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Subject[PATCH v8 2/9] spi: rockchip-sfc: add rockchip serial flash controller
Date
From: Chris Morgan <macromorgan@hotmail.com>

Add the rockchip serial flash controller (SFC) driver.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
---

Changes in v8: None
Changes in v7: None
Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None
Changes in v1: None

drivers/spi/Kconfig | 9 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-rockchip-sfc.c | 676 +++++++++++++++++++++++++++++++++
3 files changed, 686 insertions(+)
create mode 100644 drivers/spi/spi-rockchip-sfc.c

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index e71a4c514f7b..d89e5f3c9107 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -658,6 +658,15 @@ config SPI_ROCKCHIP
The main usecase of this controller is to use spi flash as boot
device.

+config SPI_ROCKCHIP_SFC
+ tristate "Rockchip Serial Flash Controller (SFC)"
+ depends on ARCH_ROCKCHIP || COMPILE_TEST
+ depends on HAS_IOMEM && HAS_DMA
+ help
+ This enables support for Rockchip serial flash controller. This
+ is a specialized controller used to access SPI flash on some
+ Rockchip SOCs.
+
config SPI_RB4XX
tristate "Mikrotik RB4XX SPI master"
depends on SPI_MASTER && ATH79
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 13e54c45e9df..699db95c8441 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -95,6 +95,7 @@ obj-$(CONFIG_SPI_QCOM_GENI) += spi-geni-qcom.o
obj-$(CONFIG_SPI_QCOM_QSPI) += spi-qcom-qspi.o
obj-$(CONFIG_SPI_QUP) += spi-qup.o
obj-$(CONFIG_SPI_ROCKCHIP) += spi-rockchip.o
+obj-$(CONFIG_SPI_ROCKCHIP_SFC) += spi-rockchip-sfc.o
obj-$(CONFIG_SPI_RB4XX) += spi-rb4xx.o
obj-$(CONFIG_MACH_REALTEK_RTL) += spi-realtek-rtl.o
obj-$(CONFIG_SPI_RPCIF) += spi-rpc-if.o
diff --git a/drivers/spi/spi-rockchip-sfc.c b/drivers/spi/spi-rockchip-sfc.c
new file mode 100644
index 000000000000..be2557c9af40
--- /dev/null
+++ b/drivers/spi/spi-rockchip-sfc.c
@@ -0,0 +1,676 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Rockchip Serial Flash Controller Driver
+ *
+ * Copyright (c) 2017-2021, Rockchip Inc.
+ * Author: Shawn Lin <shawn.lin@rock-chips.com>
+ * Chris Morgan <macroalpha82@gmail.com>
+ * Jon Lin <Jon.lin@rock-chips.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/dma-mapping.h>
+#include <linux/iopoll.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/spi/spi-mem.h>
+
+/* System control */
+#define SFC_CTRL 0x0
+#define SFC_CTRL_PHASE_SEL_NEGETIVE BIT(1)
+#define SFC_CTRL_CMD_BITS_SHIFT 8
+#define SFC_CTRL_ADDR_BITS_SHIFT 10
+#define SFC_CTRL_DATA_BITS_SHIFT 12
+
+/* Interrupt mask */
+#define SFC_IMR 0x4
+#define SFC_IMR_RX_FULL BIT(0)
+#define SFC_IMR_RX_UFLOW BIT(1)
+#define SFC_IMR_TX_OFLOW BIT(2)
+#define SFC_IMR_TX_EMPTY BIT(3)
+#define SFC_IMR_TRAN_FINISH BIT(4)
+#define SFC_IMR_BUS_ERR BIT(5)
