Add Nuvoton NPCM BMC Flash Interface Unit(FIU) SPI master controller driver using SPI-MEM interface.
The FIU supports single, dual or quad communication interface. The FIU controller driver provides flash access in UMA(User Mode Access) mode by using an indirect address/data mechanism.
the dts node is followed upstream kernel dts name.
Signed-off-by: Jim Liu JJLIU0@nuvoton.com Signed-off-by: Stanley Chu yschu@nuvoton.com --- drivers/spi/Kconfig | 6 + drivers/spi/Makefile | 1 + drivers/spi/npcm_fiu_spi.c | 387 +++++++++++++++++++++++++++++++++++++ 3 files changed, 394 insertions(+) create mode 100644 drivers/spi/npcm_fiu_spi.c
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 8dba95ae4e..52bd6983ab 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -290,6 +290,12 @@ config NXP_FSPI Enable the NXP FlexSPI (FSPI) driver. This driver can be used to access the SPI NOR flash on platforms embedding this NXP IP core.
+config NPCM_FIU_SPI + bool "FIU driver for Nuvoton NPCM SoC" + help + This enables support for the Flash Interface Unit SPI controller + in master mode. + config OCTEON_SPI bool "Octeon SPI driver" depends on ARCH_OCTEON || ARCH_OCTEONTX || ARCH_OCTEONTX2 diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 7f43f843ca..1f68dd9b29 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -48,6 +48,7 @@ obj-$(CONFIG_MVEBU_A3700_SPI) += mvebu_a3700_spi.o obj-$(CONFIG_MXC_SPI) += mxc_spi.o obj-$(CONFIG_MXS_SPI) += mxs_spi.o obj-$(CONFIG_NXP_FSPI) += nxp_fspi.o +obj-$(CONFIG_NPCM_FIU_SPI) += npcm_fiu_spi.o obj-$(CONFIG_ATCSPI200_SPI) += atcspi200_spi.o obj-$(CONFIG_OCTEON_SPI) += octeon_spi.o obj-$(CONFIG_OMAP3_SPI) += omap3_spi.o diff --git a/drivers/spi/npcm_fiu_spi.c b/drivers/spi/npcm_fiu_spi.c new file mode 100644 index 0000000000..7000fe5860 --- /dev/null +++ b/drivers/spi/npcm_fiu_spi.c @@ -0,0 +1,387 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2022 Nuvoton Technology Corp. + * NPCM Flash Interface Unit(FIU) SPI master controller driver. + */ + +#include <clk.h> +#include <dm.h> +#include <spi.h> +#include <spi-mem.h> +#include <linux/bitfield.h> +#include <linux/log2.h> +#include <linux/iopoll.h> + +#define DW_SIZE 4 +#define CHUNK_SIZE 16 +#define XFER_TIMEOUT 1000000 + +/* FIU UMA Configuration Register (UMA_CFG) */ +#define UMA_CFG_RDATSIZ_MASK GENMASK(28, 24) +#define UMA_CFG_DBSIZ_MASK GENMASK(23, 21) +#define UMA_CFG_WDATSIZ_MASK GENMASK(20, 16) +#define UMA_CFG_ADDSIZ_MASK GENMASK(13, 11) +#define UMA_CFG_RDBPCK_MASK GENMASK(9, 8) +#define UMA_CFG_DBPCK_MASK GENMASK(7, 6) +#define UMA_CFG_WDBPCK_MASK GENMASK(5, 4) +#define UMA_CFG_ADBPCK_MASK GENMASK(3, 2) +#define UMA_CFG_CMBPCK_MASK GENMASK(1, 0) +#define UMA_CFG_CMDSIZ_SHIFT 10 + +/* FIU UMA Control and Status Register (UMA_CTS) */ +#define UMA_CTS_SW_CS BIT(16) +#define UMA_CTS_EXEC_DONE BIT(0) +#define UMA_CTS_RDYST BIT(24) +#define UMA_CTS_DEV_NUM_MASK GENMASK(9, 8) + +struct npcm_fiu_regs { + unsigned int drd_cfg; + unsigned int dwr_cfg; + unsigned int uma_cfg; + unsigned