Message-ID: <20160217171308.GB16812@shlinux2>
Date:	Thu, 18 Feb 2016 01:13:08 +0800
From:	Han Xu <xhnjupt@...il.com>
To:	Yuan Yao <yao.yuan@...escale.com>
Cc:	dwmw2@...radead.org, computersforpeace@...il.com,
	han.xu@...escale.com, robh@...nel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
	yao.yuan@....com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 1/7] mtd: spi-nor: fsl-quadspi: add big-endian support

On Tue, Jan 26, 2016 at 03:23:55PM +0800, Yuan Yao wrote:
> Add R/W functions for big- or little-endian registers:
> The qSPI controller's endian is independent of the CPU core's endian.
> So far, the qSPI have two versions for big-endian and little-endian.
> 
> Signed-off-by: Yuan Yao <yao.yuan@....com>
> Acked-by: Han xu <han.xu@...escale.com>
> ---
> Changed in v4:
> No changes.
> 
> Changed in v3:
> Update my email to <yao.yuan@....com>
> 
> Changed in v2:
> Rebase to the lastest code.
> ---
>  drivers/mtd/spi-nor/fsl-quadspi.c | 157 +++++++++++++++++++++++---------------
>  1 file changed, 97 insertions(+), 60 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
> index 54640f1..04e8a93 100644
> --- a/drivers/mtd/spi-nor/fsl-quadspi.c
> +++ b/drivers/mtd/spi-nor/fsl-quadspi.c
> @@ -275,6 +275,7 @@ struct fsl_qspi {
>  	u32 clk_rate;
>  	unsigned int chip_base_addr; /* We may support two chips. */
>  	bool has_second_chip;
> +	bool big_endian;
>  	struct mutex lock;
>  	struct pm_qos_request pm_qos_req;
>  };
> @@ -300,6 +301,28 @@ static inline int needs_wakeup_wait_mode(struct fsl_qspi *q)
>  }
>  
>  /*
> + * R/W functions for big- or little-endian registers:
> + * The qSPI controller's endian is independent of the CPU core's endian.
> + * So far, although the CPU core is little-endian but the qSPI have two
> + * versions for big-endian and little-endian.
> + */
> +static void qspi_writel(struct fsl_qspi *q, u32 val, void __iomem *addr)
> +{
> +	if (q->big_endian)
> +		iowrite32be(val, addr);
> +	else
> +		iowrite32(val, addr);
> +}
> +
> +static u32 qspi_readl(struct fsl_qspi *q, void __iomem *addr)
> +{
> +	if (q->big_endian)
> +		return ioread32be(addr);
> +	else
> +		return ioread32(addr);
> +}
> +
> +/*
>   * An IC bug makes us to re-arrange the 32-bit data.
>   * The following chips, such as IMX6SLX, have fixed this bug.
