blob: caaabc58021efeff0918d11e26bbc6a6d7036a3e [file] [log] [blame]
/*
* otg_fsm.c - ChipIdea USB IP core OTG FSM driver
*
* Copyright (C) 2014 Freescale Semiconductor, Inc.
*
* Author: Jun Li
*
* 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 OTG fsm, it includes OTG fsm operations
* for HNP and SRP.
*
* TODO List
* - ADP
* - OTG test device
*/
#include <linux/usb/otg.h>
#include <linux/usb/gadget.h>
#include <linux/usb/hcd.h>
#include <linux/usb/chipidea.h>
#include <linux/regulator/consumer.h>
#include "ci.h"
#include "bits.h"
#include "otg.h"
#include "otg_fsm.h"
static struct ci_otg_fsm_timer *otg_timer_initializer
(struct ci_hdrc *ci, void (*function)(void *, unsigned long),
unsigned long expires, unsigned long data)
{
struct ci_otg_fsm_timer *timer;
timer = devm_kzalloc(ci->dev, sizeof(struct ci_otg_fsm_timer),
GFP_KERNEL);
if (!timer)
return NULL;
timer->function = function;
timer->expires = expires;
timer->data = data;
return timer;
}
/* Add for otg: interact with user space app */
static ssize_t
get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
{
char *next;
unsigned size, t;
struct ci_hdrc *ci = dev_get_drvdata(dev);
next = buf;
size = PAGE_SIZE;
t = scnprintf(next, size, "%d\n", ci->fsm.a_bus_req);
size -= t;
next += t;
return PAGE_SIZE - size;
}
static ssize_t
set_a_bus_req(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct ci_hdrc *ci = dev_get_drvdata(dev);
if (count > 2)
return -1;
mutex_lock(&ci->fsm.lock);
if (buf[0] == '0') {
ci->fsm.a_bus_req = 0;
} else if (buf[0] == '1') {
/* If a_bus_drop is TRUE, a_bus_req can't be set */
if (ci->fsm.a_bus_drop) {
mutex_unlock(&ci->fsm.lock);
return count;
}
ci->fsm.a_bus_req = 1;
}
ci_otg_queue_work(ci);
mutex_unlock(&ci->fsm.lock);
return count;
}
static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req, set_a_bus_req);
static ssize_t
get_a_bus_drop(struct device *dev, struct device_attribute *attr, char *buf)
{
char *next;
unsigned size, t;
struct ci_hdrc *ci = dev_get_drvdata(dev);
next = buf;
size = PAGE_SIZE;
t = scnprintf(next, size, "%d\n", ci->fsm.a_bus_drop);
size -= t;
next += t;
return PAGE_SIZE - size;
}
static ssize_t
set_a_bus_drop(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct ci_hdrc *ci = dev_get_drvdata(dev);
if (count > 2)
return -1;
mutex_lock(&ci->fsm.lock);
if (buf[0] == '0') {
ci->fsm.a_bus_drop = 0;
} else if (buf[0] == '1') {
ci->fsm.a_bus_drop = 1;
ci->fsm.a_bus_req = 0;
}
ci_otg_queue_work(ci);
mutex_unlock(&ci->fsm.lock);
return count;
}
static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR, get_a_bus_drop,
set_a_bus_drop);
static ssize_t
get_b_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
{
char *next;
unsigned size, t;
struct ci_hdrc *ci = dev_get_drvdata(dev);
next = buf;
size = PAGE_SIZE;
t = scnprintf(next, size, "%d\n", ci->fsm.b_bus_req);
size -= t;
next += t;
return PAGE_SIZE - size;
}
static ssize_t
set_b_bus_req(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct ci_hdrc *ci = dev_get_drvdata(dev);
if (count > 2)
return -1;
mutex_lock(&ci->fsm.lock);
if (buf[0] == '0')
ci->fsm.b_bus_req = 0;
else if (buf[0] == '1')
ci->fsm.b_bus_req = 1;
ci_otg_queue_work(ci);
mutex_unlock(&ci->fsm.lock);
return count;
}
static DEVICE_ATTR(b_bus_req, S_IRUGO | S_IWUSR, get_b_bus_req, set_b_bus_req);
static ssize_t
set_a_clr_err(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct ci_hdrc *ci = dev_get_drvdata(dev);
if (count > 2)
return -1;
mutex_lock(&ci->fsm.lock);
if (buf[0] == '1')
ci->fsm.a_clr_err = 1;
ci_otg_queue_work(ci);
mutex_unlock(&ci->fsm.lock);
return count;
}
