1 files changed, 309 insertions, 0 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/mt792x_usb.c b/drivers/net/wireless/mediatek/mt76/mt792x_usb.c
new file mode 100644
index 000000000000..20e7f9c7c88c
--- /dev/null
+++ b/drivers/net/wireless/mediatek/mt76/mt792x_usb.c
@@ -0,0 +1,309 @@
+// SPDX-License-Identifier: ISC
+/* Copyright (C) 2023 MediaTek Inc.
+ *
+ * Author: Lorenzo Bianconi <lorenzo@kernel.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+
+#include "mt792x.h"
+#include "mt76_connac2_mac.h"
+
+u32 mt792xu_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;
+}
+EXPORT_SYMBOL_GPL(mt792xu_rr);
+
+void mt792xu_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);
+}
+EXPORT_SYMBOL_GPL(mt792xu_wr);
+
+u32 mt792xu_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;
+}
+EXPORT_SYMBOL_GPL(mt792xu_rmw);
+
+void mt792xu_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);
+}
+EXPORT_SYMBOL_GPL(mt792xu_copy);
+
+int mt792xu_mcu_power_on(struct mt792x_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;
+}
+EXPORT_SYMBOL_GPL(mt792xu_mcu_power_on);
+
+static void mt792xu_cleanup(struct mt792x_dev *dev)
+{
+	clear_bit(MT76_STATE_INITIALIZED, &dev->mphy.state);
+	mt792xu_wfsys_reset(dev);
+	skb_queue_purge(&dev->mt76.mcu.res_q);
+	mt76u_queues_deinit(&dev->mt76);
+}
+
+static u32 mt792xu_uhw_rr(struct mt76_dev *dev, u32 addr)
+{
+	u32 ret;
+
+	mutex_lock(&dev->usb.usb_ctrl_mtx);
+	ret = ___mt76u_rr(dev, MT_VEND_DEV_MODE,
+			  USB_DIR_IN | MT_USB_TYPE_UHW_VENDOR, addr);
+	mutex_unlock(&dev->usb.usb_ctrl_mtx);
+
+	return ret;
+}
+
+static void mt792xu_uhw_wr(struct mt76_dev *dev, u32 addr, u32 val)
+{
+	mutex_lock(&dev->usb.usb_ctrl_mtx);
+	___mt76u_wr(dev, MT_VEND_WRITE,
+		    USB_DIR_OUT | MT_USB_TYPE_UHW_VENDOR, addr, val);
+	mutex_unlock(&dev->usb.usb_ctrl_mtx);
+}
+
+static void mt792xu_dma_prefetch(struct mt792x_dev *dev)
+{
+	mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(0),
+		 MT_WPDMA0_MAX_CNT_MASK, 4);
+	mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(0),
+		 MT_WPDMA0_BASE_PTR_MASK, 0x80);
+
+	mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(1),
+		 MT_WPDMA0_MAX_CNT_MASK, 4);
+	mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(1),
+		 MT_WPDMA0_BASE_PTR_MASK, 0xc0);
+
+	mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(2),
+		 MT_WPDMA0_MAX_CNT_MASK, 4);
+	mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(2),
+		 MT_WPDMA0_BASE_PTR_MASK, 0x100);
+
+	mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(3),
+		 MT_WPDMA0_MAX_CNT_MASK, 4);
+	mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(3),
+		 MT_WPDMA0_BASE_PTR_MASK, 0x140);
+
+	mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(4),
+		 MT_WPDMA0_MAX_CNT_MASK, 4);
+	mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(4),
+		 MT_WPDMA0_BASE_PTR_MASK, 0x180);
+
+	mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(16),
+		 MT_WPDMA0_MAX_CNT_MASK, 4);
+	mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(16),
+		 MT_WPDMA0_BASE_PTR_MASK, 0x280);
+
+	mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(17),
+		 MT_WPDMA0_MAX_CNT_MASK, 4);
+	mt76_rmw(dev, MT_UWFDMA0_TX_RING_EXT_CTRL(17),
+		 MT_WPDMA0_BASE_PTR_MASK,  0x2c0);
+}
+
+static void mt792xu_wfdma_init(struct mt792x_dev *dev)
+{
+	mt792xu_dma_prefetch(dev);
+
+	mt76_clear(dev, MT_UWFDMA0_GLO_CFG, MT_WFDMA0_GLO_CFG_OMIT_RX_INFO);
+	mt76_set(dev, MT_UWFDMA0_GLO_CFG,
