/*
 * otg.c - ChipIdea USB IP core OTG driver
 *
 * Copyright (C) 2013 Freescale Semiconductor, Inc.
 *
 * Author: Peter Chen
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

/*
 * This file mainly handles otgsc register, OTG fsm operations for HNP and SRP
 * are also included.
 */

#include <linux/usb/otg.h>
#include <linux/usb/gadget.h>
#include <linux/usb/chipidea.h>

#include "ci.h"
#include "bits.h"
#include "otg.h"
#include "otg_fsm.h"

/**
 * hw_read_otgsc returns otgsc register bits value.
 * @mask: bitfield mask
 */
u32 hw_read_otgsc(struct ci_hdrc *ci, u32 mask)
{
	struct ci_hdrc_cable *cable;
	u32 val = hw_read(ci, OP_OTGSC, mask);

	/*
	 * If using extcon framework for VBUS and/or ID signal
	 * detection overwrite OTGSC register value
	 */
	cable = &ci->platdata->vbus_extcon;
	if (!IS_ERR(cable->edev)) {
		if (cable->changed)
			val |= OTGSC_BSVIS;
		else
			val &= ~OTGSC_BSVIS;

		cable->changed = false;

		if (cable->state)
			val |= OTGSC_BSV;
		else
			val &= ~OTGSC_BSV;
	}

	cable = &ci->platdata->id_extcon;
	if (!IS_ERR(cable->edev)) {
		if (cable->changed)
			val |= OTGSC_IDIS;
		else
			val &= ~OTGSC_IDIS;

		cable->changed = false;

		if (cable->state)
			val |= OTGSC_ID;
		else
			val &= ~OTGSC_ID;
	}

	return val;
}

/**
 * hw_write_otgsc updates target bits of OTGSC register.
 * @mask: bitfield mask
 * @data: to be written
 */
void hw_write_otgsc(struct ci_hdrc *ci, u32 mask, u32 data)
{
	hw_write(ci, OP_OTGSC, mask | OTGSC_INT_STATUS_BITS, data);
}

/**
 * ci_otg_role - pick role based on ID pin state
 * @ci: the controller
 */
enum ci_role ci_otg_role(struct ci_hdrc *ci)
{
	enum ci_role role = hw_read_otgsc(ci, OTGSC_ID)
		? CI_ROLE_GADGET
		: CI_ROLE_HOST;

	return role;
}

void ci_handle_vbus_change(struct ci_hdrc *ci)
{
	if (!ci->is_otg)
		return;

	if (hw_read_otgsc(ci, OTGSC_BSV))
		usb_gadget_vbus_connect(&ci->gadget);
	else
		usb_gadget_vbus_disconnect(&ci->gadget);
}

#define CI_VBUS_STABLE_TIMEOUT_MS 5000
static void ci_handle_id_switch(struct ci_hdrc *ci)
{
	enum ci_role role = ci_otg_role(ci);

	if (role != ci->role) {
		dev_dbg(ci->dev, "switching from %s to %s\n",
			ci_role(ci)->name, ci->roles[role]->name);

		ci_role_stop(ci);

		if (role == CI_ROLE_GADGET)
			/* wait vbus lower than OTGSC_BSV */
			hw_wait_reg(ci, OP_OTGSC, OTGSC_BSV, 0,
					CI_VBUS_STABLE_TIMEOUT_MS);

		ci_role_start(ci, role);
	}
}
/**
 * ci_otg_work - perform otg (vbus/id) event handle
 * @work: work struct
 */
static void ci_otg_work(struct work_struct *work)
{
	struct ci_hdrc *ci = container_of(work, struct ci_hdrc, work);

	if (ci_otg_is_fsm_mode(ci) && !ci_otg_fsm_work(ci)) {
		enable_irq(ci->irq);
		return;
	}

	pm_runtime_get_sync(ci->dev);
	if (ci->id_event) {
		ci->id_event = false;
		ci_handle_id_switch(ci);
	} else if (ci->b_sess_valid_event) {
		ci->b_sess_valid_event = false;
		ci_handle_vbus_change(ci);
	} else
		dev_err(ci->dev, "unexpected event occurs at %s\n", __func__);
	pm_runtime_put_sync(ci->dev);

	enable_irq(ci->irq);
}


/**
 * ci_hdrc_otg_init - initialize otg struct
 * ci: the controller
 */
int ci_hdrc_otg_init(struct ci_hdrc *ci)
{
	INIT_WORK(&ci->work, ci_otg_work);
	ci->wq = create_freezable_workqueue("ci_otg");
	if (!ci->wq) {
		dev_err(ci->dev, "can't create workqueue\n");
		return -ENODEV;
	}

	if (ci_otg_is_fsm_mode(ci))
		return ci_hdrc_otg_fsm_init(ci);

	return 0;
}

/**
 * ci_hdrc_otg_destroy - destroy otg struct
 * ci: the controller
 */
void ci_hdrc_otg_destroy(struct ci_hdrc *ci)
{
	if (ci->wq) {
		flush_workqueue(ci->wq);
		destroy_workqueue(ci->wq);
	}
	/* Disable all OTG irq and clear status */
	hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
						OTGSC_INT_STATUS_BITS);
	if (ci_otg_is_fsm_mode(ci))
		ci_hdrc_otg_fsm_remove(ci);
}
ion><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Alexander Stein &lt;alexander.stein@systec-electronic.com&gt;</td><td class='right'>2017-01-30 12:35:28 +0100</td></tr>
<tr><th>committer</th><td>Linus Walleij &lt;linus.walleij@linaro.org&gt;</td><td class='right'>2017-01-30 15:53:57 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/virtio?id=cdca06e4e85974d8a3503ab15709dbbaf90d3dd1'>cdca06e4e85974d8a3503ab15709dbbaf90d3dd1</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/virtio?id=cdca06e4e85974d8a3503ab15709dbbaf90d3dd1'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=cdca06e4e85974d8a3503ab15709dbbaf90d3dd1'>268b0c01070a957006db97c88dccb5fb061440ff</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/virtio?id=cdca06e4e85974d8a3503ab15709dbbaf90d3dd1'>tools/virtio</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/virtio?id=1b89970d81bbd52720fc64a3fe9572ee33588363'>1b89970d81bbd52720fc64a3fe9572ee33588363</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/virtio?id=cdca06e4e85974d8a3503ab15709dbbaf90d3dd1&amp;id2=1b89970d81bbd52720fc64a3fe9572ee33588363'>diff</a>)</td></tr></table>
<div class='commit-subject'>pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq_handler</div><div class='commit-msg'>According to VLI64 Intel Atom E3800 Specification Update (#329901)
concurrent read accesses may result in returning 0xffffffff and write
accesses may be dropped silently.
To workaround all accesses must be protected by locks.

Cc: stable@vger.kernel.org
Signed-off-by: Alexander Stein &lt;alexander.stein@systec-electronic.com&gt;
Acked-by: Mika Westerberg &lt;mika.westerberg@linux.intel.com&gt;
Signed-off-by: Linus Walleij &lt;linus.walleij@linaro.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=cdca06e4e85974d8a3503ab15709dbbaf90d3dd1'>Diffstat</a> (limited to 'tools/virtio')</div><table summary='diffstat' class='diffstat'>