drivers/mtd/renesas_rpc_hf.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Renesas RCar Gen3 RPC HyperFlash driver
  *
  * Copyright (C) 2016 Renesas Electronics Corporation
  * Copyright (C) 2016 Cogent Embedded, Inc.
  * Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com>
  */

 #include <common.h>
 #include <malloc.h>
 #include <asm/io.h>
 #include <clk.h>
 #include <dm.h>
 #include <dm/device_compat.h>
 #include <dm/of_access.h>
 #include <errno.h>
 #include <fdt_support.h>
 #include <flash.h>
 #include <mtd.h>
 #include <wait_bit.h>
 #include <linux/bitops.h>
 #include <mtd/cfi_flash.h>
 #include <asm/global_data.h>

 #define RPC_CMNCR		0x0000	/* R/W */
 #define RPC_CMNCR_MD		BIT(31)
 #define RPC_CMNCR_MOIIO0(val)	(((val) & 0x3) << 16)
 #define RPC_CMNCR_MOIIO1(val)	(((val) & 0x3) << 18)
 #define RPC_CMNCR_MOIIO2(val)	(((val) & 0x3) << 20)
 #define RPC_CMNCR_MOIIO3(val)	(((val) & 0x3) << 22)
 #define RPC_CMNCR_MOIIO_HIZ	(RPC_CMNCR_MOIIO0(3) | RPC_CMNCR_MOIIO1(3) | \
 				 RPC_CMNCR_MOIIO2(3) | RPC_CMNCR_MOIIO3(3))
 #define RPC_CMNCR_IO0FV(val)	(((val) & 0x3) << 8)
 #define RPC_CMNCR_IO2FV(val)	(((val) & 0x3) << 12)
 #define RPC_CMNCR_IO3FV(val)	(((val) & 0x3) << 14)
 #define RPC_CMNCR_IOFV_HIZ	(RPC_CMNCR_IO0FV(3) | RPC_CMNCR_IO2FV(3) | \
 				 RPC_CMNCR_IO3FV(3))
 #define RPC_CMNCR_BSZ(val)	(((val) & 0x3) << 0)

 #define RPC_SSLDR		0x0004	/* R/W */
 #define RPC_SSLDR_SPNDL(d)	(((d) & 0x7) << 16)
 #define RPC_SSLDR_SLNDL(d)	(((d) & 0x7) << 8)
 #define RPC_SSLDR_SCKDL(d)	(((d) & 0x7) << 0)

 #define RPC_DRCR		0x000C	/* R/W */
 #define RPC_DRCR_SSLN		BIT(24)
 #define RPC_DRCR_RBURST(v)	(((v) & 0x1F) << 16)
 #define RPC_DRCR_RCF		BIT(9)
 #define RPC_DRCR_RBE		BIT(8)
 #define RPC_DRCR_SSLE		BIT(0)

 #define RPC_DRCMR		0x0010	/* R/W */
 #define RPC_DRCMR_CMD(c)	(((c) & 0xFF) << 16)
 #define RPC_DRCMR_OCMD(c)	(((c) & 0xFF) << 0)

 #define RPC_DREAR		0x0014	/* R/W */
 #define RPC_DREAR_EAV(v)	(((v) & 0xFF) << 16)
 #define RPC_DREAR_EAC(v)	(((v) & 0x7) << 0)

 #define RPC_DROPR		0x0018	/* R/W */
 #define RPC_DROPR_OPD3(o)	(((o) & 0xFF) << 24)
 #define RPC_DROPR_OPD2(o)	(((o) & 0xFF) << 16)
 #define RPC_DROPR_OPD1(o)	(((o) & 0xFF) << 8)
 #define RPC_DROPR_OPD0(o)	(((o) & 0xFF) << 0)

 #define RPC_DRENR		0x001C	/* R/W */
 #define RPC_DRENR_CDB(o)	(u32)((((o) & 0x3) << 30))
 #define RPC_DRENR_OCDB(o)	(((o) & 0x3) << 28)
 #define RPC_DRENR_ADB(o)	(((o) & 0x3) << 24)
 #define RPC_DRENR_OPDB(o)	(((o) & 0x3) << 20)
 #define RPC_DRENR_SPIDB(o)	(((o) & 0x3) << 16)
 #define RPC_DRENR_DME		BIT(15)
 #define RPC_DRENR_CDE		BIT(14)
 #define RPC_DRENR_OCDE		BIT(12)
 #define RPC_DRENR_ADE(v)	(((v) & 0xF) << 8)
 #define RPC_DRENR_OPDE(v)	(((v) & 0xF) << 4)

