[PATCH] spi: fsl-cpm: Properly define and use IO pointers

[PATCH] spi: fsl-cpm: Properly define and use IO pointers

[Christophe Leroy]

Sparse reports several issues with IO pointers.

Fix it by adding missing __iomem flags and using iowriteXXbe()
generic helpers instead of the powerpc specific out_beXX() ones.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202307252052.7RqHxFZj-lkp@intel.com/
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 drivers/spi/spi-fsl-cpm.c | 74 +++++++++++++++++++--------------------
 1 file changed, 37 insertions(+), 37 deletions(-)

diff --git a/drivers/spi/spi-fsl-cpm.c b/drivers/spi/spi-fsl-cpm.c
index 38452089e8f3..47c7a5c6257f 100644
--- a/drivers/spi/spi-fsl-cpm.c
+++ b/drivers/spi/spi-fsl-cpm.c
@@ -56,12 +56,12 @@ void fsl_spi_cpm_reinit_txrx(struct mpc8xxx_spi *mspi)
 			     QE_CR_PROTOCOL_UNSPECIFIED, 0);
 	} else {
 		if (mspi->flags & SPI_CPM1) {
-			out_be32(&mspi->pram->rstate, 0);
-			out_be16(&mspi->pram->rbptr,
-				 in_be16(&mspi->pram->rbase));
-			out_be32(&mspi->pram->tstate, 0);
-			out_be16(&mspi->pram->tbptr,
-				 in_be16(&mspi->pram->tbase));
+			iowrite32be(0, &mspi->pram->rstate);
+			iowrite16be(ioread16be(&mspi->pram->rbase),
+				    &mspi->pram->rbptr);
+			iowrite32be(0, &mspi->pram->tstate);
+			iowrite16be(ioread16be(&mspi->pram->tbase),
+				    &mspi->pram->tbptr);
 		} else {
 			cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX);
 		}
@@ -75,24 +75,24 @@ static void fsl_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi)
 	struct cpm_buf_desc __iomem *rx_bd = mspi->rx_bd;
 	unsigned int xfer_len = min(mspi->count, SPI_MRBLR);
 	unsigned int xfer_ofs;
-	struct fsl_spi_reg *reg_base = mspi->reg_base;
+	struct fsl_spi_reg __iomem *reg_base = mspi->reg_base;
 
 	xfer_ofs = mspi->xfer_in_progress->len - mspi->count;
 
 	if (mspi->rx_dma == mspi->dma_dummy_rx)
-		out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma);
+		iowrite32be(mspi->rx_dma, &rx_bd->cbd_bufaddr);
 	else
-		out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs);
-	out_be16(&rx_bd->cbd_datlen, 0);
-	out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP);
+		iowrite32be(mspi->rx_dma + xfer_ofs, &rx_bd->cbd_bufaddr);
+	iowrite16be(0, &rx_bd->cbd_datlen);
+	iowrite16be(BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP, &rx_bd->cbd_sc);
 
 	if (mspi->tx_dma == mspi->dma_dummy_tx)
-		out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma);
+		iowrite32be(mspi->tx_dma, &tx_bd->cbd_bufaddr);
 	else
-		out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs);
-	out_be16(&tx_bd->cbd_datlen, xfer_len);
-	out_be16(&tx_bd->cbd_sc, BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP |
-				 BD_SC_LAST);
+		iowrite32be(mspi->tx_dma + xfer_ofs, &tx_bd->cbd_bufaddr);
+	iowrite16be(xfer_len, &tx_bd->cbd_datlen);
+	iowrite16be(BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP | BD_SC_LAST,
+		    &tx_bd->cbd_sc);
 
 	/* start transfer */
 	mpc8xxx_spi_write_reg(&reg_base->command, SPCOM_STR);
@@ -102,7 +102,7 @@ int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
 		     struct spi_transfer *t, bool is_dma_mapped)
 {
 	struct device *dev = mspi->dev;
-	struct fsl_spi_reg *reg_base = mspi->reg_base;
+	struct fsl_spi_reg __iomem *reg_base = mspi->reg_base;
 
 	if (is_dma_mapped) {
 		mspi->map_tx_dma = 0;
@@ -123,7 +123,7 @@ int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
 	}
 	if (t->bits_per_word == 16 && t->tx_buf) {
 		const u16 *src = t->tx_buf;
-		u16 *dst;
+		__le16 *dst;
 		int i;
 
