drivers/spi/renesas_rpc_spi.c - github/trini/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Renesas RCar Gen3 RPC QSPI driver
  *
  * Copyright (C) 2018 Marek Vasut <marek.vasut@gmail.com>
  */

 #include <common.h>
 #include <asm/global_data.h>
 #include <asm/io.h>
 #include <clk.h>
 #include <dm.h>
 #include <dm/of_access.h>
 #include <dt-structs.h>
 #include <errno.h>
 #include <linux/bitops.h>
 #include <linux/bug.h>
 #include <linux/errno.h>
 #include <spi.h>
 #include <wait_bit.h>

 #define RPC_CMNCR		0x0000	/* R/W */
 #define RPC_CMNCR_MD		BIT(31)
 #define RPC_CMNCR_SFDE		BIT(24)
 #define RPC_CMNCR_MOIIO3(val)	(((val) & 0x3) << 22)
 #define RPC_CMNCR_MOIIO2(val)	(((val) & 0x3) << 20)
 #define RPC_CMNCR_MOIIO1(val)	(((val) & 0x3) << 18)
 #define RPC_CMNCR_MOIIO0(val)	(((val) & 0x3) << 16)
 #define RPC_CMNCR_MOIIO_HIZ	(RPC_CMNCR_MOIIO0(3) | RPC_CMNCR_MOIIO1(3) | \
 				 RPC_CMNCR_MOIIO2(3) | RPC_CMNCR_MOIIO3(3))
 #define RPC_CMNCR_IO3FV(val)	(((val) & 0x3) << 14)
 #define RPC_CMNCR_IO2FV(val)	(((val) & 0x3) << 12)
 #define RPC_CMNCR_IO0FV(val)	(((val) & 0x3) << 8)
 #define RPC_CMNCR_IOFV_HIZ	(RPC_CMNCR_IO0FV(3) | RPC_CMNCR_IO2FV(3) | \
 				 RPC_CMNCR_IO3FV(3))
 #define RPC_CMNCR_CPHAT		BIT(6)
 #define RPC_CMNCR_CPHAR		BIT(5)
 #define RPC_CMNCR_SSLP		BIT(4)
 #define RPC_CMNCR_CPOL		BIT(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_STRTIM(v)	(((v) & 0x7) << 15)
 #define RPC_PHYCNT_STRTIM2(v)	((((v) & 0x7) << 15) | (((v) & 0x8) << 24))
 #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

 DECLARE_GLOBAL_DATA_PTR;

 struct rpc_spi_plat {
 	fdt_addr_t	regs;
 	fdt_addr_t	extr;
 	s32		freq;	/* Default clock freq, -1 for none */
 };

 struct rpc_spi_priv {
 	fdt_addr_t	regs;
 	fdt_addr_t	extr;
 	struct clk	clk;

 	u8		cmdcopy[8];
 	u32		cmdlen;
 	bool		cmdstarted;
 };

 static int rpc_spi_wait_sslf(struct udevice *dev)
 {
 	struct rpc_spi_priv *priv = dev_get_priv(dev->parent);

 	return wait_for_bit_le32((void *)priv->regs + RPC_CMNSR, RPC_CMNSR_SSLF,
 				 false, 1000, false);
 }

 static int rpc_spi_wait_tend(struct udevice *dev)
 {
 	struct rpc_spi_priv *priv = dev_get_priv(dev->parent);

 	return wait_for_bit_le32((void *)priv->regs + RPC_CMNSR, RPC_CMNSR_TEND,
 				 true, 1000, false);
 }

 static void rpc_spi_flush_read_cache(struct udevice *dev)
 {
 	struct udevice *bus = dev->parent;
 	struct rpc_spi_priv *priv = dev_get_priv(bus);

 	/* Flush read cache */
 	writel(RPC_DRCR_SSLN | RPC_DRCR_RBURST(0x1f) |
 	       RPC_DRCR_RCF | RPC_DRCR_RBE | RPC_DRCR_SSLE,
 	       priv->regs + RPC_DRCR);
 	readl(priv->regs + RPC_DRCR);

