[PATCH v6 1/5] spi: rockchip_sfc: add support for Rockchip SFC

Chris Morgan macromorgan at hotmail.com
Tue Jul 6 19:18:54 CEST 2021


On Wed, Jun 30, 2021 at 09:31:31PM +0800, Jon Lin wrote:
> From: Chris Morgan <macromorgan at hotmail.com>
> 
> This patch adds support for the Rockchip serial flash controller
> found on the PX30 SoC. It should work for versions 3-5 of the SFC
> IP, however I am only able to test it on v3.
> 
> This is adapted from the WIP SPI-MEM driver for the SFC on mainline
> Linux. Note that the main difference between this and earlier versions
> of the driver is that this one does not support DMA. In testing
> the performance difference (performing a dual mode read on a 128Mb
> chip) is negligible. DMA, if used, must also be disabled in SPL
> mode when using A-TF anyway.
> 
> Signed-off-by: Chris Morgan <macromorgan at hotmail.com>
> Signed-off-by: Jon Lin <jon.lin at rock-chips.com>
> ---
> 
> Changes in v6:
> - Fix dma transfer logic
> - Fix the error of the way to wait for dma transfer finished status
> 
> Changes in v5:
> - Support dma transfer
> - Add CONFIG_IS_ENABLED(CLK) limitation
> - Support spinand devices
> - Support SFC ver4 ver5
> - Using "rockchip, sfc" as compatible id
> - Get clock from the index to compatible with those case which's
>   clock-names is not parsed
> 
> Changes in v4:
> - None
> 
> Changes in v3:
> - Added "rockchip_sfc_adjust_op_work()" function from proposed Linux
>   driver to fix potential issue on hardware. Note I never noticed
>   this issue while testing, so I cannot test if it fixed any specific
>   issue for me.
> - Updated of-compatible string back to "rockchip,sfc" to match what
>   is currently proposed for upstream driver. The hardware itself
>   has multiple versions but a register is present in the hardware that
>   is read by the driver to set version specific functionality.
> - Updated px30.dtsi and rk3266-odroid-go2.dts device-trees so that
>   sfc nodes match what is in upstream.
> 
> Changes in v2:
> - Resending due to glitch with patch file truncating final two lines
>   on patch 1/5 and incorrect patch version number on patch 5/5.
> 
> Changes in v1:
> - Reworked code to utilize spi-mem framework, and based it closely
>   off of work in progress code for mainline Linux.
> - Removed DMA, as it didn't offer much performance benefit for
>   booting (in my test cases), added complexity to the code, and
>   interfered with A-TF.
> - Updated the names of the bindings to match the work in progress
>   Linux code.
> - Moved alias to u-boot specific device-tree for Odroid Go Advance.
>   Alias is updated with the spi0 node pointing to the SFC to
>   help the sf command as well as facilitate booting from the SFC.
> - Note 2 below no longer applies, as rebasing this off of upstream
>   code should allow the device to work for NAND, and by utilizing
>   the spi-mem framework it no longer has to extract the parameters
> 
>  drivers/spi/Kconfig        |   8 +
>  drivers/spi/Makefile       |   1 +
>  drivers/spi/rockchip_sfc.c | 643 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 652 insertions(+)
>  create mode 100644 drivers/spi/rockchip_sfc.c
> 
> diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
> index 1494c91763..bef36f2931 100644
> --- a/drivers/spi/Kconfig
> +++ b/drivers/spi/Kconfig
> @@ -312,6 +312,14 @@ config RENESAS_RPC_SPI
>  	  on Renesas RCar Gen3 SoCs. This uses driver model and requires a
>  	  device tree binding to operate.
>  
> +config ROCKCHIP_SFC
> +	bool "Rockchip SFC Driver"
> +	help
> +	  Enable the Rockchip SFC Driver for SPI NOR flash. This device is
