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// SPDX-License-Identifier: GPL-2.0+
/*
 * Most of this source has been derived from the Linux USB
 * project:
 * (C) Copyright Linus Torvalds 1999
 * (C) Copyright Johannes Erdfelt 1999-2001
 * (C) Copyright Andreas Gal 1999
 * (C) Copyright Gregory P. Smith 1999
 * (C) Copyright Deti Fliegl 1999 (new USB architecture)
 * (C) Copyright Randy Dunlap 2000
 * (C) Copyright David Brownell 2000 (kernel hotplug, usb_device_id)
 * (C) Copyright Yggdrasil Computing, Inc. 2000
 *     (usb_device_id matching changes by Adam J. Richter)
 *
 * Adapted for U-Boot:
 * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
 */

/****************************************************************************
 * HUB "Driver"
 * Probes device for being a hub and configurate it
 */

#include <common.h>
#include <command.h>
#include <dm.h>
#include <env.h>
#include <errno.h>
#include <malloc.h>
#include <memalign.h>
#include <asm/processor.h>
#include <asm/unaligned.h>
#include <linux/ctype.h>
#include <linux/list.h>
#include <asm/byteorder.h>
#ifdef CONFIG_SANDBOX
#include <asm/state.h>
#endif
#include <asm/unaligned.h>

#include <usb.h>

#define USB_BUFSIZ	512

#define HUB_SHORT_RESET_TIME	20
#define HUB_LONG_RESET_TIME	200

#define PORT_OVERCURRENT_MAX_SCAN_COUNT		3

struct usb_device_scan {
	struct usb_device *dev;		/* USB hub device to scan */
	struct usb_hub_device *hub;	/* USB hub struct */
	int port;			/* USB port to scan */
	struct list_head list;
};

static LIST_HEAD(usb_scan_list);

__weak void usb_hub_reset_devices(struct usb_hub_device *hub, int port)
{
	return;
}

static inline bool usb_hub_is_superspeed(struct usb_device *hdev)
{
	return hdev->descriptor.bDeviceProtocol == 3;
}

#if CONFIG_IS_ENABLED(DM_USB)
bool usb_hub_is_root_hub(struct udevice *hub)
{
	if (device_get_uclass_id(hub->parent) != UCLASS_USB_HUB)
		return true;

	return false;
}

static int usb_set_hub_depth(struct usb_device *dev, int depth)
{
	if (depth < 0 || depth > 4)
		return -EINVAL;

	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
		USB_REQ_SET_HUB_DEPTH, USB_DIR_OUT | USB_RT_HUB,
		depth, 0, NULL, 0, USB_CNTL_TIMEOUT);
}
#endif

static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
{
	unsigned short dtype = USB_DT_HUB;

	if (usb_hub_is_superspeed(dev))
		dtype = USB_DT_SS_HUB;

	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
		USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
		dtype << 8, 0, data, size, USB_CNTL_TIMEOUT);
}

static int usb_clear_port_feature(struct usb_device *dev, int port, int feature)
{
	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature,
				port, NULL, 0, USB_CNTL_TIMEOUT);
}

static int usb_set_port_feature(struct usb_device *dev, int port, int feature)
{
	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				USB_REQ_SET_FEATURE, USB_RT_PORT, feature,
				port, NULL, 0, USB_CNTL_TIMEOUT);
}

static int usb_get_hub_status(struct usb_device *dev, void *data)
{
	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
			data, sizeof(struct usb_hub_status), USB_CNTL_TIMEOUT);
}

int usb_get_port_status(struct usb_device *dev, int port, void *data)
{
	int ret;

	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
			USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
			data, sizeof(struct usb_port_status), USB_CNTL_TIMEOUT);

#if CONFIG_IS_ENABLED(DM_USB)
	if (ret < 0)
		return ret;

	/*
	 * Translate the USB 3.0 hub port status field into the old version
	 * that U-Boot understands. Do this only when the hub is not root hub.
	 * For root hub, the port status field has already been translated
	 * in the host controller driver (see xhci_submit_root() in xhci.c).
	 *
	 * Note: this only supports driver model.
	 */

	if (!usb_hub_is_root_hub(dev->dev) && usb_hub_is_superspeed(dev)) {
		struct usb_port_status *status = (struct usb_port_status *)data;
		u16 tmp = (status->wPortStatus) & USB_SS_PORT_STAT_MASK;

