soc: mediatek: Add Mediatek CMDQ helper

Add Mediatek CMDQ helper to create CMDQ packet and assemble GCE op code.

Signed-off-by: Houlong Wei <houlong.wei@mediatek.com>
Signed-off-by: HS Liao <hs.liao@mediatek.com>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
This commit is contained in:
Houlong Wei 2018-11-29 11:37:09 +08:00 committed by Matthias Brugger
parent 651022382c
commit 576f1b4bc8
4 changed files with 446 additions and 0 deletions

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@ -4,6 +4,18 @@
menu "MediaTek SoC drivers"
depends on ARCH_MEDIATEK || COMPILE_TEST
config MTK_CMDQ
tristate "MediaTek CMDQ Support"
depends on ARCH_MEDIATEK || COMPILE_TEST
select MAILBOX
select MTK_CMDQ_MBOX
select MTK_INFRACFG
help
Say yes here to add support for the MediaTek Command Queue (CMDQ)
driver. The CMDQ is used to help read/write registers with critical
time limitation, such as updating display configuration during the
vblank.
config MTK_INFRACFG
bool "MediaTek INFRACFG Support"
select REGMAP

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@ -1,3 +1,4 @@
obj-$(CONFIG_MTK_CMDQ) += mtk-cmdq-helper.o
obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o
obj-$(CONFIG_MTK_PMIC_WRAP) += mtk-pmic-wrap.o
obj-$(CONFIG_MTK_SCPSYS) += mtk-scpsys.o

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// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2018 MediaTek Inc.
#include <linux/completion.h>
#include <linux/errno.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/mailbox_controller.h>
#include <linux/soc/mediatek/mtk-cmdq.h>
#define CMDQ_ARG_A_WRITE_MASK 0xffff
#define CMDQ_WRITE_ENABLE_MASK BIT(0)
#define CMDQ_EOC_IRQ_EN BIT(0)
#define CMDQ_EOC_CMD ((u64)((CMDQ_CODE_EOC << CMDQ_OP_CODE_SHIFT)) \
<< 32 | CMDQ_EOC_IRQ_EN)
static void cmdq_client_timeout(struct timer_list *t)
{
struct cmdq_client *client = from_timer(client, t, timer);
dev_err(client->client.dev, "cmdq timeout!\n");
}
struct cmdq_client *cmdq_mbox_create(struct device *dev, int index, u32 timeout)
{
struct cmdq_client *client;
client = kzalloc(sizeof(*client), GFP_KERNEL);
if (!client)
return (struct cmdq_client *)-ENOMEM;
client->timeout_ms = timeout;
if (timeout != CMDQ_NO_TIMEOUT) {
spin_lock_init(&client->lock);
timer_setup(&client->timer, cmdq_client_timeout, 0);
}
client->pkt_cnt = 0;
client->client.dev = dev;
client->client.tx_block = false;
client->chan = mbox_request_channel(&client->client, index);
if (IS_ERR(client->chan)) {
long err;
dev_err(dev, "failed to request channel\n");
err = PTR_ERR(client->chan);
kfree(client);
return ERR_PTR(err);
}
return client;
}
EXPORT_SYMBOL(cmdq_mbox_create);
void cmdq_mbox_destroy(struct cmdq_client *client)
{
if (client->timeout_ms != CMDQ_NO_TIMEOUT) {
spin_lock(&client->lock);
del_timer_sync(&client->timer);
spin_unlock(&client->lock);
}
mbox_free_channel(client->chan);