 #define RPC_SMCR		0x0020	/* R/W */
 #define RPC_SMCR_SSLKP		BIT(8)
 #define RPC_SMCR_SPIRE		BIT(2)
 #define RPC_SMCR_SPIWE		BIT(1)
 #define RPC_SMCR_SPIE		BIT(0)

 #define RPC_SMCMR		0x0024	/* R/W */
 #define RPC_SMCMR_CMD(c)	(((c) & 0xFF) << 16)
 #define RPC_SMCMR_OCMD(c)	(((c) & 0xFF) << 0)

 #define RPC_SMADR		0x0028	/* R/W */
 #define RPC_SMOPR		0x002C	/* R/W */
 #define RPC_SMOPR_OPD0(o)	(((o) & 0xFF) << 0)
 #define RPC_SMOPR_OPD1(o)	(((o) & 0xFF) << 8)
 #define RPC_SMOPR_OPD2(o)	(((o) & 0xFF) << 16)
 #define RPC_SMOPR_OPD3(o)	(((o) & 0xFF) << 24)

 #define RPC_SMENR		0x0030	/* R/W */
 #define RPC_SMENR_CDB(o)	(((o) & 0x3) << 30)
 #define RPC_SMENR_OCDB(o)	(((o) & 0x3) << 28)
 #define RPC_SMENR_ADB(o)	(((o) & 0x3) << 24)
 #define RPC_SMENR_OPDB(o)	(((o) & 0x3) << 20)
 #define RPC_SMENR_SPIDB(o)	(((o) & 0x3) << 16)
 #define RPC_SMENR_DME		BIT(15)
 #define RPC_SMENR_CDE		BIT(14)
 #define RPC_SMENR_OCDE		BIT(12)
 #define RPC_SMENR_ADE(v)	(((v) & 0xF) << 8)
 #define RPC_SMENR_OPDE(v)	(((v) & 0xF) << 4)
 #define RPC_SMENR_SPIDE(v)	(((v) & 0xF) << 0)

 #define RPC_SMRDR0		0x0038	/* R */
 #define RPC_SMRDR1		0x003C	/* R */
 #define RPC_SMWDR0		0x0040	/* R/W */
 #define RPC_SMWDR1		0x0044	/* R/W */
 #define RPC_CMNSR		0x0048	/* R */
 #define RPC_CMNSR_SSLF		BIT(1)
 #define	RPC_CMNSR_TEND		BIT(0)

 #define RPC_DRDMCR		0x0058	/* R/W */
 #define RPC_DRDMCR_DMCYC(v)	(((v) & 0xF) << 0)

 #define RPC_DRDRENR		0x005C	/* R/W */
 #define RPC_DRDRENR_HYPE	(0x5 << 12)
 #define RPC_DRDRENR_ADDRE	BIT(8)
 #define RPC_DRDRENR_OPDRE	BIT(4)
 #define RPC_DRDRENR_DRDRE	BIT(0)

 #define RPC_SMDMCR		0x0060	/* R/W */
 #define RPC_SMDMCR_DMCYC(v)	(((v) & 0xF) << 0)

 #define RPC_SMDRENR		0x0064	/* R/W */
 #define RPC_SMDRENR_HYPE	(0x5 << 12)
 #define RPC_SMDRENR_ADDRE	BIT(8)
 #define RPC_SMDRENR_OPDRE	BIT(4)
 #define RPC_SMDRENR_SPIDRE	BIT(0)

 #define RPC_PHYCNT		0x007C	/* R/W */
 #define RPC_PHYCNT_CAL		BIT(31)
 #define PRC_PHYCNT_OCTA_AA	BIT(22)
 #define PRC_PHYCNT_OCTA_SA	BIT(23)
 #define PRC_PHYCNT_EXDS		BIT(21)
 #define RPC_PHYCNT_OCT		BIT(20)
 #define RPC_PHYCNT_WBUF2	BIT(4)
 #define RPC_PHYCNT_WBUF		BIT(2)
 #define RPC_PHYCNT_MEM(v)	(((v) & 0x3) << 0)

 #define RPC_PHYINT		0x0088	/* R/W */
 #define RPC_PHYINT_RSTEN	BIT(18)
 #define RPC_PHYINT_WPEN		BIT(17)
 #define RPC_PHYINT_INTEN	BIT(16)
 #define RPC_PHYINT_RST		BIT(2)
 #define RPC_PHYINT_WP		BIT(1)
 #define RPC_PHYINT_INT		BIT(0)

