[u-boot.git] / drivers / spi / renesas_rpc_spi.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Renesas RCar Gen3 RPC QSPI driver
 *
 * Copyright (C) 2018 Marek Vasut <[email protected]>
 */

#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_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 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.
	 * NOTE: On H3 ES1.x (not supported in mainline U-Boot), the
	 *       RPC_PHYCNT_STRTIM shall be 0, while on newer parts, the
	 *       RPC_PHYCNT_STRTIM shall be 6.
	 */
	writel(RPC_PHYCNT_CAL | RPC_PHYCNT_STRTIM(6) | 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_PHYCNT_STRTIM(6) | 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,rpc-r7s72100" },
	{ .compatible = "renesas,rpc-r8a7795" },
	{ .compatible = "renesas,rpc-r8a7796" },
	{ .compatible = "renesas,rpc-r8a77965" },
	{ .compatible = "renesas,rpc-r8a77970" },
	{ .compatible = "renesas,rpc-r8a77995" },
	{ .compatible = "renesas,rcar-gen3-rpc" },
	{ }
};

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,
};
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
fbebea27 MV	2	/*
	3	* Renesas RCar Gen3 RPC QSPI driver
	4	*
	5	* Copyright (C) 2018 Marek Vasut <[email protected]>
fbebea27 MV	6	*/
	7
	8	#include <common.h>
401d1c4f	9	#include <asm/global_data.h>
fbebea27 MV	10	#include <asm/io.h>
	11	#include <clk.h>
	12	#include <dm.h>
	13	#include <dm/of_access.h>
	14	#include <dt-structs.h>
	15	#include <errno.h>
cd93d625	16	#include <linux/bitops.h>
eb41d8a1	17	#include <linux/bug.h>
fbebea27 MV	18	#include <linux/errno.h>
	19	#include <spi.h>
	20	#include <wait_bit.h>
	21
	22	#define RPC_CMNCR 0x0000 /* R/W */
	23	#define RPC_CMNCR_MD BIT(31)
	24	#define RPC_CMNCR_SFDE BIT(24)
	25	#define RPC_CMNCR_MOIIO3(val) (((val) & 0x3) << 22)
	26	#define RPC_CMNCR_MOIIO2(val) (((val) & 0x3) << 20)
	27	#define RPC_CMNCR_MOIIO1(val) (((val) & 0x3) << 18)
	28	#define RPC_CMNCR_MOIIO0(val) (((val) & 0x3) << 16)
	29	#define RPC_CMNCR_MOIIO_HIZ (RPC_CMNCR_MOIIO0(3) \| RPC_CMNCR_MOIIO1(3) \| \
	30	RPC_CMNCR_MOIIO2(3) \| RPC_CMNCR_MOIIO3(3))
	31	#define RPC_CMNCR_IO3FV(val) (((val) & 0x3) << 14)
	32	#define RPC_CMNCR_IO2FV(val) (((val) & 0x3) << 12)
	33	#define RPC_CMNCR_IO0FV(val) (((val) & 0x3) << 8)
	34	#define RPC_CMNCR_IOFV_HIZ (RPC_CMNCR_IO0FV(3) \| RPC_CMNCR_IO2FV(3) \| \
	35	RPC_CMNCR_IO3FV(3))
	36	#define RPC_CMNCR_CPHAT BIT(6)
	37	#define RPC_CMNCR_CPHAR BIT(5)
	38	#define RPC_CMNCR_SSLP BIT(4)
	39	#define RPC_CMNCR_CPOL BIT(3)
	40	#define RPC_CMNCR_BSZ(val) (((val) & 0x3) << 0)
	41
	42	#define RPC_SSLDR 0x0004 /* R/W */
