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Message-Id: <20221118005904.23557-3-hayashi.kunihiko@socionext.com>
Date: Fri, 18 Nov 2022 09:59:04 +0900
From: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To: Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc: linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
Subject: [PATCH 2/2] spi: Add Socionext F_OSPI SPI flash controller driver
Introduce Socionext F_OSPI controller driver. This controller is used to
communicate with slave devices such as SPI Flash memories. It supports
4 slave devices and up to 8-bit wide bus, but supports master mode only.
This driver uses spi-mem framework for SPI flash memory access, and
can only operate indirect access mode and single data rate mode.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
---
drivers/spi/Kconfig | 9 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-sn-f-ospi.c | 818 ++++++++++++++++++++++++++++++++++++
3 files changed, 828 insertions(+)
create mode 100644 drivers/spi/spi-sn-f-ospi.c
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index cb7e3a8ef3a5..c6fb8cd6d2ae 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -906,6 +906,15 @@ config SPI_SLAVE_MT27XX
say Y or M here.If you are not sure, say N.
SPI slave drivers for Mediatek MT27XX series ARM SoCs.
+config SPI_SN_F_OSPI
+ tristate "Socionext F_OSPI SPI flash controller"
+ depends on OF && HAS_IOMEM
+ depends on SPI_MEM
+ help
+ This enables support for the Socionext F_OSPI controller
+ for connecting an SPI Flash memory over up to 8-bit wide bus.
+ It supports indirect access mode only.
+
config SPI_SPRD
tristate "Spreadtrum SPI controller"
depends on ARCH_SPRD || COMPILE_TEST
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 60d0b2f611f1..971bd62e4481 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -121,6 +121,7 @@ obj-$(CONFIG_SPI_SH_MSIOF) += spi-sh-msiof.o
obj-$(CONFIG_SPI_SH_SCI) += spi-sh-sci.o
obj-$(CONFIG_SPI_SIFIVE) += spi-sifive.o
obj-$(CONFIG_SPI_SLAVE_MT27XX) += spi-slave-mt27xx.o
+obj-$(CONFIG_SPI_SN_F_OSPI) += spi-sn-f-ospi.o
obj-$(CONFIG_SPI_SPRD) += spi-sprd.o
obj-$(CONFIG_SPI_SPRD_ADI) += spi-sprd-adi.o
obj-$(CONFIG_SPI_STM32) += spi-stm32.o
diff --git a/drivers/spi/spi-sn-f-ospi.c b/drivers/spi/spi-sn-f-ospi.c
new file mode 100644
index 000000000000..cd935fa86a6d
--- /dev/null
+++ b/drivers/spi/spi-sn-f-ospi.c
@@ -0,0 +1,818 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Socionext SPI flash controller F_OSPI driver
+ * Copyright (C) 2021 Socionext Inc.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi-mem.h>
+
+/* Registers */
+#define OSPI_PROT_CTL_INDIR 0x00
+#define OSPI_PROT_MODE_DATA_MASK GENMASK(31, 30)
+#define OSPI_PROT_MODE_ALT_MASK GENMASK(29, 28)
+#define OSPI_PROT_MODE_ADDR_MASK GENMASK(27, 26)
+#define OSPI_PROT_MODE_CODE_MASK GENMASK(25, 24)
+#define OSPI_PROT_MODE_SINGLE 0
+#define OSPI_PROT_MODE_DUAL 1
+#define OSPI_PROT_MODE_QUAD 2
+#define OSPI_PROT_MODE_OCTAL 3
+#define OSPI_PROT_DATA_RATE_DATA BIT(23)
