EDAC/fsl_ddr: Add support for i.MX9 DDR controller

Add support for the i.MX9 DDR controller, which has different register
offsets and some function changes compared to the existing fsl_ddr
controller. The ECC and error injection functions are almost the same,
so update and reuse the driver for i.MX9. Add a special type 'TYPE_IMX9'
specifically for the i.MX9 controller to distinguish the differences.

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20241016-imx95_edac-v3-5-86ae6fc2756a@nxp.com

drivers/edac/fsl_ddr_edac.c

@@ -31,16 +31,28 @@
 
 static int edac_mc_idx;
 
+static inline void __iomem *ddr_reg_addr(struct fsl_mc_pdata *pdata, unsigned int off)
+{
+	if (pdata->flag == TYPE_IMX9 && off >= FSL_MC_DATA_ERR_INJECT_HI && off <= FSL_MC_ERR_SBE)
+		return pdata->inject_vbase + off - FSL_MC_DATA_ERR_INJECT_HI
+		       + IMX9_MC_DATA_ERR_INJECT_OFF;
+
+	if (pdata->flag == TYPE_IMX9 && off >= IMX9_MC_ERR_EN)
+		return pdata->inject_vbase + off - IMX9_MC_ERR_EN;
+
+	return pdata->mc_vbase + off;
+}
+
 static inline u32 ddr_in32(struct fsl_mc_pdata *pdata, unsigned int off)
 {
-	void __iomem *addr = pdata->mc_vbase + off;
+	void __iomem *addr = ddr_reg_addr(pdata, off);
 
 	return pdata->little_endian ? ioread32(addr) : ioread32be(addr);
 }
 
 static inline void ddr_out32(struct fsl_mc_pdata *pdata, unsigned int off, u32 value)
 {
-	void __iomem *addr = pdata->mc_vbase + off;
+	void __iomem *addr = ddr_reg_addr(pdata, off);
 
 	if (pdata->little_endian)
 		iowrite32(value, addr);
@@ -435,6 +447,9 @@ static void fsl_ddr_init_csrows(struct mem_ctl_info *mci)
 		case 0x05000000:
 			mtype = MEM_DDR4;
 			break;
+		case 0x04000000:
+			mtype = MEM_LPDDR4;
+			break;
 		default:
 			mtype = MEM_UNKNOWN;
 			break;
@@ -468,7 +483,9 @@ static void fsl_ddr_init_csrows(struct mem_ctl_info *mci)
 		dimm->grain = 8;
 		dimm->mtype = mtype;
 		dimm->dtype = DEV_UNKNOWN;
-		if (sdram_ctl & DSC_X32_EN)
+		if (pdata->flag == TYPE_IMX9)
+			dimm->dtype = DEV_X16;
+		else if (sdram_ctl & DSC_X32_EN)
 			dimm->dtype = DEV_X32;
 		dimm->edac_mode = EDAC_SECDED;
 	}
@@ -480,6 +497,7 @@ int fsl_mc_err_probe(struct platform_device *op)
 	struct edac_mc_layer layers[2];
 	struct fsl_mc_pdata *pdata;
 	struct resource r;
+	u32 ecc_en_mask;
 	u32 sdram_ctl;
 	int res;
 
@@ -507,6 +525,8 @@ int fsl_mc_err_probe(struct platform_device *op)
 	mci->ctl_name = pdata->name;
 	mci->dev_name = pdata->name;
 
+	pdata->flag = (unsigned long)device_get_match_data(&op->dev);
+
 	/*
 	 * Get the endianness of DDR controller registers.
 	 * Default is big endian.
@@ -535,8 +555,23 @@ int fsl_mc_err_probe(struct platform_device *op)
 		goto err;
 	}
 
+	if (pdata->flag == TYPE_IMX9) {
+		pdata->inject_vbase = devm_platform_ioremap_resource_byname(op, "inject");
+		if (IS_ERR(pdata->inject_vbase)) {
+			res = -ENOMEM;
+			goto err;
+		}
+	}
+
+	if (pdata->flag == TYPE_IMX9) {
+		sdram_ctl = ddr_in32(pdata, IMX9_MC_ERR_EN);
+		ecc_en_mask = ERR_ECC_EN | ERR_INLINE_ECC;
+	} else {
 		sdram_ctl = ddr_in32(pdata, FSL_MC_DDR_SDRAM_CFG);
-	if (!(sdram_ctl & DSC_ECC_EN)) {
+		ecc_en_mask = DSC_ECC_EN;
+	}
+
+	if ((sdram_ctl & ecc_en_mask) != ecc_en_mask) {
 		/* no ECC */
 		pr_warn("%s: No ECC DIMMs discovered\n", __func__);
 		res = -ENODEV;
@@ -547,7 +582,8 @@ int fsl_mc_err_probe(struct platform_device *op)
 	mci->mtype_cap = MEM_FLAG_DDR | MEM_FLAG_RDDR |
 			 MEM_FLAG_DDR2 | MEM_FLAG_RDDR2 |
 			 MEM_FLAG_DDR3 | MEM_FLAG_RDDR3 |
-			 MEM_FLAG_DDR4 | MEM_FLAG_RDDR4;
+			 MEM_FLAG_DDR4 | MEM_FLAG_RDDR4 |
+			 MEM_FLAG_LPDDR4;
 	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
 	mci->edac_cap = EDAC_FLAG_SECDED;
 	mci->mod_name = EDAC_MOD_STR;

drivers/edac/fsl_ddr_edac.h

@@ -39,6 +39,9 @@
 #define FSL_MC_CAPTURE_EXT_ADDRESS	0x0e54
 #define FSL_MC_ERR_SBE		0x0e58
 
+#define IMX9_MC_ERR_EN			0x1000
+#define IMX9_MC_DATA_ERR_INJECT_OFF	0x100
+
 #define DSC_MEM_EN	0x80000000
 #define DSC_ECC_EN	0x20000000
 #define DSC_RD_EN	0x10000000
@@ -46,6 +49,9 @@
 #define DSC_DBW_32	0x00080000
 #define DSC_DBW_64	0x00000000
 
+#define ERR_ECC_EN      0x80000000
+#define ERR_INLINE_ECC  0x40000000
+
 #define DSC_SDTYPE_MASK		0x07000000
 #define DSC_X32_EN	0x00000020
 
@@ -65,14 +71,18 @@
 #define	DDR_EDI_SBED	0x4	/* single-bit ECC error disable */
 #define	DDR_EDI_MBED	0x8	/* multi-bit ECC error disable */
 
+#define TYPE_IMX9	0x1	/* MC used by iMX9 having registers changed */
+
 struct fsl_mc_pdata {
 	char *name;
 	int edac_idx;
 	void __iomem *mc_vbase;
+	void __iomem *inject_vbase;
 	int irq;
 	u32 orig_ddr_err_disable;
 	u32 orig_ddr_err_sbe;
 	bool little_endian;
+	unsigned long flag;
 };
 int fsl_mc_err_probe(struct platform_device *op);
 void fsl_mc_err_remove(struct platform_device *op);

drivers/edac/layerscape_edac.c

@@ -21,6 +21,7 @@
 
 static const struct of_device_id fsl_ddr_mc_err_of_match[] = {
 	{ .compatible = "fsl,qoriq-memory-controller", },
+	{ .compatible = "nxp,imx9-memory-controller", .data = (void *)TYPE_IMX9, },
 	{},
 };
 MODULE_DEVICE_TABLE(of, fsl_ddr_mc_err_of_match);