	43	#define RPC_SSLDR_SPNDL(d) (((d) & 0x7) << 16)
	44	#define RPC_SSLDR_SLNDL(d) (((d) & 0x7) << 8)
	45	#define RPC_SSLDR_SCKDL(d) (((d) & 0x7) << 0)
	46
	47	#define RPC_DRCR 0x000C /* R/W */
	48	#define RPC_DRCR_SSLN BIT(24)
	49	#define RPC_DRCR_RBURST(v) (((v) & 0x1F) << 16)
	50	#define RPC_DRCR_RCF BIT(9)
	51	#define RPC_DRCR_RBE BIT(8)
	52	#define RPC_DRCR_SSLE BIT(0)
	53
	54	#define RPC_DRCMR 0x0010 /* R/W */
	55	#define RPC_DRCMR_CMD(c) (((c) & 0xFF) << 16)
	56	#define RPC_DRCMR_OCMD(c) (((c) & 0xFF) << 0)
	57
	58	#define RPC_DREAR 0x0014 /* R/W */
	59	#define RPC_DREAR_EAV(v) (((v) & 0xFF) << 16)
	60	#define RPC_DREAR_EAC(v) (((v) & 0x7) << 0)
	61
	62	#define RPC_DROPR 0x0018 /* R/W */
	63	#define RPC_DROPR_OPD3(o) (((o) & 0xFF) << 24)
	64	#define RPC_DROPR_OPD2(o) (((o) & 0xFF) << 16)
	65	#define RPC_DROPR_OPD1(o) (((o) & 0xFF) << 8)
	66	#define RPC_DROPR_OPD0(o) (((o) & 0xFF) << 0)
	67
	68	#define RPC_DRENR 0x001C /* R/W */
	69	#define RPC_DRENR_CDB(o) (u32)((((o) & 0x3) << 30))
	70	#define RPC_DRENR_OCDB(o) (((o) & 0x3) << 28)
	71	#define RPC_DRENR_ADB(o) (((o) & 0x3) << 24)
	72	#define RPC_DRENR_OPDB(o) (((o) & 0x3) << 20)
	73	#define RPC_DRENR_SPIDB(o) (((o) & 0x3) << 16)
	74	#define RPC_DRENR_DME BIT(15)
	75	#define RPC_DRENR_CDE BIT(14)
	76	#define RPC_DRENR_OCDE BIT(12)
	77	#define RPC_DRENR_ADE(v) (((v) & 0xF) << 8)
	78	#define RPC_DRENR_OPDE(v) (((v) & 0xF) << 4)
	79
	80	#define RPC_SMCR 0x0020 /* R/W */
	81	#define RPC_SMCR_SSLKP BIT(8)
82	#define RPC_SMCR_SPIRE BIT(2)
83	#define RPC_SMCR_SPIWE BIT(1)
84	#define RPC_SMCR_SPIE BIT(0)
85
86	#define RPC_SMCMR 0x0024 /* R/W */
87	#define RPC_SMCMR_CMD(c) (((c) & 0xFF) << 16)
88	#define RPC_SMCMR_OCMD(c) (((c) & 0xFF) << 0)
89
90	#define RPC_SMADR 0x0028 /* R/W */
91	#define RPC_SMOPR 0x002C /* R/W */
92	#define RPC_SMOPR_OPD0(o) (((o) & 0xFF) << 0)
93	#define RPC_SMOPR_OPD1(o) (((o) & 0xFF) << 8)
94	#define RPC_SMOPR_OPD2(o) (((o) & 0xFF) << 16)
95	#define RPC_SMOPR_OPD3(o) (((o) & 0xFF) << 24)
96
97	#define RPC_SMENR 0x0030 /* R/W */
98	#define RPC_SMENR_CDB(o) (((o) & 0x3) << 30)
99	#define RPC_SMENR_OCDB(o) (((o) & 0x3) << 28)
100	#define RPC_SMENR_ADB(o) (((o) & 0x3) << 24)
101	#define RPC_SMENR_OPDB(o) (((o) & 0x3) << 20)
102	#define RPC_SMENR_SPIDB(o) (((o) & 0x3) << 16)
103	#define RPC_SMENR_DME BIT(15)
104	#define RPC_SMENR_CDE BIT(14)
105	#define RPC_SMENR_OCDE BIT(12)
106	#define RPC_SMENR_ADE(v) (((v) & 0xF) << 8)
107	#define RPC_SMENR_OPDE(v) (((v) & 0xF) << 4)
108	#define RPC_SMENR_SPIDE(v) (((v) & 0xF) << 0)
109
110	#define RPC_SMRDR0 0x0038 /* R */
