diff --git a/drivers/net/wireless/realtek/rtw88/Kconfig b/drivers/net/wireless/realtek/rtw88/Kconfig
index 651ab56d9c6b..cdf9cb478ee2 100644
--- a/drivers/net/wireless/realtek/rtw88/Kconfig
+++ b/drivers/net/wireless/realtek/rtw88/Kconfig
@@ -16,6 +16,9 @@ config RTW88_CORE
 config RTW88_PCI
 	tristate
 
+config RTW88_SDIO
+	tristate
+
 config RTW88_USB
 	tristate
 
diff --git a/drivers/net/wireless/realtek/rtw88/Makefile b/drivers/net/wireless/realtek/rtw88/Makefile
index fe7293ee87b4..892cad60ba31 100644
--- a/drivers/net/wireless/realtek/rtw88/Makefile
+++ b/drivers/net/wireless/realtek/rtw88/Makefile
@@ -59,5 +59,8 @@ rtw88_8821cu-objs		:= rtw8821cu.o
 obj-$(CONFIG_RTW88_PCI)		+= rtw88_pci.o
 rtw88_pci-objs			:= pci.o
 
+obj-$(CONFIG_RTW88_SDIO)	+= rtw88_sdio.o
+rtw88_sdio-objs			:= sdio.o
+
 obj-$(CONFIG_RTW88_USB)		+= rtw88_usb.o
 rtw88_usb-objs			:= usb.o
diff --git a/drivers/net/wireless/realtek/rtw88/debug.h b/drivers/net/wireless/realtek/rtw88/debug.h
index 066792dd96af..a9149c6c2b48 100644
--- a/drivers/net/wireless/realtek/rtw88/debug.h
+++ b/drivers/net/wireless/realtek/rtw88/debug.h
@@ -24,6 +24,7 @@ enum rtw_debug_mask {
 	RTW_DBG_ADAPTIVITY	= 0x00008000,
 	RTW_DBG_HW_SCAN		= 0x00010000,
 	RTW_DBG_STATE		= 0x00020000,
+	RTW_DBG_SDIO		= 0x00040000,
 
 	RTW_DBG_ALL		= 0xffffffff
 };
diff --git a/drivers/net/wireless/realtek/rtw88/mac.h b/drivers/net/wireless/realtek/rtw88/mac.h
index 3172aa5ac4de..58c3dccc14bb 100644
--- a/drivers/net/wireless/realtek/rtw88/mac.h
+++ b/drivers/net/wireless/realtek/rtw88/mac.h
@@ -7,7 +7,6 @@
 
 #define RTW_HW_PORT_NUM		5
 #define cut_version_to_mask(cut) (0x1 << ((cut) + 1))
-#define SDIO_LOCAL_OFFSET	0x10250000
 #define DDMA_POLLING_COUNT	1000
 #define C2H_PKT_BUF		256
 #define REPORT_BUF		128
diff --git a/drivers/net/wireless/realtek/rtw88/reg.h b/drivers/net/wireless/realtek/rtw88/reg.h
index 8852b24d6c2a..2a2ae2081f34 100644
--- a/drivers/net/wireless/realtek/rtw88/reg.h
+++ b/drivers/net/wireless/realtek/rtw88/reg.h
@@ -87,6 +87,7 @@
 #define BIT_LTE_MUX_CTRL_PATH	BIT(26)
 #define REG_HCI_OPT_CTRL	0x0074
 #define BIT_USB_SUS_DIS		BIT(8)
+#define BIT_SDIO_PAD_E5		BIT(18)
 
 #define REG_AFE_CTRL_4		0x0078
 #define BIT_CK320M_AFE_EN	BIT(4)
@@ -185,6 +186,9 @@
 	(((x) & BIT_MASK_TXDMA_VIQ_MAP) << BIT_SHIFT_TXDMA_VIQ_MAP)
 #define REG_TXDMA_PQ_MAP	0x010C
 #define BIT_RXDMA_ARBBW_EN	BIT(0)
+#define BIT_RXSHFT_EN		BIT(1)
+#define BIT_RXDMA_AGG_EN	BIT(2)
+#define BIT_TXDMA_BW_EN		BIT(3)
 #define BIT_SHIFT_TXDMA_BEQ_MAP	8
 #define BIT_MASK_TXDMA_BEQ_MAP	0x3
 #define BIT_TXDMA_BEQ_MAP(x)                                                   \
@@ -283,10 +287,18 @@
 #define REG_H2C_TAIL		0x0248
 #define REG_H2C_READ_ADDR	0x024C
 #define REG_H2C_INFO		0x0254
+#define REG_RXDMA_AGG_PG_TH	0x0280
+#define BIT_RXDMA_AGG_PG_TH	GENMASK(7, 0)
+#define BIT_DMA_AGG_TO_V1	GENMASK(15, 8)
+#define BIT_EN_PRE_CALC		BIT(29)
 #define REG_RXPKT_NUM		0x0284
 #define BIT_RXDMA_REQ		BIT(19)
 #define BIT_RW_RELEASE		BIT(18)
 #define BIT_RXDMA_IDLE		BIT(17)
+#define REG_RXDMA_STATUS	0x0288
+#define REG_RXDMA_DPR		0x028C
+#define REG_RXDMA_MODE		0x0290
+#define BIT_DMA_MODE		BIT(1)
 #define REG_RXPKTNUM		0x02B0
 
 #define REG_INT_MIG		0x0304
diff --git a/drivers/net/wireless/realtek/rtw88/sdio.c b/drivers/net/wireless/realtek/rtw88/sdio.c
new file mode 100644
index 000000000000..915d641d9226
--- /dev/null
+++ b/drivers/net/wireless/realtek/rtw88/sdio.c
@@ -0,0 +1,1251 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/* Copyright (C) 2021 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ * Copyright (C) 2021 Jernej Skrabec <jernej.skrabec@gmail.com>
+ *
+ * Based on rtw88/pci.c:
+ *   Copyright(c) 2018-2019  Realtek Corporation
+ */
+
+#include <linux/module.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/sdio_func.h>
+#include "sdio.h"
+#include "reg.h"
+#include "tx.h"
+#include "rx.h"
+#include "fw.h"
+#include "ps.h"
+#include "debug.h"
+
+#define RTW_SDIO_INDIRECT_RW_RETRIES		50
+
+static bool rtw_sdio_is_bus_addr(u32 addr)
+{
+	return (addr & RTW_SDIO_BUS_MSK) != 0;
+}
+
+static bool rtw_sdio_bus_claim_needed(struct rtw_sdio *rtwsdio)
+{
+	return !rtwsdio->irq_thread ||
+	       rtwsdio->irq_thread != current;
+}
+
+static u32 rtw_sdio_to_bus_offset(struct rtw_dev *rtwdev, u32 addr)
+{
+	switch (addr & RTW_SDIO_BUS_MSK) {
+	case WLAN_IOREG_OFFSET:
+		addr &= WLAN_IOREG_REG_MSK;
+		addr |= FIELD_PREP(REG_SDIO_CMD_ADDR_MSK,
+				   REG_SDIO_CMD_ADDR_MAC_REG);
+		break;
+	case SDIO_LOCAL_OFFSET:
+		addr &= SDIO_LOCAL_REG_MSK;
+		addr |= FIELD_PREP(REG_SDIO_CMD_ADDR_MSK,
+				   REG_SDIO_CMD_ADDR_SDIO_REG);
+		break;
+	default:
+		rtw_warn(rtwdev, "Cannot convert addr 0x%08x to bus offset",
+			 addr);
+	}
+
+	return addr;
+}
+
+static bool rtw_sdio_use_32bit_io(struct rtw_dev *rtwdev, u32 addr)
+{
+	return IS_ALIGNED(addr, 4) && test_bit(RTW_FLAG_POWERON, rtwdev->flags);
+}
+
+static void rtw_sdio_writel(struct rtw_dev *rtwdev, u32 val, u32 addr,
+			    int *err_ret)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	u8 buf[4];
+	int i;
+
+	if (rtw_sdio_use_32bit_io(rtwdev, addr)) {
+		sdio_writel(rtwsdio->sdio_func, val, addr, err_ret);
+		return;
+	}
+
+	*(__le32 *)buf = cpu_to_le32(val);
+
+	for (i = 0; i < 4; i++) {
+		sdio_writeb(rtwsdio->sdio_func, buf[i], addr + i, err_ret);
+		if (*err_ret)
+			return;
+	}
+}
+
+static u32 rtw_sdio_readl(struct rtw_dev *rtwdev, u32 addr, int *err_ret)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	u8 buf[4];
+	int i;
+
+	if (rtw_sdio_use_32bit_io(rtwdev, addr))
+		return sdio_readl(rtwsdio->sdio_func, addr, err_ret);