int uma_cts; + unsigned int uma_cmd; + unsigned int uma_addr; + unsigned int prt_cfg; + unsigned char res1[4]; + unsigned int uma_dw0; + unsigned int uma_dw1; + unsigned int uma_dw2; + unsigned int uma_dw3; + unsigned int uma_dr0; + unsigned int uma_dr1; + unsigned int uma_dr2; + unsigned int uma_dr3; + unsigned int prt_cmd0; + unsigned int prt_cmd1; + unsigned int prt_cmd2; + unsigned int prt_cmd3; + unsigned int prt_cmd4; + unsigned int prt_cmd5; + unsigned int prt_cmd6; + unsigned int prt_cmd7; + unsigned int prt_cmd8; + unsigned int prt_cmd9; + unsigned int stuff[4]; + unsigned int fiu_cfg; +}; + +struct npcm_fiu_priv { + struct npcm_fiu_regs *regs; + struct clk clk; +}; + +static int npcm_fiu_spi_set_speed(struct udevice *bus, uint speed) +{ + struct npcm_fiu_priv *priv = dev_get_priv(bus); + int ret; + + debug("%s: set speed %u\n", bus->name, speed); + ret = clk_set_rate(&priv->clk, speed); + if (ret < 0) + return ret; + + return 0; +} + +static int npcm_fiu_spi_set_mode(struct udevice *bus, uint mode) +{ + return 0; +} + +static inline void activate_cs(struct npcm_fiu_regs *regs, int cs) +{ + writel(FIELD_PREP(UMA_CTS_DEV_NUM_MASK, cs), ®s->uma_cts); +} + +static inline void deactivate_cs(struct npcm_fiu_regs *regs, int cs) +{ + writel(FIELD_PREP(UMA_CTS_DEV_NUM_MASK, cs) | UMA_CTS_SW_CS, ®s->uma_cts); +} + +static int fiu_uma_read(struct udevice *bus, u8 *buf, u32 size) +{ + struct npcm_fiu_priv *priv = dev_get_priv(bus); + struct npcm_fiu_regs *regs = priv->regs; + u32 data_reg[4]; + u32 val; + int ret; + + /* Set data size */ + writel(FIELD_PREP(UMA_CFG_RDATSIZ_MASK, size), ®s->uma_cfg); + + /* Initiate the read */ + writel(readl(®s->uma_cts) | UMA_CTS_EXEC_DONE, ®s->uma_cts); + + /* Wait for completion */ + ret = readl_poll_timeout(®s->uma_cts, val, + !(val & UMA_CTS_EXEC_DONE), XFER_TIMEOUT); + if (ret) { + printf("npcm_fiu: read timeout\n"); + return ret; + } + + /* Copy data from data registers */ + if (size) + data_reg[0] = readl(®s->uma_dr0); + if (size > DW_SIZE) + data_reg[1] = readl(®s->uma_dr1); + if (size > DW_SIZE * 2) + data_reg[2] = readl(®s->uma_dr2); + if (size > DW_SIZE * 3) + data_reg[3] = readl(®s->uma_dr3); + memcpy(buf, data_reg, size); + + return 0; +} + +static int fiu_uma_write(struct udevice *bus, const u8 *buf, u32 size) +{ + struct npcm_fiu_priv *priv = dev_get_priv(bus); + struct npcm_fiu_regs *regs = priv->regs; + u32 data_reg[4]; + u32 val; + int ret; + + /* Set data size */ + writel(FIELD_PREP(UMA_CFG_WDATSIZ_MASK, size), ®s->uma_cfg); + + /* Write data to data registers */ + memcpy(data_reg, buf, size); + if (size) + writel(data_reg[0], ®s->uma_dw0); + if (size > DW_SIZE) + writel(data_reg[1], ®s->uma_dw1); + if (size > DW_SIZE * 2) + writel(data_reg[2], ®s->uma_dw2); + if (size > DW_SIZE * 3) + writel(data_reg[3], ®s->uma_dw3); + + /* Initiate the transaction */ + writel(readl(®s->uma_cts) | UMA_CTS_EXEC_DONE, ®s->uma_cts); + + /* Wait for completion */ + ret = readl_poll_timeout(®s->uma_cts, val, + !