* [PATCH 2/2] spi: Add Nuvoton MA35D1 QSPI controller support
2026-06-03 4:35 [PATCH 0/2] Add support for nuvoton ma35d1 qspi controller Chi-Wen Weng
2026-06-03 4:35 ` [PATCH 1/2] dt-bindings: spi: Add for Nuvoton MA35D1 SoC QSPI Controller Chi-Wen Weng
@ 2026-06-03 4:35 ` Chi-Wen Weng
1 sibling, 0 replies; 3+ messages in thread
From: Chi-Wen Weng @ 2026-06-03 4:35 UTC (permalink / raw)
To: broonie, robh, krzk+dt, conor+dt
Cc: linux-arm-kernel, linux-spi, devicetree, linux-kernel, cwweng,
Chi-Wen Weng
Signed-off-by: Chi-Wen Weng <cwweng.linux@gmail.com>
---
drivers/spi/Kconfig | 6 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-ma35d1-qspi.c | 579 ++++++++++++++++++++++++++++++++++
3 files changed, 586 insertions(+)
create mode 100644 drivers/spi/spi-ma35d1-qspi.c
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index b563f49e2197..1fde55abc36a 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -694,6 +694,12 @@ config SPI_LJCA
This driver can also be built as a module. If so, the module
will be called spi-ljca.
+config SPI_MA35D1_QSPI
+ tristate "Nuvoton MA35D1 QSPI Controller"
+ help
+ This driver provides support for Nuvoton MA35D1
+ QSPI controller in master mode.
+
config SPI_MESON_SPICC
tristate "Amlogic Meson SPICC controller"
depends on COMMON_CLK
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 9d36190a9884..ed1615bf5684 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -85,6 +85,7 @@ obj-$(CONFIG_SPI_LOONGSON_CORE) += spi-loongson-core.o
obj-$(CONFIG_SPI_LOONGSON_PCI) += spi-loongson-pci.o
obj-$(CONFIG_SPI_LOONGSON_PLATFORM) += spi-loongson-plat.o
obj-$(CONFIG_SPI_LP8841_RTC) += spi-lp8841-rtc.o
+obj-$(CONFIG_SPI_MA35D1_QSPI) += spi-ma35d1-qspi.o
obj-$(CONFIG_SPI_MESON_SPICC) += spi-meson-spicc.o
obj-$(CONFIG_SPI_MESON_SPIFC) += spi-meson-spifc.o
obj-$(CONFIG_SPI_MICROCHIP_CORE_QSPI) += spi-microchip-core-qspi.o
diff --git a/drivers/spi/spi-ma35d1-qspi.c b/drivers/spi/spi-ma35d1-qspi.c
new file mode 100644
index 000000000000..119c06464cb0
--- /dev/null
+++ b/drivers/spi/spi-ma35d1-qspi.c
@@ -0,0 +1,579 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Nuvoton MA35D1 QSPI controller driver
+ *
+ * Copyright (c) 2026 Nuvoton Technology Corp.