+
+	for (i = 0; i < 4; i++) {
+		buf[i] = sdio_readb(rtwsdio->sdio_func, addr + i, err_ret);
+		if (*err_ret)
+			return 0;
+	}
+
+	return le32_to_cpu(*(__le32 *)buf);
+}
+
+static u8 rtw_sdio_read_indirect8(struct rtw_dev *rtwdev, u32 addr,
+				  int *err_ret)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	u32 reg_cfg, reg_data;
+	int retry;
+	u8 tmp;
+
+	reg_cfg = rtw_sdio_to_bus_offset(rtwdev, REG_SDIO_INDIRECT_REG_CFG);
+	reg_data = rtw_sdio_to_bus_offset(rtwdev, REG_SDIO_INDIRECT_REG_DATA);
+
+	rtw_sdio_writel(rtwdev, BIT(19) | addr, reg_cfg, err_ret);
+	if (*err_ret)
+		return 0;
+
+	for (retry = 0; retry < RTW_SDIO_INDIRECT_RW_RETRIES; retry++) {
+		tmp = sdio_readb(rtwsdio->sdio_func, reg_cfg + 2, err_ret);
+		if (!*err_ret && tmp & BIT(4))
+			break;
+	}
+
+	if (*err_ret)
+		return 0;
+
+	return sdio_readb(rtwsdio->sdio_func, reg_data, err_ret);
+}
+
+static int rtw_sdio_read_indirect_bytes(struct rtw_dev *rtwdev, u32 addr,
+					u8 *buf, int count)
+{
+	int i, ret;
+
+	for (i = 0; i < count; i++) {
+		buf[i] = rtw_sdio_read_indirect8(rtwdev, addr + i, &ret);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+static u32 rtw_sdio_read_indirect32(struct rtw_dev *rtwdev, u32 addr,
+				    int *err_ret)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	u32 reg_cfg, reg_data;
+	int retry;
+	u8 tmp;
+
+	reg_cfg = rtw_sdio_to_bus_offset(rtwdev, REG_SDIO_INDIRECT_REG_CFG);
+	reg_data = rtw_sdio_to_bus_offset(rtwdev, REG_SDIO_INDIRECT_REG_DATA);
+
+	rtw_sdio_writel(rtwdev, BIT(19) | BIT(17) | addr, reg_cfg, err_ret);
+	if (*err_ret)
+		return 0;
+
+	for (retry = 0; retry < RTW_SDIO_INDIRECT_RW_RETRIES; retry++) {
+		tmp = sdio_readb(rtwsdio->sdio_func, reg_cfg + 2, err_ret);
+		if (!*err_ret && (tmp & BIT(4)))
+			break;
+	}
+
+	if (*err_ret)
+		return 0;
+
+	return rtw_sdio_readl(rtwdev, reg_data, err_ret);
+}
+
+static u8 rtw_sdio_read8(struct rtw_dev *rtwdev, u32 addr)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	bool direct, bus_claim;
+	int ret;
+	u8 val;
+
+	bus_claim = rtw_sdio_bus_claim_needed(rtwsdio);
+	direct = rtw_sdio_is_bus_addr(addr);
+
+	if (bus_claim)
+		sdio_claim_host(rtwsdio->sdio_func);
+
+	if (direct) {
+		addr = rtw_sdio_to_bus_offset(rtwdev, addr);
+		val = sdio_readb(rtwsdio->sdio_func, addr, &ret);
+	} else {
+		val = rtw_sdio_read_indirect8(rtwdev, addr, &ret);
+	}
+
+	if (bus_claim)
+		sdio_release_host(rtwsdio->sdio_func);
+
+	if (ret)
+		rtw_warn(rtwdev, "sdio read8 failed (0x%x): %d", addr, ret);
+
+	return val;
+}
+
+static u16 rtw_sdio_read16(struct rtw_dev *rtwdev, u32 addr)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	bool direct, bus_claim;
+	u8 buf[2];
+	int ret;
+	u16 val;
+
+	bus_claim = rtw_sdio_bus_claim_needed(rtwsdio);
+	direct = rtw_sdio_is_bus_addr(addr);
+
+	if (bus_claim)
+		sdio_claim_host(rtwsdio->sdio_func);
+
+	if (direct) {
+		addr = rtw_sdio_to_bus_offset(rtwdev, addr);
+		buf[0] = sdio_readb(rtwsdio->sdio_func, addr, &ret);
+		if (!ret)
+			buf[1] = sdio_readb(rtwsdio->sdio_func, addr + 1, &ret);
+		val = le16_to_cpu(*(__le16 *)buf);
+	} else if (addr & 1) {
+		ret = rtw_sdio_read_indirect_bytes(rtwdev, addr, buf, 2);
+		val = le16_to_cpu(*(__le16 *)buf);
+	} else {
+		val = rtw_sdio_read_indirect32(rtwdev, addr, &ret);
+	}
+
+	if (bus_claim)
+		sdio_release_host(rtwsdio->sdio_func);
+
+	if (ret)
+		rtw_warn(rtwdev, "sdio read16 failed (0x%x): %d", addr, ret);
+
+	return val;
+}
+
+static u32 rtw_sdio_read32(struct rtw_dev *rtwdev, u32 addr)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	bool direct, bus_claim;
+	u8 buf[4];
+	u32 val;
+	int ret;
+
+	bus_claim = rtw_sdio_bus_claim_needed(rtwsdio);
+	direct = rtw_sdio_is_bus_addr(addr);
+
+	if (bus_claim)
+		sdio_claim_host(rtwsdio->sdio_func);
+
+	if (direct) {
+		addr = rtw_sdio_to_bus_offset(rtwdev, addr);
+		val = rtw_sdio_readl(rtwdev, addr, &ret);
+	} else if (addr & 3) {
+		ret = rtw_sdio_read_indirect_bytes(rtwdev, addr, buf, 4);
+		val = le32_to_cpu(*(__le32 *)buf);
+	} else {
+		val = rtw_sdio_read_indirect32(rtwdev, addr, &ret);
+	}
+
+	if (bus_claim)
+		sdio_release_host(rtwsdio->sdio_func);
+
+	if (ret)
+		rtw_warn(rtwdev, "sdio read32 failed (0x%x): %d", addr, ret);
+
+	return val;
+}
+
+static u32 rtw_sdio_to_write_address(struct rtw_dev *rtwdev, u32 addr)
+{
+	if (!rtw_sdio_is_bus_addr(addr))
+		addr |= WLAN_IOREG_OFFSET;
+
+	return rtw_sdio_to_bus_offset(rtwdev, addr);
+}
+
+static void rtw_sdio_write8(struct rtw_dev *rtwdev, u32 addr, u8 val)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	bool bus_claim;
+	int ret;
+
+	addr = rtw_sdio_to_write_address(rtwdev, addr);
+	bus_claim = rtw_sdio_bus_claim_needed(rtwsdio);
+
+	if (bus_claim)
+		sdio_claim_host(rtwsdio->sdio_func);
+
+	sdio_writeb(rtwsdio->sdio_func, val, addr, &ret);
+
+	if (bus_claim)
+		sdio_release_host(rtwsdio->sdio_func);
+
+	if (ret)
+		rtw_warn(rtwdev, "sdio write8 failed (0x%x): %d", addr, ret);
+}
+
+static void rtw_sdio_write16(struct rtw_dev *rtwdev, u32 addr, u16 val)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	bool bus_claim;
+	int ret;
+
+	addr = rtw_sdio_to_write_address(rtwdev, addr);
+	bus_claim = rtw_sdio_bus_claim_needed(rtwsdio);
+
+	if (bus_claim)
+		sdio_claim_host(rtwsdio->sdio_func);
+
+	sdio_writeb(rtwsdio->sdio_func, val, addr, &ret);
+	if (!ret)
+		sdio_writeb(rtwsdio->sdio_func, val >> 8, addr + 1, &ret);
+
+	if (bus_claim)
+		sdio_release_host(rtwsdio->sdio_func);
+
+	if (ret)
+		rtw_warn(rtwdev, "sdio write16 failed (0x%x): %d", addr, ret);
+}
+