 }

 static u32 rpc_spi_get_strobe_delay(void)
 {
 #ifndef CONFIG_RZA1
 	u32 cpu_type = rmobile_get_cpu_type();

 	/*
 	 * NOTE: RPC_PHYCNT_STRTIM value:
 	 *       0: On H3 ES1.x (not supported in mainline U-Boot)
 	 *       6: On M3 ES1.x
 	 *       7: On other R-Car Gen3
 	 *      15: On R-Car Gen4
 	 */
 	if (cpu_type == RMOBILE_CPU_TYPE_R8A7796 && rmobile_get_cpu_rev_integer() == 1)
 		return RPC_PHYCNT_STRTIM(6);
 	else if (cpu_type == RMOBILE_CPU_TYPE_R8A779F0 ||
 		 cpu_type == RMOBILE_CPU_TYPE_R8A779G0)
 		return RPC_PHYCNT_STRTIM2(15);
 	else
 #endif
 		return RPC_PHYCNT_STRTIM(7);
 }

 static int rpc_spi_claim_bus(struct udevice *dev, bool manual)
 {
 	struct udevice *bus = dev->parent;
 	struct rpc_spi_priv *priv = dev_get_priv(bus);

 	/* NOTE: The 0x260 are undocumented bits, but they must be set. */
 	writel(RPC_PHYCNT_CAL | rpc_spi_get_strobe_delay() | 0x260,
 	       priv->regs + RPC_PHYCNT);
 	writel((manual ? RPC_CMNCR_MD : 0) | RPC_CMNCR_SFDE |
 		 RPC_CMNCR_MOIIO_HIZ | RPC_CMNCR_IOFV_HIZ | RPC_CMNCR_BSZ(0),
 		 priv->regs + RPC_CMNCR);

 	writel(RPC_SSLDR_SPNDL(7) | RPC_SSLDR_SLNDL(7) |
 	       RPC_SSLDR_SCKDL(7), priv->regs + RPC_SSLDR);

 	rpc_spi_flush_read_cache(dev);

 	return 0;
 }

 static int rpc_spi_release_bus(struct udevice *dev)
 {
 	struct udevice *bus = dev->parent;
 	struct rpc_spi_priv *priv = dev_get_priv(bus);

 	/* NOTE: The 0x260 are undocumented bits, but they must be set. */
 	writel(rpc_spi_get_strobe_delay() | 0x260, priv->regs + RPC_PHYCNT);

 	rpc_spi_flush_read_cache(dev);

 	return 0;
 }

 static int rpc_spi_xfer(struct udevice *dev, unsigned int bitlen,
 			const void *dout, void *din, unsigned long flags)
 {
 	struct udevice *bus = dev->parent;
 	struct rpc_spi_priv *priv = dev_get_priv(bus);
 	u32 wlen = dout ? (bitlen / 8) : 0;
 	u32 rlen = din ? (bitlen / 8) : 0;
 	u32 wloop = DIV_ROUND_UP(wlen, 4);
 	u32 smenr, smcr, offset;
 	int ret = 0;

 	if (!priv->cmdstarted) {
 		if (!wlen || rlen)
 			BUG();

 		memcpy(priv->cmdcopy, dout, wlen);
 		priv->cmdlen = wlen;