+ * Author: Chi-Wen Weng <cwweng@nuvoton.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi-mem.h>
+
+/* Register offset definitions */
+#define NUVOTON_QSPI_CTL_OFFSET 0x00 /* Control Register, RW */
+#define NUVOTON_QSPI_CLKDIV_OFFSET 0x04 /* Clock Divider Register, RW */
+#define NUVOTON_QSPI_SSCTL_OFFSET 0x08 /* Slave Select Register, RW */
+#define NUVOTON_QSPI_FIFOCTL_OFFSET 0x10 /* FIFO Control Register, RW */
+#define NUVOTON_QSPI_STATUS_OFFSET 0x14 /* Status Register, RW */
+#define NUVOTON_QSPI_TX_OFFSET 0x20 /* Data Transmit Register, WO */
+#define NUVOTON_QSPI_RX_OFFSET 0x30 /* Data Receive Register, RO */
+
+/* QSPI Control Register bit masks */
+#define NUVOTON_QSPI_CTL_QUADIOEN_MASK BIT(22) /* Quad I/O Mode Enable */
+#define NUVOTON_QSPI_CTL_DUALIOEN_MASK BIT(21) /* Dual I/O Mode Enable */
+#define NUVOTON_QSPI_CTL_DATDIR_MASK BIT(20) /* Data Port Direction Control */
+#define NUVOTON_QSPI_CTL_REORDER_MASK BIT(19) /* Byte Reorder Function Enable */
+#define NUVOTON_QSPI_CTL_LSB_MASK BIT(13) /* Send LSB First */
+#define NUVOTON_QSPI_CTL_DWIDTH_MASK GENMASK(12, 8) /* Data Width */
+#define NUVOTON_QSPI_CTL_SUSPITV_MASK GENMASK(7, 4) /* Suspend Interval */
+#define NUVOTON_QSPI_CTL_CLKPOL_MASK BIT(3) /* Clock Polarity */
+#define NUVOTON_QSPI_CTL_TXNEG_MASK BIT(2) /* Transmit on Negative Edge */
+#define NUVOTON_QSPI_CTL_RXNEG_MASK BIT(1) /* Receive on Negative Edge */
+#define NUVOTON_QSPI_CTL_SPIEN_MASK BIT(0) /* QSPI Transfer Control Enable */
+
+/* QSPI Clock Divider Register bit masks */
+#define NUVOTON_QSPI_CLKDIV_MASK GENMASK(8, 0) /* Clock Divider */
+
+/* QSPI Slave Select Control Register bit masks */
+#define NUVOTON_QSPI_SSCTL_SSACTPOL_MASK BIT(2) /* Slave Selection Active Polarity */
+#define NUVOTON_QSPI_SSCTL_SS1_MASK BIT(1) /* Slave Selection 1 Control */
+#define NUVOTON_QSPI_SSCTL_SS0_MASK BIT(0) /* Slave Selection 0 Control */
+
+/* QSPI FIFO Control Register bit masks */
+#define NUVOTON_QSPI_FIFOCTL_TXRST_MASK BIT(1) /* Transmit Reset */
+#define NUVOTON_QSPI_FIFOCTL_RXRST_MASK BIT(0) /* Receive Reset */
+
+/* QSPI Status Register bit masks */
+#define NUVOTON_QSPI_STATUS_TXRXRST_MASK BIT(23) /* TX or RX Reset Status */
+#define NUVOTON_QSPI_STATUS_TXFULL_MASK BIT(17) /* Transmit FIFO Full */
+#define NUVOTON_QSPI_STATUS_TXEMPTY_MASK BIT(16) /* Transmit FIFO Empty */
+#define NUVOTON_QSPI_STATUS_SPIENSTS_MASK BIT(15) /* QSPI Enable Status */
+#define NUVOTON_QSPI_STATUS_RXFULL_MASK BIT(9) /* Receive FIFO Full */