+#define OSPI_PROT_DATA_RATE_ALT BIT(22)
+#define OSPI_PROT_DATA_RATE_ADDR BIT(21)
+#define OSPI_PROT_DATA_RATE_CODE BIT(20)
+#define OSPI_PROT_SDR 0
+#define OSPI_PROT_DDR 1
+#define OSPI_PROT_BIT_POS_DATA BIT(19)
+#define OSPI_PROT_BIT_POS_ALT BIT(18)
+#define OSPI_PROT_BIT_POS_ADDR BIT(17)
+#define OSPI_PROT_BIT_POS_CODE BIT(16)
+#define OSPI_PROT_SAMP_EDGE BIT(12)
+#define OSPI_PROT_DATA_UNIT_MASK GENMASK(11, 10)
+#define OSPI_PROT_DATA_UNIT_1B 0
+#define OSPI_PROT_DATA_UNIT_2B 1
+#define OSPI_PROT_DATA_UNIT_4B 3
+#define OSPI_PROT_TRANS_DIR_WRITE BIT(9)
+#define OSPI_PROT_DATA_EN BIT(8)
+#define OSPI_PROT_ALT_SIZE_MASK GENMASK(7, 5)
+#define OSPI_PROT_ADDR_SIZE_MASK GENMASK(4, 2)
+#define OSPI_PROT_CODE_SIZE_MASK GENMASK(1, 0)
+
+#define OSPI_CLK_CTL 0x10
+#define OSPI_CLK_CTL_BOOT_INT_CLK_EN BIT(16)
+#define OSPI_CLK_CTL_PHA BIT(12)
+#define OSPI_CLK_CTL_PHA_180 0
+#define OSPI_CLK_CTL_PHA_90 1
+#define OSPI_CLK_CTL_DIV GENMASK(9, 8)
+#define OSPI_CLK_CTL_DIV_1 0
+#define OSPI_CLK_CTL_DIV_2 1
+#define OSPI_CLK_CTL_DIV_4 2
+#define OSPI_CLK_CTL_DIV_8 3
+#define OSPI_CLK_CTL_INT_CLK_EN BIT(0)
+
+#define OSPI_CS_CTL1 0x14
+#define OSPI_CS_CTL1_CS_START_MASK GENMASK(7, 4)
+#define OSPI_CS_CTL1_CS_END_MASK GENMASK(3, 0)
+
+#define OSPI_CS_CTL2 0x18
+#define OSPI_CS_CTL2_CS_DESEL_CYC_MASK GENMASK(7, 4)
+#define OSPI_CS_CTL2_CS_DESEL_EN BIT(0)
+
+#define OSPI_SSEL 0x20
+#define OSPI_CMD_IDX_INDIR 0x40
+#define OSPI_ADDR 0x50
+#define OSPI_ALT_INDIR 0x60
+#define OSPI_DMY_INDIR 0x70
+#define OSPI_DAT 0x80
+#define OSPI_DAT_SWP_INDIR 0x90
+#define OSPI_DAT_SWP_EN BIT(8)
+#define OSPI_DAT_SWP_4TH_BYTE GENMASK(7, 6)
+#define OSPI_DAT_SWP_3RD_BYTE GENMASK(5, 4)
+#define OSPI_DAT_SWP_2ND_BYTE GENMASK(3, 2)
+#define OSPI_DAT_SWP_1ST_BYTE GENMASK(1, 0)
+
+#define OSPI_DAT_SIZE_INDIR 0xA0
+#define OSPI_DAT_SIZE_EN BIT(15)
+#define OSPI_DAT_SIZE_MASK GENMASK(10, 0)
+#define OSPI_DAT_SIZE_MAX (OSPI_DAT_SIZE_MASK + 1)
+
+#define OSPI_TRANS_CTL 0xC0
+#define OSPI_TRANS_CTL_STOP_REQ BIT(1) /* RW1AC */
+#define OSPI_TRANS_CTL_START_REQ BIT(0) /* RW1AC */
+
+#define OSPI_ACC_MODE 0xC4
+#define OSPI_ACC_MODE_BOOT_DISABLE BIT(0)
+
+#define OSPI_SWRST 0xD0
+#define OSPI_SWRST_INDIR_WRITE_FIFO BIT(9) /* RW1AC */
+#define OSPI_SWRST_INDIR_READ_FIFO BIT(8) /* RW1AC */
+
+#define OSPI_STAT 0xE0
+#define OSPI_STAT_IS_AXI_WRITING BIT(10)
+#define OSPI_STAT_IS_AXI_READING BIT(9)
+#define OSPI_STAT_IS_SPI_INT_CLK_STOP BIT(4)
+#define OSPI_STAT_IS_SPI_IDLE BIT(3)
+
+#define OSPI_IRQ 0xF0
+#define OSPI_IRQ_CS_DEASSERT BIT(8)
+#define OSPI_IRQ_WRITE_BUF_READY BIT(2)
+#define OSPI_IRQ_READ_BUF_READY BIT(1)
+#define OSPI_IRQ_CS_TRANS_COMP BIT(0)
+#define OSPI_IRQ_ALL \
+ (OSPI_IRQ_CS_DEASSERT | OSPI_IRQ_WRITE_BUF_READY \
+ | OSPI_IRQ_READ_BUF_READY | OSPI_IRQ_CS_TRANS_COMP)
+
+#define OSPI_IRQ_STAT_EN 0xF4
+#define OSPI_IRQ_SIG_EN 0xF8
+
+/* Parameters */
+#define OSPI_NUM_CS 4
+#define OSPI_DUMMY_CYCLE_MAX 255
+#define OSPI_WAIT_MAX_MSEC 100
+
+enum f_ospi_swap_mode {
+ OSPI_SWAP_MODE_NONE = 0,