111	#define RPC_SMRDR1 0x003C /* R */
112	#define RPC_SMWDR0 0x0040 /* R/W */
113	#define RPC_SMWDR1 0x0044 /* R/W */
114	#define RPC_CMNSR 0x0048 /* R */
115	#define RPC_CMNSR_SSLF BIT(1)
116	#define RPC_CMNSR_TEND BIT(0)
117
118	#define RPC_DRDMCR 0x0058 /* R/W */
119	#define RPC_DRDMCR_DMCYC(v) (((v) & 0xF) << 0)
120
121	#define RPC_DRDRENR 0x005C /* R/W */
122	#define RPC_DRDRENR_HYPE (0x5 << 12)
123	#define RPC_DRDRENR_ADDRE BIT(8)
124	#define RPC_DRDRENR_OPDRE BIT(4)
125	#define RPC_DRDRENR_DRDRE BIT(0)
126
127	#define RPC_SMDMCR 0x0060 /* R/W */
128	#define RPC_SMDMCR_DMCYC(v) (((v) & 0xF) << 0)
129
130	#define RPC_SMDRENR 0x0064 /* R/W */
131	#define RPC_SMDRENR_HYPE (0x5 << 12)
132	#define RPC_SMDRENR_ADDRE BIT(8)
133	#define RPC_SMDRENR_OPDRE BIT(4)
134	#define RPC_SMDRENR_SPIDRE BIT(0)
135
136	#define RPC_PHYCNT 0x007C /* R/W */
137	#define RPC_PHYCNT_CAL BIT(31)
138	#define PRC_PHYCNT_OCTA_AA BIT(22)
139	#define PRC_PHYCNT_OCTA_SA BIT(23)
140	#define PRC_PHYCNT_EXDS BIT(21)
141	#define RPC_PHYCNT_OCT BIT(20)
142	#define RPC_PHYCNT_STRTIM(v) (((v) & 0x7) << 15)
143	#define RPC_PHYCNT_WBUF2 BIT(4)
144	#define RPC_PHYCNT_WBUF BIT(2)
145	#define RPC_PHYCNT_MEM(v) (((v) & 0x3) << 0)
146
147	#define RPC_PHYINT 0x0088 /* R/W */
148	#define RPC_PHYINT_RSTEN BIT(18)
149	#define RPC_PHYINT_WPEN BIT(17)
150	#define RPC_PHYINT_INTEN BIT(16)
151	#define RPC_PHYINT_RST BIT(2)
152	#define RPC_PHYINT_WP BIT(1)
153	#define RPC_PHYINT_INT BIT(0)
154
155	#define RPC_WBUF 0x8000 /* R/W size=4/8/16/32/64Bytes */
156	#define RPC_WBUF_SIZE 0x100
157
158	DECLARE_GLOBAL_DATA_PTR;
159
8a8d24bd	160	struct rpc_spi_plat {
fbebea27 MV	161	fdt_addr_t regs;
	162	fdt_addr_t extr;
	163	s32 freq; /* Default clock freq, -1 for none */
	164	};
	165
	166	struct rpc_spi_priv {
	167	fdt_addr_t regs;
	168	fdt_addr_t extr;
	169	struct clk clk;
	170
	171	u8 cmdcopy[8];
	172	u32 cmdlen;
	173	bool cmdstarted;
	174	};
	175
	176	static int rpc_spi_wait_sslf(struct udevice *dev)
	177	{
	178	struct rpc_spi_priv *priv = dev_get_priv(dev->parent);
	179
	180	return wait_for_bit_le32((void *)priv->regs + RPC_CMNSR, RPC_CMNSR_SSLF,
	181	false, 1000, false);
	182	}
	183
	184	static int rpc_spi_wait_tend(struct udevice *dev)
	185	{
	186	struct rpc_spi_priv *priv = dev_get_priv(dev->parent);
	187
	188	return wait_for_bit_le32((void *)priv->regs + RPC_CMNSR, RPC_CMNSR_TEND,
	189	true, 1000, false);
	190	}
	191
	192	static void rpc_spi_flush_read_cache(struct udevice *dev)
	193	{
	194	struct udevice *bus = dev->parent;
	195	struct rpc_spi_priv *priv = dev_get_priv(bus);
	196
	197	/* Flush read cache */