		if (status->wPortStatus & USB_SS_PORT_STAT_POWER)
			tmp |= USB_PORT_STAT_POWER;
		if ((status->wPortStatus & USB_SS_PORT_STAT_SPEED) ==
		    USB_SS_PORT_STAT_SPEED_5GBPS)
			tmp |= USB_PORT_STAT_SUPER_SPEED;

		status->wPortStatus = tmp;
	}
#endif

	return ret;
}


static void usb_hub_power_on(struct usb_hub_device *hub)
{
	int i;
	struct usb_device *dev;
	unsigned pgood_delay = hub->desc.bPwrOn2PwrGood * 2;
	const char *env;

	dev = hub->pusb_dev;

	debug("enabling power on all ports\n");
	for (i = 0; i < dev->maxchild; i++) {
		usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
		debug("port %d returns %lX\n", i + 1, dev->status);
	}

#ifdef CONFIG_SANDBOX
	/*
	 * Don't set timeout / delay values here. This results
	 * in these values still being reset to 0.
	 */
	if (state_get_skip_delays())
		return;
#endif

	/*
	 * Wait for power to become stable,
	 * plus spec-defined max time for device to connect
	 * but allow this time to be increased via env variable as some
	 * devices break the spec and require longer warm-up times
	 */
	env = env_get("usb_pgood_delay");
	if (env)
		pgood_delay = max(pgood_delay,
			          (unsigned)simple_strtol(env, NULL, 0));
	debug("pgood_delay=%dms\n", pgood_delay);

	/*
	 * Do a minimum delay of the larger value of 100ms or pgood_delay
	 * so that the power can stablize before the devices are queried
	 */
	hub->query_delay = get_timer(0) + max(100, (int)pgood_delay);

	/*
	 * Record the power-on timeout here. The max. delay (timeout)
	 * will be done based on this value in the USB port loop in
	 * usb_hub_configure() later.
	 */
	hub->connect_timeout = hub->query_delay + 1000;
	debug("devnum=%d poweron: query_delay=%d connect_timeout=%d\n",
	      dev->devnum, max(100, (int)pgood_delay),
	      max(100, (int)pgood_delay) + 1000);
}

#if !CONFIG_IS_ENABLED(DM_USB)
static struct usb_hub_device hub_dev[USB_MAX_HUB];
static int usb_hub_index;

void usb_hub_reset(void)
{
	usb_hub_index = 0;

	/* Zero out global hub_dev in case its re-used again */
	memset(hub_dev, 0, sizeof(hub_dev));
}

static struct usb_hub_device *usb_hub_allocate(void)
{
	if (usb_hub_index < USB_MAX_HUB)
		return &hub_dev[usb_hub_index++];

	printf("ERROR: USB_MAX_HUB (%d) reached\n", USB_MAX_HUB);
	return NULL;
}
#endif

#define MAX_TRIES 5

static inline const char *portspeed(int portstatus)
{
	switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
	case USB_PORT_STAT_SUPER_SPEED:
		return "5 Gb/s";
	case USB_PORT_STAT_HIGH_SPEED:
		return "480 Mb/s";
	case USB_PORT_STAT_LOW_SPEED:
		return "1.5 Mb/s";
	default:
		return "12 Mb/s";
	}
}

/**
 * usb_hub_port_reset() - reset a port given its usb_device pointer
 *
 * Reset a hub port and see if a device is present on that port, providing
 * sufficient time for it to show itself. The port status is returned.
 *
 * @dev:	USB device to reset
 * @port:	Port number to reset (note ports are numbered from 0 here)
 * @portstat:	Returns port status
 */
static int usb_hub_port_reset(struct usb_device *dev, int port,
			      unsigned short *portstat)
{
	int err, tries;
	ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
	unsigned short portstatus, portchange;
	int delay = HUB_SHORT_RESET_TIME; /* start with short reset delay */

#if CONFIG_IS_ENABLED(DM_USB)
	debug("%s: resetting '%s' port %d...\n", __func__, dev->dev->name,
	      port + 1);
#else
	debug("%s: resetting port %d...\n", __func__, port + 1);
#endif
	for (tries = 0; tries < MAX_TRIES; tries++) {
		err = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
		if (err < 0)
			return err;

		mdelay(delay);

		if (usb_get_port_status(dev, port + 1, portsts) < 0) {
			debug("get_port_status failed status %lX\n",
			      dev->status);
			return -1;
		}
		portstatus = le16_to_cpu(portsts->wPortStatus);
		portchange = le16_to_cpu(portsts->wPortChange);

		debug("portstatus %x, change %x, %s\n", portstatus, portchange,
							portspeed(portstatus));

		debug("STAT_C_CONNECTION = %d STAT_CONNECTION = %d" \
		      "  USB_PORT_STAT_ENABLE %d\n",
		      (portchange & USB_PORT_STAT_C_CONNECTION) ? 1 : 0,
		      (portstatus & USB_PORT_STAT_CONNECTION) ? 1 : 0,
		      (portstatus & USB_PORT_STAT_ENABLE) ? 1 : 0);