+ OSPI_SWAP_MODE_2BYTE,
+ OSPI_SWAP_MODE_4BYTE,
+};
+
+struct f_ospi {
+ struct mutex mlock;
+ void __iomem *base;
+ struct device *dev;
+ struct clk *clk;
+
+ u8 cs_cyc_start;
+ u8 cs_cyc_end;
+ u8 cs_cyc_deassert;
+ bool cs_cyc_deassert_en;
+
+ struct {
+ u8 nbytes;
+ u8 buswidth;
+ u32 val;
+ } alt;
+
+ enum f_ospi_swap_mode swap_mode;
+};
+
+static u32 f_ospi_get_dummy_cycle(const struct spi_mem_op *op)
+{
+ return (op->dummy.nbytes * 8) / op->dummy.buswidth;
+}
+
+static void f_ospi_clear_irq(struct f_ospi *ospi)
+{
+ writel(OSPI_IRQ_CS_DEASSERT | OSPI_IRQ_CS_TRANS_COMP,
+ ospi->base + OSPI_IRQ);
+}
+
+static void f_ospi_enable_irq_status(struct f_ospi *ospi, u32 irq_bits)
+{
+ u32 val;
+
+ val = readl(ospi->base + OSPI_IRQ_STAT_EN);
+ val |= irq_bits;
+ writel(val, ospi->base + OSPI_IRQ_STAT_EN);
+}
+
+static void f_ospi_disable_irq_status(struct f_ospi *ospi, u32 irq_bits)
+{
+ u32 val;
+
+ val = readl(ospi->base + OSPI_IRQ_STAT_EN);
+ val &= ~irq_bits;
+ writel(val, ospi->base + OSPI_IRQ_STAT_EN);
+}
+
+static void f_ospi_disable_irq_output(struct f_ospi *ospi, u32 irq_bits)
+{
+ u32 val;
+
+ val = readl(ospi->base + OSPI_IRQ_SIG_EN);
+ val &= ~irq_bits;
+ writel(val, ospi->base + OSPI_IRQ_SIG_EN);
+}
+
+static int f_ospi_prepare_config(struct f_ospi *ospi)
+{
+ u32 val, stat0, stat1;
+
+ /* G4: Disable internal clock */
+ val = readl(ospi->base + OSPI_CLK_CTL);
+ val &= ~(OSPI_CLK_CTL_BOOT_INT_CLK_EN | OSPI_CLK_CTL_INT_CLK_EN);
+ writel(val, ospi->base + OSPI_CLK_CTL);
+
+ /* G5: Wait for stop */
+ stat0 = OSPI_STAT_IS_AXI_WRITING | OSPI_STAT_IS_AXI_READING;
+ stat1 = OSPI_STAT_IS_SPI_IDLE | OSPI_STAT_IS_SPI_INT_CLK_STOP;
+
+ return readl_poll_timeout(ospi->base + OSPI_STAT,
+ val, (val & (stat0 | stat1)) == stat1,
+ 0, OSPI_WAIT_MAX_MSEC);
+}
+
+static int f_ospi_unprepare_config(struct f_ospi *ospi)
+{
+ u32 val;
+
+ /* G11: Enable internal clock */
+ val = readl(ospi->base + OSPI_CLK_CTL);
+ val |= OSPI_CLK_CTL_BOOT_INT_CLK_EN | OSPI_CLK_CTL_INT_CLK_EN;
+ writel(val, ospi->base + OSPI_CLK_CTL);
+
+ /* G12: Wait for clock to start */
+ return readl_poll_timeout(ospi->base + OSPI_STAT,
+ val, !(val & OSPI_STAT_IS_SPI_INT_CLK_STOP),
+ 0, OSPI_WAIT_MAX_MSEC);
+}
+
+static void f_ospi_config_clk(struct f_ospi *ospi, u32 device_hz)
+{
+ long rate_hz = clk_get_rate(ospi->clk);
+ u32 div = DIV_ROUND_UP(rate_hz, device_hz);
+ u32 div_reg;
+ u32 val;
+
+ if (rate_hz < device_hz) {
+ dev_warn(ospi->dev, "Device frequency too large: %d\n",
+ device_hz);
+ div_reg = OSPI_CLK_CTL_DIV_1;
+ } else {
+ if (div == 1) {
+ div_reg = OSPI_CLK_CTL_DIV_1;
+ } else if (div == 2) {
+ div_reg = OSPI_CLK_CTL_DIV_2;
+ } else if (div <= 4) {
+ div_reg = OSPI_CLK_CTL_DIV_4;
+ } else if (div <= 8) {
+ div_reg = OSPI_CLK_CTL_DIV_8;
+ } else {
+ dev_warn(ospi->dev, "Device frequency too small: %d\n",
+ device_hz);
+ div_reg = OSPI_CLK_CTL_DIV_8;
+ }
+ }
+
+ /*
+ * G7: Set clock mode
+ * clock phase is fixed at 180 degrees and configure edge direction
+ * instead.
+ */
+ val = readl(ospi->base + OSPI_CLK_CTL);
+
+ val &= ~(OSPI_CLK_CTL_PHA | OSPI_CLK_CTL_DIV);
+ val |= FIELD_PREP(OSPI_CLK_CTL_PHA, OSPI_CLK_CTL_PHA_180)
+ | FIELD_PREP(OSPI_CLK_CTL_DIV, div_reg);
+
+ writel(val, ospi->base + OSPI_CLK_CTL);
+}
+
+static void f_ospi_config_dll(struct f_ospi *ospi)
+{
+ /* G8: Configure DLL, nothing */
+}
+
+static u8 f_ospi_get_mode(struct f_ospi *ospi, int width, int data_size)
+{
+ u8 mode = OSPI_PROT_MODE_SINGLE;
+
+ switch (width) {
+ case 1:
+ mode = OSPI_PROT_MODE_SINGLE;
+ break;
+ case 2:
+ mode = OSPI_PROT_MODE_DUAL;
+ break;
+ case 4:
+ mode = OSPI_PROT_MODE_QUAD;
+ break;
+ case 8:
+ mode = OSPI_PROT_MODE_OCTAL;
+ break;
+ default:
+ if (data_size)
+ dev_err(ospi->dev, "Invalid buswidth: %d\n", width);
+ break;
+ }
+
+ return mode;
+}
+
+static void f_ospi_config_indir_protocol(struct f_ospi *ospi,
+ struct spi_mem *mem,
+ const struct spi_mem_op *op)
+{
+ struct spi_device *spi = mem->spi;
+ u8 mode;
+ u32 prot = 0, val;
+ int unit;
+
+ /* Set one chip select */
+ writel(BIT(spi->chip_select), ospi->base + OSPI_SSEL);
+
+ mode = f_ospi_get_mode(ospi, op->cmd.buswidth, 1);
+ prot |= FIELD_PREP(OSPI_PROT_MODE_CODE_MASK, mode);
+
+ mode = f_ospi_get_mode(ospi, op->addr.buswidth, op->addr.nbytes);
+ prot |= FIELD_PREP(OSPI_PROT_MODE_ADDR_MASK, mode);
+
+ mode = f_ospi_get_mode(ospi, op->data.buswidth, op->data.nbytes);
+ prot |= FIELD_PREP(OSPI_PROT_MODE_DATA_MASK, mode);
+
+ mode = f_ospi_get_mode(ospi, ospi->alt.buswidth, ospi->alt.nbytes);
+ prot |= FIELD_PREP(OSPI_PROT_MODE_ALT_MASK, mode);
+
+ prot |= FIELD_PREP(OSPI_PROT_DATA_RATE_DATA, OSPI_PROT_SDR);
+ prot |= FIELD_PREP(OSPI_PROT_DATA_RATE_ALT, OSPI_PROT_SDR);
+ prot |= FIELD_PREP(OSPI_PROT_DATA_RATE_ADDR, OSPI_PROT_SDR);
+ prot |= FIELD_PREP(OSPI_PROT_DATA_RATE_CODE, OSPI_PROT_SDR);
+
+ if (spi->mode & SPI_LSB_FIRST)
+ prot |= OSPI_PROT_BIT_POS_DATA | OSPI_PROT_BIT_POS_ALT
+ | OSPI_PROT_BIT_POS_ADDR | OSPI_PROT_BIT_POS_CODE;
+
+ if (spi->mode & SPI_CPHA)
+ prot |= OSPI_PROT_SAMP_EDGE;
+
+ /* Examine nbytes % 4 */
+ switch (op->data.nbytes & 0x3) {
+ case 0:
+ unit = OSPI_PROT_DATA_UNIT_4B;
+ val = 0;
+ break;
+ case 2:
+ unit = OSPI_PROT_DATA_UNIT_2B;
+ val = OSPI_DAT_SIZE_EN | (op->data.nbytes - 1);
+ break;
+ default:
+ unit = OSPI_PROT_DATA_UNIT_1B;
+ val = OSPI_DAT_SIZE_EN | (op->data.nbytes - 1);
+ break;
+ }
+ prot |= FIELD_PREP(OSPI_PROT_DATA_UNIT_MASK, unit);
+
+ switch (op->data.dir) {
+ case SPI_MEM_DATA_IN:
+ prot |= OSPI_PROT_DATA_EN;
+ break;
+
+ case SPI_MEM_DATA_OUT:
+ prot |= OSPI_PROT_TRANS_DIR_WRITE | OSPI_PROT_DATA_EN;
+ break;
+
+ case SPI_MEM_NO_DATA:
+ prot |= OSPI_PROT_TRANS_DIR_WRITE;
+ break;
+
+ default:
+ dev_warn(ospi->dev, "Unsupported direction");
+ break;
+ }
+
+ prot |= FIELD_PREP(OSPI_PROT_ALT_SIZE_MASK, ospi->alt.nbytes);
