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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2006-12-13 13:33:53 -0500
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-12-13 13:33:53 -0500
commit47fd705287e9377acd2a4cee9aeeea02867d2e54 (patch)
treea0772e2655771c6ec3e8511ae3f4d689e4d6ce54 /include/asm-arm
parent02828845dda5ccf921ab2557c6ca17b6e7fc70e2 (diff)
[ARM] Provide a method to alter the control register
i.MX needs to tweak the control register to support CPU frequency scaling. Rather than have folk blindly try and change the control register by writing to it and then wondering why it doesn't work, provide a method (which is safe for UP only, and therefore only available for UP) to achieve this. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'include/asm-arm')
-rw-r--r--include/asm-arm/system.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/asm-arm/system.h b/include/asm-arm/system.h
index f60faccf01fa..e160aeb0138d 100644
--- a/include/asm-arm/system.h
+++ b/include/asm-arm/system.h
@@ -173,6 +173,26 @@ static inline void set_copro_access(unsigned int val)
173extern unsigned long cr_no_alignment; /* defined in entry-armv.S */ 173extern unsigned long cr_no_alignment; /* defined in entry-armv.S */
174extern unsigned long cr_alignment; /* defined in entry-armv.S */ 174extern unsigned long cr_alignment; /* defined in entry-armv.S */
175 175
176#ifndef CONFIG_SMP
177static inline void adjust_cr(unsigned long mask, unsigned long set)
178{
179 unsigned long flags, cr;
180
181 mask &= ~CR_A;
182
183 set &= mask;
184
185 local_irq_save(flags);
186
187 cr_no_alignment = (cr_no_alignment & ~mask) | set;
188 cr_alignment = (cr_alignment & ~mask) | set;
189
190 set_cr((get_cr() & ~mask) | set);
191
192 local_irq_restore(flags);
193}
194#endif
195
176#define UDBG_UNDEFINED (1 << 0) 196#define UDBG_UNDEFINED (1 << 0)
177#define UDBG_SYSCALL (1 << 1) 197#define UDBG_SYSCALL (1 << 1)
178#define UDBG_BADABORT (1 << 2) 198#define UDBG_BADABORT (1 << 2)