[U-Boot] [PATCH v2 2/4] usb: dwc3: Add helper functions to enable snooping and burst settings

[Marek Vasut <marex@denx.de>]

On 06/06/2016 11:16 AM, Rajat Srivastava wrote:
> Adds helper functions to enable snooping and outstanding burst beat
> settings.
> 
> Signed-off-by: Rajat Srivastava <rajat.srivastava@nxp.com>
> Signed-off-by: Rajesh Bhagat <rajesh.bhagat@nxp.com>
> ---
> Changes in v2:
>  - Removes SoC specific flags and added helper functions
> 
>  drivers/usb/dwc3/core.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
>  drivers/usb/dwc3/core.h |  7 +++++++
>  2 files changed, 52 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 85cc96a..0b3c596 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -599,6 +599,51 @@ static void dwc3_core_exit_mode(struct dwc3 *dwc)
>  
>  #define DWC3_ALIGN_MASK		(16 - 1)
>  
> +void dwc3_core_incr_burst_enable(int index, int btype_incr_val,
> +				 int breq_limit)
> +{
> +	struct dwc3 *dwc;
> +	u32 reg;
> +
> +	list_for_each_entry(dwc, &dwc3_list, list) {

Why is this iterating over a list of all controllers ?
Should this be enabled on per-controller basis by some DT prop ?

> +		if (dwc->index != index)
> +			continue;
> +
> +		/*
> +		 * Change burst beat and outstanding pipelined
> +		 * transfers requests
> +		 */
> +		reg = dwc3_readl(dwc->regs, DWC3_GSBUSCFG0);
> +		reg = (reg & ~DWC3_INCR_BTYPE_MASK) | btype_incr_val;
> +		dwc3_writel(dwc->regs, DWC3_GSBUSCFG0, reg);
> +
> +		reg = dwc3_readl(dwc->regs, DWC3_GSBUSCFG1);
> +		reg = (reg & ~DWC3_BREQ_LIMIT_MASK) | (breq_limit << 8);
> +		dwc3_writel(dwc->regs, DWC3_GSBUSCFG1, reg);
> +		break;
> +	}
> +}
> +
> +void dwc3_core_set_snooping(int index, bool snoop)
> +{
> +	struct dwc3 *dwc;
> +	u32 reg;
> +
> +	list_for_each_entry(dwc, &dwc3_list, list) {
> +		if (dwc->index != index)
> +			continue;
> +
> +		/* Enable/Disable snooping */
> +		reg = dwc3_readl(dwc->regs, DWC3_GSBUSCFG0);
> +		if (snoop)
> +			reg = reg | DWC3_SNOOP_ENABLE;
> +		else
> +			reg = reg & ~DWC3_SNOOP_ENABLE;
> +		dwc3_writel(dwc->regs, DWC3_GSBUSCFG0, reg);
> +		break;
> +	}
> +}
> +
>  /**
>   * dwc3_uboot_init - dwc3 core uboot initialization code
>   * @dwc3_dev: struct dwc3_device containing initialization data
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 72d2fcd..455e7fa 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -593,6 +593,13 @@ struct dwc3_hwparams {
>  /* HWPARAMS7 */
>  #define DWC3_RAM1_DEPTH(n)	((n) & 0xffff)
>  
> +/* GSBUSCFG0 */
> +#define DWC3_SNOOP_ENABLE	(0x22220000)
> +#define DWC3_INCR_BTYPE_MASK	(0xff)
> +
> +/* GSBUSCFG1 */
> +#define DWC3_BREQ_LIMIT_MASK	(0xf00)
> +
>  struct dwc3_request {
>  	struct usb_request	request;
>  	struct list_head	list;
> 


-- 
Best regards,
Marek Vasut