On Tue, Aug 23, 2011 at 02:30:27PM +0200, Teresa Gámez wrote:
> Some older pcm043 only work correct when cpu frequency is set up
> to 399MHz. All modules with revision >= 1315.4 are equipped
> with a i.MX35 TO2.1 and do run with 532MHz.
Applied to master.
Sascha
>
> Check the silicon revision and set up the frequency accordingly.
>
> Signed-off-by: Teresa Gámez <t.gamez@xxxxxxxxx>
> ---
> arch/arm/boards/pcm043/lowlevel.c | 13 ++++++++++++-
> 1 files changed, 12 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/boards/pcm043/lowlevel.c b/arch/arm/boards/pcm043/lowlevel.c
> index bbe586b..e488681 100644
> --- a/arch/arm/boards/pcm043/lowlevel.c
> +++ b/arch/arm/boards/pcm043/lowlevel.c
> @@ -37,6 +37,11 @@
> #define MPCTL_PARAM_532 ((1 << 31) | IMX_PLL_PD(0) | IMX_PLL_MFD(11) | IMX_PLL_MFI(11) | IMX_PLL_MFN(1))
> #define PPCTL_PARAM_300 (IMX_PLL_PD(0) | IMX_PLL_MFD(3) | IMX_PLL_MFI(6) | IMX_PLL_MFN(1))
>
> +#define IMX35_CHIP_REVISION_2_1 0x11
> +
> +#define CCM_PDR0_399 0x00011000
> +#define CCM_PDR0_532 0x00001000
> +
> #ifdef CONFIG_NAND_IMX_BOOT
> static void __bare_init __naked insdram(void)
> {
> @@ -111,7 +116,13 @@ void __bare_init __naked board_init_lowlevel(void)
> writel(MPCTL_PARAM_532, ccm_base + CCM_MPCTL);
>
> writel(PPCTL_PARAM_300, ccm_base + CCM_PPCTL);
> - writel(0x00001000, ccm_base + CCM_PDR0);
> +
> + /* Check silicon revision and use 532MHz if >=2.1 */
> + r = readl(IMX_IIM_BASE + 0x24);
> + if (r >= IMX35_CHIP_REVISION_2_1)
> + writel(CCM_PDR0_532, ccm_base + CCM_PDR0);
> + else
> + writel(CCM_PDR0_399, ccm_base + CCM_PDR0);
>
> r = readl(ccm_base + CCM_CGR0);
> r |= 0x00300000;
> --
> 1.7.0.4
>
>
--
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