>   */
> @@ -310,14 +333,14 @@ static inline u32 fsl_qspi_endian_xchg(struct fsl_qspi *q, u32 a)
>  
>  static inline void fsl_qspi_unlock_lut(struct fsl_qspi *q)
>  {
> -	writel(QUADSPI_LUTKEY_VALUE, q->iobase + QUADSPI_LUTKEY);
> -	writel(QUADSPI_LCKER_UNLOCK, q->iobase + QUADSPI_LCKCR);
> +	qspi_writel(q, QUADSPI_LUTKEY_VALUE, q->iobase + QUADSPI_LUTKEY);
> +	qspi_writel(q, QUADSPI_LCKER_UNLOCK, q->iobase + QUADSPI_LCKCR);
>  }
>  
>  static inline void fsl_qspi_lock_lut(struct fsl_qspi *q)
>  {
> -	writel(QUADSPI_LUTKEY_VALUE, q->iobase + QUADSPI_LUTKEY);
> -	writel(QUADSPI_LCKER_LOCK, q->iobase + QUADSPI_LCKCR);
> +	qspi_writel(q, QUADSPI_LUTKEY_VALUE, q->iobase + QUADSPI_LUTKEY);
> +	qspi_writel(q, QUADSPI_LCKER_LOCK, q->iobase + QUADSPI_LCKCR);
>  }
>  
>  static irqreturn_t fsl_qspi_irq_handler(int irq, void *dev_id)
> @@ -326,8 +349,8 @@ static irqreturn_t fsl_qspi_irq_handler(int irq, void *dev_id)
>  	u32 reg;
>  
>  	/* clear interrupt */
> -	reg = readl(q->iobase + QUADSPI_FR);
> -	writel(reg, q->iobase + QUADSPI_FR);
> +	reg = qspi_readl(q, q->iobase + QUADSPI_FR);
> +	qspi_writel(q, reg, q->iobase + QUADSPI_FR);
>  
>  	if (reg & QUADSPI_FR_TFF_MASK)
>  		complete(&q->c);
> @@ -348,7 +371,7 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
>  
>  	/* Clear all the LUT table */
>  	for (i = 0; i < QUADSPI_LUT_NUM; i++)
> -		writel(0, base + QUADSPI_LUT_BASE + i * 4);
> +		qspi_writel(q, 0, base + QUADSPI_LUT_BASE + i * 4);
>  
>  	/* Quad Read */
>  	lut_base = SEQID_QUAD_READ * 4;
> @@ -364,14 +387,15 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
>  		dummy = 8;
>  	}
>  
> -	writel(LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
> +	qspi_writel(q, LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
>  			base + QUADSPI_LUT(lut_base));
> -	writel(LUT0(DUMMY, PAD1, dummy) | LUT1(FSL_READ, PAD4, rxfifo),
> +	qspi_writel(q, LUT0(DUMMY, PAD1, dummy) | LUT1(FSL_READ, PAD4, rxfifo),
>  			base + QUADSPI_LUT(lut_base + 1));
>  
>  	/* Write enable */
>  	lut_base = SEQID_WREN * 4;
> -	writel(LUT0(CMD, PAD1, SPINOR_OP_WREN), base + QUADSPI_LUT(lut_base));
> +	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_WREN),
> +			base + QUADSPI_LUT(lut_base));
>  
>  	/* Page Program */
>  	lut_base = SEQID_PP * 4;
> @@ -385,13 +409,15 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
>  		addrlen = ADDR32BIT;
>  	}
>  
> -	writel(LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
> +	qspi_writel(q, LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
>  			base + QUADSPI_LUT(lut_base));