+#define SFC_IMR_NSPI_ERR BIT(6)
+#define SFC_IMR_DMA BIT(7)
+
+/* Interrupt clear */
+#define SFC_ICLR 0x8
+#define SFC_ICLR_RX_FULL BIT(0)
+#define SFC_ICLR_RX_UFLOW BIT(1)
+#define SFC_ICLR_TX_OFLOW BIT(2)
+#define SFC_ICLR_TX_EMPTY BIT(3)
+#define SFC_ICLR_TRAN_FINISH BIT(4)
+#define SFC_ICLR_BUS_ERR BIT(5)
+#define SFC_ICLR_NSPI_ERR BIT(6)
+#define SFC_ICLR_DMA BIT(7)
+
+/* FIFO threshold level */
+#define SFC_FTLR 0xc
+#define SFC_FTLR_TX_SHIFT 0
+#define SFC_FTLR_TX_MASK 0x1f
+#define SFC_FTLR_RX_SHIFT 8
+#define SFC_FTLR_RX_MASK 0x1f
+
+/* Reset FSM and FIFO */
+#define SFC_RCVR 0x10
+#define SFC_RCVR_RESET BIT(0)
+
+/* Enhanced mode */
+#define SFC_AX 0x14
+
+/* Address Bit number */
+#define SFC_ABIT 0x18
+
+/* Interrupt status */
+#define SFC_ISR 0x1c
+#define SFC_ISR_RX_FULL_SHIFT BIT(0)
+#define SFC_ISR_RX_UFLOW_SHIFT BIT(1)
+#define SFC_ISR_TX_OFLOW_SHIFT BIT(2)
+#define SFC_ISR_TX_EMPTY_SHIFT BIT(3)
+#define SFC_ISR_TX_FINISH_SHIFT BIT(4)
+#define SFC_ISR_BUS_ERR_SHIFT BIT(5)
+#define SFC_ISR_NSPI_ERR_SHIFT BIT(6)
+#define SFC_ISR_DMA_SHIFT BIT(7)
+
+/* FIFO status */
+#define SFC_FSR 0x20
+#define SFC_FSR_TX_IS_FULL BIT(0)
+#define SFC_FSR_TX_IS_EMPTY BIT(1)
+#define SFC_FSR_RX_IS_EMPTY BIT(2)
+#define SFC_FSR_RX_IS_FULL BIT(3)
+#define SFC_FSR_TXLV_MASK GENMASK(12, 8)
+#define SFC_FSR_TXLV_SHIFT 8
+#define SFC_FSR_RXLV_MASK GENMASK(20, 16)
+#define SFC_FSR_RXLV_SHIFT 16
+
+/* FSM status */
+#define SFC_SR 0x24
+#define SFC_SR_IS_IDLE 0x0
+#define SFC_SR_IS_BUSY 0x1
+
+/* Raw interrupt status */
+#define SFC_RISR 0x28
+#define SFC_RISR_RX_FULL BIT(0)
+#define SFC_RISR_RX_UNDERFLOW BIT(1)
+#define SFC_RISR_TX_OVERFLOW BIT(2)
+#define SFC_RISR_TX_EMPTY BIT(3)
+#define SFC_RISR_TRAN_FINISH BIT(4)
+#define SFC_RISR_BUS_ERR BIT(5)
+#define SFC_RISR_NSPI_ERR BIT(6)
+#define SFC_RISR_DMA BIT(7)
+
+/* Version */
+#define SFC_VER 0x2C
+#define SFC_VER_3 0x3
+#define SFC_VER_4 0x4
+#define SFC_VER_5 0x5
+
+/* Master trigger */
+#define SFC_DMA_TRIGGER 0x80
+
+/* Src or Dst addr for master */
+#define SFC_DMA_ADDR 0x84
+
+/* Length control register extension 32GB */
+#define SFC_LEN_CTRL 0x88
+#define SFC_LEN_CTRL_TRB_SEL 1
+#define SFC_LEN_EXT 0x8C
+
+/* Command */
+#define SFC_CMD 0x100
+#define SFC_CMD_IDX_SHIFT 0
+#define SFC_CMD_DUMMY_SHIFT 8
+#define SFC_CMD_DIR_SHIFT 12
+#define SFC_CMD_DIR_RD 0
+#define SFC_CMD_DIR_WR 1
+#define SFC_CMD_ADDR_SHIFT 14
+#define SFC_CMD_ADDR_0BITS 0
+#define SFC_CMD_ADDR_24BITS 1
+#define SFC_CMD_ADDR_32BITS 2
+#define SFC_CMD_ADDR_XBITS 3
+#define SFC_CMD_TRAN_BYTES_SHIFT 16
+#define SFC_CMD_CS_SHIFT 30
+
+/* Address */
+#define SFC_ADDR 0x104
+
+/* Data */
+#define SFC_DATA 0x108
+
+/* The controller and documentation reports that it supports up to 4 CS
+ * devices (0-3), however I have only been able to test a single CS (CS 0)
+ * due to the configuration of my device.