static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
static struct attribute *inputs_attrs[] = {
&dev_attr_a_bus_req.attr,
&dev_attr_a_bus_drop.attr,
&dev_attr_b_bus_req.attr,
&dev_attr_a_clr_err.attr,
NULL,
};
static struct attribute_group inputs_attr_group = {
.name = "inputs",
.attrs = inputs_attrs,
};
/*
* Add timer to active timer list
*/
static void ci_otg_add_timer(struct ci_hdrc *ci, enum ci_otg_fsm_timer_index t)
{
struct ci_otg_fsm_timer *tmp_timer;
struct ci_otg_fsm_timer *timer = ci->fsm_timer->timer_list[t];
struct list_head *active_timers = &ci->fsm_timer->active_timers;
if (t >= NUM_CI_OTG_FSM_TIMERS)
return;
/*
* Check if the timer is already in the active list,
* if so update timer count
*/
list_for_each_entry(tmp_timer, active_timers, list)
if (tmp_timer == timer) {
timer->count = timer->expires;
return;
}
timer->count = timer->expires;
list_add_tail(&timer->list, active_timers);
/* Enable 1ms irq */
if (!(hw_read_otgsc(ci, OTGSC_1MSIE)))
hw_write_otgsc(ci, OTGSC_1MSIE, OTGSC_1MSIE);
}
/*
* Remove timer from active timer list
*/
static void ci_otg_del_timer(struct ci_hdrc *ci, enum ci_otg_fsm_timer_index t)
{
struct ci_otg_fsm_timer *tmp_timer, *del_tmp;
struct ci_otg_fsm_timer *timer = ci->fsm_timer->timer_list[t];
struct list_head *active_timers = &ci->fsm_timer->active_timers;
if (t >= NUM_CI_OTG_FSM_TIMERS)
return;
list_for_each_entry_safe(tmp_timer, del_tmp, active_timers, list)
if (tmp_timer == timer)
list_del(&timer->list);
/* Disable 1ms irq if there is no any active timer */
if (list_empty(active_timers))
hw_write_otgsc(ci, OTGSC_1MSIE, 0);
}
/*
* Reduce timer count by 1, and find timeout conditions.
* Called by otg 1ms timer interrupt
*/
static inline int ci_otg_tick_timer(struct ci_hdrc *ci)
{
struct ci_otg_fsm_timer *tmp_timer, *del_tmp;
struct list_head *active_timers = &ci->fsm_timer->active_timers;
int expired = 0;
list_for_each_entry_safe(tmp_timer, del_tmp, active_timers, list) {
tmp_timer->count--;
/* check if timer expires */
if (!tmp_timer->count) {
list_del(&tmp_timer->list);
tmp_timer->function(ci, tmp_timer->data);
expired = 1;
}
}
/* disable 1ms irq if there is no any timer active */
if ((expired == 1) && list_empty(active_timers))
hw_write_otgsc(ci, OTGSC_1MSIE, 0);
return expired;
}
/* The timeout callback function to set time out bit */
static void set_tmout(void *ptr, unsigned long indicator)
{
*(int *)indicator = 1;
}
static void set_tmout_and_fsm(void *ptr, unsigned long indicator)
{
struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
set_tmout(ci, indicator);
ci_otg_queue_work(ci);
}
static void a_wait_vfall_tmout_func(void *ptr, unsigned long indicator)
{
struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
set_tmout(ci, indicator);
/* Disable port power */
hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP, 0);
/* Clear exsiting DP irq */
hw_write_otgsc(ci, OTGSC_DPIS, OTGSC_DPIS);
/* Enable data pulse irq */
hw_write_otgsc(ci, OTGSC_DPIE, OTGSC_DPIE);
ci_otg_queue_work(ci);
}
static void b_ase0_brst_tmout_func(void *ptr, unsigned long indicator)
{
struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
set_tmout(ci, indicator);
if (!hw_read_otgsc(ci, OTGSC_BSV))
ci->fsm.b_sess_vld = 0;
ci_otg_queue_work(ci);
}
static void b_ssend_srp_tmout_func(void *ptr, unsigned long indicator)
{
struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
set_tmout(ci, indicator);
/* only vbus fall below B_sess_vld in b_idle state */
if (ci->transceiver->state == OTG_STATE_B_IDLE)
ci_otg_queue_work(ci);
}
static void b_sess_vld_tmout_func(void *ptr, unsigned long indicator)
