[U-Boot] [PATCH] Atmel : usb : add EHCI driver for Atmel SoC

[Bo Shen]

Hi Marek,

On 6/21/2012 18:17, Marek Vasut wrote:
> Dear Bo Shen,
>
>> Some Atmel SoC support USB EHCI, add the EHCI driver to support it.
>>
>> To enable the USB EHCI, add the following configuration options into
>> board relative configuration file and remove USB OHCI options.
>>
>>    #define CONFIG_USB_EHCI
>>    #define CONFIG_USB_EHCI_ATMEL
>>    #define CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS     2
>>
>> Signed-off-by: Bo Shen<voice.shen at atmel.com>
>> ---
>>   drivers/usb/host/Makefile     |    1 +
>>   drivers/usb/host/ehci-atmel.c |   67
>> +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 68
>> insertions(+)
>>   create mode 100644 drivers/usb/host/ehci-atmel.c
>>
>> diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
>> index 59c3e57..4547f37 100644
>> --- a/drivers/usb/host/Makefile
>> +++ b/drivers/usb/host/Makefile
>> @@ -36,6 +36,7 @@ COBJS-$(CONFIG_USB_SL811HS) += sl811-hcd.o
>>   # echi
>>   COBJS-$(CONFIG_USB_EHCI) += ehci-hcd.o
>>   COBJS-$(CONFIG_USB_EHCI_ARMADA100) += ehci-armada100.o utmi-armada100.o
>> +COBJS-$(CONFIG_USB_EHCI_ATMEL) += ehci-atmel.o
>>   ifdef CONFIG_MPC512X
>>   COBJS-$(CONFIG_USB_EHCI_FSL) += ehci-mpc512x.o
>>   else
>> diff --git a/drivers/usb/host/ehci-atmel.c b/drivers/usb/host/ehci-atmel.c
>> new file mode 100644
>> index 0000000..a3418c4
>> --- /dev/null
>> +++ b/drivers/usb/host/ehci-atmel.c
>> @@ -0,0 +1,67 @@
>> +/*
>> + * (C) Copyright 2012
>> + * Atmel Semiconductor<www.atmel.com>
>> + * Written-by: Bo Shen<voice.shen at atmel.com>
>> + *
>> + * See file CREDITS for list of people who contributed to this
>> + * project.
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation; either version 2 of
>> + * the License, or (at your option) any later version.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU General Public License
>> + * along with this program; if not, write to the Free Software
>> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
>> + * MA 02110-1301 USA
>> + */
>> +
>> +#include<common.h>
>> +#include<usb.h>
>> +#include<asm/io.h>
>> +#include<asm/arch/hardware.h>
>> +#include<asm/arch/at91_pmc.h>
>> +#include<asm/arch/clk.h>
>> +
>> +#include "ehci.h"
>> +#include "ehci-core.h"
>> +
>> +int ehci_hcd_init(void)
>> +{
>> +	at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
>> +
>> +	/* Enable UPLL  */
>> +	writel(AT91_PMC_UPLLEN | AT91_PMC_BIASEN,&pmc->uckr);
>> +	while ((readl(&pmc->sr)&  AT91_PMC_LOCKU) != AT91_PMC_LOCKU)
>> +		;
>
> Add WATCHDOG_RESET() and fix it not to be an endless loop.

OK, I will fix it at next version patch.

>
>> +
>> +	/* Enable USB Host clock */
>> +	writel(1<<  ATMEL_ID_UHPHS,&pmc->pcer);
>> +
>> +	hccr = (struct ehci_hccr *)ATMEL_BASE_EHCI;
>> +	hcor = (struct ehci_hcor *)((uint32_t)hccr +
>> +			HC_LENGTH(ehci_readl(&hccr->cr_capbase)));
>> +
>> +	return 0;
>> +}
>> +
>> +int ehci_hcd_stop(void)
>> +{
>> +	at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
>> +
>> +	/* Disable USB Host Clock */
>> +	writel(1<<  ATMEL_ID_UHPHS,&pmc->pcdr);
>> +
>> +	/* Disable UPLL */
>> +	writel(readl(&pmc->uckr)&  (~AT91_PMC_UPLLEN),&pmc->uckr);
>> +	while ((readl(&pmc->sr)&  AT91_PMC_LOCKU) == AT91_PMC_LOCKU)
>> +		;
>
> DTTO

OK, I will fix it at next version patch.

>
>> +
>> +	return 0;
>> +}
>
> btw do you have some user for this code?

The at91sam9m10g45ek now uses OHCI, if needed, it can use EHCI. New 
coming boards will use EHCI.

>
> Best regards,
> Marek Vasut