[U-Boot] [PATCH 1/4] USB: ohci-at91: support sama5d3x devices

Andreas Bießmann
2013-03-07T09:12:33Z

Dear Bo Shen,

On 28.02.13 08:00, Bo Shen wrote:
> Add OHCI support for sama5d3x devices
>
> Signed-off-by: Bo Shen <voice.shen@atmel.com>
> ---
> drivers/usb/host/ohci-at91.c | 14 ++++++++++++--
> 1 file changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
> index efd711d..35a282e 100644
> --- a/drivers/usb/host/ohci-at91.c
> +++ b/drivers/usb/host/ohci-at91.c
> @@ -42,7 +42,7 @@ int usb_cpu_init(void)
> while ((readl(&pmc->sr) & AT91_PMC_LOCKB) != AT91_PMC_LOCKB)
> ;
> #elif defined(CONFIG_AT91SAM9G45) || defined(CONFIG_AT91SAM9M10G45) || \
> - defined(CONFIG_AT91SAM9X5)
> + defined(CONFIG_AT91SAM9X5) || defined(CONFIG_SAMA5D3)

I think these ifdeffery increases alarmingly here and there. Can we find
a better solution like

#if defined(ATMEL_OHCI_NEEDS_UPLL)

or whatever we can call it. I mean to classify this and enable it in the
respective SoC headers. Maybe here we can distinguish upon the IP version?

> /* Enable UPLL */
> writel(readl(&pmc->uckr) | AT91_PMC_UPLLEN | AT91_PMC_BIASEN,
> &pmc->uckr);
> @@ -54,7 +54,12 @@ int usb_cpu_init(void)
> #endif
>
> /* Enable USB host clock. */
> +#if defined(CONFIG_SAMA5D3)

I think this ifdef is Ok instead.

> + writel(1 << (ATMEL_ID_UHP - 32), &pmc->pcer1);
> +#else
> writel(1 << ATMEL_ID_UHP, &pmc->pcer);
> +#endif
> +
> #ifdef CONFIG_AT91SAM9261
> writel(ATMEL_PMC_UHP | AT91_PMC_HCK0, &pmc->scer);
> #else
> @@ -69,7 +74,12 @@ int usb_cpu_stop(void)
> at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
>
> /* Disable USB host clock. */
> +#if defined(CONFIG_SAMA5D3)
> + writel(1 << (ATMEL_ID_UHP - 32), &pmc->pcdr1);
> +#else
> writel(1 << ATMEL_ID_UHP, &pmc->pcdr);
> +#endif
> +
> #ifdef CONFIG_AT91SAM9261
> writel(ATMEL_PMC_UHP | AT91_PMC_HCK0, &pmc->scdr);
> #else
> @@ -83,7 +93,7 @@ int usb_cpu_stop(void)
> while ((readl(&pmc->sr) & AT91_PMC_LOCKB) != 0)
> ;
> #elif defined(CONFIG_AT91SAM9G45) || defined(CONFIG_AT91SAM9M10G45) || \
> - defined(CONFIG_AT91SAM9X5)
> + defined(CONFIG_AT91SAM9X5) || defined(CONFIG_SAMA5D3)
> /* Disable UPLL */
> writel(readl(&pmc->uckr) & (~AT91_PMC_UPLLEN), &pmc->uckr);
> while ((readl(&pmc->sr) & AT91_PMC_LOCKU) == AT91_PMC_LOCKU)
>

I think the ifdef comment above is no show stopper for this patch but
should be considered at least for a future patch.
The rest looks sane to me.

Best regards

Andreas Bie?mann