kfree(client);
}
EXPORT_SYMBOL(cmdq_mbox_destroy);
struct cmdq_pkt *cmdq_pkt_create(struct cmdq_client *client, size_t size)
{
struct cmdq_pkt *pkt;
struct device *dev;
dma_addr_t dma_addr;
pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
if (!pkt)
return ERR_PTR(-ENOMEM);
pkt->va_base = kzalloc(size, GFP_KERNEL);
if (!pkt->va_base) {
kfree(pkt);
return ERR_PTR(-ENOMEM);
}
pkt->buf_size = size;
pkt->cl = (void *)client;
dev = client->chan->mbox->dev;
dma_addr = dma_map_single(dev, pkt->va_base, pkt->buf_size,
DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma_addr)) {
dev_err(dev, "dma map failed, size=%u\n", (u32)(u64)size);
kfree(pkt->va_base);
kfree(pkt);
return ERR_PTR(-ENOMEM);
}
pkt->pa_base = dma_addr;
return pkt;
}
EXPORT_SYMBOL(cmdq_pkt_create);
void cmdq_pkt_destroy(struct cmdq_pkt *pkt)
{
struct cmdq_client *client = (struct cmdq_client *)pkt->cl;
dma_unmap_single(client->chan->mbox->dev, pkt->pa_base, pkt->buf_size,
DMA_TO_DEVICE);
kfree(pkt->va_base);
kfree(pkt);
}
EXPORT_SYMBOL(cmdq_pkt_destroy);
static int cmdq_pkt_append_command(struct cmdq_pkt *pkt, enum cmdq_code code,
u32 arg_a, u32 arg_b)
{
u64 *cmd_ptr;
if (unlikely(pkt->cmd_buf_size + CMDQ_INST_SIZE > pkt->buf_size)) {
/*
* In the case of allocated buffer size (pkt->buf_size) is used
* up, the real required size (pkt->cmdq_buf_size) is still
* increased, so that the user knows how much memory should be
* ultimately allocated after appending all commands and
* flushing the command packet. Therefor, the user can call
* cmdq_pkt_create() again with the real required buffer size.
*/
pkt->cmd_buf_size += CMDQ_INST_SIZE;
WARN_ONCE(1, "%s: buffer size %u is too small !\n",
__func__, (u32)pkt->buf_size);
return -ENOMEM;
}
cmd_ptr = pkt->va_base + pkt->cmd_buf_size;
(*cmd_ptr) = (u64)((code << CMDQ_OP_CODE_SHIFT) | arg_a) << 32 | arg_b;
pkt->cmd_buf_size += CMDQ_INST_SIZE;
return 0;
}
int cmdq_pkt_write(struct cmdq_pkt *pkt, u32 value, u32 subsys, u32 offset)
{
u32 arg_a = (offset & CMDQ_ARG_A_WRITE_MASK) |
(subsys << CMDQ_SUBSYS_SHIFT);
return cmdq_pkt_append_command(pkt, CMDQ_CODE_WRITE, arg_a, value);
}
EXPORT_SYMBOL(cmdq_pkt_write);
int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u32 value,
u32 subsys, u32 offset, u32 mask)
{
u32 offset_mask = offset;
int err = 0;
if (mask != 0xffffffff) {
err = cmdq_pkt_append_command(pkt, CMDQ_CODE_MASK, 0, ~mask);
offset_mask |= CMDQ_WRITE_ENABLE_MASK;
}
err |= cmdq_pkt_write(pkt, value, subsys, offset_mask);
return err;
}
EXPORT_SYMBOL(cmdq_pkt_write_mask);
int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u32 event)
{
u32 arg_b;
if (event >= CMDQ_MAX_EVENT)
return -EINVAL;
/*
* WFE arg_b
* bit 0-11: wait value
* bit 15: 1 - wait, 0 - no wait
* bit 16-27: update value
* bit 31: 1 - update, 0 - no update
*/
arg_b = CMDQ_WFE_UPDATE | CMDQ_WFE_WAIT | CMDQ_WFE_WAIT_VALUE;