 		/* Command transfer start */
 		priv->cmdstarted = true;
 		if (!(flags & SPI_XFER_END))
 			return 0;
 	}

 	offset = (priv->cmdcopy[1] << 16) | (priv->cmdcopy[2] << 8) |
 		 (priv->cmdcopy[3] << 0);

 	smenr = 0;

 	if (wlen || (!rlen && !wlen) || flags == SPI_XFER_ONCE) {
 		if (wlen && flags == SPI_XFER_END)
 			smenr = RPC_SMENR_SPIDE(0xf);

 		rpc_spi_claim_bus(dev, true);

 		writel(0, priv->regs + RPC_SMCR);

 		if (priv->cmdlen >= 1) {	/* Command(1) */
 			writel(RPC_SMCMR_CMD(priv->cmdcopy[0]),
 			       priv->regs + RPC_SMCMR);
 			smenr |= RPC_SMENR_CDE;
 		} else {
 			writel(0, priv->regs + RPC_SMCMR);
 		}

 		if (priv->cmdlen >= 4) {	/* Address(3) */
 			writel(offset, priv->regs + RPC_SMADR);
 			smenr |= RPC_SMENR_ADE(7);
 		} else {
 			writel(0, priv->regs + RPC_SMADR);
 		}

 		if (priv->cmdlen >= 5) {	/* Dummy(n) */
 			writel(8 * (priv->cmdlen - 4) - 1,
 			       priv->regs + RPC_SMDMCR);
 			smenr |= RPC_SMENR_DME;
 		} else {
 			writel(0, priv->regs + RPC_SMDMCR);
 		}

 		writel(0, priv->regs + RPC_SMOPR);

 		writel(0, priv->regs + RPC_SMDRENR);

 		if (wlen && flags == SPI_XFER_END) {
 			u32 *datout = (u32 *)dout;

 			while (wloop--) {
 				smcr = RPC_SMCR_SPIWE | RPC_SMCR_SPIE;
 				if (wloop >= 1)
 					smcr |= RPC_SMCR_SSLKP;
 				writel(smenr, priv->regs + RPC_SMENR);
 				writel(*datout, priv->regs + RPC_SMWDR0);
 				writel(smcr, priv->regs + RPC_SMCR);
 				ret = rpc_spi_wait_tend(dev);
 				if (ret)
 					goto err;
 				datout++;
 				smenr = RPC_SMENR_SPIDE(0xf);
 			}

 			ret = rpc_spi_wait_sslf(dev);

 		} else {
 			writel(smenr, priv->regs + RPC_SMENR);
 			writel(RPC_SMCR_SPIE, priv->regs + RPC_SMCR);
 			ret = rpc_spi_wait_tend(dev);
 		}
 	} else {	/* Read data only, using DRx ext access */
 		rpc_spi_claim_bus(dev, false);

 		if (priv->cmdlen >= 1) {	/* Command(1) */
 			writel(RPC_DRCMR_CMD(priv->cmdcopy[0]),
 			       priv->regs + RPC_DRCMR);
 			smenr |= RPC_DRENR_CDE;
 		} else {
 			writel(0, priv->regs + RPC_DRCMR);
 		}

 		if (priv->cmdlen >= 4)		/* Address(3) */
 			smenr |= RPC_DRENR_ADE(7);

 		if (priv->cmdlen >= 5) {	/* Dummy(n) */
 			writel(8 * (priv->cmdlen - 4) - 1,
 			       priv->regs + RPC_DRDMCR);
 			smenr |= RPC_DRENR_DME;
 		} else {
 			writel(0, priv->regs + RPC_DRDMCR);
 		}

 		writel(0, priv->regs + RPC_DROPR);

 		writel(smenr, priv->regs + RPC_DRENR);

 		if (rlen)
 			memcpy_fromio(din, (void *)(priv->extr + offset), rlen);
 		else
 			readl(priv->extr);	/* Dummy read */
 	}

 err:
 	priv->cmdstarted = false;

 	rpc_spi_release_bus(dev);

 	return ret;
 }

 static int rpc_spi_set_speed(struct udevice *bus, uint speed)
 {
 	/* This is a SPI NOR controller, do nothing. */
 	return 0;
 }

 static int rpc_spi_set_mode(struct udevice *bus, uint mode)
 {
 	/* This is a SPI NOR controller, do nothing. */
 	return 0;
 }

 static int rpc_spi_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, bind as
 	 * this controller will be operated in SPI mode.
 	 */
 	dev_for_each_subnode(node, parent) {
 		off = ofnode_to_offset(node);

