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

[Marek Vasut <marex@denx.de>]

On 05/06/2016 01:34 PM, Daniel Schwierzeck wrote:
> 
> 
> 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@denx.de>
>> Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
>> Cc: Wills Wang <wills.wang@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

Hm ok, off-by-one character error. Fixed.

>> 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

OK, dropped.

>> +
>> +	/*
>> +	 * 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;
>> +}
>>
> 


-- 
Best regards,
Marek Vasut