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-sunxi.c | 486 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 486 insertions(+) create mode 100644 drivers/rtc/rtc-sunxi.c (limited to 'drivers/rtc/rtc-sunxi.c') diff --git a/drivers/rtc/rtc-sunxi.c b/drivers/rtc/rtc-sunxi.c new file mode 100644 index 000000000..5cab9953c --- /dev/null +++ b/drivers/rtc/rtc-sunxi.c @@ -0,0 +1,486 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * An RTC driver for Allwinner A10/A20 + * + * Copyright (c) 2013, Carlo Caione + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define SUNXI_LOSC_CTRL 0x0000 +#define SUNXI_LOSC_CTRL_RTC_HMS_ACC BIT(8) +#define SUNXI_LOSC_CTRL_RTC_YMD_ACC BIT(7) + +#define SUNXI_RTC_YMD 0x0004 + +#define SUNXI_RTC_HMS 0x0008 + +#define SUNXI_ALRM_DHMS 0x000c + +#define SUNXI_ALRM_EN 0x0014 +#define SUNXI_ALRM_EN_CNT_EN BIT(8) + +#define SUNXI_ALRM_IRQ_EN 0x0018 +#define SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN BIT(0) + +#define SUNXI_ALRM_IRQ_STA 0x001c +#define SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND BIT(0) + +#define SUNXI_MASK_DH 0x0000001f +#define SUNXI_MASK_SM 0x0000003f +#define SUNXI_MASK_M 0x0000000f +#define SUNXI_MASK_LY 0x00000001 +#define SUNXI_MASK_D 0x00000ffe +#define SUNXI_MASK_M 0x0000000f + +#define SUNXI_GET(x, mask, shift) (((x) & ((mask) << (shift))) \ + >> (shift)) + +#define SUNXI_SET(x, mask, shift) (((x) & (mask)) << (shift)) + +/* + * Get date values + */ +#define SUNXI_DATE_GET_DAY_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 0) +#define SUNXI_DATE_GET_MON_VALUE(x) SUNXI_GET(x, SUNXI_MASK_M, 8) +#define SUNXI_DATE_GET_YEAR_VALUE(x, mask) SUNXI_GET(x, mask, 16) + +/* + * Get time values + */ +#define SUNXI_TIME_GET_SEC_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 0) +#define SUNXI_TIME_GET_MIN_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 8) +#define SUNXI_TIME_GET_HOUR_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 16) + +/* + * Get alarm values + */ +#define SUNXI_ALRM_GET_SEC_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 0) +#define SUNXI_ALRM_GET_MIN_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 8) +#define SUNXI_ALRM_GET_HOUR_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 16) + +/* + * Set date values + */ +#define SUNXI_DATE_SET_DAY_VALUE(x) SUNXI_DATE_GET_DAY_VALUE(x) +#define SUNXI_DATE_SET_MON_VALUE(x) SUNXI_SET(x, SUNXI_MASK_M, 8) +#define SUNXI_DATE_SET_YEAR_VALUE(x, mask) SUNXI_SET(x, mask, 16) +#define SUNXI_LEAP_SET_VALUE(x, shift) SUNXI_SET(x, SUNXI_MASK_LY, shift) + +/* + * Set time values + */ +#define SUNXI_TIME_SET_SEC_VALUE(x) SUNXI_TIME_GET_SEC_VALUE(x) +#define SUNXI_TIME_SET_MIN_VALUE(x) SUNXI_SET(x, SUNXI_MASK_SM, 8) +#define SUNXI_TIME_SET_HOUR_VALUE(x) SUNXI_SET(x, SUNXI_MASK_DH, 16) + +/* + * Set alarm values + */ +#define SUNXI_ALRM_SET_SEC_VALUE(x) SUNXI_ALRM_GET_SEC_VALUE(x) +#define SUNXI_ALRM_SET_MIN_VALUE(x) SUNXI_SET(x, SUNXI_MASK_SM, 8) +#define SUNXI_ALRM_SET_HOUR_VALUE(x) SUNXI_SET(x, SUNXI_MASK_DH, 16) +#define SUNXI_ALRM_SET_DAY_VALUE(x) SUNXI_SET(x, SUNXI_MASK_D, 21) + +/* + * Time unit conversions + */ +#define SEC_IN_MIN 60 +#define SEC_IN_HOUR (60 * SEC_IN_MIN) +#define SEC_IN_DAY (24 * SEC_IN_HOUR) + +/* + * The year parameter passed to the driver is usually an offset relative to + * the year 1900. This macro is used to