 		ret = fdt_node_check_compatible(fdt, off, "spi-flash");
 		if (!ret)
 			return 0;

 		ret = fdt_node_check_compatible(fdt, off, "jedec,spi-nor");
 		if (!ret)
 			return 0;
 	}

 	return -ENODEV;
 }

 static int rpc_spi_probe(struct udevice *dev)
 {
 	struct rpc_spi_plat *plat = dev_get_plat(dev);
 	struct rpc_spi_priv *priv = dev_get_priv(dev);

 	priv->regs = plat->regs;
 	priv->extr = plat->extr;
 #if CONFIG_IS_ENABLED(CLK)
 	clk_enable(&priv->clk);
 #endif
 	return 0;
 }

 static int rpc_spi_of_to_plat(struct udevice *bus)
 {
 	struct rpc_spi_plat *plat = dev_get_plat(bus);

 	plat->regs = dev_read_addr_index(bus, 0);
 	plat->extr = dev_read_addr_index(bus, 1);

 #if CONFIG_IS_ENABLED(CLK)
 	struct rpc_spi_priv *priv = dev_get_priv(bus);
 	int ret;

 	ret = clk_get_by_index(bus, 0, &priv->clk);
 	if (ret < 0) {
 		printf("%s: Could not get clock for %s: %d\n",
 		       __func__, bus->name, ret);
 		return ret;
 	}
 #endif

 	plat->freq = dev_read_u32_default(bus, "spi-max-freq", 50000000);

 	return 0;
 }

 static const struct dm_spi_ops rpc_spi_ops = {
 	.xfer		= rpc_spi_xfer,
 	.set_speed	= rpc_spi_set_speed,
 	.set_mode	= rpc_spi_set_mode,
 };

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

 U_BOOT_DRIVER(rpc_spi) = {
 	.name		= "rpc_spi",
 	.id		= UCLASS_SPI,
 	.of_match	= rpc_spi_ids,
 	.ops		= &rpc_spi_ops,
 	.of_to_plat = rpc_spi_of_to_plat,
 	.plat_auto	= sizeof(struct rpc_spi_plat),
 	.priv_auto	= sizeof(struct rpc_spi_priv),
 	.bind		= rpc_spi_bind,
 	.probe		= rpc_spi_probe,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Renesas RCar Gen3 RPC QSPI driver
	*
	* Copyright (C) 2018 Marek Vasut <marek.vasut@gmail.com>
	*/

	#include <common.h>
	#include <asm/global_data.h>
	#include <asm/io.h>
	#include <clk.h>
	#include <dm.h>
	#include <dm/of_access.h>
	#include <dt-structs.h>
	#include <errno.h>
	#include <linux/bitops.h>
	#include <linux/bug.h>
	#include <linux/errno.h>
	#include <spi.h>
	#include <wait_bit.h>

	#define RPC_CMNCR 0x0000 /* R/W */
	#define RPC_CMNCR_MD BIT(31)
	#define RPC_CMNCR_SFDE BIT(24)
	#define RPC_CMNCR_MOIIO3(val) (((val) & 0x3) << 22)
	#define RPC_CMNCR_MOIIO2(val) (((val) & 0x3) << 20)
	#define RPC_CMNCR_MOIIO1(val) (((val) & 0x3) << 18)
	#define RPC_CMNCR_MOIIO0(val) (((val) & 0x3) << 16)
	#define RPC_CMNCR_MOIIO_HIZ (RPC_CMNCR_MOIIO0(3) \| RPC_CMNCR_MOIIO1(3) \| \
	RPC_CMNCR_MOIIO2(3) \| RPC_CMNCR_MOIIO3(3))
	#define RPC_CMNCR_IO3FV(val) (((val) & 0x3) << 14)
	#define RPC_CMNCR_IO2FV(val) (((val) & 0x3) << 12)
	#define RPC_CMNCR_IO0FV(val) (((val) & 0x3) << 8)
	#define RPC_CMNCR_IOFV_HIZ (RPC_CMNCR_IO0FV(3) \| RPC_CMNCR_IO2FV(3) \| \
	RPC_CMNCR_IO3FV(3))
	#define RPC_CMNCR_CPHAT BIT(6)
	#define RPC_CMNCR_CPHAR BIT(5)
	#define RPC_CMNCR_SSLP BIT(4)
	#define RPC_CMNCR_CPOL BIT(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_STRTIM(v) (((v) & 0x7) << 15)
	#define RPC_PHYCNT_STRTIM2(v) ((((v) & 0x7) << 15) \| (((v) & 0x8) << 24))
	#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

