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327 lines
7.7 KiB
327 lines
7.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* rtc-tps6586x.c: RTC driver for TI PMIC TPS6586X |
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* |
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* Copyright (c) 2012, NVIDIA Corporation. |
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* |
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* Author: Laxman Dewangan <[email protected]> |
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*/ |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/irq.h> |
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#include <linux/kernel.h> |
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#include <linux/mfd/tps6586x.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/rtc.h> |
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#include <linux/slab.h> |
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#define RTC_CTRL 0xc0 |
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#define POR_RESET_N BIT(7) |
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#define OSC_SRC_SEL BIT(6) |
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#define RTC_ENABLE BIT(5) /* enables alarm */ |
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#define RTC_BUF_ENABLE BIT(4) /* 32 KHz buffer enable */ |
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#define PRE_BYPASS BIT(3) /* 0=1KHz or 1=32KHz updates */ |
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#define CL_SEL_MASK (BIT(2)|BIT(1)) |
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#define CL_SEL_POS 1 |
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#define RTC_ALARM1_HI 0xc1 |
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#define RTC_COUNT4 0xc6 |
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/* start a PMU RTC access by reading the register prior to the RTC_COUNT4 */ |
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#define RTC_COUNT4_DUMMYREAD 0xc5 |
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/*only 14-bits width in second*/ |
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#define ALM1_VALID_RANGE_IN_SEC 0x3FFF |
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#define TPS6586X_RTC_CL_SEL_1_5PF 0x0 |
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#define TPS6586X_RTC_CL_SEL_6_5PF 0x1 |
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#define TPS6586X_RTC_CL_SEL_7_5PF 0x2 |
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#define TPS6586X_RTC_CL_SEL_12_5PF 0x3 |
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struct tps6586x_rtc { |
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struct device *dev; |
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struct rtc_device *rtc; |
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int irq; |
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bool irq_en; |
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}; |
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static inline struct device *to_tps6586x_dev(struct device *dev) |
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{ |
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return dev->parent; |
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} |
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static int tps6586x_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct device *tps_dev = to_tps6586x_dev(dev); |
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unsigned long long ticks = 0; |
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time64_t seconds; |
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u8 buff[6]; |
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int ret; |
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int i; |
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ret = tps6586x_reads(tps_dev, RTC_COUNT4_DUMMYREAD, sizeof(buff), buff); |
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if (ret < 0) { |
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dev_err(dev, "read counter failed with err %d\n", ret); |
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return ret; |
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} |
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for (i = 1; i < sizeof(buff); i++) { |
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ticks <<= 8; |
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ticks |= buff[i]; |
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} |
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seconds = ticks >> 10; |
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rtc_time64_to_tm(seconds, tm); |
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return 0; |
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} |
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static int tps6586x_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct device *tps_dev = to_tps6586x_dev(dev); |
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unsigned long long ticks; |
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time64_t seconds; |
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u8 buff[5]; |
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int ret; |
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seconds = rtc_tm_to_time64(tm); |
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ticks = (unsigned long long)seconds << 10; |
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buff[0] = (ticks >> 32) & 0xff; |
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buff[1] = (ticks >> 24) & 0xff; |
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buff[2] = (ticks >> 16) & 0xff; |
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buff[3] = (ticks >> 8) & 0xff; |
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buff[4] = ticks & 0xff; |
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/* Disable RTC before changing time */ |
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ret = tps6586x_clr_bits(tps_dev, RTC_CTRL, RTC_ENABLE); |
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if (ret < 0) { |
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dev_err(dev, "failed to clear RTC_ENABLE\n"); |
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return ret; |
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} |
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ret = tps6586x_writes(tps_dev, RTC_COUNT4, sizeof(buff), buff); |
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if (ret < 0) { |
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dev_err(dev, "failed to program new time\n"); |
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return ret; |
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} |
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/* Enable RTC */ |
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ret = tps6586x_set_bits(tps_dev, RTC_CTRL, RTC_ENABLE); |
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if (ret < 0) { |
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dev_err(dev, "failed to set RTC_ENABLE\n"); |
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return ret; |
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} |
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return 0; |
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} |
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static int tps6586x_rtc_alarm_irq_enable(struct device *dev, |
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unsigned int enabled) |
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{ |
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struct tps6586x_rtc *rtc = dev_get_drvdata(dev); |
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if (enabled && !rtc->irq_en) { |
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enable_irq(rtc->irq); |
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rtc->irq_en = true; |
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} else if (!enabled && rtc->irq_en) { |
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disable_irq(rtc->irq); |
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rtc->irq_en = false; |
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} |
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return 0; |
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} |
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static int tps6586x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct device *tps_dev = to_tps6586x_dev(dev); |
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time64_t seconds; |
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unsigned long ticks; |
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unsigned long rtc_current_time; |
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unsigned long long rticks = 0; |
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u8 buff[3]; |
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u8 rbuff[6]; |
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int ret; |
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int i; |
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seconds = rtc_tm_to_time64(&alrm->time); |
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ret = tps6586x_rtc_alarm_irq_enable(dev, alrm->enabled); |
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if (ret < 0) { |
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dev_err(dev, "can't set alarm irq, err %d\n", ret); |
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return ret; |
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} |
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ret = tps6586x_reads(tps_dev, RTC_COUNT4_DUMMYREAD, |
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sizeof(rbuff), rbuff); |
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if (ret < 0) { |
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dev_err(dev, "read counter failed with err %d\n", ret); |
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return ret; |
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} |
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for (i = 1; i < sizeof(rbuff); i++) { |
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rticks <<= 8; |
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rticks |= rbuff[i]; |