return cmdq_pkt_append_command(pkt, CMDQ_CODE_WFE, event, arg_b);
}
EXPORT_SYMBOL(cmdq_pkt_wfe);
int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u32 event)
{
if (event >= CMDQ_MAX_EVENT)
return -EINVAL;
return cmdq_pkt_append_command(pkt, CMDQ_CODE_WFE, event,
CMDQ_WFE_UPDATE);
}
EXPORT_SYMBOL(cmdq_pkt_clear_event);
static int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
{
int err;
/* insert EOC and generate IRQ for each command iteration */
err = cmdq_pkt_append_command(pkt, CMDQ_CODE_EOC, 0, CMDQ_EOC_IRQ_EN);
/* JUMP to end */
err |= cmdq_pkt_append_command(pkt, CMDQ_CODE_JUMP, 0, CMDQ_JUMP_PASS);
return err;
}
static void cmdq_pkt_flush_async_cb(struct cmdq_cb_data data)
{
struct cmdq_pkt *pkt = (struct cmdq_pkt *)data.data;
struct cmdq_task_cb *cb = &pkt->cb;
struct cmdq_client *client = (struct cmdq_client *)pkt->cl;
if (client->timeout_ms != CMDQ_NO_TIMEOUT) {
unsigned long flags = 0;
spin_lock_irqsave(&client->lock, flags);
if (--client->pkt_cnt == 0)
del_timer(&client->timer);
else
mod_timer(&client->timer, jiffies +
msecs_to_jiffies(client->timeout_ms));
spin_unlock_irqrestore(&client->lock, flags);
}
dma_sync_single_for_cpu(client->chan->mbox->dev, pkt->pa_base,
pkt->cmd_buf_size, DMA_TO_DEVICE);
if (cb->cb) {
data.data = cb->data;
cb->cb(data);
}
}
int cmdq_pkt_flush_async(struct cmdq_pkt *pkt, cmdq_async_flush_cb cb,
void *data)
{
int err;
unsigned long flags = 0;
struct cmdq_client *client = (struct cmdq_client *)pkt->cl;
err = cmdq_pkt_finalize(pkt);
if (err < 0)
return err;
pkt->cb.cb = cb;
pkt->cb.data = data;
pkt->async_cb.cb = cmdq_pkt_flush_async_cb;
pkt->async_cb.data = pkt;
dma_sync_single_for_device(client->chan->mbox->dev, pkt->pa_base,
pkt->cmd_buf_size, DMA_TO_DEVICE);
if (client->timeout_ms != CMDQ_NO_TIMEOUT) {
spin_lock_irqsave(&client->lock, flags);
if (client->pkt_cnt++ == 0)
mod_timer(&client->timer, jiffies +
msecs_to_jiffies(client->timeout_ms));
spin_unlock_irqrestore(&client->lock, flags);
}
mbox_send_message(client->chan, pkt);
/* We can send next packet immediately, so just call txdone. */
mbox_client_txdone(client->chan, 0);
return 0;
}
EXPORT_SYMBOL(cmdq_pkt_flush_async);
struct cmdq_flush_completion {
struct completion cmplt;
bool err;
};
static void cmdq_pkt_flush_cb(struct cmdq_cb_data data)
{
struct cmdq_flush_completion *cmplt;
cmplt = (struct cmdq_flush_completion *)data.data;
if (data.sta != CMDQ_CB_NORMAL)
cmplt->err = true;
else
cmplt->err = false;
complete(&cmplt->cmplt);
}
int cmdq_pkt_flush(struct cmdq_pkt *pkt)
{
struct cmdq_flush_completion cmplt;
int err;
init_completion(&cmplt.cmplt);
err = cmdq_pkt_flush_async(pkt, cmdq_pkt_flush_cb, &cmplt);
if (err < 0)
return err;
wait_for_completion(&cmplt.cmplt);
return cmplt.err ? -EFAULT : 0;
}
EXPORT_SYMBOL(cmdq_pkt_flush);
MODULE_LICENSE("GPL v2");

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2018 MediaTek Inc.