+static void rtw_sdio_write32(struct rtw_dev *rtwdev, u32 addr, u32 val)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	bool bus_claim;
+	int ret;
+
+	addr = rtw_sdio_to_write_address(rtwdev, addr);
+	bus_claim = rtw_sdio_bus_claim_needed(rtwsdio);
+
+	if (bus_claim)
+		sdio_claim_host(rtwsdio->sdio_func);
+
+	rtw_sdio_writel(rtwdev, val, addr, &ret);
+
+	if (bus_claim)
+		sdio_release_host(rtwsdio->sdio_func);
+
+	if (ret)
+		rtw_warn(rtwdev, "sdio write32 failed (0x%x): %d", addr, ret);
+}
+
+static u32 rtw_sdio_get_tx_addr(struct rtw_dev *rtwdev, size_t size,
+				enum rtw_tx_queue_type queue)
+{
+	u32 txaddr;
+
+	switch (queue) {
+	case RTW_TX_QUEUE_BCN:
+	case RTW_TX_QUEUE_H2C:
+	case RTW_TX_QUEUE_HI0:
+		txaddr = FIELD_PREP(REG_SDIO_CMD_ADDR_MSK,
+				    REG_SDIO_CMD_ADDR_TXFF_HIGH);
+		break;
+	case RTW_TX_QUEUE_VI:
+	case RTW_TX_QUEUE_VO:
+		txaddr = FIELD_PREP(REG_SDIO_CMD_ADDR_MSK,
+				    REG_SDIO_CMD_ADDR_TXFF_NORMAL);
+		break;
+	case RTW_TX_QUEUE_BE:
+	case RTW_TX_QUEUE_BK:
+		txaddr = FIELD_PREP(REG_SDIO_CMD_ADDR_MSK,
+				    REG_SDIO_CMD_ADDR_TXFF_LOW);
+		break;
+	case RTW_TX_QUEUE_MGMT:
+		txaddr = FIELD_PREP(REG_SDIO_CMD_ADDR_MSK,
+				    REG_SDIO_CMD_ADDR_TXFF_EXTRA);
+		break;
+	default:
+		rtw_warn(rtwdev, "Unsupported queue for TX addr: 0x%02x\n",
+			 queue);
+		return 0;
+	}
+
+	txaddr += DIV_ROUND_UP(size, 4);
+
+	return txaddr;
+};
+
+static int rtw_sdio_read_port(struct rtw_dev *rtwdev, u8 *buf, size_t count)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	bool bus_claim = rtw_sdio_bus_claim_needed(rtwsdio);
+	u32 rxaddr = rtwsdio->rx_addr++;
+	int ret;
+
+	if (bus_claim)
+		sdio_claim_host(rtwsdio->sdio_func);
+
+	ret = sdio_memcpy_fromio(rtwsdio->sdio_func, buf,
+				 RTW_SDIO_ADDR_RX_RX0FF_GEN(rxaddr), count);
+	if (ret)
+		rtw_warn(rtwdev,
+			 "Failed to read %zu byte(s) from SDIO port 0x%08x",
+			 count, rxaddr);
+
+	if (bus_claim)
+		sdio_release_host(rtwsdio->sdio_func);
+
+	return ret;
+}
+
+static int rtw_sdio_check_free_txpg(struct rtw_dev *rtwdev, u8 queue,
+				    size_t count)
+{
+	unsigned int pages_free, pages_needed;
+
+	if (rtw_chip_wcpu_11n(rtwdev)) {
+		u32 free_txpg;
+
+		free_txpg = rtw_sdio_read32(rtwdev, REG_SDIO_FREE_TXPG);
+
+		switch (queue) {
+		case RTW_TX_QUEUE_BCN:
+		case RTW_TX_QUEUE_H2C:
+		case RTW_TX_QUEUE_HI0:
+		case RTW_TX_QUEUE_MGMT:
+			/* high */
+			pages_free = free_txpg & 0xff;
+			break;
+		case RTW_TX_QUEUE_VI:
+		case RTW_TX_QUEUE_VO:
+			/* normal */
+			pages_free = (free_txpg >> 8) & 0xff;
+			break;
+		case RTW_TX_QUEUE_BE:
+		case RTW_TX_QUEUE_BK:
+			/* low */
+			pages_free = (free_txpg >> 16) & 0xff;
+			break;
+		default:
+			rtw_warn(rtwdev, "Unknown mapping for queue %u\n", queue);
+			return -EINVAL;
+		}
+
+		/* add the pages from the public queue */
+		pages_free += (free_txpg >> 24) & 0xff;
+	} else {
+		u32 free_txpg[3];
+
+		free_txpg[0] = rtw_sdio_read32(rtwdev, REG_SDIO_FREE_TXPG);
+		free_txpg[1] = rtw_sdio_read32(rtwdev, REG_SDIO_FREE_TXPG + 4);
+		free_txpg[2] = rtw_sdio_read32(rtwdev, REG_SDIO_FREE_TXPG + 8);
+
+		switch (queue) {
+		case RTW_TX_QUEUE_BCN:
+		case RTW_TX_QUEUE_H2C:
+		case RTW_TX_QUEUE_HI0:
+			/* high */
+			pages_free = free_txpg[0] & 0xfff;
+			break;
+		case RTW_TX_QUEUE_VI:
+		case RTW_TX_QUEUE_VO:
+			/* normal */
+			pages_free = (free_txpg[0] >> 16) & 0xfff;
+			break;
+		case RTW_TX_QUEUE_BE:
+		case RTW_TX_QUEUE_BK:
+			/* low */
+			pages_free = free_txpg[1] & 0xfff;
+			break;
+		case RTW_TX_QUEUE_MGMT:
+			/* extra */
+			pages_free = free_txpg[2] & 0xfff;
+			break;
+		default:
+			rtw_warn(rtwdev, "Unknown mapping for queue %u\n", queue);
+			return -EINVAL;
+		}
+
+		/* add the pages from the public queue */
+		pages_free += (free_txpg[1] >> 16) & 0xfff;
+	}
+
+	pages_needed = DIV_ROUND_UP(count, rtwdev->chip->page_size);
+
+	if (pages_needed > pages_free) {
+		rtw_dbg(rtwdev, RTW_DBG_SDIO,
+			"Not enough free pages (%u needed, %u free) in queue %u for %zu bytes\n",
+			pages_needed, pages_free, queue, count);
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+static int rtw_sdio_write_port(struct rtw_dev *rtwdev, struct sk_buff *skb,
+			       enum rtw_tx_queue_type queue)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	bool bus_claim;
+	size_t txsize;
+	u32 txaddr;
+	int ret;
+
+	txaddr = rtw_sdio_get_tx_addr(rtwdev, skb->len, queue);
+	if (!txaddr)
+		return -EINVAL;
+
+	txsize = sdio_align_size(rtwsdio->sdio_func, skb->len);
+
+	ret = rtw_sdio_check_free_txpg(rtwdev, queue, txsize);
+	if (ret)
+		return ret;
+
+	if (!IS_ALIGNED((unsigned long)skb->data, RTW_SDIO_DATA_PTR_ALIGN))
+		rtw_warn(rtwdev, "Got unaligned SKB in %s() for queue %u\n",
+			 __func__, queue);
+
+	bus_claim = rtw_sdio_bus_claim_needed(rtwsdio);
+
+	if (bus_claim)
+		sdio_claim_host(rtwsdio->sdio_func);
+
+	ret = sdio_memcpy_toio(rtwsdio->sdio_func, txaddr, skb->data, txsize);
+
+	if (bus_claim)
+		sdio_release_host(rtwsdio->sdio_func);
+
+	if (ret)
+		rtw_warn(rtwdev,
+			 "Failed to write %zu byte(s) to SDIO port 0x%08x",
+			 txsize, txaddr);
+
+	return ret;
+}
+
+static void rtw_sdio_init(struct rtw_dev *rtwdev)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+
+	rtwsdio->irq_mask = REG_SDIO_HIMR_RX_REQUEST | REG_SDIO_HIMR_CPWM1;
+}
+
+static void rtw_sdio_enable_rx_aggregation(struct rtw_dev *rtwdev)
+{
+	u8 size, timeout;
+
+	if (rtwdev->chip->id == RTW_CHIP_TYPE_8822C) {
+		/* Disable RX aggregation because it hurts the RX performance
+		 * on RTL8822CS chips. It's not clear why that is because the
+		 * vendor driver explicitly mentions that for RTL8822CS RX
+		 * aggregation should always be enabled.
