[PATCH 2/3] ARM: include IXP4xx "fuses" support

[Krzysztof Halasa]

Adds "fuse" functions to help determine installed IXP4xx CPU
components and to reset/disable/enable them (only NPE - network
coprocessors - can be reset and reenabled).

Signed-off-by: Krzysztof Halasa <khc@xxxxxxxxx>

diff --git a/include/asm-arm/arch-ixp4xx/ixp4xx-regs.h b/include/asm-arm/arch-ixp4xx/ixp4xx-regs.h
index 5d949d7..780c851 100644
--- a/include/asm-arm/arch-ixp4xx/ixp4xx-regs.h
+++ b/include/asm-arm/arch-ixp4xx/ixp4xx-regs.h
@@ -607,4 +607,51 @@
 
 #define DCMD_LENGTH	0x01fff		/* length mask (max = 8K - 1) */
 
+/* Fuse Bits of IXP_EXP_CFG2 */
+#define IXP4XX_FUSE_RCOMP		(1 << 0)
+#define IXP4XX_FUSE_USB_DEVICE		(1 << 1)
+#define IXP4XX_FUSE_HASH		(1 << 2)
+#define IXP4XX_FUSE_AES			(1 << 3)
+#define IXP4XX_FUSE_DES			(1 << 4)
+#define IXP4XX_FUSE_HDLC		(1 << 5)
+#define IXP4XX_FUSE_AAL			(1 << 6)
+#define IXP4XX_FUSE_HSS			(1 << 7)
+#define IXP4XX_FUSE_UTOPIA		(1 << 8)
+#define IXP4XX_FUSE_NPEB_ETH0		(1 << 9)
+#define IXP4XX_FUSE_NPEC_ETH		(1 << 10)
+#define IXP4XX_FUSE_RESET_NPEA		(1 << 11)
+#define IXP4XX_FUSE_RESET_NPEB		(1 << 12)
+#define IXP4XX_FUSE_RESET_NPEC		(1 << 13)
+#define IXP4XX_FUSE_PCI			(1 << 14)
+#define IXP4XX_FUSE_ECC_TIMESYNC	(1 << 15)
+#define IXP4XX_FUSE_UTOPIA_PHY_LIMIT	(3 << 16)
+#define IXP4XX_FUSE_USB_HOST		(1 << 18)
+#define IXP4XX_FUSE_NPEA_ETH		(1 << 19)
+#define IXP4XX_FUSE_NPEB_ETH_1_TO_3	(1 << 20)
+#define IXP4XX_FUSE_RSA			(1 << 21)
+#define IXP4XX_FUSE_XSCALE_MAX_FREQ	(3 << 22)
+#define IXP4XX_FUSE_RESERVED		(0xFF << 24)
+
+#define IXP4XX_FUSE_IXP46X_ONLY (IXP4XX_FUSE_ECC_TIMESYNC |		\
+				 IXP4XX_FUSE_USB_HOST |			\
+				 IXP4XX_FUSE_NPEA_ETH |			\
+				 IXP4XX_FUSE_NPEB_ETH_1_TO_3 |		\
+				 IXP4XX_FUSE_RSA |			\
+				 IXP4XX_FUSE_XSCALE_MAX_FREQ)
+
+static inline u32 ixp4xx_read_fuses(void)
+{
+	unsigned int fuses = ~*IXP4XX_EXP_CFG2;
+	fuses &= ~IXP4XX_FUSE_RESERVED;
+	if (!cpu_is_ixp46x())
+		fuses &= ~IXP4XX_FUSE_IXP46X_ONLY;
+
+	return fuses;
+}
+
+static inline void ixp4xx_write_fuses(u32 value)
+{
+	*IXP4XX_EXP_CFG2 = ~value;
+}
+
 #endif
-
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