> +	  a limited purpose SPI controller for driving NOR flash on certain
> +	  Rockchip SoCs. This uses driver model and requires a device tree
> +	  binding to operate.
> +
>  config ROCKCHIP_SPI
>  	bool "Rockchip SPI driver"
>  	help
> diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
> index cfe4fae1d4..f02e84b5f1 100644
> --- a/drivers/spi/Makefile
> +++ b/drivers/spi/Makefile
> @@ -52,6 +52,7 @@ obj-$(CONFIG_PIC32_SPI) += pic32_spi.o
>  obj-$(CONFIG_PL022_SPI) += pl022_spi.o
>  obj-$(CONFIG_SPI_QUP) += spi-qup.o
>  obj-$(CONFIG_RENESAS_RPC_SPI) += renesas_rpc_spi.o
> +obj-$(CONFIG_ROCKCHIP_SFC) += rockchip_sfc.o
>  obj-$(CONFIG_ROCKCHIP_SPI) += rk_spi.o
>  obj-$(CONFIG_SANDBOX_SPI) += sandbox_spi.o
>  obj-$(CONFIG_SPI_SIFIVE) += spi-sifive.o
> diff --git a/drivers/spi/rockchip_sfc.c b/drivers/spi/rockchip_sfc.c
> new file mode 100644
> index 0000000000..2d86f136f2
> --- /dev/null
> +++ b/drivers/spi/rockchip_sfc.c
> @@ -0,0 +1,643 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Rockchip Serial Flash Controller Driver
> + *
> + * Copyright (c) 2017-2021, Rockchip Inc.
> + * Author: Shawn Lin <shawn.lin at rock-chips.com>
> + *	   Chris Morgan <macromorgan at hotmail.com>
> + *	   Jon Lin <Jon.lin at rock-chips.com>
> + */
> +
> +#include <asm/io.h>
> +#include <bouncebuf.h>
> +#include <clk.h>
> +#include <dm.h>
> +#include <linux/bitops.h>
> +#include <linux/delay.h>
> +#include <linux/iopoll.h>
> +#include <spi.h>
> +#include <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
> +
> +/* Delay line controller resiter */
> +#define SFC_DLL_CTRL0			0x3C
> +#define SFC_DLL_CTRL0_SCLK_SMP_DLL	BIT(15)
> +#define SFC_DLL_CTRL0_DLL_MAX_VER4	0xFFU
> +#define SFC_DLL_CTRL0_DLL_MAX_VER5	0x1FFU
> +
> +/* 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)
> +
> +#define SFC_MAX_IOSIZE_VER4		(0xFFFFFFFFU)
> +
> +/* 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 {
> +	void __iomem *regbase;
> +	struct clk hclk;
> +	struct clk clk;
> +	u32 max_freq;
> +	u32 speed;
> +	bool use_dma;
> +	u32 max_iosize;
> +	u16 version;
> +};
> +
> +static int rockchip_sfc_reset(struct rockchip_sfc *sfc)
> +{
> +	int err;
> +	u32 status;
> +
> +	writel(SFC_RCVR_RESET, sfc->regbase + SFC_RCVR);
> +
> +	err = readl_poll_timeout(sfc->regbase + SFC_RCVR, status,
> +				 !(status & SFC_RCVR_RESET),
> +				 1000000);
> +	if (err)
> +		printf("SFC reset never finished\n");
> +
> +	/* Still need to clear the masked interrupt from RISR */
> +	writel(0xFFFFFFFF, sfc->regbase + SFC_ICLR);
> +
> +	debug("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)
> +{
> +	if (rockchip_sfc_get_version(sfc) >= SFC_VER_4)
> +		return SFC_MAX_IOSIZE_VER4;
> +
> +	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 int rockchip_sfc_ofdata_to_platdata(struct udevice *bus)
> +{
> +	struct rockchip_sfc *sfc = dev_get_plat(bus);
> +
> +	sfc->regbase = dev_read_addr_ptr(bus);
> +
> +#if CONFIG_IS_ENABLED(CLK)
> +	int ret;
> +
> +	ret = clk_get_by_index(bus, 0, &sfc->clk);
> +	if (ret < 0) {
> +		printf("Could not get clock for %s: %d\n", bus->name, ret);
> +		return ret;
> +	}
> +
> +	ret = clk_get_by_index(bus, 1, &sfc->hclk);
> +	if (ret < 0) {
> +		printf("Could not get ahb clock for %s: %d\n", bus->name, ret);
> +		return ret;
> +	}
> +#endif
> +
> +	return 0;
> +}
> +
> +static int rockchip_sfc_probe(struct udevice *bus)
> +{
> +	struct rockchip_sfc *sfc = dev_get_plat(bus);
> +	int ret;
> +
> +#if CONFIG_IS_ENABLED(CLK)
> +	ret = clk_enable(&sfc->hclk);
> +	if (ret)
> +		debug("Enable ahb clock fail %s: %d\n", bus->name, ret);

I'm getting an enable ahb clock fail when I try to use this driver
(Odroid Go Advance, same as for Linux).

