2 files changed, 718 insertions, 0 deletions

diff --git a/target/linux/rtl838x/files-5.4/drivers/mtd/spi-nor/rtl838x-nor.c b/target/linux/rtl838x/files-5.4/drivers/mtd/spi-nor/rtl838x-nor.c
new file mode 100644
index 0000000000..0d8f9dbd3e
--- /dev/null
+++ b/target/linux/rtl838x/files-5.4/drivers/mtd/spi-nor/rtl838x-nor.c
@@ -0,0 +1,607 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/spi-nor.h>
+
+#include "rtl838x-spi.h"
+#include <asm/mach-rtl838x/mach-rtl838x.h>
+
+extern struct rtl838x_soc_info soc_info;
+
+struct rtl838x_nor {
+	struct spi_nor nor;
+	struct device *dev;
+	volatile void __iomem *base;
+	bool fourByteMode;
+	u32 chipSize;
+	uint32_t flags;
+	uint32_t io_status;
+};
+
+static uint32_t spi_prep(struct rtl838x_nor *rtl838x_nor)
+{
+	/* Needed because of MMU constraints */
+	SPI_WAIT_READY;
+	spi_w32w(SPI_CS_INIT, SFCSR);	//deactivate CS0, CS1
+	spi_w32w(0, SFCSR);		//activate CS0,CS1
+	spi_w32w(SPI_CS_INIT, SFCSR);	//deactivate CS0, CS1
+
+	return (CS0 & rtl838x_nor->flags) ? (SPI_eCS0 & SPI_LEN_INIT)
+			: ((SPI_eCS1 & SPI_LEN_INIT) | SFCSR_CHIP_SEL);
+}
+
+static uint32_t rtl838x_nor_get_SR(struct rtl838x_nor *rtl838x_nor)
+{
+	uint32_t sfcsr, sfdr;
+
+	sfcsr = spi_prep(rtl838x_nor);
+	sfdr  = (SPINOR_OP_RDSR)<<24;
+
+	pr_debug("%s: rdid,sfcsr_val = %.8x,SFDR = %.8x\n", __func__, sfcsr, sfdr);
+	pr_debug("rdid,sfcsr = %.8x\n", sfcsr | SPI_LEN4);
+	spi_w32w(sfcsr, SFCSR);
+	spi_w32w(sfdr, SFDR);
+	spi_w32_mask(0, SPI_LEN4, SFCSR);
+	SPI_WAIT_READY;
+
+	return spi_r32(SFDR);
+}
+
+static void spi_write_disable(struct rtl838x_nor *rtl838x_nor)
+{
+	uint32_t sfcsr, sfdr;
+
+	sfcsr = spi_prep(rtl838x_nor);
+	sfdr = (SPINOR_OP_WRDI) << 24;
+	spi_w32w(sfcsr, SFCSR);
+	spi_w32w(sfdr, SFDR);
+	pr_debug("%s: sfcsr_val = %.8x,SFDR = %.8x", __func__, sfcsr, sfdr);
+
+	spi_prep(rtl838x_nor);
+}
+
+static void spi_write_enable(struct rtl838x_nor *rtl838x_nor)
+{
+	uint32_t sfcsr, sfdr;
+
+	sfcsr = spi_prep(rtl838x_nor);
+	sfdr = (SPINOR_OP_WREN) << 24;
+	spi_w32w(sfcsr, SFCSR);
+	spi_w32w(sfdr, SFDR);
+	pr_debug("%s: sfcsr_val = %.8x,SFDR = %.8x", __func__, sfcsr, sfdr);
+
+	spi_prep(rtl838x_nor);
+}
+
+static void spi_4b_set(struct rtl838x_nor *rtl838x_nor, bool enable)
+{
+	uint32_t sfcsr, sfdr;
+
+	sfcsr = spi_prep(rtl838x_nor);
+	if (enable)
+		sfdr = (SPINOR_OP_EN4B) << 24;
+	else
+		sfdr = (SPINOR_OP_EX4B) << 24;
+
+	spi_w32w(sfcsr, SFCSR);
+	spi_w32w(sfdr, SFDR);
+	pr_debug("%s: sfcsr_val = %.8x,SFDR = %.8x", __func__, sfcsr, sfdr);
+
+	spi_prep(rtl838x_nor);
+}
+
+static int rtl838x_get_addr_mode(struct rtl838x_nor *rtl838x_nor)
+{
+	int res = 3;
+	u32 reg;
+
+	sw_w32(0x3, RTL838X_INT_RW_CTRL);
+	if (!sw_r32(RTL838X_EXT_VERSION)) {
+		if (sw_r32(RTL838X_STRAP_DBG) & (1 << 29))
+			res = 4;