 #define RPC_WBUF		0x8000	/* R/W size=4/8/16/32/64Bytes */
 #define RPC_WBUF_SIZE		0x100

 static phys_addr_t rpc_base;

 enum rpc_hf_size {
 	RPC_HF_SIZE_16BIT = RPC_SMENR_SPIDE(0x8),
 	RPC_HF_SIZE_32BIT = RPC_SMENR_SPIDE(0xC),
 	RPC_HF_SIZE_64BIT = RPC_SMENR_SPIDE(0xF),
 };

 static int rpc_hf_wait_tend(void)
 {
 	void __iomem *reg = (void __iomem *)rpc_base + RPC_CMNSR;
 	return wait_for_bit_le32(reg, RPC_CMNSR_TEND, true, 1000, 0);
 }

 static int rpc_hf_mode(bool man)
 {
 	int ret;

 	ret = rpc_hf_wait_tend();
 	if (ret)
 		return ret;

 	clrsetbits_le32(rpc_base + RPC_PHYCNT,
 		 RPC_PHYCNT_WBUF | RPC_PHYCNT_WBUF2 |
 		 RPC_PHYCNT_CAL | RPC_PHYCNT_MEM(3),
 		 RPC_PHYCNT_CAL | RPC_PHYCNT_MEM(3));

 	clrsetbits_le32(rpc_base + RPC_CMNCR,
 		 RPC_CMNCR_MD | RPC_CMNCR_BSZ(3),
 		 RPC_CMNCR_MOIIO_HIZ | RPC_CMNCR_IOFV_HIZ |
 		 (man ? RPC_CMNCR_MD : 0) | RPC_CMNCR_BSZ(1));

 	if (man)
 		return 0;

 	writel(RPC_DRCR_RBURST(0x1F) | RPC_DRCR_RCF | RPC_DRCR_RBE,
 	       rpc_base + RPC_DRCR);

 	writel(RPC_DRCMR_CMD(0xA0), rpc_base + RPC_DRCMR);
 	writel(RPC_DRENR_CDB(2) | RPC_DRENR_OCDB(2) | RPC_DRENR_ADB(2) |
 	       RPC_DRENR_SPIDB(2) | RPC_DRENR_CDE | RPC_DRENR_OCDE |
 	       RPC_DRENR_ADE(4), rpc_base + RPC_DRENR);
 	writel(RPC_DRDMCR_DMCYC(0xE), rpc_base + RPC_DRDMCR);
 	writel(RPC_DRDRENR_HYPE | RPC_DRDRENR_ADDRE | RPC_DRDRENR_DRDRE,
 	       rpc_base + RPC_DRDRENR);

 	/* Dummy read */
 	readl(rpc_base + RPC_DRCR);

 	return 0;
 }

 static int rpc_hf_xfer(void *addr, u64 wdata, u64 *rdata,
 		       enum rpc_hf_size size, bool write)
 {
 	int ret;
 	u32 val;

 	ret = rpc_hf_mode(1);
 	if (ret)
 		return ret;

 	/* Submit HF address, SMCMR CMD[7] ~= CA Bit# 47 (R/nW) */
 	writel(write ? 0 : RPC_SMCMR_CMD(0x80), rpc_base + RPC_SMCMR);
 	writel((uintptr_t)addr >> 1, rpc_base + RPC_SMADR);
 	writel(0x0, rpc_base + RPC_SMOPR);

 	writel(RPC_SMDRENR_HYPE | RPC_SMDRENR_ADDRE | RPC_SMDRENR_SPIDRE,
 	       rpc_base + RPC_SMDRENR);

 	val = RPC_SMENR_CDB(2) | RPC_SMENR_OCDB(2) |
 	      RPC_SMENR_ADB(2) | RPC_SMENR_SPIDB(2) |
 	      RPC_SMENR_CDE | RPC_SMENR_OCDE | RPC_SMENR_ADE(4) | size;

 	if (write) {
 		writel(val, rpc_base + RPC_SMENR);

 		if (size == RPC_HF_SIZE_64BIT)
 			writeq(cpu_to_be64(wdata), rpc_base + RPC_SMWDR0);
 		else
 			writel(cpu_to_be32(wdata), rpc_base + RPC_SMWDR0);

 		writel(RPC_SMCR_SPIWE | RPC_SMCR_SPIE, rpc_base + RPC_SMCR);
 	} else {
 		val |= RPC_SMENR_DME;

 		writel(RPC_SMDMCR_DMCYC(0xE), rpc_base + RPC_SMDMCR);

 		writel(val, rpc_base + RPC_SMENR);

 		writel(RPC_SMCR_SPIRE | RPC_SMCR_SPIE, rpc_base + RPC_SMCR);

