MIPS: Netlogic: Support for XLR/XLS Fast Message Network

On XLR/XLS, the cpu cores communicate with fast on-chip devices
(e.g. network accelerator, security engine etc.) using the Fast
Messaging Network(FMN). The FMN queues and credits needs to be
configured and intialized before it can be used.

The co-processor 2 on XLR/XLS CPU cores has registers for FMN access,
and the XLR/XLS has custom instructions for sending and loading
messages.  The FMN can deliver also per-cpu interrupts when messages
are available at the CPU.

This patch adds FMN initialization, adds interrupt setup and handling,
and also provides support for sending and receiving FMN messages.

Signed-off-by: Ganesan Ramalingam <ganesanr@broadcom.com>
Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Patchwork: http://patchwork.linux-mips.org/patch/4468
Signed-off-by: John Crispin <blogic@openwrt.org>

1 files changed, 137 insertions, 0 deletions

diff --git a/arch/mips/include/asm/netlogic/mips-extns.h b/arch/mips/include/asm/netlogic/mips-extns.h
index c9f6de53d410..32ba6d95d47c 100644
--- a/arch/mips/include/asm/netlogic/mips-extns.h
+++ b/arch/mips/include/asm/netlogic/mips-extns.h
@@ -78,4 +78,141 @@ static inline int nlm_nodeid(void)
 	return (__read_32bit_c0_register($15, 1) >> 5) & 0x3;
 }
 
+static inline unsigned int nlm_core_id(void)
+{
+	return (read_c0_ebase() & 0x1c) >> 2;
+}
+
+static inline unsigned int nlm_thread_id(void)
+{
+	return read_c0_ebase() & 0x3;
+}
+
+#define __read_64bit_c2_split(source, sel)				\
+({									\
+	unsigned long long __val;					\
+	unsigned long __flags;						\
+									\
+	local_irq_save(__flags);					\
+	if (sel == 0)							\
+		__asm__ __volatile__(					\
+			".set\tmips64\n\t"				\
+			"dmfc2\t%M0, " #source "\n\t"			\
+			"dsll\t%L0, %M0, 32\n\t"			\
+			"dsra\t%M0, %M0, 32\n\t"			\
+			"dsra\t%L0, %L0, 32\n\t"			\
+			".set\tmips0\n\t"				\
+			: "=r" (__val));				\
+	else								\
+		__asm__ __volatile__(					\
+			".set\tmips64\n\t"				\
+			"dmfc2\t%M0, " #source ", " #sel "\n\t"		\
+			"dsll\t%L0, %M0, 32\n\t"			\
+			"dsra\t%M0, %M0, 32\n\t"			\
+			"dsra\t%L0, %L0, 32\n\t"			\
+			".set\tmips0\n\t"				\
+			: "=r" (__val));				\
+	local_irq_restore(__flags);					\
+									\
+	__val;								\
+})
+
+#define __write_64bit_c2_split(source, sel, val)			\
+do {									\
+	unsigned long __flags;						\
+									\
+	local_irq_save(__flags);					\
+	if (sel == 0)							\
+		__asm__ __volatile__(					\
+			".set\tmips64\n\t"				\
+			"dsll\t%L0, %L0, 32\n\t"			\
+			"dsrl\t%L0, %L0, 32\n\t"			\
+			"dsll\t%M0, %M0, 32\n\t"			\
+			"or\t%L0, %L0, %M0\n\t"				\
+			"dmtc2\t%L0, " #source "\n\t"			\
+			".set\tmips0\n\t"				\
+			: : "r" (val));					\
+	else								\
+		__asm__ __volatile__(					\
+			".set\tmips64\n\t"				\
+			"dsll\t%L0, %L0, 32\n\t"			\
+			"dsrl\t%L0, %L0, 32\n\t"			\
+			"dsll\t%M0, %M0, 32\n\t"			\
+			"or\t%L0, %L0, %M0\n\t"				\
+			"dmtc2\t%L0, " #source ", " #sel "\n\t"		\
+			".set\tmips0\n\t"				\
+			: : "r" (val));					\
+	local_irq_restore(__flags);					\
+} while (0)
+
+#define __read_32bit_c2_register(source, sel)				\
+({ uint32_t __res;							\
+	if (sel == 0)							\
+		__asm__ __volatile__(					\
+			".set\tmips32\n\t"				\
+			"mfc2\t%0, " #source "\n\t"			\
+			".set\tmips0\n\t"				\
+			: "=r" (__res));				\
+	else								\
+		__asm__ __volatile__(					\
+			".set\tmips32\n\t"				\
+			"mfc2\t%0, " #source ", " #sel "\n\t"		\
+			".set\tmips0\n\t"				\
+			: "=r" (__res));				\
+	__res;								\
+})
+
+#define __read_64bit_c2_register(source, sel)				\
+({ unsigned long long __res;						\
+	if (sizeof(unsigned long) == 4)					\
+		__res = __read_64bit_c2_split(source, sel);		\
+	else if (sel == 0)						\
+		__asm__ __volatile__(					\
+			".set\tmips64\n\t"				\
+			"dmfc2\t%0, " #source "\n\t"			\
+			".set\tmips0\n\t"				\
+			: "=r" (__res));				\
+	else								\
+		__asm__ __volatile__(					\
+			".set\tmips64\n\t"				\
+			"dmfc2\t%0, " #source ", " #sel "\n\t"		\
+			".set\tmips0\n\t"				\
+			: "=r" (__res));				\
+	__res;								\
+})
+
+#define __write_64bit_c2_register(register, sel, value)			\
+do {									\
+	if (sizeof(unsigned long) == 4)					\
+		__write_64bit_c2_split(register, sel, value);		\
+	else if (sel == 0)						\
+		__asm__ __volatile__(					\
+			".set\tmips64\n\t"				\
+			"dmtc2\t%z0, " #register "\n\t"			\
+			".set\tmips0\n\t"				\
+			: : "Jr" (value));				\
+	else								\
+		__asm__ __volatile__(					\
+			".set\tmips64\n\t"				\
+			"dmtc2\t%z0, " #register ", " #sel "\n\t"	\
+			".set\tmips0\n\t"				\
+			: : "Jr" (value));				\
+} while (0)
+
+#define __write_32bit_c2_register(reg, sel, value)			\
+({									\
+	if (sel == 0)							\
+		__asm__ __volatile__(					\
+			".set\tmips32\n\t"				\
+			"mtc2\t%z0, " #reg "\n\t"			\
+			".set\tmips0\n\t"				\
+			: : "Jr" (value));				\
+	else								\
+		__asm__ __volatile__(                                   \
+			".set\tmips32\n\t"				\
+			"mtc2\t%z0, " #reg ", " #sel "\n\t"		\
+			".set\tmips0\n\t"				\
+			: : "Jr" (value));				\
+})
+
 #endif /*_ASM_NLM_MIPS_EXTS_H */