	DECLARE_GLOBAL_DATA_PTR;

	struct rpc_spi_plat {
	fdt_addr_t regs;
	fdt_addr_t extr;
	s32 freq; /* Default clock freq, -1 for none */
	};

	struct rpc_spi_priv {
	fdt_addr_t regs;
	fdt_addr_t extr;
	struct clk clk;

	u8 cmdcopy[8];
	u32 cmdlen;
	bool cmdstarted;
	};

	static int rpc_spi_wait_sslf(struct udevice *dev)
	{
	struct rpc_spi_priv *priv = dev_get_priv(dev->parent);

	return wait_for_bit_le32((void *)priv->regs + RPC_CMNSR, RPC_CMNSR_SSLF,
	false, 1000, false);
	}

	static int rpc_spi_wait_tend(struct udevice *dev)
	{
	struct rpc_spi_priv *priv = dev_get_priv(dev->parent);

	return wait_for_bit_le32((void *)priv->regs + RPC_CMNSR, RPC_CMNSR_TEND,
	true, 1000, false);
	}

	static void rpc_spi_flush_read_cache(struct udevice *dev)
	{
	struct udevice *bus = dev->parent;
	struct rpc_spi_priv *priv = dev_get_priv(bus);

	/* Flush read cache */
	writel(RPC_DRCR_SSLN \| RPC_DRCR_RBURST(0x1f) \|
	RPC_DRCR_RCF \| RPC_DRCR_RBE \| RPC_DRCR_SSLE,
	priv->regs + RPC_DRCR);
	readl(priv->regs + RPC_DRCR);

	}

	static u32 rpc_spi_get_strobe_delay(void)
	{
	#ifndef CONFIG_RZA1
	u32 cpu_type = rmobile_get_cpu_type();

	/*
	* NOTE: RPC_PHYCNT_STRTIM value:
	* 0: On H3 ES1.x (not supported in mainline U-Boot)
	* 6: On M3 ES1.x
	* 7: On other R-Car Gen3
	* 15: On R-Car Gen4
	*/
	if (cpu_type == RMOBILE_CPU_TYPE_R8A7796 && rmobile_get_cpu_rev_integer() == 1)
	return RPC_PHYCNT_STRTIM(6);
	else if (cpu_type == RMOBILE_CPU_TYPE_R8A779F0 \|\|
	cpu_type == RMOBILE_CPU_TYPE_R8A779G0)
	return RPC_PHYCNT_STRTIM2(15);
	else
	#endif
	return RPC_PHYCNT_STRTIM(7);
	}

	static int rpc_spi_claim_bus(struct udevice *dev, bool manual)
	{
	struct udevice *bus = dev->parent;
	struct rpc_spi_priv *priv = dev_get_priv(bus);

	/* NOTE: The 0x260 are undocumented bits, but they must be set. */
	writel(RPC_PHYCNT_CAL \| rpc_spi_get_strobe_delay() \| 0x260,
	priv->regs + RPC_PHYCNT);
	writel((manual ? RPC_CMNCR_MD : 0) \| RPC_CMNCR_SFDE \|
	RPC_CMNCR_MOIIO_HIZ \| RPC_CMNCR_IOFV_HIZ \| RPC_CMNCR_BSZ(0),
	priv->regs + RPC_CMNCR);

	writel(RPC_SSLDR_SPNDL(7) \| RPC_SSLDR_SLNDL(7) \|
	RPC_SSLDR_SCKDL(7), priv->regs + RPC_SSLDR);

	rpc_spi_flush_read_cache(dev);

	return 0;
	}

	static int rpc_spi_release_bus(struct udevice *dev)
	{
	struct udevice *bus = dev->parent;
	struct rpc_spi_priv *priv = dev_get_priv(bus);