+#define NUVOTON_QSPI_STATUS_RXEMPTY_MASK BIT(8) /* Receive FIFO Empty */
+#define NUVOTON_QSPI_STATUS_UNITIF_MASK BIT(1) /* Unit Transfer Interrupt Flag */
+#define NUVOTON_QSPI_STATUS_BUSY_MASK BIT(0) /* Busy Status */
+
+#define NUVOTON_QSPI_DEFAULT_NUM_CS 2
+#define NUVOTON_QSPI_DEFAULT_BPW 8
+#define NUVOTON_QSPI_TIMEOUT_US 10000
+
+struct nuvoton_qspi {
+ void __iomem *regs;
+ struct clk *clk;
+ struct device *dev;
+ u32 speed_hz;
+ u8 bits_per_word;
+};
+
+static u32 nuvoton_qspi_read(struct nuvoton_qspi *qspi, u32 reg)
+{
+ return readl(qspi->regs + reg);
+}
+
+static void nuvoton_qspi_write(struct nuvoton_qspi *qspi, u32 val, u32 reg)
+{
+ writel(val, qspi->regs + reg);
+}
+
+static void nuvoton_qspi_update_bits(struct nuvoton_qspi *qspi, u32 reg,
+ u32 mask, u32 val)
+{
+ u32 tmp;
+
+ tmp = nuvoton_qspi_read(qspi, reg);
+ tmp &= ~mask;
+ tmp |= val & mask;
+ nuvoton_qspi_write(qspi, tmp, reg);
+}
+
+static int nuvoton_qspi_wait_ready(struct nuvoton_qspi *qspi)
+{
+ u32 val;
+
+ return readl_poll_timeout(qspi->regs + NUVOTON_QSPI_STATUS_OFFSET,
+ val,
+ !(val & NUVOTON_QSPI_STATUS_BUSY_MASK),
+ 0, NUVOTON_QSPI_TIMEOUT_US);
+}
+
+static int nuvoton_qspi_reset_fifo(struct nuvoton_qspi *qspi)
+{
+ u32 val;
+
+ val = nuvoton_qspi_read(qspi, NUVOTON_QSPI_FIFOCTL_OFFSET);
+ val |= NUVOTON_QSPI_FIFOCTL_TXRST_MASK |
+ NUVOTON_QSPI_FIFOCTL_RXRST_MASK;
+ nuvoton_qspi_write(qspi, val, NUVOTON_QSPI_FIFOCTL_OFFSET);
+
+ /* FIFO reset is extremely fast, safe to keep atomic for this micro-wait */
+ return readl_poll_timeout_atomic(qspi->regs + NUVOTON_QSPI_STATUS_OFFSET,
+ val,
+ !(val & NUVOTON_QSPI_STATUS_TXRXRST_MASK),
+ 1, NUVOTON_QSPI_TIMEOUT_US);
+}
+
+static int nuvoton_qspi_set_speed(struct nuvoton_qspi *qspi, u32 speed_hz)
+{
+ unsigned long clk_rate;
+ u32 div;
+
+ if (!speed_hz)
+ return -EINVAL;
+
+ if (qspi->speed_hz == speed_hz)
+ return 0;
+
+ clk_rate = clk_get_rate(qspi->clk);
+ if (!clk_rate) {
+ dev_err(qspi->dev, "failed to get clock rate\n");
+ return -EINVAL;
+ }
+
+ div = DIV_ROUND_UP(clk_rate, speed_hz) - 1;
+ if (div > FIELD_MAX(NUVOTON_QSPI_CLKDIV_MASK)) {
+ dev_err(qspi->dev, "unsupported SPI clock %u Hz\n", speed_hz);
+ return -EINVAL;
+ }
+
+ nuvoton_qspi_write(qspi, FIELD_PREP(NUVOTON_QSPI_CLKDIV_MASK, div),
+ NUVOTON_QSPI_CLKDIV_OFFSET);
+ qspi->speed_hz = speed_hz;
+
+ return 0;
+}
+
+static int nuvoton_qspi_set_bits_per_word(struct nuvoton_qspi *qspi, u8 bpw)
+{
+ u32 val;
+
