[ARM] nommu: provide a way for correct control register value selection

Most MMU-based CPUs have a restriction on the setting of the data cache
enable and mmu enable bits in the control register, whereby if the data
cache is enabled, the MMU must also be enabled.  Enabling the data
cache without the MMU is an invalid combination.

However, there are CPUs where the data cache can be enabled without the
MMU.

In order to allow these CPUs to take advantage of that, provide a
method whereby each proc-*.S file defines the control regsiter value
for use with nommu (with the MMU disabled.)  Later on, when we add
support for enabling the MMU on these devices, we can adjust the
"crval" macro to also enable the data cache for nommu.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/mm/proc-arm1020.S b/arch/arm/mm/proc-arm1020.S
index b9abbaf..a1b85d9 100644 (file)
--- a/arch/arm/mm/proc-arm1020.S
+++ b/arch/arm/mm/proc-arm1020.S
@@ -440,11 +440,12 @@ __arm1020_setup:
 #ifdef CONFIG_MMU
        mcr     p15, 0, r0, c8, c7              @ invalidate I,D TLBs on v4
 #endif
+
+       adr     r5, arm1020_crval
+       ldmia   r5, {r5, r6}
        mrc     p15, 0, r0, c1, c0              @ get control register v4
-       ldr     r5, arm1020_cr1_clear
        bic     r0, r0, r5
-       ldr     r5, arm1020_cr1_set
-       orr     r0, r0, r5
+       orr     r0, r0, r6
 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
        orr     r0, r0, #0x4000                 @ .R.. .... .... ....
 #endif
@@ -456,12 +457,9 @@ __arm1020_setup:
         * .RVI ZFRS BLDP WCAM
         * .011 1001 ..11 0101
         */
-       .type   arm1020_cr1_clear, #object
-       .type   arm1020_cr1_set, #object
-arm1020_cr1_clear:
-       .word   0x593f
-arm1020_cr1_set:
-       .word   0x3935
+       .type   arm1020_crval, #object
+arm1020_crval:
+       crval   clear=0x0000593f, mmuset=0x00003935, ucset=0x00001930
 
        __INITDATA
 

diff --git a/arch/arm/mm/proc-arm1020e.S b/arch/arm/mm/proc-arm1020e.S
index 8c7e25f..6130930 100644 (file)
--- a/arch/arm/mm/proc-arm1020e.S
+++ b/arch/arm/mm/proc-arm1020e.S
@@ -422,11 +422,11 @@ __arm1020e_setup:
 #ifdef CONFIG_MMU
        mcr     p15, 0, r0, c8, c7              @ invalidate I,D TLBs on v4
 #endif
+       adr     r5, arm1020e_crval
+       ldmia   r5, {r5, r6}
        mrc     p15, 0, r0, c1, c0              @ get control register v4
-       ldr     r5, arm1020e_cr1_clear
        bic     r0, r0, r5
-       ldr     r5, arm1020e_cr1_set
-       orr     r0, r0, r5
+       orr     r0, r0, r6
 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
        orr     r0, r0, #0x4000                 @ .R.. .... .... ....
 #endif
@@ -438,12 +438,9 @@ __arm1020e_setup:
         * .RVI ZFRS BLDP WCAM
         * .011 1001 ..11 0101
         */
-       .type   arm1020e_cr1_clear, #object
-       .type   arm1020e_cr1_set, #object
-arm1020e_cr1_clear:
-       .word   0x5f3f
-arm1020e_cr1_set:
-       .word   0x3935
+       .type   arm1020e_crval, #object
+arm1020e_crval:
+       crval   clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001930
 
        __INITDATA
 

diff --git a/arch/arm/mm/proc-arm1022.S b/arch/arm/mm/proc-arm1022.S
index 92218e6..e435974 100644 (file)
--- a/arch/arm/mm/proc-arm1022.S
+++ b/arch/arm/mm/proc-arm1022.S
@@ -404,11 +404,11 @@ __arm1022_setup:
 #ifdef CONFIG_MMU
        mcr     p15, 0, r0, c8, c7              @ invalidate I,D TLBs on v4
 #endif
+       adr     r5, arm1022_crval
+       ldmia   r5, {r5, r6}
        mrc     p15, 0, r0, c1, c0              @ get control register v4
-       ldr     r5, arm1022_cr1_clear
        bic     r0, r0, r5
-       ldr     r5, arm1022_cr1_set
-       orr     r0, r0, r5
+       orr     r0, r0, r6
 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
        orr     r0, r0, #0x4000                 @ .R..............
 #endif
@@ -421,12 +421,9 @@ __arm1022_setup:
         * .011 1001 ..11 0101
         * 
         */
-       .type   arm1022_cr1_clear, #object
-       .type   arm1022_cr1_set, #object
-arm1022_cr1_clear:
-       .word   0x7f3f
-arm1022_cr1_set:
-       .word   0x3935
+       .type   arm1022_crval, #object
+arm1022_crval:
+       crval   clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001930
 