{
struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
/* Check if A detached */
if (!(hw_read_otgsc(ci, OTGSC_BSV))) {
ci->fsm.b_sess_vld = 0;
ci_otg_add_timer(ci, B_SSEND_SRP);
ci_otg_queue_work(ci);
}
}
static void b_data_pulse_end(void *ptr, unsigned long indicator)
{
struct ci_hdrc *ci = (struct ci_hdrc *)ptr;
ci->fsm.b_srp_done = 1;
ci->fsm.b_bus_req = 0;
if (ci->fsm.power_up)
ci->fsm.power_up = 0;
hw_write_otgsc(ci, OTGSC_HABA, 0);
ci_otg_queue_work(ci);
}
/* Initialize timers */
static int ci_otg_init_timers(struct ci_hdrc *ci)
{
struct otg_fsm *fsm = &ci->fsm;
/* FSM used timers */
ci->fsm_timer->timer_list[A_WAIT_VRISE] =
otg_timer_initializer(ci, &set_tmout_and_fsm, TA_WAIT_VRISE,
(unsigned long)&fsm->a_wait_vrise_tmout);
if (ci->fsm_timer->timer_list[A_WAIT_VRISE] == NULL)
return -ENOMEM;
ci->fsm_timer->timer_list[A_WAIT_VFALL] =
otg_timer_initializer(ci, &a_wait_vfall_tmout_func,
TA_WAIT_VFALL, (unsigned long)&fsm->a_wait_vfall_tmout);
if (ci->fsm_timer->timer_list[A_WAIT_VFALL] == NULL)
return -ENOMEM;
ci->fsm_timer->timer_list[A_WAIT_BCON] =
otg_timer_initializer(ci, &set_tmout_and_fsm, TA_WAIT_BCON,
(unsigned long)&fsm->a_wait_bcon_tmout);
if (ci->fsm_timer->timer_list[A_WAIT_BCON] == NULL)
return -ENOMEM;
ci->fsm_timer->timer_list[A_AIDL_BDIS] =
otg_timer_initializer(ci, &set_tmout_and_fsm, TA_AIDL_BDIS,
(unsigned long)&fsm->a_aidl_bdis_tmout);
if (ci->fsm_timer->timer_list[A_AIDL_BDIS] == NULL)
return -ENOMEM;
ci->fsm_timer->timer_list[A_BIDL_ADIS] =
otg_timer_initializer(ci, &set_tmout_and_fsm, TA_BIDL_ADIS,
(unsigned long)&fsm->a_bidl_adis_tmout);
if (ci->fsm_timer->timer_list[A_BIDL_ADIS] == NULL)
return -ENOMEM;
ci->fsm_timer->timer_list[B_ASE0_BRST] =
otg_timer_initializer(ci, &b_ase0_brst_tmout_func, TB_ASE0_BRST,
(unsigned long)&fsm->b_ase0_brst_tmout);
if (ci->fsm_timer->timer_list[B_ASE0_BRST] == NULL)
return -ENOMEM;
ci->fsm_timer->timer_list[B_SE0_SRP] =
otg_timer_initializer(ci, &set_tmout_and_fsm, TB_SE0_SRP,
(unsigned long)&fsm->b_se0_srp);
if (ci->fsm_timer->timer_list[B_SE0_SRP] == NULL)
return -ENOMEM;
ci->fsm_timer->timer_list[B_SSEND_SRP] =
otg_timer_initializer(ci, &b_ssend_srp_tmout_func, TB_SSEND_SRP,
(unsigned long)&fsm->b_ssend_srp);
if (ci->fsm_timer->timer_list[B_SSEND_SRP] == NULL)
return -ENOMEM;
ci->fsm_timer->timer_list[B_SRP_FAIL] =
otg_timer_initializer(ci, &set_tmout, TB_SRP_FAIL,
(unsigned long)&fsm->b_srp_done);
if (ci->fsm_timer->timer_list[B_SRP_FAIL] == NULL)
return -ENOMEM;
ci->fsm_timer->timer_list[B_DATA_PLS] =
otg_timer_initializer(ci, &b_data_pulse_end, TB_DATA_PLS, 0);
if (ci->fsm_timer->timer_list[B_DATA_PLS] == NULL)
return -ENOMEM;
ci->fsm_timer->timer_list[B_SESS_VLD] = otg_timer_initializer(ci,
&b_sess_vld_tmout_func, TB_SESS_VLD, 0);
if (ci->fsm_timer->timer_list[B_SESS_VLD] == NULL)
return -ENOMEM;
return 0;
}
/* -------------------------------------------------------------*/
/* Operations that will be called from OTG Finite State Machine */
/* -------------------------------------------------------------*/
static void ci_otg_fsm_add_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
{
struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
if (t < NUM_OTG_FSM_TIMERS)
ci_otg_add_timer(ci, t);
return;
}
static void ci_otg_fsm_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
{
struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
if (t < NUM_OTG_FSM_TIMERS)
ci_otg_del_timer(ci, t);
return;
}
/*
* A-device drive vbus: turn on vbus regulator and enable port power
* Data pulse irq should be disabled while vbus is on.
