From 5c92edc21c3e12873cd3de5ed73d85d48b8828ac Mon Sep 17 00:00:00 2001 From: Anson Huang Date: Thu, 23 Jan 2014 14:00:18 +0800 Subject: [PATCH] imx6: ensure AHB clock is 132MHz in low freq boot mode For low freq boot mode(ARM boot up with 396MHz), ROM will not set AHB clock to 132MHz, and the reset value of AHB divider is incorrect which will lead to wrong AHB rate, need to correct it. To enable low freq boot mode, need to set BOOT_CFG2[2] to high, tested on i.MX6Q/DL SabreSD board and i.MX6SL EVK board. Reviewed-by: Fabio Estevam Signed-off-by: Anson Huang --- arch/arm/cpu/armv7/mx6/soc.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c index 0208cba..33a2939 100644 --- a/arch/arm/cpu/armv7/mx6/soc.c +++ b/arch/arm/cpu/armv7/mx6/soc.c @@ -177,10 +177,30 @@ static void imx_set_wdog_powerdown(bool enable) writew(enable, &wdog2->wmcr); } +static void set_ahb_rate(u32 val) +{ + struct mxc_ccm_reg *mxc_ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR; + u32 reg, div; + + div = get_periph_clk() / val - 1; + reg = readl(&mxc_ccm->cbcdr); + + writel((reg & (~MXC_CCM_CBCDR_AHB_PODF_MASK)) | + (div << MXC_CCM_CBCDR_AHB_PODF_OFFSET), &mxc_ccm->cbcdr); +} + int arch_cpu_init(void) { init_aips(); + /* + * When low freq boot is enabled, ROM will not set AHB + * freq, so we need to ensure AHB freq is 132MHz in such + * scenario. + */ + if (mxc_get_clock(MXC_ARM_CLK) == 396000000) + set_ahb_rate(132000000); + imx_set_wdog_powerdown(false); /* Disable PDE bit of WMCR register */ #ifdef CONFIG_APBH_DMA -- 2.7.4