+ */
+#define SFC_MAX_CHIPSELECT_NUM 4
+
+/* The SFC can transfer max 16KB - 1 at one time
+ * we set it to 15.5KB here for alignment.
+ */
+#define SFC_MAX_IOSIZE_VER3 (512 * 31)
+
+/* DMA is only enabled for large data transmission */
+#define SFC_DMA_TRANS_THRETHOLD (0x40)
+
+/* Maximum clock values from datasheet suggest keeping clock value under
+ * 150MHz. No minimum or average value is suggested, but the U-boot BSP driver
+ * has a minimum of 10MHz and a default of 80MHz which seems reasonable.
+ */
+#define SFC_MIN_SPEED_HZ (10 * 1000 * 1000)
+#define SFC_DEFAULT_SPEED_HZ (80 * 1000 * 1000)
+#define SFC_MAX_SPEED_HZ (150 * 1000 * 1000)
+
+struct rockchip_sfc {
+ struct device *dev;
+ void __iomem *regbase;
+ struct clk *hclk;
+ struct clk *clk;
+ u32 frequency;
+ /* virtual mapped addr for dma_buffer */
+ void *buffer;
+ dma_addr_t dma_buffer;
+ struct completion cp;
+ bool use_dma;
+ u32 max_iosize;
+ u16 version;
+};
+
+static int rockchip_sfc_reset(struct rockchip_sfc *sfc)
+{
+ int err;
+ u32 status;
+
+ writel_relaxed(SFC_RCVR_RESET, sfc->regbase + SFC_RCVR);
+
+ err = readl_poll_timeout(sfc->regbase + SFC_RCVR, status,
+ !(status & SFC_RCVR_RESET), 20,
+ jiffies_to_usecs(HZ));
+ if (err)
+ dev_err(sfc->dev, "SFC reset never finished\n");
+
+ /* Still need to clear the masked interrupt from RISR */
+ writel_relaxed(0xFFFFFFFF, sfc->regbase + SFC_ICLR);
+
+ dev_dbg(sfc->dev, "reset\n");
+
+ return err;
+}
+
+static u16 rockchip_sfc_get_version(struct rockchip_sfc *sfc)
+{
+ return (u16)(readl(sfc->regbase + SFC_VER) & 0xffff);
+}
+
+static u32 rockchip_sfc_get_max_iosize(struct rockchip_sfc *sfc)
+{
+ return SFC_MAX_IOSIZE_VER3;
+}
+
+static int rockchip_sfc_init(struct rockchip_sfc *sfc)
+{
+ writel(0, sfc->regbase + SFC_CTRL);
+ if (rockchip_sfc_get_version(sfc) >= SFC_VER_4)
+ writel(SFC_LEN_CTRL_TRB_SEL, sfc->regbase + SFC_LEN_CTRL);
+
+ return 0;
+}
+
+static inline int rockchip_sfc_get_fifo_level(struct rockchip_sfc *sfc, int wr)
+{
+ u32 fsr = readl_relaxed(sfc->regbase + SFC_FSR);
+ int level;
+
+ if (wr)
+ level = (fsr & SFC_FSR_TXLV_MASK) >> SFC_FSR_TXLV_SHIFT;
+ else
+ level = (fsr & SFC_FSR_RXLV_MASK) >> SFC_FSR_RXLV_SHIFT;
+
+ return level;
+}
+
+static int rockchip_sfc_wait_fifo_ready(struct rockchip_sfc *sfc, int wr, u32 timeout)
+{
+ unsigned long deadline = jiffies + timeout;
+ int level;
+
+ while (!(level = rockchip_sfc_get_fifo_level(sfc, wr))) {
+ if (time_after_eq(jiffies, deadline)) {
+ dev_warn(sfc->dev, "%s fifo timeout\n", wr ? "write" : "read");
+ return -ETIMEDOUT;
+ }
+ udelay(1);
+ }
+
+ return level;
+}
+
+static void rockchip_sfc_adjust_op_work(struct spi_mem_op *op)
+{
+ if (unlikely(op->dummy.nbytes && !op->addr.nbytes)) {
+ /*
+ * SFC not support output DUMMY cycles right after CMD cycles, so
+ * treat it as ADDR cycles.
