board: starfive: support Milk-V Mars board

The differences between the Milk-V Mars board and the VisionFive 2 board
are small enough that we can support both using the same U-Boot build.

* The model and compatible property are taken from proposed Linux patches.
* The EEPROM is atmel,24c02 according to the vendor U-Boot.
* The second Ethernet port is not available.

usb@10100000 does not exist in U-Boot yet. So we don't have to reflect
differences in usage here.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>

board/starfive/visionfive2/spl.c

@@ -27,6 +27,26 @@ struct starfive_vf2_pro {
 	const char *value;
 };
 
+static const struct starfive_vf2_pro milk_v_mars[] = {
+	{"/soc/ethernet@16030000", "starfive,tx-use-rgmii-clk", NULL},
+	{"/soc/ethernet@16040000", "starfive,tx-use-rgmii-clk", NULL},
+
+	{"/soc/ethernet@16030000/mdio/ethernet-phy@0",
+		"motorcomm,tx-clk-adj-enabled", NULL},
+	{"/soc/ethernet@16030000/mdio/ethernet-phy@0",
+		"motorcomm,tx-clk-100-inverted", NULL},
+	{"/soc/ethernet@16030000/mdio/ethernet-phy@0",
+		"motorcomm,tx-clk-1000-inverted", NULL},
+	{"/soc/ethernet@16030000/mdio/ethernet-phy@0",
+		"motorcomm,rx-clk-drv-microamp", "3970"},
+	{"/soc/ethernet@16030000/mdio/ethernet-phy@0",
+		"motorcomm,rx-data-drv-microamp", "2910"},
+	{"/soc/ethernet@16030000/mdio/ethernet-phy@0",
+		"rx-internal-delay-ps", "1900"},
+	{"/soc/ethernet@16030000/mdio/ethernet-phy@0",
+		"tx-internal-delay-ps", "1500"},
+};
+
 static const struct starfive_vf2_pro starfive_vera[] = {
 	{"/soc/ethernet@16030000/mdio/ethernet-phy@0", "rx-internal-delay-ps",
 		"1900"},
@@ -67,6 +87,49 @@ static const struct starfive_vf2_pro starfive_verb[] = {
 		"tx-internal-delay-ps", "0"},
 };
 
+void spl_fdt_fixup_mars(void *fdt)
+{
+	static const char compat[] = "milkv,mars\0starfive,jh7110";
+	u32 phandle;
+	u8 i;
+	int offset;
+	int ret;
+
+	fdt_setprop(fdt, fdt_path_offset(fdt, "/"), "compatible", compat, sizeof(compat));
+	fdt_setprop_string(fdt, fdt_path_offset(fdt, "/"), "model",
+			   "Milk-V Mars");
+
+	/* gmac0 */
+	offset = fdt_path_offset(fdt, "/soc/clock-controller@17000000");
+	phandle = fdt_get_phandle(fdt, offset);
+	offset = fdt_path_offset(fdt, "/soc/ethernet@16030000");
+
+	fdt_setprop_u32(fdt, offset, "assigned-clocks", phandle);
+	fdt_appendprop_u32(fdt, offset, "assigned-clocks", JH7110_AONCLK_GMAC0_TX);
+	fdt_setprop_u32(fdt, offset,  "assigned-clock-parents", phandle);
+	fdt_appendprop_u32(fdt, offset,  "assigned-clock-parents",
+			   JH7110_AONCLK_GMAC0_RMII_RTX);
+
+	/* gmac1 */
+	fdt_setprop_string(fdt, fdt_path_offset(fdt, "/soc/ethernet@16040000"),
+			   "status", "disabled");
+
+	for (i = 0; i < ARRAY_SIZE(milk_v_mars); i++) {
+		offset = fdt_path_offset(fdt, milk_v_mars[i].path);
+
+		if (milk_v_mars[i].value)
+			ret = fdt_setprop_u32(fdt, offset, milk_v_mars[i].name,
+					      dectoul(milk_v_mars[i].value, NULL));
+		else
+			ret = fdt_setprop_empty(fdt, offset, milk_v_mars[i].name);
+
+		if (ret) {
+			pr_err("%s set prop %s fail.\n", __func__, milk_v_mars[i].name);
+				break;
+		}
+	}
+}
+
 void spl_fdt_fixup_version_a(void *fdt)
 {
 	static const char compat[] = "starfive,visionfive-2-v1.2a\0starfive,jh7110";
@@ -167,22 +230,34 @@ void spl_fdt_fixup_version_b(void *fdt)
 void spl_perform_fixups(struct spl_image_info *spl_image)
 {
 	u8 version;
+	const char *product_id;
 
-	version = get_pcb_revision_from_eeprom();
+	product_id = get_product_id_from_eeprom();
-	switch (version) {
+	if (!product_id) {
-	case 'a':
+		pr_err("Can't read EEPROM\n");
-	case 'A':
+		return;
-		spl_fdt_fixup_version_a(spl_image->fdt_addr);
+	}
-		break;
+	if (!strncmp(product_id, "MARS", 4)) {
+		spl_fdt_fixup_mars(spl_image->fdt_addr);
+	} else if (!strncmp(product_id, "VF7110", 6)) {
+		version = get_pcb_revision_from_eeprom();
+		switch (version) {
+		case 'a':
+		case 'A':
+			spl_fdt_fixup_version_a(spl_image->fdt_addr);
+			break;
 
-	case 'b':
+		case 'b':
-	case 'B':
+		case 'B':
-	default:
+		default:
-		spl_fdt_fixup_version_b(spl_image->fdt_addr);
+			spl_fdt_fixup_version_b(spl_image->fdt_addr);
 		break;
+		};
+	} else {
+		pr_err("Unknown product %s\n", product_id);
 	};
 
-	/* Update the memory size which read form eeprom or DT */
+	/* Update the memory size which read from eeprom or DT */
 	fdt_fixup_memory(spl_image->fdt_addr, 0x40000000, gd->ram_size);
 }