+		 */
+		rtw_write32_clr(rtwdev, REG_RXDMA_AGG_PG_TH, BIT_EN_PRE_CALC);
+		rtw_write8_clr(rtwdev, REG_TXDMA_PQ_MAP, BIT_RXDMA_AGG_EN);
+		rtw_write8_clr(rtwdev, REG_RXDMA_MODE, BIT_DMA_MODE);
+	} else {
+		if (rtw_chip_wcpu_11n(rtwdev)) {
+			size = 0x6;
+			timeout = 0x6;
+		} else {
+			size = 0xff;
+			timeout = 0x1;
+		}
+
+		/* Make the firmware honor the size limit configured below */
+		rtw_write32_set(rtwdev, REG_RXDMA_AGG_PG_TH, BIT_EN_PRE_CALC);
+
+		rtw_write8_set(rtwdev, REG_TXDMA_PQ_MAP, BIT_RXDMA_AGG_EN);
+
+		rtw_write16(rtwdev, REG_RXDMA_AGG_PG_TH,
+			    FIELD_PREP(BIT_RXDMA_AGG_PG_TH, size) |
+			    FIELD_PREP(BIT_DMA_AGG_TO_V1, timeout));
+
+		rtw_write8_set(rtwdev, REG_RXDMA_MODE, BIT_DMA_MODE);
+	}
+}
+
+static void rtw_sdio_enable_interrupt(struct rtw_dev *rtwdev)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+
+	rtw_write32(rtwdev, REG_SDIO_HIMR, rtwsdio->irq_mask);
+}
+
+static void rtw_sdio_disable_interrupt(struct rtw_dev *rtwdev)
+{
+	rtw_write32(rtwdev, REG_SDIO_HIMR, 0x0);
+}
+
+static u8 rtw_sdio_get_tx_qsel(struct rtw_dev *rtwdev, struct sk_buff *skb,
+			       u8 queue)
+{
+	switch (queue) {
+	case RTW_TX_QUEUE_BCN:
+		return TX_DESC_QSEL_BEACON;
+	case RTW_TX_QUEUE_H2C:
+		return TX_DESC_QSEL_H2C;
+	case RTW_TX_QUEUE_MGMT:
+		if (rtw_chip_wcpu_11n(rtwdev))
+			return TX_DESC_QSEL_HIGH;
+		else
+			return TX_DESC_QSEL_MGMT;
+	case RTW_TX_QUEUE_HI0:
+		return TX_DESC_QSEL_HIGH;
+	default:
+		return skb->priority;
+	}
+}
+
+static int rtw_sdio_setup(struct rtw_dev *rtwdev)
+{
+	/* nothing to do */
+	return 0;
+}
+
+static int rtw_sdio_start(struct rtw_dev *rtwdev)
+{
+	rtw_sdio_enable_rx_aggregation(rtwdev);
+	rtw_sdio_enable_interrupt(rtwdev);
+
+	return 0;
+}
+
+static void rtw_sdio_stop(struct rtw_dev *rtwdev)
+{
+	rtw_sdio_disable_interrupt(rtwdev);
+}
+
+static void rtw_sdio_deep_ps_enter(struct rtw_dev *rtwdev)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	bool tx_empty = true;
+	u8 queue;
+
+	if (!rtw_fw_feature_check(&rtwdev->fw, FW_FEATURE_TX_WAKE)) {
+		/* Deep PS state is not allowed to TX-DMA */
+		for (queue = 0; queue < RTK_MAX_TX_QUEUE_NUM; queue++) {
+			/* BCN queue is rsvd page, does not have DMA interrupt
+			 * H2C queue is managed by firmware
+			 */
+			if (queue == RTW_TX_QUEUE_BCN ||
+			    queue == RTW_TX_QUEUE_H2C)
+				continue;
+
+			/* check if there is any skb DMAing */
+			if (skb_queue_len(&rtwsdio->tx_queue[queue])) {
+				tx_empty = false;
+				break;
+			}
+		}
+	}
+
+	if (!tx_empty) {
+		rtw_dbg(rtwdev, RTW_DBG_PS,
+			"TX path not empty, cannot enter deep power save state\n");
+		return;
+	}
+
+	set_bit(RTW_FLAG_LEISURE_PS_DEEP, rtwdev->flags);
+	rtw_power_mode_change(rtwdev, true);
+}
+
+static void rtw_sdio_deep_ps_leave(struct rtw_dev *rtwdev)
+{
+	if (test_and_clear_bit(RTW_FLAG_LEISURE_PS_DEEP, rtwdev->flags))
+		rtw_power_mode_change(rtwdev, false);
+}
+
+static void rtw_sdio_deep_ps(struct rtw_dev *rtwdev, bool enter)
+{
+	if (enter && !test_bit(RTW_FLAG_LEISURE_PS_DEEP, rtwdev->flags))
+		rtw_sdio_deep_ps_enter(rtwdev);
+
+	if (!enter && test_bit(RTW_FLAG_LEISURE_PS_DEEP, rtwdev->flags))
+		rtw_sdio_deep_ps_leave(rtwdev);
+}
+
+static void rtw_sdio_tx_kick_off(struct rtw_dev *rtwdev)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+
+	queue_work(rtwsdio->txwq, &rtwsdio->tx_handler_data->work);
+}
+
+static void rtw_sdio_link_ps(struct rtw_dev *rtwdev, bool enter)
+{
+	/* nothing to do */
+}
+
+static void rtw_sdio_interface_cfg(struct rtw_dev *rtwdev)
+{
+	u32 val;
+
+	rtw_read32(rtwdev, REG_SDIO_FREE_TXPG);
+
+	val = rtw_read32(rtwdev, REG_SDIO_TX_CTRL);
+	val &= 0xfff8;
+	rtw_write32(rtwdev, REG_SDIO_TX_CTRL, val);
+}
+
+static struct rtw_sdio_tx_data *rtw_sdio_get_tx_data(struct sk_buff *skb)
+{
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+
+	BUILD_BUG_ON(sizeof(struct rtw_sdio_tx_data) >
+		     sizeof(info->status.status_driver_data));
+
+	return (struct rtw_sdio_tx_data *)info->status.status_driver_data;
+}
+
+static void rtw_sdio_tx_skb_prepare(struct rtw_dev *rtwdev,
+				    struct rtw_tx_pkt_info *pkt_info,
+				    struct sk_buff *skb,
+				    enum rtw_tx_queue_type queue)
+{
+	const struct rtw_chip_info *chip = rtwdev->chip;
+	unsigned long data_addr, aligned_addr;
+	size_t offset;
+	u8 *pkt_desc;
+
+	pkt_desc = skb_push(skb, chip->tx_pkt_desc_sz);
+
+	data_addr = (unsigned long)pkt_desc;
+	aligned_addr = ALIGN(data_addr, RTW_SDIO_DATA_PTR_ALIGN);
+
+	if (data_addr != aligned_addr) {
+		/* Ensure that the start of the pkt_desc is always aligned at
+		 * RTW_SDIO_DATA_PTR_ALIGN.
