| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Virupax Sadashivpetimath | 1144 | 62.07% | 1 | 4.55% |
| Mark Godfrey | 353 | 19.15% | 1 | 4.55% |
| Mattias Wallin | 102 | 5.53% | 1 | 4.55% |
| Alexandre Belloni | 88 | 4.77% | 5 | 22.73% |
| Ramesh Chandrasekaran | 46 | 2.50% | 1 | 4.55% |
| Alexandre Torgue | 35 | 1.90% | 1 | 4.55% |
| Sudeep Holla | 31 | 1.68% | 1 | 4.55% |
| Andrew Lynn | 10 | 0.54% | 1 | 4.55% |
| Linus Walleij | 9 | 0.49% | 2 | 9.09% |
| Javier Martinez Canillas | 7 | 0.38% | 1 | 4.55% |
| Jingoo Han | 6 | 0.33% | 1 | 4.55% |
| Lee Jones | 4 | 0.22% | 2 | 9.09% |
| Fabio Estevam | 3 | 0.16% | 1 | 4.55% |
| Thomas Gleixner | 2 | 0.11% | 1 | 4.55% |
| Axel Lin | 2 | 0.11% | 1 | 4.55% |
| Krzysztof Kozlowski | 1 | 0.05% | 1 | 4.55% |
| Total | 1843 | 22 |
// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) ST-Ericsson SA 2010 * * Author: Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com> * * RTC clock driver for the RTC part of the AB8500 Power management chip. * Based on RTC clock driver for the AB3100 Analog Baseband Chip by * Linus Walleij <linus.walleij@stericsson.com> */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/rtc.h> #include <linux/mfd/abx500.h> #include <linux/mfd/abx500/ab8500.h> #include <linux/delay.h> #include <linux/of.h> #include <linux/pm_wakeirq.h> #define AB8500_RTC_SOFF_STAT_REG 0x00 #define AB8500_RTC_CC_CONF_REG 0x01 #define AB8500_RTC_READ_REQ_REG 0x02 #define AB8500_RTC_WATCH_TSECMID_REG 0x03 #define AB8500_RTC_WATCH_TSECHI_REG 0x04 #define AB8500_RTC_WATCH_TMIN_LOW_REG 0x05 #define AB8500_RTC_WATCH_TMIN_MID_REG 0x06 #define AB8500_RTC_WATCH_TMIN_HI_REG 0x07 #define AB8500_RTC_ALRM_MIN_LOW_REG 0x08 #define AB8500_RTC_ALRM_MIN_MID_REG 0x09 #define AB8500_RTC_ALRM_MIN_HI_REG 0x0A #define AB8500_RTC_STAT_REG 0x0B #define AB8500_RTC_BKUP_CHG_REG 0x0C #define AB8500_RTC_FORCE_BKUP_REG 0x0D #define AB8500_RTC_CALIB_REG 0x0E #define AB8500_RTC_SWITCH_STAT_REG 0x0F /* RtcReadRequest bits */ #define RTC_READ_REQUEST 0x01 #define RTC_WRITE_REQUEST 0x02 /* RtcCtrl bits */ #define RTC_ALARM_ENA 0x04 #define RTC_STATUS_DATA 0x01 #define COUNTS_PER_SEC (0xF000 / 60) static const u8 ab8500_rtc_time_regs[] = { AB8500_RTC_WATCH_TMIN_HI_REG, AB8500_RTC_WATCH_TMIN_MID_REG, AB8500_RTC_WATCH_TMIN_LOW_REG, AB8500_RTC_WATCH_TSECHI_REG, AB8500_RTC_WATCH_TSECMID_REG }; static const u8 ab8500_rtc_alarm_regs[] = { AB8500_RTC_ALRM_MIN_HI_REG, AB8500_RTC_ALRM_MIN_MID_REG, AB8500_RTC_ALRM_MIN_LOW_REG }; static int ab8500_rtc_read_time(struct device *dev, struct rtc_time *tm) { unsigned long timeout = jiffies + HZ; int retval, i; unsigned long mins, secs; unsigned char buf[ARRAY_SIZE(ab8500_rtc_time_regs)]; u8 value; /* Request a data read */ retval = abx500_set_register_interruptible(dev, AB8500_RTC, AB8500_RTC_READ_REQ_REG, RTC_READ_REQUEST); if (retval < 0) return retval; /* Wait for some cycles after enabling the rtc read in ab8500 */ while (time_before(jiffies, timeout)) { retval = abx500_get_register_interruptible(dev, AB8500_RTC, AB8500_RTC_READ_REQ_REG, &value); if (retval < 0) return retval; if (!(value & RTC_READ_REQUEST)) break; usleep_range(1000, 5000); } /* Read the Watchtime registers */ for (i = 0; i < ARRAY_SIZE(ab8500_rtc_time_regs); i++) { retval = abx500_get_register_interruptible(dev, AB8500_RTC, ab8500_rtc_time_regs[i], &value); if (retval < 0) return retval; buf[i] = value; } mins = (buf[0] << 16) | (buf[1] << 8) | buf[2]; secs = (buf[3] << 8) | buf[4]; secs = secs / COUNTS_PER_SEC; secs = secs + (mins * 60); rtc_time64_to_tm(secs, tm); return 0; } static int ab8500_rtc_set_time(struct device *dev, struct rtc_time *tm) { int retval, i; unsigned char buf[ARRAY_SIZE(ab8500_rtc_time_regs)]; unsigned long no_secs, no_mins, secs = 0; secs = rtc_tm_to_time64(tm); no_mins = secs / 