 		ret = rpc_hf_wait_tend();
 		if (ret)
 			return ret;

 		if (size == RPC_HF_SIZE_64BIT)
 			*rdata = be64_to_cpu(readq(rpc_base + RPC_SMRDR0));
 		else
 			*rdata = be32_to_cpu(readl(rpc_base + RPC_SMRDR0));
 	}

 	return rpc_hf_mode(0);
 }

 static void rpc_hf_write_cmd(void *addr, u64 wdata, enum rpc_hf_size size)
 {
 	int ret;

 	ret = rpc_hf_xfer(addr, wdata, NULL, size, 1);
 	if (ret)
 		printf("RPC: Write failed, ret=%i\n", ret);
 }

 static u64 rpc_hf_read_reg(void *addr, enum rpc_hf_size size)
 {
 	u64 rdata = 0;
 	int ret;

 	ret = rpc_hf_xfer(addr, 0, &rdata, size, 0);
 	if (ret)
 		printf("RPC: Read failed, ret=%i\n", ret);

 	return rdata;
 }

 void flash_write8(u8 value, void *addr)
 {
 	rpc_hf_write_cmd(addr, value, RPC_HF_SIZE_16BIT);
 }

 void flash_write16(u16 value, void *addr)
 {
 	rpc_hf_write_cmd(addr, value, RPC_HF_SIZE_16BIT);
 }

 void flash_write32(u32 value, void *addr)
 {
 	rpc_hf_write_cmd(addr, value, RPC_HF_SIZE_32BIT);
 }

 void flash_write64(u64 value, void *addr)
 {
 	rpc_hf_write_cmd(addr, value, RPC_HF_SIZE_64BIT);
 }

 u8 flash_read8(void *addr)
 {
 	return rpc_hf_read_reg(addr, RPC_HF_SIZE_16BIT);
 }

 u16 flash_read16(void *addr)
 {
 	return rpc_hf_read_reg(addr, RPC_HF_SIZE_16BIT);
 }

 u32 flash_read32(void *addr)
 {
 	return rpc_hf_read_reg(addr, RPC_HF_SIZE_32BIT);
 }

 u64 flash_read64(void *addr)
 {
 	return rpc_hf_read_reg(addr, RPC_HF_SIZE_64BIT);
 }

 static int rpc_hf_bind(struct udevice *parent)
 {
 	const void *fdt = gd->fdt_blob;
 	ofnode node;
 	int ret, off;

 	/*
 	 * Check if there are any SPI NOR child nodes, if so, do NOT bind
 	 * as this controller will be operated by the QSPI driver instead.
 	 */
 	dev_for_each_subnode(node, parent) {
 		off = ofnode_to_offset(node);

 		ret = fdt_node_check_compatible(fdt, off, "spi-flash");
 		if (!ret)
 			return -ENODEV;

 		ret = fdt_node_check_compatible(fdt, off, "jedec,spi-nor");
 		if (!ret)
 			return -ENODEV;
 	}

 	return 0;
 }

 static int rpc_hf_probe(struct udevice *dev)
 {
 	void *blob = (void *)gd->fdt_blob;
 	const fdt32_t *cell;
 	int node = dev_of_offset(dev);
 	int parent, addrc, sizec, len, ret;
 	struct clk clk;
 	phys_addr_t flash_base;

 	parent = fdt_parent_offset(blob, node);
 	fdt_support_default_count_cells(blob, parent, &addrc, &sizec);
 	cell = fdt_getprop(blob, node, "reg", &len);
 	if (!cell)
 		return -ENOENT;

 	if (addrc != 2 || sizec != 2)
 		return -EINVAL;


 	ret = clk_get_by_index(dev, 0, &clk);
 	if (ret < 0) {
 		dev_err(dev, "Failed to get RPC clock\n");
 		return ret;
 	}

 	ret = clk_enable(&clk);
 	if (ret) {
 		dev_err(dev, "Failed to enable RPC clock\n");
 		return ret;
 	}

 	rpc_base = fdt_translate_address(blob, node, cell);
 	flash_base = fdt_translate_address(blob, node, cell + addrc + sizec);

 	flash_info[0].dev = dev;
 	flash_info[0].base = flash_base;
 	cfi_flash_num_flash_banks = 1;
 	gd->bd->bi_flashstart = flash_base;

 	return 0;
 }

 static const struct udevice_id rpc_hf_ids[] = {
 	{ .compatible = "renesas,r7s72100-rpc-if" },
 	{ .compatible = "renesas,rcar-gen3-rpc-if" },
 	{}
 };