	/* NOTE: The 0x260 are undocumented bits, but they must be set. */
	writel(rpc_spi_get_strobe_delay() \| 0x260, priv->regs + RPC_PHYCNT);

	rpc_spi_flush_read_cache(dev);

	return 0;
	}

	static int rpc_spi_xfer(struct udevice *dev, unsigned int bitlen,
	const void dout, void din, unsigned long flags)
	{
	struct udevice *bus = dev->parent;
	struct rpc_spi_priv *priv = dev_get_priv(bus);
	u32 wlen = dout ? (bitlen / 8) : 0;
	u32 rlen = din ? (bitlen / 8) : 0;
	u32 wloop = DIV_ROUND_UP(wlen, 4);
	u32 smenr, smcr, offset;
	int ret = 0;

	if (!priv->cmdstarted) {
	if (!wlen \|\| rlen)
	BUG();

	memcpy(priv->cmdcopy, dout, wlen);
	priv->cmdlen = wlen;

	/* Command transfer start */
	priv->cmdstarted = true;
	if (!(flags & SPI_XFER_END))
	return 0;
	}

	offset = (priv->cmdcopy[1] << 16) \| (priv->cmdcopy[2] << 8) \|
	(priv->cmdcopy[3] << 0);

	smenr = 0;

	if (wlen \|\| (!rlen && !wlen) \|\| flags == SPI_XFER_ONCE) {
	if (wlen && flags == SPI_XFER_END)
	smenr = RPC_SMENR_SPIDE(0xf);

	rpc_spi_claim_bus(dev, true);

	writel(0, priv->regs + RPC_SMCR);

	if (priv->cmdlen >= 1) { /* Command(1) */
	writel(RPC_SMCMR_CMD(priv->cmdcopy[0]),
	priv->regs + RPC_SMCMR);
	smenr \|= RPC_SMENR_CDE;
	} else {
	writel(0, priv->regs + RPC_SMCMR);
	}

	if (priv->cmdlen >= 4) { /* Address(3) */
	writel(offset, priv->regs + RPC_SMADR);
	smenr \|= RPC_SMENR_ADE(7);
	} else {
	writel(0, priv->regs + RPC_SMADR);
	}

	if (priv->cmdlen >= 5) { /* Dummy(n) */
	writel(8 * (priv->cmdlen - 4) - 1,
	priv->regs + RPC_SMDMCR);
	smenr \|= RPC_SMENR_DME;
	} else {
	writel(0, priv->regs + RPC_SMDMCR);
	}

	writel(0, priv->regs + RPC_SMOPR);

	writel(0, priv->regs + RPC_SMDRENR);

	if (wlen && flags == SPI_XFER_END) {
	u32 datout = (u32 )dout;

	while (wloop--) {
	smcr = RPC_SMCR_SPIWE \| RPC_SMCR_SPIE;
	if (wloop >= 1)
	smcr \|= RPC_SMCR_SSLKP;
	writel(smenr, priv->regs + RPC_SMENR);
	writel(*datout, priv->regs + RPC_SMWDR0);
	writel(smcr, priv->regs + RPC_SMCR);
	ret = rpc_spi_wait_tend(dev);
	if (ret)
	goto err;
	datout++;
	smenr = RPC_SMENR_SPIDE(0xf);
	}

	ret = rpc_spi_wait_sslf(dev);