+ prot |= FIELD_PREP(OSPI_PROT_ADDR_SIZE_MASK, op->addr.nbytes);
+ prot |= FIELD_PREP(OSPI_PROT_CODE_SIZE_MASK, 1); /* 1byte */
+
+ writel(prot, ospi->base + OSPI_PROT_CTL_INDIR);
+ writel(val, ospi->base + OSPI_DAT_SIZE_INDIR);
+}
+
+static int f_ospi_indir_prepare_op(struct f_ospi *ospi, struct spi_mem *mem,
+ const struct spi_mem_op *op)
+{
+ struct spi_device *spi = mem->spi;
+ u32 irq_stat_en;
+ int ret;
+
+ ret = f_ospi_prepare_config(ospi);
+ if (ret)
+ return ret;
+
+ f_ospi_config_clk(ospi, spi->max_speed_hz);
+
+ f_ospi_config_indir_protocol(ospi, mem, op);
+
+ writel(f_ospi_get_dummy_cycle(op), ospi->base + OSPI_DMY_INDIR);
+ writel(op->addr.val, ospi->base + OSPI_ADDR);
+ writel(op->cmd.opcode, ospi->base + OSPI_CMD_IDX_INDIR);
+
+ f_ospi_clear_irq(ospi);
+
+ switch (op->data.dir) {
+ case SPI_MEM_DATA_IN:
+ irq_stat_en = OSPI_IRQ_READ_BUF_READY | OSPI_IRQ_CS_TRANS_COMP;
+ break;
+
+ case SPI_MEM_DATA_OUT:
+ irq_stat_en = OSPI_IRQ_WRITE_BUF_READY | OSPI_IRQ_CS_TRANS_COMP;
+ break;
+
+ case SPI_MEM_NO_DATA:
+ irq_stat_en = OSPI_IRQ_CS_TRANS_COMP;
+ break;
+
+ default:
+ dev_warn(ospi->dev, "Unsupported direction");
+ irq_stat_en = 0;
+ }
+
+ f_ospi_disable_irq_status(ospi, ~irq_stat_en);
+ f_ospi_enable_irq_status(ospi, irq_stat_en);
+
+ return f_ospi_unprepare_config(ospi);
+}
+
+static void f_ospi_indir_start_xfer(struct f_ospi *ospi)
+{
+ /* Write only 1, auto cleared */
+ writel(OSPI_TRANS_CTL_START_REQ, ospi->base + OSPI_TRANS_CTL);
+}
+
+static void f_ospi_indir_stop_xfer(struct f_ospi *ospi)
+{
+ /* Write only 1, auto cleared */
+ writel(OSPI_TRANS_CTL_STOP_REQ, ospi->base + OSPI_TRANS_CTL);
+}
+
+static int f_ospi_indir_wait_xfer_complete(struct f_ospi *ospi)
+{
+ u32 val;
+
+ return readl_poll_timeout(ospi->base + OSPI_IRQ, val,
+ val & OSPI_IRQ_CS_TRANS_COMP,
+ 0, OSPI_WAIT_MAX_MSEC);
+}
+
+static int f_ospi_indir_read(struct f_ospi *ospi, struct spi_mem *mem,
+ const struct spi_mem_op *op)
+{
+ u8 *buf = op->data.buf.in;
+ u32 val;
+ int i, ret;
+
+ mutex_lock(&ospi->mlock);
+
+ /* E1-2: Prepare transfer operation */
+ ret = f_ospi_indir_prepare_op(ospi, mem, op);
+ if (ret)
+ goto out;
+
+ f_ospi_indir_start_xfer(ospi);
+
+ /* E3-4: Wait for ready and read data */
+ for (i = 0; i < op->data.nbytes; i++) {
+ ret = readl_poll_timeout(ospi->base + OSPI_IRQ, val,
+ val & OSPI_IRQ_READ_BUF_READY,
+ 0, OSPI_WAIT_MAX_MSEC);
+ if (ret)
+ goto out;
+
+ buf[i] = readl(ospi->base + OSPI_DAT) & 0xFF;
+ }
+
+ /* E5-6: Stop transfer if data size is nothing */
+ if (!(readl(ospi->base + OSPI_DAT_SIZE_INDIR) & OSPI_DAT_SIZE_EN))
+ f_ospi_indir_stop_xfer(ospi);
+
+ /* E7-8: Wait for completion and clear */
+ ret = f_ospi_indir_wait_xfer_complete(ospi);
+ if (ret)
+ goto out;
+
+ writel(OSPI_IRQ_CS_TRANS_COMP, ospi->base + OSPI_IRQ);