convert this offset to another one + * relative to the minimum year allowed by the hardware. + */ +#define SUNXI_YEAR_OFF(x) ((x)->min - 1900) + +/* + * min and max year are arbitrary set considering the limited range of the + * hardware register field + */ +struct sunxi_rtc_data_year { + unsigned int min; /* min year allowed */ + unsigned int max; /* max year allowed */ + unsigned int mask; /* mask for the year field */ + unsigned char leap_shift; /* bit shift to get the leap year */ +}; + +static const struct sunxi_rtc_data_year data_year_param[] = { + [0] = { + .min = 2010, + .max = 2073, + .mask = 0x3f, + .leap_shift = 22, + }, + [1] = { + .min = 1970, + .max = 2225, + .mask = 0xff, + .leap_shift = 24, + }, +}; + +struct sunxi_rtc_dev { + struct rtc_device *rtc; + struct device *dev; + const struct sunxi_rtc_data_year *data_year; + void __iomem *base; + int irq; +}; + +static irqreturn_t sunxi_rtc_alarmirq(int irq, void *id) +{ + struct sunxi_rtc_dev *chip = (struct sunxi_rtc_dev *) id; + u32 val; + + val = readl(chip->base + SUNXI_ALRM_IRQ_STA); + + if (val & SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND) { + val |= SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND; + writel(val, chip->base + SUNXI_ALRM_IRQ_STA); + + rtc_update_irq(chip->rtc, 1, RTC_AF | RTC_IRQF); + + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static void sunxi_rtc_setaie(unsigned int to, struct sunxi_rtc_dev *chip) +{ + u32 alrm_val = 0; + u32 alrm_irq_val = 0; + + if (to) { + alrm_val = readl(chip->base + SUNXI_ALRM_EN); + alrm_val |= SUNXI_ALRM_EN_CNT_EN; + + alrm_irq_val = readl(chip->base + SUNXI_ALRM_IRQ_EN); + alrm_irq_val |= SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN; + } else { + writel(SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND, + chip->base + SUNXI_ALRM_IRQ_STA); + } + + writel(alrm_val, chip->base + SUNXI_ALRM_EN); + writel(alrm_irq_val, chip->base + SUNXI_ALRM_IRQ_EN); +} + +static int sunxi_rtc_getalarm(struct device *dev, struct rtc_wkalrm *wkalrm) +{ + struct sunxi_rtc_dev *chip = dev_get_drvdata(dev); + struct rtc_time *alrm_tm = &wkalrm->time; + u32 alrm; + u32 alrm_en; + u32 date; + + alrm = readl(chip->base + SUNXI_ALRM_DHMS); + date = readl(chip->base + SUNXI_RTC_YMD); + + alrm_tm->tm_sec = SUNXI_ALRM_GET_SEC_VALUE(alrm); + alrm_tm->tm_min = SUNXI_ALRM_GET_MIN_VALUE(alrm); + alrm_tm->tm_hour = SUNXI_ALRM_GET_HOUR_VALUE(alrm); + + alrm_tm->tm_mday = SUNXI_DATE_GET_DAY_VALUE(date); + alrm_tm->tm_mon = SUNXI_DATE_GET_MON_VALUE(date); + alrm_tm->tm_year = SUNXI_DATE_GET_YEAR_VALUE(date, + chip->data_year->mask); + + alrm_tm->tm_mon -= 1; + + /* + * switch from (data_year->min)-relative offset to + * a (1900)-relative one + */ + alrm_tm->tm_year += SUNXI_YEAR_OFF(chip->data_year); + + alrm_en = readl(chip->base + SUNXI_ALRM_IRQ_EN); + if (alrm_en & SUNXI_ALRM_EN_CNT_EN) + wkalrm->enabled = 1; + + return 0; +} + +static int sunxi_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) +{ + struct sunxi_rtc_dev *chip = dev_get_drvdata(dev); + u32 date, time; + + /* + * read again in case it changes + */ + do { + date = readl(chip->base + SUNXI_RTC_YMD); + time = readl(chip->base + SUNXI_RTC_HMS); + } while ((date != readl(chip->base + SUNXI_RTC_YMD)) || + (time != readl(chip->base + SUNXI_RTC_HMS))); + + rtc_tm->tm_sec = SUNXI_TIME_GET_SEC_VALUE(time); + rtc_tm->tm_min = SUNXI_TIME_GET_MIN_VALUE(time); + rtc_tm->tm_hour = SUNXI_TIME_GET_HOUR_VALUE(time); + + rtc_tm->tm_mday = SUNXI_DATE_GET_DAY_VALUE(date); + rtc_tm->tm_mon = SUNXI_DATE_GET_MON_VALUE(date); + rtc_tm->tm_year = SUNXI_DATE_GET_YEAR_VALUE(date, + chip->data_year->mask); + + rtc_tm->tm_mon -= 1; + + /* + * switch from (data_year->min)-relative offset to + * a (1900)-relative one + */ + rtc_tm->tm_year += SUNXI_YEAR_OFF(chip->data_year); + + return 0; +} + +static int sunxi_rtc_setalarm(struct device *dev, struct rtc_wkalrm *wkalrm) +{ + struct sunxi_rtc_dev *chip = dev_get_drvdata(dev); + struct rtc_time *alrm_tm = &wkalrm->time; + struct rtc_time tm_now; + u32 alrm; + time64_t diff; + unsigned long time_gap; + unsigned long time_gap_day; + unsigned long time_gap_hour; + unsigned long time_gap_min; + int ret; + + ret = sunxi_rtc_gettime(dev, &tm_now); + if (ret < 0) { + dev_err(dev, "Error in getting time\n"); + return -EINVAL; + } + + diff = rtc_tm_sub(alrm_tm, &tm_now); + if (diff <= 0) { + dev_err(dev, "Date to set in the past\n"); + return -EINVAL; + } + + if (diff > 255 * SEC_IN_DAY) { + dev_err(dev, "Day must be in the range 0 - 255\n"); + return -EINVAL; + } + + time_gap = diff; + time_gap_day = time_gap / SEC_IN_DAY; + time_gap -= time_gap_day * SEC_IN_DAY; + time_gap_hour = time_gap / SEC_IN_HOUR; + time_gap -= time_gap_hour * SEC_IN_HOUR; + time_gap_min = time_gap / SEC_IN_MIN; + time_gap -= time_gap_min * SEC_IN_MIN; + + sunxi_rtc_setaie(0, chip); + writel(0, chip->base + SUNXI_ALRM_DHMS); + usleep_range(100, 300); + + alrm = SUNXI_ALRM_SET_SEC_VALUE(time_gap) | + SUNXI_ALRM_SET_MIN_VALUE(time_gap_min) | + SUNXI_ALRM_SET_HOUR_VALUE(time_gap_hour) | + SUNXI_ALRM_SET_DAY_VALUE(time_gap_day); + writel(alrm, chip->base + SUNXI_ALRM_DHMS); + + writel(0, chip->base + SUNXI_ALRM_IRQ_EN); + writel(SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN, chip->base + SUNXI_ALRM_IRQ_EN); + + sunxi_rtc_setaie(wkalrm->enabled, chip); + + return 0; +} + +static int sunxi_rtc_wait(struct sunxi_rtc_dev *chip, int offset, + unsigned int mask, unsigned int ms_timeout) +{ + const unsigned long timeout = jiffies + msecs_to_jiffies(ms_timeout); + u32 reg; + + do { + reg = readl(chip->base + offset); + reg &= mask; + + if (reg == mask) + return 0; + + } while (time_before(jiffies, timeout)); + + return -ETIMEDOUT; +} + +static int sunxi_rtc_settime(struct device *dev, struct rtc_time *rtc_tm) +{ + struct sunxi_rtc_dev *chip = dev_get_drvdata(dev); + u32 date = 0; + u32 time = 0; + unsigned int year; + + /* + * the input rtc_tm->tm_year is the offset relative to 1900. We use + * the SUNXI_YEAR_OFF macro to rebase it with respect to the min year + * allowed by the hardware + */ + + year = rtc_tm->tm_year + 1900; + if (year < chip->data_year->min || year > chip->data_year->max) { + dev_err(dev, "rtc only supports year in range %u - %u\n", + chip->data_year->min, chip->data_year->max); + return -EINVAL; + } + + rtc_tm->tm_year -= SUNXI_YEAR_OFF(chip->data_year); + rtc_tm->tm_mon += 1; + + date = SUNXI_DATE_SET_DAY_VALUE(rtc_tm->tm_mday) | + SUNXI_DATE_SET_MON_VALUE(rtc_tm->tm_mon) | + SUNXI_DATE_SET_YEAR_VALUE(rtc_tm->tm_year, + chip->data_year->mask); + + if (is_leap_year(year)) + date |= SUNXI_LEAP_SET_VALUE(1, chip->data_year->leap_shift); + + time = SUNXI_TIME_SET_SEC_VALUE(rtc_tm->tm_sec) | + SUNXI_TIME_SET_MIN_VALUE(rtc_tm->tm_min) | + SUNXI_TIME_SET_HOUR_VALUE(rtc_tm->tm_hour); + + writel(0, chip->base + SUNXI_RTC_HMS); + writel(0, chip->base + SUNXI_RTC_YMD); + + writel(time, chip->base + SUNXI_RTC_HMS); + + /* + * After writing the RTC HH-MM-SS register, the + * SUNXI_LOSC_CTRL_RTC_HMS_ACC bit is set and it will not + * be cleared until the real writing operation is finished + */ + + if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL, + SUNXI_LOSC_CTRL_RTC_HMS_ACC, 50)) { + dev_err(dev, "Failed to set rtc time.\n"); + return -1; + } + + writel(date, chip->base + SUNXI_RTC_YMD); + + /* + * After writing the RTC YY-MM-DD register, the + * SUNXI_LOSC_CTRL_RTC_YMD_ACC bit is set and it will not + * be cleared until the real writing operation is finished + */ + + if (sunxi_rtc_wait(chip, SUNXI_LOSC_CTRL, + SUNXI_LOSC_CTRL_RTC_YMD_ACC, 50)) { + dev_err(dev, "Failed to set rtc time.\n"); + return -1; + } + + return 0; +} + +static int sunxi_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) +{ + struct sunxi_rtc_dev *chip = dev_get_drvdata(dev); + + if (!enabled) + sunxi_rtc_setaie(enabled, chip); + + return 0; +} + +static const struct rtc_class_ops sunxi_rtc_ops = { + .read_time = sunxi_rtc_gettime, + .set_time = sunxi_rtc_settime, + .read_alarm = sunxi_rtc_getalarm, + .set_alarm = sunxi_rtc_setalarm, + .alarm_irq_enable = sunxi_rtc_alarm_irq_enable +}; + +static const struct of_device_id sunxi_rtc_dt_ids[] = { + { .compatible = "allwinner,sun4i-a10-rtc", .data = &data_year_param[0] }, + { .compatible = "allwinner,sun7i-a20-rtc", .data = &data_year_param[1] }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, sunxi_rtc_dt_ids); + +static int sunxi_rtc_probe(struct platform_device *pdev) +{ + struct sunxi_rtc_dev *chip; + int ret; + + chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + platform_set_drvdata(pdev, chip); + chip->dev = &pdev->dev; + + chip->rtc = devm_rtc_allocate_device(&pdev->dev); + if (IS_ERR(chip->rtc)) + return PTR_ERR(chip->rtc); + + chip->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(chip->base)) + return PTR_ERR(chip->base); + + chip->irq = platform_get_irq(pdev, 0); + if (chip->irq < 0) + return chip->irq; + ret = devm_request_irq(&pdev->dev, chip->irq, sunxi_rtc_alarmirq, + 0, dev_name(&pdev->dev), chip); + if (ret) { + dev_err(&pdev->dev, "Could not request IRQ\n"); + return ret; + } + + chip->data_year = of_device_get_match_data(&pdev->dev); + if (!chip->data_year) { + dev_err(&pdev->dev, "Unable to setup RTC data\n"); + return -ENODEV; + } + + /* clear the alarm count value */ + writel(0, chip->base + SUNXI_ALRM_DHMS); + + /* disable alarm, not generate irq pending */ + writel(0, chip->base + SUNXI_ALRM_EN); + + /* disable alarm week/cnt irq, unset to cpu */ + writel(0, chip->base + SUNXI_ALRM_IRQ_EN); + + /* clear alarm week/cnt irq pending */ + writel(SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND, chip->base + + SUNXI_ALRM_IRQ_STA); + + chip->rtc->ops = &sunxi_rtc_ops; + + return devm_rtc_register_device(chip->rtc); +} + +static struct platform_driver sunxi_rtc_driver = { + .probe = sunxi_rtc_probe, + .driver = { + .name = "sunxi-rtc", + .of_match_table = sunxi_rtc_dt_ids, + }, +}; + +module_platform_driver(sunxi_rtc_driver); + +MODULE_DESCRIPTION("sunxi RTC driver"); +MODULE_AUTHOR("Carlo Caione "); +MODULE_LICENSE("GPL"); -- cgit v1.3.1