+ */
+ op->addr.nbytes = op->dummy.nbytes;
+ op->addr.buswidth = op->dummy.buswidth;
+ op->addr.val = 0xFFFFFFFFF;
+
+ op->dummy.nbytes = 0;
+ }
+}
+
+static int rockchip_sfc_xfer_setup(struct rockchip_sfc *sfc,
+ struct spi_mem *mem,
+ const struct spi_mem_op *op,
+ u32 len)
+{
+ u32 ctrl = 0, cmd = 0;
+
+ /* set CMD */
+ cmd = op->cmd.opcode;
+ ctrl |= ((op->cmd.buswidth >> 1) << SFC_CTRL_CMD_BITS_SHIFT);
+
+ /* set ADDR */
+ if (op->addr.nbytes) {
+ if (op->addr.nbytes == 4) {
+ cmd |= SFC_CMD_ADDR_32BITS << SFC_CMD_ADDR_SHIFT;
+ } else if (op->addr.nbytes == 3) {
+ cmd |= SFC_CMD_ADDR_24BITS << SFC_CMD_ADDR_SHIFT;
+ } else {
+ cmd |= SFC_CMD_ADDR_XBITS << SFC_CMD_ADDR_SHIFT;
+ writel_relaxed(op->addr.nbytes * 8 - 1, sfc->regbase + SFC_ABIT);
+ }
+
+ ctrl |= ((op->addr.buswidth >> 1) << SFC_CTRL_ADDR_BITS_SHIFT);
+ }
+
+ /* set DUMMY */
+ if (op->dummy.nbytes) {
+ if (op->dummy.buswidth == 4)
+ cmd |= op->dummy.nbytes * 2 << SFC_CMD_DUMMY_SHIFT;
+ else if (op->dummy.buswidth == 2)
+ cmd |= op->dummy.nbytes * 4 << SFC_CMD_DUMMY_SHIFT;
+ else
+ cmd |= op->dummy.nbytes * 8 << SFC_CMD_DUMMY_SHIFT;
+ }
+
+ /* set DATA */
+ if (sfc->version >= SFC_VER_4) /* Clear it if no data to transfer */
+ writel(len, sfc->regbase + SFC_LEN_EXT);
+ else
+ cmd |= len << SFC_CMD_TRAN_BYTES_SHIFT;
+ if (len) {
+ if (op->data.dir == SPI_MEM_DATA_OUT)
+ cmd |= SFC_CMD_DIR_WR << SFC_CMD_DIR_SHIFT;
+
+ ctrl |= ((op->data.buswidth >> 1) << SFC_CTRL_DATA_BITS_SHIFT);
+ }
+ if (!len && op->addr.nbytes)
+ cmd |= SFC_CMD_DIR_WR << SFC_CMD_DIR_SHIFT;
+
+ /* set the Controller */
+ ctrl |= SFC_CTRL_PHASE_SEL_NEGETIVE;
+ cmd |= mem->spi->chip_select << SFC_CMD_CS_SHIFT;
+
+ dev_dbg(sfc->dev, "addr.nbytes=%x(x%d) dummy.nbytes=%x(x%d)\n",
+ op->addr.nbytes, op->addr.buswidth,
+ op->dummy.nbytes, op->dummy.buswidth);
+ dev_dbg(sfc->dev, "ctrl=%x cmd=%x addr=%llx len=%x\n",
+ ctrl, cmd, op->addr.val, len);
+
+ writel(ctrl, sfc->regbase + SFC_CTRL);
+ writel(cmd, sfc->regbase + SFC_CMD);
+ if (op->addr.nbytes)
+ writel(op->addr.val, sfc->regbase + SFC_ADDR);
+
+ return 0;
+}
+
+static int rockchip_sfc_write_fifo(struct rockchip_sfc *sfc, const u8 *buf, int len)
+{
+ u8 bytes = len & 0x3;
+ u32 dwords;
+ int tx_level;
+ u32 write_words;
+ u32 tmp = 0;
+
+ dwords = len >> 2;
+ while (dwords) {
+ tx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_WR, HZ);
+ if (tx_level < 0)
+ return tx_level;
+ write_words = min_t(u32, tx_level, dwords);
+ iowrite32_rep(sfc->regbase + SFC_DATA, buf, write_words);
+ buf += write_words << 2;
+ dwords -= write_words;
+ }
+
+ /* write the rest non word aligned bytes */
+ if (bytes) {
+ tx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_WR, HZ);
