[U-Boot] phy ic isn't reset

[Bo Shen <voice.shen@atmel.com>]

Hi Alex

On 4/18/2013 13:27, alex wrote:
>
> At 2013-04-18 09:23:48,"Bo Shen" <voice.shen@atmel.com> wrote:
>>Hi Alex,
>>
>>On 4/17/2013 18:29, alex wrote:
>>> Hi:
>>>    I work on one board based on at9g25evk board now. I find one issue
>>> that phy IC isn't reset, so network can't work. Only the different
>>> crystal with evk board is connected to PHY IC. I copy the phy-reset part
>>> of at9260 to at9g25. It can work now. Please the maintainer of at9gx5
>>> check this. The modification I do is as below:
>>
>>As you mentioned, you use different crystal, please specify this in detail.
>
> S3225A package, 50Mhz crystal oscillator. ocean comonents ltd. ---> can work.
>
> asem series:ASEM1-50.000MHZ-LC-T  ---->can't work.
>
>>
>>> +
>>> +#ifdef CONFIG_MACB
>>> +int at91sam9x5ek_macb_hw_init(void)
>>> +{
>>> +        struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
>>> +        struct at91_port *pioa = (struct at91_port *)ATMEL_BASE_PIOA;
>>> +       struct at91_rstc *rstc = (struct at91_rstc *)ATMEL_BASE_RSTC;
>>> +       unsigned long erstl;
>>> +
>>> +        /* Enable EMAC clock */
>>> +        writel(1 << ATMEL_ID_EMAC0, &pmc->pcer);
>>> +
>>> +       erstl = readl(&rstc->mr) & AT91_RSTC_MR_ERSTL_MASK;
>>> +
>>> +       /* Need to reset PHY -> 500ms reset */
>>> +       writel(AT91_RSTC_KEY | AT91_RSTC_MR_ERSTL(13) |
>>> +                       AT91_RSTC_MR_URSTEN, &rstc->mr);
>>> +
>>> +       writel(AT91_RSTC_KEY | AT91_RSTC_CR_EXTRST, &rstc->cr);
>>> +
>>> +       /* Wait for end hardware reset */
>>> +       while (!(readl(&rstc->sr) & AT91_RSTC_SR_NRSTL))
>>> +               ;
>>> +
>>> +       /* Restore NRST value */
>>> +       writel(AT91_RSTC_KEY | erstl | AT91_RSTC_MR_URSTEN,
>>> +                       &rstc->mr);
>>> +
>>> +       at91_macb_hw_init();
>>> +}
>>> +#endif
>>
>>On at91sam9g25ek, it don't need this patch. The network work properly.
>>
>>Btw, please help provide the log information for why not ethernet
>>doesn't work.
>
>  From at91sam9g25ek side, no any error. If you only plug network line , the network traffic led is always off, that is,DM9161AEP doesn't check this change.
> Even if I add this patch, no any defect, right?

I won't suggest do like this, if you use reset controller, it will 
assert nRST pin. If one more device use nRST, it will also reset other 
device. if only PHY use nRST and no other consideration, I think it is OK.

Best Regards,
Bo Shen