On 27/12/2016 02:04, Fabio Estevam wrote:
> From: Fabio Estevam <fabio.este...@nxp.com>
>
> On the MX6Q the aclk_eim_slow_podf field is '1' after POR, while on the
> MX6DQP it is '3'.
>
> This makes the EIM clock to be only 66MHz on the mx6qp variant, instead of
> 132 MHz.
>
> Instead of relying on the POR values for the CSMR1 register, make sure to
> manually configure the clk_eim_slow_sel field as '00' so that EIM clock is
> derived from AXI clock and the aclk_eim_slow_podf field as '1' so that EIM
> clock can be AXI clock divided by 2.
>
> This way a consistent EIM clock frequency is configured for all the mx6
> variants.
>
> Signed-off-by: Fabio Estevam <fabio.este...@nxp.com>
> ---
> board/freescale/mx6qsabreauto/mx6qsabreauto.c | 28
> +++++++++++++++++++++++++++
> 1 file changed, 28 insertions(+)
>
> diff --git a/board/freescale/mx6qsabreauto/mx6qsabreauto.c
> b/board/freescale/mx6qsabreauto/mx6qsabreauto.c
> index 5fca4d1..51bbbc4 100644
> --- a/board/freescale/mx6qsabreauto/mx6qsabreauto.c
> +++ b/board/freescale/mx6qsabreauto/mx6qsabreauto.c
> @@ -231,6 +231,33 @@ static void eimnor_cs_setup(void)
> set_chipselect_size(CS0_128);
> }
>
> +static void eim_clk_setup(void)
> +{
> + struct mxc_ccm_reg *imx_ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
> + int cscmr1, ccgr6;
> +
> +
> + /* Turn off EIM clock */
> + ccgr6 = readl(&imx_ccm->CCGR6);
> + ccgr6 &= ~(0x3 << 10);
> + writel(ccgr6, &imx_ccm->CCGR6);
> +
> + /*
> + * Configure clk_eim_slow_sel = 00 --> derive clock from AXI clk root
> + * and aclk_eim_slow_podf = 01 --> divide by 2
> + * so that we can have EIM at the maximum clock of 132MHz
> + */
> + cscmr1 = readl(&imx_ccm->cscmr1);
> + cscmr1 &= ~(MXC_CCM_CSCMR1_ACLK_EMI_SLOW_MASK |
> + MXC_CCM_CSCMR1_ACLK_EMI_SLOW_PODF_MASK);
> + cscmr1 |= (1 << MXC_CCM_CSCMR1_ACLK_EMI_SLOW_PODF_OFFSET);
> + writel(cscmr1, &imx_ccm->cscmr1);
> +
> + /* Turn on EIM clock */
> + ccgr6 |= (0x3 << 10);
> + writel(ccgr6, &imx_ccm->CCGR6);
> +}
> +
> static void setup_iomux_eimnor(void)
> {
> imx_iomux_v3_setup_multiple_pads(eimnor_pads, ARRAY_SIZE(eimnor_pads));
> @@ -519,6 +546,7 @@ int board_early_init_f(void)
> #ifdef CONFIG_NAND_MXS
> setup_gpmi_nand();
> #endif
> + eim_clk_setup();
>
> return 0;
> }
>
Applied to u-boot-imx, -master, thanks !
Best regards,
Stefano Babic
--
=====================================================================
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sba...@denx.de
=====================================================================
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