+		 MT_WFDMA0_GLO_CFG_OMIT_TX_INFO |
+		 MT_WFDMA0_GLO_CFG_OMIT_RX_INFO_PFET2 |
+		 MT_WFDMA0_GLO_CFG_FW_DWLD_BYPASS_DMASHDL |
+		 MT_WFDMA0_GLO_CFG_TX_DMA_EN |
+		 MT_WFDMA0_GLO_CFG_RX_DMA_EN);
+
+	/* disable dmashdl */
+	mt76_clear(dev, MT_UWFDMA0_GLO_CFG_EXT0,
+		   MT_WFDMA0_CSR_TX_DMASHDL_ENABLE);
+	mt76_set(dev, MT_DMASHDL_SW_CONTROL, MT_DMASHDL_DMASHDL_BYPASS);
+
+	mt76_set(dev, MT_WFDMA_DUMMY_CR, MT_WFDMA_NEED_REINIT);
+}
+
+static int mt792xu_dma_rx_evt_ep4(struct mt792x_dev *dev)
+{
+	if (!mt76_poll(dev, MT_UWFDMA0_GLO_CFG,
+		       MT_WFDMA0_GLO_CFG_RX_DMA_BUSY, 0, 1000))
+		return -ETIMEDOUT;
+
+	mt76_clear(dev, MT_UWFDMA0_GLO_CFG, MT_WFDMA0_GLO_CFG_RX_DMA_EN);
+	mt76_set(dev, MT_WFDMA_HOST_CONFIG,
+		 MT_WFDMA_HOST_CONFIG_USB_RXEVT_EP4_EN);
+	mt76_set(dev, MT_UWFDMA0_GLO_CFG, MT_WFDMA0_GLO_CFG_RX_DMA_EN);
+
+	return 0;
+}
+
+static void mt792xu_epctl_rst_opt(struct mt792x_dev *dev, bool reset)
+{
+	u32 val;
+
+	/* usb endpoint reset opt
+	 * bits[4,9]: out blk ep 4-9
+	 * bits[20,21]: in blk ep 4-5
+	 * bits[22]: in int ep 6
+	 */
+	val = mt792xu_uhw_rr(&dev->mt76, MT_SSUSB_EPCTL_CSR_EP_RST_OPT);
+	if (reset)
+		val |= GENMASK(9, 4) | GENMASK(22, 20);
+	else
+		val &= ~(GENMASK(9, 4) | GENMASK(22, 20));
+	mt792xu_uhw_wr(&dev->mt76, MT_SSUSB_EPCTL_CSR_EP_RST_OPT, val);
+}
+
+int mt792xu_dma_init(struct mt792x_dev *dev, bool resume)
+{
+	int err;
+
+	mt792xu_wfdma_init(dev);
+
+	mt76_clear(dev, MT_UDMA_WLCFG_0, MT_WL_RX_FLUSH);
+
+	mt76_set(dev, MT_UDMA_WLCFG_0,
+		 MT_WL_RX_EN | MT_WL_TX_EN |
+		 MT_WL_RX_MPSZ_PAD0 | MT_TICK_1US_EN);
+	mt76_clear(dev, MT_UDMA_WLCFG_0,
+		   MT_WL_RX_AGG_TO | MT_WL_RX_AGG_LMT);
+	mt76_clear(dev, MT_UDMA_WLCFG_1, MT_WL_RX_AGG_PKT_LMT);
+
+	if (resume)
+		return 0;
+
+	err = mt792xu_dma_rx_evt_ep4(dev);
+	if (err)
+		return err;
+
+	mt792xu_epctl_rst_opt(dev, false);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mt792xu_dma_init);
+
+int mt792xu_wfsys_reset(struct mt792x_dev *dev)
+{
+	u32 val;
+	int i;
+
+	mt792xu_epctl_rst_opt(dev, false);
+
+	val = mt792xu_uhw_rr(&dev->mt76, MT_CBTOP_RGU_WF_SUBSYS_RST);
+	val |= MT_CBTOP_RGU_WF_SUBSYS_RST_WF_WHOLE_PATH;
+	mt792xu_uhw_wr(&dev->mt76, MT_CBTOP_RGU_WF_SUBSYS_RST, val);
+
+	usleep_range(10, 20);
+
+	val = mt792xu_uhw_rr(&dev->mt76, MT_CBTOP_RGU_WF_SUBSYS_RST);
+	val &= ~MT_CBTOP_RGU_WF_SUBSYS_RST_WF_WHOLE_PATH;
+	mt792xu_uhw_wr(&dev->mt76, MT_CBTOP_RGU_WF_SUBSYS_RST, val);
+
+	mt792xu_uhw_wr(&dev->mt76, MT_UDMA_CONN_INFRA_STATUS_SEL, 0);
+	for (i = 0; i < MT792x_WFSYS_INIT_RETRY_COUNT; i++) {
+		val = mt792xu_uhw_rr(&dev->mt76, MT_UDMA_CONN_INFRA_STATUS);
+		if (val & MT_UDMA_CONN_WFSYS_INIT_DONE)
+			break;
+
+		msleep(100);
+	}
+
+	if (i == MT792x_WFSYS_INIT_RETRY_COUNT)
+		return -ETIMEDOUT;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mt792xu_wfsys_reset);
+
+int mt792xu_init_reset(struct mt792x_dev *dev)
+{
+	set_bit(MT76_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_RESET, &dev->mphy.state);
+
+	return mt76u_resume_rx(&dev->mt76);
+}
+EXPORT_SYMBOL_GPL(mt792xu_init_reset);
+
+void mt792xu_disconnect(struct usb_interface *usb_intf)
+{
+	struct mt792x_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);
+	mt792xu_cleanup(dev);
+
+	usb_set_intfdata(usb_intf, NULL);
+	usb_put_dev(interface_to_usbdev(usb_intf));
+
+	mt76_free_device(&dev->mt76);
+}
+EXPORT_SYMBOL_GPL(mt792xu_disconnect);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Lorenzo Bianconi <lorenzo@kernel.org>");