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/*
* IBM OPAL RTC driver
* Copyright (C) 2014 IBM
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; 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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#define DRVNAME "rtc-opal"
#include <linux/module.h>
#include <linux/err.h>
#include <linux/rtc.h>
#include <linux/delay.h>
#include <linux/bcd.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <asm/opal.h>
#include <asm/firmware.h>
static void opal_to_tm(u32 y_m_d, u64 h_m_s_ms, struct rtc_time *tm)
{
tm->tm_year = ((bcd2bin(y_m_d >> 24) * 100) +
bcd2bin((y_m_d >> 16) & 0xff)) - 1900;
tm->tm_mon = bcd2bin((y_m_d >> 8) & 0xff) - 1;
tm->tm_mday = bcd2bin(y_m_d & 0xff);
tm->tm_hour = bcd2bin((h_m_s_ms >> 56) & 0xff);
tm->tm_min = bcd2bin((h_m_s_ms >> 48) & 0xff);
tm->tm_sec = bcd2bin((h_m_s_ms >> 40) & 0xff);
GregorianDay(tm);
}
static void tm_to_opal(struct rtc_time *tm, u32 *y_m_d, u64 *h_m_s_ms)
{
*y_m_d |= ((u32)bin2bcd((tm->tm_year + 1900) / 100)) << 24;
*y_m_d |= ((u32)bin2bcd((tm->tm_year + 1900) % 100)) << 16;
*y_m_d |= ((u32)bin2bcd((tm->tm_mon + 1))) << 8;
*y_m_d |= ((u32)bin2bcd(tm->tm_mday));
*h_m_s_ms |= ((u64)bin2bcd(tm->tm_hour)) << 56;
*h_m_s_ms |= ((u64)bin2bcd(tm->tm_min)) << 48;
*h_m_s_ms |= ((u64)bin2bcd(tm->tm_sec)) << 40;
}
static int opal_get_rtc_time(struct device *dev, struct rtc_time *tm)
{
long rc = OPAL_BUSY;
u32 y_m_d;
u64 h_m_s_ms;
__be32 __y_m_d;
__be64 __h_m_s_ms;
while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
rc = opal_rtc_read(&__y_m_d, &__h_m_s_ms);
if (rc == OPAL_BUSY_EVENT)
opal_poll_events(NULL);
else
msleep(10);
}
if (rc != OPAL_SUCCESS)
return -EIO;
y_m_d = be32_to_cpu(__y_m_d);
h_m_s_ms = be64_to_cpu(__h_m_s_ms);
opal_to_tm(y_m_d, h_m_s_ms, tm);
return 0;
}
static int opal_set_rtc_time(struct device *dev, struct rtc_time *tm)
{
long rc = OPAL_BUSY;
u32 y_m_d = 0;
u64 h_m_s_ms = 0;
tm_to_opal(tm, &y_m_d, &h_m_s_ms);
while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
rc = opal_rtc_write(y_m_d, h_m_s_ms);
if (rc == OPAL_BUSY_EVENT)
opal_poll_events(NULL);
else
msleep(10);
}
return rc == OPAL_SUCCESS ? 0 : -EIO;
}
/*
* TPO Timed Power-On
*
* TPO get/set OPAL calls care about the hour and min and to make it consistent
* with the rtc utility time conversion functions, we use the 'u64' to store
* its value and perform bit shift by 32 before use..
*/
static int opal_get_tpo_time(struct device *dev, struct rtc_wkalrm *alarm)
{
__be32 __y_m_d, __h_m;
struct opal_msg msg;
int rc, token;
u64 h_m_s_ms;
u32 y_m_d;
token = opal_async_get_token_interruptible();
if (token < 0) {
if (token != -ERESTARTSYS)
pr_err("Failed to get the async token\n");
return token;
}
rc = opal_tpo_read(token, &__y_m_d, &__h_m);
if (rc != OPAL_ASYNC_COMPLETION) {
rc = -EIO;
goto exit;
}
rc = opal_async_wait_response(token, &msg);
if (rc) {
rc = -EIO;
goto exit;
}
rc = be64_to_cpu(msg.params[1]);
if (rc != OPAL_SUCCESS) {
rc = -EIO;
goto exit;
}
y_m_d = be32_to_cpu(__y_m_d);
h_m_s_ms = ((u64)be32_to_cpu(__h_m) << 32);
opal_to_tm(y_m_d, h_m_s_ms, &alarm->time);
exit:
opal_async_release_token(token);
return rc;
}
/* Set Timed Power-On */
static int opal_set_tpo_time(struct device *dev, struct rtc_wkalrm *alarm)
{
u64 h_m_s_ms = 0, token;
struct opal_msg msg;
u32 y_m_d = 0;
int rc;
tm_to_opal(&alarm->time, &y_m_d, &h_m_s_ms);
token = opal_async_get_token_interruptible();
if (token < 0) {
if (token != -ERESTARTSYS)
pr_err("Failed to get the async token\n");
return token;
}
/* TPO, we care about hour and minute */
rc = opal_tpo_write(token, y_m_d,
(u32)((h_m_s_ms >> 32) & 0xffff0000));
if (rc != OPAL_ASYNC_COMPLETION) {
rc = -EIO;
goto exit;
}
rc = opal_async_wait_response(token, &msg);
if (rc) {
rc = -EIO;
goto exit;
}
rc = be64_to_cpu(msg.params[1]);
if (rc != OPAL_SUCCESS)
rc = -EIO;
exit:
opal_async_release_token(token);
return rc;
}
static const struct rtc_class_ops opal_rtc_ops = {
.read_time = opal_get_rtc_time,
.set_time = opal_set_rtc_time,
.read_alarm = opal_get_tpo_time,
.set_alarm = opal_set_tpo_time,
};
static int opal_rtc_probe(struct platform_device *pdev)
{
struct rtc_device *rtc;
if (pdev->dev.of_node && of_get_property(pdev->dev.of_node, "has-tpo",
NULL))
device_set_wakeup_capable(&pdev->dev, true);
rtc = devm_rtc_device_register(&pdev->dev, DRVNAME, &opal_rtc_ops,
THIS_MODULE);
if (IS_ERR(rtc))
return PTR_ERR(rtc);
rtc->uie_unsupported = 1;
return 0;
}
static const struct of_device_id opal_rtc_match[] = {
{
.compatible = "ibm,opal-rtc",
},
{ }
};
MODULE_DEVICE_TABLE(of, opal_rtc_match);
static const struct platform_device_id opal_rtc_driver_ids[] = {
{
.name = "opal-rtc",
},
{ }
};
MODULE_DEVICE_TABLE(platform, opal_rtc_driver_ids);
static struct platform_driver opal_rtc_driver = {
.probe = opal_rtc_probe,
.id_table = opal_rtc_driver_ids,
.driver = {
.name = DRVNAME,
.owner = THIS_MODULE,
.of_match_table = opal_rtc_match,
},
};
static int __init opal_rtc_init(void)
{
if (!firmware_has_feature(FW_FEATURE_OPAL))
return -ENODEV;
return platform_driver_register(&opal_rtc_driver);
}
static void __exit opal_rtc_exit(void)
{
platform_driver_unregister(&opal_rtc_driver);
}
MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>");
MODULE_DESCRIPTION("IBM OPAL RTC driver");
MODULE_LICENSE("GPL");
module_init(opal_rtc_init);
module_exit(opal_rtc_exit);