mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-14 05:56:56 +07:00
0288d2e326
Add of_device_id table for Palma RTC to be enable the driver from DT file. The driver can be registered from DT file as: palmas: tps65913@58 { ::::::::::: palmas_rtc { compatible = "ti,palmas-rtc"; interrupt-parent = <&palmas>; interrupts = <8 0>; }; }; Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
345 lines
9.3 KiB
C
345 lines
9.3 KiB
C
/*
|
|
* rtc-palmas.c -- Palmas Real Time Clock driver.
|
|
|
|
* RTC driver for TI Palma series devices like TPS65913,
|
|
* TPS65914 power management IC.
|
|
*
|
|
* 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/bcd.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mfd/palmas.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/types.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pm.h>
|
|
|
|
struct palmas_rtc {
|
|
struct rtc_device *rtc;
|
|
struct device *dev;
|
|
unsigned int irq;
|
|
};
|
|
|
|
/* Total number of RTC registers needed to set time*/
|
|
#define PALMAS_NUM_TIME_REGS (PALMAS_YEARS_REG - PALMAS_SECONDS_REG + 1)
|
|
|
|
static int palmas_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
unsigned char rtc_data[PALMAS_NUM_TIME_REGS];
|
|
struct palmas *palmas = dev_get_drvdata(dev->parent);
|
|
int ret;
|
|
|
|
/* Copy RTC counting registers to static registers or latches */
|
|
ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,
|
|
PALMAS_RTC_CTRL_REG_GET_TIME, PALMAS_RTC_CTRL_REG_GET_TIME);
|
|
if (ret < 0) {
|
|
dev_err(dev, "RTC CTRL reg update failed, err: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = palmas_bulk_read(palmas, PALMAS_RTC_BASE, PALMAS_SECONDS_REG,
|
|
rtc_data, PALMAS_NUM_TIME_REGS);
|
|
if (ret < 0) {
|
|
dev_err(dev, "RTC_SECONDS reg read failed, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
tm->tm_sec = bcd2bin(rtc_data[0]);
|
|
tm->tm_min = bcd2bin(rtc_data[1]);
|
|
tm->tm_hour = bcd2bin(rtc_data[2]);
|
|
tm->tm_mday = bcd2bin(rtc_data[3]);
|
|
tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
|
|
tm->tm_year = bcd2bin(rtc_data[5]) + 100;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int palmas_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
unsigned char rtc_data[PALMAS_NUM_TIME_REGS];
|
|
struct palmas *palmas = dev_get_drvdata(dev->parent);
|
|
int ret;
|
|
|
|
rtc_data[0] = bin2bcd(tm->tm_sec);
|
|
rtc_data[1] = bin2bcd(tm->tm_min);
|
|
rtc_data[2] = bin2bcd(tm->tm_hour);
|
|
rtc_data[3] = bin2bcd(tm->tm_mday);
|
|
rtc_data[4] = bin2bcd(tm->tm_mon + 1);
|
|
rtc_data[5] = bin2bcd(tm->tm_year - 100);
|
|
|
|
/* Stop RTC while updating the RTC time registers */
|
|
ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,
|
|
PALMAS_RTC_CTRL_REG_STOP_RTC, 0);
|
|
if (ret < 0) {
|
|
dev_err(dev, "RTC stop failed, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = palmas_bulk_write(palmas, PALMAS_RTC_BASE, PALMAS_SECONDS_REG,
|
|
rtc_data, PALMAS_NUM_TIME_REGS);
|
|
if (ret < 0) {
|
|
dev_err(dev, "RTC_SECONDS reg write failed, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* Start back RTC */
|
|
ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,
|
|
PALMAS_RTC_CTRL_REG_STOP_RTC, PALMAS_RTC_CTRL_REG_STOP_RTC);
|
|
if (ret < 0)
|
|
dev_err(dev, "RTC start failed, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
