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mt76/mt76x02_usb_mcu.c
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Felix Fietkau 33f29d2345 wifi: mt76: relicense to BSD-3-Clause-Clear 
MediaTek has asked to switch from the ISC license to BSD-3-Clause-Clear,
in order to improve clarity and the legal integrity of the code.

The BSD-3-Clause license includes the "no endorsement" clause, which is
important for protecting the reputation of the original authors and
contributors by preventing unauthorized use of their names for endorsement
purposes.

This clause is absent in the BSD-2-Clause license, which is more permissive
but lacks this specific protection.

This change also cleans up the license of some Kconfig/Makefile files,
which were accidentally marked as GPL.

The GPL 2.0 remains in use on mt76x0, as well as two source files in mt7615
for which the license situation still needs to be clarified.

Signed-off-by: Felix Fietkau <[email protected]>
2025-10-13 11:11:19 +02:00

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// SPDX-License-Identifier: BSD-3-Clause-Clear
/*
* Copyright (C) 2018 Lorenzo Bianconi <[email protected]>
*/
#include <linux/module.h>
#include <linux/firmware.h>
#include "mt76x02.h"
#include "mt76x02_mcu.h"
#include "mt76x02_usb.h"
#define MT_CMD_HDR_LEN 4
#define MT_FCE_DMA_ADDR 0x0230
#define MT_FCE_DMA_LEN 0x0234
#define MT_TX_CPU_FROM_FCE_CPU_DESC_IDX 0x09a8
static void
mt76x02u_multiple_mcu_reads(struct mt76_dev *dev, u8 *data, int len)
{
struct mt76_usb *usb = &dev->usb;
int i;
WARN_ON_ONCE(len / 8 != usb->mcu.rp_len);
for (i = 0; i < usb->mcu.rp_len; i++) {
u32 reg = get_unaligned_le32(data + 8 * i) - usb->mcu.base;
u32 val = get_unaligned_le32(data + 8 * i + 4);
WARN_ON_ONCE(usb->mcu.rp[i].reg != reg);
usb->mcu.rp[i].value = val;
}
}
static int mt76x02u_mcu_wait_resp(struct mt76_dev *dev, u8 seq)
{
struct mt76_usb *usb = &dev->usb;
u8 *data = usb->mcu.data;
int i, len, ret;
u32 rxfce;
for (i = 0; i < 5; i++) {
ret = mt76u_bulk_msg(dev, data, MCU_RESP_URB_SIZE, &len,
300, MT_EP_IN_CMD_RESP);
if (ret == -ETIMEDOUT)
continue;
if (ret)
goto out;
if (usb->mcu.rp)
mt76x02u_multiple_mcu_reads(dev, data + 4, len - 8);
rxfce = get_unaligned_le32(data);
if (seq == FIELD_GET(MT_RX_FCE_INFO_CMD_SEQ, rxfce) &&
FIELD_GET(MT_RX_FCE_INFO_EVT_TYPE, rxfce) == EVT_CMD_DONE)
return 0;
dev_err(dev->dev, "error: MCU resp evt:%lx seq:%hhx-%lx\n",
FIELD_GET(MT_RX_FCE_INFO_EVT_TYPE, rxfce),
seq, FIELD_GET(MT_RX_FCE_INFO_CMD_SEQ, rxfce));
}
out:
dev_err(dev->dev, "error: %s failed with %d\n", __func__, ret);
return ret;
}
static int
__mt76x02u_mcu_send_msg(struct mt76_dev *dev, struct sk_buff *skb,
int cmd, bool wait_resp)
{
u8 seq = 0;
u32 info;
int ret;
if (test_bit(MT76_REMOVED, &dev->phy.state)) {
ret = 0;
goto out;
}
if (wait_resp) {
seq = ++dev->mcu.msg_seq & 0xf;
if (!seq)
seq = ++dev->mcu.msg_seq & 0xf;
}
info = FIELD_PREP(MT_MCU_MSG_CMD_SEQ, seq) |
FIELD_PREP(MT_MCU_MSG_CMD_TYPE, cmd) |
MT_MCU_MSG_TYPE_CMD;
ret = mt76x02u_skb_dma_info(skb, CPU_TX_PORT, info);
if (ret)
return ret;
ret = mt76u_bulk_msg(dev, skb->data, skb->len, NULL, 500,
MT_EP_OUT_INBAND_CMD);
if (ret)
goto out;
if (wait_resp)
ret = mt76x02u_mcu_wait_resp(dev, seq);
out:
consume_skb(skb);
return ret;
}
static int
mt76x02u_mcu_send_msg(struct mt76_dev *dev, int cmd, const void *data,
int len, bool wait_resp)
{
struct sk_buff *skb;
int err;
skb = mt76_mcu_msg_alloc(dev, data, len);
if (!skb)
return -ENOMEM;
mutex_lock(&dev->mcu.mutex);
err = __mt76x02u_mcu_send_msg(dev, skb, cmd, wait_resp);
mutex_unlock(&dev->mcu.mutex);
return err;
}
static inline void skb_put_le32(struct sk_buff *skb, u32 val)
{
put_unaligned_le32(val, skb_put(skb, 4));
}
