[MIPS] PMC MSP71xx core platform

Patch to add core platform support for the PMC-Sierra MSP71xx devices.

Signed-off-by: Marc St-Jean <Marc_St-Jean@pmc-sierra.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 236 insertions, 0 deletions

diff --git a/include/asm-mips/pmc-sierra/msp71xx/msp_regops.h b/include/asm-mips/pmc-sierra/msp71xx/msp_regops.h
new file mode 100644
index 00000000000..60a5a38dd5b
--- /dev/null
+++ b/include/asm-mips/pmc-sierra/msp71xx/msp_regops.h
@@ -0,0 +1,236 @@
+/*
+ * SMP/VPE-safe functions to access "registers" (see note).
+ *
+ * NOTES:
+* - These macros use ll/sc instructions, so it is your responsibility to
+ * ensure these are available on your platform before including this file.
+ * - The MIPS32 spec states that ll/sc results are undefined for uncached
+ * accesses. This means they can't be used on HW registers accessed
+ * through kseg1. Code which requires these macros for this purpose must
+ * front-end the registers with cached memory "registers" and have a single
+ * thread update the actual HW registers.
+ * - A maximum of 2k of code can be inserted between ll and sc. Every
+ * memory accesses between the instructions will increase the chance of
+ * sc failing and having to loop.
+ * - When using custom_read_reg32/custom_write_reg32 only perform the
+ * necessary logical operations on the register value in between these
+ * two calls. All other logic should be performed before the first call.
+  * - There is a bug on the R10000 chips which has a workaround. If you
+ * are affected by this bug, make sure to define the symbol 'R10000_LLSC_WAR'
+ * to be non-zero.  If you are using this header from within linux, you may
+ * include <asm/war.h> before including this file to have this defined
+ * appropriately for you.
+ *
+ * Copyright 2005-2007 PMC-Sierra, Inc.
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
+ *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+ *  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF USE,
+ *  DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  You should have received a copy of the  GNU General Public License along
+ *  with this program; if not, write  to the Free Software Foundation, Inc., 675
+ *  Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __ASM_REGOPS_H__
+#define __ASM_REGOPS_H__
+
+#include <linux/types.h>
+
+#include <asm/war.h>
+
+#ifndef R10000_LLSC_WAR
+#define R10000_LLSC_WAR 0
+#endif
+
+#if R10000_LLSC_WAR == 1
+#define __beqz	"beqzl	"
+#else
+#define __beqz	"beqz	"
+#endif
+
+#ifndef _LINUX_TYPES_H
+typedef unsigned int u32;
+#endif
+
+/*
+ * Sets all the masked bits to the corresponding value bits
+ */
+static inline void set_value_reg32(volatile u32 *const addr,
+					u32 const mask,
+					u32 const value)
+{
+	u32 temp;
+
+	__asm__ __volatile__(
+	"	.set	push				\n"
+	"	.set	mips3				\n"
+	"1:	ll	%0, %1	# set_value_reg32	\n"
+	"	and	%0, %2				\n"
+	"	or	%0, %3				\n"
+	"	sc	%0, %1				\n"
+	"	"__beqz"%0, 1b				\n"
+	"	nop					\n"
+	"	.set	pop				\n"
+	: "=&r" (temp), "=m" (*addr)
+	: "ir" (~mask), "ir" (value), "m" (*addr));
+}
+
+/*
+ * Sets all the masked bits to '1'
+ */
+static inline void set_reg32(volatile u32 *const addr,
+				u32 const mask)
+{
+	u32 temp;
+