+	} else {
+		reg = sw_r32(RTL838X_PLL_CML_CTRL);
+		if ((reg & (1 << 30)) && (reg & (1 << 31)))
+			res = 4;
+		if ((!(reg & (1 << 30)))
+		     && sw_r32(RTL838X_STRAP_DBG) & (1 << 29))
+			res = 4;
+	}
+	sw_w32(0x0, RTL838X_INT_RW_CTRL);
+	return res;
+}
+
+static int rtl8390_get_addr_mode(struct rtl838x_nor *rtl838x_nor)
+{
+	if (spi_r32(RTL8390_SOC_SPI_MMIO_CONF) & (1 << 9))
+		return 4;
+	return 3;
+}
+
+ssize_t rtl838x_do_read(struct rtl838x_nor *rtl838x_nor, loff_t from,
+			       size_t length, u_char *buffer, uint8_t command)
+{
+	uint32_t sfcsr, sfdr;
+	uint32_t len = length;
+
+	sfcsr = spi_prep(rtl838x_nor);
+	sfdr = command << 24;
+
+	/* Perform SPINOR_OP_READ: 1 byte command & 3 byte addr*/
+	sfcsr |= SPI_LEN4;
+	sfdr |= from;
+
+	spi_w32w(sfcsr, SFCSR);
+	spi_w32w(sfdr, SFDR);
+
+	/* Read Data, 4 bytes at a time */
+	while (length >= 4) {
+		SPI_WAIT_READY;
+		*((uint32_t *) buffer) = spi_r32(SFDR);
+/*		printk("%.8x  ", *((uint32_t*) buffer)); */
+		buffer += 4;
+		length -= 4;
+	}
+
+	/* The rest needs to be read 1 byte a time */
+	sfcsr &= SPI_LEN_INIT|SPI_LEN1;
+	SPI_WAIT_READY;
+	spi_w32w(sfcsr, SFCSR);
+	while (length > 0) {
+		SPI_WAIT_READY;
+		*(buffer) = spi_r32(SFDR) >> 24;
+/*		printk("%.2x  ", *(buffer)); */
+		buffer++;
+		length--;
+	}
+	return len;
+}
+
+/*
+ * Do fast read in 3 or 4 Byte addressing mode
+ */
+static ssize_t rtl838x_do_4bf_read(struct rtl838x_nor *rtl838x_nor, loff_t from,
+			       size_t length, u_char *buffer, uint8_t command)
+{
+	int sfcsr_addr_len = rtl838x_nor->fourByteMode ? 0x3 : 0x2;
+	int sfdr_addr_shift = rtl838x_nor->fourByteMode ? 0 : 8;
+	uint32_t sfcsr;
+	uint32_t len = length;
+
+	pr_debug("Fast read from %llx, len %x, shift %d\n",
+		 from, sfcsr_addr_len, sfdr_addr_shift);
+	sfcsr = spi_prep(rtl838x_nor);
+
+	/* Send read command */
+	spi_w32w(sfcsr | SPI_LEN1, SFCSR);
+	spi_w32w(command << 24, SFDR);
+
+	/* Send address */
+	spi_w32w(sfcsr | (sfcsr_addr_len << 28), SFCSR);
+	spi_w32w(from << sfdr_addr_shift, SFDR);
+
+	/* Dummy cycles */
+	spi_w32w(sfcsr | SPI_LEN1, SFCSR);
+	spi_w32w(0, SFDR);
+
+	/* Start reading */
+	spi_w32w(sfcsr | SPI_LEN4, SFCSR);
+
+	/* Read Data, 4 bytes at a time */
+	while (length >= 4) {
+		SPI_WAIT_READY;
+		*((uint32_t *) buffer) = spi_r32(SFDR);
+/*		printk("%.8x  ", *((uint32_t*) buffer)); */
+		buffer += 4;
+		length -= 4;
+	}
+
+	/* The rest needs to be read 1 byte a time */
+	sfcsr &= SPI_LEN_INIT|SPI_LEN1;
+	SPI_WAIT_READY;
+	spi_w32w(sfcsr, SFCSR);
+	while (length > 0) {
+		SPI_WAIT_READY;
+		*(buffer) = spi_r32(SFDR) >> 24;
+/*		printk("%.2x  ", *(buffer)); */
+		buffer++;
+		length--;
+	}
+	return len;
+
+}
+
+/*
+ * Do write (Page Programming) in 3 or 4 Byte addressing mode
+ */