static int
mt76x02u_mcu_wr_rp(struct mt76_dev *dev, u32 base,
const struct mt76_reg_pair *data, int n)
{
const int max_vals_per_cmd = MT_INBAND_PACKET_MAX_LEN / 8;
const int CMD_RANDOM_WRITE = 12;
struct sk_buff *skb;
int cnt, i, ret;
if (!n)
return 0;
cnt = min(max_vals_per_cmd, n);
skb = alloc_skb(cnt * 8 + MT_DMA_HDR_LEN + 4, GFP_KERNEL);
if (!skb)
return -ENOMEM;
skb_reserve(skb, MT_DMA_HDR_LEN);
for (i = 0; i < cnt; i++) {
skb_put_le32(skb, base + data[i].reg);
skb_put_le32(skb, data[i].value);
}
mutex_lock(&dev->mcu.mutex);
ret = __mt76x02u_mcu_send_msg(dev, skb, CMD_RANDOM_WRITE, cnt == n);
mutex_unlock(&dev->mcu.mutex);
if (ret)
return ret;
return mt76x02u_mcu_wr_rp(dev, base, data + cnt, n - cnt);
}
static int
mt76x02u_mcu_rd_rp(struct mt76_dev *dev, u32 base,
struct mt76_reg_pair *data, int n)
{
const int CMD_RANDOM_READ = 10;
const int max_vals_per_cmd = MT_INBAND_PACKET_MAX_LEN / 8;
struct mt76_usb *usb = &dev->usb;
struct sk_buff *skb;
int cnt, i, ret;
if (!n)
return 0;
cnt = min(max_vals_per_cmd, n);
if (cnt != n)
return -EINVAL;
skb = alloc_skb(cnt * 8 + MT_DMA_HDR_LEN + 4, GFP_KERNEL);
if (!skb)
return -ENOMEM;
skb_reserve(skb, MT_DMA_HDR_LEN);
for (i = 0; i < cnt; i++) {
skb_put_le32(skb, base + data[i].reg);
skb_put_le32(skb, data[i].value);
}
mutex_lock(&dev->mcu.mutex);
usb->mcu.rp = data;
usb->mcu.rp_len = n;
usb->mcu.base = base;
ret = __mt76x02u_mcu_send_msg(dev, skb, CMD_RANDOM_READ, true);
usb->mcu.rp = NULL;
mutex_unlock(&dev->mcu.mutex);
return ret;
}
void mt76x02u_mcu_fw_reset(struct mt76x02_dev *dev)
{
mt76u_vendor_request(&dev->mt76, MT_VEND_DEV_MODE,
USB_DIR_OUT | USB_TYPE_VENDOR,
0x1, 0, NULL, 0);
}
EXPORT_SYMBOL_GPL(mt76x02u_mcu_fw_reset);
static int
__mt76x02u_mcu_fw_send_data(struct mt76x02_dev *dev, u8 *data,
const void *fw_data, int len, u32 dst_addr)
{
__le32 info;
u32 val;
int err, data_len;
info = cpu_to_le32(FIELD_PREP(MT_MCU_MSG_PORT, CPU_TX_PORT) |
FIELD_PREP(MT_MCU_MSG_LEN, len) |
MT_MCU_MSG_TYPE_CMD);
memcpy(data, &info, sizeof(info));
memcpy(data + sizeof(info), fw_data, len);
memset(data + sizeof(info) + len, 0, 4);
mt76u_single_wr(&dev->mt76, MT_VEND_WRITE_FCE,
MT_FCE_DMA_ADDR, dst_addr);
len = roundup(len, 4);
mt76u_single_wr(&dev->mt76, MT_VEND_WRITE_FCE,
MT_FCE_DMA_LEN, len << 16);
data_len = MT_CMD_HDR_LEN + len + sizeof(info);
err = mt76u_bulk_msg(&dev->mt76, data, data_len, NULL, 1000,
MT_EP_OUT_INBAND_CMD);
if (err) {
dev_err(dev->mt76.dev, "firmware upload failed: %d\n", err);
return err;
}
val = mt76_rr(dev, MT_TX_CPU_FROM_FCE_CPU_DESC_IDX);
val++;
mt76_wr(dev, MT_TX_CPU_FROM_FCE_CPU_DESC_IDX, val);
return 0;
}
int mt76x02u_mcu_fw_send_data(struct mt76x02_dev *dev, const void *data,
int data_len, u32 max_payload, u32 offset)
{
int len, err = 0, pos = 0, max_len = max_payload - 8;
u8 *buf;
buf = kmalloc(max_payload, GFP_KERNEL);
if (!buf)
return -ENOMEM;
while (data_len > 0) {
len = min_t(int, data_len, max_len);
err = __mt76x02u_mcu_fw_send_data(dev, buf, data + pos,
len, offset + pos);
if (err < 0)
break;
data_len -= len;
pos += len;
usleep_range(5000, 10000);
}
kfree(buf);
return err;
}
EXPORT_SYMBOL_GPL(mt76x02u_mcu_fw_send_data);
void mt76x02u_init_mcu(struct mt76_dev *dev)
{
static const struct mt76_mcu_ops mt76x02u_mcu_ops = {
.headroom = MT_CMD_HDR_LEN,
.tailroom = 8,
.mcu_send_msg = mt76x02u_mcu_send_msg,
.mcu_parse_response = mt76x02_mcu_parse_response,
.mcu_wr_rp = mt76x02u_mcu_wr_rp,
.mcu_rd_rp = mt76x02u_mcu_rd_rp,
};
dev->mcu_ops = &mt76x02u_mcu_ops;
}
EXPORT_SYMBOL_GPL(mt76x02u_init_mcu);
MODULE_AUTHOR("Lorenzo Bianconi <[email protected]>");
MODULE_DESCRIPTION("MediaTek MT76x02 MCU helpers");
MODULE_LICENSE("Dual BSD/GPL");
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