mirror of https://gitee.com/openkylin/linux.git
845 lines
19 KiB
C
845 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* otg_fsm.c - ChipIdea USB IP core OTG FSM driver
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*
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* Copyright (C) 2014 Freescale Semiconductor, Inc.
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*
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* Author: Jun Li
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*/
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/*
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* This file mainly handles OTG fsm, it includes OTG fsm operations
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* for HNP and SRP.
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*
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* TODO List
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* - ADP
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* - OTG test device
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*/
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#include <linux/usb/otg.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/hcd.h>
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#include <linux/usb/chipidea.h>
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#include <linux/regulator/consumer.h>
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#include "ci.h"
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#include "bits.h"
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#include "otg.h"
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#include "otg_fsm.h"
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/* Add for otg: interact with user space app */
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static ssize_t
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a_bus_req_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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char *next;
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unsigned size, t;
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struct ci_hdrc *ci = dev_get_drvdata(dev);
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next = buf;
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size = PAGE_SIZE;
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t = scnprintf(next, size, "%d\n", ci->fsm.a_bus_req);
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size -= t;
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next += t;
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return PAGE_SIZE - size;
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}
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static ssize_t
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a_bus_req_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ci_hdrc *ci = dev_get_drvdata(dev);
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if (count > 2)
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return -1;
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mutex_lock(&ci->fsm.lock);
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if (buf[0] == '0') {
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ci->fsm.a_bus_req = 0;
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} else if (buf[0] == '1') {
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/* If a_bus_drop is TRUE, a_bus_req can't be set */
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if (ci->fsm.a_bus_drop) {
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mutex_unlock(&ci->fsm.lock);
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return count;
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}
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ci->fsm.a_bus_req = 1;
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if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
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ci->gadget.host_request_flag = 1;
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mutex_unlock(&ci->fsm.lock);
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return count;
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}
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}
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ci_otg_queue_work(ci);
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mutex_unlock(&ci->fsm.lock);
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return count;
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}
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static DEVICE_ATTR_RW(a_bus_req);
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static ssize_t
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a_bus_drop_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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char *next;
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unsigned size, t;
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struct ci_hdrc *ci = dev_get_drvdata(dev);
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next = buf;
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size = PAGE_SIZE;
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t = scnprintf(next, size, "%d\n", ci->fsm.a_bus_drop);
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size -= t;
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next += t;
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return PAGE_SIZE - size;
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}
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static ssize_t
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a_bus_drop_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ci_hdrc *ci = dev_get_drvdata(dev);
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if (count > 2)
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return -1;
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mutex_lock(&ci->fsm.lock);
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if (buf[0] == '0') {
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ci->fsm.a_bus_drop = 0;
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} else if (buf[0] == '1') {
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ci->fsm.a_bus_drop = 1;
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ci->fsm.a_bus_req = 0;
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}
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ci_otg_queue_work(ci);
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mutex_unlock(&ci->fsm.lock);
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return count;
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}
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static DEVICE_ATTR_RW(a_bus_drop);
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static ssize_t
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b_bus_req_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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char *next;
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unsigned size, t;
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struct ci_hdrc *ci = dev_get_drvdata(dev);
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next = buf;
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size = PAGE_SIZE;
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t = scnprintf(next, size, "%d\n", ci->fsm.b_bus_req);
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size -= t;
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next += t;
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return PAGE_SIZE - size;
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}
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static ssize_t
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b_bus_req_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ci_hdrc *ci = dev_get_drvdata(dev);
