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author | Hartley Sweeten <hartleys@visionengravers.com> | 2009-07-08 02:00:49 +0100 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-07-09 16:10:51 +0100 |
commit | 02239f0a4264608686cc0015d906c7b2dead89df (patch) | |
tree | 85e23dd5af1b1d9a00466af408827e384049c239 /arch/arm/mach-ep93xx/include/mach/platform.h | |
parent | f04989bbf4a40077dc7ddcc3dccde11a5f3e91f2 (diff) | |
download | linux-3.10-02239f0a4264608686cc0015d906c7b2dead89df.tar.gz linux-3.10-02239f0a4264608686cc0015d906c7b2dead89df.tar.bz2 linux-3.10-02239f0a4264608686cc0015d906c7b2dead89df.zip |
[ARM] 5577/2: ep93xx: syscon locked register functions
Add core functions to handle writes to the ep93xx software locked
registers.
There are a number of registers in the EP93xx System Controller
that require a write to the software lock register before they
can be updated. This patch adds a number of exported functions
to the ep93xx core that handle this access.
The software locked clock divider registers, VidClkDiv, MIRClkDiv,
I2SClkDiv and KeyTchClkDiv would typically involve writing a
specific value to the register. To support this the
ep93xx_syscon_swlocked_write() function is provided.
For the DeviceCfg register it's more typical to only need to
set or clear a single bit. A generic ep93xx_devcfg_set_clear()
function is provided to handle both operations. Two inline
functions, ep93xx_devcfg_set_bits() and ep93xx_devcfg_clear_bits()
are also provided to improve code readability.
In addition, the remaining bits in the System Controller Device
Config Register have been documented and the previously defined
names shortened.
All code paths that use this functionality have been updated
except for arch/arm/kernel/crunch.c. That code is in a context
switch path, which is not reentrant, so it is safe against itself.
Cc: Lennert Buytenhek <buytenh@wantstofly.org>
Cc: Matthias Kaehlcke <matthias@kaehlcke.net>
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Ryan Mallon <ryan@bluewatersys.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-ep93xx/include/mach/platform.h')
-rw-r--r-- | arch/arm/mach-ep93xx/include/mach/platform.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm/mach-ep93xx/include/mach/platform.h b/arch/arm/mach-ep93xx/include/mach/platform.h index 05f0f4f2f3c..fb5e59a3ea0 100644 --- a/arch/arm/mach-ep93xx/include/mach/platform.h +++ b/arch/arm/mach-ep93xx/include/mach/platform.h @@ -15,8 +15,24 @@ struct ep93xx_eth_data void ep93xx_map_io(void); void ep93xx_init_irq(void); void ep93xx_init_time(unsigned long); + +/* EP93xx System Controller software locked register write */ +void ep93xx_syscon_swlocked_write(unsigned int val, unsigned int reg); +void ep93xx_devcfg_set_clear(unsigned int set_bits, unsigned int clear_bits); + +static inline void ep93xx_devcfg_set_bits(unsigned int bits) +{ + ep93xx_devcfg_set_clear(bits, 0x00); +} + +static inline void ep93xx_devcfg_clear_bits(unsigned int bits) +{ + ep93xx_devcfg_set_clear(0x00, bits); +} + void ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr); void ep93xx_register_i2c(struct i2c_board_info *devices, int num); + void ep93xx_init_devices(void); extern struct sys_timer ep93xx_timer; |