ARM: pm: preallocate a page table for suspend/resume

Preallocate a page table and setup an identity mapping for the MMU
enable code.  This means we don't have to "borrow" a page table to
do this, avoiding complexities with L2 cache coherency.

Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

7 files changed, 0 insertions, 34 deletions

diff --git a/arch/arm/mm/proc-arm920.S b/arch/arm/mm/proc-arm920.S
index 2e6849b41f66..035d57bf1b7a 100644
--- a/arch/arm/mm/proc-arm920.S
+++ b/arch/arm/mm/proc-arm920.S
@@ -400,10 +400,6 @@ ENTRY(cpu_arm920_do_resume)
         mcr     p15, 0, r5, c3, c0, 0   @ Domain ID
         mcr     p15, 0, r6, c2, c0, 0   @ TTB address
         mov     r0, r7                  @ control register
-        mov     r2, r6, lsr #14         @ get TTB0 base
-        mov     r2, r2, lsl #14
-        ldr     r3, =PMD_TYPE_SECT | PMD_SECT_BUFFERABLE | \
-                     PMD_SECT_CACHEABLE | PMD_BIT4 | PMD_SECT_AP_WRITE
         b       cpu_resume_mmu
 ENDPROC(cpu_arm920_do_resume)
 #endif
diff --git a/arch/arm/mm/proc-arm926.S b/arch/arm/mm/proc-arm926.S
index cd8f79c3a282..48add848b997 100644
--- a/arch/arm/mm/proc-arm926.S
+++ b/arch/arm/mm/proc-arm926.S
@@ -415,10 +415,6 @@ ENTRY(cpu_arm926_do_resume)
         mcr     p15, 0, r5, c3, c0, 0   @ Domain ID
         mcr     p15, 0, r6, c2, c0, 0   @ TTB address
         mov     r0, r7                  @ control register
-        mov     r2, r6, lsr #14         @ get TTB0 base
-        mov     r2, r2, lsl #14
-        ldr     r3, =PMD_TYPE_SECT | PMD_SECT_BUFFERABLE | \
-                     PMD_SECT_CACHEABLE | PMD_BIT4 | PMD_SECT_AP_WRITE
         b       cpu_resume_mmu
 ENDPROC(cpu_arm926_do_resume)
 #endif
diff --git a/arch/arm/mm/proc-sa1100.S b/arch/arm/mm/proc-sa1100.S
index 69e7f2ef7384..52f73fb47ac1 100644
--- a/arch/arm/mm/proc-sa1100.S
+++ b/arch/arm/mm/proc-sa1100.S
@@ -192,10 +192,6 @@ ENTRY(cpu_sa1100_do_resume)
         mcr     p15, 0, r5, c2, c0, 0           @ translation table base addr
         mcr     p15, 0, r6, c13, c0, 0          @ PID
         mov     r0, r7                          @ control register
-        mov     r2, r5, lsr #14                 @ get TTB0 base
-        mov     r2, r2, lsl #14
-        ldr     r3, =PMD_TYPE_SECT | PMD_SECT_BUFFERABLE | \
-                     PMD_SECT_CACHEABLE | PMD_SECT_AP_WRITE
         b       cpu_resume_mmu
 ENDPROC(cpu_sa1100_do_resume)
 #endif
diff --git a/arch/arm/mm/proc-v6.S b/arch/arm/mm/proc-v6.S
index a923aa0fd00d..414e3696bdf7 100644
--- a/arch/arm/mm/proc-v6.S
+++ b/arch/arm/mm/proc-v6.S
@@ -161,14 +161,8 @@ ENTRY(cpu_v6_do_resume)
         mcr     p15, 0, ip, c2, c0, 2   @ TTB control register
         mcr     p15, 0, ip, c7, c5, 4   @ ISB
         mov     r0, r11                 @ control register
-        mov     r2, r7, lsr #14         @ get TTB0 base
-        mov     r2, r2, lsl #14
-        ldr     r3, cpu_resume_l1_flags
         b       cpu_resume_mmu
 ENDPROC(cpu_v6_do_resume)
-cpu_resume_l1_flags:
-        ALT_SMP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_FLAGS_SMP)
-        ALT_UP(.long  PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_FLAGS_UP)
 #endif
 
         string  cpu_v6_name, "ARMv6-compatible processor"
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
index 9049c0764db2..21d6910d2208 100644
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -259,14 +259,8 @@ ENTRY(cpu_v7_do_resume)
         isb
         dsb
         mov     r0, r9                  @ control register
-        mov     r2, r7, lsr #14         @ get TTB0 base
-        mov     r2, r2, lsl #14
-        ldr     r3, cpu_resume_l1_flags
         b       cpu_resume_mmu
 ENDPROC(cpu_v7_do_resume)
-cpu_resume_l1_flags:
-        ALT_SMP(.long PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_FLAGS_SMP)
-        ALT_UP(.long  PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_FLAGS_UP)
 #endif
 
         __CPUINIT
diff --git a/arch/arm/mm/proc-xsc3.S b/arch/arm/mm/proc-xsc3.S
index 755e1bf22681..efd49492fa4d 100644
--- a/arch/arm/mm/proc-xsc3.S
+++ b/arch/arm/mm/proc-xsc3.S
@@ -435,13 +435,7 @@ ENTRY(cpu_xsc3_do_resume)
         mcr     p15, 0, r7, c3, c0, 0   @ domain ID
         mcr     p15, 0, r8, c2, c0, 0   @ translation table base addr
         mcr     p15, 0, r9, c1, c0, 1   @ auxiliary control reg
-
-        @ temporarily map resume_turn_on_mmu into the page table,
-        @ otherwise prefetch abort occurs after MMU is turned on
         mov     r0, r10                 @ control register
-        mov     r2, r8, lsr #14         @ get TTB0 base
-        mov     r2, r2, lsl #14
-        ldr     r3, =0x542e             @ section flags
         b       cpu_resume_mmu
 ENDPROC(cpu_xsc3_do_resume)
 #endif
diff --git a/arch/arm/mm/proc-xscale.S b/arch/arm/mm/proc-xscale.S
index fbc06e55b87a..37dbadadf7c4 100644
--- a/arch/arm/mm/proc-xscale.S
+++ b/arch/arm/mm/proc-xscale.S
@@ -548,10 +548,6 @@ ENTRY(cpu_xscale_do_resume)
         mcr     p15, 0, r8, c2, c0, 0   @ translation table base addr
         mcr     p15, 0, r9, c1, c1, 0   @ auxiliary control reg
         mov     r0, r10                 @ control register
-        mov     r2, r8, lsr #14         @ get TTB0 base
-        mov     r2, r2, lsl #14
-        ldr     r3, =PMD_TYPE_SECT | PMD_SECT_BUFFERABLE | \
-                     PMD_SECT_CACHEABLE | PMD_SECT_AP_WRITE
         b       cpu_resume_mmu
 ENDPROC(cpu_xscale_do_resume)
 #endif