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if (count > 2)
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return -1;
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mutex_lock(&ci->fsm.lock);
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if (buf[0] == '0')
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ci->fsm.b_bus_req = 0;
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else if (buf[0] == '1') {
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ci->fsm.b_bus_req = 1;
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if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
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ci->gadget.host_request_flag = 1;
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mutex_unlock(&ci->fsm.lock);
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return count;
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}
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}
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ci_otg_queue_work(ci);
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mutex_unlock(&ci->fsm.lock);
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return count;
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}
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static DEVICE_ATTR_RW(b_bus_req);
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static ssize_t
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a_clr_err_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct ci_hdrc *ci = dev_get_drvdata(dev);
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if (count > 2)
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return -1;
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mutex_lock(&ci->fsm.lock);
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if (buf[0] == '1')
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ci->fsm.a_clr_err = 1;
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ci_otg_queue_work(ci);
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mutex_unlock(&ci->fsm.lock);
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return count;
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}
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static DEVICE_ATTR_WO(a_clr_err);
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static struct attribute *inputs_attrs[] = {
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&dev_attr_a_bus_req.attr,
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&dev_attr_a_bus_drop.attr,
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&dev_attr_b_bus_req.attr,
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&dev_attr_a_clr_err.attr,
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NULL,
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};
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static const struct attribute_group inputs_attr_group = {
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.name = "inputs",
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.attrs = inputs_attrs,
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};
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/*
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* Keep this list in the same order as timers indexed
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* by enum otg_fsm_timer in include/linux/usb/otg-fsm.h
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*/
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static unsigned otg_timer_ms[] = {
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TA_WAIT_VRISE,
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TA_WAIT_VFALL,
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TA_WAIT_BCON,
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TA_AIDL_BDIS,
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TB_ASE0_BRST,
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TA_BIDL_ADIS,
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TB_AIDL_BDIS,
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TB_SE0_SRP,
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TB_SRP_FAIL,
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0,
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TB_DATA_PLS,
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TB_SSEND_SRP,
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};
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/*
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* Add timer to active timer list
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*/
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static void ci_otg_add_timer(struct ci_hdrc *ci, enum otg_fsm_timer t)
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{
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unsigned long flags, timer_sec, timer_nsec;
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if (t >= NUM_OTG_FSM_TIMERS)
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return;
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spin_lock_irqsave(&ci->lock, flags);
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timer_sec = otg_timer_ms[t] / MSEC_PER_SEC;
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timer_nsec = (otg_timer_ms[t] % MSEC_PER_SEC) * NSEC_PER_MSEC;
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ci->hr_timeouts[t] = ktime_add(ktime_get(),
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ktime_set(timer_sec, timer_nsec));
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ci->enabled_otg_timer_bits |= (1 << t);
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if ((ci->next_otg_timer == NUM_OTG_FSM_TIMERS) ||
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ktime_after(ci->hr_timeouts[ci->next_otg_timer],
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ci->hr_timeouts[t])) {
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ci->next_otg_timer = t;
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hrtimer_start_range_ns(&ci->otg_fsm_hrtimer,
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ci->hr_timeouts[t], NSEC_PER_MSEC,
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HRTIMER_MODE_ABS);
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}
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spin_unlock_irqrestore(&ci->lock, flags);
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}
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/*
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* Remove timer from active timer list
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*/
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static void ci_otg_del_timer(struct ci_hdrc *ci, enum otg_fsm_timer t)
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{
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unsigned long flags, enabled_timer_bits;
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enum otg_fsm_timer cur_timer, next_timer = NUM_OTG_FSM_TIMERS;
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if ((t >= NUM_OTG_FSM_TIMERS) ||
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!(ci->enabled_otg_timer_bits & (1 << t)))
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return;
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spin_lock_irqsave(&ci->lock, flags);
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ci->enabled_otg_timer_bits &= ~(1 << t);
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if (ci->next_otg_timer == t) {
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if (ci->enabled_otg_timer_bits == 0) {
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/* No enabled timers after delete it */
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hrtimer_cancel(&ci->otg_fsm_hrtimer);
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ci->next_otg_timer = NUM_OTG_FSM_TIMERS;