 U_BOOT_DRIVER(rpc_hf) = {
 	.name		= "rpc_hf",
 	.id		= UCLASS_MTD,
 	.of_match	= rpc_hf_ids,
 	.bind		= rpc_hf_bind,
 	.probe		= rpc_hf_probe,
 };
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Renesas RCar Gen3 RPC HyperFlash driver
	*
	* Copyright (C) 2016 Renesas Electronics Corporation
	* Copyright (C) 2016 Cogent Embedded, Inc.
	* Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com>
	*/

	#include <common.h>
	#include <malloc.h>
	#include <asm/io.h>
	#include <clk.h>
	#include <dm.h>
	#include <dm/device_compat.h>
	#include <dm/of_access.h>
	#include <errno.h>
	#include <fdt_support.h>
	#include <flash.h>
	#include <mtd.h>
	#include <wait_bit.h>
	#include <linux/bitops.h>
	#include <mtd/cfi_flash.h>
	#include <asm/global_data.h>

	#define RPC_CMNCR 0x0000 /* R/W */
	#define RPC_CMNCR_MD BIT(31)
	#define RPC_CMNCR_MOIIO0(val) (((val) & 0x3) << 16)
	#define RPC_CMNCR_MOIIO1(val) (((val) & 0x3) << 18)
	#define RPC_CMNCR_MOIIO2(val) (((val) & 0x3) << 20)
	#define RPC_CMNCR_MOIIO3(val) (((val) & 0x3) << 22)
	#define RPC_CMNCR_MOIIO_HIZ (RPC_CMNCR_MOIIO0(3) \| RPC_CMNCR_MOIIO1(3) \| \
	RPC_CMNCR_MOIIO2(3) \| RPC_CMNCR_MOIIO3(3))
	#define RPC_CMNCR_IO0FV(val) (((val) & 0x3) << 8)
	#define RPC_CMNCR_IO2FV(val) (((val) & 0x3) << 12)
	#define RPC_CMNCR_IO3FV(val) (((val) & 0x3) << 14)
	#define RPC_CMNCR_IOFV_HIZ (RPC_CMNCR_IO0FV(3) \| RPC_CMNCR_IO2FV(3) \| \
	RPC_CMNCR_IO3FV(3))
	#define RPC_CMNCR_BSZ(val) (((val) & 0x3) << 0)

	#define RPC_SSLDR 0x0004 /* R/W */
	#define RPC_SSLDR_SPNDL(d) (((d) & 0x7) << 16)
	#define RPC_SSLDR_SLNDL(d) (((d) & 0x7) << 8)
	#define RPC_SSLDR_SCKDL(d) (((d) & 0x7) << 0)

	#define RPC_DRCR 0x000C /* R/W */
	#define RPC_DRCR_SSLN BIT(24)
	#define RPC_DRCR_RBURST(v) (((v) & 0x1F) << 16)
	#define RPC_DRCR_RCF BIT(9)
	#define RPC_DRCR_RBE BIT(8)
	#define RPC_DRCR_SSLE BIT(0)

	#define RPC_DRCMR 0x0010 /* R/W */
	#define RPC_DRCMR_CMD(c) (((c) & 0xFF) << 16)
	#define RPC_DRCMR_OCMD(c) (((c) & 0xFF) << 0)

	#define RPC_DREAR 0x0014 /* R/W */
	#define RPC_DREAR_EAV(v) (((v) & 0xFF) << 16)
	#define RPC_DREAR_EAC(v) (((v) & 0x7) << 0)

	#define RPC_DROPR 0x0018 /* R/W */
	#define RPC_DROPR_OPD3(o) (((o) & 0xFF) << 24)
	#define RPC_DROPR_OPD2(o) (((o) & 0xFF) << 16)
	#define RPC_DROPR_OPD1(o) (((o) & 0xFF) << 8)
	#define RPC_DROPR_OPD0(o) (((o) & 0xFF) << 0)

	#define RPC_DRENR 0x001C /* R/W */
	#define RPC_DRENR_CDB(o) (u32)((((o) & 0x3) << 30))
	#define RPC_DRENR_OCDB(o) (((o) & 0x3) << 28)
	#define RPC_DRENR_ADB(o) (((o) & 0x3) << 24)
	#define RPC_DRENR_OPDB(o) (((o) & 0x3) << 20)
	#define RPC_DRENR_SPIDB(o) (((o) & 0x3) << 16)
	#define RPC_DRENR_DME BIT(15)
	#define RPC_DRENR_CDE BIT(14)
	#define RPC_DRENR_OCDE BIT(12)
	#define RPC_DRENR_ADE(v) (((v) & 0xF) << 8)
	#define RPC_DRENR_OPDE(v) (((v) & 0xF) << 4)