        __INITDATA
 

diff --git a/arch/arm/mm/proc-arm1026.S b/arch/arm/mm/proc-arm1026.S
index 2796c8e..85d8fb0 100644 (file)
--- a/arch/arm/mm/proc-arm1026.S
+++ b/arch/arm/mm/proc-arm1026.S
@@ -399,11 +399,11 @@ __arm1026_setup:
        mov     r0, #4                          @ explicitly disable writeback
        mcr     p15, 7, r0, c15, c0, 0
 #endif
+       adr     r5, arm1026_crval
+       ldmia   r5, {r5, r6}
        mrc     p15, 0, r0, c1, c0              @ get control register v4
-       ldr     r5, arm1026_cr1_clear
        bic     r0, r0, r5
-       ldr     r5, arm1026_cr1_set
-       orr     r0, r0, r5
+       orr     r0, r0, r6
 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
        orr     r0, r0, #0x4000                 @ .R.. .... .... ....
 #endif
@@ -416,12 +416,9 @@ __arm1026_setup:
         * .011 1001 ..11 0101
         * 
         */
-       .type   arm1026_cr1_clear, #object
-       .type   arm1026_cr1_set, #object
-arm1026_cr1_clear:
-       .word   0x7f3f
-arm1026_cr1_set:
-       .word   0x3935
+       .type   arm1026_crval, #object
+arm1026_crval:
+       crval   clear=0x00007f3f, mmuset=0x00003935, ucset=0x00001934
 
        __INITDATA
 

diff --git a/arch/arm/mm/proc-arm720.S b/arch/arm/mm/proc-arm720.S
index 8610246..b22bc3a 100644 (file)
--- a/arch/arm/mm/proc-arm720.S
+++ b/arch/arm/mm/proc-arm720.S
@@ -169,11 +169,11 @@ __arm720_setup:
 #ifdef CONFIG_MMU
        mcr     p15, 0, r0, c8, c7, 0           @ flush TLB (v4)
 #endif
+       adr     r5, arm720_crval
+       ldmia   r5, {r5, r6}
        mrc     p15, 0, r0, c1, c0              @ get control register
-       ldr     r5, arm720_cr1_clear
        bic     r0, r0, r5
-       ldr     r5, arm720_cr1_set
-       orr     r0, r0, r5
+       orr     r0, r0, r6
        mov     pc, lr                          @ __ret (head.S)
        .size   __arm720_setup, . - __arm720_setup
 
@@ -183,12 +183,9 @@ __arm720_setup:
         * ..1. 1001 ..11 1101
         * 
         */
-       .type   arm720_cr1_clear, #object
-       .type   arm720_cr1_set, #object
-arm720_cr1_clear:
-       .word   0x2f3f
-arm720_cr1_set:
-       .word   0x213d
+       .type   arm720_crval, #object
+arm720_crval:
+       crval   clear=0x00002f3f, mmuset=0x0000213d, ucset=0x00000130
 
                __INITDATA
 

diff --git a/arch/arm/mm/proc-arm920.S b/arch/arm/mm/proc-arm920.S
index 02af3e2..e647c3a 100644 (file)
--- a/arch/arm/mm/proc-arm920.S
+++ b/arch/arm/mm/proc-arm920.S
@@ -391,11 +391,11 @@ __arm920_setup:
 #ifdef CONFIG_MMU
        mcr     p15, 0, r0, c8, c7              @ invalidate I,D TLBs on v4
 #endif
+       adr     r5, arm920_crval
+       ldmia   r5, {r5, r6}
        mrc     p15, 0, r0, c1, c0              @ get control register v4
-       ldr     r5, arm920_cr1_clear
        bic     r0, r0, r5
-       ldr     r5, arm920_cr1_set
-       orr     r0, r0, r5
+       orr     r0, r0, r6
        mov     pc, lr
        .size   __arm920_setup, . - __arm920_setup
 