*/
static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on)
{
int ret;
struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
if (on) {
/* Enable power power */
hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
PORTSC_PP);
if (ci->platdata->reg_vbus) {
ret = regulator_enable(ci->platdata->reg_vbus);
if (ret) {
dev_err(ci->dev,
"Failed to enable vbus regulator, ret=%d\n",
ret);
return;
}
}
/* Disable data pulse irq */
hw_write_otgsc(ci, OTGSC_DPIE, 0);
fsm->a_srp_det = 0;
fsm->power_up = 0;
} else {
if (ci->platdata->reg_vbus)
regulator_disable(ci->platdata->reg_vbus);
fsm->a_bus_drop = 1;
fsm->a_bus_req = 0;
}
}
/*
* Control data line by Run Stop bit.
*/
static void ci_otg_loc_conn(struct otg_fsm *fsm, int on)
{
struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
if (on)
hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
else
hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
}
/*
* Generate SOF by host.
* This is controlled through suspend/resume the port.
* In host mode, controller will automatically send SOF.
* Suspend will block the data on the port.
*/
static void ci_otg_loc_sof(struct otg_fsm *fsm, int on)
{
struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
if (on)
hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_FPR,
PORTSC_FPR);
else
hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_SUSP,
PORTSC_SUSP);
}
/*
* Start SRP pulsing by data-line pulsing,
* no v-bus pulsing followed
*/
static void ci_otg_start_pulse(struct otg_fsm *fsm)
{
struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
/* Hardware Assistant Data pulse */
hw_write_otgsc(ci, OTGSC_HADP, OTGSC_HADP);
ci_otg_add_timer(ci, B_DATA_PLS);
}
static int ci_otg_start_host(struct otg_fsm *fsm, int on)
{
struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
mutex_unlock(&fsm->lock);
if (on) {
ci_role_stop(ci);
ci_role_start(ci, CI_ROLE_HOST);
} else {
ci_role_stop(ci);
hw_device_reset(ci, USBMODE_CM_DC);
ci_role_start(ci, CI_ROLE_GADGET);
}
mutex_lock(&fsm->lock);
return 0;
}
static int ci_otg_start_gadget(struct otg_fsm *fsm, int on)
{
struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
mutex_unlock(&fsm->lock);
if (on)
usb_gadget_vbus_connect(&ci->gadget);
else
usb_gadget_vbus_disconnect(&ci->gadget);
mutex_lock(&fsm->lock);
return 0;
}
static struct otg_fsm_ops ci_otg_ops = {
.drv_vbus = ci_otg_drv_vbus,
.loc_conn = ci_otg_loc_conn,
.loc_sof = ci_otg_loc_sof,
.start_pulse = ci_otg_start_pulse,
.add_timer = ci_otg_fsm_add_timer,
.del_timer = ci_otg_fsm_del_timer,
.start_host = ci_otg_start_host,
.start_gadget = ci_otg_start_gadget,
};
int ci_otg_fsm_work(struct ci_hdrc *ci)
{
/*
* Don't do fsm transition for B device
* when there is no gadget class driver
*/
if (ci->fsm.id && !(ci->driver) &&
ci->transceiver->state < OTG_STATE_A_IDLE)
return 0;
if (otg_statemachine(&ci->fsm)) {
if (ci->transceiver->state == OTG_STATE_A_IDLE) {
/*
* Further state change for cases:
* a_idle to b_idle; or
* a_idle to a_wait_vrise due to ID change(1->0), so
* B-dev becomes A-dev can try to start new session
* consequently; or
* a_idle to a_wait_vrise when power up
*/
if ((ci->fsm.id) || (ci->id_event) ||
(ci->fsm.power_up))
ci_otg_queue_work(ci);
if (ci->id_event)
ci->id_event = false;
} else if (ci->transceiver->state == OTG_STATE_B_IDLE) {
if (ci->fsm.b_sess_vld) {
ci->fsm.power_up = 0;
/*
* Further transite to b_periphearl state
* when register gadget driver with vbus on
*/
ci_otg_queue_work(ci);
}
}
}
return 0;
}
/*
* Update fsm variables in each state if catching expected interrupts,
* called by otg fsm isr.