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} |
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rtc_current_time = rticks >> 10; |
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if ((seconds - rtc_current_time) > ALM1_VALID_RANGE_IN_SEC) |
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seconds = rtc_current_time - 1; |
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ticks = (unsigned long long)seconds << 10; |
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buff[0] = (ticks >> 16) & 0xff; |
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buff[1] = (ticks >> 8) & 0xff; |
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buff[2] = ticks & 0xff; |
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ret = tps6586x_writes(tps_dev, RTC_ALARM1_HI, sizeof(buff), buff); |
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if (ret) |
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dev_err(dev, "programming alarm failed with err %d\n", ret); |
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return ret; |
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} |
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static int tps6586x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
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{ |
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struct device *tps_dev = to_tps6586x_dev(dev); |
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unsigned long ticks; |
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time64_t seconds; |
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u8 buff[3]; |
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int ret; |
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ret = tps6586x_reads(tps_dev, RTC_ALARM1_HI, sizeof(buff), buff); |
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if (ret) { |
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dev_err(dev, "read RTC_ALARM1_HI failed with err %d\n", ret); |
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return ret; |
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} |
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ticks = (buff[0] << 16) | (buff[1] << 8) | buff[2]; |
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seconds = ticks >> 10; |
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rtc_time64_to_tm(seconds, &alrm->time); |
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return 0; |
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} |
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static const struct rtc_class_ops tps6586x_rtc_ops = { |
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.read_time = tps6586x_rtc_read_time, |
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.set_time = tps6586x_rtc_set_time, |
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.set_alarm = tps6586x_rtc_set_alarm, |
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.read_alarm = tps6586x_rtc_read_alarm, |
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.alarm_irq_enable = tps6586x_rtc_alarm_irq_enable, |
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}; |
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static irqreturn_t tps6586x_rtc_irq(int irq, void *data) |
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{ |
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struct tps6586x_rtc *rtc = data; |
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rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); |
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return IRQ_HANDLED; |
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} |
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static int tps6586x_rtc_probe(struct platform_device *pdev) |
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{ |
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struct device *tps_dev = to_tps6586x_dev(&pdev->dev); |
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struct tps6586x_rtc *rtc; |
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int ret; |
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rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); |
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if (!rtc) |
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return -ENOMEM; |
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rtc->dev = &pdev->dev; |
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rtc->irq = platform_get_irq(pdev, 0); |
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/* 1 kHz tick mode, enable tick counting */ |
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ret = tps6586x_update(tps_dev, RTC_CTRL, |
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RTC_ENABLE | OSC_SRC_SEL | |
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((TPS6586X_RTC_CL_SEL_1_5PF << CL_SEL_POS) & CL_SEL_MASK), |
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RTC_ENABLE | OSC_SRC_SEL | PRE_BYPASS | CL_SEL_MASK); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "unable to start counter\n"); |
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return ret; |
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} |
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device_init_wakeup(&pdev->dev, 1); |
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platform_set_drvdata(pdev, rtc); |
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rtc->rtc = devm_rtc_allocate_device(&pdev->dev); |
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if (IS_ERR(rtc->rtc)) { |
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ret = PTR_ERR(rtc->rtc); |
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goto fail_rtc_register; |
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} |
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rtc->rtc->ops = &tps6586x_rtc_ops; |
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rtc->rtc->range_max = (1ULL << 30) - 1; /* 30-bit seconds */ |
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rtc->rtc->start_secs = mktime64(2009, 1, 1, 0, 0, 0); |
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rtc->rtc->set_start_time = true; |
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irq_set_status_flags(rtc->irq, IRQ_NOAUTOEN); |
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ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL, |
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tps6586x_rtc_irq, |
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IRQF_ONESHOT, |
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dev_name(&pdev->dev), rtc); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "request IRQ(%d) failed with ret %d\n", |
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rtc->irq, ret); |
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goto fail_rtc_register; |
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} |
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ret = devm_rtc_register_device(rtc->rtc); |
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if (ret) |
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goto fail_rtc_register; |
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return 0; |
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fail_rtc_register: |
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tps6586x_update(tps_dev, RTC_CTRL, 0, |
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RTC_ENABLE | OSC_SRC_SEL | PRE_BYPASS | CL_SEL_MASK); |
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return ret; |
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}; |
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static int tps6586x_rtc_remove(struct platform_device *pdev) |
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{ |
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struct device *tps_dev = to_tps6586x_dev(&pdev->dev); |
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tps6586x_update(tps_dev, RTC_CTRL, 0, |
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RTC_ENABLE | OSC_SRC_SEL | PRE_BYPASS | CL_SEL_MASK); |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int tps6586x_rtc_suspend(struct device *dev) |
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{ |
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struct tps6586x_rtc *rtc = dev_get_drvdata(dev); |
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if (device_may_wakeup(dev)) |
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enable_irq_wake(rtc->irq); |
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return 0; |
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} |
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static int tps6586x_rtc_resume(struct device *dev) |
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{ |
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struct tps6586x_rtc *rtc = dev_get_drvdata(dev); |
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if (device_may_wakeup(dev)) |
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disable_irq_wake(rtc->irq); |
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return 0; |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(tps6586x_pm_ops, tps6586x_rtc_suspend, |
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tps6586x_rtc_resume); |
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static struct platform_driver tps6586x_rtc_driver = { |
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.driver = { |
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.name = "tps6586x-rtc", |
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.pm = &tps6586x_pm_ops, |
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}, |
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.probe = tps6586x_rtc_probe, |
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.remove = tps6586x_rtc_remove, |
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}; |
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module_platform_driver(tps6586x_rtc_driver); |
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MODULE_ALIAS("platform:tps6586x-rtc"); |
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MODULE_DESCRIPTION("TI TPS6586x RTC driver"); |
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MODULE_AUTHOR("Laxman dewangan <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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