+static ssize_t rtl838x_do_4b_write(struct rtl838x_nor *rtl838x_nor, loff_t to,
+				    size_t length, const u_char *buffer,
+				    uint8_t command)
+{
+	int sfcsr_addr_len = rtl838x_nor->fourByteMode ? 0x3 : 0x2;
+	int sfdr_addr_shift = rtl838x_nor->fourByteMode ? 0 : 8;
+	uint32_t sfcsr;
+	uint32_t len = length;
+
+	pr_debug("Write to %llx, len %x, shift %d\n",
+		 to, sfcsr_addr_len, sfdr_addr_shift);
+	sfcsr = spi_prep(rtl838x_nor);
+
+	/* Send write command, command IO-width is 1 (bit 25/26) */
+	spi_w32w(sfcsr | SPI_LEN1 | (0 << 25), SFCSR);
+	spi_w32w(command << 24, SFDR);
+
+	/* Send address */
+	spi_w32w(sfcsr | (sfcsr_addr_len << 28) | (0 << 25), SFCSR);
+	spi_w32w(to << sfdr_addr_shift, SFDR);
+
+	/* Write Data, 1 byte at a time, if we are not 4-byte aligned */
+	if (((long)buffer) % 4) {
+		spi_w32w(sfcsr | SPI_LEN1, SFCSR);
+		while (length > 0 && (((long)buffer) % 4)) {
+			SPI_WAIT_READY;
+			spi_w32(*(buffer) << 24, SFDR);
+			buffer += 1;
+			length -= 1;
+		}
+	}
+
+	/* Now we can write 4 bytes at a time */
+	SPI_WAIT_READY;
+	spi_w32w(sfcsr | SPI_LEN4, SFCSR);
+	while (length >= 4) {
+		SPI_WAIT_READY;
+		spi_w32(*((uint32_t *)buffer), SFDR);
+		buffer += 4;
+		length -= 4;
+	}
+
+	/* Final bytes might need to be written 1 byte at a time, again */
+	SPI_WAIT_READY;
+	spi_w32w(sfcsr | SPI_LEN1, SFCSR);
+	while (length > 0) {
+		SPI_WAIT_READY;
+		spi_w32(*(buffer) << 24, SFDR);
+		buffer++;
+		length--;
+	}
+	return len;
+}
+
+static ssize_t rtl838x_nor_write(struct spi_nor *nor, loff_t to, size_t len,
+				 const u_char *buffer)
+{
+	int ret = 0;
+	uint32_t offset = 0;
+	struct rtl838x_nor *rtl838x_nor = nor->priv;
+	size_t l = len;
+	uint8_t cmd = SPINOR_OP_PP;
+
+	/* Do write in 4-byte mode on large Macronix chips */
+	if (rtl838x_nor->fourByteMode) {
+		cmd = SPINOR_OP_PP_4B;
+		spi_4b_set(rtl838x_nor, true);
+	}
+
+	pr_debug("In %s %8x to: %llx\n", __func__,
+		 (unsigned int) rtl838x_nor, to);
+
+	while (l >= SPI_MAX_TRANSFER_SIZE) {
+		while
+			(rtl838x_nor_get_SR(rtl838x_nor) & SPI_WIP);
+		do {
+			spi_write_enable(rtl838x_nor);
+		} while (!(rtl838x_nor_get_SR(rtl838x_nor) & SPI_WEL));
+		ret = rtl838x_do_4b_write(rtl838x_nor, to + offset,
+				SPI_MAX_TRANSFER_SIZE, buffer+offset, cmd);
+		l -= SPI_MAX_TRANSFER_SIZE;
+		offset += SPI_MAX_TRANSFER_SIZE;
+	}
+
+	if (l > 0) {
+		while
+			(rtl838x_nor_get_SR(rtl838x_nor) & SPI_WIP);
+		do {
+			spi_write_enable(rtl838x_nor);
+		} while (!(rtl838x_nor_get_SR(rtl838x_nor) & SPI_WEL));
+		ret = rtl838x_do_4b_write(rtl838x_nor, to+offset,
+					  len, buffer+offset, cmd);
+	}
+
+	return len;
+}
+
+static ssize_t rtl838x_nor_read(struct spi_nor *nor, loff_t from,
+				size_t length, u_char *buffer)
+{
+	uint32_t offset = 0;
