2712_AL_YEA 0x0048 + +#define MT2712_SEC_MASK 0x003f +#define MT2712_MIN_MASK 0x003f +#define MT2712_HOU_MASK 0x001f +#define MT2712_DOM_MASK 0x001f +#define MT2712_DOW_MASK 0x0007 +#define MT2712_MTH_MASK 0x000f +#define MT2712_YEA_MASK 0x007f + +#define MT2712_POWERKEY1 0x004c +#define MT2712_POWERKEY2 0x0050 +#define MT2712_POWERKEY1_KEY 0xa357 +#define MT2712_POWERKEY2_KEY 0x67d2 + +#define MT2712_CON0 0x005c +#define MT2712_CON1 0x0060 + +#define MT2712_PROT 0x0070 +#define MT2712_PROT_UNLOCK1 0x9136 +#define MT2712_PROT_UNLOCK2 0x586a + +#define MT2712_WRTGR 0x0078 + +#define MT2712_RTC_TIMESTAMP_END_2127 4985971199LL + +struct mt2712_rtc { + struct rtc_device *rtc; + void __iomem *base; + int irq; + u8 irq_wake_enabled; + u8 powerlost; +}; + +static inline u32 mt2712_readl(struct mt2712_rtc *mt2712_rtc, u32 reg) +{ + return readl(mt2712_rtc->base + reg); +} + +static inline void mt2712_writel(struct mt2712_rtc *mt2712_rtc, + u32 reg, u32 val) +{ + writel(val, mt2712_rtc->base + reg); +} + +static void mt2712_rtc_write_trigger(struct mt2712_rtc *mt2712_rtc) +{ + unsigned long timeout = jiffies + HZ / 10; + + mt2712_writel(mt2712_rtc, MT2712_WRTGR, 1); + while (1) { + if (!(mt2712_readl(mt2712_rtc, MT2712_BBPU) + & MT2712_BBPU_CBUSY)) + break; + + if (time_after(jiffies, timeout)) { + dev_err(&mt2712_rtc->rtc->dev, + "%s time out!\n", __func__); + break; + } + cpu_relax(); + } +} + +static void mt2712_rtc_writeif_unlock(struct mt2712_rtc *mt2712_rtc) +{ + mt2712_writel(mt2712_rtc, MT2712_PROT, MT2712_PROT_UNLOCK1); + mt2712_rtc_write_trigger(mt2712_rtc); + mt2712_writel(mt2712_rtc, MT2712_PROT, MT2712_PROT_UNLOCK2); + mt2712_rtc_write_trigger(mt2712_rtc); +} + +static irqreturn_t rtc_irq_handler_thread(int irq, void *data) +{ + struct mt2712_rtc *mt2712_rtc = data; + u16 irqsta; + + /* Clear interrupt */ + irqsta = mt2712_readl(mt2712_rtc, MT2712_IRQ_STA); + if (irqsta & MT2712_IRQ_STA_AL) { + rtc_update_irq(mt2712_rtc->rtc, 1, RTC_IRQF | RTC_AF); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static void __mt2712_rtc_read_time(struct mt2712_rtc *mt2712_rtc, + struct rtc_time *tm, int *sec) +{ + tm->tm_sec = mt2712_readl(mt2712_rtc, MT2712_TC_SEC) + & MT2712_SEC_MASK; + tm->tm_min = mt2712_readl(mt2712_rtc, MT2712_TC_MIN) + & MT2712_MIN_MASK; + tm->tm_hour = mt2712_readl(mt2712_rtc, MT2712_TC_HOU) + & MT2712_HOU_MASK; + tm->tm_mday = mt2712_readl(mt2712_rtc, MT2712_TC_DOM) + & MT2712_DOM_MASK; + tm->tm_mon = (mt2712_readl(mt2712_rtc, MT2712_TC_MTH) - 1) + & MT2712_MTH_MASK; + tm->tm_year = (mt2712_readl(mt2712_rtc, MT2712_TC_YEA) + 100) + & MT2712_YEA_MASK; + + *sec = mt2712_readl(mt2712_rtc, MT2712_TC_SEC) & MT2712_SEC_MASK; +} + +static int mt2712_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct mt2712_rtc *mt2712_rtc = dev_get_drvdata(dev); + int sec; + + if (mt2712_rtc->powerlost) + return -EINVAL; + + do { + __mt2712_rtc_read_time(mt2712_rtc, tm, &sec); + } while (sec < tm->tm_sec); /* SEC has carried */ + + return 0; +} + +static int mt2712_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct mt2712_rtc *mt2712_rtc = dev_get_drvdata(dev); + + mt2712_writel(mt2712_rtc, MT2712_TC_SEC, tm->tm_sec & MT2712_SEC_MASK); + mt2712_writel(mt2712_rtc, MT2712_TC_MIN, tm->tm_min & MT2712_MIN_MASK); + mt2712_writel(mt2712_rtc, MT2712_TC_HOU, tm->tm_hour & MT2712_HOU_MASK); + mt2712_writel(mt2712_rtc, MT2712_TC_DOM, tm->tm_mday & MT2712_DOM_MASK); + mt2712_writel(mt2712_rtc, MT2712_TC_MTH, + (tm->tm_mon + 1) & MT2712_MTH_MASK); + mt2712_writel(mt2712_rtc, MT2712_TC_YEA, + (tm->tm_year - 100) & MT2712_YEA_MASK); + + mt2712_rtc_write_trigger(mt2712_rtc); + + if (mt2712_rtc->powerlost) + mt2712_rtc->powerlost = false; + + return 0; +} + +static int mt2712_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) +{ + struct mt2712_rtc *mt2712_rtc = dev_get_drvdata(dev); + struct rtc_time *tm = &alm->time; + u16 irqen; + + irqen = mt2712_readl(mt2712_rtc, MT2712_IRQ_EN); + alm->enabled = !!(irqen & MT2712_IRQ_EN_AL); + + tm->tm_sec = mt2712_readl(mt2712_rtc, MT2712_AL_SEC) & MT2712_SEC_MASK; + tm->tm_min = mt2712_readl(mt2712_rtc, MT2712_AL_MIN) & MT2712_MIN_MASK; + tm->tm_hour = mt2712_readl(mt2712_rtc, MT2712_AL_HOU) & MT2712_HOU_MASK; + tm->tm_mday = mt2712_readl(mt2712_rtc, MT2712_AL_DOM) & MT2712_DOM_MASK; + tm->tm_mon = (mt2712_readl(mt2712_rtc, MT2712_AL_MTH) - 1) + & MT2712_MTH_MASK; + tm->tm_year = (mt2712_readl(mt2712_rtc, MT2712_AL_YEA) + 100) + & MT2712_YEA_MASK; + + return 0; +} + +static int mt2712_rtc_alarm_irq_enable(struct device *dev, + unsigned int enabled) +{ + struct mt2712_rtc *mt2712_rtc = dev_get_drvdata(dev); + u16 irqen; + + irqen = mt2712_readl(mt2712_rtc, MT2712_IRQ_EN); + if (enabled) + irqen |= MT2712_IRQ_EN_AL; + else + irqen &= ~MT2712_IRQ_EN_AL; + mt2712_writel(mt2712_rtc, MT2712_IRQ_EN, irqen); + mt2712_rtc_write_trigger(mt2712_rtc); + + return 0; +} + +static int mt2712_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) +{ + struct mt2712_rtc *mt2712_rtc = dev_get_drvdata(dev); + struct rtc_time *tm = &alm->time; + + dev_dbg(&mt2712_rtc->rtc->dev, "set al time: %ptR, alm en: %d\n", + tm, alm->enabled); + + mt2712_writel(mt2712_rtc, MT2712_AL_SEC, + (mt2712_readl(mt2712_rtc, MT2712_AL_SEC) + & ~(MT2712_SEC_MASK)) | (tm->tm_sec & MT2712_SEC_MASK)); + mt2712_writel(mt2712_rtc, MT2712_AL_MIN, + (mt2712_readl(mt2712_rtc, MT2712_AL_MIN) + & ~(MT2712_MIN_MASK)) | (tm->tm_min & MT2712_MIN_MASK)); + mt2712_writel(mt2712_rtc, MT2712_AL_HOU, + (mt2712_readl(mt2712_rtc, MT2712_AL_HOU) + & ~(MT2712_HOU_MASK)) | (tm->tm_hour & MT2712_HOU_MASK)); + mt2712_writel(mt2712_rtc, MT2712_AL_DOM, + (mt2712_readl(mt2712_rtc, MT2712_AL_DOM) + & ~(MT2712_DOM_MASK)) | (tm->tm_mday & MT2712_DOM_MASK)); + mt2712_writel(mt2712_rtc, MT2712_AL_MTH, + (mt2712_readl(mt2712_rtc, MT2712_AL_MTH) + & ~(MT2712_MTH_MASK)) + | ((tm->tm_mon + 1) & MT2712_MTH_MASK)); + mt2712_writel(mt2712_rtc, MT2712_AL_YEA, + (mt2712_readl(mt2712_rtc, MT2712_AL_YEA) + & ~(MT2712_YEA_MASK)) + | ((tm->tm_year - 100) & MT2712_YEA_MASK)); + + /* mask day of week */ + mt2712_writel(mt2712_rtc, MT2712_AL_MASK, MT2712_AL_MASK_DOW); + mt2712_rtc_write_trigger(mt2712_rtc); + + mt2712_rtc_alarm_irq_enable(dev, alm->enabled); + + return 0; +} + +/* Init RTC register */ +static void mt2712_rtc_hw_init(struct mt2712_rtc *mt2712_rtc) +{ + u32 p1, p2; + + mt2712_writel(mt2712_rtc, MT2712_BBPU, + MT2712_BBPU_KEY | MT2712_BBPU_RELOAD); + + mt2712_writel(mt2712_rtc, MT2712_CII_EN, 0); + mt2712_writel(mt2712_rtc, MT2712_AL_MASK, 0); + /* necessary before set MT2712_POWERKEY */ + mt2712_writel(mt2712_rtc, MT2712_CON0, 0x4848); + mt2712_writel(mt2712_rtc, MT2712_CON1, 0x0048); + + mt2712_rtc_write_trigger(mt2712_rtc); + + p1 = mt2712_readl(mt2712_rtc, MT2712_POWERKEY1); + p2 = mt2712_readl(mt2712_rtc, MT2712_POWERKEY2); + if (p1 != MT2712_POWERKEY1_KEY || p2 != MT2712_POWERKEY2_KEY) { + mt2712_rtc->powerlost = true; + dev_dbg(&mt2712_rtc->rtc->dev, + "powerkey not set (lost power)\n"); + } else { + mt2712_rtc->powerlost = false; + } + + /* RTC need POWERKEY1/2 match, then goto normal work mode */ + mt2712_writel(mt2712_rtc, MT2712_POWERKEY1, MT2712_POWERKEY1_KEY); + mt2712_writel(mt2712_rtc, MT2712_POWERKEY2, MT2712_POWERKEY2_KEY); + mt2712_rtc_write_trigger(mt2712_rtc); + + mt2712_rtc_writeif_unlock(mt2712_rtc); +} + +static const struct rtc_class_ops mt2712_rtc_ops = { + .read_time = mt2712_rtc_read_time, + .set_time = mt2712_rtc_set_time, + .read_alarm = mt2712_rtc_read_alarm, + .set_alarm = mt2712_rtc_set_alarm, + .alarm_irq_enable = mt2712_rtc_alarm_irq_enable, +}; + +static int mt2712_rtc_probe(struct platform_device *pdev) +{ + struct mt2712_rtc *mt2712_rtc; + int ret; + + mt2712_rtc = devm_kzalloc(&pdev->dev, + sizeof(struct mt2712_rtc), GFP_KERNEL); + if (!mt2712_rtc) + return -ENOMEM; + + mt2712_rtc->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(mt2712_rtc->base)) + return PTR_ERR(mt2712_rtc->base); + + /* rtc hw init */ + mt2712_rtc_hw_init(mt2712_rtc); + + mt2712_rtc->irq = platform_get_irq(pdev, 0); + if (mt2712_rtc->irq < 0) + return mt2712_rtc->irq; + + platform_set_drvdata(pdev, mt2712_rtc); + + mt2712_rtc->rtc = devm_rtc_allocate_device(&pdev->dev); + if (IS_ERR(mt2712_rtc->rtc)) + return PTR_ERR(mt2712_rtc->rtc); + + ret = devm_request_threaded_irq(&pdev->dev, mt2712_rtc->irq, NULL, + rtc_irq_handler_thread, + IRQF_ONESHOT | IRQF_TRIGGER_LOW, + dev_name(&mt2712_rtc->rtc->dev), + mt2712_rtc); + if (ret) { + dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n", + mt2712_rtc->irq, ret); + return ret; + } + + device_init_wakeup(&pdev->dev, true); + + mt2712_rtc->rtc->ops = &mt2712_rtc_ops; + mt2712_rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; + mt2712_rtc->rtc->range_max = MT2712_RTC_TIMESTAMP_END_2127; + + return devm_rtc_register_device(mt2712_rtc->rtc); +} + +#ifdef CONFIG_PM_SLEEP +static int mt2712_rtc_suspend(struct device *dev) +{ + int wake_status = 0; + struct mt2712_rtc *mt2712_rtc = dev_get_drvdata(dev); + + if (device_may_wakeup(dev)) { + wake_status = enable_irq_wake(mt2712_rtc->irq); + if (!wake_status) + mt2712_rtc->irq_wake_enabled = true; + } + + return 0; +} + +static int mt2712_rtc_resume(struct device *dev) +{ + int wake_status = 0; + struct mt2712_rtc *mt2712_rtc = dev_get_drvdata(dev); + + if (device_may_wakeup(dev) && mt2712_rtc->irq_wake_enabled) { + wake_status = disable_irq_wake(mt2712_rtc->irq); + if (!wake_status) + mt2712_rtc->irq_wake_enabled = false; + } + + return 0; +} + +static SIMPLE_DEV_PM_OPS(mt2712_pm_ops, mt2712_rtc_suspend, + mt2712_rtc_resume); +#endif + +static const struct of_device_id mt2712_rtc_of_match[] = { + { .compatible = "mediatek,mt2712-rtc", }, + { }, +}; + +MODULE_DEVICE_TABLE(of, mt2712_rtc_of_match); + +static struct platform_driver mt2712_rtc_driver = { + .driver = { + .name = "mt2712-rtc", + .of_match_table = mt2712_rtc_of_match, +#ifdef CONFIG_PM_SLEEP + .pm = &mt2712_pm_ops, +#endif + }, + .probe = mt2712_rtc_probe, +}; + +module_platform_driver(mt2712_rtc_driver); + +MODULE_DESCRIPTION("MediaTek MT2712 SoC based RTC Driver"); +MODULE_AUTHOR("Ran Bi "); +MODULE_LICENSE("GPL"); -- cgit v1.3.1