[U-Boot] [PATCH 4/8] mips: ath79: Add support for ungating USB on ar933x and ar934x

[Daniel Schwierzeck]

Am 05.05.2016 um 20:14 schrieb Marek Vasut:
> Add code to ungate the USB controller on ar933x and ar934x .
> 
> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>
> Cc: Wills Wang <wills.wang at live.com>
> ---
>  arch/mips/mach-ath79/include/mach/ath79.h |  2 +
>  arch/mips/mach-ath79/reset.c              | 61 +++++++++++++++++++++++++++++++
>  2 files changed, 63 insertions(+)
> 

there are checkpatch.pl warnings:

warning: arch/mips/mach-ath79/reset.c,112: line over 80 characters

> diff --git a/arch/mips/mach-ath79/include/mach/ath79.h b/arch/mips/mach-ath79/include/mach/ath79.h
> index 90d80b8..682b6a2 100644
> --- a/arch/mips/mach-ath79/include/mach/ath79.h
> +++ b/arch/mips/mach-ath79/include/mach/ath79.h
> @@ -140,4 +140,6 @@ static inline int soc_is_qca956x(void)
>  	return soc_is_tp9343() || soc_is_qca9561();
>  }
>  
> +int ath79_usb_reset(void);
> +
>  #endif /* __ASM_MACH_ATH79_H */
> diff --git a/arch/mips/mach-ath79/reset.c b/arch/mips/mach-ath79/reset.c
> index ba38609..bf4bc3b 100644
> --- a/arch/mips/mach-ath79/reset.c
> +++ b/arch/mips/mach-ath79/reset.c
> @@ -5,6 +5,7 @@
>   */
>  
>  #include <common.h>
> +#include <asm/errno.h>
>  #include <asm/io.h>
>  #include <asm/addrspace.h>
>  #include <asm/types.h>
> @@ -69,3 +70,63 @@ u32 get_bootstrap(void)
>  
>  	return 0;
>  }
> +
> +static int usb_reset_ar933x(void __iomem *reset_regs)
> +{
> +	/* Ungate the USB block */
> +	setbits_be32(reset_regs + AR933X_RESET_REG_RESET_MODULE,
> +		     AR933X_RESET_USBSUS_OVERRIDE);
> +	mdelay(1);
> +	clrbits_be32(reset_regs + AR933X_RESET_REG_RESET_MODULE,
> +		     AR933X_RESET_USB_HOST);
> +	mdelay(1);
> +	clrbits_be32(reset_regs + AR933X_RESET_REG_RESET_MODULE,
> +		     AR933X_RESET_USB_PHY);
> +	mdelay(1);
> +
> +	return 0;
> +}
> +
> +static int usb_reset_ar934x(void __iomem *reset_regs)
> +{
> +	/* Ungate the USB block */
> +	setbits_be32(reset_regs + AR934X_RESET_REG_RESET_MODULE,
> +		     AR934X_RESET_USBSUS_OVERRIDE);
> +	mdelay(1);
> +	clrbits_be32(reset_regs + AR934X_RESET_REG_RESET_MODULE,
> +		     AR934X_RESET_USB_PHY);
> +	mdelay(1);
> +	clrbits_be32(reset_regs + AR934X_RESET_REG_RESET_MODULE,
> +		     AR934X_RESET_USB_PHY_ANALOG);
> +	mdelay(1);
> +	clrbits_be32(reset_regs + AR934X_RESET_REG_RESET_MODULE,
> +		     AR934X_RESET_USB_HOST);
> +	mdelay(1);
> +
> +	return 0;
> +}
> +
> +int ath79_usb_reset(void)
> +{
> +	void __iomem *usbc_regs = map_physmem(AR71XX_USB_CTRL_BASE,
> +					      AR71XX_USB_CTRL_SIZE, MAP_NOCACHE);
> +	void __iomem *reset_regs = map_physmem(AR71XX_RESET_BASE,
> +					       AR71XX_RESET_SIZE, MAP_NOCACHE);
> +
> +	if (!usbc_regs || !reset_regs)
> +		return -EINVAL;

those checks are not necessary

> +
> +	/*
> +	 * Turn on the Buff and Desc swap bits.
> +	 * NOTE: This write into an undocumented register in mandatory to
> +	 *       get the USB controller operational in BigEndian mode.
> +	 */
> +	writel(0xf0000, usbc_regs + AR71XX_USB_CTRL_REG_CONFIG);
> +
> +	if (soc_is_ar933x())
> +		return usb_reset_ar933x(reset_regs);
> +	if (soc_is_ar934x())
> +		return usb_reset_ar934x(reset_regs);
> +
> +	return -EINVAL;
> +}
> 

-- 
- Daniel

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