Orange Pi5 kernel

Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards

‎ 3 Commits   0 Branches   0 Tags   |
Index
Trunk
Branches
Tags
Trunk
Branches
Tags
Home page
Home page
orangepi/linux-orangepi-5.10.y.git/trunk/drivers/rtc/rtc-tps6586x.c
log
diff
blame
/*
 * rtc-tps6586x.c: RTC driver for TI PMIC TPS6586X
 *
 * Copyright (c) 2012, NVIDIA Corporation.
 *
 * Author: Laxman Dewangan <ldewangan@nvidia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
 * whether express or implied; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307, USA
 */
 
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/mfd/tps6586x.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/rtc.h>
#include <linux/slab.h>
 
#define RTC_CTRL			0xc0
#define POR_RESET_N			BIT(7)
#define OSC_SRC_SEL			BIT(6)
#define RTC_ENABLE			BIT(5)	/* enables alarm */
#define RTC_BUF_ENABLE			BIT(4)	/* 32 KHz buffer enable */
#define PRE_BYPASS			BIT(3)	/* 0=1KHz or 1=32KHz updates */
#define CL_SEL_MASK			(BIT(2)|BIT(1))
#define CL_SEL_POS			1
#define RTC_ALARM1_HI			0xc1
#define RTC_COUNT4			0xc6
 
/* start a PMU RTC access by reading the register prior to the RTC_COUNT4 */
#define RTC_COUNT4_DUMMYREAD		0xc5
 
/*only 14-bits width in second*/
#define ALM1_VALID_RANGE_IN_SEC		0x3FFF
 
#define TPS6586X_RTC_CL_SEL_1_5PF	0x0
#define TPS6586X_RTC_CL_SEL_6_5PF	0x1
#define TPS6586X_RTC_CL_SEL_7_5PF	0x2
#define TPS6586X_RTC_CL_SEL_12_5PF	0x3
 
struct tps6586x_rtc {
<------>struct device		*dev;
<------>struct rtc_device	*rtc;
<------>int			irq;
<------>bool			irq_en;
};
 
static inline struct device *to_tps6586x_dev(struct device *dev)
{
<------>return dev->parent;
}
 
static int tps6586x_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
<------>struct device *tps_dev = to_tps6586x_dev(dev);
<------>unsigned long long ticks = 0;
<------>time64_t seconds;
<------>u8 buff[6];
<------>int ret;
<------>int i;
 
<------>ret = tps6586x_reads(tps_dev, RTC_COUNT4_DUMMYREAD, sizeof(buff), buff);
<------>if (ret < 0) {
<------><------>dev_err(dev, "read counter failed with err %d\n", ret);
<------><------>return ret;
<------>}
 
<------>for (i = 1; i < sizeof(buff); i++) {
<------><------>ticks <<= 8;
<------><------>ticks |= buff[i];
<------>}
 
<------>seconds = ticks >> 10;
<------>rtc_time64_to_tm(seconds, tm);
 
<------>return 0;
}
 
static int tps6586x_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
<------>struct device *tps_dev = to_tps6586x_dev(dev);
<------>unsigned long long ticks;
<------>time64_t seconds;
<------>u8 buff[5];
<------>int ret;
 
<------>seconds = rtc_tm_to_time64(tm);
 
<------>ticks = (unsigned long long)seconds << 10;
<------>buff[0] = (ticks >> 32) & 0xff;
<------>buff[1] = (ticks >> 24) & 0xff;
<------>buff[2] = (ticks >> 16) & 0xff;
<------>buff[3] = (ticks >> 8) & 0xff;
<------>buff[4] = ticks & 0xff;
 
<------>/* Disable RTC before changing time */
<------>ret = tps6586x_clr_bits(tps_dev, RTC_CTRL, RTC_ENABLE);
<------>if (ret < 0) {
<------><------>dev_err(dev, "failed to clear RTC_ENABLE\n");
<------><------>return ret;
<------>}
 
<------>ret = tps6586x_writes(tps_dev, RTC_COUNT4, sizeof(buff), buff);
<------>if (ret < 0) {
<------><------>dev_err(dev, "failed to program new time\n");
<------><------>return ret;
<------>}
 