+		 */
+		offset = RTW_SDIO_DATA_PTR_ALIGN - (aligned_addr - data_addr);
+
+		pkt_desc = skb_push(skb, offset);
+
+		/* By inserting padding to align the start of the pkt_desc we
+		 * need to inform the firmware that the actual data starts at
+		 * a different offset than normal.
+		 */
+		pkt_info->offset += offset;
+	}
+
+	memset(pkt_desc, 0, chip->tx_pkt_desc_sz);
+
+	pkt_info->qsel = rtw_sdio_get_tx_qsel(rtwdev, skb, queue);
+
+	rtw_tx_fill_tx_desc(pkt_info, skb);
+	rtw_tx_fill_txdesc_checksum(rtwdev, pkt_info, pkt_desc);
+}
+
+static int rtw_sdio_write_data(struct rtw_dev *rtwdev,
+			       struct rtw_tx_pkt_info *pkt_info,
+			       struct sk_buff *skb,
+			       enum rtw_tx_queue_type queue)
+{
+	int ret;
+
+	rtw_sdio_tx_skb_prepare(rtwdev, pkt_info, skb, queue);
+
+	ret = rtw_sdio_write_port(rtwdev, skb, queue);
+	dev_kfree_skb_any(skb);
+
+	return ret;
+}
+
+static int rtw_sdio_write_data_rsvd_page(struct rtw_dev *rtwdev, u8 *buf,
+					 u32 size)
+{
+	struct rtw_tx_pkt_info pkt_info = {};
+	struct sk_buff *skb;
+
+	skb = rtw_tx_write_data_rsvd_page_get(rtwdev, &pkt_info, buf, size);
+	if (!skb)
+		return -ENOMEM;
+
+	return rtw_sdio_write_data(rtwdev, &pkt_info, skb, RTW_TX_QUEUE_BCN);
+}
+
+static int rtw_sdio_write_data_h2c(struct rtw_dev *rtwdev, u8 *buf, u32 size)
+{
+	struct rtw_tx_pkt_info pkt_info = {};
+	struct sk_buff *skb;
+
+	skb = rtw_tx_write_data_h2c_get(rtwdev, &pkt_info, buf, size);
+	if (!skb)
+		return -ENOMEM;
+
+	return rtw_sdio_write_data(rtwdev, &pkt_info, skb, RTW_TX_QUEUE_H2C);
+}
+
+static int rtw_sdio_tx_write(struct rtw_dev *rtwdev,
+			     struct rtw_tx_pkt_info *pkt_info,
+			     struct sk_buff *skb)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	enum rtw_tx_queue_type queue = rtw_tx_queue_mapping(skb);
+	struct rtw_sdio_tx_data *tx_data;
+
+	rtw_sdio_tx_skb_prepare(rtwdev, pkt_info, skb, queue);
+
+	tx_data = rtw_sdio_get_tx_data(skb);
+	tx_data->sn = pkt_info->sn;
+
+	skb_queue_tail(&rtwsdio->tx_queue[queue], skb);
+
+	return 0;
+}
+
+static void rtw_sdio_tx_err_isr(struct rtw_dev *rtwdev)
+{
+	u32 val = rtw_read32(rtwdev, REG_TXDMA_STATUS);
+
+	rtw_write32(rtwdev, REG_TXDMA_STATUS, val);
+}
+
+static void rtw_sdio_rx_skb(struct rtw_dev *rtwdev, struct sk_buff *skb,
+			    u32 pkt_offset, struct rtw_rx_pkt_stat *pkt_stat,
+			    struct ieee80211_rx_status *rx_status)
+{
+	memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status));
+
+	if (pkt_stat->is_c2h) {
+		skb_put(skb, pkt_stat->pkt_len + pkt_offset);
+		rtw_fw_c2h_cmd_rx_irqsafe(rtwdev, pkt_offset, skb);
+		return;
+	}
+
+	skb_put(skb, pkt_stat->pkt_len);
+	skb_reserve(skb, pkt_offset);
+
+	rtw_rx_stats(rtwdev, pkt_stat->vif, skb);
+
+	ieee80211_rx_irqsafe(rtwdev->hw, skb);
+}
+
+static void rtw_sdio_rxfifo_recv(struct rtw_dev *rtwdev, u32 rx_len)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	const struct rtw_chip_info *chip = rtwdev->chip;
+	u32 pkt_desc_sz = chip->rx_pkt_desc_sz;
+	struct ieee80211_rx_status rx_status;
+	struct rtw_rx_pkt_stat pkt_stat;
+	struct sk_buff *skb, *split_skb;
+	u32 pkt_offset, curr_pkt_len;
+	size_t bufsz;
+	u8 *rx_desc;
+	int ret;
+
+	bufsz = sdio_align_size(rtwsdio->sdio_func, rx_len);
+
+	skb = dev_alloc_skb(bufsz);
+	if (!skb)
+		return;
+
+	ret = rtw_sdio_read_port(rtwdev, skb->data, bufsz);
+	if (ret) {
+		dev_kfree_skb_any(skb);
+		return;
+	}
+
+	while (true) {
+		rx_desc = skb->data;
+		chip->ops->query_rx_desc(rtwdev, rx_desc, &pkt_stat,
+					 &rx_status);
+		pkt_offset = pkt_desc_sz + pkt_stat.drv_info_sz +
+			     pkt_stat.shift;
+
+		curr_pkt_len = ALIGN(pkt_offset + pkt_stat.pkt_len,
+				     RTW_SDIO_DATA_PTR_ALIGN);
+
+		if ((curr_pkt_len + pkt_desc_sz) >= rx_len) {
+			/* Use the original skb (with it's adjusted offset)
+			 * when processing the last (or even the only) entry to
+			 * have it's memory freed automatically.
