text: // SPDX-License-Identifier: ISC
  /* Copyright (C) 2022 MediaTek Inc.
   *
   * Author: Lorenzo Bianconi <lorenzo@kernel.org>
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/usb.h>
  
  #include "mt7921.h"
  #include "mcu.h"
  #include "mac.h"
  
  static const struct usb_device_id mt7921u_device_table[] = {
  	{ USB_DEVICE_AND_INTERFACE_INFO(0x0e8d, 0x7961, 0xff, 0xff, 0xff) },
  	{ },
  };
  
  static u32 mt7921u_rr(struct mt76_dev *dev, u32 addr)
  {
  	u32 ret;
  
  	mutex_lock(&dev->usb.usb_ctrl_mtx);
  	ret = ___mt76u_rr(dev, MT_VEND_READ_EXT,
  			  USB_DIR_IN | MT_USB_TYPE_VENDOR, addr);
  	mutex_unlock(&dev->usb.usb_ctrl_mtx);
  
  	return ret;
  }
  
  static void mt7921u_wr(struct mt76_dev *dev, u32 addr, u32 val)
  {
  	mutex_lock(&dev->usb.usb_ctrl_mtx);
  	___mt76u_wr(dev, MT_VEND_WRITE_EXT,
  		    USB_DIR_OUT | MT_USB_TYPE_VENDOR, addr, val);
  	mutex_unlock(&dev->usb.usb_ctrl_mtx);
  }
  
  static u32 mt7921u_rmw(struct mt76_dev *dev, u32 addr,
  		       u32 mask, u32 val)
  {
  	mutex_lock(&dev->usb.usb_ctrl_mtx);
  	val |= ___mt76u_rr(dev, MT_VEND_READ_EXT,
  			   USB_DIR_IN | MT_USB_TYPE_VENDOR, addr) & ~mask;
  	___mt76u_wr(dev, MT_VEND_WRITE_EXT,
  		    USB_DIR_OUT | MT_USB_TYPE_VENDOR, addr, val);
  	mutex_unlock(&dev->usb.usb_ctrl_mtx);
  
  	return val;
  }
  
  static void mt7921u_copy(struct mt76_dev *dev, u32 offset,
  			 const void *data, int len)
  {
  	struct mt76_usb *usb = &dev->usb;
  	int ret, i = 0, batch_len;
  	const u8 *val = data;
  
  	len = round_up(len, 4);
  
  	mutex_lock(&usb->usb_ctrl_mtx);
  	while (i < len) {
  		batch_len = min_t(int, usb->data_len, len - i);
  		memcpy(usb->data, val + i, batch_len);
  		ret = __mt76u_vendor_request(dev, MT_VEND_WRITE_EXT,
  					     USB_DIR_OUT | MT_USB_TYPE_VENDOR,
  					     (offset + i) >> 16, offset + i,
  					     usb->data, batch_len);
  		if (ret < 0)
  			break;
  
  		i += batch_len;
  	}
  	mutex_unlock(&usb->usb_ctrl_mtx);
  }
  
  int mt7921u_mcu_power_on(struct mt7921_dev *dev)
  {
  	int ret;
  
  	ret = mt76u_vendor_request(&dev->mt76, MT_VEND_POWER_ON,
  				   USB_DIR_OUT | MT_USB_TYPE_VENDOR,
  				   0x0, 0x1, NULL, 0);
  	if (ret)
  		return ret;
  
  	if (!mt76_poll_msec(dev, MT_CONN_ON_MISC, MT_TOP_MISC2_FW_PWR_ON,
  			    MT_TOP_MISC2_FW_PWR_ON, 500)) {
  		dev_err(dev->mt76.dev, "Timeout for power on\n");
  		ret = -EIO;
  	}
  
  	return ret;
  }
  
  static int
  mt7921u_mcu_send_message(struct mt76_dev *mdev, struct sk_buff *skb,
  			 int cmd, int *seq)
  {
  	struct mt7921_dev *dev = container_of(mdev, struct mt7921_dev, mt76);
  	u32 pad, ep;
  	int ret;
  