		/*
		 * Perhaps we should check for the following here:
		 * - C_CONNECTION hasn't been set.
		 * - CONNECTION is still set.
		 *
		 * Doing so would ensure that the device is still connected
		 * to the bus, and hasn't been unplugged or replaced while the
		 * USB bus reset was going on.
		 *
		 * However, if we do that, then (at least) a San Disk Ultra
		 * USB 3.0 16GB device fails to reset on (at least) an NVIDIA
		 * Tegra Jetson TK1 board. For some reason, the device appears
		 * to briefly drop off the bus when this second bus reset is
		 * executed, yet if we retry this loop, it'll eventually come
		 * back after another reset or two.
		 */

		if (portstatus & USB_PORT_STAT_ENABLE)
			break;

		/* Switch to long reset delay for the next round */
		delay = HUB_LONG_RESET_TIME;
	}

	if (tries == MAX_TRIES) {
		debug("Cannot enable port %i after %i retries, " \
		      "disabling port.\n", port + 1, MAX_TRIES);
		debug("Maybe the USB cable is bad?\n");
		return -1;
	}

	usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_RESET);
	*portstat = portstatus;
	return 0;
}

int usb_hub_port_connect_change(struct usb_device *dev, int port)
{
	ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
	unsigned short portstatus;
	int ret, speed;

	/* Check status */
	ret = usb_get_port_status(dev, port + 1, portsts);
	if (ret < 0) {
		debug("get_port_status failed\n");
		return ret;
	}

	portstatus = le16_to_cpu(portsts->wPortStatus);
	debug("portstatus %x, change %x, %s\n",
	      portstatus,
	      le16_to_cpu(portsts->wPortChange),
	      portspeed(portstatus));

	/* Clear the connection change status */
	usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_C_CONNECTION);

	/* Disconnect any existing devices under this port */
	if (((!(portstatus & USB_PORT_STAT_CONNECTION)) &&
	     (!(portstatus & USB_PORT_STAT_ENABLE))) ||
	    usb_device_has_child_on_port(dev, port)) {
		debug("usb_disconnect(&hub->children[port]);\n");
		/* Return now if nothing is connected */
		if (!(portstatus & USB_PORT_STAT_CONNECTION))
			return -ENOTCONN;
	}

	/* Reset the port */
	ret = usb_hub_port_reset(dev, port, &portstatus);
	if (ret < 0) {
		if (ret != -ENXIO)
			printf("cannot reset port %i!?\n", port + 1);
		return ret;
	}

	switch (portstatus & USB_PORT_STAT_SPEED_MASK) {
	case USB_PORT_STAT_SUPER_SPEED:
		speed = USB_SPEED_SUPER;
		break;
	case USB_PORT_STAT_HIGH_SPEED:
		speed = USB_SPEED_HIGH;
		break;
	case USB_PORT_STAT_LOW_SPEED:
		speed = USB_SPEED_LOW;
		break;
	default:
		speed = USB_SPEED_FULL;
		break;
	}

#if CONFIG_IS_ENABLED(DM_USB)
	struct udevice *child;

	ret = usb_scan_device(dev->dev, port + 1, speed, &child);
#else
	struct usb_device *usb;

	ret = usb_alloc_new_device(dev->controller, &usb);
	if (ret) {
		printf("cannot create new device: ret=%d", ret);
		return ret;
	}

	dev->children[port] = usb;
	usb->speed = speed;
	usb->parent = dev;
	usb->portnr = port + 1;
	/* Run it through the hoops (find a driver, etc) */
	ret = usb_new_device(usb);
	if (ret < 0) {
		/* Woops, disable the port */
		usb_free_device(dev->controller);
		dev->children[port] = NULL;
	}
#endif
	if (ret < 0) {
		debug("hub: disabling port %d\n", port + 1);
		usb_clear_port_feature(dev, port + 1, USB_PORT_FEAT_ENABLE);
	}

	return ret;
}

static int usb_scan_port(struct usb_device_scan *usb_scan)
{
	ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
	unsigned short portstatus;
	unsigned short portchange;
	struct usb_device *dev;
	struct usb_hub_device *hub;
	int ret = 0;
	int i;

	dev = usb_scan->dev;
	hub = usb_scan->hub;
	i = usb_scan->port;