60; no_secs = secs % 60; /* Make the seconds count as per the RTC resolution */ no_secs = no_secs * COUNTS_PER_SEC; buf[4] = no_secs & 0xFF; buf[3] = (no_secs >> 8) & 0xFF; buf[2] = no_mins & 0xFF; buf[1] = (no_mins >> 8) & 0xFF; buf[0] = (no_mins >> 16) & 0xFF; for (i = 0; i < ARRAY_SIZE(ab8500_rtc_time_regs); i++) { retval = abx500_set_register_interruptible(dev, AB8500_RTC, ab8500_rtc_time_regs[i], buf[i]); if (retval < 0) return retval; } /* Request a data write */ return abx500_set_register_interruptible(dev, AB8500_RTC, AB8500_RTC_READ_REQ_REG, RTC_WRITE_REQUEST); } static int ab8500_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) { int retval, i; u8 rtc_ctrl, value; unsigned char buf[ARRAY_SIZE(ab8500_rtc_alarm_regs)]; unsigned long secs, mins; /* Check if the alarm is enabled or not */ retval = abx500_get_register_interruptible(dev, AB8500_RTC, AB8500_RTC_STAT_REG, &rtc_ctrl); if (retval < 0) return retval; if (rtc_ctrl & RTC_ALARM_ENA) alarm->enabled = 1; else alarm->enabled = 0; alarm->pending = 0; for (i = 0; i < ARRAY_SIZE(ab8500_rtc_alarm_regs); i++) { retval = abx500_get_register_interruptible(dev, AB8500_RTC, ab8500_rtc_alarm_regs[i], &value); if (retval < 0) return retval; buf[i] = value; } mins = (buf[0] << 16) | (buf[1] << 8) | (buf[2]); secs = mins * 60; rtc_time64_to_tm(secs, &alarm->time); return 0; } static int ab8500_rtc_irq_enable(struct device *dev, unsigned int enabled) { return abx500_mask_and_set_register_interruptible(dev, AB8500_RTC, AB8500_RTC_STAT_REG, RTC_ALARM_ENA, enabled ? RTC_ALARM_ENA : 0); } static int ab8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) { int retval, i; unsigned char buf[ARRAY_SIZE(ab8500_rtc_alarm_regs)]; unsigned long mins, secs = 0, cursec = 0; struct rtc_time curtm; /* Get the number of seconds since 1970 */ secs = rtc_tm_to_time64(&alarm->time); /* * Check whether alarm is set less than 1min. * Since our RTC doesn't support alarm resolution less than 1min, * return -EINVAL, so UIE EMUL can take it up, incase of UIE_ON */ ab8500_rtc_read_time(dev, &curtm); /* Read current time */ cursec = rtc_tm_to_time64(&curtm); if ((secs - cursec) < 59) { dev_dbg(dev, "Alarm less than 1 minute not supported\r\n"); return -EINVAL; } mins = secs / 60; buf[2] = mins & 0xFF; buf[1] = (mins >> 8) & 0xFF; buf[0] = (mins >> 16) & 0xFF; /* Set the alarm time */ for (i = 0; i < ARRAY_SIZE(ab8500_rtc_alarm_regs); i++) { retval = abx500_set_register_interruptible(dev, AB8500_RTC, ab8500_rtc_alarm_regs[i], buf[i]); if (retval < 0) return retval; } return ab8500_rtc_irq_enable(dev, alarm->enabled); } static int ab8500_rtc_set_calibration(struct device *dev, int calibration) { int retval; u8 rtccal = 0; /* * Check that the calibration value (which is in units of 0.5 * parts-per-million) is in the AB8500's range for RtcCalibration * register. -128 (0x80) is not permitted because the AB8500 uses * a sign-bit rather than two's complement, so 0x80 is just another * representation of zero. */ if ((calibration < -127) || (calibration > 127)) { dev_err(dev, "RtcCalibration value outside permitted range\n"); return -EINVAL; } /* * The AB8500 uses sign (in bit7) and magnitude (in bits0-7) * so need to convert to this sort of representation before writing * into RtcCalibration register... */ if (calibration >= 0) rtccal = 0x7F & calibration; else rtccal = ~(calibration - 1) | 0x80; retval = abx500_set_register_interruptible(dev, AB8500_RTC, AB8500_RTC_CALIB_REG, rtccal); return retval; } static int ab8500_rtc_get_calibration(struct device *dev, int *calibration) { int retval; u8 rtccal = 0; retval = abx500_get_register_interruptible(dev, AB8500_RTC, AB8500_RTC_CALIB_REG, &rtccal); if (retval >= 0) { /* * The AB8500 uses sign (in bit7) and magnitude (in bits0-7) * so need to convert value from RtcCalibration