	} else {
	writel(smenr, priv->regs + RPC_SMENR);
	writel(RPC_SMCR_SPIE, priv->regs + RPC_SMCR);
	ret = rpc_spi_wait_tend(dev);
	}
	} else { /* Read data only, using DRx ext access */
	rpc_spi_claim_bus(dev, false);

	if (priv->cmdlen >= 1) { /* Command(1) */
	writel(RPC_DRCMR_CMD(priv->cmdcopy[0]),
	priv->regs + RPC_DRCMR);
	smenr \|= RPC_DRENR_CDE;
	} else {
	writel(0, priv->regs + RPC_DRCMR);
	}

	if (priv->cmdlen >= 4) /* Address(3) */
	smenr \|= RPC_DRENR_ADE(7);

	if (priv->cmdlen >= 5) { /* Dummy(n) */
	writel(8 * (priv->cmdlen - 4) - 1,
	priv->regs + RPC_DRDMCR);
	smenr \|= RPC_DRENR_DME;
	} else {
	writel(0, priv->regs + RPC_DRDMCR);
	}

	writel(0, priv->regs + RPC_DROPR);

	writel(smenr, priv->regs + RPC_DRENR);

	if (rlen)
	memcpy_fromio(din, (void *)(priv->extr + offset), rlen);
	else
	readl(priv->extr); /* Dummy read */
	}

	err:
	priv->cmdstarted = false;

	rpc_spi_release_bus(dev);

	return ret;
	}

	static int rpc_spi_set_speed(struct udevice *bus, uint speed)
	{
	/* This is a SPI NOR controller, do nothing. */
	return 0;
	}

	static int rpc_spi_set_mode(struct udevice *bus, uint mode)
	{
	/* This is a SPI NOR controller, do nothing. */
	return 0;
	}

	static int rpc_spi_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, bind as
	* this controller will be operated in SPI mode.
	*/
	dev_for_each_subnode(node, parent) {
	off = ofnode_to_offset(node);

	ret = fdt_node_check_compatible(fdt, off, "spi-flash");
	if (!ret)
	return 0;

	ret = fdt_node_check_compatible(fdt, off, "jedec,spi-nor");
	if (!ret)
	return 0;
	}

	return -ENODEV;
	}

	static int rpc_spi_probe(struct udevice *dev)
	{
	struct rpc_spi_plat *plat = dev_get_plat(dev);
	struct rpc_spi_priv *priv = dev_get_priv(dev);

	priv->regs = plat->regs;
	priv->extr = plat->extr;
	#if CONFIG_IS_ENABLED(CLK)
	clk_enable(&priv->clk);
	#endif
	return 0;
	}

	static int rpc_spi_of_to_plat(struct udevice *bus)
	{
	struct rpc_spi_plat *plat = dev_get_plat(bus);

	plat->regs = dev_read_addr_index(bus, 0);
	plat->extr = dev_read_addr_index(bus, 1);

	#if CONFIG_IS_ENABLED(CLK)
	struct rpc_spi_priv *priv = dev_get_priv(bus);
	int ret;

	ret = clk_get_by_index(bus, 0, &priv->clk);
	if (ret < 0) {
	printf("%s: Could not get clock for %s: %d\n",
	__func__, bus->name, ret);
	return ret;
	}
	#endif

	plat->freq = dev_read_u32_default(bus, "spi-max-freq", 50000000);

	return 0;
	}

	static const struct dm_spi_ops rpc_spi_ops = {
	.xfer = rpc_spi_xfer,
	.set_speed = rpc_spi_set_speed,
	.set_mode = rpc_spi_set_mode,
	};

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

	U_BOOT_DRIVER(rpc_spi) = {
	.name = "rpc_spi",
	.id = UCLASS_SPI,
	.of_match = rpc_spi_ids,
	.ops = &rpc_spi_ops,
	.of_to_plat = rpc_spi_of_to_plat,
	.plat_auto = sizeof(struct rpc_spi_plat),
	.priv_auto = sizeof(struct rpc_spi_priv),
	.bind = rpc_spi_bind,
	.probe = rpc_spi_probe,
	};