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authorSimon Glass <sjg@chromium.org>2015-02-07 10:47:28 -0700
committerHans de Goede <hdegoede@redhat.com>2015-02-16 20:14:54 +0100
commite11c6c279d823dc0d2f470c5c2e3c0a9854a640f (patch)
tree31ae3d1bd015ec97d889ad6dc45baf5e1e127913 /arch/arm/cpu/armv7
parentc924e2a8036f43f2f4a8e829ecfc8e9d6e8cce63 (diff)
arm: Allow lr to be saved by board code
The link register value can be required on some boards (e.g. FEL mode on sunxi) so use a branch instruction to jump to save_boot_params() instead of a branch link. This requires a branch back to save_boot_params_ret so adjust the users to deal with this. For exynos just drop the function since it doesn't do anything. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Siarhei Siamashka <siarhei.siamashka@gmail.com> Acked-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'arch/arm/cpu/armv7')
-rw-r--r--arch/arm/cpu/armv7/exynos/spl_boot.c1
-rw-r--r--arch/arm/cpu/armv7/omap-common/lowlevel_init.S2
-rw-r--r--arch/arm/cpu/armv7/omap3/lowlevel_init.S2
-rw-r--r--arch/arm/cpu/armv7/start.S7
4 files changed, 7 insertions, 5 deletions
diff --git a/arch/arm/cpu/armv7/exynos/spl_boot.c b/arch/arm/cpu/armv7/exynos/spl_boot.c
index bc237c969f..c7f943eb6a 100644
--- a/arch/arm/cpu/armv7/exynos/spl_boot.c
+++ b/arch/arm/cpu/armv7/exynos/spl_boot.c
@@ -309,4 +309,3 @@ void board_init_r(gd_t *id, ulong dest_addr)
while (1)
;
}
-void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3) {}
diff --git a/arch/arm/cpu/armv7/omap-common/lowlevel_init.S b/arch/arm/cpu/armv7/omap-common/lowlevel_init.S
index 86c0e42174..e19c7aecec 100644
--- a/arch/arm/cpu/armv7/omap-common/lowlevel_init.S
+++ b/arch/arm/cpu/armv7/omap-common/lowlevel_init.S
@@ -19,7 +19,7 @@
ENTRY(save_boot_params)
ldr r1, =OMAP_SRAM_SCRATCH_BOOT_PARAMS
str r0, [r1]
- bx lr
+ b save_boot_params_ret
ENDPROC(save_boot_params)
ENTRY(set_pl310_ctrl_reg)
diff --git a/arch/arm/cpu/armv7/omap3/lowlevel_init.S b/arch/arm/cpu/armv7/omap3/lowlevel_init.S
index 78577b1d1c..80cb2639f6 100644
--- a/arch/arm/cpu/armv7/omap3/lowlevel_init.S
+++ b/arch/arm/cpu/armv7/omap3/lowlevel_init.S
@@ -23,7 +23,7 @@ ENTRY(save_boot_params)
ldr r5, [r0, #0x4]
and r5, r5, #0xff
str r5, [r4]
- bx lr
+ b save_boot_params_ret
ENDPROC(save_boot_params)
#endif
diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
index 70048c10ae..9b49ece2d6 100644
--- a/arch/arm/cpu/armv7/start.S
+++ b/arch/arm/cpu/armv7/start.S
@@ -31,9 +31,12 @@
*************************************************************************/
.globl reset
+ .globl save_boot_params_ret
reset:
- bl save_boot_params
+ /* Allow the board to save important registers */
+ b save_boot_params
+save_boot_params_ret:
/*
* disable interrupts (FIQ and IRQ), also set the cpu to SVC32 mode,
* except if in HYP mode already
@@ -96,7 +99,7 @@ ENDPROC(c_runtime_cpu_setup)
*
*************************************************************************/
ENTRY(save_boot_params)
- bx lr @ back to my caller
+ b save_boot_params_ret @ back to my caller
ENDPROC(save_boot_params)
.weak save_boot_params