@@ -405,12 +405,9 @@ __arm920_setup:
         * ..11 0001 ..11 0101
         * 
         */
-       .type   arm920_cr1_clear, #object
-       .type   arm920_cr1_set, #object
-arm920_cr1_clear:
-       .word   0x3f3f
-arm920_cr1_set:
-       .word   0x3135
+       .type   arm920_crval, #object
+arm920_crval:
+       crval   clear=0x00003f3f, mmuset=0x00003135, ucset=0x00001130
 
        __INITDATA
 

diff --git a/arch/arm/mm/proc-arm922.S b/arch/arm/mm/proc-arm922.S
index 33dae49..0d23769 100644 (file)
--- a/arch/arm/mm/proc-arm922.S
+++ b/arch/arm/mm/proc-arm922.S
@@ -395,11 +395,11 @@ __arm922_setup:
 #ifdef CONFIG_MMU
        mcr     p15, 0, r0, c8, c7              @ invalidate I,D TLBs on v4
 #endif
+       adr     r5, arm922_crval
+       ldmia   r5, {r5, r6}
        mrc     p15, 0, r0, c1, c0              @ get control register v4
-       ldr     r5, arm922_cr1_clear
        bic     r0, r0, r5
-       ldr     r5, arm922_cr1_set
-       orr     r0, r0, r5
+       orr     r0, r0, r6
        mov     pc, lr
        .size   __arm922_setup, . - __arm922_setup
 
@@ -409,12 +409,9 @@ __arm922_setup:
         * ..11 0001 ..11 0101
         * 
         */
-       .type   arm922_cr1_clear, #object
-       .type   arm922_cr1_set, #object
-arm922_cr1_clear:
-       .word   0x3f3f
-arm922_cr1_set:
-       .word   0x3135
+       .type   arm922_crval, #object
+arm922_crval:
+       crval   clear=0x00003f3f, mmuset=0x00003135, ucset=0x00001130
 
        __INITDATA
 

diff --git a/arch/arm/mm/proc-arm925.S b/arch/arm/mm/proc-arm925.S
index aaa9f98..07f2a88 100644 (file)
--- a/arch/arm/mm/proc-arm925.S
+++ b/arch/arm/mm/proc-arm925.S
@@ -455,11 +455,10 @@ __arm925_setup:
        mcr     p15, 7, r0, c15, c0, 0
 #endif
 
+       adr     r5, {r5, r6}
        mrc     p15, 0, r0, c1, c0              @ get control register v4
-       ldr     r5, arm925_cr1_clear
        bic     r0, r0, r5
-       ldr     r5, arm925_cr1_set
-       orr     r0, r0, r5
+       orr     r0, r0, r6
 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
        orr     r0, r0, #0x4000                 @ .1.. .... .... ....
 #endif
@@ -472,12 +471,9 @@ __arm925_setup:
         * .011 0001 ..11 1101
         * 
         */
-       .type   arm925_cr1_clear, #object
-       .type   arm925_cr1_set, #object
-arm925_cr1_clear:
-       .word   0x7f3f
-arm925_cr1_set:
-       .word   0x313d
+       .type   arm925_crval, #object
+arm925_crval:
+       crval   clear=0x00007f3f, mmuset=0x0000313d, ucset=0x00001130
 
        __INITDATA
 

diff --git a/arch/arm/mm/proc-arm926.S b/arch/arm/mm/proc-arm926.S
index ce246dd..77e5837 100644 (file)
--- a/arch/arm/mm/proc-arm926.S
+++ b/arch/arm/mm/proc-arm926.S
@@ -404,11 +404,11 @@ __arm926_setup:
        mcr     p15, 7, r0, c15, c0, 0
 #endif 
 
+       adr     r5, arm926_crval
+       ldmia   r5, {r5, r6}
        mrc     p15, 0, r0, c1, c0              @ get control register v4
-       ldr     r5, arm926_cr1_clear
        bic     r0, r0, r5
-       ldr     r5, arm926_cr1_set
-       orr     r0, r0, r5
+       orr     r0, r0, r6
 #ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
        orr     r0, r0, #0x4000                 @ .1.. .... .... ....
 #endif
@@ -421,12 +421,9 @@ __arm926_setup:
         * .011 0001 ..11 0101
         * 
         */
-       .type   arm926_cr1_clear, #object
-       .type   arm926_cr1_set, #object
-arm926_cr1_clear:
-       .word   0x7f3f
-arm926_cr1_set:
-       .word   0x3135
+       .type   arm926_crval, #object
+arm926_crval:
+       crval   clear=0x00007f3f, mmuset=0x00003135, ucset=0x00001134
 