> +
> +	ret = clk_enable(&sfc->clk);
> +	if (ret)
> +		debug("Enable clock fail for %s: %d\n", bus->name, ret);

Also get a clock fail error when I try to use this driver.

> +
> +	ret = clk_set_rate(&sfc->clk, SFC_DEFAULT_SPEED_HZ);
> +	if (ret)
> +		debug("Could not set sfc clock for %s: %d\n", bus->name, ret);
> +#endif
> +
> +	ret = rockchip_sfc_init(sfc);
> +	if (ret)
> +		goto err_init;
> +
> +	sfc->use_dma = true;

We'll need a way to disable DMA, otherwise this driver cannot be used
in SPL mode prior to the load of A-TF (just like the rk_sdmmc driver
DMA causes issues with A-TF in SPL mode).

> +	sfc->max_iosize = rockchip_sfc_get_max_iosize(sfc);
> +	sfc->version = rockchip_sfc_get_version(sfc);
> +	sfc->speed = SFC_DEFAULT_SPEED_HZ;
> +
> +	return 0;
> +
> +err_init:
> +#if CONFIG_IS_ENABLED(CLK)
> +	clk_disable(&sfc->clk);
> +	clk_disable(&sfc->hclk);
> +#endif
> +
> +	return ret;
> +}
> +
> +static inline int rockchip_sfc_get_fifo_level(struct rockchip_sfc *sfc, int wr)
> +{
> +	u32 fsr = readl(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 tbase = get_timer(0);
> +	int level;
> +
> +	while (!(level = rockchip_sfc_get_fifo_level(sfc, wr))) {
> +		if (get_timer(tbase) > timeout) {
> +			debug("%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_wait_for_dma_finished(struct rockchip_sfc *sfc, int timeout)
> +{
> +	unsigned long tbase;
> +
> +	/* Wait for the DMA interrupt status */
> +	tbase = get_timer(0);
> +	while (!(readl(sfc->regbase + SFC_RISR) & SFC_RISR_DMA)) {
> +		if (get_timer(tbase) > timeout) {
> +			printf("dma timeout\n");
> +			rockchip_sfc_reset(sfc);
> +
> +			return -ETIMEDOUT;
> +		}
> +
> +		udelay(1);
> +	}
> +
> +	writel(0xFFFFFFFF, sfc->regbase + SFC_ICLR);
> +
> +	return 0;
> +}
> +
> +static int rockchip_sfc_xfer_setup(struct rockchip_sfc *sfc,
> +				   struct spi_slave *mem,
> +				   const struct spi_mem_op *op,
> +				   u32 len)
> +{
> +	struct dm_spi_slave_plat *plat = dev_get_parent_plat(mem->dev);
> +	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(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 |= plat->cs << SFC_CMD_CS_SHIFT;
> +
> +	debug("addr.nbytes=%x(x%d) dummy.nbytes=%x(x%d)\n",
> +	      op->addr.nbytes, op->addr.buswidth,
> +	      op->dummy.nbytes, op->dummy.buswidth);
> +	debug("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, 1000);
> +		if (tx_level < 0)
> +			return tx_level;
> +		write_words = min_t(u32, tx_level, dwords);
> +		writesl(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, 1000);
> +		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, 1000);
> +		if (rx_level < 0)
> +			return rx_level;
> +		read_words = min_t(u32, rx_level, dwords);
> +		readsl(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, 1000);
> +		if (rx_level < 0)
> +			return rx_level;
> +		tmp = readl(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)
> +{
> +	writel(0xFFFFFFFF, sfc->regbase + SFC_ICLR);
> +	writel((u32)dma_buf, sfc->regbase + SFC_DMA_ADDR);
> +	writel(0x1, sfc->regbase + SFC_DMA_TRIGGER);
> +
> +	return len;
> +}
> +
> +static int rockchip_sfc_xfer_data_poll(struct rockchip_sfc *sfc,
> +				       const struct spi_mem_op *op, u32 len)
> +{
> +	debug("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)
