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mt76x02_usb_mcu.c
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/*
* Copyright (C) 2018 Lorenzo Bianconi <[email protected]>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#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 struct sk_buff *
mt76x02u_mcu_msg_alloc(const void *data, int len)
{
struct sk_buff *skb;
skb = alloc_skb(MT_CMD_HDR_LEN + len + 8, GFP_KERNEL);
if (!skb)
return NULL;
skb_reserve(skb, MT_CMD_HDR_LEN);
skb_put_data(skb, data, len);
return skb;
}
static void
mt76x02u_multiple_mcu_reads(struct mt76_dev *dev, u8 *data, int len)
{
struct mt76_usb *usb = &dev->usb;
u32 reg, val;
int i;
if (usb->mcu.burst) {
WARN_ON_ONCE(len / 4 != usb->mcu.rp_len);
reg = usb->mcu.rp[0].reg - usb->mcu.base;
for (i = 0; i < usb->mcu.rp_len; i++) {
val = get_unaligned_le32(data + 4 * i);
usb->mcu.rp[i].reg = reg++;
usb->mcu.rp[i].value = val;
}
} else {
WARN_ON_ONCE(len / 8 != usb->mcu.rp_len);
for (i = 0; i < usb->mcu.rp_len; i++) {
reg = get_unaligned_le32(data + 8 * i) -
usb->mcu.base;
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;
struct mt76u_buf *buf = &usb->mcu.res;
struct urb *urb = buf->urb;
int i, ret;
u32 rxfce;
u8 *data;
for (i = 0; i < 5; i++) {
if (!wait_for_completion_timeout(&usb->mcu.cmpl,
msecs_to_jiffies(300)))
continue;
if (urb->status)
return -EIO;
data = sg_virt(&urb->sg[0]);
if (usb->mcu.rp)
mt76x02u_multiple_mcu_reads(dev, data + 4,
urb->actual_length - 8);
rxfce = get_unaligned_le32(data);
ret = mt76u_submit_buf(dev, USB_DIR_IN,
MT_EP_IN_CMD_RESP,
buf, GFP_KERNEL,
mt76u_mcu_complete_urb,
&usb->mcu.cmpl);
if (ret)
return ret;
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));
}
dev_err(dev->dev, "error: %s timed out\n", __func__);
return -ETIMEDOUT;
}
static int
__mt76x02u_mcu_send_msg(struct mt76_dev *dev, struct sk_buff *skb,
int cmd, bool wait_resp)
{
struct usb_interface *intf = to_usb_interface(dev->dev);
struct usb_device *udev = interface_to_usbdev(intf);
struct mt76_usb *usb = &dev->usb;
unsigned int pipe;
int ret, sent;
u8 seq = 0;
u32 info;
if (!skb)
return -EINVAL;
if (test_bit(MT76_REMOVED, &dev->state))
return 0;
pipe = usb_sndbulkpipe(udev, usb->out_ep[MT_EP_OUT_INBAND_CMD]);
if (wait_resp) {
seq = ++usb->mcu.msg_seq & 0xf;
if (!seq)
seq = ++usb->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 = usb_bulk_msg(udev, pipe, skb->data, skb->len, &sent, 500);
if (ret)
return ret;
if (wait_resp)
ret = mt76x02u_mcu_wait_resp(dev, seq);
consume_skb(skb);
return ret;
}
static int
mt76x02u_mcu_send_msg(struct mt76_dev *dev, struct sk_buff *skb,
int cmd, bool wait_resp)
{
struct mt76_usb *usb = &dev->usb;
int err;
mutex_lock(&usb->mcu.mutex);
err = __mt76x02u_mcu_send_msg(dev, skb, cmd, wait_resp);
mutex_unlock(&usb->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 CMD_RANDOM_WRITE = 12;
const int max_vals_per_cmd = MT_INBAND_PACKET_MAX_LEN / 8;
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);
}
ret = mt76x02u_mcu_send_msg(dev, skb, CMD_RANDOM_WRITE, cnt == n);
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(&usb->mcu.mutex);
usb->mcu.rp = data;
usb->mcu.rp_len = n;
usb->mcu.base = base;
usb->mcu.burst = false;
ret = __mt76x02u_mcu_send_msg(dev, skb, CMD_RANDOM_READ, true);
usb->mcu.rp = NULL;
mutex_unlock(&usb->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, struct mt76u_buf *buf,
const void *fw_data, int len, u32 dst_addr)
{
u8 *data = sg_virt(&buf->urb->sg[0]);
DECLARE_COMPLETION_ONSTACK(cmpl);
__le32 info;
u32 val;
int err;
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);
buf->len = MT_CMD_HDR_LEN + len + sizeof(info);
err = mt76u_submit_buf(&dev->mt76, USB_DIR_OUT,
MT_EP_OUT_INBAND_CMD,
buf, GFP_KERNEL,
mt76u_mcu_complete_urb, &cmpl);
if (err < 0)
return err;
if (!wait_for_completion_timeout(&cmpl,
msecs_to_jiffies(1000))) {
dev_err(dev->mt76.dev, "firmware upload timed out\n");
usb_kill_urb(buf->urb);
return -ETIMEDOUT;
}
if (mt76u_urb_error(buf->urb)) {
dev_err(dev->mt76.dev, "firmware upload failed: %d\n",
buf->urb->status);
return buf->urb->status;
}
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 err, len, pos = 0, max_len = max_payload - 8;
struct mt76u_buf buf;
err = mt76u_buf_alloc(&dev->mt76, &buf, 1, max_payload, max_payload,
GFP_KERNEL);
if (err < 0)
return err;
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);
}
mt76u_buf_free(&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 = {
.mcu_msg_alloc = mt76x02u_mcu_msg_alloc,
.mcu_send_msg = mt76x02u_mcu_send_msg,
.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_LICENSE("Dual BSD/GPL");