        __INITDATA
 

diff --git a/arch/arm/mm/proc-macros.S b/arch/arm/mm/proc-macros.S
index 7cfc260..9e2c89e 100644 (file)
--- a/arch/arm/mm/proc-macros.S
+++ b/arch/arm/mm/proc-macros.S
@@ -49,3 +49,13 @@
        .macro  asid, rd, rn
        and     \rd, \rn, #255
        .endm
+
+       .macro  crval, clear, mmuset, ucset
+#ifdef CONFIG_MMU
+       .word   \clear
+       .word   \mmuset
+#else
+       .word   \clear
+       .word   \ucset
+#endif
+       .endm

diff --git a/arch/arm/mm/proc-sa110.S b/arch/arm/mm/proc-sa110.S
index 5a760a2..eeacf60 100644 (file)
--- a/arch/arm/mm/proc-sa110.S
+++ b/arch/arm/mm/proc-sa110.S
@@ -185,11 +185,12 @@ __sa110_setup:
 #ifdef CONFIG_MMU
        mcr     p15, 0, r10, c8, c7             @ invalidate I,D TLBs on v4
 #endif
+
+       adr     r5, sa110_crval
+       ldmia   r5, {r5, r6}
        mrc     p15, 0, r0, c1, c0              @ get control register v4
-       ldr     r5, sa110_cr1_clear
        bic     r0, r0, r5
-       ldr     r5, sa110_cr1_set
-       orr     r0, r0, r5
+       orr     r0, r0, r6
        mov     pc, lr
        .size   __sa110_setup, . - __sa110_setup
 
@@ -199,12 +200,9 @@ __sa110_setup:
         * ..01 0001 ..11 1101
         * 
         */
-       .type   sa110_cr1_clear, #object
-       .type   sa110_cr1_set, #object
-sa110_cr1_clear:
-       .word   0x3f3f
-sa110_cr1_set:
-       .word   0x113d
+       .type   sa110_crval, #object
+sa110_crval:
+       crval   clear=0x00003f3f, mmuset=0x0000113d, ucset=0x00001130
 
        __INITDATA
 

diff --git a/arch/arm/mm/proc-sa1100.S b/arch/arm/mm/proc-sa1100.S
index 0a2107a..b43696c 100644 (file)
--- a/arch/arm/mm/proc-sa1100.S
+++ b/arch/arm/mm/proc-sa1100.S
@@ -198,11 +198,11 @@ __sa1100_setup:
 #ifdef CONFIG_MMU
        mcr     p15, 0, r0, c8, c7              @ invalidate I,D TLBs on v4
 #endif
+       adr     r5, sa1100_crval
+       ldmia   r5, {r5, r6}
        mrc     p15, 0, r0, c1, c0              @ get control register v4
-       ldr     r5, sa1100_cr1_clear
        bic     r0, r0, r5
-       ldr     r5, sa1100_cr1_set
-       orr     r0, r0, r5
+       orr     r0, r0, r6
        mov     pc, lr
        .size   __sa1100_setup, . - __sa1100_setup
 
@@ -212,12 +212,9 @@ __sa1100_setup:
         * ..11 0001 ..11 1101
         * 
         */
-       .type   sa1100_cr1_clear, #object
-       .type   sa1100_cr1_set, #object
-sa1100_cr1_clear:
-       .word   0x3f3f
-sa1100_cr1_set:
-       .word   0x313d
+       .type   sa1100_crval, #object
+sa1100_crval:
+       crval   clear=0x00003f3f, mmuset=0x0000313d, ucset=0x00001130
 
        __INITDATA
 

diff --git a/arch/arm/mm/proc-v6.S b/arch/arm/mm/proc-v6.S
index ca13d4d..f0075f1 100644 (file)
--- a/arch/arm/mm/proc-v6.S
+++ b/arch/arm/mm/proc-v6.S
@@ -212,11 +212,11 @@ __v6_setup:
        orr     r0, r0, #(0xf << 20)
        mcr     p15, 0, r0, c1, c0, 2           @ Enable full access to VFP
 #endif
+       adr     r5, v6_crval
+       ldmia   r5, {r5, r6}
        mrc     p15, 0, r0, c1, c0, 0           @ read control register
-       ldr     r5, v6_cr1_clear                @ get mask for bits to clear
        bic     r0, r0, r5                      @ clear bits them
-       ldr     r5, v6_cr1_set                  @ get mask for bits to set
-       orr     r0, r0, r5                      @ set them
+       orr     r0, r0, r6                      @ set them
        mov     pc, lr                          @ return to head.S:__ret
 