  	ret = mt7921_mcu_fill_message(mdev, skb, cmd, seq);
  	if (ret)
  		return ret;
  
  	if (cmd != MCU_CMD(FW_SCATTER))
  		ep = MT_EP_OUT_INBAND_CMD;
  	else
  		ep = MT_EP_OUT_AC_BE;
  
  	mt7921_skb_add_usb_sdio_hdr(dev, skb, 0);
  	pad = round_up(skb->len, 4) + 4 - skb->len;
  	__skb_put_zero(skb, pad);
  
  	ret = mt76u_bulk_msg(&dev->mt76, skb->data, skb->len, NULL,
  			     1000, ep);
  	dev_kfree_skb(skb);
  
  	return ret;
  }
  
  static int mt7921u_mcu_init(struct mt7921_dev *dev)
  {
  	static const struct mt76_mcu_ops mcu_ops = {
  		.headroom = MT_SDIO_HDR_SIZE + sizeof(struct mt7921_mcu_txd),
  		.tailroom = MT_USB_TAIL_SIZE,
  		.mcu_skb_send_msg = mt7921u_mcu_send_message,
  		.mcu_parse_response = mt7921_mcu_parse_response,
  		.mcu_restart = mt76_connac_mcu_restart,
  	};
  	int ret;
  
  	dev->mt76.mcu_ops = &mcu_ops;
  
  	mt76_set(dev, MT_UDMA_TX_QSEL, MT_FW_DL_EN);
  	ret = mt7921_run_firmware(dev);
  	if (ret)
  		return ret;
  
  	set_bit(MT76_STATE_MCU_RUNNING, &dev->mphy.state);
  	mt76_clear(dev, MT_UDMA_TX_QSEL, MT_FW_DL_EN);
  
  	return 0;
  }
  
  static void mt7921u_stop(struct ieee80211_hw *hw)
  {
  	struct mt7921_dev *dev = mt7921_hw_dev(hw);
  
  	mt76u_stop_tx(&dev->mt76);
  	mt7921_stop(hw);
  }
  
  static void mt7921u_cleanup(struct mt7921_dev *dev)
  {
  	clear_bit(MT76_STATE_INITIALIZED, &dev->mphy.state);
  	mt7921u_wfsys_reset(dev);
  	mt7921_mcu_exit(dev);
  	mt76u_queues_deinit(&dev->mt76);
  }
  
  static int mt7921u_probe(struct usb_interface *usb_intf,
  			 const struct usb_device_id *id)
  {
  	static const struct mt76_driver_ops drv_ops = {
  		.txwi_size = MT_SDIO_TXD_SIZE,
  		.drv_flags = MT_DRV_RX_DMA_HDR | MT_DRV_HW_MGMT_TXQ,
  		.survey_flags = SURVEY_INFO_TIME_TX |
  				SURVEY_INFO_TIME_RX |
  				SURVEY_INFO_TIME_BSS_RX,
  		.tx_prepare_skb = mt7921_usb_sdio_tx_prepare_skb,
  		.tx_complete_skb = mt7921_usb_sdio_tx_complete_skb,
  		.tx_status_data = mt7921_usb_sdio_tx_status_data,
  		.rx_skb = mt7921_queue_rx_skb,
  		.sta_ps = mt7921_sta_ps,
  		.sta_add = mt7921_mac_sta_add,
  		.sta_assoc = mt7921_mac_sta_assoc,
  		.sta_remove = mt7921_mac_sta_remove,
  		.update_survey = mt7921_update_channel,
  	};
  	static const struct mt7921_hif_ops hif_ops = {
  		.mcu_init = mt7921u_mcu_init,
  		.init_reset = mt7921u_init_reset,
  		.reset = mt7921u_mac_reset,
  	};
  	static struct mt76_bus_ops bus_ops = {
  		.rr = mt7921u_rr,
  		.wr = mt7921u_wr,
  		.rmw = mt7921u_rmw,
  		.read_copy = mt76u_read_copy,
  		.write_copy = mt7921u_copy,
  		.type = MT76_BUS_USB,
  	};
  	struct usb_device *udev = interface_to_usbdev(usb_intf);
  	struct ieee80211_ops *ops;
  	struct ieee80211_hw *hw;
  	struct mt7921_dev *dev;
  	struct mt76_dev *mdev;
  	int ret;
  
