ARM: imx: enable RBC to support anatop LPM mode
RBC is to control whether some ANATOP sub modules
can enter lpm mode when SOC is into STOP mode, if
RBC is enabled and PMIC_VSTBY_REQ is set, ANATOP
will have below behaviors:
1. Digital LDOs(CORE, SOC and PU) are bypassed;
2. Analog LDOs(1P1, 2P5, 3P0) are disabled;
As the 2P5 is necessary for DRAM IO pre-drive in
STOP mode, so we need to enable weak 2P5 in STOP
mode when 2P5 LDO is disabled.
For RBC settings, there are some rules as below
due to hardware design:
1. All interrupts must be masked during operating
RBC registers;
2. At least 2 CKIL(32K) cycles is needed after the
RBC setting is changed.
Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
diff --git a/arch/arm/mach-imx/anatop.c b/arch/arm/mach-imx/anatop.c
index b396b92..8b18b3c 100644
--- a/arch/arm/mach-imx/anatop.c
+++ b/arch/arm/mach-imx/anatop.c
@@ -19,17 +19,34 @@
#define REG_SET 0x4
#define REG_CLR 0x8
+#define ANADIG_REG_2P5 0x130
#define ANADIG_REG_CORE 0x140
+#define ANADIG_ANA_MISC0 0x150
#define ANADIG_USB1_CHRG_DETECT 0x1b0
#define ANADIG_USB2_CHRG_DETECT 0x210
#define ANADIG_DIGPROG 0x260
+#define BM_ANADIG_REG_2P5_ENABLE_WEAK_LINREG 0x40000
#define BM_ANADIG_REG_CORE_FET_ODRIVE 0x20000000
+#define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG 0x1000
#define BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B 0x80000
#define BM_ANADIG_USB_CHRG_DETECT_EN_B 0x100000
static struct regmap *anatop;
+static void imx_anatop_enable_weak2p5(bool enable)
+{
+ u32 reg, val;
+
+ regmap_read(anatop, ANADIG_ANA_MISC0, &val);
+
+ /* can only be enabled when stop_mode_config is clear. */
+ reg = ANADIG_REG_2P5;
+ reg += (enable && (val & BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG) == 0) ?
+ REG_SET : REG_CLR;
+ regmap_write(anatop, reg, BM_ANADIG_REG_2P5_ENABLE_WEAK_LINREG);
+}
+
static void imx_anatop_enable_fet_odrive(bool enable)
{
regmap_write(anatop, ANADIG_REG_CORE + (enable ? REG_SET : REG_CLR),
@@ -38,12 +55,14 @@
void imx_anatop_pre_suspend(void)
{
+ imx_anatop_enable_weak2p5(true);
imx_anatop_enable_fet_odrive(true);
}
void imx_anatop_post_resume(void)
{
imx_anatop_enable_fet_odrive(false);
+ imx_anatop_enable_weak2p5(false);
}
void imx_anatop_usb_chrg_detect_disable(void)