	198	writel(RPC_DRCR_SSLN \| RPC_DRCR_RBURST(0x1f) \|
	199	RPC_DRCR_RCF \| RPC_DRCR_RBE \| RPC_DRCR_SSLE,
	200	priv->regs + RPC_DRCR);
	201	readl(priv->regs + RPC_DRCR);
	202
	203	}
	204
	205	static int rpc_spi_claim_bus(struct udevice *dev, bool manual)
	206	{
	207	struct udevice *bus = dev->parent;
	208	struct rpc_spi_priv *priv = dev_get_priv(bus);
	209
	210	/*
	211	* NOTE: The 0x260 are undocumented bits, but they must be set.
	212	* NOTE: On H3 ES1.x (not supported in mainline U-Boot), the
	213	* RPC_PHYCNT_STRTIM shall be 0, while on newer parts, the
	214	* RPC_PHYCNT_STRTIM shall be 6.
	215	*/
	216	writel(RPC_PHYCNT_CAL \| RPC_PHYCNT_STRTIM(6) \| 0x260,
	217	priv->regs + RPC_PHYCNT);
	218	writel((manual ? RPC_CMNCR_MD : 0) \| RPC_CMNCR_SFDE \|
	219	RPC_CMNCR_MOIIO_HIZ \| RPC_CMNCR_IOFV_HIZ \| RPC_CMNCR_BSZ(0),
	220	priv->regs + RPC_CMNCR);
	221
	222	writel(RPC_SSLDR_SPNDL(7) \| RPC_SSLDR_SLNDL(7) \|
	223	RPC_SSLDR_SCKDL(7), priv->regs + RPC_SSLDR);
	224
225	rpc_spi_flush_read_cache(dev);
226
227	return 0;
228	}
229
230	static int rpc_spi_release_bus(struct udevice *dev)
231	{
232	struct udevice *bus = dev->parent;
233	struct rpc_spi_priv *priv = dev_get_priv(bus);
234
235	/* NOTE: The 0x260 are undocumented bits, but they must be set. */
236	writel(RPC_PHYCNT_STRTIM(6) \| 0x260, priv->regs + RPC_PHYCNT);
237
238	rpc_spi_flush_read_cache(dev);
239
240	return 0;
241	}
242
243	static int rpc_spi_xfer(struct udevice *dev, unsigned int bitlen,
244	const void dout, void din, unsigned long flags)
245	{
246	struct udevice *bus = dev->parent;
247	struct rpc_spi_priv *priv = dev_get_priv(bus);
248	u32 wlen = dout ? (bitlen / 8) : 0;
249	u32 rlen = din ? (bitlen / 8) : 0;
250	u32 wloop = DIV_ROUND_UP(wlen, 4);
251	u32 smenr, smcr, offset;
252	int ret = 0;
253
254	if (!priv->cmdstarted) {
255	if (!wlen \|\| rlen)
256	BUG();
257
258	memcpy(priv->cmdcopy, dout, wlen);
259	priv->cmdlen = wlen;
260
261	/* Command transfer start */
262	priv->cmdstarted = true;
263	if (!(flags & SPI_XFER_END))
264	return 0;
265	}
266
267	offset = (priv->cmdcopy[1] << 16) \| (priv->cmdcopy[2] << 8) \|
268	(priv->cmdcopy[3] << 0);
269
270	smenr = 0;
271
272	if (wlen \|\| (!rlen && !wlen) \|\| flags == SPI_XFER_ONCE) {
273	if (wlen && flags == SPI_XFER_END)
274	smenr = RPC_SMENR_SPIDE(0xf);
275
276	rpc_spi_claim_bus(dev, true);
277
278	writel(0, priv->regs + RPC_SMCR);
279
280	if (priv->cmdlen >= 1) { /* Command(1) */
281	writel(RPC_SMCMR_CMD(priv->cmdcopy[0]),
282	priv->regs + RPC_SMCMR);
283	smenr \|= RPC_SMENR_CDE;
284	} else {
285	writel(0, priv->regs + RPC_SMCMR);