+ if (bpw != 8 && bpw != 16 && bpw != 32)
+ return -EINVAL;
+
+ if (bpw == 32)
+ val = NUVOTON_QSPI_CTL_REORDER_MASK;
+ else
+ val = FIELD_PREP(NUVOTON_QSPI_CTL_DWIDTH_MASK, bpw);
+
+ nuvoton_qspi_update_bits(qspi, NUVOTON_QSPI_CTL_OFFSET,
+ NUVOTON_QSPI_CTL_DWIDTH_MASK |
+ NUVOTON_QSPI_CTL_REORDER_MASK, val);
+ qspi->bits_per_word = bpw;
+
+ return 0;
+}
+
+static int nuvoton_qspi_setup_transfer(struct spi_device *spi,
+ struct spi_transfer *xfer)
+{
+ struct nuvoton_qspi *qspi = spi_controller_get_devdata(spi->controller);
+ u32 speed_hz = spi->max_speed_hz;
+ u32 mode = spi->mode & SPI_MODE_X_MASK;
+ u8 bpw = spi->bits_per_word;
+ u32 ctl = 0;
+ int ret;
+
+ if (!bpw)
+ bpw = NUVOTON_QSPI_DEFAULT_BPW;
+
+ if (xfer) {
+ if (xfer->bits_per_word)
+ bpw = xfer->bits_per_word;
+ if (xfer->speed_hz)
+ speed_hz = xfer->speed_hz;
+ }
+
+ ret = nuvoton_qspi_set_speed(qspi, speed_hz);
+ if (ret)
+ return ret;
+
+ ret = nuvoton_qspi_set_bits_per_word(qspi, bpw);
+ if (ret)
+ return ret;
+
+ if (mode == SPI_MODE_0 || mode == SPI_MODE_3)
+ ctl |= NUVOTON_QSPI_CTL_TXNEG_MASK;
+ else
+ ctl |= NUVOTON_QSPI_CTL_RXNEG_MASK;
+
+ if (spi->mode & SPI_CPOL)
+ ctl |= NUVOTON_QSPI_CTL_CLKPOL_MASK;
+
+ if (spi->mode & SPI_LSB_FIRST)
+ ctl |= NUVOTON_QSPI_CTL_LSB_MASK;
+
+ nuvoton_qspi_update_bits(qspi, NUVOTON_QSPI_CTL_OFFSET,
+ NUVOTON_QSPI_CTL_TXNEG_MASK |
+ NUVOTON_QSPI_CTL_RXNEG_MASK |
+ NUVOTON_QSPI_CTL_CLKPOL_MASK |
+ NUVOTON_QSPI_CTL_LSB_MASK, ctl);
+
+ return 0;
+}
+
+static void nuvoton_qspi_set_bus_width(struct nuvoton_qspi *qspi,
+ unsigned int buswidth,
+ enum spi_mem_data_dir dir)
+{
+ u32 ctl = 0;
+
+ if (buswidth == 4)
+ ctl |= NUVOTON_QSPI_CTL_QUADIOEN_MASK;
+ else if (buswidth == 2)
+ ctl |= NUVOTON_QSPI_CTL_DUALIOEN_MASK;
+
+ if (buswidth > 1 && dir == SPI_MEM_DATA_OUT)
+ ctl |= NUVOTON_QSPI_CTL_DATDIR_MASK;
+
+ nuvoton_qspi_update_bits(qspi, NUVOTON_QSPI_CTL_OFFSET,
+ NUVOTON_QSPI_CTL_QUADIOEN_MASK |
+ NUVOTON_QSPI_CTL_DUALIOEN_MASK |
+ NUVOTON_QSPI_CTL_DATDIR_MASK, ctl);
+}
+
+static u32 nuvoton_qspi_tx_word(const void *txbuf, unsigned int idx, u8 bpw)
+{
+ if (!txbuf)
+ return 0;
+
+ if (bpw <= 8)
+ return ((const u8 *)txbuf)[idx];
+ if (bpw <= 16)
+ return ((const u16 *)txbuf)[idx];
+
+ return ((const u32 *)txbuf)[idx];
+}
+
+static void nuvoton_qspi_rx_word(void *rxbuf, unsigned int idx, u32 val, u8 bpw)
+{
+ if (!rxbuf)
+ return;
+
+ if (bpw <= 8)
+ ((u8 *)rxbuf)[idx] = val;
+ else if (bpw <= 16)
+ ((u16 *)rxbuf)[idx] = val;
+ else
