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>

diff --git a/arch/arm/cpu/armv7/am33xx/clock.c b/arch/arm/cpu/armv7/am33xx/clock.c
index ec7d46838b74770b1a284cd4a2a72085506a5725..595c951ed245231f812ccd8c31f35f7237f9a1ab 100644 (file)
--- 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

diff --git a/arch/arm/include/asm/arch-am33xx/clock.h b/arch/arm/include/asm/arch-am33xx/clock.h
index 4af6b57e42f5528c7ed2e78796b654a94f179ec1..a6d2419fb843de713880e16b09fe7e57ad43a090 100644 (file)
--- a/arch/arm/include/asm/arch-am33xx/clock.h
+++ b/arch/arm/include/asm/arch-am33xx/clock.h
@@ -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