[U-Boot] [PATCH 2/3] usb: zynqmp: Add XHCI driver support

[Marek Vasut <marex@denx.de>]

On Tuesday, August 04, 2015 at 09:33:27 AM, Siva Durga Prasad Paladugu wrote:
> Added USB XHCI driver support for zynqmp.
> 
> Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>

[...]

Hi,

You'd have much more success if you actually CCed me with the patches.

> +/* Declare global data pointer */
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +static struct zynqmp_xhci zynqmp_xhci;
> +
> +unsigned long ctr_addr[] = {ZYNQMP_USB0_XHCI_BASEADDR,
> +			    ZYNQMP_USB1_XHCI_BASEADDR};

Will you always init both controllers ?

> +__weak int __board_usb_init(int index, enum usb_init_type init)
> +{
> +	return 0;
> +}
> +
> +void usb_phy_reset(struct dwc3 *dwc3_reg)
> +{
> +	/* Assert USB3 PHY reset */
> +	setbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
> +
> +	/* Assert USB2 PHY reset */
> +	setbits_le32(&dwc3_reg->g_usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
> +
> +	mdelay(200);

Is such a lengthy delay really needed ?

> +	/* Clear USB3 PHY reset */
> +	clrbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
> +
> +	/* Clear USB2 PHY reset */
> +	clrbits_le32(&dwc3_reg->g_usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
> +}

[...]

> +static int zynqmp_xhci_core_exit(struct zynqmp_xhci *zynqmp_xhci)
> +{
> +	/*
> +	 * Currently zynqmp socs do not support PHY shutdown from
> +	 * sw. But this support may be added in future socs.
> +	 */
> +	return 0;

Please wrap this into xhci_hcd_stop(), no need for this ad-hoc function.

> +}
> +
> +int xhci_hcd_init(int index, struct xhci_hccr **hccr, struct xhci_hcor
> **hcor) +{
> +	struct zynqmp_xhci *ctx = &zynqmp_xhci;
> +	int ret = 0;
> +
> +	ctx->hcd = (struct xhci_hccr *)ctr_addr[index];
> +	ctx->dwc3_reg = (struct dwc3 *)((char *)(ctx->hcd) + DWC3_REG_OFFSET);
> +
> +	ret = board_usb_init(index, USB_INIT_HOST);
> +	if (ret != 0) {
> +		puts("Failed to initialize board for USB\n");
> +		return ret;
> +	}
> +
> +	ret = zynqmp_xhci_core_init(ctx);
> +	if (ret < 0) {
> +		puts("Failed to initialize xhci\n");
> +		return ret;
> +	}
> +
> +	*hccr = (struct xhci_hccr *)ctx->hcd;
> +	*hcor = (struct xhci_hcor *)((uint32_t) *hccr
> +				+ HC_LENGTH(xhci_readl(&(*hccr)->cr_capbase)));
> +
> +	debug("zynqmp-xhci: init hccr %x and hcor %x hc_length %d\n",
> +	      (uint32_t)*hccr, (uint32_t)*hcor,
> +	      (uint32_t)HC_LENGTH(xhci_readl(&(*hccr)->cr_capbase)));
> +
> +	return ret;
> +}
> +
> +void xhci_hcd_stop(int index)
> +{
> +	struct zynqmp_xhci *ctx = &zynqmp_xhci;
> +
> +	zynqmp_xhci_core_exit(ctx);
> +}
> diff --git a/include/linux/usb/xhci-zynqmp.h
> b/include/linux/usb/xhci-zynqmp.h new file mode 100644
> index 0000000..c384f91
> --- /dev/null
> +++ b/include/linux/usb/xhci-zynqmp.h
> @@ -0,0 +1,56 @@

You should just wrap all of this header into the xhci-zynqmp.c and be
done with it, no need for ad-hoc file.

> +/*
> + * Copyright 2015 Xilinx, Inc.
> + *
> + * Zynq USB HOST xHCI Controller
> + *
> + * Author: Siva Durga Prasad Paladugu<sivadur@xilinx.com>
> + *
> + * This file was resused from Freescale USB xHCI
> + *
> + * SPDX-License-Identifier:	GPL-2.0+
> + */
> +
> +#ifndef _ASM_ARCH_XHCI_ZYNQMP_H_
> +#define _ASM_ARCH_XHCI_ZYNQMP_H_
> +
> +/* Default to the FSL XHCI defines */

FSL XHCI ? Really now, I thought this was a xilinx chip.

> +#define USB3_PWRCTL_CLK_CMD_MASK	0x3FE000
> +#define USB3_PWRCTL_CLK_FREQ_MASK	0xFFC
> +#define USB3_PHY_PARTIAL_RX_POWERON     BIT(6)
> +#define USB3_PHY_RX_POWERON		BIT(14)
> +#define USB3_PHY_TX_POWERON		BIT(15)
> +#define USB3_PHY_TX_RX_POWERON	(USB3_PHY_RX_POWERON | 
USB3_PHY_TX_POWERON)
> +#define USB3_PWRCTL_CLK_CMD_SHIFT   14
> +#define USB3_PWRCTL_CLK_FREQ_SHIFT	22
> +
> +/* USBOTGSS_WRAPPER definitions */
> +#define USBOTGSS_WRAPRESET	BIT(17)
> +#define USBOTGSS_DMADISABLE BIT(16)
> +#define USBOTGSS_STANDBYMODE_NO_STANDBY BIT(4)
> +#define USBOTGSS_STANDBYMODE_SMRT		BIT(5)
> +#define USBOTGSS_STANDBYMODE_SMRT_WKUP (0x3 << 4)
> +#define USBOTGSS_IDLEMODE_NOIDLE BIT(2)
> +#define USBOTGSS_IDLEMODE_SMRT BIT(3)
> +#define USBOTGSS_IDLEMODE_SMRT_WKUP (0x3 << 2)
> +
> +/* USBOTGSS_IRQENABLE_SET_0 bit */
> +#define USBOTGSS_COREIRQ_EN	BIT(1)
> +
> +/* USBOTGSS_IRQENABLE_SET_1 bits */
> +#define USBOTGSS_IRQ_SET_1_IDPULLUP_FALL_EN	BIT(1)
> +#define USBOTGSS_IRQ_SET_1_DISCHRGVBUS_FALL_EN	BIT(3)
> +#define USBOTGSS_IRQ_SET_1_CHRGVBUS_FALL_EN	BIT(4)
> +#define USBOTGSS_IRQ_SET_1_DRVVBUS_FALL_EN	BIT(5)
> +#define USBOTGSS_IRQ_SET_1_IDPULLUP_RISE_EN	BIT(8)
> +#define USBOTGSS_IRQ_SET_1_DISCHRGVBUS_RISE_EN	BIT(11)
> +#define USBOTGSS_IRQ_SET_1_CHRGVBUS_RISE_EN	BIT(12)
> +#define USBOTGSS_IRQ_SET_1_DRVVBUS_RISE_EN	BIT(13)
> +#define USBOTGSS_IRQ_SET_1_OEVT_EN		BIT(16)
> +#define USBOTGSS_IRQ_SET_1_DMADISABLECLR_EN	BIT(17)
> +
> +struct zynqmp_xhci {
> +	struct xhci_hccr *hcd;
> +	struct dwc3 *dwc3_reg;

This definitelly should not be in a header file.

> +};
> +
> +#endif /* _ASM_ARCH_XHCI_ZYNQMP_H_ */