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 2e6849b41f6..035d57bf1b7 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 cd8f79c3a28..48add848b99 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 69e7f2ef738..52f73fb47ac 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 a923aa0fd00..414e3696bdf 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 9049c0764db..21d6910d220 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 755e1bf2268..efd49492fa4 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 fbc06e55b87..37dbadadf7c 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