[ARM] Kirkwood: add support for newer SoC models

Add support to the Kirkwood port for newer device models and silicon
revisions.  Instead of looking at the DEVICE_ID register, the device
version is now determined by looking at the PCI-Express device ID and
revision registers, as it is done for orion5x, and this information
is used to determine the TCLK frequency, again, as it is done for
orion5x.
Signed-off-by: Ronen Shitrit <rshitrit@marvell.com>
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>

arch/arm/mach-kirkwood/common.c

@@ -532,6 +532,12 @@ int kirkwood_tclk;
 
 int __init kirkwood_find_tclk(void)
 {
+	u32 dev, rev;
+
+	kirkwood_pcie_id(&dev, &rev);
+	if (dev == MV88F6281_DEV_ID && rev == MV88F6281_REV_A0)
+		return 200000000;
+
 	return 166666667;
 }
 
@@ -549,18 +555,37 @@ struct sys_timer kirkwood_timer = {
 /*****************************************************************************
  * General
  ****************************************************************************/
+/*
+ * Identify device ID and revision.
+ */
 static char * __init kirkwood_id(void)
 {
-	switch (readl(DEVICE_ID) & 0x3) {
-	case 0:
-		return "88F6180";
-	case 1:
-		return "88F6192";
-	case 2:
-		return "88F6281";
+	u32 dev, rev;
+
+	kirkwood_pcie_id(&dev, &rev);
+
+	if (dev == MV88F6281_DEV_ID) {
+		if (rev == MV88F6281_REV_Z0)
+			return "MV88F6281-Z0";
+		else if (rev == MV88F6281_REV_A0)
+			return "MV88F6281-A0";
+		else
+			return "MV88F6281-Rev-Unsupported";
+	} else if (dev == MV88F6192_DEV_ID) {
+		if (rev == MV88F6192_REV_Z0)
+			return "MV88F6192-Z0";
+		else if (rev == MV88F6192_REV_A0)
+			return "MV88F6192-A0";
+		else
+			return "MV88F6192-Rev-Unsupported";
+	} else if (dev == MV88F6180_DEV_ID) {
+		if (rev == MV88F6180_REV_A0)
+			return "MV88F6180-Rev-A0";
+		else
+			return "MV88F6180-Rev-Unsupported";
+	} else {
+		return "Device-Unknown";
 	}
-
-	return "unknown 88F6000 variant";
 }
 
 static int __init is_l2_writethrough(void)

arch/arm/mach-kirkwood/common.h

@@ -28,6 +28,8 @@ void kirkwood_setup_pcie_io_win(int window, u32 base, u32 size,
 void kirkwood_setup_pcie_mem_win(int window, u32 base, u32 size,
 				 int maj, int min);
 
+void kirkwood_pcie_id(u32 *dev, u32 *rev);
+
 void kirkwood_ehci_init(void);
 void kirkwood_ge00_init(struct mv643xx_eth_platform_data *eth_data);
 void kirkwood_pcie_init(void);

arch/arm/mach-kirkwood/include/mach/kirkwood.h

@@ -67,6 +67,20 @@
 #define  L2_CONFIG_REG		(BRIDGE_VIRT_BASE | 0x0128)
 #define   L2_WRITETHROUGH	0x00000010
 
+/*
+ * Supported devices and revisions.
+ */
+#define MV88F6281_DEV_ID	0x6281
+#define MV88F6281_REV_Z0	0
+#define MV88F6281_REV_A0	2
+
+#define MV88F6192_DEV_ID	0x6192
+#define MV88F6192_REV_Z0	0
+#define MV88F6192_REV_A0	2
+
+#define MV88F6180_DEV_ID	0x6180
+#define MV88F6180_REV_A0	2
+
 /*
  * Register Map
  */

arch/arm/mach-kirkwood/pcie.c

@@ -18,6 +18,12 @@
 
 #define PCIE_BASE	((void __iomem *)PCIE_VIRT_BASE)
 
+void __init kirkwood_pcie_id(u32 *dev, u32 *rev)
+{
+	*dev = orion_pcie_dev_id(PCIE_BASE);
+	*rev = orion_pcie_rev(PCIE_BASE);
+}
+
 static int pcie_valid_config(int bus, int dev)
 {
 	/*