286	}
287
288	if (priv->cmdlen >= 4) { /* Address(3) */
289	writel(offset, priv->regs + RPC_SMADR);
290	smenr \|= RPC_SMENR_ADE(7);
291	} else {
292	writel(0, priv->regs + RPC_SMADR);
293	}
294
295	if (priv->cmdlen >= 5) { /* Dummy(n) */
296	writel(8 * (priv->cmdlen - 4) - 1,
297	priv->regs + RPC_SMDMCR);
298	smenr \|= RPC_SMENR_DME;
299	} else {
300	writel(0, priv->regs + RPC_SMDMCR);
301	}
302
303	writel(0, priv->regs + RPC_SMOPR);
304
305	writel(0, priv->regs + RPC_SMDRENR);
306
307	if (wlen && flags == SPI_XFER_END) {
308	u32 datout = (u32 )dout;
309
310	while (wloop--) {
311	smcr = RPC_SMCR_SPIWE \| RPC_SMCR_SPIE;
312	if (wloop >= 1)
313	smcr \|= RPC_SMCR_SSLKP;
314	writel(smenr, priv->regs + RPC_SMENR);
315	writel(*datout, priv->regs + RPC_SMWDR0);
316	writel(smcr, priv->regs + RPC_SMCR);
317	ret = rpc_spi_wait_tend(dev);
318	if (ret)
319	goto err;
320	datout++;
321	smenr = RPC_SMENR_SPIDE(0xf);
322	}
323
324	ret = rpc_spi_wait_sslf(dev);
325
326	} else {
327	writel(smenr, priv->regs + RPC_SMENR);
328	writel(RPC_SMCR_SPIE, priv->regs + RPC_SMCR);
329	ret = rpc_spi_wait_tend(dev);
330	}
331	} else { /* Read data only, using DRx ext access */
332	rpc_spi_claim_bus(dev, false);
333
334	if (priv->cmdlen >= 1) { /* Command(1) */
335	writel(RPC_DRCMR_CMD(priv->cmdcopy[0]),
336	priv->regs + RPC_DRCMR);
337	smenr \|= RPC_DRENR_CDE;
338	} else {
339	writel(0, priv->regs + RPC_DRCMR);
340	}
341
342	if (priv->cmdlen >= 4) /* Address(3) */
343	smenr \|= RPC_DRENR_ADE(7);
344
345	if (priv->cmdlen >= 5) { /* Dummy(n) */
346	writel(8 * (priv->cmdlen - 4) - 1,
347	priv->regs + RPC_DRDMCR);
348	smenr \|= RPC_DRENR_DME;
349	} else {
350	writel(0, priv->regs + RPC_DRDMCR);
351	}
352
353	writel(0, priv->regs + RPC_DROPR);
354
355	writel(smenr, priv->regs + RPC_DRENR);
356
357	if (rlen)
358	memcpy_fromio(din, (void *)(priv->extr + offset), rlen);
359	else
360	readl(priv->extr); /* Dummy read */
361	}
362
363	err:
364	priv->cmdstarted = false;
365
366	rpc_spi_release_bus(dev);
367
368	return ret;
369	}
370
371	static int rpc_spi_set_speed(struct udevice *bus, uint speed)
372	{
373	/* This is a SPI NOR controller, do nothing. */
374	return 0;
375	}
376
377	static int rpc_spi_set_mode(struct udevice *bus, uint mode)
378	{
379	/* This is a SPI NOR controller, do nothing. */
380	return 0;
381	}
382
383	static int rpc_spi_bind(struct udevice *parent)
384	{
385	const void *fdt = gd->fdt_blob;
386	ofnode node;
387	int ret, off;
388
389	/*
390	* Check if there are any SPI NOR child nodes, if so, bind as
391	* this controller will be operated in SPI mode.
