--- /dev/null
+/*
+ * Renesas RCar Gen3 RPC QSPI driver
+ *
+ * Copyright (C) 2018 Marek Vasut <marek.vasut@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.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/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_platdata {
+ 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_platdata *plat = dev_get_platdata(dev);
+ struct rpc_spi_priv *priv = dev_get_priv(dev);
+
+ priv->regs = plat->regs;
+ priv->extr = plat->extr;
+
+ clk_enable(&priv->clk);
+
+ return 0;
+}
+
+static int rpc_spi_ofdata_to_platdata(struct udevice *bus)
+{
+ struct rpc_spi_platdata *plat = dev_get_platdata(bus);
+ struct rpc_spi_priv *priv = dev_get_priv(bus);
+ int ret;
+
+ plat->regs = dev_read_addr_index(bus, 0);
+ plat->extr = dev_read_addr_index(bus, 1);
+
+ 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;
+ }
+
+ 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-r8a7795" },
+ { .compatible = "renesas,rpc-r8a7796" },
+ { .compatible = "renesas,rpc-r8a77965" },
+ { .compatible = "renesas,rpc-r8a77970" },
+ { .compatible = "renesas,rpc-r8a77995" },
+ { }
+};
+
+U_BOOT_DRIVER(rpc_spi) = {
+ .name = "rpc_spi",
+ .id = UCLASS_SPI,
+ .of_match = rpc_spi_ids,
+ .ops = &rpc_spi_ops,
+ .ofdata_to_platdata = rpc_spi_ofdata_to_platdata,
+ .platdata_auto_alloc_size = sizeof(struct rpc_spi_platdata),
+ .priv_auto_alloc_size = sizeof(struct rpc_spi_priv),
+ .bind = rpc_spi_bind,
+ .probe = rpc_spi_probe,
+};
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