(val & UMA_CTS_EXEC_DONE), XFER_TIMEOUT); + if (ret) + printf("npcm_fiu: write timeout\n"); + + return ret; +} + +static int npcm_fiu_spi_xfer(struct udevice *dev, unsigned int bitlen, + const void *dout, void *din, unsigned long flags) +{ + struct udevice *bus = dev->parent; + struct npcm_fiu_priv *priv = dev_get_priv(bus); + struct npcm_fiu_regs *regs = priv->regs; + struct dm_spi_slave_plat *slave_plat = + dev_get_parent_plat(dev); + const u8 *tx = dout; + u8 *rx = din; + int bytes = bitlen / 8; + int ret = 0; + int len; + + if (flags & SPI_XFER_BEGIN) + activate_cs(regs, slave_plat->cs); + + while (bytes) { + len = (bytes > CHUNK_SIZE) ? CHUNK_SIZE : bytes; + if (tx) { + ret = fiu_uma_write(bus, tx, len); + if (ret) + break; + tx += len; + } else { + ret = fiu_uma_read(bus, rx, len); + if (ret) + break; + rx += len; + } + bytes -= len; + } + + if (flags & SPI_XFER_END) + deactivate_cs(regs, slave_plat->cs); + + return ret; +} + +static int npcm_fiu_uma_operation(struct npcm_fiu_priv *priv, const struct spi_mem_op *op, + u32 addr, const u8 *tx, u8 *rx, u32 nbytes, bool started) +{ + struct npcm_fiu_regs *regs = priv->regs; + u32 uma_cfg = 0, val; + u32 data_reg[4]; + int ret; + + debug("fiu_uma: opcode 0x%x, dir %d, addr 0x%x, %d bytes\n", + op->cmd.opcode, op->data.dir, addr, nbytes); + debug(" buswidth cmd:%d, addr:%d, dummy:%d, data:%d\n", + op->cmd.buswidth, op->addr.buswidth, op->dummy.buswidth, + op->data.buswidth); + debug(" size cmd:%d, addr:%d, dummy:%d, data:%d\n", + 1, op->addr.nbytes, op->dummy.nbytes, op->data.nbytes); + debug(" tx %p, rx %p\n", tx, rx); + + if (!started) { + /* Send cmd/addr in the begin of an transaction */ + writel(op->cmd.opcode, ®s->uma_cmd); + + uma_cfg |= FIELD_PREP(UMA_CFG_CMBPCK_MASK, ilog2(op->cmd.buswidth)) | + (1 << UMA_CFG_CMDSIZ_SHIFT); + /* Configure addr bytes */ + if (op->addr.nbytes) { + uma_cfg |= FIELD_PREP(UMA_CFG_ADBPCK_MASK, ilog2(op->addr.buswidth)) | + FIELD_PREP(UMA_CFG_ADDSIZ_MASK, op->addr.nbytes); + writel(addr, ®s->uma_addr); + } + /* Configure dummy bytes */ + if (op->dummy.nbytes) + uma_cfg |= FIELD_PREP(UMA_CFG_DBPCK_MASK, ilog2(op->dummy.buswidth)) | + FIELD_PREP(UMA_CFG_DBSIZ_MASK, op->dummy.nbytes); + } + /* Set data bus width and data size */ + if (op->data.dir == SPI_MEM_DATA_IN && nbytes) + uma_cfg |= FIELD_PREP(UMA_CFG_RDBPCK_MASK, ilog2(op->data.buswidth)) | + FIELD_PREP(UMA_CFG_RDATSIZ_MASK, nbytes); + else if (op->data.dir == SPI_MEM_DATA_OUT && nbytes) + uma_cfg |= FIELD_PREP(UMA_CFG_WDBPCK_MASK, ilog2(op->data.buswidth)) | + FIELD_PREP(UMA_CFG_WDATSIZ_MASK, nbytes); + writel(uma_cfg, ®s->uma_cfg); + + if (op->data.dir == SPI_MEM_DATA_OUT && nbytes) { + memcpy(data_reg, tx, nbytes); + + if (nbytes) + writel(data_reg[0], ®s->uma_dw0); + if (nbytes > DW_SIZE) + writel(data_reg[1], ®s->uma_dw1); + if (nbytes > DW_SIZE * 2) + writel(data_reg[2], ®s->uma_dw2); + if (nbytes > DW_SIZE * 3) + writel(data_reg[3], ®s->uma_dw3); + } + /* Initiate the transaction */ + writel(readl(®s->uma_cts) | UMA_CTS_EXEC_DONE, ®s->uma_cts); + + /* Wait for completion */ + ret = readl_poll_timeout(®s->uma_cts, val, + !