<------>/* Enable RTC */
<------>ret = tps6586x_set_bits(tps_dev, RTC_CTRL, RTC_ENABLE);
<------>if (ret < 0) {
<------><------>dev_err(dev, "failed to set RTC_ENABLE\n");
<------><------>return ret;
<------>}
<------>return 0;
}
 
static int tps6586x_rtc_alarm_irq_enable(struct device *dev,
<------><------><------> unsigned int enabled)
{
<------>struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
 
<------>if (enabled && !rtc->irq_en) {
<------><------>enable_irq(rtc->irq);
<------><------>rtc->irq_en = true;
<------>} else if (!enabled && rtc->irq_en)  {
<------><------>disable_irq(rtc->irq);
<------><------>rtc->irq_en = false;
<------>}
<------>return 0;
}
 
static int tps6586x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
<------>struct device *tps_dev = to_tps6586x_dev(dev);
<------>time64_t seconds;
<------>unsigned long ticks;
<------>unsigned long rtc_current_time;
<------>unsigned long long rticks = 0;
<------>u8 buff[3];
<------>u8 rbuff[6];
<------>int ret;
<------>int i;
 
<------>seconds = rtc_tm_to_time64(&alrm->time);
 
<------>ret = tps6586x_rtc_alarm_irq_enable(dev, alrm->enabled);
<------>if (ret < 0) {
<------><------>dev_err(dev, "can't set alarm irq, err %d\n", ret);
<------><------>return ret;
<------>}
 
<------>ret = tps6586x_reads(tps_dev, RTC_COUNT4_DUMMYREAD,
<------><------><------>sizeof(rbuff), rbuff);
<------>if (ret < 0) {
<------><------>dev_err(dev, "read counter failed with err %d\n", ret);
<------><------>return ret;
<------>}
 
<------>for (i = 1; i < sizeof(rbuff); i++) {
<------><------>rticks <<= 8;
<------><------>rticks |= rbuff[i];
<------>}
 
<------>rtc_current_time = rticks >> 10;
<------>if ((seconds - rtc_current_time) > ALM1_VALID_RANGE_IN_SEC)
<------><------>seconds = rtc_current_time - 1;
 
<------>ticks = (unsigned long long)seconds << 10;
<------>buff[0] = (ticks >> 16) & 0xff;
<------>buff[1] = (ticks >> 8) & 0xff;
<------>buff[2] = ticks & 0xff;
 
<------>ret = tps6586x_writes(tps_dev, RTC_ALARM1_HI, sizeof(buff), buff);
<------>if (ret)
<------><------>dev_err(dev, "programming alarm failed with err %d\n", ret);
 
<------>return ret;
}
 
static int tps6586x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
<------>struct device *tps_dev = to_tps6586x_dev(dev);
<------>unsigned long ticks;
<------>time64_t seconds;
<------>u8 buff[3];
<------>int ret;
 
<------>ret = tps6586x_reads(tps_dev, RTC_ALARM1_HI, sizeof(buff), buff);
<------>if (ret) {
<------><------>dev_err(dev, "read RTC_ALARM1_HI failed with err %d\n", ret);
<------><------>return ret;
<------>}
 
<------>ticks = (buff[0] << 16) | (buff[1] << 8) | buff[2];
<------>seconds = ticks >> 10;
 
<------>rtc_time64_to_tm(seconds, &alrm->time);
<------>return 0;
}
 
static const struct rtc_class_ops tps6586x_rtc_ops = {
<------>.read_time	= tps6586x_rtc_read_time,
<------>.set_time	= tps6586x_rtc_set_time,
<------>.set_alarm	= tps6586x_rtc_set_alarm,
<------>.read_alarm	= tps6586x_rtc_read_alarm,
<------>.alarm_irq_enable = tps6586x_rtc_alarm_irq_enable,
};
 
static irqreturn_t tps6586x_rtc_irq(int irq, void *data)
{
<------>struct tps6586x_rtc *rtc = data;
 
<------>rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
<------>return IRQ_HANDLED;
}
 
static int tps6586x_rtc_probe(struct platform_device *pdev)
{
<------>struct device *tps_dev = to_tps6586x_dev(&pdev->dev);
<------>struct tps6586x_rtc *rtc;
<------>int ret;
 
<------>rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
<------>if (!rtc)
<------><------>return -ENOMEM;
 
