[PATCH linux dev-5.4 13/16] soc: aspeed: xdma: Add memory controller configuration

[Eddie James <eajames@linux.ibm.com>]

Performing DMA requires configuring the memory protection register.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 arch/arm/boot/dts/aspeed-g5.dtsi |  3 ++-
 arch/arm/boot/dts/aspeed-g6.dtsi |  6 ++++++
 drivers/soc/aspeed/aspeed-xdma.c | 16 ++++++++++++++++
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/aspeed-g5.dtsi b/arch/arm/boot/dts/aspeed-g5.dtsi
index 1a6a12d2a489..6df572b4d88a 100644
--- a/arch/arm/boot/dts/aspeed-g5.dtsi
+++ b/arch/arm/boot/dts/aspeed-g5.dtsi
@@ -49,7 +49,7 @@
 	};
 
 	edac: sdram@1e6e0000 {
-		compatible = "aspeed,ast2500-sdram-edac";
+		compatible = "aspeed,ast2500-sdram-edac", "syscon";
 		reg = <0x1e6e0000 0x174>;
 		interrupts = <0>;
 		status = "disabled";
@@ -270,6 +270,7 @@
 				interrupts-extended = <&vic 6>, <&scu_ic ASPEED_AST2500_SCU_IC_PCIE_RESET_LO_TO_HI>;
 				pcie-device = "bmc";
 				aspeed,scu = <&syscon>;
+				sdmc = <&edac>;
 				status = "disabled";
 			};
 
diff --git a/arch/arm/boot/dts/aspeed-g6.dtsi b/arch/arm/boot/dts/aspeed-g6.dtsi
index e2a429a3a396..cb511e0b1046 100644
--- a/arch/arm/boot/dts/aspeed-g6.dtsi
+++ b/arch/arm/boot/dts/aspeed-g6.dtsi
@@ -289,6 +289,11 @@
 			status = "disabled";
 		};
 
+		sdmc: sdram@1e6e0000 {
+			compatible = "syscon";
+			reg = <0x1e6e0000 0xb8>;
+		};
+
 		apb {
 			compatible = "simple-bus";
 			#address-cells = <1>;
@@ -344,6 +349,7 @@
 						      <&scu_ic0 ASPEED_AST2600_SCU_IC0_PCIE_PERST_LO_TO_HI>;
 				pcie-device = "bmc";
 				aspeed,scu = <&syscon>;
+				sdmc = <&sdmc>;
 				status = "disabled";
 			};
 
diff --git a/drivers/soc/aspeed/aspeed-xdma.c b/drivers/soc/aspeed/aspeed-xdma.c
index 8c6408ff253b..ad29fdf30b06 100644
--- a/drivers/soc/aspeed/aspeed-xdma.c
+++ b/drivers/soc/aspeed/aspeed-xdma.c
@@ -50,6 +50,11 @@
 #define SCU_AST2600_BMC_CLASS_REV		0xc4c
 #define  SCU_BMC_CLASS_REV_XDMA			 0xff000001
 
+#define SDMC_REMAP                             0x008
+#define  SDMC_AST2500_REMAP_PCIE                BIT(16)
+#define  SDMC_AST2500_REMAP_XDMA                BIT(17)
+#define  SDMC_AST2600_REMAP_XDMA                BIT(18)
+
 #define XDMA_CMDQ_SIZE				PAGE_SIZE
 #define XDMA_NUM_CMDS				\
 	(XDMA_CMDQ_SIZE / sizeof(struct aspeed_xdma_cmd))
@@ -184,6 +189,7 @@ struct aspeed_xdma_chip {
 	u32 control;
 	u32 scu_bmc_class;
 	u32 scu_pcie_conf;
+	u32 sdmc_remap;
 	unsigned int queue_entry_size;
 	struct aspeed_xdma_regs regs;
 	struct aspeed_xdma_status_bits status_bits;
@@ -805,6 +811,7 @@ static int aspeed_xdma_probe(struct platform_device *pdev)
 	int irq;
 	int pcie_irq;
 	u32 memory[2];
+	struct regmap *sdmc;
 	struct aspeed_xdma *ctx;
 	struct device *dev = &pdev->dev;
 	const void *md = of_device_get_match_data(dev);
@@ -884,6 +891,13 @@ static int aspeed_xdma_probe(struct platform_device *pdev)
 		return rc;
 	}
 
+	sdmc = syscon_regmap_lookup_by_phandle(dev->of_node, "sdmc");
+	if (!IS_ERR(sdmc))
+		regmap_update_bits(sdmc, SDMC_REMAP, ctx->chip->sdmc_remap,
+				   ctx->chip->sdmc_remap);
+	else
+		dev_err(dev, "Unable to configure memory controller.\n");
+
 	rc = aspeed_xdma_init_scu(ctx, dev);
 	if (rc)
 		return rc;
@@ -968,6 +982,7 @@ static const struct aspeed_xdma_chip aspeed_ast2500_xdma_chip = {
 		XDMA_AST2500_CTRL_DS_TIMEOUT | XDMA_AST2500_CTRL_DS_CHECK_ID,
 	.scu_bmc_class = SCU_AST2500_BMC_CLASS_REV,
 	.scu_pcie_conf = SCU_AST2500_PCIE_CONF,
+	.sdmc_remap = SDMC_AST2500_REMAP_PCIE | SDMC_AST2500_REMAP_XDMA,
 	.queue_entry_size = XDMA_AST2500_QUEUE_ENTRY_SIZE,
 	.regs = {
 		.bmc_cmdq_addr = XDMA_AST2500_BMC_CMDQ_ADDR,
@@ -990,6 +1005,7 @@ static const struct aspeed_xdma_chip aspeed_ast2600_xdma_chip = {
 		XDMA_AST2600_CTRL_DS_DIRTY | XDMA_AST2600_CTRL_DS_SIZE_256,
 	.scu_bmc_class = SCU_AST2600_BMC_CLASS_REV,
 	.scu_pcie_conf = SCU_AST2600_PCIE_CONF,
+	.sdmc_remap = SDMC_AST2600_REMAP_XDMA,
 	.queue_entry_size = XDMA_AST2600_QUEUE_ENTRY_SIZE,
 	.regs = {
 		.bmc_cmdq_addr = XDMA_AST2600_BMC_CMDQ_ADDR,
-- 
2.24.0