*
*/
#ifndef __MTK_CMDQ_H__
#define __MTK_CMDQ_H__
#include <linux/mailbox_client.h>
#include <linux/mailbox/mtk-cmdq-mailbox.h>
#include <linux/timer.h>
#define CMDQ_NO_TIMEOUT 0xffffffffu
/** cmdq event maximum */
#define CMDQ_MAX_EVENT 0x3ff
struct cmdq_pkt;
struct cmdq_client {
spinlock_t lock;
u32 pkt_cnt;
struct mbox_client client;
struct mbox_chan *chan;
struct timer_list timer;
u32 timeout_ms; /* in unit of microsecond */
};
/**
* cmdq_mbox_create() - create CMDQ mailbox client and channel
* @dev: device of CMDQ mailbox client
* @index: index of CMDQ mailbox channel
* @timeout: timeout of a pkt execution by GCE, in unit of microsecond, set
* CMDQ_NO_TIMEOUT if a timer is not used.
*
* Return: CMDQ mailbox client pointer
*/
struct cmdq_client *cmdq_mbox_create(struct device *dev, int index,
u32 timeout);
/**
* cmdq_mbox_destroy() - destroy CMDQ mailbox client and channel
* @client: the CMDQ mailbox client
*/
void cmdq_mbox_destroy(struct cmdq_client *client);
/**
* cmdq_pkt_create() - create a CMDQ packet
* @client: the CMDQ mailbox client
* @size: required CMDQ buffer size
*
* Return: CMDQ packet pointer
*/
struct cmdq_pkt *cmdq_pkt_create(struct cmdq_client *client, size_t size);
/**
* cmdq_pkt_destroy() - destroy the CMDQ packet
* @pkt: the CMDQ packet
*/
void cmdq_pkt_destroy(struct cmdq_pkt *pkt);
/**
* cmdq_pkt_write() - append write command to the CMDQ packet
* @pkt: the CMDQ packet
* @value: the specified target register value
* @subsys: the CMDQ sub system code
* @offset: register offset from CMDQ sub system
*
* Return: 0 for success; else the error code is returned
*/
int cmdq_pkt_write(struct cmdq_pkt *pkt, u32 value, u32 subsys, u32 offset);
/**
* cmdq_pkt_write_mask() - append write command with mask to the CMDQ packet
* @pkt: the CMDQ packet
* @value: the specified target register value
* @subsys: the CMDQ sub system code
* @offset: register offset from CMDQ sub system
* @mask: the specified target register mask
*
* Return: 0 for success; else the error code is returned
*/
int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u32 value,
u32 subsys, u32 offset, u32 mask);
/**
* cmdq_pkt_wfe() - append wait for event command to the CMDQ packet
* @pkt: the CMDQ packet
* @event: the desired event type to "wait and CLEAR"
*
* Return: 0 for success; else the error code is returned
*/
int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u32 event);
/**
* cmdq_pkt_clear_event() - append clear event command to the CMDQ packet
* @pkt: the CMDQ packet
* @event: the desired event to be cleared
*
* Return: 0 for success; else the error code is returned
*/
int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u32 event);
/**
* cmdq_pkt_flush_async() - trigger CMDQ to asynchronously execute the CMDQ
* packet and call back at the end of done packet
* @pkt: the CMDQ packet
* @cb: called at the end of done packet
* @data: this data will pass back to cb
*
* Return: 0 for success; else the error code is returned
*
* Trigger CMDQ to asynchronously execute the CMDQ packet and call back
* at the end of done packet. Note that this is an ASYNC function. When the
* function returned, it may or may not be finished.
*/
int cmdq_pkt_flush_async(struct cmdq_pkt *pkt, cmdq_async_flush_cb cb,
void *data);
/**
* cmdq_pkt_flush() - trigger CMDQ to execute the CMDQ packet
* @pkt: the CMDQ packet
*
* Return: 0 for success; else the error code is returned
*
* Trigger CMDQ to execute the CMDQ packet. Note that this is a
* synchronous flush function. When the function returned, the recorded
* commands have been done.
*/
int cmdq_pkt_flush(struct cmdq_pkt *pkt);
#endif /* __MTK_CMDQ_H__ */