[U-Boot] [PATCH v4 3/4] usb: dwc3: add support for 16 bit UTMI+ interface

[Marek Vasut]

On 09/01/2016 04:14 AM, Kever Yang wrote:
> The dwc3 controller is using 8 bit UTMI+ interface for USB2.0 PHY,
> add one variable in dwc3/dwc3_device struct to support 16 bit
> UTMI+ interface on some SoCs like Rockchip rk3399.
> 
> Signed-off-by: Kever Yang <kever.yang at rock-chips.com>
> ---
> 
> Changes in v4:
> - use 1 bit for usb2_phyif_utmi_width instead of 5bit
> 
> Changes in v3:
> - Parse the DT for utmi+ interface width in dwc3 driver
> 
> Changes in v2:
> - use a variable to identify utmi+ bus width instead of CONFIG MACRO
> 
>  drivers/usb/dwc3/core.c | 19 +++++++++++++++++++
>  drivers/usb/dwc3/core.h | 12 ++++++++++++
>  2 files changed, 31 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 85cc96a..8792f99 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -16,6 +16,7 @@
>  
>  #include <common.h>
>  #include <malloc.h>
> +#include <fdtdec.h>
>  #include <dwc3-uboot.h>
>  #include <asm/dma-mapping.h>
>  #include <linux/ioport.h>
> @@ -29,6 +30,8 @@
>  
>  #include "linux-compat.h"
>  
> +DECLARE_GLOBAL_DATA_PTR;
> +
>  static LIST_HEAD(dwc3_list);
>  /* -------------------------------------------------------------------------- */
>  
> @@ -388,6 +391,11 @@ static void dwc3_phy_setup(struct dwc3 *dwc)
>  	if (dwc->dis_u2_susphy_quirk)
>  		reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
>  
> +	if (dwc->usb2_phyif_utmi_width == 1) {
> +		reg &= ~DWC3_GUSB2PHYCFG_USBTRDTIM_MASK;
> +		reg |= DWC3_GUSB2PHYCFG_USBTRDTIM_16BIT;
> +		reg |= DWC3_GUSB2PHYCFG_PHYIF_16BIT;
> +	}
>  	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
>  
>  	mdelay(100);
> @@ -621,6 +629,8 @@ int dwc3_uboot_init(struct dwc3_device *dwc3_dev)
>  	int			ret;
>  
>  	void			*mem;
> +	const void *blob = gd->fdt_blob;
> +	int node;
>  
>  	mem = devm_kzalloc(dev, sizeof(*dwc) + DWC3_ALIGN_MASK, GFP_KERNEL);
>  	if (!mem)
> @@ -682,6 +692,15 @@ int dwc3_uboot_init(struct dwc3_device *dwc3_dev)
>  
>  	dwc->index = dwc3_dev->index;
>  
> +	node = fdt_node_offset_by_compatible(blob, -1,
> +			"rockchip,rk3399-xhci");
> +	if (node < 0)
> +		debug("%s dwc3 node not found\n", __func__);
> +	else
> +		dwc->usb2_phyif_utmi_width =
> +			(fdtdec_get_int(blob, node, "snps,phyif-utmi-bits", -1)
> +			 == 16) ? 1 : 0;

What happens if fdtdec_get_int() returns -1 here ? Is that an error?

I just took a look into Linux and they use "phy_type" property to
describe the PHY bus, with possible values being "utmi" "utmi_wide"
"ulpi" etc . Do we need to invent new vendor-specific property ?
See Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt in Linux
for example.

>  	dwc3_cache_hwparams(dwc);
>  
>  	ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE);
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 72d2fcd..7484d5f 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -74,6 +74,7 @@
>  #define DWC3_GCTL		0xc110
>  #define DWC3_GEVTEN		0xc114
>  #define DWC3_GSTS		0xc118
> +#define DWC3_GUCTL1		0xc11c
>  #define DWC3_GSNPSID		0xc120
>  #define DWC3_GGPIO		0xc124
>  #define DWC3_GUID		0xc128
> @@ -162,7 +163,17 @@
>  
>  /* Global USB2 PHY Configuration Register */
>  #define DWC3_GUSB2PHYCFG_PHYSOFTRST	(1 << 31)
> +#define DWC3_GUSB2PHYCFG_ENBLSLPM   (1 << 8)
>  #define DWC3_GUSB2PHYCFG_SUSPHY		(1 << 6)
> +#define DWC3_GUSB2PHYCFG_PHYIF_8BIT	(0 << 3)
> +#define DWC3_GUSB2PHYCFG_PHYIF_16BIT	(1 << 3)
> +#define DWC3_GUSB2PHYCFG_USBTRDTIM_SHIFT	(10)
> +#define DWC3_GUSB2PHYCFG_USBTRDTIM_MASK	(0xf << \
> +		DWC3_GUSB2PHYCFG_USBTRDTIM_SHIFT)
> +#define DWC3_GUSB2PHYCFG_USBTRDTIM_16BIT (0x5 << \
> +		DWC3_GUSB2PHYCFG_USBTRDTIM_SHIFT)
> +#define DWC3_GUSB2PHYCFG_USBTRDTIM_8BIT (0x9 << \
> +		DWC3_GUSB2PHYCFG_USBTRDTIM_SHIFT)
>  
>  /* Global USB3 PIPE Control Register */
>  #define DWC3_GUSB3PIPECTL_PHYSOFTRST	(1 << 31)
> @@ -813,6 +824,7 @@ struct dwc3 {
>  
>  	unsigned		tx_de_emphasis_quirk:1;
>  	unsigned		tx_de_emphasis:2;
> +	unsigned		usb2_phyif_utmi_width:1;
>  	int			index;
>  	struct list_head        list;
>  };
> 


-- 
Best regards,
Marek Vasut