 		dst = kmalloc(t->len, GFP_KERNEL);
@@ -202,12 +202,12 @@ EXPORT_SYMBOL_GPL(fsl_spi_cpm_bufs_complete);
 void fsl_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events)
 {
 	u16 len;
-	struct fsl_spi_reg *reg_base = mspi->reg_base;
+	struct fsl_spi_reg __iomem *reg_base = mspi->reg_base;
 
 	dev_dbg(mspi->dev, "%s: bd datlen %d, count %d\n", __func__,
-		in_be16(&mspi->rx_bd->cbd_datlen), mspi->count);
+		ioread16be(&mspi->rx_bd->cbd_datlen), mspi->count);
 
-	len = in_be16(&mspi->rx_bd->cbd_datlen);
+	len = ioread16be(&mspi->rx_bd->cbd_datlen);
 	if (len > mspi->count) {
 		WARN_ON(1);
 		len = mspi->count;
@@ -328,7 +328,7 @@ int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi)
 	}
 
 	if (mspi->flags & SPI_CPM1) {
-		void *pram;
+		void __iomem *pram;
 
 		pram = devm_platform_ioremap_resource(to_platform_device(dev),
 						      1);
@@ -374,21 +374,21 @@ int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi)
 	mspi->rx_bd = cpm_muram_addr(bds_ofs + sizeof(*mspi->tx_bd));
 
 	/* Initialize parameter ram. */
-	out_be16(&mspi->pram->tbase, cpm_muram_offset(mspi->tx_bd));
-	out_be16(&mspi->pram->rbase, cpm_muram_offset(mspi->rx_bd));
-	out_8(&mspi->pram->tfcr, CPMFCR_EB | CPMFCR_GBL);
-	out_8(&mspi->pram->rfcr, CPMFCR_EB | CPMFCR_GBL);
-	out_be16(&mspi->pram->mrblr, SPI_MRBLR);
-	out_be32(&mspi->pram->rstate, 0);
-	out_be32(&mspi->pram->rdp, 0);
-	out_be16(&mspi->pram->rbptr, 0);
-	out_be16(&mspi->pram->rbc, 0);
-	out_be32(&mspi->pram->rxtmp, 0);
-	out_be32(&mspi->pram->tstate, 0);
-	out_be32(&mspi->pram->tdp, 0);
-	out_be16(&mspi->pram->tbptr, 0);
-	out_be16(&mspi->pram->tbc, 0);
-	out_be32(&mspi->pram->txtmp, 0);
+	iowrite16be(cpm_muram_offset(mspi->tx_bd), &mspi->pram->tbase);
+	iowrite16be(cpm_muram_offset(mspi->rx_bd), &mspi->pram->rbase);
+	iowrite8(CPMFCR_EB | CPMFCR_GBL, &mspi->pram->tfcr);
+	iowrite8(CPMFCR_EB | CPMFCR_GBL, &mspi->pram->rfcr);
+	iowrite16be(SPI_MRBLR, &mspi->pram->mrblr);
+	iowrite32be(0, &mspi->pram->rstate);
+	iowrite32be(0, &mspi->pram->rdp);
+	iowrite16be(0, &mspi->pram->rbptr);
+	iowrite16be(0, &mspi->pram->rbc);
+	iowrite32be(0, &mspi->pram->rxtmp);
+	iowrite32be(0, &mspi->pram->tstate);
+	iowrite32be(0, &mspi->pram->tdp);
+	iowrite16be(0, &mspi->pram->tbptr);
+	iowrite16be(0, &mspi->pram->tbc);
+	iowrite32be(0, &mspi->pram->txtmp);
 
 	return 0;
 
-- 
2.41.0

Re: [PATCH] spi: fsl-cpm: Properly define and use IO pointers

[Mark Brown]

On Wed, 09 Aug 2023 10:54:27 +0200, Christophe Leroy wrote:
> Sparse reports several issues with IO pointers.
> 
> Fix it by adding missing __iomem flags and using iowriteXXbe()
> generic helpers instead of the powerpc specific out_beXX() ones.
> 
> 

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[1/1] spi: fsl-cpm: Properly define and use IO pointers
      commit: ddaec4e44d4e2a556b51159d48788a85ff67179d

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark