Memory controller drivers for v5.16

1. Renesas RPC: fix unaligned bus access and QSPI data transfers in
    manual modes.
 2. Renesas RPC: select RESET_CONTROLLER as it is necessary for
    operation.
 3. FSL IFC: fix error paths.
 4. Broadcom: allow building as module.
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Merge tag 'memory-controller-drv-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux-mem-ctrl into arm/drivers

Memory controller drivers for v5.16

1. Renesas RPC: fix unaligned bus access and QSPI data transfers in
   manual modes.
2. Renesas RPC: select RESET_CONTROLLER as it is necessary for
   operation.
3. FSL IFC: fix error paths.
4. Broadcom: allow building as module.

* tag 'memory-controller-drv-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux-mem-ctrl:
  memory: fsl_ifc: fix leak of irq and nand_irq in fsl_ifc_ctrl_probe
  memory: renesas-rpc-if: RENESAS_RPCIF should select RESET_CONTROLLER
  memory: brcmstb_dpfe: Allow building Broadcom STB DPFE as module
  memory: samsung: describe drivers in KConfig
  memory: renesas-rpc-if: Avoid unaligned bus access for HyperFlash
  memory: renesas-rpc-if: Correct QSPI data transfer in Manual mode
  dt-bindings: rpc: renesas-rpc-if: Add support for the R8A779A0 RPC-IF

Link: https://lore.kernel.org/r/20211010175836.13302-1-krzysztof.kozlowski@canonical.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Documentation/devicetree/bindings/memory-controllers/renesas,rpc-if.yaml

@@ -33,6 +33,7 @@ properties:
           - renesas,r8a77970-rpc-if       # R-Car V3M
           - renesas,r8a77980-rpc-if       # R-Car V3H
           - renesas,r8a77995-rpc-if       # R-Car D3
+          - renesas,r8a779a0-rpc-if       # R-Car V3U
       - const: renesas,rcar-gen3-rpc-if   # a generic R-Car gen3 or RZ/G2 device
 
   reg:

drivers/memory/Kconfig

@@ -55,8 +55,8 @@ config ATMEL_EBI
 	  SRAMs, ATA devices, etc.
 
 config BRCMSTB_DPFE
-	bool "Broadcom STB DPFE driver" if COMPILE_TEST
-	default y if ARCH_BRCMSTB
+	tristate "Broadcom STB DPFE driver"
+	default ARCH_BRCMSTB
 	depends on ARCH_BRCMSTB || COMPILE_TEST
 	help
 	  This driver provides access to the DPFE interface of Broadcom
@@ -210,6 +210,7 @@ config RENESAS_RPCIF
 	tristate "Renesas RPC-IF driver"
 	depends on ARCH_RENESAS || COMPILE_TEST
 	select REGMAP_MMIO
+	select RESET_CONTROLLER
 	help
 	  This supports Renesas R-Car Gen3 or RZ/G2 RPC-IF which provides
 	  either SPI host or HyperFlash. You'll have to select individual

drivers/memory/fsl_ifc.c

@@ -263,7 +263,7 @@ static int fsl_ifc_ctrl_probe(struct platform_device *dev)
 
 	ret = fsl_ifc_ctrl_init(fsl_ifc_ctrl_dev);
 	if (ret < 0)
-		goto err;
+		goto err_unmap_nandirq;
 
 	init_waitqueue_head(&fsl_ifc_ctrl_dev->nand_wait);
 
@@ -272,7 +272,7 @@ static int fsl_ifc_ctrl_probe(struct platform_device *dev)
 	if (ret != 0) {
 		dev_err(&dev->dev, "failed to install irq (%d)\n",
 			fsl_ifc_ctrl_dev->irq);
-		goto err_irq;
+		goto err_unmap_nandirq;
 	}
 
 	if (fsl_ifc_ctrl_dev->nand_irq) {
@@ -281,17 +281,16 @@ static int fsl_ifc_ctrl_probe(struct platform_device *dev)
 		if (ret != 0) {
 			dev_err(&dev->dev, "failed to install irq (%d)\n",
 				fsl_ifc_ctrl_dev->nand_irq);
-			goto err_nandirq;
+			goto err_free_irq;
 		}
 	}
 
 	return 0;
 
-err_nandirq:
-	free_irq(fsl_ifc_ctrl_dev->nand_irq, fsl_ifc_ctrl_dev);
-	irq_dispose_mapping(fsl_ifc_ctrl_dev->nand_irq);
-err_irq:
+err_free_irq:
 	free_irq(fsl_ifc_ctrl_dev->irq, fsl_ifc_ctrl_dev);
+err_unmap_nandirq:
+	irq_dispose_mapping(fsl_ifc_ctrl_dev->nand_irq);
 	irq_dispose_mapping(fsl_ifc_ctrl_dev->irq);
 err:
 	iounmap(fsl_ifc_ctrl_dev->gregs);

drivers/memory/renesas-rpc-if.c

@@ -160,10 +160,61 @@ static const struct regmap_access_table rpcif_volatile_table = {
 	.n_yes_ranges	= ARRAY_SIZE(rpcif_volatile_ranges),
 };
 
+
+/*
+ * Custom accessor functions to ensure SMRDR0 and SMWDR0 are always accessed
+ * with proper width. Requires SMENR_SPIDE to be correctly set before!
+ */
+static int rpcif_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+	struct rpcif *rpc = context;
+
+	if (reg == RPCIF_SMRDR0 || reg == RPCIF_SMWDR0) {
+		u32 spide = readl(rpc->base + RPCIF_SMENR) & RPCIF_SMENR_SPIDE(0xF);
+
+		if (spide == 0x8) {
+			*val = readb(rpc->base + reg);
+			return 0;
+		} else if (spide == 0xC) {
+			*val = readw(rpc->base + reg);
+			return 0;
+		} else if (spide != 0xF) {
+			return -EILSEQ;
+		}
+	}
+
+	*val = readl(rpc->base + reg);
+	return 0;
+}
+
+static int rpcif_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+	struct rpcif *rpc = context;
+
+	if (reg == RPCIF_SMRDR0 || reg == RPCIF_SMWDR0) {
+		u32 spide = readl(rpc->base + RPCIF_SMENR) & RPCIF_SMENR_SPIDE(0xF);
+
+		if (spide == 0x8) {
+			writeb(val, rpc->base + reg);
+			return 0;
+		} else if (spide == 0xC) {
+			writew(val, rpc->base + reg);
+			return 0;
+		} else if (spide != 0xF) {
+			return -EILSEQ;
+		}
+	}
+
+	writel(val, rpc->base + reg);
+	return 0;
+}
+
 static const struct regmap_config rpcif_regmap_config = {
 	.reg_bits	= 32,
 	.val_bits	= 32,
 	.reg_stride	= 4,
+	.reg_read	= rpcif_reg_read,
+	.reg_write	= rpcif_reg_write,
 	.fast_io	= true,
 	.max_register	= RPCIF_PHYINT,
 	.volatile_table	= &rpcif_volatile_table,
@@ -173,17 +224,15 @@ int rpcif_sw_init(struct rpcif *rpc, struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct resource *res;
-	void __iomem *base;
 
 	rpc->dev = dev;
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
-	base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(base))
-		return PTR_ERR(base);
+	rpc->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(rpc->base))
+		return PTR_ERR(rpc->base);
 
-	rpc->regmap = devm_regmap_init_mmio(&pdev->dev, base,
-					    &rpcif_regmap_config);
+	rpc->regmap = devm_regmap_init(&pdev->dev, NULL, rpc, &rpcif_regmap_config);
 	if (IS_ERR(rpc->regmap)) {
 		dev_err(&pdev->dev,
 			"failed to init regmap for rpcif, error %ld\n",
@@ -354,20 +403,16 @@ void rpcif_prepare(struct rpcif *rpc, const struct rpcif_op *op, u64 *offs,
 			nbytes = op->data.nbytes;
 		rpc->xferlen = nbytes;
 
-		rpc->enable |= RPCIF_SMENR_SPIDE(rpcif_bits_set(rpc, nbytes)) |
-			RPCIF_SMENR_SPIDB(rpcif_bit_size(op->data.buswidth));
+		rpc->enable |= RPCIF_SMENR_SPIDB(rpcif_bit_size(op->data.buswidth));
 	}
 }
 EXPORT_SYMBOL(rpcif_prepare);
 
 int rpcif_manual_xfer(struct rpcif *rpc)
 {
-	u32 smenr, smcr, pos = 0, max = 4;
+	u32 smenr, smcr, pos = 0, max = rpc->bus_size == 2 ? 8 : 4;
 	int ret = 0;
 