+
+ /* E9: Do nothing if data size is valid */
+ if (readl(ospi->base + OSPI_DAT_SIZE_INDIR) & OSPI_DAT_SIZE_EN)
+ goto out;
+
+ /* E10-11: Reset and check read fifo */
+ writel(OSPI_SWRST_INDIR_READ_FIFO, ospi->base + OSPI_SWRST);
+
+ ret = readl_poll_timeout(ospi->base + OSPI_SWRST, val,
+ !(val & OSPI_SWRST_INDIR_READ_FIFO),
+ 0, OSPI_WAIT_MAX_MSEC);
+out:
+ mutex_unlock(&ospi->mlock);
+
+ return ret;
+}
+
+static int f_ospi_indir_write(struct f_ospi *ospi, struct spi_mem *mem,
+ const struct spi_mem_op *op)
+{
+ u8 *buf = (u8 *)op->data.buf.out;
+ u32 val;
+ int i, ret;
+
+ mutex_lock(&ospi->mlock);
+
+ /* F1-3: Prepare transfer operation */
+ ret = f_ospi_indir_prepare_op(ospi, mem, op);
+ if (ret)
+ goto out;
+
+ f_ospi_indir_start_xfer(ospi);
+
+ if (!(readl(ospi->base + OSPI_PROT_CTL_INDIR) & OSPI_PROT_DATA_EN))
+ goto nodata;
+
+ /* F4-5: Wait for buffer ready and write data */
+ for (i = 0; i < op->data.nbytes; i++) {
+ ret = readl_poll_timeout(ospi->base + OSPI_IRQ, val,
+ val & OSPI_IRQ_WRITE_BUF_READY,
+ 0, OSPI_WAIT_MAX_MSEC);
+ if (ret)
+ goto out;
+
+ writel(buf[i], ospi->base + OSPI_DAT);
+ }
+
+ /* F6-7: Stop transfer if data size is nothing */
+ if (!(readl(ospi->base + OSPI_DAT_SIZE_INDIR) & OSPI_DAT_SIZE_EN))
+ f_ospi_indir_stop_xfer(ospi);
+
+nodata:
+ /* F8-9: Wait for completion and clear */
+ ret = f_ospi_indir_wait_xfer_complete(ospi);
+ if (ret)
+ goto out;
+
+ writel(OSPI_IRQ_CS_TRANS_COMP, ospi->base + OSPI_IRQ);
+out:
+ mutex_unlock(&ospi->mlock);
+
+ return ret;
+}
+
+static int f_ospi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
+{
+ struct f_ospi *ospi = spi_controller_get_devdata(mem->spi->master);
+ int err = 0;
+
+ switch (op->data.dir) {
+ case SPI_MEM_DATA_IN:
+ err = f_ospi_indir_read(ospi, mem, op);
+ break;
+
+ case SPI_MEM_DATA_OUT:
+ fallthrough;
+ case SPI_MEM_NO_DATA:
+ err = f_ospi_indir_write(ospi, mem, op);
+ break;
+
+ default:
+ dev_warn(ospi->dev, "Unsupported direction");
+ err = -EOPNOTSUPP;
+ }
+
+ return err;
+}
+
+static bool f_ospi_supports_op_width(struct spi_mem *mem,
+ const struct spi_mem_op *op)
+{
+ u8 width_available[] = { 0, 1, 2, 4, 8 };
+ u8 width_op[] = { op->cmd.buswidth, op->addr.buswidth,
+ op->dummy.buswidth, op->data.buswidth };
+ bool is_match_found;
+ int i, j;
+
+ for (i = 0; i < ARRAY_SIZE(width_op); i++) {
+ is_match_found = false;
+
+ for (j = 0; j < ARRAY_SIZE(width_available); j++) {
+ if (width_op[i] == width_available[j]) {
+ is_match_found = true;
+ break;
+ }
+ }
+
+ if (!is_match_found)
+ return false;
+ }
+
+ return true;
+}
+
+static bool f_ospi_supports_op(struct spi_mem *mem,
+ const struct spi_mem_op *op)
+{
+ if (f_ospi_get_dummy_cycle(op) > OSPI_DUMMY_CYCLE_MAX)
+ return false;
+
+ if (op->addr.nbytes > 5)
+ return false;
