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[60.250.196.139]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84338319d4esm1417446b3a.51.2026.06.11.02.13.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Jun 2026 02:13:37 -0700 (PDT) From: Chi-Wen Weng To: broonie@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, cwweng@nuvoton.com, cwweng.linux@gmail.com Subject: [PATCH v3 2/2] spi: ma35d1-qspi: Add Nuvoton MA35D1 QSPI controller support Date: Thu, 11 Jun 2026 17:12:46 +0800 Message-Id: <20260611091246.2070485-3-cwweng.linux@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260611091246.2070485-1-cwweng.linux@gmail.com> References: <20260611091246.2070485-1-cwweng.linux@gmail.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Chi-Wen Weng Add SPI controller driver support for the Nuvoton MA35D1 Quad SPI controller. The controller supports standard SPI transfers and spi-mem operations for SPI memory devices such as SPI NOR and SPI NAND flashes. The driver supports single, dual and quad I/O modes and uses a conservative word-by-word PIO transfer path for the initial upstream version. The driver also handles controller reset, clock divider programming, chip-select control, transfer mode setup and spi-mem command/address/ dummy/data phases. Signed-off-by: Chi-Wen Weng --- drivers/spi/Kconfig | 10 + drivers/spi/Makefile | 1 + drivers/spi/spi-ma35d1-qspi.c | 633 ++++++++++++++++++++++++++++++++++ 3 files changed, 644 insertions(+) create mode 100644 drivers/spi/spi-ma35d1-qspi.c diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index b563f49e2197..8b8297ee3f2e 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -694,6 +694,16 @@ 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" + depends on ARCH_MA35 || COMPILE_TEST + help + This enables support for the Quad SPI controller found in + Nuvoton MA35D1 SoCs. + + The controller supports SPI memory devices such as SPI NOR and + SPI NAND flashes in single, dual and quad I/O modes. + 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..c5bb0efd108c 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..d3e687b6a06d --- /dev/null +++ b/drivers/spi/spi-ma35d1-qspi.c @@ -0,0 +1,633 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +// +// Nuvoton MA35D1 QSPI controller driver +// +// Copyright (c) 2026 Nuvoton Technology Corp. +// Author: Chi-Wen Weng + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* 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_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_SPIENSTS_MASK BIT(15) /* QSPI Enable Status */ +#define NUVOTON_QSPI_STATUS_RXEMPTY_MASK BIT(8) /* Receive FIFO Empty */ +#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); + + /* + * Give the controller a short time to latch the FIFO reset request + * before polling the reset status bit. + */ + udelay(1); + + 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, + u32 speed_hz, u8 bpw) +{ + struct nuvoton_qspi *qspi = spi_controller_get_devdata(spi->controller); + u32 mode = spi->mode & SPI_MODE_X_MASK; + u32 ctl = 0; + int ret; + + if (!speed_hz) + speed_hz = spi->max_speed_hz; + + if (!bpw) + bpw = NUVOTON_QSPI_DEFAULT_BPW; + + 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. + * + * The MA35D1 QSPI controller pushes one RX FIFO entry for each TX word in + * single, dual-output and quad-output modes. Drain RX after every TX word + * and discard the value for TX-only transfers to avoid RX FIFO overflow. + */ + 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); + + 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); + if (rxbuf) + 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->cmd.nbytes != 1) + return false; + + if (op->addr.nbytes > 4) + return false; + + return true; +} + +static void nuvoton_qspi_set_cs_level(struct nuvoton_qspi *qspi, + unsigned int cs, bool assert) +{ + u32 mask; + u32 val; + + switch (cs) { + case 0: + mask = NUVOTON_QSPI_SSCTL_SS0_MASK; + break; + case 1: + mask = NUVOTON_QSPI_SSCTL_SS1_MASK; + break; + default: + dev_warn(qspi->dev, "invalid chip select %u\n", cs); + return; + } + + val = nuvoton_qspi_read(qspi, NUVOTON_QSPI_SSCTL_OFFSET); + + if (assert) + val |= mask; + else + val &= ~mask; + + nuvoton_qspi_write(qspi, val, NUVOTON_QSPI_SSCTL_OFFSET); +} + +static void nuvoton_qspi_set_cs(struct spi_device *spi, bool enable) +{ + struct nuvoton_qspi *qspi = spi_controller_get_devdata(spi->controller); + + nuvoton_qspi_set_cs_level(qspi, spi_get_chipselect(spi, 0), enable); +} + +static void nuvoton_qspi_mem_set_cs(struct spi_device *spi, bool enable) +{ + struct nuvoton_qspi *qspi = spi_controller_get_devdata(spi->controller); + bool assert = enable; + + if (spi->mode & SPI_CS_HIGH) + assert = !assert; + + nuvoton_qspi_set_cs_level(qspi, spi_get_chipselect(spi, 0), assert); +} + +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 opcode = op->cmd.opcode; + u8 addr[4]; + int ret; + int i; + + ret = nuvoton_qspi_setup_transfer(spi, op->max_freq, NUVOTON_QSPI_DEFAULT_BPW); + if (ret) + return ret; + + nuvoton_qspi_mem_set_cs(spi, true); + + nuvoton_qspi_set_bus_width(qspi, op->cmd.buswidth, SPI_MEM_DATA_OUT); + ret = nuvoton_qspi_txrx(qspi, &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_IN); + 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_mem_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 const struct spi_controller_mem_caps nuvoton_qspi_mem_caps = { + .per_op_freq = true, +}; + +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->speed_hz, xfer->bits_per_word); + if (ret) + return ret; + + if (xfer->tx_buf && xfer->rx_buf) { + if (xfer->tx_nbits != SPI_NBITS_SINGLE || + xfer->rx_nbits != SPI_NBITS_SINGLE) + return -EOPNOTSUPP; + } + + 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; + struct reset_control *rst; + 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); + + rst = devm_reset_control_get_exclusive(dev, NULL); + if (IS_ERR(rst)) + return dev_err_probe(dev, PTR_ERR(rst), + "failed to get reset\n"); + + 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"); + + ret = reset_control_assert(rst); + if (ret) + return dev_err_probe(dev, ret, "failed to assert reset\n"); + + udelay(2); + + ret = reset_control_deassert(rst); + if (ret) + return dev_err_probe(dev, ret, "failed to deassert reset\n"); + + ctlr->num_chipselect = NUVOTON_QSPI_DEFAULT_NUM_CS; + ctlr->mem_ops = &nuvoton_qspi_mem_ops; + ctlr->mem_caps = &nuvoton_qspi_mem_caps; + 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_CS_HIGH | 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 "); +MODULE_LICENSE("GPL"); -- 2.25.1