/*
 * 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);
}
ption value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><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>Linus Walleij &lt;linus.walleij@linaro.org&gt;</td><td class='right'>2016-11-12 15:22:38 +0100</td></tr>
<tr><th>committer</th><td>Mark Brown &lt;broonie@kernel.org&gt;</td><td class='right'>2016-11-13 09:22:37 +0000</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/phy/phy-msm-usb.c?id=295070e9aa015abb9b92cccfbb1e43954e938133'>295070e9aa015abb9b92cccfbb1e43954e938133</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/phy/phy-msm-usb.c?id=295070e9aa015abb9b92cccfbb1e43954e938133'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=295070e9aa015abb9b92cccfbb1e43954e938133'>d0a08e7ce280bc877e22424437dbe59fa1857d9a</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/phy/phy-msm-usb.c?id=295070e9aa015abb9b92cccfbb1e43954e938133'>drivers/usb/phy/phy-msm-usb.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/phy/phy-msm-usb.c?id=1001354ca34179f3db924eb66672442a173147dc'>1001354ca34179f3db924eb66672442a173147dc</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/phy/phy-msm-usb.c?id=295070e9aa015abb9b92cccfbb1e43954e938133&amp;id2=1001354ca34179f3db924eb66672442a173147dc'>diff</a>)</td></tr></table>
<div class='commit-subject'>regulator: stw481x-vmmc: fix ages old enable error</div><div class='commit-msg'>The regulator has never been properly enabled, it has been
dormant all the time. It's strange that MMC was working
at all, but it likely worked by the signals going through
the levelshifter and reaching the card anyways.

Fixes: 3615a34ea1a6 ("regulator: add STw481x VMMC driver")
Signed-off-by: Linus Walleij &lt;linus.walleij@linaro.org&gt;
Signed-off-by: Mark Brown &lt;broonie@kernel.org&gt;
Cc: stable@vger.kernel.org
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=295070e9aa015abb9b92cccfbb1e43954e938133'>Diffstat</a> (limited to 'drivers/usb/phy/phy-msm-usb.c')</div><table summary='diffstat' class='diffstat'>