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ARM: AM43xx: Add support for disabling clocks in uboot

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Add do_disable_clocks() to disable clock domains and module clocks.
These clocks are enabled using do_enable_clocks().

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
This commit is contained in:
Kishon Vijay Abraham I 2015-08-17 13:29:50 +05:30 committed by Jagan Teki
parent 7dd0174467
commit fca45722fb
2 changed files with 53 additions and 0 deletions
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52
arch/arm/cpu/armv7/am33xx/clock.c
View File

@ -144,6 +144,33 @@ 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 +178,14 @@ 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 +205,23 @@ 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;
/* Clock modules that need to be put in SW_DISABLE */
for (i = 0; (i < max) && clk_modules_disable[i]; i++)
disable_clock_module(clk_modules_disable[i],
wait_for_disable);
/* Put the clock domains in SW_SLEEP mode */
for (i = 0; (i < max) && clk_domains[i]; i++)
disable_clock_domain(clk_domains[i]);
}
/*
* Before scaling up the clocks we need to have the PMIC scale up the
* voltages first. This will be dependent on which PMIC is in use

1
arch/arm/include/asm/arch-am33xx/clock.h
View File

@ -112,5 +112,6 @@ void do_setup_dpll(const struct dpll_regs *, const struct dpll_params *);
void prcm_init(void);
void enable_basic_clocks(void);
void do_enable_clocks(u32 *const *, u32 *const *, u8);
void do_disable_clocks(u32 *const *, u32 *const *, u8);
#endif