+
+ if (!f_ospi_supports_op_width(mem, op))
+ return false;
+
+ return true;
+}
+
+static int f_ospi_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)
+{
+ op->data.nbytes = min((int)op->data.nbytes, (int)(OSPI_DAT_SIZE_MAX));
+
+ return 0;
+}
+
+static const struct spi_controller_mem_ops f_ospi_mem_ops = {
+ .adjust_op_size = f_ospi_adjust_op_size,
+ .supports_op = f_ospi_supports_op,
+ .exec_op = f_ospi_exec_op,
+};
+
+static int f_ospi_init(struct f_ospi *ospi)
+{
+ u32 val;
+ int ret;
+
+ ret = f_ospi_prepare_config(ospi);
+ if (ret)
+ return ret;
+
+ /* Disable boot signal */
+ writel(OSPI_ACC_MODE_BOOT_DISABLE, ospi->base + OSPI_ACC_MODE);
+
+ f_ospi_config_dll(ospi);
+
+ /* Configure DT-derived parameters */
+ writel(FIELD_PREP(OSPI_CS_CTL1_CS_START_MASK, ospi->cs_cyc_start)
+ | FIELD_PREP(OSPI_CS_CTL1_CS_END_MASK, ospi->cs_cyc_end),
+ ospi->base + OSPI_CS_CTL1);
+
+ val = FIELD_PREP(OSPI_CS_CTL2_CS_DESEL_CYC_MASK, ospi->cs_cyc_deassert)
+ | OSPI_CS_CTL2_CS_DESEL_EN;
+ writel(ospi->cs_cyc_deassert_en ? val : 0, ospi->base + OSPI_CS_CTL2);
+
+ writel(ospi->alt.val, ospi->base + OSPI_ALT_INDIR);
+
+ /* Set data byte order */
+ switch (ospi->swap_mode) {
+ case OSPI_SWAP_MODE_4BYTE:
+ val = OSPI_DAT_SWP_EN
+ | FIELD_PREP(OSPI_DAT_SWP_4TH_BYTE, 3)
+ | FIELD_PREP(OSPI_DAT_SWP_3RD_BYTE, 2)
+ | FIELD_PREP(OSPI_DAT_SWP_2ND_BYTE, 1)
+ | FIELD_PREP(OSPI_DAT_SWP_1ST_BYTE, 0);
+ break;
+ case OSPI_SWAP_MODE_2BYTE:
+ val = OSPI_DAT_SWP_EN
+ | FIELD_PREP(OSPI_DAT_SWP_4TH_BYTE, 1)
+ | FIELD_PREP(OSPI_DAT_SWP_3RD_BYTE, 0)
+ | FIELD_PREP(OSPI_DAT_SWP_2ND_BYTE, 3)
+ | FIELD_PREP(OSPI_DAT_SWP_1ST_BYTE, 2);
+ break;
+ default:
+ val = 0;
+ break;
+ }
+ writel(val, ospi->base + OSPI_DAT_SWP_INDIR);
+
+ /* Disable IRQ */
+ f_ospi_clear_irq(ospi);
+ f_ospi_disable_irq_status(ospi, OSPI_IRQ_ALL);
+ f_ospi_disable_irq_output(ospi, OSPI_IRQ_ALL);
+
+ return f_ospi_unprepare_config(ospi);
+}
+
+static void f_ospi_parse_dt(struct f_ospi *ospi, struct device_node *node)
+{
+ u32 alt[4];
+ u32 val;
+
+ if (!of_property_read_u32(node, "socionext,cs-start-cycle", &val))
+ ospi->cs_cyc_start = val;
+
+ if (!of_property_read_u32(node, "socionext,cs-end-cycle", &val))
+ ospi->cs_cyc_end = val;
+
+ if (!of_property_read_u32(node, "socionext,cs-deassert-clk-cycle",
+ &val)) {
+ ospi->cs_cyc_deassert_en = true;
+ ospi->cs_cyc_deassert = val;
+
+ if (ospi->cs_cyc_deassert > 15) {
+ dev_warn(ospi->dev, "cs-deassert-clk-cycle too large: %d\n",
+ ospi->cs_cyc_deassert);
+ ospi->cs_cyc_deassert = 0; /* infinite */
+ }
+ }
+
+ if (!of_property_read_u32_array(node, "socionext,alternative-byte",
+ alt, 3)) {
+ ospi->alt.nbytes = alt[0];
+ ospi->alt.val = alt[1];
+ ospi->alt.buswidth = alt[2];
+
+ if (ospi->alt.nbytes > 4) {
+ dev_warn(ospi->dev,
+ "alternative-byte size too large: %d\n",