> -	writel(LUT0(FSL_WRITE, PAD1, 0), base + QUADSPI_LUT(lut_base + 1));
> +	qspi_writel(q, LUT0(FSL_WRITE, PAD1, 0),
> +			base + QUADSPI_LUT(lut_base + 1));
>  
>  	/* Read Status */
>  	lut_base = SEQID_RDSR * 4;
> -	writel(LUT0(CMD, PAD1, SPINOR_OP_RDSR) | LUT1(FSL_READ, PAD1, 0x1),
> +	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_RDSR) |
> +			LUT1(FSL_READ, PAD1, 0x1),
>  			base + QUADSPI_LUT(lut_base));
>  
>  	/* Erase a sector */
> @@ -400,40 +426,46 @@ static void fsl_qspi_init_lut(struct fsl_qspi *q)
>  	cmd = q->nor[0].erase_opcode;
>  	addrlen = q->nor_size <= SZ_16M ? ADDR24BIT : ADDR32BIT;
>  
> -	writel(LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
> +	qspi_writel(q, LUT0(CMD, PAD1, cmd) | LUT1(ADDR, PAD1, addrlen),
>  			base + QUADSPI_LUT(lut_base));
>  
>  	/* Erase the whole chip */
>  	lut_base = SEQID_CHIP_ERASE * 4;
> -	writel(LUT0(CMD, PAD1, SPINOR_OP_CHIP_ERASE),
> +	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_CHIP_ERASE),
>  			base + QUADSPI_LUT(lut_base));
>  
>  	/* READ ID */
>  	lut_base = SEQID_RDID * 4;
> -	writel(LUT0(CMD, PAD1, SPINOR_OP_RDID) | LUT1(FSL_READ, PAD1, 0x8),
> +	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_RDID) |
> +			LUT1(FSL_READ, PAD1, 0x8),
>  			base + QUADSPI_LUT(lut_base));
>  
>  	/* Write Register */
>  	lut_base = SEQID_WRSR * 4;
> -	writel(LUT0(CMD, PAD1, SPINOR_OP_WRSR) | LUT1(FSL_WRITE, PAD1, 0x2),
> +	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_WRSR) |
> +			LUT1(FSL_WRITE, PAD1, 0x2),
>  			base + QUADSPI_LUT(lut_base));
>  
>  	/* Read Configuration Register */
>  	lut_base = SEQID_RDCR * 4;
> -	writel(LUT0(CMD, PAD1, SPINOR_OP_RDCR) | LUT1(FSL_READ, PAD1, 0x1),
> +	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_RDCR) |
> +			LUT1(FSL_READ, PAD1, 0x1),
>  			base + QUADSPI_LUT(lut_base));
>  
>  	/* Write disable */
>  	lut_base = SEQID_WRDI * 4;
> -	writel(LUT0(CMD, PAD1, SPINOR_OP_WRDI), base + QUADSPI_LUT(lut_base));
> +	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_WRDI),
> +			base + QUADSPI_LUT(lut_base));
>  
>  	/* Enter 4 Byte Mode (Micron) */
>  	lut_base = SEQID_EN4B * 4;
> -	writel(LUT0(CMD, PAD1, SPINOR_OP_EN4B), base + QUADSPI_LUT(lut_base));
> +	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_EN4B),
> +			base + QUADSPI_LUT(lut_base));
>  
>  	/* Enter 4 Byte Mode (Spansion) */
>  	lut_base = SEQID_BRWR * 4;
> -	writel(LUT0(CMD, PAD1, SPINOR_OP_BRWR), base + QUADSPI_LUT(lut_base));
> +	qspi_writel(q, LUT0(CMD, PAD1, SPINOR_OP_BRWR),
> +			base + QUADSPI_LUT(lut_base));
>  
>  	fsl_qspi_lock_lut(q);
>  }
