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authorAnson Huang <b20788@freescale.com>2014-01-23 14:00:19 +0800
committerStefano Babic <sbabic@denx.de>2014-02-11 11:24:01 +0100
commit16197bb8ba5962ab3a9c065c06c91c8c288c0f8e (patch)
tree4b5e3531492ecb608351a1e109373bfa10fd6151
parent5c92edc21c3e12873cd3de5ed73d85d48b8828ac (diff)
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imx6: make sure MMDC_CHx_MASK is clear to avoid warm reset failure
Boot ROM may mask MMDC_CHx_MASK in CCM_CCDR(such as i.MX6SL TO1.2), it will cause warm reset fail, need to clear this MMDC_CHx_MASK field to make sure all the i.MX6 series SOCs reset function work. Otherwise, uboot "reset" command will fail, tested on i.MX6SL EVK board with TO1.2. Signed-off-by: Anson Huang <b20788@freescale.com>
-rw-r--r--arch/arm/cpu/armv7/mx6/soc.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c
index 33a2939..2aad0a1 100644
--- a/arch/arm/cpu/armv7/mx6/soc.c
+++ b/arch/arm/cpu/armv7/mx6/soc.c
@@ -189,10 +189,21 @@ static void set_ahb_rate(u32 val)
(div << MXC_CCM_CBCDR_AHB_PODF_OFFSET), &mxc_ccm->cbcdr);
}
+static void clear_mmdc_ch_mask(void)
+{
+ struct mxc_ccm_reg *mxc_ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
+
+ /* Clear MMDC channel mask */
+ writel(0, &mxc_ccm->ccdr);
+}
+
int arch_cpu_init(void)
{
init_aips();
+ /* Need to clear MMDC_CHx_MASK to make warm reset work. */
+ clear_mmdc_ch_mask();
+
/*
* When low freq boot is enabled, ROM will not set AHB
* freq, so we need to ensure AHB freq is 132MHz in such