*/
static void ci_otg_fsm_event(struct ci_hdrc *ci)
{
u32 intr_sts, otg_bsess_vld, port_conn;
struct otg_fsm *fsm = &ci->fsm;
intr_sts = hw_read_intr_status(ci);
otg_bsess_vld = hw_read_otgsc(ci, OTGSC_BSV);
port_conn = hw_read(ci, OP_PORTSC, PORTSC_CCS);
switch (ci->transceiver->state) {
case OTG_STATE_A_WAIT_BCON:
if (port_conn) {
fsm->b_conn = 1;
fsm->a_bus_req = 1;
ci_otg_queue_work(ci);
}
break;
case OTG_STATE_B_IDLE:
if (otg_bsess_vld && (intr_sts & USBi_PCI) && port_conn) {
fsm->b_sess_vld = 1;
ci_otg_queue_work(ci);
}
break;
case OTG_STATE_B_PERIPHERAL:
if ((intr_sts & USBi_SLI) && port_conn && otg_bsess_vld) {
fsm->a_bus_suspend = 1;
ci_otg_queue_work(ci);
} else if (intr_sts & USBi_PCI) {
if (fsm->a_bus_suspend == 1)
fsm->a_bus_suspend = 0;
}
break;
case OTG_STATE_B_HOST:
if ((intr_sts & USBi_PCI) && !port_conn) {
fsm->a_conn = 0;
fsm->b_bus_req = 0;
ci_otg_queue_work(ci);
ci_otg_add_timer(ci, B_SESS_VLD);
}
break;
case OTG_STATE_A_PERIPHERAL:
if (intr_sts & USBi_SLI) {
fsm->b_bus_suspend = 1;
/*
* Init a timer to know how long this suspend
* will contine, if time out, indicates B no longer
* wants to be host role
*/
ci_otg_add_timer(ci, A_BIDL_ADIS);
}
if (intr_sts & USBi_URI)
ci_otg_del_timer(ci, A_BIDL_ADIS);
if (intr_sts & USBi_PCI) {
if (fsm->b_bus_suspend == 1) {
ci_otg_del_timer(ci, A_BIDL_ADIS);
fsm->b_bus_suspend = 0;
}
}
break;
case OTG_STATE_A_SUSPEND:
if ((intr_sts & USBi_PCI) && !port_conn) {
fsm->b_conn = 0;
/* if gadget driver is binded */
if (ci->driver) {
/* A device to be peripheral mode */
ci->gadget.is_a_peripheral = 1;
}
ci_otg_queue_work(ci);
}
break;
case OTG_STATE_A_HOST:
if ((intr_sts & USBi_PCI) && !port_conn) {
fsm->b_conn = 0;
ci_otg_queue_work(ci);
}
break;
case OTG_STATE_B_WAIT_ACON:
if ((intr_sts & USBi_PCI) && port_conn) {
fsm->a_conn = 1;
ci_otg_queue_work(ci);
}
break;
default:
break;
}
}
/*
* ci_otg_irq - otg fsm related irq handling
* and also update otg fsm variable by monitoring usb host and udc
* state change interrupts.