+ ((u32 *)rxbuf)[idx] = val;
+}
+
+static int nuvoton_qspi_wait_tx_not_full(struct nuvoton_qspi *qspi)
+{
+ u32 val;
+
+ return readl_poll_timeout_atomic(qspi->regs + NUVOTON_QSPI_STATUS_OFFSET,
+ val,
+ !(val & NUVOTON_QSPI_STATUS_TXFULL_MASK),
+ 0, NUVOTON_QSPI_TIMEOUT_US);
+}
+
+static int nuvoton_qspi_wait_rx_not_empty(struct nuvoton_qspi *qspi)
+{
+ u32 val;
+
+ return readl_poll_timeout_atomic(qspi->regs + NUVOTON_QSPI_STATUS_OFFSET,
+ val,
+ !(val & NUVOTON_QSPI_STATUS_RXEMPTY_MASK),
+ 0, NUVOTON_QSPI_TIMEOUT_US);
+}
+
+static int nuvoton_qspi_txrx(struct nuvoton_qspi *qspi, const void *txbuf,
+ void *rxbuf, unsigned int len)
+{
+ unsigned int bytes_per_word = DIV_ROUND_UP(qspi->bits_per_word, 8);
+ unsigned int words;
+ u32 val;
+ int ret;
+ int i;
+
+ if (!len)
+ return 0;
+
+ if (len % bytes_per_word)
+ return -EINVAL;
+
+ words = len / bytes_per_word;
+
+ ret = nuvoton_qspi_reset_fifo(qspi);
+ if (ret) {
+ dev_err(qspi->dev, "FIFO reset timed out\n");
+ return ret;
+ }
+
+ /*
+ * Use conservative word-by-word PIO access. This keeps the initial driver
+ * simple and avoids relying on FIFO threshold interrupts or DMA support.
+ */
+ for (i = 0; i < words; i++) {
+ ret = nuvoton_qspi_wait_tx_not_full(qspi);
+ if (ret) {
+ dev_err(qspi->dev, "TX FIFO full timeout\n");
+ return ret;
+ }
+
+ nuvoton_qspi_write(qspi, nuvoton_qspi_tx_word(txbuf, i,
+ qspi->bits_per_word),
+ NUVOTON_QSPI_TX_OFFSET);
+
+ if (rxbuf) {
+ ret = nuvoton_qspi_wait_rx_not_empty(qspi);
+ if (ret) {
+ dev_err(qspi->dev, "RX FIFO empty timeout\n");
+ return ret;
+ }
+
+ val = nuvoton_qspi_read(qspi, NUVOTON_QSPI_RX_OFFSET);
+ nuvoton_qspi_rx_word(rxbuf, i, val, qspi->bits_per_word);
+ }
+ }
+
+ ret = nuvoton_qspi_wait_ready(qspi);
+ if (ret)
+ dev_err(qspi->dev, "controller busy timeout\n");
+
+ return ret;
+}
+
+static int nuvoton_qspi_hw_init(struct nuvoton_qspi *qspi)
+{
+ u32 val;
+ int ret;
+
+ ret = nuvoton_qspi_set_bits_per_word(qspi, NUVOTON_QSPI_DEFAULT_BPW);
+ if (ret)
+ return ret;
+
+ nuvoton_qspi_update_bits(qspi, NUVOTON_QSPI_CTL_OFFSET,
+ NUVOTON_QSPI_CTL_SUSPITV_MASK |
+ NUVOTON_QSPI_CTL_TXNEG_MASK |
+ NUVOTON_QSPI_CTL_RXNEG_MASK |
+ NUVOTON_QSPI_CTL_CLKPOL_MASK |
+ NUVOTON_QSPI_CTL_LSB_MASK,
+ NUVOTON_QSPI_CTL_TXNEG_MASK);
+
+ val = nuvoton_qspi_read(qspi, NUVOTON_QSPI_CTL_OFFSET);
+ nuvoton_qspi_write(qspi, val | NUVOTON_QSPI_CTL_SPIEN_MASK,
+ NUVOTON_QSPI_CTL_OFFSET);
+
+ ret = readl_poll_timeout(qspi->regs + NUVOTON_QSPI_STATUS_OFFSET, val,
