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authorKishon Vijay Abraham I <kishon@ti.com>2015-08-17 13:29:50 +0530
committerJagan Teki <jteki@openedev.com>2015-08-17 23:29:14 +0530
commitfca45722fbb0ef0b216efa8ad053a3c1cab44972 (patch)
tree1b123936f2df4dabe2eed8681d6b92c97735db46 /arch/arm/cpu/armv7/am33xx
parent7dd0174467a2a1fc99d7dc19b11bbadc80f9c740 (diff)
downloadblackbird-obmc-uboot-fca45722fbb0ef0b216efa8ad053a3c1cab44972.tar.gz
blackbird-obmc-uboot-fca45722fbb0ef0b216efa8ad053a3c1cab44972.zip
ARM: AM43xx: Add support for disabling clocks in uboot
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>
Diffstat (limited to 'arch/arm/cpu/armv7/am33xx')
-rw-r--r--arch/arm/cpu/armv7/am33xx/clock.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/am33xx/clock.c b/arch/arm/cpu/armv7/am33xx/clock.c
index ec7d46838b..595c951ed2 100644
--- a/arch/arm/cpu/armv7/am33xx/clock.c
+++ b/arch/arm/cpu/armv7/am33xx/clock.c
@@ -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
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