	#define RPC_SMCR 0x0020 /* R/W */
	#define RPC_SMCR_SSLKP BIT(8)
	#define RPC_SMCR_SPIRE BIT(2)
	#define RPC_SMCR_SPIWE BIT(1)
	#define RPC_SMCR_SPIE BIT(0)

	#define RPC_SMCMR 0x0024 /* R/W */
	#define RPC_SMCMR_CMD(c) (((c) & 0xFF) << 16)
	#define RPC_SMCMR_OCMD(c) (((c) & 0xFF) << 0)

	#define RPC_SMADR 0x0028 /* R/W */
	#define RPC_SMOPR 0x002C /* R/W */
	#define RPC_SMOPR_OPD0(o) (((o) & 0xFF) << 0)
	#define RPC_SMOPR_OPD1(o) (((o) & 0xFF) << 8)
	#define RPC_SMOPR_OPD2(o) (((o) & 0xFF) << 16)
	#define RPC_SMOPR_OPD3(o) (((o) & 0xFF) << 24)

	#define RPC_SMENR 0x0030 /* R/W */
	#define RPC_SMENR_CDB(o) (((o) & 0x3) << 30)
	#define RPC_SMENR_OCDB(o) (((o) & 0x3) << 28)
	#define RPC_SMENR_ADB(o) (((o) & 0x3) << 24)
	#define RPC_SMENR_OPDB(o) (((o) & 0x3) << 20)
	#define RPC_SMENR_SPIDB(o) (((o) & 0x3) << 16)
	#define RPC_SMENR_DME BIT(15)
	#define RPC_SMENR_CDE BIT(14)
	#define RPC_SMENR_OCDE BIT(12)
	#define RPC_SMENR_ADE(v) (((v) & 0xF) << 8)
	#define RPC_SMENR_OPDE(v) (((v) & 0xF) << 4)
	#define RPC_SMENR_SPIDE(v) (((v) & 0xF) << 0)

	#define RPC_SMRDR0 0x0038 /* R */
	#define RPC_SMRDR1 0x003C /* R */
	#define RPC_SMWDR0 0x0040 /* R/W */
	#define RPC_SMWDR1 0x0044 /* R/W */
	#define RPC_CMNSR 0x0048 /* R */
	#define RPC_CMNSR_SSLF BIT(1)
	#define RPC_CMNSR_TEND BIT(0)

	#define RPC_DRDMCR 0x0058 /* R/W */
	#define RPC_DRDMCR_DMCYC(v) (((v) & 0xF) << 0)

	#define RPC_DRDRENR 0x005C /* R/W */
	#define RPC_DRDRENR_HYPE (0x5 << 12)
	#define RPC_DRDRENR_ADDRE BIT(8)
	#define RPC_DRDRENR_OPDRE BIT(4)
	#define RPC_DRDRENR_DRDRE BIT(0)

	#define RPC_SMDMCR 0x0060 /* R/W */
	#define RPC_SMDMCR_DMCYC(v) (((v) & 0xF) << 0)

	#define RPC_SMDRENR 0x0064 /* R/W */
	#define RPC_SMDRENR_HYPE (0x5 << 12)
	#define RPC_SMDRENR_ADDRE BIT(8)
	#define RPC_SMDRENR_OPDRE BIT(4)
	#define RPC_SMDRENR_SPIDRE BIT(0)

	#define RPC_PHYCNT 0x007C /* R/W */
	#define RPC_PHYCNT_CAL BIT(31)
	#define PRC_PHYCNT_OCTA_AA BIT(22)
	#define PRC_PHYCNT_OCTA_SA BIT(23)
	#define PRC_PHYCNT_EXDS BIT(21)
	#define RPC_PHYCNT_OCT BIT(20)
	#define RPC_PHYCNT_WBUF2 BIT(4)
	#define RPC_PHYCNT_WBUF BIT(2)
	#define RPC_PHYCNT_MEM(v) (((v) & 0x3) << 0)

	#define RPC_PHYINT 0x0088 /* R/W */
	#define RPC_PHYINT_RSTEN BIT(18)
	#define RPC_PHYINT_WPEN BIT(17)
	#define RPC_PHYINT_INTEN BIT(16)
	#define RPC_PHYINT_RST BIT(2)
	#define RPC_PHYINT_WP BIT(1)
	#define RPC_PHYINT_INT BIT(0)