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} else {
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/* Find the next timer */
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enabled_timer_bits = ci->enabled_otg_timer_bits;
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for_each_set_bit(cur_timer, &enabled_timer_bits,
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NUM_OTG_FSM_TIMERS) {
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if ((next_timer == NUM_OTG_FSM_TIMERS) ||
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ktime_before(ci->hr_timeouts[next_timer],
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ci->hr_timeouts[cur_timer]))
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next_timer = cur_timer;
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}
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}
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}
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if (next_timer != NUM_OTG_FSM_TIMERS) {
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ci->next_otg_timer = next_timer;
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hrtimer_start_range_ns(&ci->otg_fsm_hrtimer,
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ci->hr_timeouts[next_timer], NSEC_PER_MSEC,
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HRTIMER_MODE_ABS);
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}
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spin_unlock_irqrestore(&ci->lock, flags);
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}
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/* OTG FSM timer handlers */
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static int a_wait_vrise_tmout(struct ci_hdrc *ci)
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{
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ci->fsm.a_wait_vrise_tmout = 1;
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return 0;
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}
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static int a_wait_vfall_tmout(struct ci_hdrc *ci)
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{
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ci->fsm.a_wait_vfall_tmout = 1;
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return 0;
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}
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static int a_wait_bcon_tmout(struct ci_hdrc *ci)
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{
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ci->fsm.a_wait_bcon_tmout = 1;
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return 0;
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}
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static int a_aidl_bdis_tmout(struct ci_hdrc *ci)
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{
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ci->fsm.a_aidl_bdis_tmout = 1;
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return 0;
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}
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static int b_ase0_brst_tmout(struct ci_hdrc *ci)
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{
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ci->fsm.b_ase0_brst_tmout = 1;
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return 0;
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}
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static int a_bidl_adis_tmout(struct ci_hdrc *ci)
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{
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ci->fsm.a_bidl_adis_tmout = 1;
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return 0;
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}
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static int b_aidl_bdis_tmout(struct ci_hdrc *ci)
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{
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ci->fsm.a_bus_suspend = 1;
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return 0;
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}
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static int b_se0_srp_tmout(struct ci_hdrc *ci)
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{
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ci->fsm.b_se0_srp = 1;
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return 0;
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}
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static int b_srp_fail_tmout(struct ci_hdrc *ci)
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{
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ci->fsm.b_srp_done = 1;
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return 1;
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}
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static int b_data_pls_tmout(struct ci_hdrc *ci)
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{
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ci->fsm.b_srp_done = 1;
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ci->fsm.b_bus_req = 0;
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if (ci->fsm.power_up)
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ci->fsm.power_up = 0;
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hw_write_otgsc(ci, OTGSC_HABA, 0);
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pm_runtime_put(ci->dev);
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return 0;
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}
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static int b_ssend_srp_tmout(struct ci_hdrc *ci)
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{
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ci->fsm.b_ssend_srp = 1;
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/* only vbus fall below B_sess_vld in b_idle state */
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if (ci->fsm.otg->state == OTG_STATE_B_IDLE)
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return 0;
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else
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return 1;
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}
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/*
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* Keep this list in the same order as timers indexed
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* by enum otg_fsm_timer in include/linux/usb/otg-fsm.h
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*/
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static int (*otg_timer_handlers[])(struct ci_hdrc *) = {
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a_wait_vrise_tmout, /* A_WAIT_VRISE */
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a_wait_vfall_tmout, /* A_WAIT_VFALL */
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a_wait_bcon_tmout, /* A_WAIT_BCON */
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a_aidl_bdis_tmout, /* A_AIDL_BDIS */
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b_ase0_brst_tmout, /* B_ASE0_BRST */
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a_bidl_adis_tmout, /* A_BIDL_ADIS */
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b_aidl_bdis_tmout, /* B_AIDL_BDIS */
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b_se0_srp_tmout, /* B_SE0_SRP */
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b_srp_fail_tmout, /* B_SRP_FAIL */
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NULL, /* A_WAIT_ENUM */
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b_data_pls_tmout, /* B_DATA_PLS */
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b_ssend_srp_tmout, /* B_SSEND_SRP */
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};
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/*