+ (val & NUVOTON_QSPI_STATUS_SPIENSTS_MASK),
+ 1, NUVOTON_QSPI_TIMEOUT_US);
+ if (ret) {
+ dev_err(qspi->dev, "failed to enable controller\n");
+ return ret;
+ }
+
+ ret = nuvoton_qspi_reset_fifo(qspi);
+ if (ret)
+ dev_err(qspi->dev, "FIFO reset timed out\n");
+
+ return ret;
+}
+
+static bool nuvoton_qspi_mem_supports_op(struct spi_mem *mem,
+ const struct spi_mem_op *op)
+{
+ if (!spi_mem_default_supports_op(mem, op))
+ return false;
+
+ if (op->cmd.buswidth > 4 || op->addr.buswidth > 4 ||
+ op->dummy.buswidth > 4 || op->data.buswidth > 4)
+ return false;
+
+ if (op->addr.nbytes > 4)
+ return false;
+
+ return true;
+}
+
+static void nuvoton_qspi_set_cs(struct spi_device *spi, bool enable)
+{
+ struct nuvoton_qspi *qspi = spi_controller_get_devdata(spi->controller);
+ unsigned int cs = spi_get_chipselect(spi, 0);
+ u32 mask;
+ u32 val;
+
+ if (cs == 0)
+ mask = NUVOTON_QSPI_SSCTL_SS0_MASK;
+ else
+ mask = NUVOTON_QSPI_SSCTL_SS1_MASK;
+
+ val = nuvoton_qspi_read(qspi, NUVOTON_QSPI_SSCTL_OFFSET);
+
+ /* SPI core passes enable=true when CS is asserted (typically active-low) */
+ if (enable)
+ val |= mask;
+ else
+ val &= ~mask;
+
+ nuvoton_qspi_write(qspi, val, NUVOTON_QSPI_SSCTL_OFFSET);
+}
+
+static int nuvoton_qspi_mem_exec_op(struct spi_mem *mem,
+ const struct spi_mem_op *op)
+{
+ struct spi_device *spi = mem->spi;
+ struct nuvoton_qspi *qspi = spi_controller_get_devdata(spi->controller);
+ u8 addr[4];
+ int ret;
+ int i;
+
+ ret = nuvoton_qspi_setup_transfer(spi, NULL);
+ if (ret)
+ return ret;
+
+ nuvoton_qspi_set_cs(spi, true);
+
+ nuvoton_qspi_set_bus_width(qspi, op->cmd.buswidth, SPI_MEM_DATA_OUT);
+ ret = nuvoton_qspi_txrx(qspi, &op->cmd.opcode, NULL, 1);
+ if (ret)
+ goto out_deassert_cs;
+
+ if (op->addr.nbytes) {
+ for (i = 0; i < op->addr.nbytes; i++)
+ addr[i] = op->addr.val >> (8 * (op->addr.nbytes - i - 1));
+
+ nuvoton_qspi_set_bus_width(qspi, op->addr.buswidth,
+ SPI_MEM_DATA_OUT);
+ ret = nuvoton_qspi_txrx(qspi, addr, NULL, op->addr.nbytes);
+ if (ret)
+ goto out_deassert_cs;
+ }
+
+ if (op->dummy.nbytes) {
+ nuvoton_qspi_set_bus_width(qspi, op->dummy.buswidth,
+ SPI_MEM_DATA_OUT);
+ ret = nuvoton_qspi_txrx(qspi, NULL, NULL, op->dummy.nbytes);
+ if (ret)
+ goto out_deassert_cs;
+ }
+
+ if (op->data.nbytes) {
+ nuvoton_qspi_set_bus_width(qspi, op->data.buswidth,
+ op->data.dir);
+ ret = nuvoton_qspi_txrx(qspi,
+ op->data.dir == SPI_MEM_DATA_OUT ?
+ op->data.buf.out : NULL,
+ op->data.dir == SPI_MEM_DATA_IN ?