static int palmas_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
|
|
{
|
|
struct palmas *palmas = dev_get_drvdata(dev->parent);
|
|
u8 val;
|
|
|
|
val = enabled ? PALMAS_RTC_INTERRUPTS_REG_IT_ALARM : 0;
|
|
return palmas_write(palmas, PALMAS_RTC_BASE,
|
|
PALMAS_RTC_INTERRUPTS_REG, val);
|
|
}
|
|
|
|
static int palmas_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
|
|
{
|
|
unsigned char alarm_data[PALMAS_NUM_TIME_REGS];
|
|
u32 int_val;
|
|
struct palmas *palmas = dev_get_drvdata(dev->parent);
|
|
int ret;
|
|
|
|
ret = palmas_bulk_read(palmas, PALMAS_RTC_BASE,
|
|
PALMAS_ALARM_SECONDS_REG,
|
|
alarm_data, PALMAS_NUM_TIME_REGS);
|
|
if (ret < 0) {
|
|
dev_err(dev, "RTC_ALARM_SECONDS read failed, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
alm->time.tm_sec = bcd2bin(alarm_data[0]);
|
|
alm->time.tm_min = bcd2bin(alarm_data[1]);
|
|
alm->time.tm_hour = bcd2bin(alarm_data[2]);
|
|
alm->time.tm_mday = bcd2bin(alarm_data[3]);
|
|
alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1;
|
|
alm->time.tm_year = bcd2bin(alarm_data[5]) + 100;
|
|
|
|
ret = palmas_read(palmas, PALMAS_RTC_BASE, PALMAS_RTC_INTERRUPTS_REG,
|
|
&int_val);
|
|
if (ret < 0) {
|
|
dev_err(dev, "RTC_INTERRUPTS reg read failed, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
if (int_val & PALMAS_RTC_INTERRUPTS_REG_IT_ALARM)
|
|
alm->enabled = 1;
|
|
return ret;
|
|
}
|
|
|
|
static int palmas_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
|
|
{
|
|
unsigned char alarm_data[PALMAS_NUM_TIME_REGS];
|
|
struct palmas *palmas = dev_get_drvdata(dev->parent);
|
|
int ret;
|
|
|
|
ret = palmas_rtc_alarm_irq_enable(dev, 0);
|
|
if (ret < 0) {
|
|
dev_err(dev, "Disable RTC alarm failed\n");
|
|
return ret;
|
|
}
|
|
|
|
alarm_data[0] = bin2bcd(alm->time.tm_sec);
|
|
alarm_data[1] = bin2bcd(alm->time.tm_min);
|
|
alarm_data[2] = bin2bcd(alm->time.tm_hour);
|
|
alarm_data[3] = bin2bcd(alm->time.tm_mday);
|
|
alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
|
|
alarm_data[5] = bin2bcd(alm->time.tm_year - 100);
|
|
|
|
ret = palmas_bulk_write(palmas, PALMAS_RTC_BASE,
|
|
PALMAS_ALARM_SECONDS_REG, alarm_data, PALMAS_NUM_TIME_REGS);
|
|
if (ret < 0) {
|
|
dev_err(dev, "ALARM_SECONDS_REG write failed, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
if (alm->enabled)
|
|
ret = palmas_rtc_alarm_irq_enable(dev, 1);
|
|
return ret;
|
|
}
|
|
|
|
static int palmas_clear_interrupts(struct device *dev)
|
|
{
|
|
struct palmas *palmas = dev_get_drvdata(dev->parent);
|
|
unsigned int rtc_reg;
|
|
int ret;
|
|
|
|
ret = palmas_read(palmas, PALMAS_RTC_BASE, PALMAS_RTC_STATUS_REG,
|
|
&rtc_reg);
|
|
if (ret < 0) {
|
|
dev_err(dev, "RTC_STATUS read failed, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = palmas_write(palmas, PALMAS_RTC_BASE, PALMAS_RTC_STATUS_REG,
|
|
rtc_reg);
|
|
if (ret < 0) {
|
|
dev_err(dev, "RTC_STATUS write failed, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t palmas_rtc_interrupt(int irq, void *context)
|
|
{
|
|
struct palmas_rtc *palmas_rtc = context;
|
|
struct device *dev = palmas_rtc->dev;
|
|
int ret;
|
|
|
|
ret = palmas_clear_interrupts(dev);
|
|
if (ret < 0) {
|
|
dev_err(dev, "RTC interrupt clear failed, err = %d\n", ret);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
rtc_update_irq(palmas_rtc->rtc, 1, RTC_IRQF | RTC_AF);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct rtc_class_ops palmas_rtc_ops = {
