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From:   Deren Wu <deren.wu@mediatek.com>
To:     Felix Fietkau <nbd@nbd.name>, Lorenzo Bianconi <lorenzo@kernel.org>
CC:     Sean Wang <sean.wang@mediatek.com>,
        Ryder Lee <ryder.lee@mediatek.com>,
        Shayne Chen <shayne.chen@mediatek.com>,
        linux-wireless <linux-wireless@vger.kernel.org>,
        linux-mediatek <linux-mediatek@lists.infradead.org>,
        Deren Wu <deren.wu@mediatek.com>
Subject: [PATCH 14/17] wifi: mt76: mt7925: add usb.c
Date:   Tue, 1 Aug 2023 22:34:30 +0800
Message-ID: <cb5f9a18e60dab93665b619440c3f50af5b4d9ac.1690864199.git.deren.wu@mediatek.com>
In-Reply-To: <cover.1690864199.git.deren.wu@mediatek.com>
References: <cover.1690864199.git.deren.wu@mediatek.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

(Patches split into one patch per file for easier review, but the final
commit will be one big patch. See the cover letter for more info.)

Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
---
 .../net/wireless/mediatek/mt76/mt7925/usb.c   | 340 ++++++++++++++++++
 1 file changed, 340 insertions(+)
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7925/usb.c

diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/usb.c b/drivers/net/wireless/mediatek/mt76/mt7925/usb.c
new file mode 100644
index 000000000000..6cbcecabf40e
--- /dev/null
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/usb.c
@@ -0,0 +1,340 @@
+// SPDX-License-Identifier: ISC
+/* Copyright (C) 2023 MediaTek Inc. */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+
+#include "mt7925.h"
+#include "mcu.h"
+#include "mac.h"
+
+static const struct usb_device_id mt7925u_device_table[] = {
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x0e8d, 0x7925, 0xff, 0xff, 0xff),
+		.driver_info = (kernel_ulong_t)MT7925_FIRMWARE_WM },
+	{ },
+};
+
+static int
+mt7925u_mcu_send_message(struct mt76_dev *mdev, struct sk_buff *skb,
+			 int cmd, int *seq)
+{
+	struct mt792x_dev *dev = container_of(mdev, struct mt792x_dev, mt76);
+	u32 pad, ep;
+	int ret;
+
+	ret = mt7925_mcu_fill_message(mdev, skb, cmd, seq);
+	if (ret)
+		return ret;
+
+	mdev->mcu.timeout = 3 * HZ;
+
+	if (cmd != MCU_CMD(FW_SCATTER))
+		ep = MT_EP_OUT_INBAND_CMD;
+	else
+		ep = MT_EP_OUT_AC_BE;
+
+	mt7925_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 mt7925u_mcu_init(struct mt792x_dev *dev)
+{
+	static const struct mt76_mcu_ops mcu_ops = {
+		.headroom = MT_SDIO_HDR_SIZE +
+			    sizeof(struct mt76_connac2_mcu_txd),
+		.tailroom = MT_USB_TAIL_SIZE,
+		.mcu_skb_send_msg = mt7925u_mcu_send_message,
+		.mcu_parse_response = mt7925_mcu_parse_response,
+	};
+	int ret;
+
+	dev->mt76.mcu_ops = &mcu_ops;
+
+	mt76_set(dev, MT_UDMA_TX_QSEL, MT_FW_DL_EN);
+	ret = mt7925_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 mt7925u_stop(struct ieee80211_hw *hw)
+{
+	struct mt792x_dev *dev = mt792x_hw_dev(hw);
+
+	mt76u_stop_tx(&dev->mt76);
+	mt7925_stop(hw);
+}
+
+static int mt7925u_mac_reset(struct mt792x_dev *dev)
+{
+	int err;
+
+	mt76_txq_schedule_all(&dev->mphy);
+	mt76_worker_disable(&dev->mt76.tx_worker);
+
+	set_bit(MT76_RESET, &dev->mphy.state);
+	set_bit(MT76_MCU_RESET, &dev->mphy.state);
+
+	wake_up(&dev->mt76.mcu.wait);
+	skb_queue_purge(&dev->mt76.mcu.res_q);
+
+	mt76u_stop_rx(&dev->mt76);
+	mt76u_stop_tx(&dev->mt76);
+
+	mt792xu_wfsys_reset(dev);
+
+	clear_bit(MT76_MCU_RESET, &dev->mphy.state);
+	err = mt76u_resume_rx(&dev->mt76);
+	if (err)
+		goto out;
+
+	err = mt792xu_mcu_power_on(dev);
+	if (err)
+		goto out;
+
+	err = mt792xu_dma_init(dev, false);
+	if (err)
+		goto out;
+
+	mt76_wr(dev, MT_SWDEF_MODE, MT_SWDEF_NORMAL_MODE);
+	mt76_set(dev, MT_UDMA_TX_QSEL, MT_FW_DL_EN);
+
+	err = mt7925_run_firmware(dev);
+	if (err)
+		goto out;
+
+	mt76_clear(dev, MT_UDMA_TX_QSEL, MT_FW_DL_EN);
+
+	err = mt7925_mcu_set_eeprom(dev);
+	if (err)
+		goto out;
+
+	err = mt7925_mac_init(dev);
+	if (err)
+		goto out;
+
+	err = __mt7925_start(&dev->phy);
+out:
+	clear_bit(MT76_RESET, &dev->mphy.state);
+
+	mt76_worker_enable(&dev->mt76.tx_worker);
+
+	return err;
+}
+
+static int mt7925u_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 |
+			     MT_DRV_AMSDU_OFFLOAD,
+		.survey_flags = SURVEY_INFO_TIME_TX |
+				SURVEY_INFO_TIME_RX |
+				SURVEY_INFO_TIME_BSS_RX,
+		.tx_prepare_skb = mt7925_usb_sdio_tx_prepare_skb,
+		.tx_complete_skb = mt7925_usb_sdio_tx_complete_skb,
+		.tx_status_data = mt7925_usb_sdio_tx_status_data,
+		.rx_skb = mt7925_queue_rx_skb,
+		.rx_check = mt7925_rx_check,
+		.sta_add = mt7925_mac_sta_add,
+		.sta_assoc = mt7925_mac_sta_assoc,
+		.sta_remove = mt7925_mac_sta_remove,
+		.update_survey = mt792x_update_channel,
+	};
+	static const struct mt792x_hif_ops hif_ops = {
+		.mcu_init = mt7925u_mcu_init,
+		.init_reset = mt792xu_init_reset,
+		.reset = mt7925u_mac_reset,
+	};
+	static struct mt76_bus_ops bus_ops = {
+		.rr = mt792xu_rr,
+		.wr = mt792xu_wr,
+		.rmw = mt792xu_rmw,
+		.read_copy = mt76u_read_copy,
+		.write_copy = mt792xu_copy,
+		.type = MT76_BUS_USB,
+	};
+	struct usb_device *udev = interface_to_usbdev(usb_intf);
+	struct ieee80211_ops *ops;
+	struct ieee80211_hw *hw;
+	struct mt792x_dev *dev;
+	struct mt76_dev *mdev;
+	u8 features;
+	int ret;
+
+	ops = mt792x_get_mac80211_ops(&usb_intf->dev, &mt7925_ops,
+				      (void *)id->driver_info, &features);
+	if (!ops)
+		return -ENOMEM;
+
+	ops->stop = mt7925u_stop;
+
+	mdev = mt76_alloc_device(&usb_intf->dev, sizeof(*dev), ops, &drv_ops);
+	if (!mdev)
+		return -ENOMEM;
+
+	dev = container_of(mdev, struct mt792x_dev, mt76);
+	dev->fw_features = features;
+	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 = mt792xu_wfsys_reset(dev);
+		if (ret)
+			goto error;
+	}
+
+	ret = mt792xu_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 = mt792xu_dma_init(dev, false);
+	if (ret)
+		goto error;
+
+	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 = mt7925_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;
+}
+
+#ifdef CONFIG_PM
+static int mt7925u_suspend(struct usb_interface *intf, pm_message_t state)
+{
+	struct mt792x_dev *dev = usb_get_intfdata(intf);
+	struct mt76_connac_pm *pm = &dev->pm;
+	int err;
+
+	pm->suspended = true;
+	flush_work(&dev->reset_work);
+
+	err = mt76_connac_mcu_set_hif_suspend(&dev->mt76, true);
+	if (err)
+		goto failed;
+
+	mt76u_stop_rx(&dev->mt76);
+	mt76u_stop_tx(&dev->mt76);
+
+	return 0;
+
+failed:
+	pm->suspended = false;
+
+	if (err < 0)
+		mt792x_reset(&dev->mt76);
+
+	return err;
+}
+
+static int mt7925u_resume(struct usb_interface *intf)
+{
+	struct mt792x_dev *dev = usb_get_intfdata(intf);
+	struct mt76_connac_pm *pm = &dev->pm;
+	bool reinit = true;
+	int err, i;
+
+	for (i = 0; i < 10; i++) {
+		u32 val = mt76_rr(dev, MT_WF_SW_DEF_CR_USB_MCU_EVENT);
+
+		if (!(val & MT_WF_SW_SER_TRIGGER_SUSPEND)) {
+			reinit = false;
+			break;
+		}
+		if (val & MT_WF_SW_SER_DONE_SUSPEND) {
+			mt76_wr(dev, MT_WF_SW_DEF_CR_USB_MCU_EVENT, 0);
+			break;
+		}
+
+		msleep(20);
+	}
+
+	if (reinit || mt792x_dma_need_reinit(dev)) {
+		err = mt792xu_dma_init(dev, true);
+		if (err)
+			goto failed;
+	}
+
+	err = mt76u_resume_rx(&dev->mt76);
+	if (err < 0)
+		goto failed;
+
+	err = mt76_connac_mcu_set_hif_suspend(&dev->mt76, false);
+failed:
+	pm->suspended = false;
+
+	if (err < 0)
+		mt792x_reset(&dev->mt76);
+
+	return err;
+}
+#endif /* CONFIG_PM */
+
+MODULE_DEVICE_TABLE(usb, mt7925u_device_table);
+MODULE_FIRMWARE(MT7925_FIRMWARE_WM);
+MODULE_FIRMWARE(MT7925_ROM_PATCH);
+
+static struct usb_driver mt7925u_driver = {
+	.name		= KBUILD_MODNAME,
+	.id_table	= mt7925u_device_table,
+	.probe		= mt7925u_probe,
+	.disconnect	= mt792xu_disconnect,
+#ifdef CONFIG_PM
+	.suspend	= mt7925u_suspend,
+	.resume		= mt7925u_resume,
+	.reset_resume	= mt7925u_resume,
+#endif /* CONFIG_PM */
+	.soft_unbind	= 1,
+	.disable_hub_initiated_lpm = 1,
+};
+module_usb_driver(mt7925u_driver);
+
+MODULE_AUTHOR("Lorenzo Bianconi <lorenzo@kernel.org>");
+MODULE_LICENSE("Dual BSD/GPL");
-- 
2.18.0