+	uint8_t cmd = SPINOR_OP_READ_FAST;
+	size_t l = length;
+	struct rtl838x_nor *rtl838x_nor = nor->priv;
+
+	/* Do fast read in 3, or 4-byte mode on large Macronix chips */
+	if (rtl838x_nor->fourByteMode) {
+		cmd = SPINOR_OP_READ_FAST_4B;
+		spi_4b_set(rtl838x_nor, true);
+	}
+
+	/* TODO: do timeout and return error */
+	pr_debug("Waiting for pending writes\n");
+	while
+		(rtl838x_nor_get_SR(rtl838x_nor) & SPI_WIP);
+	do {
+		spi_write_enable(rtl838x_nor);
+	} while (!(rtl838x_nor_get_SR(rtl838x_nor) & SPI_WEL));
+
+	pr_debug("cmd is %d\n", cmd);
+	pr_debug("%s: addr %.8llx to addr %.8x, cmd %.8x, size %d\n", __func__,
+		 from, (u32)buffer, (u32)cmd, length);
+
+	while (l >= SPI_MAX_TRANSFER_SIZE) {
+		rtl838x_do_4bf_read(rtl838x_nor, from + offset,
+				    SPI_MAX_TRANSFER_SIZE, buffer+offset, cmd);
+		l -= SPI_MAX_TRANSFER_SIZE;
+		offset += SPI_MAX_TRANSFER_SIZE;
+	}
+
+	if (l > 0)
+		rtl838x_do_4bf_read(rtl838x_nor, from + offset, l, buffer+offset, cmd);
+
+	return length;
+}
+
+static int rtl838x_erase(struct spi_nor *nor, loff_t offs)
+{
+	struct rtl838x_nor *rtl838x_nor = nor->priv;
+	int sfcsr_addr_len = rtl838x_nor->fourByteMode ? 0x3 : 0x2;
+	int sfdr_addr_shift = rtl838x_nor->fourByteMode ? 0 : 8;
+	uint32_t sfcsr;
+	uint8_t cmd = SPINOR_OP_SE;
+
+	pr_debug("Erasing sector at %llx\n", offs);
+
+	/* Do erase in 4-byte mode on large Macronix chips */
+	if (rtl838x_nor->fourByteMode) {
+		cmd = SPINOR_OP_SE_4B;
+		spi_4b_set(rtl838x_nor, true);
+	}
+	/* TODO: do timeout and return error */
+	while
+		(rtl838x_nor_get_SR(rtl838x_nor) & SPI_WIP);
+	do {
+		spi_write_enable(rtl838x_nor);
+	} while (!(rtl838x_nor_get_SR(rtl838x_nor) & SPI_WEL));
+
+	sfcsr = spi_prep(rtl838x_nor);
+
+	/* Send erase command, command IO-width is 1 (bit 25/26) */
+	spi_w32w(sfcsr | SPI_LEN1 | (0 << 25), SFCSR);
+	spi_w32w(cmd << 24, SFDR);
+
+	/* Send address */
+	spi_w32w(sfcsr | (sfcsr_addr_len << 28) | (0 << 25), SFCSR);
+	spi_w32w(offs << sfdr_addr_shift, SFDR);
+
+	return 0;
+}
+
+static int rtl838x_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
+{
+	int length = len;
+	u8 *buffer = buf;
+	uint32_t sfcsr, sfdr;
+	struct rtl838x_nor *rtl838x_nor = nor->priv;
+
+	pr_debug("In %s: opcode %x, len %x\n", __func__, opcode, len);
+
+	sfcsr = spi_prep(rtl838x_nor);
+	sfdr = opcode << 24;
+
+	sfcsr |= SPI_LEN1;
+
+	spi_w32w(sfcsr, SFCSR);
+	spi_w32w(sfdr, SFDR);
+
+	while (length > 0) {
+		SPI_WAIT_READY;
+		*(buffer) = spi_r32(SFDR) >> 24;
+		buffer++;
+		length--;
+	}
+
+	return len;
+}
+
+static int rtl838x_nor_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
+{
+	uint32_t sfcsr, sfdr;
+	struct rtl838x_nor *rtl838x_nor = nor->priv;
+
+	pr_debug("In %s, opcode %x, len %x\n", __func__, opcode, len);
+	sfcsr = spi_prep(rtl838x_nor);