|
|
.read_time = palmas_rtc_read_time,
|
|
.set_time = palmas_rtc_set_time,
|
|
.read_alarm = palmas_rtc_read_alarm,
|
|
.set_alarm = palmas_rtc_set_alarm,
|
|
.alarm_irq_enable = palmas_rtc_alarm_irq_enable,
|
|
};
|
|
|
|
static int palmas_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
|
|
struct palmas_rtc *palmas_rtc = NULL;
|
|
int ret;
|
|
|
|
palmas_rtc = devm_kzalloc(&pdev->dev, sizeof(struct palmas_rtc),
|
|
GFP_KERNEL);
|
|
if (!palmas_rtc)
|
|
return -ENOMEM;
|
|
|
|
/* Clear pending interrupts */
|
|
ret = palmas_clear_interrupts(&pdev->dev);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "clear RTC int failed, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
palmas_rtc->dev = &pdev->dev;
|
|
platform_set_drvdata(pdev, palmas_rtc);
|
|
|
|
/* Start RTC */
|
|
ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG,
|
|
PALMAS_RTC_CTRL_REG_STOP_RTC,
|
|
PALMAS_RTC_CTRL_REG_STOP_RTC);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "RTC_CTRL write failed, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
palmas_rtc->irq = platform_get_irq(pdev, 0);
|
|
|
|
palmas_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
|
|
&palmas_rtc_ops, THIS_MODULE);
|
|
if (IS_ERR(palmas_rtc->rtc)) {
|
|
ret = PTR_ERR(palmas_rtc->rtc);
|
|
dev_err(&pdev->dev, "RTC register failed, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_request_threaded_irq(&pdev->dev, palmas_rtc->irq, NULL,
|
|
palmas_rtc_interrupt,
|
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT |
|
|
IRQF_EARLY_RESUME,
|
|
dev_name(&pdev->dev), palmas_rtc);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "IRQ request failed, err = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
device_set_wakeup_capable(&pdev->dev, 1);
|
|
return 0;
|
|
}
|
|
|
|
static int palmas_rtc_remove(struct platform_device *pdev)
|
|
{
|
|
palmas_rtc_alarm_irq_enable(&pdev->dev, 0);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int palmas_rtc_suspend(struct device *dev)
|
|
{
|
|
struct palmas_rtc *palmas_rtc = dev_get_drvdata(dev);
|
|
|
|
if (device_may_wakeup(dev))
|
|
enable_irq_wake(palmas_rtc->irq);
|
|
return 0;
|
|
}
|
|
|
|
static int palmas_rtc_resume(struct device *dev)
|
|
{
|
|
struct palmas_rtc *palmas_rtc = dev_get_drvdata(dev);
|
|
|
|
if (device_may_wakeup(dev))
|
|
disable_irq_wake(palmas_rtc->irq);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static const struct dev_pm_ops palmas_rtc_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(palmas_rtc_suspend, palmas_rtc_resume)
|
|
};
|
|
|
|
#ifdef CONFIG_OF
|
|
static struct of_device_id of_palmas_rtc_match[] = {
|
|
{ .compatible = "ti,palmas-rtc"},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_palmas_rtc_match);
|
|
#endif
|
|
|
|
static struct platform_driver palmas_rtc_driver = {
|
|
.probe = palmas_rtc_probe,
|
|
.remove = palmas_rtc_remove,
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "palmas-rtc",
|
|
.pm = &palmas_rtc_pm_ops,
|
|
.of_match_table = of_match_ptr(of_palmas_rtc_match),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(palmas_rtc_driver);
|
|
|
|
MODULE_ALIAS("platform:palmas_rtc");
|
|
MODULE_DESCRIPTION("TI PALMAS series RTC driver");
|
|
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
|
|
MODULE_LICENSE("GPL v2");
|