Add driver for the RPC block in SPI-flash mode. This driver allows access to a SPI NOR flash attached to the RPC block and does not support RPC in Hyperflash mode. Note that this block is extremely selective when communicating with the SPI NOR.
Signed-off-by: Marek Vasut marek.vasut+renesas@gmail.com Cc: Nobuhiro Iwamatsu iwamatsu@nigauri.org --- drivers/spi/Kconfig | 8 + drivers/spi/Makefile | 1 + drivers/spi/renesas_rpc_spi.c | 465 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 474 insertions(+) create mode 100644 drivers/spi/renesas_rpc_spi.c
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index d3e407ec11..ec92b84ed2 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -114,6 +114,14 @@ config PIC32_SPI to access the SPI NOR flash, MMC-over-SPI on platforms based on Microchip PIC32 family devices.
+config RENESAS_RPC_SPI + bool "Renesas RPC SPI driver" + depends on RCAR_GEN3 + help + Enable the Renesas RPC SPI driver, used to access SPI NOR flash + on Renesas RCar Gen3 SoCs. This uses driver model and requires a + device tree binding to operate. + config ROCKCHIP_SPI bool "Rockchip SPI driver" help diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 4b6000fd9a..176bfa05cf 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -39,6 +39,7 @@ obj-$(CONFIG_MXS_SPI) += mxs_spi.o obj-$(CONFIG_ATCSPI200_SPI) += atcspi200_spi.o obj-$(CONFIG_OMAP3_SPI) += omap3_spi.o obj-$(CONFIG_PIC32_SPI) += pic32_spi.o +obj-$(CONFIG_RENESAS_RPC_SPI) += renesas_rpc_spi.o obj-$(CONFIG_ROCKCHIP_SPI) += rk_spi.o obj-$(CONFIG_SANDBOX_SPI) += sandbox_spi.o obj-$(CONFIG_SH_SPI) += sh_spi.o diff --git a/drivers/spi/renesas_rpc_spi.c b/drivers/spi/renesas_rpc_spi.c new file mode 100644 index 0000000000..e54f24c5d8 --- /dev/null +++ b/drivers/spi/renesas_rpc_spi.c @@ -0,0 +1,465 @@ +/* + * 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, +};