(val & UMA_CTS_EXEC_DONE), XFER_TIMEOUT); + if (ret) { + printf("npcm_fiu: UMA op timeout\n"); + return ret; + } + + if (op->data.dir == SPI_MEM_DATA_IN && nbytes) { + if (nbytes) + data_reg[0] = readl(®s->uma_dr0); + if (nbytes > DW_SIZE) + data_reg[1] = readl(®s->uma_dr1); + if (nbytes > DW_SIZE * 2) + data_reg[2] = readl(®s->uma_dr2); + if (nbytes > DW_SIZE * 3) + data_reg[3] = readl(®s->uma_dr3); + + memcpy(rx, data_reg, nbytes); + } + + return 0; +} + +static int npcm_fiu_exec_op(struct spi_slave *slave, + const struct spi_mem_op *op) +{ + struct udevice *bus = slave->dev->parent; + struct npcm_fiu_priv *priv = dev_get_priv(bus); + struct npcm_fiu_regs *regs = priv->regs; + struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(slave->dev); + u32 bytes, len, addr; + const u8 *tx; + u8 *rx; + bool started = false; + int ret; + + bytes = op->data.nbytes; + addr = (u32)op->addr.val; + if (!bytes) { + activate_cs(regs, slave_plat->cs); + ret = npcm_fiu_uma_operation(priv, op, addr, NULL, NULL, 0, false); + deactivate_cs(regs, slave_plat->cs); + return ret; + } + + tx = op->data.buf.out; + rx = op->data.buf.in; + /* + * Use SW-control CS for write to extend the transaction and + * keep the Write Enable state. + * Use HW-control CS for read to avoid clock and timing issues. + */ + if (op->data.dir == SPI_MEM_DATA_OUT) + activate_cs(regs, slave_plat->cs); + else + writel(FIELD_PREP(UMA_CTS_DEV_NUM_MASK, slave_plat->cs) | UMA_CTS_SW_CS, + ®s->uma_cts); + while (bytes) { + len = (bytes > CHUNK_SIZE) ? CHUNK_SIZE : bytes; + ret = npcm_fiu_uma_operation(priv, op, addr, tx, rx, len, started); + if (ret) + return ret; + + /* CS is kept low for uma write, extend the transaction */ + if (op->data.dir == SPI_MEM_DATA_OUT) + started = true; + + bytes -= len; + addr += len; + if (tx) + tx += len; + if (rx) + rx += len; + } + if (op->data.dir == SPI_MEM_DATA_OUT) + deactivate_cs(regs, slave_plat->cs); + + return 0; +} + +static int npcm_fiu_spi_probe(struct udevice *bus) +{ + struct npcm_fiu_priv *priv = dev_get_priv(bus); + int ret; + + priv->regs = (struct npcm_fiu_regs *)dev_read_addr_ptr(bus); + + ret = clk_get_by_index(bus, 0, &priv->clk); + if (ret < 0) + return ret; + + return 0; +} + +static const struct spi_controller_mem_ops npcm_fiu_mem_ops = { + .exec_op = npcm_fiu_exec_op, +}; + +static const struct dm_spi_ops npcm_fiu_spi_ops = { + .xfer = npcm_fiu_spi_xfer, + .set_speed = npcm_fiu_spi_set_speed, + .set_mode = npcm_fiu_spi_set_mode, + .mem_ops = &npcm_fiu_mem_ops, +}; + +static const struct udevice_id npcm_fiu_spi_ids[] = { + { .compatible = "nuvoton,npcm845-fiu" }, + { .compatible = "nuvoton,npcm750-fiu" }, + { } +}; + +U_BOOT_DRIVER(npcm_fiu_spi) = { + .name = "npcm_fiu_spi", + .id = UCLASS_SPI, + .of_match = npcm_fiu_spi_ids, + .ops = &npcm_fiu_spi_ops, + .priv_auto = sizeof(struct npcm_fiu_priv), + .probe = npcm_fiu_spi_probe, +};