+ if (tx_level < 0)
+ return tx_level;
+ memcpy(&tmp, buf, bytes);
+ writel(tmp, sfc->regbase + SFC_DATA);
+ }
+
+ return len;
+}
+
+static int rockchip_sfc_read_fifo(struct rockchip_sfc *sfc, u8 *buf, int len)
+{
+ u8 bytes = len & 0x3;
+ u32 dwords;
+ u8 read_words;
+ int rx_level;
+ int tmp;
+
+ /* word aligned access only */
+ dwords = len >> 2;
+ while (dwords) {
+ rx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_RD, HZ);
+ if (rx_level < 0)
+ return rx_level;
+ read_words = min_t(u32, rx_level, dwords);
+ ioread32_rep(sfc->regbase + SFC_DATA, buf, read_words);
+ buf += read_words << 2;
+ dwords -= read_words;
+ }
+
+ /* read the rest non word aligned bytes */
+ if (bytes) {
+ rx_level = rockchip_sfc_wait_fifo_ready(sfc, SFC_CMD_DIR_RD, HZ);
+ if (rx_level < 0)
+ return rx_level;
+ tmp = readl_relaxed(sfc->regbase + SFC_DATA);
+ memcpy(buf, &tmp, bytes);
+ }
+
+ return len;
+}
+
+static int rockchip_sfc_fifo_transfer_dma(struct rockchip_sfc *sfc, dma_addr_t dma_buf, size_t len)
+{
+ u32 reg;
+ int err = 0;
+
+ init_completion(&sfc->cp);
+
+ writel(0xFFFFFFFF, sfc->regbase + SFC_ICLR);
+
+ /* Enable transfer complete interrupt */
+ reg = readl(sfc->regbase + SFC_IMR);
+ reg &= ~SFC_IMR_DMA;
+ writel(reg, sfc->regbase + SFC_IMR);
+ writel((u32)dma_buf, sfc->regbase + SFC_DMA_ADDR);
+ writel(0x1, sfc->regbase + SFC_DMA_TRIGGER);
+
+ /* Wait for the interrupt. */
+ if (!wait_for_completion_timeout(&sfc->cp, msecs_to_jiffies(2000))) {
+ dev_err(sfc->dev, "DMA wait for transfer finish timeout\n");
+ err = -ETIMEDOUT;
+ }
+
+ writel(0xFFFFFFFF, sfc->regbase + SFC_ICLR);
+ /* Disable transfer finish interrupt */
+ reg = readl(sfc->regbase + SFC_IMR);
+ reg |= SFC_IMR_DMA;
+ writel(reg, sfc->regbase + SFC_IMR);
+
+ return len;
+}
+
+static int rockchip_sfc_xfer_data_poll(struct rockchip_sfc *sfc,
+ const struct spi_mem_op *op, u32 len)
+{
+ dev_dbg(sfc->dev, "xfer_poll len=%x\n", len);
+
+ if (op->data.dir == SPI_MEM_DATA_OUT)
+ return rockchip_sfc_write_fifo(sfc, op->data.buf.out, len);
+ else
+ return rockchip_sfc_read_fifo(sfc, op->data.buf.in, len);
+}
+
+static int rockchip_sfc_xfer_data_dma(struct rockchip_sfc *sfc,
+ const struct spi_mem_op *op, u32 len)
+{
+ int ret;
+
+ dev_dbg(sfc->dev, "xfer_dma len=%x\n", len);
+
+ if (op->data.dir == SPI_MEM_DATA_OUT) {
+ memcpy_toio(sfc->buffer, op->data.buf.out, len);
+ ret = rockchip_sfc_fifo_transfer_dma(sfc, sfc->dma_buffer, len);
+ } else {
+ ret = rockchip_sfc_fifo_transfer_dma(sfc, sfc->dma_buffer, len);
+ memcpy_fromio(op->data.buf.in, sfc->buffer, len);
+ }
+
+ return ret;
+}
+
+static int rockchip_sfc_xfer_done(struct rockchip_sfc *sfc, u32 timeout_us)
+{
+ int ret = 0;
+ u32 status;
+
