mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Suraj Jitindar Singh](/assets/img/avatar_default.png)
An opal_msg of type OPAL_MSG_ASYNC_COMP contains the return code in the params[1] struct member. However this isn't intuitive or obvious when reading the code and requires that a user look at the skiboot documentation or opal-api.h to verify this. Add an inline function to get the return code from an opal_msg and update call sites accordingly. Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
263 lines
6 KiB
C
263 lines
6 KiB
C
/*
|
|
* 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);
|
|
|
|
tm->tm_wday = -1;
|
|
}
|
|
|
|
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 = opal_get_async_rc(msg);
|
|
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;
|
|
struct opal_msg msg;
|
|
u32 y_m_d = 0;
|
|
int token, 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 = opal_get_async_rc(msg);
|
|
if (rc != OPAL_SUCCESS)
|
|
rc = -EIO;
|
|
|
|
exit:
|
|
opal_async_release_token(token);
|
|
return rc;
|
|
}
|
|
|
|
static struct rtc_class_ops opal_rtc_ops = {
|
|
.read_time = opal_get_rtc_time,
|
|
.set_time = opal_set_rtc_time,
|
|
};
|
|
|
|
static int opal_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct rtc_device *rtc;
|
|
|
|
if (pdev->dev.of_node &&
|
|
(of_property_read_bool(pdev->dev.of_node, "wakeup-source") ||
|
|
of_property_read_bool(pdev->dev.of_node, "has-tpo")/* legacy */)) {
|
|
device_set_wakeup_capable(&pdev->dev, true);
|
|
opal_rtc_ops.read_alarm = opal_get_tpo_time;
|
|
opal_rtc_ops.set_alarm = opal_set_tpo_time;
|
|
}
|
|
|
|
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,
|
|
.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);
|