+ ospi->alt.nbytes);
+ ospi->alt.nbytes = 4;
+ }
+ }
+
+ if (of_property_read_bool(node, "socionext,data-swap-2byte"))
+ ospi->swap_mode = OSPI_SWAP_MODE_2BYTE;
+ else if (of_property_read_bool(node, "socionext,data-swap-4byte"))
+ ospi->swap_mode = OSPI_SWAP_MODE_4BYTE;
+ else
+ ospi->swap_mode = OSPI_SWAP_MODE_NONE;
+}
+
+static int f_ospi_probe(struct platform_device *pdev)
+{
+ struct spi_controller *ctlr;
+ struct device *dev = &pdev->dev;
+ struct f_ospi *ospi;
+ u32 num_cs = OSPI_NUM_CS;
+ int ret;
+
+ ctlr = spi_alloc_master(dev, sizeof(*ospi));
+ if (!ctlr)
+ return -ENOMEM;
+
+ ctlr->mode_bits = SPI_TX_DUAL | SPI_TX_QUAD | SPI_TX_OCTAL
+ | SPI_RX_DUAL | SPI_RX_QUAD | SPI_TX_OCTAL
+ | SPI_MODE_0 | SPI_MODE_1 | SPI_LSB_FIRST;
+ ctlr->mem_ops = &f_ospi_mem_ops;
+ ctlr->bus_num = -1;
+ of_property_read_u32(dev->of_node, "num-cs", &num_cs);
+ if (num_cs > OSPI_NUM_CS) {
+ dev_err(dev, "num-cs too large: %d\n", num_cs);
+ return -ENOMEM;
+ }
+ ctlr->num_chipselect = num_cs;
+ ctlr->dev.of_node = dev->of_node;
+
+ ospi = spi_controller_get_devdata(ctlr);
+ ospi->dev = dev;
+
+ f_ospi_parse_dt(ospi, dev->of_node);
+
+ platform_set_drvdata(pdev, ospi);
+
+ ospi->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(ospi->base)) {
+ ret = PTR_ERR(ospi->base);
+ goto err_put_ctlr;
+ }
+
+ ospi->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(ospi->clk)) {
+ ret = PTR_ERR(ospi->clk);
+ goto err_put_ctlr;
+ }
+
+ ret = clk_prepare_enable(ospi->clk);
+ if (ret) {
+ dev_err(dev, "Failed to enable the clock\n");
+ goto err_disable_clk;
+ }
+
+ mutex_init(&ospi->mlock);
+
+ ret = f_ospi_init(ospi);
+ if (ret)
+ goto err_destroy_mutex;
+
+ ret = devm_spi_register_controller(dev, ctlr);
+ if (ret)
+ goto err_destroy_mutex;
+
+ return 0;
+
+err_destroy_mutex:
+ mutex_destroy(&ospi->mlock);
+
+err_disable_clk:
+ clk_disable_unprepare(ospi->clk);
+
+err_put_ctlr:
+ spi_controller_put(ctlr);
+
+ return ret;
+}
+
+static int f_ospi_remove(struct platform_device *pdev)
+{
+ struct f_ospi *ospi = platform_get_drvdata(pdev);
+
+ clk_disable_unprepare(ospi->clk);
+
+ mutex_destroy(&ospi->mlock);
+
+ return 0;
+}
+
+static const struct of_device_id f_ospi_dt_ids[] = {
+ { .compatible = "socionext,f-ospi" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, f_ospi_dt_ids);
+
+static struct platform_driver f_ospi_driver = {
+ .driver = {
+ .name = "socionext,f-ospi",
+ .of_match_table = f_ospi_dt_ids,
+ },
+ .probe = f_ospi_probe,
+ .remove = f_ospi_remove,
+};
+module_platform_driver(f_ospi_driver);
+
+MODULE_DESCRIPTION("Socionext F_OSPI controller driver");
+MODULE_AUTHOR("Socionext Inc.");
+MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>");
+MODULE_LICENSE("GPL");
--
2.25.1
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