+			 */
+			rtw_sdio_rx_skb(rtwdev, skb, pkt_offset, &pkt_stat,
+					&rx_status);
+			break;
+		}
+
+		split_skb = dev_alloc_skb(curr_pkt_len);
+		if (!split_skb) {
+			rtw_sdio_rx_skb(rtwdev, skb, pkt_offset, &pkt_stat,
+					&rx_status);
+			break;
+		}
+
+		skb_copy_header(split_skb, skb);
+		memcpy(split_skb->data, skb->data, curr_pkt_len);
+
+		rtw_sdio_rx_skb(rtwdev, split_skb, pkt_offset, &pkt_stat,
+				&rx_status);
+
+		/* Move to the start of the next RX descriptor */
+		skb_reserve(skb, curr_pkt_len);
+		rx_len -= curr_pkt_len;
+	}
+}
+
+static void rtw_sdio_rx_isr(struct rtw_dev *rtwdev)
+{
+	u32 rx_len;
+
+	while (true) {
+		if (rtw_chip_wcpu_11n(rtwdev))
+			rx_len = rtw_read16(rtwdev, REG_SDIO_RX0_REQ_LEN);
+		else
+			rx_len = rtw_read32(rtwdev, REG_SDIO_RX0_REQ_LEN);
+
+		if (!rx_len)
+			break;
+
+		rtw_sdio_rxfifo_recv(rtwdev, rx_len);
+	}
+}
+
+static void rtw_sdio_handle_interrupt(struct sdio_func *sdio_func)
+{
+	struct ieee80211_hw *hw = sdio_get_drvdata(sdio_func);
+	struct rtw_dev *rtwdev = hw->priv;
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	u32 hisr;
+
+	rtwsdio->irq_thread = current;
+
+	hisr = rtw_read32(rtwdev, REG_SDIO_HISR);
+
+	if (hisr & REG_SDIO_HISR_TXERR)
+		rtw_sdio_tx_err_isr(rtwdev);
+	if (hisr & REG_SDIO_HISR_RX_REQUEST) {
+		hisr &= ~REG_SDIO_HISR_RX_REQUEST;
+		rtw_sdio_rx_isr(rtwdev);
+	}
+
+	rtw_write32(rtwdev, REG_SDIO_HISR, hisr);
+
+	rtwsdio->irq_thread = NULL;
+}
+
+static int __maybe_unused rtw_sdio_suspend(struct device *dev)
+{
+	return 0;
+}
+
+static int __maybe_unused rtw_sdio_resume(struct device *dev)
+{
+	return 0;
+}
+
+SIMPLE_DEV_PM_OPS(rtw_sdio_pm_ops, rtw_sdio_suspend, rtw_sdio_resume);
+EXPORT_SYMBOL(rtw_sdio_pm_ops);
+
+static int rtw_sdio_claim(struct rtw_dev *rtwdev, struct sdio_func *sdio_func)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	int ret;
+
+	sdio_claim_host(sdio_func);
+
+	ret = sdio_enable_func(sdio_func);
+	if (ret) {
+		rtw_err(rtwdev, "Failed to enable SDIO func");
+		goto err_release_host;
+	}
+
+	ret = sdio_set_block_size(sdio_func, RTW_SDIO_BLOCK_SIZE);
+	if (ret) {
+		rtw_err(rtwdev, "Failed to set SDIO block size to 512");
+		goto err_disable_func;
+	}
+
+	rtwsdio->sdio_func = sdio_func;
+
+	rtwsdio->sdio3_bus_mode = mmc_card_uhs(sdio_func->card);
+
+	sdio_set_drvdata(sdio_func, rtwdev->hw);
+	SET_IEEE80211_DEV(rtwdev->hw, &sdio_func->dev);
+
+	sdio_release_host(sdio_func);
+
+	return 0;
+
+err_disable_func:
+	sdio_disable_func(sdio_func);
+err_release_host:
+	sdio_release_host(sdio_func);
+	return ret;
+}
+
+static void rtw_sdio_declaim(struct rtw_dev *rtwdev,
+			     struct sdio_func *sdio_func)
+{
+	sdio_claim_host(sdio_func);
+	sdio_disable_func(sdio_func);
+	sdio_release_host(sdio_func);
+}
+
+static struct rtw_hci_ops rtw_sdio_ops = {
+	.tx_write = rtw_sdio_tx_write,
+	.tx_kick_off = rtw_sdio_tx_kick_off,
+	.setup = rtw_sdio_setup,
+	.start = rtw_sdio_start,
+	.stop = rtw_sdio_stop,
+	.deep_ps = rtw_sdio_deep_ps,
+	.link_ps = rtw_sdio_link_ps,
+	.interface_cfg = rtw_sdio_interface_cfg,
+
+	.read8 = rtw_sdio_read8,
+	.read16 = rtw_sdio_read16,
+	.read32 = rtw_sdio_read32,
+	.write8 = rtw_sdio_write8,
+	.write16 = rtw_sdio_write16,
+	.write32 = rtw_sdio_write32,
+	.write_data_rsvd_page = rtw_sdio_write_data_rsvd_page,
+	.write_data_h2c = rtw_sdio_write_data_h2c,
+};
+
+static int rtw_sdio_request_irq(struct rtw_dev *rtwdev,
+				struct sdio_func *sdio_func)
+{
+	int ret;
+
+	sdio_claim_host(sdio_func);
+	ret = sdio_claim_irq(sdio_func, &rtw_sdio_handle_interrupt);
+	sdio_release_host(sdio_func);
+
+	if (ret) {
+		rtw_err(rtwdev, "failed to claim SDIO IRQ");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void rtw_sdio_indicate_tx_status(struct rtw_dev *rtwdev,
+					struct sk_buff *skb)
+{
+	struct rtw_sdio_tx_data *tx_data = rtw_sdio_get_tx_data(skb);
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+	struct ieee80211_hw *hw = rtwdev->hw;
+
+	/* enqueue to wait for tx report */
+	if (info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS) {
+		rtw_tx_report_enqueue(rtwdev, skb, tx_data->sn);
+		return;
+	}
+
+	/* always ACK for others, then they won't be marked as drop */
+	ieee80211_tx_info_clear_status(info);
+	if (info->flags & IEEE80211_TX_CTL_NO_ACK)
+		info->flags |= IEEE80211_TX_STAT_NOACK_TRANSMITTED;
+	else
+		info->flags |= IEEE80211_TX_STAT_ACK;
+
+	ieee80211_tx_status_irqsafe(hw, skb);
+}
+
+static void rtw_sdio_process_tx_queue(struct rtw_dev *rtwdev,
+				      enum rtw_tx_queue_type queue)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	struct sk_buff *skb;
+	int ret;
+
+	skb = skb_dequeue(&rtwsdio->tx_queue[queue]);
+	if (!skb)
+		return;
+
+	ret = rtw_sdio_write_port(rtwdev, skb, queue);
+	if (ret) {
+		skb_queue_head(&rtwsdio->tx_queue[queue], skb);
+		return;
+	}
+
+	if (queue <= RTW_TX_QUEUE_VO)
+		rtw_sdio_indicate_tx_status(rtwdev, skb);
+	else
+		dev_kfree_skb_any(skb);
+}
+
+static void rtw_sdio_tx_handler(struct work_struct *work)
+{
+	struct rtw_sdio_work_data *work_data =
+		container_of(work, struct rtw_sdio_work_data, work);
+	struct rtw_dev *rtwdev = work_data->rtwdev;
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	int limit, queue;
+
+	if (!rtw_fw_feature_check(&rtwdev->fw, FW_FEATURE_TX_WAKE))
