path: root/drivers/net/wireless/mediatek/mt76/usb.c

// SPDX-License-Identifier: ISC
/*
 * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
 */

#include <linux/module.h>
#include "mt76.h"
#include "usb_trace.h"
#include "dma.h"

#define MT_VEND_REQ_MAX_RETRY	10
#define MT_VEND_REQ_TOUT_MS	300

static bool disable_usb_sg;
module_param_named(disable_usb_sg, disable_usb_sg, bool, 0644);
MODULE_PARM_DESC(disable_usb_sg, "Disable usb scatter-gather support");

static int __mt76u_vendor_request(struct mt76_dev *dev, u8 req,
				  u8 req_type, u16 val, u16 offset,
				  void *buf, size_t len)
{
	struct usb_interface *uintf = to_usb_interface(dev->dev);
	struct usb_device *udev = interface_to_usbdev(uintf);
	unsigned int pipe;
	int i, ret;

	lockdep_assert_held(&dev->usb.usb_ctrl_mtx);

	pipe = (req_type & USB_DIR_IN) ? usb_rcvctrlpipe(udev, 0)
				       : usb_sndctrlpipe(udev, 0);
	for (i = 0; i < MT_VEND_REQ_MAX_RETRY; i++) {
		if (test_bit(MT76_REMOVED, &dev->phy.state))
			return -EIO;

		ret = usb_control_msg(udev, pipe, req, req_type, val,
				      offset, buf, len, MT_VEND_REQ_TOUT_MS);
		if (ret == -ENODEV)
			set_bit(MT76_REMOVED, &dev->phy.state);
		if (ret >= 0 || ret == -ENODEV)
			return ret;
		usleep_range(5000, 10000);
	}

	dev_err(dev->dev, "vendor request req:%02x off:%04x failed:%d\n",
		req, offset, ret);
	return ret;
}

int mt76u_vendor_request(struct mt76_dev *dev, u8 req,
			 u8 req_type, u16 val, u16 offset,
			 void *buf, size_t len)
{
	int ret;

	mutex_lock(&dev->usb.usb_ctrl_mtx);
	ret = __mt76u_vendor_request(dev, req, req_type,
				     val, offset, buf, len);
	trace_usb_reg_wr(dev, offset, val);
	mutex_unlock(&dev->usb.usb_ctrl_mtx);

	return ret;
}
EXPORT_SYMBOL_GPL(mt76u_vendor_request);

static u32 ___mt76u_rr(struct mt76_dev *dev, u8 req, u32 addr)
{
	struct mt76_usb *usb = &dev->usb;
	u32 data = ~0;
	int ret;

	ret = __mt76u_vendor_request(dev, req,
				     USB_DIR_IN | USB_TYPE_VENDOR,
				     addr >> 16, addr, &usb->reg_val,
				     sizeof(__le32));
	if (ret == sizeof(__le32))
		data = le32_to_cpu(usb->reg_val);
	trace_usb_reg_rr(dev, addr, data);

	return data;
}

static u32 __mt76u_rr(struct mt76_dev *dev, u32 addr)
{
	u8 req;

	switch (addr & MT_VEND_TYPE_MASK) {
	case MT_VEND_TYPE_EEPROM:
		req = MT_VEND_READ_EEPROM;
		break;
	case MT_VEND_TYPE_CFG:
		req = MT_VEND_READ_CFG;
		break;
	default:
		req = MT_VEND_MULTI_READ;
		break;
	}

	return ___mt76u_rr(dev, req, addr & ~MT_VEND_TYPE_MASK);
}

static u32 mt76u_rr(struct mt76_dev *dev, u32 addr)
{
	u32 ret;

	mutex_lock(&dev->usb.usb_ctrl_mtx);
	ret = __mt76u_rr(dev, addr);
	mutex_unlock(&dev->usb.usb_ctrl_mtx);

	return ret;
}

static u32 mt76u_rr_ext(struct mt76_dev *dev, u32 addr)
{
	u32 ret;

	mutex_lock(&dev->usb.usb_ctrl_mtx