diff options
| author |   Dietmar Eggemann <dietmar.eggemann@arm.com> | 2012-10-14 20:23:04 +0100 |
|---|---|---|
| committer |   Will Deacon <will.deacon@arm.com> | 2013-01-10 21:13:05 +0000 |
| commit | 02051ead976d854df1de726841c4a646826ec860 (patch) | |
| tree | 6a2db29823171f8236b650361e97653481bc82b6 /arch/arm/include/asm/cti.h | |
| parent | Linux 3.8-rc3 (diff) | |
| download | linux-dev-02051ead976d854df1de726841c4a646826ec860.tar.xz linux-dev-02051ead976d854df1de726841c4a646826ec860.zip | |
ARM: coresight: common definition for (OS) Lock Access Register key value
Coresight components and debug are using a common lock control mechansim.
Writing 0xC5ACCE55 to the Lock Access Register (LAR) in case of a coresight
components enables further access to the coresight device registers. Writing
any other value to it removes the write access.
Writing 0xC5ACCE55 to the OS Lock Access Register (OSLAR) in case of debug
locks the debug register for further access to the debug registers. Writing
any other value to it unlocks the debug registers.
Unfortunately, the existing coresight code uses the terms lock and unlock the
other way around. Unlocking stands for enabling write access and locking for
removing write access.
That is why the definition of the LAR and OSLAR key value has been changed to
CS_LAR_KEY.
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm/include/asm/cti.h')
| -rw-r--r-- | arch/arm/include/asm/cti.h | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/arch/arm/include/asm/cti.h b/arch/arm/include/asm/cti.h index f2e5cad3f306..2381199acb7d 100644 --- a/arch/arm/include/asm/cti.h +++ b/arch/arm/include/asm/cti.h @@ -2,6 +2,7 @@ #define __ASMARM_CTI_H #include <asm/io.h> +#include <asm/hardware/coresight.h> /* The registers' definition is from section 3.2 of * Embedded Cross Trigger Revision: r0p0 @@ -35,11 +36,6 @@ #define LOCKACCESS 0xFB0 #define LOCKSTATUS 0xFB4 -/* write this value to LOCKACCESS will unlock the module, and - * other value will lock the module - */ -#define LOCKCODE 0xC5ACCE55 - /** * struct cti - cross trigger interface struct * @base: mapped virtual address for the cti base @@ -146,7 +142,7 @@ static inline void cti_irq_ack(struct cti *cti) */ static inline void cti_unlock(struct cti *cti) { - __raw_writel(LOCKCODE, cti->base + LOCKACCESS); + __raw_writel(CS_LAR_KEY, cti->base + LOCKACCESS); } /** @@ -158,6 +154,6 @@ static inline void cti_unlock(struct cti *cti) */ static inline void cti_lock(struct cti *cti) { - __raw_writel(~LOCKCODE, cti->base + LOCKACCESS); + __raw_writel(~CS_LAR_KEY, cti->base + LOCKACCESS); } #endif |