+		rtw_sdio_deep_ps_leave(rtwdev);
+
+	for (queue = RTK_MAX_TX_QUEUE_NUM - 1; queue >= 0; queue--) {
+		for (limit = 0; limit < 1000; limit++) {
+			rtw_sdio_process_tx_queue(rtwdev, queue);
+
+			if (skb_queue_empty(&rtwsdio->tx_queue[queue]))
+				break;
+		}
+	}
+}
+
+static void rtw_sdio_free_irq(struct rtw_dev *rtwdev,
+			      struct sdio_func *sdio_func)
+{
+	sdio_release_irq(sdio_func);
+}
+
+static int rtw_sdio_init_tx(struct rtw_dev *rtwdev)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	int i;
+
+	rtwsdio->txwq = create_singlethread_workqueue("rtw88_sdio: tx wq");
+	if (!rtwsdio->txwq) {
+		rtw_err(rtwdev, "failed to create TX work queue\n");
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < RTK_MAX_TX_QUEUE_NUM; i++)
+		skb_queue_head_init(&rtwsdio->tx_queue[i]);
+	rtwsdio->tx_handler_data = kmalloc(sizeof(*rtwsdio->tx_handler_data),
+					   GFP_KERNEL);
+	if (!rtwsdio->tx_handler_data)
+		goto err_destroy_wq;
+
+	rtwsdio->tx_handler_data->rtwdev = rtwdev;
+	INIT_WORK(&rtwsdio->tx_handler_data->work, rtw_sdio_tx_handler);
+
+	return 0;
+
+err_destroy_wq:
+	destroy_workqueue(rtwsdio->txwq);
+	return -ENOMEM;
+}
+
+static void rtw_sdio_deinit_tx(struct rtw_dev *rtwdev)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+	int i;
+
+	for (i = 0; i < RTK_MAX_TX_QUEUE_NUM; i++)
+		skb_queue_purge(&rtwsdio->tx_queue[i]);
+
+	flush_workqueue(rtwsdio->txwq);
+	destroy_workqueue(rtwsdio->txwq);
+	kfree(rtwsdio->tx_handler_data);
+}
+
+int rtw_sdio_probe(struct sdio_func *sdio_func,
+		   const struct sdio_device_id *id)
+{
+	struct ieee80211_hw *hw;
+	struct rtw_dev *rtwdev;
+	int drv_data_size;
+	int ret;
+
+	drv_data_size = sizeof(struct rtw_dev) + sizeof(struct rtw_sdio);
+	hw = ieee80211_alloc_hw(drv_data_size, &rtw_ops);
+	if (!hw) {
+		dev_err(&sdio_func->dev, "failed to allocate hw");
+		return -ENOMEM;
+	}
+
+	rtwdev = hw->priv;
+	rtwdev->hw = hw;
+	rtwdev->dev = &sdio_func->dev;
+	rtwdev->chip = (struct rtw_chip_info *)id->driver_data;
+	rtwdev->hci.ops = &rtw_sdio_ops;
+	rtwdev->hci.type = RTW_HCI_TYPE_SDIO;
+
+	ret = rtw_core_init(rtwdev);
+	if (ret)
+		goto err_release_hw;
+
+	rtw_dbg(rtwdev, RTW_DBG_SDIO,
+		"rtw88 SDIO probe: vendor=0x%04x device=%04x class=%02x",
+		id->vendor, id->device, id->class);
+
+	ret = rtw_sdio_claim(rtwdev, sdio_func);
+	if (ret) {
+		rtw_err(rtwdev, "failed to claim SDIO device");
+		goto err_deinit_core;
+	}
+
+	rtw_sdio_init(rtwdev);
+
+	ret = rtw_sdio_init_tx(rtwdev);
+	if (ret) {
+		rtw_err(rtwdev, "failed to init SDIO TX queue\n");
+		goto err_sdio_declaim;
+	}
+
+	ret = rtw_chip_info_setup(rtwdev);
+	if (ret) {
+		rtw_err(rtwdev, "failed to setup chip information");
+		goto err_destroy_txwq;
+	}
+
+	ret = rtw_register_hw(rtwdev, hw);
+	if (ret) {
+		rtw_err(rtwdev, "failed to register hw");
+		goto err_destroy_txwq;
+	}
+
+	ret = rtw_sdio_request_irq(rtwdev, sdio_func);
+	if (ret)
+		goto err_unregister_hw;
+
+	return 0;
+
+err_unregister_hw:
+	rtw_unregister_hw(rtwdev, hw);
+err_destroy_txwq:
+	rtw_sdio_deinit_tx(rtwdev);
+err_sdio_declaim:
+	rtw_sdio_declaim(rtwdev, sdio_func);
+err_deinit_core:
+	rtw_core_deinit(rtwdev);
+err_release_hw:
+	ieee80211_free_hw(hw);
+
+	return ret;
+}
+EXPORT_SYMBOL(rtw_sdio_probe);
+
+void rtw_sdio_remove(struct sdio_func *sdio_func)
+{
+	struct ieee80211_hw *hw = sdio_get_drvdata(sdio_func);
+	struct rtw_dev *rtwdev;
+
+	if (!hw)
+		return;
+
+	rtwdev = hw->priv;
+
+	rtw_unregister_hw(rtwdev, hw);
+	rtw_sdio_disable_interrupt(rtwdev);
+	rtw_sdio_declaim(rtwdev, sdio_func);
+	rtw_sdio_free_irq(rtwdev, sdio_func);
+	rtw_sdio_deinit_tx(rtwdev);
+	rtw_core_deinit(rtwdev);
+	ieee80211_free_hw(hw);
+}
+EXPORT_SYMBOL(rtw_sdio_remove);
+
+void rtw_sdio_shutdown(struct device *dev)
+{
+	struct sdio_func *sdio_func = dev_to_sdio_func(dev);
+	struct ieee80211_hw *hw = sdio_get_drvdata(sdio_func);
+	const struct rtw_chip_info *chip;
+	struct rtw_dev *rtwdev;
+
+	if (!hw)
+		return;
+
+	rtwdev = hw->priv;
+	chip = rtwdev->chip;
+
+	if (chip->ops->shutdown)
+		chip->ops->shutdown(rtwdev);
+}
+EXPORT_SYMBOL(rtw_sdio_shutdown);
+
+MODULE_AUTHOR("Martin Blumenstingl");
+MODULE_AUTHOR("Jernej Skrabec");
+MODULE_DESCRIPTION("Realtek 802.11ac wireless SDIO driver");
+MODULE_LICENSE("Dual BSD/GPL");
diff --git a/drivers/net/wireless/realtek/rtw88/sdio.h b/drivers/net/wireless/realtek/rtw88/sdio.h
new file mode 100644
index 000000000000..10bbc21e42a2
--- /dev/null
+++ b/drivers/net/wireless/realtek/rtw88/sdio.h
@@ -0,0 +1,175 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
+/* Copyright (C) 2021 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ * Copyright (C) 2021 Jernej Skrabec <jernej.skrabec@gmail.com>
+ */
+
+#ifndef __REG_SDIO_H_
+#define __REG_SDIO_H_
+
+#include "main.h"
+
+/* I/O bus domain address mapping */
+#define SDIO_LOCAL_OFFSET			0x10250000
+#define WLAN_IOREG_OFFSET			0x10260000
+#define FIRMWARE_FIFO_OFFSET			0x10270000
+#define TX_HIQ_OFFSET				0x10310000
+#define TX_MIQ_OFFSET				0x10320000
+#define TX_LOQ_OFFSET				0x10330000
+#define TX_EPQ_OFFSET				0x10350000
+#define RX_RX0FF_OFFSET				0x10340000
+
+#define RTW_SDIO_BUS_MSK			0xffff0000
+#define SDIO_LOCAL_REG_MSK			0x00000fff
+#define WLAN_IOREG_REG_MSK			0x0000ffff
+
