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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
*/
#include <linux/atomic.h>
#include <linux/bug.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/wait.h>
#include <soc/qcom/rpmh.h>
#include "rpmh-internal.h"
#define RPMH_TIMEOUT_MS msecs_to_jiffies(10000)
#define DEFINE_RPMH_MSG_ONSTACK(device, s, q, name) \
struct rpmh_request name = { \
.msg = { \
.state = s, \
.cmds = name.cmd, \
.num_cmds = 0, \
.wait_for_compl = true, \
}, \
.cmd = { { 0 } }, \
.completion = q, \
.dev = device, \
.needs_free = false, \
}
#define ctrlr_to_drv(ctrlr) container_of(ctrlr, struct rsc_drv, client)
/**
* struct cache_req: the request object for caching
*
* @addr: the address of the resource
* @sleep_val: the sleep vote
* @wake_val: the wake vote
* @list: linked list obj
*/
struct cache_req {
u32 addr;
u32 sleep_val;
u32 wake_val;
struct list_head list;
};
/**
* struct batch_cache_req - An entry in our batch catch
*
* @list: linked list obj
* @count: number of messages
* @rpm_msgs: the messages
*/
struct batch_cache_req {
struct list_head list;
int count;
struct rpmh_request rpm_msgs[];
};
static struct rpmh_ctrlr *get_rpmh_ctrlr(const struct device *dev)
{
struct rsc_drv *drv = dev_get_drvdata(dev->parent);
return &drv->client;
}
void rpmh_tx_done(const struct tcs_request *msg, int r)
{
struct rpmh_request *rpm_msg = container_of(msg, struct rpmh_request,
msg);
struct completion *compl = rpm_msg->completion;
bool free = rpm_msg->needs_free;
rpm_msg->err = r;
if (r)
dev_err(rpm_msg->dev, "RPMH TX fail in msg addr=%#x, err=%d\n",
rpm_msg->msg.cmds[0].addr, r);
if (!compl)
goto exit;
/* Signal the blocking thread we are done */
complete(compl);
exit:
if (free)
kfree(rpm_msg);
}
static struct cache_req *__find_req(struct rpmh_ctrlr *ctrlr, u32 addr)
{
struct cache_req *p, *req = NULL;
list_for_each_entry(p, &ctrlr->cache, list) {
if (p->addr == addr) {
req = p;
break;
}
}
return req;
}
static struct cache_req *cache_rpm_request(struct rpmh_ctrlr *ctrlr,
enum rpmh_state state,
struct tcs_cmd *cmd)
{
struct cache_req *req;
unsigned long flags;
u32 old_sleep_val, old_wake_val;
spin_lock_irqsave(&ctrlr->cache_lock, flags);
req = __find_req(ctrlr, cmd->addr);
if (req)
goto existing;
req = kzalloc(sizeof(*req), GFP_ATOMIC);
if (!req) {
req = ERR_PTR(-ENOMEM);
goto unlock;
}
req->addr = cmd->addr;
req->sleep_val = req->wake_val = UINT_MAX;
list_add_tail(&req->list, &ctrlr->cache);
existing:
old_sleep_val = req->sleep_val;
old_wake_val = req->wake_val;
switch (state) {
case RPMH_ACTIVE_ONLY_STATE:
case RPMH_WAKE_ONLY_STATE:
req->wake_val = cmd->data;
break;
case RPMH_SLEEP_STATE:
req->sleep_val = cmd->data;
break;
}
ctrlr->dirty = (req->sleep_val != old_sleep_val ||
req->wake_val != old_wake_val) &&
req->sleep_val != UINT_MAX &&
req->wake_val != UINT_MAX;
unlock:
spin_unlock_irqrestore(&ctrlr->cache_lock, flags);
return req;
}
/**
* __rpmh_write: Cache and send the RPMH request
*
* @dev: The device making the request
* @state: Active/Sleep request type
* @rpm_msg: The data that needs to be sent (cmds).
*
* Cache the RPMH request and send if the state is ACTIVE_ONLY.
* SLEEP/WAKE_ONLY requests are not sent to the controller at
* this time. Use rpmh_flush() to send them to the controller.
*/
static int __rpmh_write(const struct device *dev, enum rpmh_state state,
struct rpmh_request *rpm_msg)
{
struct rpmh_ctrlr *ctrlr = get_rpmh_ctrlr(dev);
int ret = -EINVAL;
struct cache_req *req;
int i;
rpm_msg->msg.state = state;
/* Cache the request in our store and link the payload */
for (i = 0; i < rpm_msg->msg.num_cmds; i++) {
req = cache_rpm_request(ctrlr, state, &rpm_msg->msg.cmds[i]);
if (IS_ERR(req))
return PTR_ERR(req);
}
rpm_msg->msg.state = state;
if (state == RPMH_ACTIVE_ONLY_STATE) {
WARN_ON(irqs_disabled());
ret = rpmh_rsc_send_data(ctrlr_to_drv(ctrlr), &rpm_msg->msg);
} else {
/* Clean up our call by spoofing tx_done */
ret = 0;
rpmh_tx_done(&rpm_msg->msg, ret);
}
return ret;
}
static int __fill_rpmh_msg(struct rpmh_request *req, enum rpmh_state state,
const struct tcs_cmd *cmd, u32 n)
{
if (!cmd || !n || n > MAX_RPMH_PAYLOAD)
return -EINVAL;
memcpy(req->cmd, cmd, n * sizeof(*cmd));
req->msg.state = state;
req->msg.cmds = req->cmd;
req->msg.num_cmds = n;
return 0;
}
/**
* rpmh_write_async: Write a set of RPMH commands
*
* @dev: The device making the request
* @state: Active/sleep set
* @cmd: The payload data
* @n: The number of elements in payload
*
* Write a set of RPMH commands, the order of commands is maintained
* and will be sent as a single shot.
*/
int rpmh_write_async(const struct device *dev, enum rpmh_state state,
const struct tcs_cmd *cmd, u32 n)
{
struct rpmh_request *rpm_msg;
int ret;
rpm_msg = kzalloc(sizeof(*rpm_msg), GFP_ATOMIC);
if (!rpm_msg)
return -ENOMEM;
rpm_msg->needs_free = true;
ret = __fill_rpmh_msg(rpm_msg, state, cmd, n);
if (ret) {
kfree(rpm_msg);
return ret;
}
return __rpmh_write(dev, state, rpm_msg);
}
EXPORT_SYMBOL(rpmh_write_async);
/**
* rpmh_write: Write a set of RPMH commands and block until response
*
* @rc: The RPMH handle got from rpmh_get_client
* @state: Active/sleep set
* @cmd: The payload data
* @n: The number of elements in @cmd
*
* May sleep. Do not call from atomic contexts.
*/
int rpmh_write(const struct device *dev, enum rpmh_state state,
const struct tcs_cmd *cmd, u32 n)
{
DECLARE_COMPLETION_ONSTACK(compl);
DEFINE_RPMH_MSG_ONSTACK(dev, state, &compl, rpm_msg);
int ret;
if (!cmd || !n || n > MAX_RPMH_PAYLOAD)
return -EINVAL;
memcpy(rpm_msg.cmd, cmd, n * sizeof(*cmd));
rpm_msg.msg.num_cmds = n;
ret = __rpmh_write(dev, state, &rpm_msg);
if (ret)
return ret;
ret = wait_for_completion_timeout(&compl, RPMH_TIMEOUT_MS);
WARN_ON(!ret);
return (ret > 0) ? 0 : -ETIMEDOUT;<
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