[ARM] 4503/1: nommu: Add noMMU support for ARMv7

This patch adds the necessary ifdef's to the proc-v7.S code and
defines the v7wbi_tlb_fns macro in pgtable-nommu.h

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 7cc32b7..58109ae 100644 (file)
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -377,7 +377,7 @@ config CPU_V7
        select CPU_CACHE_V7
        select CPU_CACHE_VIPT
        select CPU_CP15_MMU
-       select CPU_HAS_ASID
+       select CPU_HAS_ASID if MMU
        select CPU_COPY_V6 if MMU
        select CPU_TLB_V7 if MMU
 

diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
index 07b0269..e0acc5a 100644 (file)
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -77,6 +77,7 @@ ENTRY(cpu_v7_dcache_clean_area)
  *     - we are not using split page tables
  */
 ENTRY(cpu_v7_switch_mm)
+#ifdef CONFIG_MMU
        mov     r2, #0
        ldr     r1, [r1, #MM_CONTEXT_ID]        @ get mm->context.id
        orr     r0, r0, #TTB_RGN_OC_WB          @ mark PTWs outer cacheable, WB
@@ -86,6 +87,7 @@ ENTRY(cpu_v7_switch_mm)
        isb
        mcr     p15, 0, r1, c13, c0, 1          @ set context ID
        isb
+#endif
        mov     pc, lr
 
 /*
@@ -109,6 +111,7 @@ ENTRY(cpu_v7_switch_mm)
  *       1111   0   1   1      r/w     r/w
  */
 ENTRY(cpu_v7_set_pte_ext)
+#ifdef CONFIG_MMU
        str     r1, [r0], #-2048                @ linux version
 
        bic     r3, r1, #0x000003f0
@@ -136,6 +139,7 @@ ENTRY(cpu_v7_set_pte_ext)
 
        str     r3, [r0]
        mcr     p15, 0, r0, c7, c10, 1          @ flush_pte
+#endif
        mov     pc, lr
 
 cpu_v7_name:
@@ -169,6 +173,7 @@ __v7_setup:
        mcr     p15, 0, r10, c7, c5, 0          @ I+BTB cache invalidate
 #endif
        dsb
+#ifdef CONFIG_MMU
        mcr     p15, 0, r10, c8, c7, 0          @ invalidate I + D TLBs
        mcr     p15, 0, r10, c2, c0, 2          @ TTB control register
        orr     r4, r4, #TTB_RGN_OC_WB          @ mark PTWs outer cacheable, WB
@@ -176,11 +181,12 @@ __v7_setup:
        mcr     p15, 0, r4, c2, c0, 1           @ load TTB1
        mov     r10, #0x1f                      @ domains 0, 1 = manager
        mcr     p15, 0, r10, c3, c0, 0          @ load domain access register
-       mrc     p15, 0, r0, c1, c0, 0           @ read control register
-       ldr     r10, cr1_clear                  @ get mask for bits to clear
-       bic     r0, r0, r10                     @ clear bits them
-       ldr     r10, cr1_set                    @ get mask for bits to set
-       orr     r0, r0, r10                     @ set them
+#endif
+       adr     r5, v7_crval
+       ldmia   r5, {r5, r6}
+       mrc     p15, 0, r0, c1, c0, 0           @ read control register
+       bic     r0, r0, r5                      @ clear bits them
+       orr     r0, r0, r6                      @ set them
        mov     pc, lr                          @ return to head.S:__ret
 
        /*
@@ -189,12 +195,9 @@ __v7_setup:
         * rrrr rrrx xxx0 0101 xxxx xxxx x111 xxxx < forced
         *         0 110       0011 1.00 .111 1101 < we want
         */
-       .type   cr1_clear, #object
-       .type   cr1_set, #object
-cr1_clear:
-       .word   0x0120c302
-cr1_set:
-       .word   0x00c0387d
+       .type   v7_crval, #object
+v7_crval:
+       crval   clear=0x0120c302, mmuset=0x00c0387d, ucset=0x00c0187c
 
 __v7_setup_stack:
        .space  4 * 11                          @ 11 registers

diff --git a/include/asm-arm/pgtable-nommu.h b/include/asm-arm/pgtable-nommu.h
index 1cf14d2..b186bc8 100644 (file)
--- a/include/asm-arm/pgtable-nommu.h
+++ b/include/asm-arm/pgtable-nommu.h
@@ -103,6 +103,7 @@ extern int is_in_rom(unsigned long);
 #define v4wb_tlb_fns   (0)
 #define v4wbi_tlb_fns  (0)
 #define v6wbi_tlb_fns  (0)
+#define v7wbi_tlb_fns  (0)
 
 #define v3_user_fns    (0)
 #define v4_user_fns    (0)