+	sfdr = opcode << 24;
+
+	if (len == 1) { /* SPINOR_OP_WRSR */
+		sfdr |= buf[0];
+		sfcsr |= SPI_LEN2;
+	}
+	spi_w32w(sfcsr, SFCSR);
+	spi_w32w(sfdr, SFDR);
+	return 0;
+}
+
+static int spi_enter_sio(struct spi_nor *nor)
+{
+	uint32_t sfcsr, sfcr2, sfdr;
+	uint32_t ret = 0, reg = 0, size_bits;
+	struct rtl838x_nor *rtl838x_nor = nor->priv;
+
+	pr_debug("In %s\n", __func__);
+	rtl838x_nor->io_status = 0;
+	sfdr = SPI_C_RSTQIO << 24;
+	sfcsr = spi_prep(rtl838x_nor);
+
+	reg = spi_r32(SFCR2);
+	pr_debug("SFCR2: %x, size %x, rdopt: %x\n", reg, SFCR2_GETSIZE(reg),
+						  (reg & SFCR2_RDOPT));
+	size_bits = rtl838x_nor->fourByteMode ? SFCR2_SIZE(0x6) : SFCR2_SIZE(0x7);
+
+	sfcr2 = SFCR2_HOLD_TILL_SFDR2 | size_bits
+		| (reg & SFCR2_RDOPT) | SFCR2_CMDIO(0)
+		| SFCR2_ADDRIO(0) | SFCR2_DUMMYCYCLE(4)
+		| SFCR2_DATAIO(0) | SFCR2_SFCMD(SPINOR_OP_READ_FAST);
+	pr_debug("SFCR2: %x, size %x\n", reg, SFCR2_GETSIZE(reg));
+
+	SPI_WAIT_READY;
+	spi_w32w(sfcr2, SFCR2);
+	spi_w32w(sfcsr, SFCSR);
+	spi_w32w(sfdr, SFDR);
+
+	spi_w32_mask(SFCR2_HOLD_TILL_SFDR2, 0, SFCR2);
+	rtl838x_nor->io_status &= ~IOSTATUS_CIO_MASK;
+	rtl838x_nor->io_status |= CIO1;
+
+	spi_prep(rtl838x_nor);
+
+	return ret;
+}
+
+int rtl838x_spi_nor_scan(struct spi_nor *nor, const char *name)
+{
+	static const struct spi_nor_hwcaps hwcaps = {
+		.mask = SNOR_HWCAPS_READ | SNOR_HWCAPS_PP
+			| SNOR_HWCAPS_READ_FAST
+	};
+
+	struct rtl838x_nor *rtl838x_nor = nor->priv;
+
+	pr_debug("In %s\n", __func__);
+
+	spi_w32_mask(0, SFCR_EnableWBO, SFCR);
+	spi_w32_mask(0, SFCR_EnableRBO, SFCR);
+
+	rtl838x_nor->flags = CS0 | R_MODE;
+
+	spi_nor_scan(nor, NULL, &hwcaps);
+	pr_debug("------------- Got size: %llx\n", nor->mtd.size);
+
+	return 0;
+}
+
+int rtl838x_nor_init(struct rtl838x_nor *rtl838x_nor,
+			struct device_node *flash_node)
+{
+	int ret;
+	struct spi_nor *nor;
+
+	pr_info("%s called\n", __func__);
+	nor = &rtl838x_nor->nor;
+	nor->dev = rtl838x_nor->dev;
+	nor->priv = rtl838x_nor;
+	spi_nor_set_flash_node(nor, flash_node);
+
+	nor->read_reg = rtl838x_nor_read_reg;
+	nor->write_reg = rtl838x_nor_write_reg;
+	nor->read = rtl838x_nor_read;
+	nor->write = rtl838x_nor_write;
+	nor->erase = rtl838x_erase;
+	nor->mtd.name = "rtl838x_nor";
+	nor->erase_opcode = rtl838x_nor->fourByteMode ? SPINOR_OP_SE_4B
+					: SPINOR_OP_SE;
+	/* initialized with NULL */
+	ret = rtl838x_spi_nor_scan(nor, NULL);
+	if (ret)
+		return ret;
+
+	spi_enter_sio(nor);
+	spi_write_disable(rtl838x_nor);
+
+	ret = mtd_device_parse_register(&nor->mtd, NULL, NULL, NULL, 0);
+	return ret;
+}
+
+static int rtl838x_nor_drv_probe(struct platform_device *pdev)
+{
+	struct device_node *flash_np;
+	struct resource *res;
+	int ret;
+	struct rtl838x_nor *rtl838x_nor;
+	int addrMode;
+