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* Enable the next nearest enabled timer if have
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*/
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static enum hrtimer_restart ci_otg_hrtimer_func(struct hrtimer *t)
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{
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struct ci_hdrc *ci = container_of(t, struct ci_hdrc, otg_fsm_hrtimer);
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ktime_t now, *timeout;
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unsigned long enabled_timer_bits;
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unsigned long flags;
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enum otg_fsm_timer cur_timer, next_timer = NUM_OTG_FSM_TIMERS;
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int ret = -EINVAL;
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spin_lock_irqsave(&ci->lock, flags);
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enabled_timer_bits = ci->enabled_otg_timer_bits;
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ci->next_otg_timer = NUM_OTG_FSM_TIMERS;
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now = ktime_get();
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for_each_set_bit(cur_timer, &enabled_timer_bits, NUM_OTG_FSM_TIMERS) {
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if (ktime_compare(now, ci->hr_timeouts[cur_timer]) >= 0) {
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ci->enabled_otg_timer_bits &= ~(1 << cur_timer);
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if (otg_timer_handlers[cur_timer])
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ret = otg_timer_handlers[cur_timer](ci);
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} else {
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if ((next_timer == NUM_OTG_FSM_TIMERS) ||
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ktime_before(ci->hr_timeouts[cur_timer],
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ci->hr_timeouts[next_timer]))
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next_timer = cur_timer;
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}
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}
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/* Enable the next nearest timer */
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if (next_timer < NUM_OTG_FSM_TIMERS) {
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timeout = &ci->hr_timeouts[next_timer];
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hrtimer_start_range_ns(&ci->otg_fsm_hrtimer, *timeout,
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NSEC_PER_MSEC, HRTIMER_MODE_ABS);
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ci->next_otg_timer = next_timer;
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}
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spin_unlock_irqrestore(&ci->lock, flags);
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if (!ret)
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ci_otg_queue_work(ci);
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return HRTIMER_NORESTART;
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}
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/* Initialize timers */
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static int ci_otg_init_timers(struct ci_hdrc *ci)
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{
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hrtimer_init(&ci->otg_fsm_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
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ci->otg_fsm_hrtimer.function = ci_otg_hrtimer_func;
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return 0;
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}
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/* -------------------------------------------------------------*/
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/* Operations that will be called from OTG Finite State Machine */
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/* -------------------------------------------------------------*/
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static void ci_otg_fsm_add_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
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{
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struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
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if (t < NUM_OTG_FSM_TIMERS)
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ci_otg_add_timer(ci, t);
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return;
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}
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static void ci_otg_fsm_del_timer(struct otg_fsm *fsm, enum otg_fsm_timer t)
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{
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struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
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if (t < NUM_OTG_FSM_TIMERS)
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ci_otg_del_timer(ci, t);
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return;
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}
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/*
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* A-device drive vbus: turn on vbus regulator and enable port power
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* Data pulse irq should be disabled while vbus is on.
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*/
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static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on)
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{
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int ret;
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struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
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if (on) {
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/* Enable power power */
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hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS | PORTSC_PP,
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PORTSC_PP);
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if (ci->platdata->reg_vbus) {
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ret = regulator_enable(ci->platdata->reg_vbus);
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if (ret) {
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dev_err(ci->dev,
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"Failed to enable vbus regulator, ret=%d\n",
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ret);
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return;
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}
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}
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/* Disable data pulse irq */
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hw_write_otgsc(ci, OTGSC_DPIE, 0);
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fsm->a_srp_det = 0;
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fsm->power_up = 0;
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} else {
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if (ci->platdata->reg_vbus)
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regulator_disable(ci->platdata->reg_vbus);
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fsm->a_bus_drop = 1;
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fsm->a_bus_req = 0;
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}
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}
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/*
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* Control data line by Run Stop bit.
