ARM: 7012/1: Set proper TEXT_OFFSET for newer MSMs

MSMs post 8x50 have 2Mb at the beginning of RAM reserved for
shared memory. Since the kernel hasn't typically been told this
RAM exists, PHYS_OFFSET has been set to 0xN0200000 and the memory
atags passed to the kernel have matched. This doesn't play nicely
with things such as AUTO_ZRELADDR, which doesn't work at all, and
dynamic phys to virt, which requires an MSM specific workaround.

Work around these issues by telling the kernel RAM starts at
0xN0000000 (it actually does) and fixup the atags from the
bootloader (if necessary) to say the same. In addition, make sure
to set TEXT_OFFSET at least 2Mb beyond the start of RAM so that
the kernel doesn't end up being decompressed into shared memory.

After doing this, AUTO_ZRELADDR should work on MSM with no
problems and ARM_PATCH_PHYS_VIRT_16BIT should no longer be
necessary.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: David Brown <davidb@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

4 files changed, 72 insertions, 3 deletions

diff --git a/arch/arm/mach-msm/board-msm7x30.c b/arch/arm/mach-msm/board-msm7x30.c
index b7a84966b71..d1e4cc83b1e 100644
--- a/arch/arm/mach-msm/board-msm7x30.c
+++ b/arch/arm/mach-msm/board-msm7x30.c
@@ -24,6 +24,7 @@
 #include <linux/smsc911x.h>
 #include <linux/usb/msm_hsusb.h>
 #include <linux/clkdev.h>
+#include <linux/memblock.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
@@ -42,6 +43,21 @@
 
 extern struct sys_timer msm_timer;
 
+static void __init msm7x30_fixup(struct machine_desc *desc, struct tag *tag,
+			 char **cmdline, struct meminfo *mi)
+{
+	for (; tag->hdr.size; tag = tag_next(tag))
+		if (tag->hdr.tag == ATAG_MEM && tag->u.mem.start == 0x200000) {
+			tag->u.mem.start = 0;
+			tag->u.mem.size += SZ_2M;
+		}
+}
+
+static void __init msm7x30_reserve(void)
+{
+	memblock_remove(0x0, SZ_2M);
+}
+
 static int hsusb_phy_init_seq[] = {
 	0x30, 0x32,	/* Enable and set Pre-Emphasis Depth to 20% */
 	0x02, 0x36,	/* Disable CDR Auto Reset feature */
@@ -107,6 +123,8 @@ static void __init msm7x30_map_io(void)
 
 MACHINE_START(MSM7X30_SURF, "QCT MSM7X30 SURF")
 	.boot_params = PLAT_PHYS_OFFSET + 0x100,
+	.fixup = msm7x30_fixup,
+	.reserve = msm7x30_reserve,
 	.map_io = msm7x30_map_io,
 	.init_irq = msm7x30_init_irq,
 	.init_machine = msm7x30_init,
@@ -115,6 +133,8 @@ MACHINE_END
 
 MACHINE_START(MSM7X30_FFA, "QCT MSM7X30 FFA")
 	.boot_params = PLAT_PHYS_OFFSET + 0x100,
+	.fixup = msm7x30_fixup,
+	.reserve = msm7x30_reserve,
 	.map_io = msm7x30_map_io,
 	.init_irq = msm7x30_init_irq,
 	.init_machine = msm7x30_init,
@@ -123,6 +143,8 @@ MACHINE_END
 
 MACHINE_START(MSM7X30_FLUID, "QCT MSM7X30 FLUID")
 	.boot_params = PLAT_PHYS_OFFSET + 0x100,
+	.fixup = msm7x30_fixup,
+	.reserve = msm7x30_reserve,
 	.map_io = msm7x30_map_io,
 	.init_irq = msm7x30_init_irq,
 	.init_machine = msm7x30_init,
diff --git a/arch/arm/mach-msm/board-msm8960.c b/arch/arm/mach-msm/board-msm8960.c
index 35c7ceeb3f2..b04468e7d00 100644
--- a/arch/arm/mach-msm/board-msm8960.c
+++ b/arch/arm/mach-msm/board-msm8960.c
@@ -20,16 +20,34 @@
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/clkdev.h>
+#include <linux/memblock.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 #include <asm/hardware/gic.h>
+#include <asm/setup.h>
 
 #include <mach/board.h>
 #include <mach/msm_iomap.h>
 
 #include "devices.h"
 
+static void __init msm8960_fixup(struct machine_desc *desc, struct tag *tag,
+			 char **cmdline, struct meminfo *mi)
+{
+	for (; tag->hdr.size; tag = tag_next(tag))
+		if (tag->hdr.tag == ATAG_MEM &&
+				tag->u.mem.start == 0x40200000) {
+			tag->u.mem.start = 0x40000000;
+			tag->u.mem.size += SZ_2M;
+		}
+}
+
+static void __init msm8960_reserve(void)
+{
+	memblock_remove(0x40000000, SZ_2M);
+}
+
 static void __init msm8960_map_io(void)
 {
 	msm_map_msm8960_io();
@@ -76,6 +94,8 @@ static void __init msm8960_rumi3_init(void)
 }
 
