[U-Boot] [PATCH 3/6] ARM: AM43xx: Add support for disabling clocks in uboot

[Kishon Vijay Abraham I]

Hi,

On Tuesday 11 August 2015 12:31 PM, Lukasz Majewski wrote:
> Hi Kishon,
> 
>> Add do_disable_clocks() to disable clock domains and module clocks.
>> These clocks are enabled using do_enable_clocks().
> 
> Please correct the message subject. As fair as I can tell you are
> changing clocks on am33xx SoC, not AM43xx.

The same file is used by both am33xx and am43xx. Maybe I can change that to
am33xx/am43xx.
> 
>>
>> Cc: Roger Quadros <rogerq at ti.com>
>> Cc: Tero Kristo <t-kristo at ti.com>
>> Cc: Nishanth Menon <nm at ti.com>
>> Signed-off-by: Kishon Vijay Abraham I <kishon at ti.com>
>> ---
>>  arch/arm/cpu/armv7/am33xx/clock.c        |   53
>> ++++++++++++++++++++++++++++++
>> arch/arm/include/asm/arch-am33xx/clock.h |    1 + 2 files changed, 54
>> insertions(+)
>>
>> diff --git a/arch/arm/cpu/armv7/am33xx/clock.c
>> b/arch/arm/cpu/armv7/am33xx/clock.c index ec7d468..f6a4cee 100644
>> --- a/arch/arm/cpu/armv7/am33xx/clock.c
>> +++ b/arch/arm/cpu/armv7/am33xx/clock.c
>> @@ -144,6 +144,34 @@ static inline void enable_clock_module(u32
>> *const clkctrl_addr, u32 enable_mode,
>> wait_for_clk_enable(clkctrl_addr); }
>>  
>> +static inline void wait_for_clk_disable(u32 *clkctrl_addr)
>> +{
>> +	u32 clkctrl, idlest = MODULE_CLKCTRL_IDLEST_FULLY_FUNCTIONAL;
>> +	u32 bound = LDELAY;
>> +
>> +	while ((idlest != MODULE_CLKCTRL_IDLEST_DISABLED)) {
>> +		clkctrl = readl(clkctrl_addr);
>> +		idlest = (clkctrl & MODULE_CLKCTRL_IDLEST_MASK) >>
>> +			 MODULE_CLKCTRL_IDLEST_SHIFT;
>> +		if (--bound == 0) {
>> +			printf("Clock disable failed for 0x%p idlest
>> 0x%x\n",
>> +			       clkctrl_addr, clkctrl);
>> +			return;
>> +		}
>> +	}
>> +}
>> +
>> +static inline void disable_clock_module(u32 *const clkctrl_addr,
>> +					u32 wait_for_disable)
>> +{
>> +	clrsetbits_le32(clkctrl_addr, MODULE_CLKCTRL_MODULEMODE_MASK,
>> +			MODULE_CLKCTRL_MODULEMODE_SW_DISABLE <<
>> +			MODULE_CLKCTRL_MODULEMODE_SHIFT);
>> +	debug("Disable clock module - %p\n", clkctrl_addr);
>> +	if (wait_for_disable)
>> +		wait_for_clk_disable(clkctrl_addr);
>> +}
>> +
>>  static inline void enable_clock_domain(u32 *const clkctrl_reg, u32
>> enable_mode) {
>>  	clrsetbits_le32(clkctrl_reg, CD_CLKCTRL_CLKTRCTRL_MASK,
>> @@ -151,6 +179,14 @@ static inline void enable_clock_domain(u32
>> *const clkctrl_reg, u32 enable_mode) debug("Enable clock domain -
>> %p\n", clkctrl_reg); }
>>  
>> +static inline void disable_clock_domain(u32 *const clkctrl_reg)
>> +{
>> +	clrsetbits_le32(clkctrl_reg, CD_CLKCTRL_CLKTRCTRL_MASK,
>> +			CD_CLKCTRL_CLKTRCTRL_SW_SLEEP <<
>> +			CD_CLKCTRL_CLKTRCTRL_SHIFT);
>> +	debug("Disable clock domain - %p\n", clkctrl_reg);
>> +}
>> +
>>  void do_enable_clocks(u32 *const *clk_domains,
>>  		      u32 *const *clk_modules_explicit_en, u8
>> wait_for_enable) {
>> @@ -170,6 +206,23 @@ void do_enable_clocks(u32 *const *clk_domains,
>>  	};
>>  }
>>  
>> +void do_disable_clocks(u32 *const *clk_domains,
>> +			    u32 *const *clk_modules_disable,
>> +			    u8 wait_for_disable)
>> +{
>> +	u32 i, max = 100;
>> +
>> +
> 
> Remove one blank line here.

sure.

Thanks
Kishon