Commit 0b29de4a authored by Lennert Buytenhek's avatar Lennert Buytenhek Committed by Russell King

[ARM] 3824/1: iop3xx: add cp6 enable/disable macros

Add macros to enable and disable access to CP6.  On the iop3xx, enabling
CP6 access unfortunately also enables access to that coprocessor from
unprivileged code, so we need these macros to enable and disable access
to the coprocessor whenever we need to access it.
Signed-off-by: default avatarLennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 863753a8
...@@ -132,6 +132,34 @@ unsigned long iop3xx_gettimeoffset(void); ...@@ -132,6 +132,34 @@ unsigned long iop3xx_gettimeoffset(void);
extern struct platform_device iop3xx_i2c0_device; extern struct platform_device iop3xx_i2c0_device;
extern struct platform_device iop3xx_i2c1_device; extern struct platform_device iop3xx_i2c1_device;
extern inline void iop3xx_cp6_enable(void)
{
u32 temp;
asm volatile (
"mrc p15, 0, %0, c15, c1, 0\n\t"
"orr %0, %0, #(1 << 6)\n\t"
"mcr p15, 0, %0, c15, c1, 0\n\t"
"mrc p15, 0, %0, c15, c1, 0\n\t"
"mov %0, %0\n\t"
"sub pc, pc, #4\n\t"
: "=r" (temp) );
}
extern inline void iop3xx_cp6_disable(void)
{
u32 temp;
asm volatile (
"mrc p15, 0, %0, c15, c1, 0\n\t"
"bic %0, %0, #(1 << 6)\n\t"
"mcr p15, 0, %0, c15, c1, 0\n\t"
"mrc p15, 0, %0, c15, c1, 0\n\t"
"mov %0, %0\n\t"
"sub pc, pc, #4\n\t"
: "=r" (temp) );
}
#endif #endif
......
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