+	pr_info("Initializing rtl838x_nor_driver\n");
+	if (!pdev->dev.of_node) {
+		dev_err(&pdev->dev, "No DT found\n");
+		return -EINVAL;
+	}
+
+	rtl838x_nor = devm_kzalloc(&pdev->dev, sizeof(*rtl838x_nor), GFP_KERNEL);
+	if (!rtl838x_nor)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, rtl838x_nor);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	rtl838x_nor->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR((void *)rtl838x_nor->base))
+		return PTR_ERR((void *)rtl838x_nor->base);
+
+	pr_info("SPI resource base is %08x\n", (u32)rtl838x_nor->base);
+	rtl838x_nor->dev = &pdev->dev;
+
+	/* only support one attached flash */
+	flash_np = of_get_next_available_child(pdev->dev.of_node, NULL);
+	if (!flash_np) {
+		dev_err(&pdev->dev, "no SPI flash device to configure\n");
+		ret = -ENODEV;
+		goto nor_free;
+	}
+
+	/* Get the 3/4 byte address mode as configure by bootloader */
+	if (soc_info.family == RTL8390_FAMILY_ID)
+		addrMode = rtl8390_get_addr_mode(rtl838x_nor);
+	else
+		addrMode = rtl838x_get_addr_mode(rtl838x_nor);
+	pr_info("Address mode is %d bytes\n", addrMode);
+	if (addrMode == 4)
+		rtl838x_nor->fourByteMode = true;
+
+	ret = rtl838x_nor_init(rtl838x_nor, flash_np);
+
+nor_free:
+	return ret;
+}
+
+static int rtl838x_nor_drv_remove(struct platform_device *pdev)
+{
+/*	struct rtl8xx_nor *rtl838x_nor = platform_get_drvdata(pdev); */
+	return 0;
+}
+
+static const struct of_device_id rtl838x_nor_of_ids[] = {
+	{ .compatible = "realtek,rtl838x-nor"},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rtl838x_nor_of_ids);
+
+static struct platform_driver rtl838x_nor_driver = {
+	.probe = rtl838x_nor_drv_probe,
+	.remove = rtl838x_nor_drv_remove,
+	.driver = {
+		.name = "rtl838x-nor",
+		.pm = NULL,
+		.of_match_table = rtl838x_nor_of_ids,
+	},
+};
+
+module_platform_driver(rtl838x_nor_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("RTL838x SPI NOR Flash Driver");
diff --git a/target/linux/rtl838x/files-5.4/drivers/mtd/spi-nor/rtl838x-spi.h b/target/linux/rtl838x/files-5.4/drivers/mtd/spi-nor/rtl838x-spi.h
new file mode 100644
index 0000000000..1209d47b02
--- /dev/null
+++ b/target/linux/rtl838x/files-5.4/drivers/mtd/spi-nor/rtl838x-spi.h
@@ -0,0 +1,111 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2009 Realtek Semiconductor Corp.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _RTL838X_SPI_H
+#define _RTL838X_SPI_H
+
+
+/*
+ * Register access macros
+ */
+
+#define spi_r32(reg)		__raw_readl(rtl838x_nor->base + reg)
+#define spi_w32(val, reg)	__raw_writel(val, rtl838x_nor->base + reg)
+#define spi_w32_mask(clear, set, reg)	\
+	spi_w32((spi_r32(reg) & ~(clear)) | (set), reg)
+
+#define SPI_WAIT_READY		do { \
+				} while (!(spi_r32(SFCSR) & SFCSR_SPI_RDY))
+