	#define RPC_WBUF 0x8000 /* R/W size=4/8/16/32/64Bytes */
	#define RPC_WBUF_SIZE 0x100

	static phys_addr_t rpc_base;

	enum rpc_hf_size {
	RPC_HF_SIZE_16BIT = RPC_SMENR_SPIDE(0x8),
	RPC_HF_SIZE_32BIT = RPC_SMENR_SPIDE(0xC),
	RPC_HF_SIZE_64BIT = RPC_SMENR_SPIDE(0xF),
	};

	static int rpc_hf_wait_tend(void)
	{
	void __iomem reg = (void __iomem )rpc_base + RPC_CMNSR;
	return wait_for_bit_le32(reg, RPC_CMNSR_TEND, true, 1000, 0);
	}

	static int rpc_hf_mode(bool man)
	{
	int ret;

	ret = rpc_hf_wait_tend();
	if (ret)
	return ret;

	clrsetbits_le32(rpc_base + RPC_PHYCNT,
	RPC_PHYCNT_WBUF \| RPC_PHYCNT_WBUF2 \|
	RPC_PHYCNT_CAL \| RPC_PHYCNT_MEM(3),
	RPC_PHYCNT_CAL \| RPC_PHYCNT_MEM(3));

	clrsetbits_le32(rpc_base + RPC_CMNCR,
	RPC_CMNCR_MD \| RPC_CMNCR_BSZ(3),
	RPC_CMNCR_MOIIO_HIZ \| RPC_CMNCR_IOFV_HIZ \|
	(man ? RPC_CMNCR_MD : 0) \| RPC_CMNCR_BSZ(1));

	if (man)
	return 0;

	writel(RPC_DRCR_RBURST(0x1F) \| RPC_DRCR_RCF \| RPC_DRCR_RBE,
	rpc_base + RPC_DRCR);

	writel(RPC_DRCMR_CMD(0xA0), rpc_base + RPC_DRCMR);
	writel(RPC_DRENR_CDB(2) \| RPC_DRENR_OCDB(2) \| RPC_DRENR_ADB(2) \|
	RPC_DRENR_SPIDB(2) \| RPC_DRENR_CDE \| RPC_DRENR_OCDE \|
	RPC_DRENR_ADE(4), rpc_base + RPC_DRENR);
	writel(RPC_DRDMCR_DMCYC(0xE), rpc_base + RPC_DRDMCR);
	writel(RPC_DRDRENR_HYPE \| RPC_DRDRENR_ADDRE \| RPC_DRDRENR_DRDRE,
	rpc_base + RPC_DRDRENR);

	/* Dummy read */
	readl(rpc_base + RPC_DRCR);

	return 0;
	}

	static int rpc_hf_xfer(void addr, u64 wdata, u64 rdata,
	enum rpc_hf_size size, bool write)
	{
	int ret;
	u32 val;

	ret = rpc_hf_mode(1);
	if (ret)
	return ret;

	/* Submit HF address, SMCMR CMD[7] ~= CA Bit# 47 (R/nW) */
	writel(write ? 0 : RPC_SMCMR_CMD(0x80), rpc_base + RPC_SMCMR);
	writel((uintptr_t)addr >> 1, rpc_base + RPC_SMADR);
	writel(0x0, rpc_base + RPC_SMOPR);

	writel(RPC_SMDRENR_HYPE \| RPC_SMDRENR_ADDRE \| RPC_SMDRENR_SPIDRE,
	rpc_base + RPC_SMDRENR);

	val = RPC_SMENR_CDB(2) \| RPC_SMENR_OCDB(2) \|
	RPC_SMENR_ADB(2) \| RPC_SMENR_SPIDB(2) \|
	RPC_SMENR_CDE \| RPC_SMENR_OCDE \| RPC_SMENR_ADE(4) \| size;

	if (write) {
	writel(val, rpc_base + RPC_SMENR);

	if (size == RPC_HF_SIZE_64BIT)
	writeq(cpu_to_be64(wdata), rpc_base + RPC_SMWDR0);
	else
	writel(cpu_to_be32(wdata), rpc_base + RPC_SMWDR0);

	writel(RPC_SMCR_SPIWE \| RPC_SMCR_SPIE, rpc_base + RPC_SMCR);
	} else {
	val \|= RPC_SMENR_DME;

	writel(RPC_SMDMCR_DMCYC(0xE), rpc_base + RPC_SMDMCR);

	writel(val, rpc_base + RPC_SMENR);

	writel(RPC_SMCR_SPIRE \| RPC_SMCR_SPIE, rpc_base + RPC_SMCR);