> @@ -488,15 +520,16 @@ fsl_qspi_runcmd(struct fsl_qspi *q, u8 cmd, unsigned int addr, int len)
>  			q->chip_base_addr, addr, len, cmd);
>  
>  	/* save the reg */
> -	reg = readl(base + QUADSPI_MCR);
> +	reg = qspi_readl(q, base + QUADSPI_MCR);
>  
> -	writel(q->memmap_phy + q->chip_base_addr + addr, base + QUADSPI_SFAR);
> -	writel(QUADSPI_RBCT_WMRK_MASK | QUADSPI_RBCT_RXBRD_USEIPS,
> +	qspi_writel(q, q->memmap_phy + q->chip_base_addr + addr,
> +			base + QUADSPI_SFAR);
> +	qspi_writel(q, QUADSPI_RBCT_WMRK_MASK | QUADSPI_RBCT_RXBRD_USEIPS,
>  			base + QUADSPI_RBCT);
> -	writel(reg | QUADSPI_MCR_CLR_RXF_MASK, base + QUADSPI_MCR);
> +	qspi_writel(q, reg | QUADSPI_MCR_CLR_RXF_MASK, base + QUADSPI_MCR);
>  
>  	do {
> -		reg2 = readl(base + QUADSPI_SR);
> +		reg2 = qspi_readl(q, base + QUADSPI_SR);
>  		if (reg2 & (QUADSPI_SR_IP_ACC_MASK | QUADSPI_SR_AHB_ACC_MASK)) {
>  			udelay(1);
>  			dev_dbg(q->dev, "The controller is busy, 0x%x\n", reg2);
> @@ -507,21 +540,22 @@ fsl_qspi_runcmd(struct fsl_qspi *q, u8 cmd, unsigned int addr, int len)
>  
>  	/* trigger the LUT now */
>  	seqid = fsl_qspi_get_seqid(q, cmd);
> -	writel((seqid << QUADSPI_IPCR_SEQID_SHIFT) | len, base + QUADSPI_IPCR);
> +	qspi_writel(q, (seqid << QUADSPI_IPCR_SEQID_SHIFT) | len,
> +			base + QUADSPI_IPCR);
>  
>  	/* Wait for the interrupt. */
>  	if (!wait_for_completion_timeout(&q->c, msecs_to_jiffies(1000))) {
>  		dev_err(q->dev,
>  			"cmd 0x%.2x timeout, addr@...x, FR:0x%.8x, SR:0x%.8x\n",
> -			cmd, addr, readl(base + QUADSPI_FR),
> -			readl(base + QUADSPI_SR));
> +			cmd, addr, qspi_readl(q, base + QUADSPI_FR),
> +			qspi_readl(q, base + QUADSPI_SR));
>  		err = -ETIMEDOUT;
>  	} else {
>  		err = 0;
>  	}
>  
>  	/* restore the MCR */
> -	writel(reg, base + QUADSPI_MCR);
> +	qspi_writel(q, reg, base + QUADSPI_MCR);
>  
>  	return err;
>  }
> @@ -533,7 +567,7 @@ static void fsl_qspi_read_data(struct fsl_qspi *q, int len, u8 *rxbuf)
>  	int i = 0;
>  
>  	while (len > 0) {
> -		tmp = readl(q->iobase + QUADSPI_RBDR + i * 4);
> +		tmp = qspi_readl(q, q->iobase + QUADSPI_RBDR + i * 4);
>  		tmp = fsl_qspi_endian_xchg(q, tmp);
>  		dev_dbg(q->dev, "chip addr:0x%.8x, rcv:0x%.8x\n",
>  				q->chip_base_addr, tmp);
> @@ -561,9 +595,9 @@ static inline void fsl_qspi_invalid(struct fsl_qspi *q)
>  {
>  	u32 reg;
>  
> -	reg = readl(q->iobase + QUADSPI_MCR);
> +	reg = qspi_readl(q, q->iobase + QUADSPI_MCR);
>  	reg |= QUADSPI_MCR_SWRSTHD_MASK | QUADSPI_MCR_SWRSTSD_MASK;
> -	writel(reg, q->iobase + QUADSPI_MCR);
> +	qspi_writel(q, reg, q->iobase + QUADSPI_MCR);
>  
>  	/*
>  	 * The minimum delay : 1 AHB + 2 SFCK clocks.