	/*
	 * Don't talk to the device before the query delay is expired.
	 * This is needed for voltages to stabalize.
	 */
	if (get_timer(0) < hub->query_delay)
		return 0;

	ret = usb_get_port_status(dev, i + 1, portsts);
	if (ret < 0) {
		debug("get_port_status failed\n");
		if (get_timer(0) >= hub->connect_timeout) {
			debug("devnum=%d port=%d: timeout\n",
			      dev->devnum, i + 1);
			/* Remove this device from scanning list */
			list_del(&usb_scan->list);
			free(usb_scan);
			return 0;
		}
		return 0;
	}

	portstatus = le16_to_cpu(portsts->wPortStatus);
	portchange = le16_to_cpu(portsts->wPortChange);
	debug("Port %d Status %X Change %X\n", i + 1, portstatus, portchange);

	/*
	 * No connection change happened, wait a bit more.
	 *
	 * For some situation, the hub reports no connection change but a
	 * device is connected to the port (eg: CCS bit is set but CSC is not
	 * in the PORTSC register of a root hub), ignore such case.
	 */
	if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
	    !(portstatus & USB_PORT_STAT_CONNECTION)) {
		if (get_timer(0) >= hub->connect_timeout) {
			debug("devnum=%d port=%d: timeout\n",
			      dev->devnum, i + 1);
			/* Remove this device from scanning list */
			list_del(&usb_scan->list);
			free(usb_scan);
			return 0;
		}
		return 0;
	}

	if (portchange & USB_PORT_STAT_C_RESET) {
		debug("port %d reset change\n", i + 1);
		usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET);
	}

	if ((portchange & USB_SS_PORT_STAT_C_BH_RESET) &&
	    usb_hub_is_superspeed(dev)) {
		debug("port %d BH reset change\n", i + 1);
		usb_clear_port_feature(dev, i + 1, USB_SS_PORT_FEAT_C_BH_RESET);
	}

	/* A new USB device is ready at this point */
	debug("devnum=%d port=%d: USB dev found\n", dev->devnum, i + 1);

	usb_hub_port_connect_change(dev, i);

	if (portchange & USB_PORT_STAT_C_ENABLE) {
		debug("port %d enable change, status %x\n", i + 1, portstatus);
		usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE);
		/*
		 * The following hack causes a ghost device problem
		 * to Faraday EHCI
		 */
#ifndef CONFIG_USB_EHCI_FARADAY
		/*
		 * EM interference sometimes causes bad shielded USB
		 * devices to be shutdown by the hub, this hack enables
		 * them again. Works at least with mouse driver
		 */
		if (!(portstatus & USB_PORT_STAT_ENABLE) &&
		    (portstatus & USB_PORT_STAT_CONNECTION) &&
		    usb_device_has_child_on_port(dev, i)) {
			debug("already running port %i disabled by hub (EMI?), re-enabling...\n",
			      i + 1);
			usb_hub_port_connect_change(dev, i);
		}
#endif
	}

	if (portstatus & USB_PORT_STAT_SUSPEND) {
		debug("port %d suspend change\n", i + 1);
		usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_SUSPEND);
	}

	if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
		debug("port %d over-current change\n", i + 1);
		usb_clear_port_feature(dev, i + 1,
				       USB_PORT_FEAT_C_OVER_CURRENT);
		/* Only power-on this one port */
		usb_set_port_feature(dev, i + 1, USB_PORT_FEAT_POWER);
		hub->overcurrent_count[i]++;

		/*
		 * If the max-scan-count is not reached, return without removing
		 * the device from scan-list. This will re-issue a new scan.
		 */
		if (hub->overcurrent_count[i] <=
		    PORT_OVERCURRENT_MAX_SCAN_COUNT)
			return 0;

		/* Otherwise the device will get removed */
		printf("Port %d over-current occurred %d times\n", i + 1,
		       hub->overcurrent_count[i]);
	}

	/*
	 * We're done with this device, so let's remove this device from
	 * scanning list
	 */
	list_del(&usb_scan->list);
	free(usb_scan);

	return 0;
}

static int usb_device_list_scan(void)
{
	struct usb_device_scan *usb_scan;