-	if (rpc->bus_size == 2)
-		max = 8;
-
 	pm_runtime_get_sync(rpc->dev);
 
 	regmap_update_bits(rpc->regmap, RPCIF_PHYCNT,
@@ -378,37 +423,36 @@ int rpcif_manual_xfer(struct rpcif *rpc)
 	regmap_write(rpc->regmap, RPCIF_SMOPR, rpc->option);
 	regmap_write(rpc->regmap, RPCIF_SMDMCR, rpc->dummy);
 	regmap_write(rpc->regmap, RPCIF_SMDRENR, rpc->ddr);
+	regmap_write(rpc->regmap, RPCIF_SMADR, rpc->smadr);
 	smenr = rpc->enable;
 
 	switch (rpc->dir) {
 	case RPCIF_DATA_OUT:
 		while (pos < rpc->xferlen) {
-			u32 nbytes = rpc->xferlen - pos;
-			u32 data[2];
+			u32 bytes_left = rpc->xferlen - pos;
+			u32 nbytes, data[2];
 
 			smcr = rpc->smcr | RPCIF_SMCR_SPIE;
-			if (nbytes > max) {
-				nbytes = max;
+
+			/* nbytes may only be 1, 2, 4, or 8 */
+			nbytes = bytes_left >= max ? max : (1 << ilog2(bytes_left));
+			if (bytes_left > nbytes)
 				smcr |= RPCIF_SMCR_SSLKP;
-			}
+
+			smenr |= RPCIF_SMENR_SPIDE(rpcif_bits_set(rpc, nbytes));
+			regmap_write(rpc->regmap, RPCIF_SMENR, smenr);
 
 			memcpy(data, rpc->buffer + pos, nbytes);
-			if (nbytes > 4) {
+			if (nbytes == 8) {
 				regmap_write(rpc->regmap, RPCIF_SMWDR1,
 					     data[0]);
 				regmap_write(rpc->regmap, RPCIF_SMWDR0,
 					     data[1]);
-			} else if (nbytes > 2) {
+			} else {
 				regmap_write(rpc->regmap, RPCIF_SMWDR0,
 					     data[0]);
-			} else	{
-				regmap_write(rpc->regmap, RPCIF_SMWDR0,
-					     data[0] << 16);
 			}
 
-			regmap_write(rpc->regmap, RPCIF_SMADR,
-				     rpc->smadr + pos);
-			regmap_write(rpc->regmap, RPCIF_SMENR, smenr);
 			regmap_write(rpc->regmap, RPCIF_SMCR, smcr);
 			ret = wait_msg_xfer_end(rpc);
 			if (ret)
@@ -448,14 +492,16 @@ int rpcif_manual_xfer(struct rpcif *rpc)
 			break;
 		}
 		while (pos < rpc->xferlen) {
-			u32 nbytes = rpc->xferlen - pos;
-			u32 data[2];
+			u32 bytes_left = rpc->xferlen - pos;
+			u32 nbytes, data[2];
 
-			if (nbytes > max)
-				nbytes = max;
+			/* nbytes may only be 1, 2, 4, or 8 */
+			nbytes = bytes_left >= max ? max : (1 << ilog2(bytes_left));
 
 			regmap_write(rpc->regmap, RPCIF_SMADR,
 				     rpc->smadr + pos);
+			smenr &= ~RPCIF_SMENR_SPIDE(0xF);
+			smenr |= RPCIF_SMENR_SPIDE(rpcif_bits_set(rpc, nbytes));
 			regmap_write(rpc->regmap, RPCIF_SMENR, smenr);
 			regmap_write(rpc->regmap, RPCIF_SMCR,
 				     rpc->smcr | RPCIF_SMCR_SPIE);
@@ -463,18 +509,14 @@ int rpcif_manual_xfer(struct rpcif *rpc)
 			if (ret)
 				goto err_out;
 
-			if (nbytes > 4) {
+			if (nbytes == 8) {
 				regmap_read(rpc->regmap, RPCIF_SMRDR1,
 					    &data[0]);
 				regmap_read(rpc->regmap, RPCIF_SMRDR0,
 					    &data[1]);
-			} else if (nbytes > 2) {
+			} else {
 				regmap_read(rpc->regmap, RPCIF_SMRDR0,
 					    &data[0]);
-			} else	{
-				regmap_read(rpc->regmap, RPCIF_SMRDR0,
-					    &data[0]);
-				data[0] >>= 16;
 			}
 			memcpy(rpc->buffer + pos, data, nbytes);
 