+	__asm__ __volatile__(
+	"	.set	push				\n"
+	"	.set	mips3				\n"
+	"1:	ll	%0, %1		# set_reg32	\n"
+	"	or	%0, %2				\n"
+	"	sc	%0, %1				\n"
+	"	"__beqz"%0, 1b				\n"
+	"	nop					\n"
+	"	.set	pop				\n"
+	: "=&r" (temp), "=m" (*addr)
+	: "ir" (mask), "m" (*addr));
+}
+
+/*
+ * Sets all the masked bits to '0'
+ */
+static inline void clear_reg32(volatile u32 *const addr,
+				u32 const mask)
+{
+	u32 temp;
+
+	__asm__ __volatile__(
+	"	.set	push				\n"
+	"	.set	mips3				\n"
+	"1:	ll	%0, %1		# clear_reg32	\n"
+	"	and	%0, %2				\n"
+	"	sc	%0, %1				\n"
+	"	"__beqz"%0, 1b				\n"
+	"	nop					\n"
+	"	.set	pop				\n"
+	: "=&r" (temp), "=m" (*addr)
+	: "ir" (~mask), "m" (*addr));
+}
+
+/*
+ * Toggles all masked bits from '0' to '1' and '1' to '0'
+ */
+static inline void toggle_reg32(volatile u32 *const addr,
+				u32 const mask)
+{
+	u32 temp;
+
+	__asm__ __volatile__(
+	"	.set	push				\n"
+	"	.set	mips3				\n"
+	"1:	ll	%0, %1		# toggle_reg32	\n"
+	"	xor	%0, %2				\n"
+	"	sc	%0, %1				\n"
+	"	"__beqz"%0, 1b				\n"
+	"	nop					\n"
+	"	.set	pop				\n"
+	: "=&r" (temp), "=m" (*addr)
+	: "ir" (mask), "m" (*addr));
+}
+
+/*
+ * Read all masked bits others are returned as '0'
+ */
+static inline u32 read_reg32(volatile u32 *const addr,
+				u32 const mask)
+{
+	u32 temp;
+
+	__asm__ __volatile__(
+	"	.set	push				\n"
+	"	.set	noreorder			\n"
+	"	lw	%0, %1		# read		\n"
+	"	and	%0, %2		# mask		\n"
+	"	.set	pop				\n"
+	: "=&r" (temp)
+	: "m" (*addr), "ir" (mask));
+
+	return temp;
+}
+
+/*
+ * blocking_read_reg32 - Read address with blocking load
+ *
+ * Uncached writes need to be read back to ensure they reach RAM.
+ * The returned value must be 'used' to prevent from becoming a
+ * non-blocking load.
+ */
+static inline u32 blocking_read_reg32(volatile u32 *const addr)
+{
+	u32 temp;
+
+	__asm__ __volatile__(
+	"	.set	push				\n"
+	"	.set	noreorder			\n"
+	"	lw	%0, %1		# read		\n"
+	"	move	%0, %0		# block		\n"
+	"	.set	pop				\n"
+	: "=&r" (temp)
+	: "m" (*addr));
+
+	return temp;
+}
+
+/*
+ * For special strange cases only:
+ *
+ * If you need custom processing within a ll/sc loop, use the following macros
+ * VERY CAREFULLY:
+ *
+ *   u32 tmp;				<-- Define a variable to hold the data
+ *
+ *   custom_read_reg32(address, tmp);	<-- Reads the address and put the value
+ *						in the 'tmp' variable given
+ *
+ *	From here on out, you are (basicly) atomic, so don't do anything too
+ *	fancy!
+ *	Also, this code may loop if the end of this block fails to write
+ *	everything back safely due do the other CPU, so do NOT do anything
+ *	with side-effects!
+ *
+ *   custom_write_reg32(address, tmp);	<-- Writes back 'tmp' safely.
+ */
+#define custom_read_reg32(address, tmp)				\
+	__asm__ __volatile__(					\
+	"	.set	push				\n"	\
+	"	.set	mips3				\n"	\
+	"1:	ll	%0, %1	#custom_read_reg32	\n"	\
+	"	.set	pop				\n"	\
+	: "=r" (tmp), "=m" (*address)				\
+	: "m" (*address))
+
+#define custom_write_reg32(address, tmp)			\
+	__asm__ __volatile__(					\
+	"	.set	push				\n"	\
+	"	.set	mips3				\n"	\
+	"	sc	%0, %1	#custom_write_reg32	\n"	\
+	"	"__beqz"%0, 1b				\n"	\
+	"	nop					\n"	\
+	"	.set	pop				\n"	\
+	: "=&r" (tmp), "=m" (*address)				\
+	: "0" (tmp), "m" (*address))
+
+#endif  /* __ASM_REGOPS_H__ */