<------>rtc->dev = &pdev->dev;
<------>rtc->irq = platform_get_irq(pdev, 0);
 
<------>/* 1 kHz tick mode, enable tick counting */
<------>ret = tps6586x_update(tps_dev, RTC_CTRL,
<------><------>RTC_ENABLE | OSC_SRC_SEL |
<------><------>((TPS6586X_RTC_CL_SEL_1_5PF << CL_SEL_POS) & CL_SEL_MASK),
<------><------>RTC_ENABLE | OSC_SRC_SEL | PRE_BYPASS | CL_SEL_MASK);
<------>if (ret < 0) {
<------><------>dev_err(&pdev->dev, "unable to start counter\n");
<------><------>return ret;
<------>}
 
<------>device_init_wakeup(&pdev->dev, 1);
 
<------>platform_set_drvdata(pdev, rtc);
<------>rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
<------>if (IS_ERR(rtc->rtc)) {
<------><------>ret = PTR_ERR(rtc->rtc);
<------><------>goto fail_rtc_register;
<------>}
 
<------>rtc->rtc->ops = &tps6586x_rtc_ops;
<------>rtc->rtc->range_max = (1ULL << 30) - 1; /* 30-bit seconds */
<------>rtc->rtc->start_secs = mktime64(2009, 1, 1, 0, 0, 0);
<------>rtc->rtc->set_start_time = true;
 
<------>irq_set_status_flags(rtc->irq, IRQ_NOAUTOEN);
 
<------>ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
<------><------><------><------>tps6586x_rtc_irq,
<------><------><------><------>IRQF_ONESHOT,
<------><------><------><------>dev_name(&pdev->dev), rtc);
<------>if (ret < 0) {
<------><------>dev_err(&pdev->dev, "request IRQ(%d) failed with ret %d\n",
<------><------><------><------>rtc->irq, ret);
<------><------>goto fail_rtc_register;
<------>}
 
<------>ret = rtc_register_device(rtc->rtc);
<------>if (ret)
<------><------>goto fail_rtc_register;
 
<------>return 0;
 
fail_rtc_register:
<------>tps6586x_update(tps_dev, RTC_CTRL, 0,
<------><------>RTC_ENABLE | OSC_SRC_SEL | PRE_BYPASS | CL_SEL_MASK);
<------>return ret;
};
 
static int tps6586x_rtc_remove(struct platform_device *pdev)
{
<------>struct device *tps_dev = to_tps6586x_dev(&pdev->dev);
 
<------>tps6586x_update(tps_dev, RTC_CTRL, 0,
<------><------>RTC_ENABLE | OSC_SRC_SEL | PRE_BYPASS | CL_SEL_MASK);
<------>return 0;
}
 
#ifdef CONFIG_PM_SLEEP
static int tps6586x_rtc_suspend(struct device *dev)
{
<------>struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
 
<------>if (device_may_wakeup(dev))
<------><------>enable_irq_wake(rtc->irq);
<------>return 0;
}
 
static int tps6586x_rtc_resume(struct device *dev)
{
<------>struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
 
<------>if (device_may_wakeup(dev))
<------><------>disable_irq_wake(rtc->irq);
<------>return 0;
}
#endif
 
static SIMPLE_DEV_PM_OPS(tps6586x_pm_ops, tps6586x_rtc_suspend,
<------><------><------>tps6586x_rtc_resume);
 
static struct platform_driver tps6586x_rtc_driver = {
<------>.driver	= {
<------><------>.name	= "tps6586x-rtc",
<------><------>.pm	= &tps6586x_pm_ops,
<------>},
<------>.probe	= tps6586x_rtc_probe,
<------>.remove	= tps6586x_rtc_remove,
};
module_platform_driver(tps6586x_rtc_driver);
 
MODULE_ALIAS("platform:tps6586x-rtc");
MODULE_DESCRIPTION("TI TPS6586x RTC driver");
MODULE_AUTHOR("Laxman dewangan <ldewangan@nvidia.com>");
MODULE_LICENSE("GPL v2");
log
diff
blame
cGit-ui™ 0.1.7
Git™ 2.40.0
Nginx™ 1.22.1

Where any material of this site is being reproduced, published or issued to others the reference to the source is obligatory.

© Andrey V. Kosteltsev, 2019 – 2025.