392	*/
393	dev_for_each_subnode(node, parent) {
394	off = ofnode_to_offset(node);
395
396	ret = fdt_node_check_compatible(fdt, off, "spi-flash");
397	if (!ret)
398	return 0;
399
400	ret = fdt_node_check_compatible(fdt, off, "jedec,spi-nor");
401	if (!ret)
402	return 0;
403	}
404
405	return -ENODEV;
406	}
407
408	static int rpc_spi_probe(struct udevice *dev)
409	{
8a8d24bd	410	struct rpc_spi_plat *plat = dev_get_plat(dev);
fbebea27 MV	411	struct rpc_spi_priv *priv = dev_get_priv(dev);
	412
	413	priv->regs = plat->regs;
	414	priv->extr = plat->extr;
b5b66567	415	#if CONFIG_IS_ENABLED(CLK)
fbebea27	416	clk_enable(&priv->clk);
b5b66567	417	#endif
fbebea27 MV	418	return 0;
	419	}
	420
d1998a9f	421	static int rpc_spi_of_to_plat(struct udevice *bus)
fbebea27	422	{
8a8d24bd	423	struct rpc_spi_plat *plat = dev_get_plat(bus);
fbebea27 MV	424
	425	plat->regs = dev_read_addr_index(bus, 0);
	426	plat->extr = dev_read_addr_index(bus, 1);
	427
b5b66567 MV	428	#if CONFIG_IS_ENABLED(CLK)
	429	struct rpc_spi_priv *priv = dev_get_priv(bus);
	430	int ret;
	431
fbebea27 MV	432	ret = clk_get_by_index(bus, 0, &priv->clk);
	433	if (ret < 0) {
	434	printf("%s: Could not get clock for %s: %d\n",
	435	__func__, bus->name, ret);
	436	return ret;
	437	}
b5b66567	438	#endif
fbebea27 MV	439
	440	plat->freq = dev_read_u32_default(bus, "spi-max-freq", 50000000);
	441
	442	return 0;
	443	}
	444
	445	static const struct dm_spi_ops rpc_spi_ops = {
	446	.xfer = rpc_spi_xfer,
	447	.set_speed = rpc_spi_set_speed,
	448	.set_mode = rpc_spi_set_mode,
	449	};
	450
	451	static const struct udevice_id rpc_spi_ids[] = {
2f220c63	452	{ .compatible = "renesas,rpc-r7s72100" },
fbebea27 MV	453	{ .compatible = "renesas,rpc-r8a7795" },
	454	{ .compatible = "renesas,rpc-r8a7796" },
	455	{ .compatible = "renesas,rpc-r8a77965" },
	456	{ .compatible = "renesas,rpc-r8a77970" },
	457	{ .compatible = "renesas,rpc-r8a77995" },
2f220c63	458	{ .compatible = "renesas,rcar-gen3-rpc" },
fbebea27 MV	459	{ }
	460	};
	461
	462	U_BOOT_DRIVER(rpc_spi) = {
	463	.name = "rpc_spi",
	464	.id = UCLASS_SPI,
	465	.of_match = rpc_spi_ids,
	466	.ops = &rpc_spi_ops,
d1998a9f	467	.of_to_plat = rpc_spi_of_to_plat,
8a8d24bd	468	.plat_auto = sizeof(struct rpc_spi_plat),
41575d8e	469	.priv_auto = sizeof(struct rpc_spi_priv),
fbebea27 MV	470	.bind = rpc_spi_bind,
	471	.probe = rpc_spi_probe,
	472	};