[PATCH 1/4] MIPS: Add platform function to fixup memory

[Jayachandran C <jchandra@broadcom.com>]

Provide a function plat_mem_fixup() that is called after memory
command line args are parsed. This can be used to fixup memory
regions including those passed thru device tree and command line.

In XLR/XLP, use this to reduce the size of the memory segments so
that prefetch will not access illegal addresses.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
---
 arch/mips/kernel/setup.c           |    4 +++
 arch/mips/netlogic/common/Makefile |    1 +
 arch/mips/netlogic/common/memory.c |   53 ++++++++++++++++++++++++++++++++++++
 arch/mips/netlogic/xlp/setup.c     |   14 ----------
 arch/mips/netlogic/xlr/setup.c     |    3 +-
 5 files changed, 59 insertions(+), 16 deletions(-)
 create mode 100644 arch/mips/netlogic/common/memory.c

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index a842154..74c5f6d 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -610,6 +610,7 @@ static void __init request_crashkernel(struct resource *res)
 static void __init arch_mem_init(char **cmdline_p)
 {
 	extern void plat_mem_setup(void);
+	extern void plat_mem_fixup(void);
 
 	/* call board setup routine */
 	plat_mem_setup();
@@ -653,6 +654,9 @@ static void __init arch_mem_init(char **cmdline_p)
 		pr_info("User-defined physical RAM map:\n");
 		print_memory_map();
 	}
+#if defined(CONFIG_CPU_XLP) || defined(CONFIG_CPU_XLR)
+	plat_mem_fixup();
+#endif
 
 	bootmem_init();
 #ifdef CONFIG_PROC_VMCORE
diff --git a/arch/mips/netlogic/common/Makefile b/arch/mips/netlogic/common/Makefile
index 362739d..44b0e7e 100644
--- a/arch/mips/netlogic/common/Makefile
+++ b/arch/mips/netlogic/common/Makefile
@@ -1,5 +1,6 @@
 obj-y				+= irq.o time.o
 obj-y				+= nlm-dma.o
 obj-y				+= reset.o
+obj-y				+= memory.o
 obj-$(CONFIG_SMP)		+= smp.o smpboot.o
 obj-$(CONFIG_EARLY_PRINTK)	+= earlycons.o
diff --git a/arch/mips/netlogic/common/memory.c b/arch/mips/netlogic/common/memory.c
new file mode 100644
index 0000000..980c102
--- /dev/null
+++ b/arch/mips/netlogic/common/memory.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2003-2014 Broadcom Corporation
+ * All Rights Reserved
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the Broadcom
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY BROADCOM ``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 BROADCOM OR CONTRIBUTORS 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+
+#include <asm/bootinfo.h>
+#include <asm/types.h>
+
+static const int prefetch_backup = 512;
+
+void __init plat_mem_fixup(void)
+{
+	int i;
+
+	/* fixup entries for prefetch */
+	for (i = 0; i < boot_mem_map.nr_map; i++) {
+		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
+			continue;
+		boot_mem_map.map[i].size -= prefetch_backup;
+	}
+}
diff --git a/arch/mips/netlogic/xlp/setup.c b/arch/mips/netlogic/xlp/setup.c
index 135a38f..bf4f6d3 100644
--- a/arch/mips/netlogic/xlp/setup.c
+++ b/arch/mips/netlogic/xlp/setup.c
@@ -65,18 +65,6 @@ static void nlm_linux_exit(void)
 		cpu_wait();
 }
 
-static void nlm_fixup_mem(void)
-{
-	const int pref_backup = 512;
-	int i;
-
-	for (i = 0; i < boot_mem_map.nr_map; i++) {
-		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
-			continue;
-		boot_mem_map.map[i].size -= pref_backup;
-	}
-}
-
 static void __init xlp_init_mem_from_bars(void)
 {
 	uint64_t map[16];
@@ -115,8 +103,6 @@ void __init plat_mem_setup(void)
 		pr_info("Using DRAM BARs for memory map.\n");
 		xlp_init_mem_from_bars();
 	}
-	/* Calculate and setup wired entries for mapped kernel */
-	nlm_fixup_mem();
 }
 
 const char *get_system_type(void)
diff --git a/arch/mips/netlogic/xlr/setup.c b/arch/mips/netlogic/xlr/setup.c
index d118b9a..714f6a3 100644
--- a/arch/mips/netlogic/xlr/setup.c
+++ b/arch/mips/netlogic/xlr/setup.c
@@ -144,7 +144,6 @@ static void prom_add_memory(void)
 {
 	struct nlm_boot_mem_map *bootm;
 	u64 start, size;
-	u64 pref_backup = 512;	/* avoid pref walking beyond end */
 	int i;
 
 	bootm = (void *)(long)nlm_prom_info.psb_mem_map;
@@ -158,7 +157,7 @@ static void prom_add_memory(void)
 		if (i == 0 && start == 0 && size == 0x0c000000)
 			size = 0x0ff00000;
 
-		add_memory_region(start, size - pref_backup, BOOT_MEM_RAM);
+		add_memory_region(start, size, BOOT_MEM_RAM);
 	}
 }
 
-- 
1.7.9.5