	ret = rpc_hf_wait_tend();
	if (ret)
	return ret;

	if (size == RPC_HF_SIZE_64BIT)
	*rdata = be64_to_cpu(readq(rpc_base + RPC_SMRDR0));
	else
	*rdata = be32_to_cpu(readl(rpc_base + RPC_SMRDR0));
	}

	return rpc_hf_mode(0);
	}

	static void rpc_hf_write_cmd(void *addr, u64 wdata, enum rpc_hf_size size)
	{
	int ret;

	ret = rpc_hf_xfer(addr, wdata, NULL, size, 1);
	if (ret)
	printf("RPC: Write failed, ret=%i\n", ret);
	}

	static u64 rpc_hf_read_reg(void *addr, enum rpc_hf_size size)
	{
	u64 rdata = 0;
	int ret;

	ret = rpc_hf_xfer(addr, 0, &rdata, size, 0);
	if (ret)
	printf("RPC: Read failed, ret=%i\n", ret);

	return rdata;
	}

	void flash_write8(u8 value, void *addr)
	{
	rpc_hf_write_cmd(addr, value, RPC_HF_SIZE_16BIT);
	}

	void flash_write16(u16 value, void *addr)
	{
	rpc_hf_write_cmd(addr, value, RPC_HF_SIZE_16BIT);
	}

	void flash_write32(u32 value, void *addr)
	{
	rpc_hf_write_cmd(addr, value, RPC_HF_SIZE_32BIT);
	}

	void flash_write64(u64 value, void *addr)
	{
	rpc_hf_write_cmd(addr, value, RPC_HF_SIZE_64BIT);
	}

	u8 flash_read8(void *addr)
	{
	return rpc_hf_read_reg(addr, RPC_HF_SIZE_16BIT);
	}

	u16 flash_read16(void *addr)
	{
	return rpc_hf_read_reg(addr, RPC_HF_SIZE_16BIT);
	}

	u32 flash_read32(void *addr)
	{
	return rpc_hf_read_reg(addr, RPC_HF_SIZE_32BIT);
	}

	u64 flash_read64(void *addr)
	{
	return rpc_hf_read_reg(addr, RPC_HF_SIZE_64BIT);
	}

	static int rpc_hf_bind(struct udevice *parent)
	{
	const void *fdt = gd->fdt_blob;
	ofnode node;
	int ret, off;

	/*
	* Check if there are any SPI NOR child nodes, if so, do NOT bind
	* as this controller will be operated by the QSPI driver instead.
	*/
	dev_for_each_subnode(node, parent) {
	off = ofnode_to_offset(node);

	ret = fdt_node_check_compatible(fdt, off, "spi-flash");
	if (!ret)
	return -ENODEV;

	ret = fdt_node_check_compatible(fdt, off, "jedec,spi-nor");
	if (!ret)
	return -ENODEV;
	}

	return 0;
	}

	static int rpc_hf_probe(struct udevice *dev)
	{
	void blob = (void )gd->fdt_blob;
	const fdt32_t *cell;
	int node = dev_of_offset(dev);
	int parent, addrc, sizec, len, ret;
	struct clk clk;
	phys_addr_t flash_base;

	parent = fdt_parent_offset(blob, node);
	fdt_support_default_count_cells(blob, parent, &addrc, &sizec);
	cell = fdt_getprop(blob, node, "reg", &len);
	if (!cell)
	return -ENOENT;

	if (addrc != 2 \|\| sizec != 2)
	return -EINVAL;


	ret = clk_get_by_index(dev, 0, &clk);
	if (ret < 0) {
	dev_err(dev, "Failed to get RPC clock\n");
	return ret;
	}

	ret = clk_enable(&clk);
	if (ret) {
	dev_err(dev, "Failed to enable RPC clock\n");
	return ret;
	}

	rpc_base = fdt_translate_address(blob, node, cell);
	flash_base = fdt_translate_address(blob, node, cell + addrc + sizec);

	flash_info[0].dev = dev;
	flash_info[0].base = flash_base;
	cfi_flash_num_flash_banks = 1;
	gd->bd->bi_flashstart = flash_base;

	return 0;
	}

	static const struct udevice_id rpc_hf_ids[] = {
	{ .compatible = "renesas,r7s72100-rpc-if" },
	{ .compatible = "renesas,rcar-gen3-rpc-if" },
	{}
	};

	U_BOOT_DRIVER(rpc_hf) = {
	.name = "rpc_hf",
	.id = UCLASS_MTD,
	.of_match = rpc_hf_ids,
	.bind = rpc_hf_bind,
	.probe = rpc_hf_probe,
	};