[U-Boot] [PATCH 12/18] arm: mx6: add support for Compulab cm-fx6 CoM

[Nikita Kiryanov <nikita@compulab.co.il>]

On 04/08/14 16:36, Nikita Kiryanov wrote:
>
>
> On 04/08/14 07:45, Tim Harvey wrote:
>> On Sun, Aug 3, 2014 at 12:34 AM, Nikita Kiryanov
>> <nikita@compulab.co.il> wrote:
>>> Add initial support for Compulab CM-FX6 CoM.
>>> Support includes MMC, SPI flash, and SPL with dynamic DRAM detection.
>>>
>> <snip>
>>> +
>>> +static void spl_mx6s_dram_init(enum ddr_config dram_config, int reset)
>>> +{
>>> +       struct mx6_mmdc_calibration calib;
>>> +       struct mx6_ddr_sysinfo sysinfo;
>>> +       struct mx6_ddr3_cfg ddr3_cfg;
>>> +
>>> +       if (reset)
>>> +               ((struct mmdc_p_regs *)MX6_MMDC_P0_MDCTL)->mdmisc = 2;
>>> +
>>> +       calib.p0_mpwldectrl0    = 0x005B0061;
>>> +       calib.p0_mpwldectrl1    = 0x004F0055;
>>> +       calib.p0_mpdgctrl0      = 0x0314030C;
>>> +       calib.p0_mpdgctrl1      = 0x025C0268;
>>> +       calib.p0_mprddlctl      = 0x42464646;
>>> +       calib.p0_mpwrdlctl      = 0x36322C34;
>>> +       ddr3_cfg.mem_speed      = 800;
>>> +       ddr3_cfg.density        = 4;
>>> +       ddr3_cfg.rowaddr        = 14;
>>> +       ddr3_cfg.coladdr        = 10;
>>> +       ddr3_cfg.pagesz         = 2;
>>> +       ddr3_cfg.trcd           = 1800;
>>> +       ddr3_cfg.trcmin         = 5200;
>>> +       ddr3_cfg.trasmin        = 3600;
>>> +       ddr3_cfg.SRT            = 0;
>>> +       sysinfo.cs1_mirror      = 1;
>>> +       sysinfo.cs_density      = 16;
>>> +       sysinfo.bi_on           = 1;
>>> +       sysinfo.rtt_nom         = 1;
>>> +       sysinfo.rtt_wr          = 0;
>>> +       sysinfo.ralat           = 5;
>>> +       sysinfo.walat           = 1;
>>> +       sysinfo.mif3_mode       = 3;
>>> +       sysinfo.rst_to_cke      = 0x23;
>>> +       sysinfo.sde_to_rst      = 0x10;
>>> +       switch (dram_config) {
>>> +       case DDR_16BIT_256MB:
>>> +               sysinfo.dsize = 0;
>>> +               sysinfo.ncs = 1;
>>> +               break;
>>> +       case DDR_32BIT_512MB:
>>> +               sysinfo.dsize = 1;
>>> +               sysinfo.ncs = 1;
>>> +               break;
>>> +       case DDR_32BIT_1GB:
>>> +               sysinfo.dsize = 1;
>>> +               sysinfo.ncs = 2;
>>> +               break;
>>> +       default:
>>> +               puts("Tried to setup invalid DDR configuration\n");
>>> +               hang();
>>> +       }
>>> +
>>> +       mx6_dram_cfg(&sysinfo, &calib, &ddr3_cfg);
>>> +       udelay(100);
>>> +}
>>
>> Nikita,
>>
>> I'm curious why you add an extra udelay(100) here? There is an
>> mdelay(1) before the return of mx6_dram_cfg() to wait for auto-ZQ
>> calibration to complete (I never found a way to determine when it was
>> complete via registers).
>
> Yes you're right. This udelay can probably be removed (unless I catch
> the board misbehaving during multiple resets).

Caught the DRAM config failing during multiple resets when udelay(100)
is removed, so I guess they stay..

>
>>
>> Regards,
>>
>> Tim
>>
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