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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_WRITE_ENABLE_MASK BIT(0)
#define CMDQ_POLL_ENABLE_MASK BIT(0)
#define CMDQ_EOC_IRQ_EN BIT(0)
struct cmdq_instruction {
union {
u32 value;
u32 mask;
};
union {
u16 offset;
u16 event;
};
u8 subsys;
u8 op;
};
int cmdq_dev_get_client_reg(struct device *dev,
struct cmdq_client_reg *client_reg, int idx)
{
struct of_phandle_args spec;
int err;
if (!client_reg)
return -ENOENT;
err = of_parse_phandle_with_fixed_args(dev->of_node,
"mediatek,gce-client-reg",
3, idx, &spec);
if (err < 0) {
dev_err(dev,
"error %d can't parse gce-client-reg property (%d)",
err, idx);
return err;
}
client_reg->subsys = (u8)spec.args[0];
client_reg->offset = (u16)spec.args[1];
client_reg->size = (u16)spec.args[2];
of_node_put(spec.np);
return 0;
}
EXPORT_SYMBOL(cmdq_dev_get_client_reg);
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->client.knows_txdone = true;
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,
struct cmdq_instruction inst)
{
struct cmdq_instruction *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 = inst;
pkt->cmd_buf_size += CMDQ_INST_SIZE;
return 0;
}
int cmdq_pkt_write(struct cmdq_pkt *pkt, u8 subsys, u16 offset, u32 value)
{
struct cmdq_instruction inst;
inst.op = CMDQ_CODE_WRITE;
inst.value = value;
inst.offset = offset;
inst.subsys = subsys;
return cmdq_pkt_append_command(pkt, inst);
}
EXPORT_SYMBOL(cmdq_pkt_write);
int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys,
u16 offset, u32 value, u32 mask)
{
struct cmdq_instruction inst = { {0} };
u16 offset_mask = offset;
int err;
if (mask != 0xffffffff) {
inst.op = CMDQ_CODE_MASK;
inst.mask = ~mask;
err = cmdq_pkt_append_command(pkt, inst);
if (err < 0)
return err;
offset_mask |= CMDQ_WRITE_ENABLE_MASK;
}
err = cmdq_pkt_write(pkt, subsys, offset_mask, value);
return err;
}
EXPORT_SYMBOL(cmdq_pkt_write_mask);
int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event)
{
struct cmdq_instruction inst = { {0} };
if (event >= CMDQ_MAX_EVENT)
return -EINVAL;
inst.op = CMDQ_CODE_WFE;
inst.value = CMDQ_WFE_OPTION;
inst.event = event;
return cmdq_pkt_append_command(pkt, inst);
}
EXPORT_SYMBOL(cmdq_pkt_wfe);
int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u16 event)
{
struct cmdq_instruction inst = { {0} };
if (event >= CMDQ_MAX_EVENT)
return -EINVAL;
inst.op = CMDQ_CODE_WFE;
inst.value = CMDQ_WFE_UPDATE;
inst.event = event;
return cmdq_pkt_append_command(pkt, inst);
}
EXPORT_SYMBOL(cmdq_pkt_clear_event);
int cmdq_pkt_poll(struct cmdq_pkt *pkt, u8 subsys,
u16 offset, u32 value)
{
struct cmdq_instruction inst = { {0} };
int err;
inst.op = CMDQ_CODE_POLL;
inst.value = value;
inst.offset = offset;
inst.subsys = subsys;
err = cmdq_pkt_append_command(pkt, inst);
return err;
}
EXPORT_SYMBOL(cmdq_pkt_poll);
int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
u16 offset, u32 value, u32 mask)
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