register into * a two's complement signed value... */ if (rtccal & 0x80) *calibration = 0 - (rtccal & 0x7F); else *calibration = 0x7F & rtccal; } return retval; } static ssize_t ab8500_sysfs_store_rtc_calibration(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int retval; int calibration = 0; if (sscanf(buf, " %i ", &calibration) != 1) { dev_err(dev, "Failed to store RTC calibration attribute\n"); return -EINVAL; } retval = ab8500_rtc_set_calibration(dev, calibration); return retval ? retval : count; } static ssize_t ab8500_sysfs_show_rtc_calibration(struct device *dev, struct device_attribute *attr, char *buf) { int retval = 0; int calibration = 0; retval = ab8500_rtc_get_calibration(dev, &calibration); if (retval < 0) { dev_err(dev, "Failed to read RTC calibration attribute\n"); sprintf(buf, "0\n"); return retval; } return sprintf(buf, "%d\n", calibration); } static DEVICE_ATTR(rtc_calibration, S_IRUGO | S_IWUSR, ab8500_sysfs_show_rtc_calibration, ab8500_sysfs_store_rtc_calibration); static struct attribute *ab8500_rtc_attrs[] = { &dev_attr_rtc_calibration.attr, NULL }; static const struct attribute_group ab8500_rtc_sysfs_files = { .attrs = ab8500_rtc_attrs, }; static irqreturn_t rtc_alarm_handler(int irq, void *data) { struct rtc_device *rtc = data; unsigned long events = RTC_IRQF | RTC_AF; dev_dbg(&rtc->dev, "%s\n", __func__); rtc_update_irq(rtc, 1, events); return IRQ_HANDLED; } static const struct rtc_class_ops ab8500_rtc_ops = { .read_time = ab8500_rtc_read_time, .set_time = ab8500_rtc_set_time, .read_alarm = ab8500_rtc_read_alarm, .set_alarm = ab8500_rtc_set_alarm, .alarm_irq_enable = ab8500_rtc_irq_enable, }; static const struct platform_device_id ab85xx_rtc_ids[] = { { "ab8500-rtc", (kernel_ulong_t)&ab8500_rtc_ops, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(platform, ab85xx_rtc_ids); static int ab8500_rtc_probe(struct platform_device *pdev) { const struct platform_device_id *platid = platform_get_device_id(pdev); int err; struct rtc_device *rtc; u8 rtc_ctrl; int irq; irq = platform_get_irq_byname(pdev, "ALARM"); if (irq < 0) return irq; /* For RTC supply test */ err = abx500_mask_and_set_register_interruptible(&pdev->dev, AB8500_RTC, AB8500_RTC_STAT_REG, RTC_STATUS_DATA, RTC_STATUS_DATA); if (err < 0) return err; /* Wait for reset by the PorRtc */ usleep_range(1000, 5000); err = abx500_get_register_interruptible(&pdev->dev, AB8500_RTC, AB8500_RTC_STAT_REG, &rtc_ctrl); if (err < 0) return err; /* Check if the RTC Supply fails */ if (!(rtc_ctrl & RTC_STATUS_DATA)) { dev_err(&pdev->dev, "RTC supply failure\n"); return -ENODEV; } device_init_wakeup(&pdev->dev, true); rtc = devm_rtc_allocate_device(&pdev->dev); if (IS_ERR(rtc)) return PTR_ERR(rtc); rtc->ops = (struct rtc_class_ops *)platid->driver_data; err = devm_request_threaded_irq(&pdev->dev, irq, NULL, rtc_alarm_handler, IRQF_ONESHOT, "ab8500-rtc", rtc); if (err < 0) return err; dev_pm_set_wake_irq(&pdev->dev, irq); platform_set_drvdata(pdev, rtc); rtc->uie_unsupported = 1; rtc->range_max = (1ULL << 24) * 60 - 1; // 24-bit minutes + 59 secs rtc->start_secs = RTC_TIMESTAMP_BEGIN_2000; rtc->set_start_time = true; err = rtc_add_group(rtc, &ab8500_rtc_sysfs_files); if (err) return err; return rtc_register_device(rtc); } static int ab8500_rtc_remove(struct platform_device *pdev) { dev_pm_clear_wake_irq(&pdev->dev); device_init_wakeup(&pdev->dev, false); return 0; } static struct platform_driver ab8500_rtc_driver = { .driver = { .name = "ab8500-rtc", }, .probe = ab8500_rtc_probe, .remove = ab8500_rtc_remove, .id_table = ab85xx_rtc_ids, }; module_platform_driver(ab8500_rtc_driver); MODULE_AUTHOR("Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>"); MODULE_DESCRIPTION("AB8500 RTC Driver"); MODULE_LICENSE("GPL v2");
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