mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 22:36:40 +07:00
180c92c4ae
Let the core handle offsetting and windowing the RTC range. The RTC has a 40-bit counter counting at 1024 Hz. So its maximum value is 2^(40-10) - 1. Also, let the core handle the offset instead of coding it in the callbacks. Keep the default epoch at the beginning of 2009 (this will fail in 2043). Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
342 lines
8.4 KiB
C
342 lines
8.4 KiB
C
/*
|
|
* 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/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);
|
|
dev_err(&pdev->dev, "RTC allocate device: ret %d\n", ret);
|
|
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;
|
|
|
|
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;
|
|
}
|
|
disable_irq(rtc->irq);
|
|
|
|
ret = rtc_register_device(rtc->rtc);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "RTC device register: ret %d\n", 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");
|