+#define spi_w32w(val, reg)	do { \
+					__raw_writel(val, rtl838x_nor->base + reg); \
+					SPI_WAIT_READY; \
+				} while (0)
+
+#define SFCR   (0x00)			/*SPI Flash Configuration Register*/
+	#define SFCR_CLK_DIV(val)	((val)<<29)
+	#define SFCR_EnableRBO		(1<<28)
+	#define SFCR_EnableWBO		(1<<27)
+	#define SFCR_SPI_TCS(val)	((val)<<23) /*4 bit, 1111 */
+
+#define SFCR2  (0x04)	/*For memory mapped I/O */
+	#define SFCR2_SFCMD(val)	((val)<<24) /*8 bit, 1111_1111 */
+	#define SFCR2_SIZE(val)		((val)<<21) /*3 bit, 111 */
+	#define SFCR2_RDOPT		(1<<20)
+	#define SFCR2_CMDIO(val)	((val)<<18) /*2 bit, 11 */
+	#define SFCR2_ADDRIO(val)	((val)<<16) /*2 bit, 11 */
+	#define SFCR2_DUMMYCYCLE(val)	((val)<<13) /*3 bit, 111 */
+	#define SFCR2_DATAIO(val)	((val)<<11) /*2 bit, 11 */
+	#define SFCR2_HOLD_TILL_SFDR2	(1<<10)
+	#define SFCR2_GETSIZE(x)	(((x)&0x00E00000)>>21)
+
+#define SFCSR  (0x08)	/*SPI Flash Control&Status Register*/
+	#define SFCSR_SPI_CSB0		(1<<31)
+	#define SFCSR_SPI_CSB1		(1<<30)
+	#define SFCSR_LEN(val)		((val)<<28)  /*2 bits*/
+	#define SFCSR_SPI_RDY		(1<<27)
+	#define SFCSR_IO_WIDTH(val)	((val)<<25)  /*2 bits*/
+	#define SFCSR_CHIP_SEL		(1<<24)
+	#define SFCSR_CMD_BYTE(val)	((val)<<16)  /*8 bit, 1111_1111 */
+
+#define SFDR   (0x0C)	/*SPI Flash Data Register*/
+#define SFDR2  (0x10)	/*SPI Flash Data Register - for post SPI bootup setting*/
+	#define SPI_CS_INIT		(SFCSR_SPI_CSB0 | SFCSR_SPI_CSB1 | SPI_LEN1)
+	#define SPI_CS0			SFCSR_SPI_CSB0
+	#define SPI_CS1			SFCSR_SPI_CSB1
+	#define SPI_eCS0		((SFCSR_SPI_CSB1)) /*and SFCSR to active CS0*/
+	#define SPI_eCS1		((SFCSR_SPI_CSB0)) /*and SFCSR to active CS1*/
+
+	#define SPI_WIP (1)		/* Write In Progress */
+	#define SPI_WEL (1<<1)		/* Write Enable Latch*/
+	#define SPI_SST_QIO_WIP (1<<7)	/* SST QIO Flash Write In Progress */
+	#define SPI_LEN_INIT 0xCFFFFFFF /* and SFCSR to init   */
+	#define SPI_LEN4    0x30000000	/* or SFCSR to set */
+	#define SPI_LEN3    0x20000000	/* or SFCSR to set */
+	#define SPI_LEN2    0x10000000	/* or SFCSR to set */
+	#define SPI_LEN1    0x00000000	/* or SFCSR to set */
+	#define SPI_SETLEN(val) do {		\
+			SPI_REG(SFCSR) &= 0xCFFFFFFF;   \
+			SPI_REG(SFCSR) |= (val-1)<<28;	\
+		} while (0)
+/*
+ * SPI interface control
+ */
+#define RTL8390_SOC_SPI_MMIO_CONF (0x04)
+
+#define IOSTATUS_CIO_MASK (0x00000038)
+
+/* Chip select: bits 4-7*/
+#define CS0 (1<<4)
+#define R_MODE 0x04
+
+/* io_status */
+#define IO1 (1<<0)
+#define IO2 (1<<1)
+#define CIO1 (1<<3)
+#define CIO2 (1<<4)
+#define CMD_IO1 (1<<6)
+#define W_ADDR_IO1 ((1)<<12)
+#define R_ADDR_IO2 ((2)<<9)
+#define R_DATA_IO2 ((2)<<15)
+#define W_DATA_IO1 ((1)<<18)
+
+/* Commands */
+#define SPI_C_RSTQIO 0xFF
+
+#define SPI_MAX_TRANSFER_SIZE 256
+
+#endif		/* _RTL838X_SPI_H */