        /*
@@ -225,12 +225,9 @@ __v6_setup:
         * rrrr rrrx xxx0 0101 xxxx xxxx x111 xxxx < forced
         *         0 110       0011 1.00 .111 1101 < we want
         */
-       .type   v6_cr1_clear, #object
-       .type   v6_cr1_set, #object
-v6_cr1_clear:
-       .word   0x01e0fb7f
-v6_cr1_set:
-       .word   0x00c0387d
+       .type   v6_crval, #object
+v6_crval:
+       crval   clear=0x01e0fb7f, mmuset=0x00c0387d, ucset=0x00c0187c
 
        .type   v6_processor_functions, #object
 ENTRY(v6_processor_functions)

diff --git a/arch/arm/mm/proc-xsc3.S b/arch/arm/mm/proc-xsc3.S
index 8d32e21..2303790 100644 (file)
--- a/arch/arm/mm/proc-xsc3.S
+++ b/arch/arm/mm/proc-xsc3.S
@@ -426,23 +426,26 @@ __xsc3_setup:
        orr     r0, r0, #(1 << 10)              @ enable L2 for LLR cache
 #endif
        mcr     p15, 0, r0, c1, c0, 1           @ set auxiliary control reg
+
+       adr     r5, xsc3_crval
+       ldmia   r5, {r5, r6}
        mrc     p15, 0, r0, c1, c0, 0           @ get control register
-       bic     r0, r0, #0x0002                 @ .... .... .... ..A.
-       orr     r0, r0, #0x0005                 @ .... .... .... .C.M
+       bic     r0, r0, r5                      @ .... .... .... ..A.
+       orr     r0, r0, r6                      @ .... .... .... .C.M
 #if BTB_ENABLE
-       bic     r0, r0, #0x0200                 @ .... ..R. .... ....
-       orr     r0, r0, #0x3900                 @ ..VI Z..S .... ....
-#else
-       bic     r0, r0, #0x0a00                 @ .... Z.R. .... ....
-       orr     r0, r0, #0x3100                 @ ..VI ...S .... ....
+       orr     r0, r0, #0x00000800             @ ..VI Z..S .... ....
 #endif
 #if L2_CACHE_ENABLE
-       orr     r0, r0, #0x4000000              @ L2 enable
+       orr     r0, r0, #0x04000000             @ L2 enable
 #endif
        mov     pc, lr
 
        .size   __xsc3_setup, . - __xsc3_setup
 
+       .type   xsc3_crval, #object
+xsc3_crval:
+       crval   clear=0x04003b02, mmuset=0x00003105, ucset=0x00001100
+
        __INITDATA
 
 /*

diff --git a/arch/arm/mm/proc-xscale.S b/arch/arm/mm/proc-xscale.S
index 29bcc4d..1ad0c88 100644 (file)
--- a/arch/arm/mm/proc-xscale.S
+++ b/arch/arm/mm/proc-xscale.S
@@ -475,11 +475,12 @@ __xscale_setup:
        orr     r0, r0, #1 << 6                 @ cp6 for IOP3xx and Bulverde
        orr     r0, r0, #1 << 13                @ Its undefined whether this
        mcr     p15, 0, r0, c15, c1, 0          @ affects USR or SVC modes
+
+       adr     r5, xscale_crval
+       ldmia   r5, {r5, r6}
        mrc     p15, 0, r0, c1, c0, 0           @ get control register
-       ldr     r5, xscale_cr1_clear
        bic     r0, r0, r5
-       ldr     r5, xscale_cr1_set
-       orr     r0, r0, r5
+       orr     r0, r0, r6
        mov     pc, lr
        .size   __xscale_setup, . - __xscale_setup
 
@@ -489,12 +490,9 @@ __xscale_setup:
         * ..11 1.01 .... .101
         * 
         */
-       .type   xscale_cr1_clear, #object
-       .type   xscale_cr1_set, #object
-xscale_cr1_clear:
-       .word   0x3b07
-xscale_cr1_set:
-       .word   0x3905
+       .type   xscale_crval, #object
+xscale_crval:
+       crval   clear=0x00003b07, mmuset=0x00003905, ucset=0x00001900
 
        __INITDATA