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*/
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static void ci_otg_loc_conn(struct otg_fsm *fsm, int on)
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{
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struct ci_hdrc *ci = container_of(fsm, struct ci_hdrc, fsm);
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if (on)
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hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
|
|
else
|
|
hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
|
|
}
|
|
|
|
/*
|
|
* Generate SOF by host.
|
|
* In host mode, controller will automatically send SOF.
|
|
* Suspend will block the data on the port.
|
|
*
|
|
* This is controlled through usbcore by usb autosuspend,
|
|
* so the usb device class driver need support autosuspend,
|
|
* otherwise the bus suspend will not happen.
|
|
*/
|
|
static void ci_otg_loc_sof(struct otg_fsm *fsm, int on)
|
|
{
|
|
struct usb_device *udev;
|
|
|
|
if (!fsm->otg->host)
|
|
return;
|
|
|
|
udev = usb_hub_find_child(fsm->otg->host->root_hub, 1);
|
|
if (!udev)
|
|
return;
|
|
|
|
if (on) {
|
|
usb_disable_autosuspend(udev);
|
|
} else {
|
|
pm_runtime_set_autosuspend_delay(&udev->dev, 0);
|
|
usb_enable_autosuspend(udev);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
pm_runtime_get(ci->dev);
|
|
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);
|
|
|
|
if (on) {
|
|
ci_role_stop(ci);
|
|
ci_role_start(ci, CI_ROLE_HOST);
|
|
} else {
|
|
ci_role_stop(ci);
|
|
ci_role_start(ci, CI_ROLE_GADGET);
|
|
}
|
|
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);
|
|
|
|
if (on)
|
|
usb_gadget_vbus_connect(&ci->gadget);
|
|
else
|
|
usb_gadget_vbus_disconnect(&ci->gadget);
|
|
|
|
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->fsm.otg->state < OTG_STATE_A_IDLE)
|
|
return 0;
|
|
|
|
pm_runtime_get_sync(ci->dev);
|
|
if (otg_statemachine(&ci->fsm)) {
|
|
if (ci->fsm.otg->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);
|
|
} else {
|
|
/* Enable data pulse irq */
|
|
hw_write(ci, OP_PORTSC, PORTSC_W1C_BITS |
|
|
PORTSC_PP, 0);
|
|
hw_write_otgsc(ci, OTGSC_DPIS, OTGSC_DPIS);
|
|
hw_write_otgsc(ci, OTGSC_DPIE, OTGSC_DPIE);
|
|
}
|
|
if (ci->id_event)
|
|
ci->id_event = false;
|
|
} else if (ci->fsm.otg->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);
|
|
}
|
|
} else if (ci->fsm.otg->state == OTG_STATE_A_HOST) {
|
|
pm_runtime_mark_last_busy(ci->dev);
|
|
pm_runtime_put_autosuspend(ci->dev);
|
|
return 0;
|
|
}
|
|
}
|
|
pm_runtime_put_sync(ci->dev);
|
|
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->fsm.otg->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) {
|
|
ci_otg_add_timer(ci, B_AIDL_BDIS);
|
|
} else if (intr_sts & USBi_PCI) {
|
|
ci_otg_del_timer(ci, B_AIDL_BDIS);
|
|
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);
|
|
}
|
|
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 continue, 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_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;
|
|
|
|
if (ci->phy)
|
|
ci->otg.phy = ci->phy;
|
|
else
|
|
ci->otg.usb_phy = ci->usb_phy;
|
|
|
|
ci->otg.gadget = &ci->gadget;
|
|
ci->fsm.otg = &ci->otg;
|
|
ci->fsm.power_up = 1;
|
|
ci->fsm.id = hw_read_otgsc(ci, OTGSC_ID) ? 1 : 0;
|
|
ci->fsm.otg->state = OTG_STATE_UNDEFINED;
|
|
ci->fsm.ops = &ci_otg_ops;
|
|
ci->gadget.hnp_polling_support = 1;
|
|
ci->fsm.host_req_flag = devm_kzalloc(ci->dev, 1, GFP_KERNEL);
|
|
if (!ci->fsm.host_req_flag)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&ci->fsm.lock);
|
|
|
|
retval = ci_otg_init_timers(ci);
|
|
if (retval) {
|
|
dev_err(ci->dev, "Couldn't init OTG timers\n");
|
|
return retval;
|
|
}
|
|
ci->enabled_otg_timer_bits = 0;
|
|
ci->next_otg_timer = NUM_OTG_FSM_TIMERS;
|
|
|
|
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);
|
|
}
|