[U-Boot] [usb dwc3] xHCI driver -- a hint needed.

[Yuri Frolov]

Hi,

I've been trying to bring up a dwc3 usb controller included in 32-bit MIPS chip.
Usb is the one port usb2.0 host module, compliant with xHCI Revision 1.0, UTMI+ Low Pin interface (ULPI) Revision 1.1 and AMBA AXI Protocol specification. g_snpsid register reports 0x5533290a revision.

It's verified, that linux kernel support is ok, usb is fully functional.

	axi {
		<...>

		usb at 1F04D050 {
			compatible = "be,baikal-dwc3";
			reg = <0x1f04d050 0x4>;
			interrupts = <0x0 0x45 0x4>;
			#address-cells = <0x1>;
			#size-cells = <0x1>;
			clocks = <0xf 0x0>;
			clock-names = "usb";
			ranges;
			status = "okay";

			dwc3 at 1F100000 {
				compatible = "snps,dwc3", "synopsys,dwc3", "generic-xhci";
				reg = <0x1f100000 0x10000>;
				interrupts = <0x0 0x44 0x4>;
				dr_mode = "host";
				tx-fifo-resize;
				maximum-speed = "high-speed";
			};
		};
	};

whereas in u-boot 'usb start' fails on hub initialization (as I can see):

Any ideas why this could happen?.. Any direction where to look at?
Any suggestions will be greatly appreciated.

# usb start
(Re)start USB...
USB0:   dwc3_reg->g_snpsid: 0x5533290a
Register 1000140 NbrPorts 1
Starting the controller
USB XHCI 1.00
scanning bus 0 for devices... New Device 0
set address 1
usb_control_msg: request: 0x5, requesttype: 0x0, value 0x1 index 0x0 length 0x0
usb_control_msg: request: 0x6, requesttype: 0x80, value 0x100 index 0x0 length 0x12
usb_control_msg: request: 0x6, requesttype: 0x80, value 0x200 index 0x0 length 0x9
usb_control_msg: request: 0x6, requesttype: 0x80, value 0x200 index 0x0 length 0x1F
get_conf_no 0 Result 25, wLength 31
if 0, ep 0
##EP epmaxpacketin[1] = 8
set configuration 1
usb_control_msg: request: 0x9, requesttype: 0x0, value 0x1 index 0x0 length 0x0
new device strings: Mfr=1, Product=2, SerialNumber=0
usb_control_msg: request: 0x6, requesttype: 0x80, value 0x300 index 0x0 length 0xFF
USB device number 1 default language ID 0x409
usb_control_msg: request: 0x6, requesttype: 0x80, value 0x301 index 0x409 length 0xFF
usb_control_msg: request: 0x6, requesttype: 0x80, value 0x302 index 0x409 length 0xFF
Manufacturer U-Boot
Product      XHCI Host Controller
SerialNumber
USB hub found
usb_control_msg: request: 0x6, requesttype: 0xA0, value 0x2A00 index 0x0 length 0x4
usb_control_msg: request: 0x6, requesttype: 0xA0, value 0x2A00 index 0x0 length 0xC
1 ports detected
ganged power switching
standalone hub
individual port over-current protection
TT requires at most 8 FS bit times (666 ns)
power on to power good time: 20ms
hub controller current requirement: 0mA
port 1 is removable
usb_control_msg: request: 0x0, requesttype: 0xA0, value 0x0 index 0x0 length 0x4
get_hub_status returned status 1, change 801
local power source is lost (inactive)
no over-current condition exists
enabling power on all ports
usb_control_msg: request: 0x3, requesttype: 0x23, value 0x8 index 0x1 length 0x0
port 1 returns 0
devnum=1 poweron: query_delay=100 connect_timeout=1100
usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1 length 0x4
Port 1 Status 101 Change 1
devnum=1 port=1: USB dev found
usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1 length 0x4
portstatus 101, change 1, 12 Mb/s
usb_control_msg: request: 0x1, requesttype: 0x23, value 0x10 index 0x1 length 0x0
usb_hub_port_reset: resetting port 1...
usb_control_msg: request: 0x3, requesttype: 0x23, value 0x4 index 0x1 length 0x0
usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1 length 0x4
portstatus 111, change 0, 12 Mb/s
STAT_C_CONNECTION = 0 STAT_CONNECTION = 1  USB_PORT_STAT_ENABLE 0
usb_control_msg: request: 0x3, requesttype: 0x23, value 0x4 index 0x1 length 0x0
usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x1 length 0x4
portstatus 503, change 10, 480 Mb/s
STAT_C_CONNECTION = 0 STAT_CONNECTION = 1  USB_PORT_STAT_ENABLE 1
usb_control_msg: request: 0x1, requesttype: 0x23, value 0x14 index 0x1 length 0x0
New Device 1
XHCI timeout on event type 33... cannot recover.
BUG: failure at drivers/usb/host/xhci-ring.c:474/xhci_wait_for_event()!
BUG!
Reset CPU by CPC

Here is the drivers/usb/host/xhci-baikal.c:

#include <common.h>
#include <usb.h>
#include <linux/errno.h>

#include <linux/compat.h>
#include <linux/usb/dwc3.h>
#include <linux/usb/xhci-omap.h>

#include "xhci.h"

/* Declare global data pointer */
DECLARE_GLOBAL_DATA_PTR;

struct baikal_xhci {
	struct xhci_hccr *hcd;
	struct dwc3 *dwc3_reg;
};

static struct baikal_xhci baikal;

int __attribute__((weak)) board_usb_init(int index, enum usb_init_type init);

static int baikal_xhci_core_init(struct baikal_xhci *baikal)
{
	int ret = 0;

	ret = dwc3_core_init(baikal->dwc3_reg);
	if (ret) {
		debug("%s:failed to initialize core\n", __func__);
		return ret;
	}

	/* We are hard-coding DWC3 core to Host Mode */
	dwc3_set_mode(baikal->dwc3_reg, DWC3_GCTL_PRTCAP_HOST);

	return ret;
}

static void baikal_xhci_core_exit(struct baikal_xhci *baikal)
{
}

int xhci_hcd_init(int index, struct xhci_hccr **hccr, struct xhci_hcor **hcor)
{
	struct baikal_xhci *ctx = &baikal;
	int ret = 0;

	ctx->hcd = (struct xhci_hccr *)CONFIG_USB_XHCI_BAIKAL_BASE;
	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 = baikal_xhci_core_init(ctx);
	if (ret < 0) {
		puts("Failed to initialize xhci\n");
		return ret;
	}

	*hccr = (struct xhci_hccr *)(CONFIG_USB_XHCI_BAIKAL_BASE);
	*hcor = (struct xhci_hcor *)((uint32_t) *hccr
				+ HC_LENGTH(xhci_readl(&(*hccr)->cr_capbase)));

	debug("baikal-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)
{
}

TIA,
Yuri