+ ret = readl_poll_timeout(sfc->regbase + SFC_SR, status,
+ !(status & SFC_SR_IS_BUSY),
+ 20, timeout_us);
+ if (ret) {
+ dev_err(sfc->dev, "wait sfc idle timeout\n");
+ rockchip_sfc_reset(sfc);
+
+ ret = -EIO;
+ }
+
+ return ret;
+}
+
+static int rockchip_sfc_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
+{
+ struct rockchip_sfc *sfc = spi_master_get_devdata(mem->spi->master);
+ u32 len = op->data.nbytes;
+ int ret;
+
+ if (unlikely(mem->spi->max_speed_hz != sfc->frequency)) {
+ ret = clk_set_rate(sfc->clk, mem->spi->max_speed_hz);
+ if (ret)
+ return ret;
+ sfc->frequency = mem->spi->max_speed_hz;
+ dev_dbg(sfc->dev, "set_freq=%dHz real_freq=%ldHz\n",
+ sfc->frequency, clk_get_rate(sfc->clk));
+ }
+
+ rockchip_sfc_adjust_op_work((struct spi_mem_op *)op);
+
+ rockchip_sfc_xfer_setup(sfc, mem, op, len);
+ if (len) {
+ if (likely(sfc->use_dma) && !(len & 0x3) && len >= SFC_DMA_TRANS_THRETHOLD)
+ ret = rockchip_sfc_xfer_data_dma(sfc, op, len);
+ else
+ ret = rockchip_sfc_xfer_data_poll(sfc, op, len);
+
+ if (ret != len) {
+ dev_err(sfc->dev, "xfer data failed ret %d dir %d\n", ret, op->data.dir);
+
+ return -EIO;
+ }
+ }
+
+ return rockchip_sfc_xfer_done(sfc, 100000);
+}
+
+static int rockchip_sfc_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)
+{
+ struct rockchip_sfc *sfc = spi_master_get_devdata(mem->spi->master);
+
+ op->data.nbytes = min(op->data.nbytes, sfc->max_iosize);
+
+ return 0;
+}
+
+static const struct spi_controller_mem_ops rockchip_sfc_mem_ops = {
+ .exec_op = rockchip_sfc_exec_mem_op,
+ .adjust_op_size = rockchip_sfc_adjust_op_size,
+};
+
+static irqreturn_t rockchip_sfc_irq_handler(int irq, void *dev_id)
+{
+ struct rockchip_sfc *sfc = dev_id;
+ u32 reg;
+
+ reg = readl(sfc->regbase + SFC_RISR);
+
+ /* Clear interrupt */
+ writel_relaxed(reg, sfc->regbase + SFC_ICLR);
+
+ if (reg & SFC_RISR_DMA)
+ complete(&sfc->cp);
+
+ return IRQ_HANDLED;
+}
+
+static int rockchip_sfc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct spi_master *master;
+ struct resource *res;
+ struct rockchip_sfc *sfc;
+ int ret;
+
+ master = devm_spi_alloc_master(&pdev->dev, sizeof(*sfc));
+ if (!master)
+ return -ENOMEM;
+
+ master->mem_ops = &rockchip_sfc_mem_ops;
+ master->dev.of_node = pdev->dev.of_node;
+ master->mode_bits = SPI_TX_QUAD | SPI_TX_DUAL | SPI_RX_QUAD | SPI_RX_DUAL;
+ master->min_speed_hz = SFC_MIN_SPEED_HZ;
+ master->max_speed_hz = SFC_MAX_SPEED_HZ;
+ master->num_chipselect = SFC_MAX_CHIPSELECT_NUM;
+
+ sfc = spi_master_get_devdata(master);
+ sfc->dev = dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ sfc->regbase = devm_ioremap_resource(dev, res);
+ if (IS_ERR(sfc->regbase))
+ return PTR_ERR(sfc->regbase);
+