* @ci: ci_hdrc
*/
irqreturn_t ci_otg_fsm_irq(struct ci_hdrc *ci)
{
irqreturn_t retval = IRQ_NONE;
u32 otgsc, otg_int_src = 0;
struct otg_fsm *fsm = &ci->fsm;
otgsc = hw_read_otgsc(ci, ~0);
otg_int_src = otgsc & OTGSC_INT_STATUS_BITS & (otgsc >> 8);
fsm->id = (otgsc & OTGSC_ID) ? 1 : 0;
if (otg_int_src) {
if (otg_int_src & OTGSC_1MSIS) {
hw_write_otgsc(ci, OTGSC_1MSIS, OTGSC_1MSIS);
retval = ci_otg_tick_timer(ci);
return IRQ_HANDLED;
} else if (otg_int_src & OTGSC_DPIS) {
hw_write_otgsc(ci, OTGSC_DPIS, OTGSC_DPIS);
fsm->a_srp_det = 1;
fsm->a_bus_drop = 0;
} else if (otg_int_src & OTGSC_IDIS) {
hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
if (fsm->id == 0) {
fsm->a_bus_drop = 0;
fsm->a_bus_req = 1;
ci->id_event = true;
}
} else if (otg_int_src & OTGSC_BSVIS) {
hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
if (otgsc & OTGSC_BSV) {
fsm->b_sess_vld = 1;
ci_otg_del_timer(ci, B_SSEND_SRP);
ci_otg_del_timer(ci, B_SRP_FAIL);
fsm->b_ssend_srp = 0;
} else {
fsm->b_sess_vld = 0;
if (fsm->id)
ci_otg_add_timer(ci, B_SSEND_SRP);
}
} else if (otg_int_src & OTGSC_AVVIS) {
hw_write_otgsc(ci, OTGSC_AVVIS, OTGSC_AVVIS);
if (otgsc & OTGSC_AVV) {
fsm->a_vbus_vld = 1;
} else {
fsm->a_vbus_vld = 0;
fsm->b_conn = 0;
}
}
ci_otg_queue_work(ci);
return IRQ_HANDLED;
}
ci_otg_fsm_event(ci);
return retval;
}
void ci_hdrc_otg_fsm_start(struct ci_hdrc *ci)
{
ci_otg_queue_work(ci);
}
int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
{
int retval = 0;
struct usb_otg *otg;
otg = devm_kzalloc(ci->dev,
sizeof(struct usb_otg), GFP_KERNEL);
if (!otg) {
dev_err(ci->dev,
"Failed to allocate usb_otg structure for ci hdrc otg!\n");
return -ENOMEM;
}
otg->phy = ci->transceiver;
otg->gadget = &ci->gadget;
ci->fsm.otg = otg;
ci->transceiver->otg = ci->fsm.otg;
ci->fsm.power_up = 1;
ci->fsm.id = hw_read_otgsc(ci, OTGSC_ID) ? 1 : 0;
ci->transceiver->state = OTG_STATE_UNDEFINED;
ci->fsm.ops = &ci_otg_ops;
mutex_init(&ci->fsm.lock);
ci->fsm_timer = devm_kzalloc(ci->dev,
sizeof(struct ci_otg_fsm_timer_list), GFP_KERNEL);
if (!ci->fsm_timer) {
dev_err(ci->dev,
"Failed to allocate timer structure for ci hdrc otg!\n");
return -ENOMEM;
}
INIT_LIST_HEAD(&ci->fsm_timer->active_timers);
retval = ci_otg_init_timers(ci);
if (retval) {
dev_err(ci->dev, "Couldn't init OTG timers\n");
return retval;
}
retval = sysfs_create_group(&ci->dev->kobj, &inputs_attr_group);
if (retval < 0) {
dev_dbg(ci->dev,
"Can't register sysfs attr group: %d\n", retval);
return retval;
}
/* Enable A vbus valid irq */
hw_write_otgsc(ci, OTGSC_AVVIE, OTGSC_AVVIE);
if (ci->fsm.id) {
ci->fsm.b_ssend_srp =
hw_read_otgsc(ci, OTGSC_BSV) ? 0 : 1;
ci->fsm.b_sess_vld =
hw_read_otgsc(ci, OTGSC_BSV) ? 1 : 0;
/* Enable BSV irq */
hw_write_otgsc(ci, OTGSC_BSVIE, OTGSC_BSVIE);
}
return 0;
}
void ci_hdrc_otg_fsm_remove(struct ci_hdrc *ci)
{
sysfs_remove_group(&ci->dev->kobj, &inputs_attr_group);
}