> @@ -572,7 +606,7 @@ static inline void fsl_qspi_invalid(struct fsl_qspi *q)
>  	udelay(1);
>  
>  	reg &= ~(QUADSPI_MCR_SWRSTHD_MASK | QUADSPI_MCR_SWRSTSD_MASK);
> -	writel(reg, q->iobase + QUADSPI_MCR);
> +	qspi_writel(q, reg, q->iobase + QUADSPI_MCR);
>  }
>  
>  static int fsl_qspi_nor_write(struct fsl_qspi *q, struct spi_nor *nor,
> @@ -586,20 +620,20 @@ static int fsl_qspi_nor_write(struct fsl_qspi *q, struct spi_nor *nor,
>  		q->chip_base_addr, to, count);
>  
>  	/* clear the TX FIFO. */
> -	tmp = readl(q->iobase + QUADSPI_MCR);
> -	writel(tmp | QUADSPI_MCR_CLR_TXF_MASK, q->iobase + QUADSPI_MCR);
> +	tmp = qspi_readl(q, q->iobase + QUADSPI_MCR);
> +	qspi_writel(q, tmp | QUADSPI_MCR_CLR_TXF_MASK, q->iobase + QUADSPI_MCR);
>  
>  	/* fill the TX data to the FIFO */
>  	for (j = 0, i = ((count + 3) / 4); j < i; j++) {
>  		tmp = fsl_qspi_endian_xchg(q, *txbuf);
> -		writel(tmp, q->iobase + QUADSPI_TBDR);
> +		qspi_writel(q, tmp, q->iobase + QUADSPI_TBDR);
>  		txbuf++;
>  	}
>  
>  	/* fill the TXFIFO upto 16 bytes for i.MX7d */
>  	if (needs_fill_txfifo(q))
>  		for (; i < 4; i++)
> -			writel(tmp, q->iobase + QUADSPI_TBDR);
> +			qspi_writel(q, tmp, q->iobase + QUADSPI_TBDR);
>  
>  	/* Trigger it */
>  	ret = fsl_qspi_runcmd(q, opcode, to, count);
> @@ -615,10 +649,10 @@ static void fsl_qspi_set_map_addr(struct fsl_qspi *q)
>  	int nor_size = q->nor_size;
>  	void __iomem *base = q->iobase;
>  
> -	writel(nor_size + q->memmap_phy, base + QUADSPI_SFA1AD);
> -	writel(nor_size * 2 + q->memmap_phy, base + QUADSPI_SFA2AD);
> -	writel(nor_size * 3 + q->memmap_phy, base + QUADSPI_SFB1AD);
> -	writel(nor_size * 4 + q->memmap_phy, base + QUADSPI_SFB2AD);
> +	qspi_writel(q, nor_size + q->memmap_phy, base + QUADSPI_SFA1AD);
> +	qspi_writel(q, nor_size * 2 + q->memmap_phy, base + QUADSPI_SFA2AD);
> +	qspi_writel(q, nor_size * 3 + q->memmap_phy, base + QUADSPI_SFB1AD);
> +	qspi_writel(q, nor_size * 4 + q->memmap_phy, base + QUADSPI_SFB2AD);
>  }
>  
>  /*
> @@ -640,24 +674,26 @@ static void fsl_qspi_init_abh_read(struct fsl_qspi *q)
>  	int seqid;
>  
>  	/* AHB configuration for access buffer 0/1/2 .*/
> -	writel(QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF0CR);
> -	writel(QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF1CR);
> -	writel(QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF2CR);
> +	qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF0CR);
> +	qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF1CR);
> +	qspi_writel(q, QUADSPI_BUFXCR_INVALID_MSTRID, base + QUADSPI_BUF2CR);
>  	/*
>  	 * Set ADATSZ with the maximum AHB buffer size to improve the
>  	 * read performance.