> +{
> +	struct bounce_buffer bb;
> +	unsigned int bb_flags;
> +	void *dma_buf;
> +	int ret;
> +
> +	debug("xfer_dma len=%x\n", len);
> +
> +	if (op->data.dir == SPI_MEM_DATA_OUT) {
> +		dma_buf = (void *)op->data.buf.out;
> +		bb_flags = GEN_BB_READ;
> +	} else {
> +		dma_buf = (void *)op->data.buf.in;
> +		bb_flags = GEN_BB_WRITE;
> +	}
> +
> +	ret = bounce_buffer_start(&bb, dma_buf, len, bb_flags);
> +	if (ret)
> +		return ret;
> +
> +	ret = rockchip_sfc_fifo_transfer_dma(sfc, (dma_addr_t)bb.bounce_buffer, len);
> +	rockchip_sfc_wait_for_dma_finished(sfc, len * 10);
> +	bounce_buffer_stop(&bb);
> +
> +	return ret;
> +}
> +
> +static int rockchip_sfc_xfer_done(struct rockchip_sfc *sfc, u32 timeout_us)
> +{
> +	unsigned long tbase = get_timer(0);
> +	int ret = 0;
> +	u32 timeout = timeout_us;
> +
> +	while (readl(sfc->regbase + SFC_SR) & SFC_SR_IS_BUSY) {
> +		if (get_timer(tbase) > timeout) {
> +			printf("wait sfc idle timeout\n");
> +			rockchip_sfc_reset(sfc);
> +
> +			return -ETIMEDOUT;
> +		}
> +
> +		udelay(1);
> +	}
> +
> +	return ret;
> +}
> +
> +static int rockchip_sfc_exec_op(struct spi_slave *mem,
> +				const struct spi_mem_op *op)
> +{
> +	struct rockchip_sfc *sfc = dev_get_plat(mem->dev->parent);
> +	u32 len = min_t(u32, op->data.nbytes, sfc->max_iosize);
> +	int ret;
> +
> +#if CONFIG_IS_ENABLED(CLK)
> +	if (unlikely(mem->max_hz != sfc->speed)) {
> +		ret = clk_set_rate(&sfc->clk, clamp(mem->max_hz, (uint)SFC_MIN_SPEED_HZ,
> +						    (uint)SFC_MAX_SPEED_HZ));
> +		if (ret < 0) {
> +			printf("set_freq=%dHz fail, check if it's the cru support level\n",
> +			       mem->max_hz);
> +			return ret;
> +		}
> +
> +		sfc->max_freq = mem->max_hz;
> +		sfc->speed = mem->max_hz;
> +		debug("set_freq=%dHz real_freq=%dHz\n", sfc->max_freq, sfc->speed);
> +	}
> +#endif
> +
> +	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) {
> +			printf("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_slave *mem, struct spi_mem_op *op)
> +{
> +	struct rockchip_sfc *sfc = dev_get_plat(mem->dev->parent);
> +
> +	op->data.nbytes = min(op->data.nbytes, sfc->max_iosize);
> +	return 0;
> +}
> +
> +static int rockchip_sfc_set_speed(struct udevice *bus, uint speed)
> +{
> +	/* We set up speed later for each transmission.
> +	 */
> +	return 0;
> +}
> +
> +static int rockchip_sfc_set_mode(struct udevice *bus, uint mode)
> +{
> +	return 0;
> +}
> +
> +static const struct spi_controller_mem_ops rockchip_sfc_mem_ops = {
> +	.adjust_op_size	= rockchip_sfc_adjust_op_size,
> +	.exec_op	= rockchip_sfc_exec_op,
> +};
> +
> +static const struct dm_spi_ops rockchip_sfc_ops = {
> +	.mem_ops	= &rockchip_sfc_mem_ops,
> +	.set_speed	= rockchip_sfc_set_speed,
> +	.set_mode	= rockchip_sfc_set_mode,
> +};
> +
> +static const struct udevice_id rockchip_sfc_ids[] = {
> +	{ .compatible = "rockchip,sfc"},
> +	{},
> +};
> +
> +U_BOOT_DRIVER(rockchip_sfc_driver) = {
> +	.name   = "rockchip_sfc",
> +	.id     = UCLASS_SPI,
> +	.of_match = rockchip_sfc_ids,
> +	.ops    = &rockchip_sfc_ops,
> +	.of_to_plat = rockchip_sfc_ofdata_to_platdata,
> +	.plat_auto = sizeof(struct rockchip_sfc),
> +	.probe  = rockchip_sfc_probe,
> +};
> -- 
> 2.17.1
> 
> 
> 


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