 MACHINE_START(MSM8960_SIM, "QCT MSM8960 SIMULATOR")
+	.fixup = msm8960_fixup,
+	.reserve = msm8960_reserve,
 	.map_io = msm8960_map_io,
 	.init_irq = msm8960_init_irq,
 	.timer = &msm_timer,
@@ -83,6 +103,8 @@ MACHINE_START(MSM8960_SIM, "QCT MSM8960 SIMULATOR")
 MACHINE_END
 
 MACHINE_START(MSM8960_RUMI3, "QCT MSM8960 RUMI3")
+	.fixup = msm8960_fixup,
+	.reserve = msm8960_reserve,
 	.map_io = msm8960_map_io,
 	.init_irq = msm8960_init_irq,
 	.timer = &msm_timer,
diff --git a/arch/arm/mach-msm/board-msm8x60.c b/arch/arm/mach-msm/board-msm8x60.c
index 1163b6fd05d..9221f54778b 100644
--- a/arch/arm/mach-msm/board-msm8x60.c
+++ b/arch/arm/mach-msm/board-msm8x60.c
@@ -20,14 +20,31 @@
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/irq.h>
+#include <linux/memblock.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 #include <asm/hardware/gic.h>
+#include <asm/setup.h>
 
 #include <mach/board.h>
 #include <mach/msm_iomap.h>
 
+static void __init msm8x60_fixup(struct machine_desc *desc, struct tag *tag,
+			 char **cmdline, struct meminfo *mi)
+{
+	for (; tag->hdr.size; tag = tag_next(tag))
+		if (tag->hdr.tag == ATAG_MEM &&
+				tag->u.mem.start == 0x40200000) {
+			tag->u.mem.start = 0x40000000;
+			tag->u.mem.size += SZ_2M;
+		}
+}
+
+static void __init msm8x60_reserve(void)
+{
+	memblock_remove(0x40000000, SZ_2M);
+}
 
 static void __init msm8x60_map_io(void)
 {
@@ -65,6 +82,8 @@ static void __init msm8x60_init(void)
 }
 
 MACHINE_START(MSM8X60_RUMI3, "QCT MSM8X60 RUMI3")
+	.fixup = msm8x60_fixup,
+	.reserve = msm8x60_reserve,
 	.map_io = msm8x60_map_io,
 	.init_irq = msm8x60_init_irq,
 	.init_machine = msm8x60_init,
@@ -72,6 +91,8 @@ MACHINE_START(MSM8X60_RUMI3, "QCT MSM8X60 RUMI3")
 MACHINE_END
 
 MACHINE_START(MSM8X60_SURF, "QCT MSM8X60 SURF")
+	.fixup = msm8x60_fixup,
+	.reserve = msm8x60_reserve,
 	.map_io = msm8x60_map_io,
 	.init_irq = msm8x60_init_irq,
 	.init_machine = msm8x60_init,
@@ -79,6 +100,8 @@ MACHINE_START(MSM8X60_SURF, "QCT MSM8X60 SURF")
 MACHINE_END
 
 MACHINE_START(MSM8X60_SIM, "QCT MSM8X60 SIMULATOR")
+	.fixup = msm8x60_fixup,
+	.reserve = msm8x60_reserve,
 	.map_io = msm8x60_map_io,
 	.init_irq = msm8x60_init_irq,
 	.init_machine = msm8x60_init,
@@ -86,6 +109,8 @@ MACHINE_START(MSM8X60_SIM, "QCT MSM8X60 SIMULATOR")
 MACHINE_END
 
 MACHINE_START(MSM8X60_FFA, "QCT MSM8X60 FFA")
+	.fixup = msm8x60_fixup,
+	.reserve = msm8x60_reserve,
 	.map_io = msm8x60_map_io,
 	.init_irq = msm8x60_init_irq,
 	.init_machine = msm8x60_init,
diff --git a/arch/arm/mach-msm/include/mach/memory.h b/arch/arm/mach-msm/include/mach/memory.h
index f2f8d299ba9..58d5e7eec43 100644
--- a/arch/arm/mach-msm/include/mach/memory.h
+++ b/arch/arm/mach-msm/include/mach/memory.h
@@ -22,11 +22,11 @@
 #elif defined(CONFIG_ARCH_QSD8X50)
 #define PLAT_PHYS_OFFSET		UL(0x20000000)
 #elif defined(CONFIG_ARCH_MSM7X30)
-#define PLAT_PHYS_OFFSET		UL(0x00200000)
+#define PLAT_PHYS_OFFSET		UL(0x00000000)
 #elif defined(CONFIG_ARCH_MSM8X60)
-#define PLAT_PHYS_OFFSET		UL(0x40200000)
+#define PLAT_PHYS_OFFSET		UL(0x40000000)
 #elif defined(CONFIG_ARCH_MSM8960)
-#define PLAT_PHYS_OFFSET		UL(0x40200000)
+#define PLAT_PHYS_OFFSET		UL(0x40000000)
 #else
 #define PLAT_PHYS_OFFSET		UL(0x10000000)
 #endif