+/* SDIO Tx Control */
+#define REG_SDIO_TX_CTRL			(SDIO_LOCAL_OFFSET + 0x0000)
+
+/*SDIO status timeout*/
+#define REG_SDIO_TIMEOUT			(SDIO_LOCAL_OFFSET + 0x0002)
+
+/* SDIO Host Interrupt Mask */
+#define REG_SDIO_HIMR				(SDIO_LOCAL_OFFSET + 0x0014)
+#define REG_SDIO_HIMR_RX_REQUEST		BIT(0)
+#define REG_SDIO_HIMR_AVAL			BIT(1)
+#define REG_SDIO_HIMR_TXERR			BIT(2)
+#define REG_SDIO_HIMR_RXERR			BIT(3)
+#define REG_SDIO_HIMR_TXFOVW			BIT(4)
+#define REG_SDIO_HIMR_RXFOVW			BIT(5)
+#define REG_SDIO_HIMR_TXBCNOK			BIT(6)
+#define REG_SDIO_HIMR_TXBCNERR			BIT(7)
+#define REG_SDIO_HIMR_BCNERLY_INT		BIT(16)
+#define REG_SDIO_HIMR_C2HCMD			BIT(17)
+#define REG_SDIO_HIMR_CPWM1			BIT(18)
+#define REG_SDIO_HIMR_CPWM2			BIT(19)
+#define REG_SDIO_HIMR_HSISR_IND			BIT(20)
+#define REG_SDIO_HIMR_GTINT3_IND		BIT(21)
+#define REG_SDIO_HIMR_GTINT4_IND		BIT(22)
+#define REG_SDIO_HIMR_PSTIMEOUT			BIT(23)
+#define REG_SDIO_HIMR_OCPINT			BIT(24)
+#define REG_SDIO_HIMR_ATIMEND			BIT(25)
+#define REG_SDIO_HIMR_ATIMEND_E			BIT(26)
+#define REG_SDIO_HIMR_CTWEND			BIT(27)
+/* the following two are RTL8188 SDIO Specific */
+#define REG_SDIO_HIMR_MCU_ERR			BIT(28)
+#define REG_SDIO_HIMR_TSF_BIT32_TOGGLE		BIT(29)
+
+/* SDIO Host Interrupt Service Routine */
+#define REG_SDIO_HISR				(SDIO_LOCAL_OFFSET + 0x0018)
+#define REG_SDIO_HISR_RX_REQUEST		BIT(0)
+#define REG_SDIO_HISR_AVAL			BIT(1)
+#define REG_SDIO_HISR_TXERR			BIT(2)
+#define REG_SDIO_HISR_RXERR			BIT(3)
+#define REG_SDIO_HISR_TXFOVW			BIT(4)
+#define REG_SDIO_HISR_RXFOVW			BIT(5)
+#define REG_SDIO_HISR_TXBCNOK			BIT(6)
+#define REG_SDIO_HISR_TXBCNERR			BIT(7)
+#define REG_SDIO_HISR_BCNERLY_INT		BIT(16)
+#define REG_SDIO_HISR_C2HCMD			BIT(17)
+#define REG_SDIO_HISR_CPWM1			BIT(18)
+#define REG_SDIO_HISR_CPWM2			BIT(19)
+#define REG_SDIO_HISR_HSISR_IND			BIT(20)
+#define REG_SDIO_HISR_GTINT3_IND		BIT(21)
+#define REG_SDIO_HISR_GTINT4_IND		BIT(22)
+#define REG_SDIO_HISR_PSTIMEOUT			BIT(23)
+#define REG_SDIO_HISR_OCPINT			BIT(24)
+#define REG_SDIO_HISR_ATIMEND			BIT(25)
+#define REG_SDIO_HISR_ATIMEND_E			BIT(26)
+#define REG_SDIO_HISR_CTWEND			BIT(27)
+/* the following two are RTL8188 SDIO Specific */
+#define REG_SDIO_HISR_MCU_ERR			BIT(28)
+#define REG_SDIO_HISR_TSF_BIT32_TOGGLE		BIT(29)
+
+/* HCI Current Power Mode */
+#define REG_SDIO_HCPWM				(SDIO_LOCAL_OFFSET + 0x0019)
+/* RXDMA Request Length */
+#define REG_SDIO_RX0_REQ_LEN			(SDIO_LOCAL_OFFSET + 0x001C)
+/* OQT Free Page */
+#define REG_SDIO_OQT_FREE_PG			(SDIO_LOCAL_OFFSET + 0x001E)
+/* Free Tx Buffer Page */
+#define REG_SDIO_FREE_TXPG			(SDIO_LOCAL_OFFSET + 0x0020)
+/* HCI Current Power Mode 1 */
+#define REG_SDIO_HCPWM1				(SDIO_LOCAL_OFFSET + 0x0024)
+/* HCI Current Power Mode 2 */
+#define REG_SDIO_HCPWM2				(SDIO_LOCAL_OFFSET + 0x0026)
+/* Free Tx Page Sequence */
+#define REG_SDIO_FREE_TXPG_SEQ			(SDIO_LOCAL_OFFSET + 0x0028)
+/* HTSF Informaion */
+#define REG_SDIO_HTSFR_INFO			(SDIO_LOCAL_OFFSET + 0x0030)
+#define REG_SDIO_HCPWM1_V2			(SDIO_LOCAL_OFFSET + 0x0038)
+/* H2C */
+#define REG_SDIO_H2C				(SDIO_LOCAL_OFFSET + 0x0060)
+/* HCI Request Power Mode 1 */
+#define REG_SDIO_HRPWM1				(SDIO_LOCAL_OFFSET + 0x0080)
+/* HCI Request Power Mode 2 */
+#define REG_SDIO_HRPWM2				(SDIO_LOCAL_OFFSET + 0x0082)
+/* HCI Power Save Clock */
+#define REG_SDIO_HPS_CLKR			(SDIO_LOCAL_OFFSET + 0x0084)
+/* SDIO HCI Suspend Control */
+#define REG_SDIO_HSUS_CTRL			(SDIO_LOCAL_OFFSET + 0x0086)
+#define BIT_HCI_SUS_REQ				BIT(0)
+#define BIT_HCI_RESUME_RDY			BIT(1)
+/* SDIO Host Extension Interrupt Mask Always */
+#define REG_SDIO_HIMR_ON			(SDIO_LOCAL_OFFSET + 0x0090)
+/* SDIO Host Extension Interrupt Status Always */
+#define REG_SDIO_HISR_ON			(SDIO_LOCAL_OFFSET + 0x0091)
+
+#define REG_SDIO_INDIRECT_REG_CFG		(SDIO_LOCAL_OFFSET + 0x0040)
+#define REG_SDIO_INDIRECT_REG_DATA		(SDIO_LOCAL_OFFSET + 0x0044)
+
+/* Sdio Address for SDIO Local Reg, TRX FIFO, MAC Reg */
+#define REG_SDIO_CMD_ADDR_MSK			GENMASK(16, 13)
+#define REG_SDIO_CMD_ADDR_SDIO_REG		0
+#define REG_SDIO_CMD_ADDR_MAC_REG		8
+#define REG_SDIO_CMD_ADDR_TXFF_HIGH		4
+#define REG_SDIO_CMD_ADDR_TXFF_LOW		6
+#define REG_SDIO_CMD_ADDR_TXFF_NORMAL		5
+#define REG_SDIO_CMD_ADDR_TXFF_EXTRA		7
+#define REG_SDIO_CMD_ADDR_RXFF			7
+
+#define RTW_SDIO_BLOCK_SIZE			512
+#define RTW_SDIO_ADDR_RX_RX0FF_GEN(_id)		(0x0e000 | ((_id) & 0x3))
+
+#define RTW_SDIO_DATA_PTR_ALIGN			8
+
+struct sdio_func;
+struct sdio_device_id;
+
+struct rtw_sdio_tx_data {
+	u8 sn;
+};
+
+struct rtw_sdio_work_data {
+	struct work_struct work;
+	struct rtw_dev *rtwdev;
+};
+
+struct rtw_sdio {
+	struct sdio_func *sdio_func;
+
+	u32 irq_mask;
+	u8 rx_addr;
+	bool sdio3_bus_mode;
+
+	void *irq_thread;
+
+	struct workqueue_struct *txwq;
+	struct rtw_sdio_work_data *tx_handler_data;
+	struct sk_buff_head tx_queue[RTK_MAX_TX_QUEUE_NUM];
+};
+
+extern const struct dev_pm_ops rtw_sdio_pm_ops;
+
+int rtw_sdio_probe(struct sdio_func *sdio_func,
+		   const struct sdio_device_id *id);
+void rtw_sdio_remove(struct sdio_func *sdio_func);
+void rtw_sdio_shutdown(struct device *dev);
+
+static inline bool rtw_sdio_is_sdio30_supported(struct rtw_dev *rtwdev)
+{
+	struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
+
+	return rtwsdio->sdio3_bus_mode;
+}
+
+#endif