>  	 */
> -	writel(QUADSPI_BUF3CR_ALLMST_MASK | ((q->devtype_data->ahb_buf_size / 8)
> -			<< QUADSPI_BUF3CR_ADATSZ_SHIFT), base + QUADSPI_BUF3CR);
> +	qspi_writel(q, QUADSPI_BUF3CR_ALLMST_MASK |
> +			((q->devtype_data->ahb_buf_size / 8)
> +			<< QUADSPI_BUF3CR_ADATSZ_SHIFT),
> +			base + QUADSPI_BUF3CR);
>  
>  	/* We only use the buffer3 */
> -	writel(0, base + QUADSPI_BUF0IND);
> -	writel(0, base + QUADSPI_BUF1IND);
> -	writel(0, base + QUADSPI_BUF2IND);
> +	qspi_writel(q, 0, base + QUADSPI_BUF0IND);
> +	qspi_writel(q, 0, base + QUADSPI_BUF1IND);
> +	qspi_writel(q, 0, base + QUADSPI_BUF2IND);
>  
>  	/* Set the default lut sequence for AHB Read. */
>  	seqid = fsl_qspi_get_seqid(q, q->nor[0].read_opcode);
> -	writel(seqid << QUADSPI_BFGENCR_SEQID_SHIFT,
> +	qspi_writel(q, seqid << QUADSPI_BFGENCR_SEQID_SHIFT,
>  		q->iobase + QUADSPI_BFGENCR);
>  }
>  
> @@ -713,7 +749,7 @@ static int fsl_qspi_nor_setup(struct fsl_qspi *q)
>  		return ret;
>  
>  	/* Reset the module */
> -	writel(QUADSPI_MCR_SWRSTSD_MASK | QUADSPI_MCR_SWRSTHD_MASK,
> +	qspi_writel(q, QUADSPI_MCR_SWRSTSD_MASK | QUADSPI_MCR_SWRSTHD_MASK,
>  		base + QUADSPI_MCR);
>  	udelay(1);
>  
> @@ -721,24 +757,24 @@ static int fsl_qspi_nor_setup(struct fsl_qspi *q)
>  	fsl_qspi_init_lut(q);
>  
>  	/* Disable the module */
> -	writel(QUADSPI_MCR_MDIS_MASK | QUADSPI_MCR_RESERVED_MASK,
> +	qspi_writel(q, QUADSPI_MCR_MDIS_MASK | QUADSPI_MCR_RESERVED_MASK,
>  			base + QUADSPI_MCR);
>  
> -	reg = readl(base + QUADSPI_SMPR);
> -	writel(reg & ~(QUADSPI_SMPR_FSDLY_MASK
> +	reg = qspi_readl(q, base + QUADSPI_SMPR);
> +	qspi_writel(q, reg & ~(QUADSPI_SMPR_FSDLY_MASK
>  			| QUADSPI_SMPR_FSPHS_MASK
>  			| QUADSPI_SMPR_HSENA_MASK
>  			| QUADSPI_SMPR_DDRSMP_MASK), base + QUADSPI_SMPR);
>  
>  	/* Enable the module */
> -	writel(QUADSPI_MCR_RESERVED_MASK | QUADSPI_MCR_END_CFG_MASK,
> +	qspi_writel(q, QUADSPI_MCR_RESERVED_MASK | QUADSPI_MCR_END_CFG_MASK,
>  			base + QUADSPI_MCR);
>  
>  	/* clear all interrupt status */
> -	writel(0xffffffff, q->iobase + QUADSPI_FR);
> +	qspi_writel(q, 0xffffffff, q->iobase + QUADSPI_FR);
>  
>  	/* enable the interrupt */
> -	writel(QUADSPI_RSER_TFIE, q->iobase + QUADSPI_RSER);
> +	qspi_writel(q, QUADSPI_RSER_TFIE, q->iobase + QUADSPI_RSER);
>  
>  	return 0;
>  }
> @@ -954,6 +990,7 @@ static int fsl_qspi_probe(struct platform_device *pdev)
>  	if (IS_ERR(q->iobase))
>  		return PTR_ERR(q->iobase);
>  
> +	q->big_endian = of_property_read_bool(np, "big-endian");
>  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
>  					"QuadSPI-memory");
>  	if (!devm_request_mem_region(dev, res->start, resource_size(res),
> @@ -1101,8 +1138,8 @@ static int fsl_qspi_remove(struct platform_device *pdev)
>  	}
>  
>  	/* disable the hardware */
> -	writel(QUADSPI_MCR_MDIS_MASK, q->iobase + QUADSPI_MCR);
> -	writel(0x0, q->iobase + QUADSPI_RSER);
> +	qspi_writel(q, QUADSPI_MCR_MDIS_MASK, q->iobase + QUADSPI_MCR);
> +	qspi_writel(q, 0x0, q->iobase + QUADSPI_RSER);
>  
>  	mutex_destroy(&q->lock);
>  
> -- 
> 2.1.0.27.g96db324
> 
> 
Acked-by: Han xu <han.xu@....com>
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