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>

1 files changed, 22 insertions, 0 deletions

diff --git a/arch/arm/mach-msm/board-msm7x30.c b/arch/arm/mach-msm/board-msm7x30.c
index b7a84966b711..d1e4cc83b1e6 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,