diff options
Diffstat (limited to 'arch/arm/cpu/armv7/mx6')
| -rw-r--r-- | arch/arm/cpu/armv7/mx6/soc.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c index e599a12b3a..ef029722b4 100644 --- a/arch/arm/cpu/armv7/mx6/soc.c +++ b/arch/arm/cpu/armv7/mx6/soc.c @@ -230,6 +230,11 @@ static void imx_set_wdog_powerdown(bool enable) struct wdog_regs *wdog1 = (struct wdog_regs *)WDOG1_BASE_ADDR; struct wdog_regs *wdog2 = (struct wdog_regs *)WDOG2_BASE_ADDR; +#ifdef CONFIG_MX6SX + struct wdog_regs *wdog3 = (struct wdog_regs *)WDOG3_BASE_ADDR; + writew(enable, &wdog3->wmcr); +#endif + /* Write to the PDE (Power Down Enable) bit */ writew(enable, &wdog1->wmcr); writew(enable, &wdog2->wmcr); @@ -255,6 +260,23 @@ static void clear_mmdc_ch_mask(void) writel(0, &mxc_ccm->ccdr); } +static void init_bandgap(void) +{ + struct anatop_regs *anatop = (struct anatop_regs *)ANATOP_BASE_ADDR; + /* + * Ensure the bandgap has stabilized. + */ + while (!(readl(&anatop->ana_misc0) & 0x80)) + ; + /* + * For best noise performance of the analog blocks using the + * outputs of the bandgap, the reftop_selfbiasoff bit should + * be set. + */ + writel(BM_ANADIG_ANA_MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_set); +} + + #ifdef CONFIG_MX6SL static void set_preclk_from_osc(void) { @@ -275,6 +297,13 @@ int arch_cpu_init(void) clear_mmdc_ch_mask(); /* + * Disable self-bias circuit in the analog bandap. + * The self-bias circuit is used by the bandgap during startup. + * This bit should be set after the bandgap has initialized. + */ + init_bandgap(); + + /* * When low freq boot is enabled, ROM will not set AHB * freq, so we need to ensure AHB freq is 132MHz in such * scenario. |