[POWERPC] 85xx: SBC8548 - Add flash support and HW Rev reporting

The following adds local bus, flash and MTD partition nodes for
sbc8548. As well, a compatible field for the soc node, so that
of_platform_bus_probe() will pick it up.

Something that is provided through this newly added epld node
is the Hardware Revision which is now being utilized.
Signed-off-by: Jeremy McNicoll <jeremy.mcnicoll@windriver.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/boot/dts/sbc8548.dts

@@ -52,6 +52,99 @@
 		reg = <0x00000000 0x10000000>;
 	};
 
+	localbus@e0000000 {
+		#address-cells = <2>;
+		#size-cells = <1>;
+		compatible = "simple-bus";
+		reg = <0xe0000000 0x5000>;
+		interrupt-parent = <&mpic>;
+
+		ranges = <0x0 0x0 0xff800000 0x00800000		/*8MB Flash*/
+			  0x3 0x0 0xf0000000 0x04000000		/*64MB SDRAM*/
+			  0x4 0x0 0xf4000000 0x04000000 	/*64MB SDRAM*/
+			  0x5 0x0 0xf8000000 0x00b10000		/* EPLD */
+			  0x6 0x0 0xfb800000 0x04000000>;	/*64MB Flash*/
+
+
+		flash@0,0 {
+			#address-cells = <1>;
+			#size-cells = <1>;
+			compatible = "cfi-flash";
+			reg = <0x0 0x0 0x800000>;
+			bank-width = <1>;
+			device-width = <1>;
+			partition@0x0 {
+				label = "space";
+				reg = <0x00000000 0x00100000>;
+			};
+			partition@0x100000 {
+				label = "bootloader";
+				reg = <0x00100000 0x00700000>;
+				read-only;
+			};
+		};
+
+		epld@5,0 {
+			compatible = "wrs,epld-localbus";
+			#address-cells = <2>;
+			#size-cells = <1>;
+			reg = <0x5 0x0 0x00b10000>;
+			ranges = <
+				0x0 0x0 0x5 0x000000 0x1fff	/* LED */
+				0x1 0x0 0x5 0x100000 0x1fff	/* Switches */
+				0x3 0x0 0x5 0x300000 0x1fff	/* HW Rev. */
+				0xb 0x0	0x5 0xb00000 0x1fff	/* EEPROM */
+			>;
+
+			led@0,0 {
+				compatible = "led";
+				reg = <0x0 0x0 0x1fff>;
+			};
+
+			switches@1,0 {
+				compatible = "switches";
+				reg = <0x1 0x0 0x1fff>;
+			};
+
+			hw-rev@3,0 {
+				compatible = "hw-rev";
+				reg = <0x3 0x0 0x1fff>;
+			};
+
+			eeprom@b,0 {
+				compatible = "eeprom";
+				reg = <0xb 0 0x1fff>;
+			};
+
+		};
+
+		alt-flash@6,0 {
+			#address-cells = <1>;
+			#size-cells = <1>;
+			reg = <0x6 0x0 0x04000000>;
+			compatible = "cfi-flash";
+			bank-width = <4>;
+			device-width = <1>;
+			partition@0x0 {
+				label = "bootloader";
+				reg = <0x00000000 0x00100000>;
+				read-only;
+			};
+			partition@0x00100000 {
+				label = "file-system";
+				reg = <0x00100000 0x01f00000>;
+			};
+			partition@0x02000000 {
+				label = "boot-config";
+				reg = <0x02000000 0x00100000>;
+			};
+			partition@0x02100000 {
+				label = "space";
+				reg = <0x02100000 0x01f00000>;
+			};
+                };
+        };
+
 	soc8548@e0000000 {
 		#address-cells = <1>;
 		#size-cells = <1>;
@@ -59,6 +152,7 @@
 		ranges = <0x00000000 0xe0000000 0x00100000>;
 		reg = <0xe0000000 0x00001000>;	// CCSRBAR
 		bus-frequency = <0>;
+		compatible = "simple-bus";
 
 		memory-controller@2000 {
 			compatible = "fsl,8548-memory-controller";

arch/powerpc/platforms/85xx/sbc8548.c

@@ -49,6 +49,8 @@
 #include <sysdev/fsl_soc.h>
 #include <sysdev/fsl_pci.h>
 
+static int sbc_rev;
+
 static void __init sbc8548_pic_init(void)
 {
 	struct mpic *mpic;
@@ -79,6 +81,30 @@ static void __init sbc8548_pic_init(void)
 	mpic_init(mpic);
 }
 
+/* Extract the HW Rev from the EPLD on the board */
+static int __init sbc8548_hw_rev(void)
+{
+	struct device_node *np;
+	struct resource res;
+	unsigned int *rev;
+	int board_rev = 0;
+
+	np = of_find_compatible_node(NULL, NULL, "hw-rev");
+	if (np == NULL) {
+		printk("No HW-REV found in DTB.\n");
+		return -ENODEV;
+	}
+
+	of_address_to_resource(np, 0, &res);
+	of_node_put(np);
+
+	rev = ioremap(res.start,sizeof(unsigned int));
+	board_rev = (*rev) >> 28;
+	iounmap(rev);
+
+	return board_rev;
+}
+
 /*
  * Setup the architecture
  */
@@ -104,6 +130,7 @@ static void __init sbc8548_setup_arch(void)
 		}
 	}
 #endif
+	sbc_rev = sbc8548_hw_rev();
 }
 
 static void sbc8548_show_cpuinfo(struct seq_file *m)
@@ -115,7 +142,7 @@ static void sbc8548_show_cpuinfo(struct seq_file *m)
 	svid = mfspr(SPRN_SVR);
 
 	seq_printf(m, "Vendor\t\t: Wind River\n");
-	seq_printf(m, "Machine\t\t: SBC8548\n");
+	seq_printf(m, "Machine\t\t: SBC8548 v%d\n", sbc_rev);
 	seq_printf(m, "PVR\t\t: 0x%x\n", pvid);
 	seq_printf(m, "SVR\t\t: 0x%x\n", svid);
 
@@ -130,6 +157,7 @@ static void sbc8548_show_cpuinfo(struct seq_file *m)
 static struct of_device_id __initdata of_bus_ids[] = {
 	{ .name = "soc", },
 	{ .type = "soc", },
+	{ .compatible = "simple-bus", },
 	{},
 };