Re: [PATCH v3 1/4] mtd: spi-nor: fsl-quadspi: add big-endian support

From: Han Xu
Date: Mon Jan 04 2016 - 16:12:20 EST

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On Thu, Dec 24, 2015 at 07:00:18PM +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@xxxxxxx>
> ---
> Changed in v3:
> Update my email to <yao.yuan@xxxxxxx>
>
> 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@%.8x, 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");

once again, please document the new property.

> 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
>

--
Best Regards,

Han "Allen" Xu

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