+ op->data.buf.in : NULL,
+ op->data.nbytes);
+ }
+
+out_deassert_cs:
+ nuvoton_qspi_set_bus_width(qspi, 1, SPI_MEM_DATA_IN);
+ nuvoton_qspi_set_cs(spi, false);
+
+ return ret;
+}
+
+static const struct spi_controller_mem_ops nuvoton_qspi_mem_ops = {
+ .supports_op = nuvoton_qspi_mem_supports_op,
+ .exec_op = nuvoton_qspi_mem_exec_op,
+};
+
+static int nuvoton_qspi_transfer_one(struct spi_controller *ctlr,
+ struct spi_device *spi,
+ struct spi_transfer *xfer)
+{
+ struct nuvoton_qspi *qspi = spi_controller_get_devdata(ctlr);
+ enum spi_mem_data_dir dir = SPI_MEM_DATA_IN;
+ unsigned int buswidth = 1;
+ int ret;
+
+ ret = nuvoton_qspi_setup_transfer(spi, xfer);
+ if (ret)
+ return ret;
+
+ if (xfer->tx_buf) {
+ dir = SPI_MEM_DATA_OUT;
+ if (xfer->tx_nbits == SPI_NBITS_QUAD)
+ buswidth = 4;
+ else if (xfer->tx_nbits == SPI_NBITS_DUAL)
+ buswidth = 2;
+ } else if (xfer->rx_buf) {
+ if (xfer->rx_nbits == SPI_NBITS_QUAD)
+ buswidth = 4;
+ else if (xfer->rx_nbits == SPI_NBITS_DUAL)
+ buswidth = 2;
+ }
+
+ nuvoton_qspi_set_bus_width(qspi, buswidth, dir);
+ ret = nuvoton_qspi_txrx(qspi, xfer->tx_buf, xfer->rx_buf, xfer->len);
+ nuvoton_qspi_set_bus_width(qspi, 1, SPI_MEM_DATA_IN);
+
+ return ret;
+}
+
+static int nuvoton_qspi_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct spi_controller *ctlr;
+ struct nuvoton_qspi *qspi;
+ int ret;
+
+ ctlr = devm_spi_alloc_host(dev, sizeof(*qspi));
+ if (!ctlr)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, ctlr);
+
+ qspi = spi_controller_get_devdata(ctlr);
+ qspi->dev = dev;
+ qspi->bits_per_word = NUVOTON_QSPI_DEFAULT_BPW;
+
+ qspi->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(qspi->regs))
+ return PTR_ERR(qspi->regs);
+
+ qspi->clk = devm_clk_get_enabled(dev, NULL);
+ if (IS_ERR(qspi->clk))
+ return dev_err_probe(dev, PTR_ERR(qspi->clk),
+ "failed to get and enable clock\n");
+
+ ctlr->num_chipselect = NUVOTON_QSPI_DEFAULT_NUM_CS;
+ ctlr->mem_ops = &nuvoton_qspi_mem_ops;
+ ctlr->set_cs = nuvoton_qspi_set_cs;
+ ctlr->transfer_one = nuvoton_qspi_transfer_one;
+ ctlr->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16) |
+ SPI_BPW_MASK(32);
+ ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST |
+ SPI_RX_DUAL | SPI_TX_DUAL |
+ SPI_RX_QUAD | SPI_TX_QUAD;
+ ctlr->dev.of_node = dev->of_node;
+
+ ret = nuvoton_qspi_hw_init(qspi);
+ if (ret)
+ return ret;
+
+ ret = devm_spi_register_controller(dev, ctlr);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to register spi controller\n");
+
+ return 0;
+}
+
+static const struct of_device_id nuvoton_qspi_of_match[] = {
+ { .compatible = "nuvoton,ma35d1-qspi" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, nuvoton_qspi_of_match);
+
+static struct platform_driver nuvoton_qspi_driver = {
+ .driver = {
+ .name = "ma35d1-qspi",
+ .of_match_table = nuvoton_qspi_of_match,
+ },
+ .probe = nuvoton_qspi_probe,
+};
+module_platform_driver(nuvoton_qspi_driver);
+
+MODULE_DESCRIPTION("Nuvoton MA35D1 QSPI controller driver");
+MODULE_AUTHOR("Chi-Wen Weng <cwweng@nuvoton.com>");
+MODULE_LICENSE("GPL");
--
2.25.1
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