@@ -502,6 +544,48 @@ int rpcif_manual_xfer(struct rpcif *rpc)
 }
 EXPORT_SYMBOL(rpcif_manual_xfer);
 
+static void memcpy_fromio_readw(void *to,
+				const void __iomem *from,
+				size_t count)
+{
+	const int maxw = (IS_ENABLED(CONFIG_64BIT)) ? 8 : 4;
+	u8 buf[2];
+
+	if (count && ((unsigned long)from & 1)) {
+		*(u16 *)buf = __raw_readw((void __iomem *)((unsigned long)from & ~1));
+		*(u8 *)to = buf[1];
+		from++;
+		to++;
+		count--;
+	}
+	while (count >= 2 && !IS_ALIGNED((unsigned long)from, maxw)) {
+		*(u16 *)to = __raw_readw(from);
+		from += 2;
+		to += 2;
+		count -= 2;
+	}
+	while (count >= maxw) {
+#ifdef CONFIG_64BIT
+		*(u64 *)to = __raw_readq(from);
+#else
+		*(u32 *)to = __raw_readl(from);
+#endif
+		from += maxw;
+		to += maxw;
+		count -= maxw;
+	}
+	while (count >= 2) {
+		*(u16 *)to = __raw_readw(from);
+		from += 2;
+		to += 2;
+		count -= 2;
+	}
+	if (count) {
+		*(u16 *)buf = __raw_readw(from);
+		*(u8 *)to = buf[0];
+	}
+}
+
 ssize_t rpcif_dirmap_read(struct rpcif *rpc, u64 offs, size_t len, void *buf)
 {
 	loff_t from = offs & (RPCIF_DIRMAP_SIZE - 1);
@@ -523,7 +607,10 @@ ssize_t rpcif_dirmap_read(struct rpcif *rpc, u64 offs, size_t len, void *buf)
 	regmap_write(rpc->regmap, RPCIF_DRDMCR, rpc->dummy);
 	regmap_write(rpc->regmap, RPCIF_DRDRENR, rpc->ddr);
 
-	memcpy_fromio(buf, rpc->dirmap + from, len);
+	if (rpc->bus_size == 2)
+		memcpy_fromio_readw(buf, rpc->dirmap + from, len);
+	else
+		memcpy_fromio(buf, rpc->dirmap + from, len);
 
 	pm_runtime_put(rpc->dev);
 

drivers/memory/samsung/Kconfig

@@ -14,11 +14,12 @@ config EXYNOS5422_DMC
 	depends on DEVFREQ_GOV_SIMPLE_ONDEMAND
 	depends on (PM_DEVFREQ && PM_DEVFREQ_EVENT)
 	help
-	  This adds driver for Exynos5422 DMC (Dynamic Memory Controller).
-	  The driver provides support for Dynamic Voltage and Frequency Scaling in
-	  DMC and DRAM. It also supports changing timings of DRAM running with
-	  different frequency. The timings are calculated based on DT memory
-	  information.
+	  This adds driver for Samsung Exynos5422 SoC DMC (Dynamic Memory
+	  Controller).  The driver provides support for Dynamic Voltage and
+	  Frequency Scaling in DMC and DRAM. It also supports changing timings
+	  of DRAM running with different frequency. The timings are calculated
+	  based on DT memory information.
+	  If unsure, say Y on devices with Samsung Exynos SoCs.
 
 config EXYNOS_SROM
 	bool "Exynos SROM controller driver" if COMPILE_TEST
@@ -29,6 +30,6 @@ config EXYNOS_SROM
 	  during suspend.  If however appropriate device tree configuration
 	  is provided, the driver enables support for external memory
 	  or external devices.
-	  If unsure, say Y on devices with Samsung Exynos SocS.
+	  If unsure, say Y on devices with Samsung Exynos SoCs.
 
 endif

include/memory/renesas-rpc-if.h

@@ -59,6 +59,7 @@ struct rpcif_op {
 
 struct rpcif {
 	struct device *dev;
+	void __iomem *base;
 	void __iomem *dirmap;
 	struct regmap *regmap;
 	struct reset_control *rstc;