  	ops = devm_kmemdup(&usb_intf->dev, &mt7921_ops, sizeof(mt7921_ops),
  			   GFP_KERNEL);
  	if (!ops)
  		return -ENOMEM;
  
  	ops->stop = mt7921u_stop;
  
  	mdev = mt76_alloc_device(&usb_intf->dev, sizeof(*dev), ops, &drv_ops);
  	if (!mdev)
  		return -ENOMEM;
  
  	dev = container_of(mdev, struct mt7921_dev, mt76);
  	dev->hif_ops = &hif_ops;
  
  	udev = usb_get_dev(udev);
  	usb_reset_device(udev);
  
  	usb_set_intfdata(usb_intf, dev);
  
  	ret = __mt76u_init(mdev, usb_intf, &bus_ops);
  	if (ret < 0)
  		goto error;
  
  	mdev->rev = (mt76_rr(dev, MT_HW_CHIPID) << 16) |
  		    (mt76_rr(dev, MT_HW_REV) & 0xff);
  	dev_dbg(mdev->dev, "ASIC revision: %04x\n", mdev->rev);
  
  	if (mt76_get_field(dev, MT_CONN_ON_MISC, MT_TOP_MISC2_FW_N9_RDY)) {
  		ret = mt7921u_wfsys_reset(dev);
  		if (ret)
  			goto error;
  	}
  
  	ret = mt7921u_mcu_power_on(dev);
  	if (ret)
  		goto error;
  
  	ret = mt76u_alloc_mcu_queue(&dev->mt76);
  	if (ret)
  		goto error;
  
  	ret = mt76u_alloc_queues(&dev->mt76);
  	if (ret)
  		goto error;
  
  	ret = mt7921u_dma_init(dev);
  	if (ret)
  		return ret;
  
  	hw = mt76_hw(dev);
  	/* check hw sg support in order to enable AMSDU */
  	hw->max_tx_fragments = mdev->usb.sg_en ? MT_HW_TXP_MAX_BUF_NUM : 1;
  
  	ret = mt7921_register_device(dev);
  	if (ret)
  		goto error;
  
  	return 0;
  
  error:
  	mt76u_queues_deinit(&dev->mt76);
  
  	usb_set_intfdata(usb_intf, NULL);
  	usb_put_dev(interface_to_usbdev(usb_intf));
  
  	mt76_free_device(&dev->mt76);
  
  	return ret;
  }
  
  static void mt7921u_disconnect(struct usb_interface *usb_intf)
  {
  	struct mt7921_dev *dev = usb_get_intfdata(usb_intf);
  
  	cancel_work_sync(&dev->init_work);
  	if (!test_bit(MT76_STATE_INITIALIZED, &dev->mphy.state))
  		return;
  
  	mt76_unregister_device(&dev->mt76);
  	mt7921u_cleanup(dev);
  
  	usb_set_intfdata(usb_intf, NULL);
  	usb_put_dev(interface_to_usbdev(usb_intf));
  
  	mt76_free_device(&dev->mt76);
  }
  
  MODULE_DEVICE_TABLE(usb, mt7921u_device_table);
  MODULE_FIRMWARE(MT7921_FIRMWARE_WM);
  MODULE_FIRMWARE(MT7921_ROM_PATCH);
  
  static struct usb_driver mt7921u_driver = {
  	.name		= KBUILD_MODNAME,
  	.id_table	= mt7921u_device_table,
  	.probe		= mt7921u_probe,
  	.disconnect	= mt7921u_disconnect,
  	.soft_unbind	= 1,
  	.disable_hub_initiated_lpm = 1,
  };
  module_usb_driver(mt7921u_driver);
  
  MODULE_AUTHOR("Lorenzo Bianconi <lorenzo@kernel.org>");
  MODULE_LICENSE("Dual BSD/GPL");
  