+ sfc->clk = devm_clk_get(&pdev->dev, "clk_sfc");
+ if (IS_ERR(sfc->clk)) {
+ dev_err(&pdev->dev, "Failed to get sfc interface clk\n");
+ return PTR_ERR(sfc->clk);
+ }
+
+ sfc->hclk = devm_clk_get(&pdev->dev, "hclk_sfc");
+ if (IS_ERR(sfc->hclk)) {
+ dev_err(&pdev->dev, "Failed to get sfc ahb clk\n");
+ return PTR_ERR(sfc->hclk);
+ }
+
+ sfc->use_dma = !of_property_read_bool(sfc->dev->of_node,
+ "rockchip,sfc-no-dma");
+
+ if (sfc->use_dma) {
+ ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+ if (ret) {
+ dev_warn(dev, "Unable to set dma mask\n");
+ return ret;
+ }
+
+ sfc->buffer = dmam_alloc_coherent(dev, SFC_MAX_IOSIZE_VER3,
+ &sfc->dma_buffer,
+ GFP_KERNEL);
+ if (!sfc->buffer)
+ return -ENOMEM;
+ }
+
+ ret = clk_prepare_enable(sfc->hclk);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to enable ahb clk\n");
+ goto err_hclk;
+ }
+
+ ret = clk_prepare_enable(sfc->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to enable interface clk\n");
+ goto err_clk;
+ }
+
+ /* Find the irq */
+ ret = platform_get_irq(pdev, 0);
+ if (ret < 0) {
+ dev_err(dev, "Failed to get the irq\n");
+ goto err_irq;
+ }
+
+ ret = devm_request_irq(dev, ret, rockchip_sfc_irq_handler,
+ 0, pdev->name, sfc);
+ if (ret) {
+ dev_err(dev, "Failed to request irq\n");
+
+ return ret;
+ }
+
+ ret = rockchip_sfc_init(sfc);
+ if (ret)
+ goto err_irq;
+
+ sfc->max_iosize = rockchip_sfc_get_max_iosize(sfc);
+ sfc->version = rockchip_sfc_get_version(sfc);
+
+ ret = spi_register_master(master);
+ if (ret)
+ goto err_irq;
+
+ return 0;
+
+err_irq:
+ clk_disable_unprepare(sfc->clk);
+err_clk:
+ clk_disable_unprepare(sfc->hclk);
+err_hclk:
+ return ret;
+}
+
+static int rockchip_sfc_remove(struct platform_device *pdev)
+{
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct rockchip_sfc *sfc = platform_get_drvdata(pdev);
+
+ spi_unregister_master(master);
+
+ clk_disable_unprepare(sfc->clk);
+ clk_disable_unprepare(sfc->hclk);
+
+ return 0;
+}
+
+static const struct of_device_id rockchip_sfc_dt_ids[] = {
+ { .compatible = "rockchip,sfc"},
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rockchip_sfc_dt_ids);
+
+static struct platform_driver rockchip_sfc_driver = {
+ .driver = {
+ .name = "rockchip-sfc",
+ .of_match_table = rockchip_sfc_dt_ids,
+ },
+ .probe = rockchip_sfc_probe,
+ .remove = rockchip_sfc_remove,
+};
+module_platform_driver(rockchip_sfc_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Rockchip Serial Flash Controller Driver");
+MODULE_AUTHOR("Shawn Lin <shawn.lin@rock-chips.com>");
+MODULE_AUTHOR("Chris Morgan <macromorgan@hotmail.com>");
+MODULE_AUTHOR("Jon Lin <Jon.lin@rock-chips.com>");
--
2.17.1


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