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authorFabio Estevam <fabio.estevam@freescale.com>2013-12-26 14:51:35 -0200
committerStefano Babic <sbabic@denx.de>2014-01-02 17:16:51 +0100
commit02229827804980e3cce48bf4fce43699046bcf7e (patch)
tree27e881534541e05ab3a63aacdff3cf79ba0d1467 /arch/arm/cpu
parent39f0ac9347ed825089181c4b57ea9326332e66c3 (diff)
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mx6: soc: Disable VDDPU regulator
As U-boot does not use GPU/VPU peripherals, shutdown the VDDPU regulator in order to save power. Signed-off-by: Anson Huang <b20788@freescale.com> Signed-off-by: Jason Liu <r64343@freescale.com> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Diffstat (limited to 'arch/arm/cpu')
-rw-r--r--arch/arm/cpu/armv7/mx6/soc.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c
index 0208cba..009a644 100644
--- a/arch/arm/cpu/armv7/mx6/soc.c
+++ b/arch/arm/cpu/armv7/mx6/soc.c
@@ -19,6 +19,8 @@
#include <asm/arch/mxc_hdmi.h>
#include <asm/arch/crm_regs.h>
+#define VDDPU_MASK (0x1f << 9)
+
enum ldo_reg {
LDO_ARM,
LDO_SOC,
@@ -177,11 +179,50 @@ static void imx_set_wdog_powerdown(bool enable)
writew(enable, &wdog2->wmcr);
}
+static void imx_set_vddpu_power_down(void)
+{
+ struct anatop_regs *anatop = (struct anatop_regs *)ANATOP_BASE_ADDR;
+ struct gpc_regs *gpc = (struct gpc_regs *)GPC_BASE_ADDR;
+
+ u32 reg;
+
+ /*
+ * Disable the brown out detection since we are going to be
+ * disabling the LDO.
+ */
+ reg = readl(&anatop->ana_misc2);
+ reg &= ~ANADIG_ANA_MISC2_REG1_BO_EN;
+ writel(reg, &anatop->ana_misc2);
+
+ /* need to power down xPU in GPC before turning off PU LDO */
+ reg = readl(&gpc->gpu_ctrl);
+ writel(reg | 0x1, &gpc->gpu_ctrl);
+
+ reg = readl(&gpc->ctrl);
+ writel(reg | 0x1, &gpc->ctrl);
+ while (readl(&gpc->ctrl) & 0x1)
+ ;
+
+ /* Mask the ANATOP brown out interrupt in the GPC. */
+ reg = readl(&gpc->imr4);
+ reg |= 0x80000000;
+ writel(reg, &gpc->imr4);
+
+ /* disable VDDPU */
+ writel(VDDPU_MASK, &anatop->reg_core_clr);
+
+ /* Clear the BO interrupt in the ANATOP. */
+ reg = readl(&anatop->ana_misc1);
+ reg |= 0x80000000;
+ writel(reg, &anatop->ana_misc1);
+}
+
int arch_cpu_init(void)
{
init_aips();
imx_set_wdog_powerdown(false); /* Disable PDE bit of WMCR register */
+ imx_set_vddpu_power_down();
#ifdef CONFIG_APBH_DMA
/* Start APBH DMA */