diff options
Diffstat (limited to 'drivers/usb/chipidea/otg_fsm.c')
| -rw-r--r-- | drivers/usb/chipidea/otg_fsm.c | 844 |
1 files changed, 844 insertions, 0 deletions
diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c new file mode 100644 index 000000000..6ed4b00db --- /dev/null +++ b/drivers/usb/chipidea/otg_fsm.c @@ -0,0 +1,844 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * otg_fsm.c - ChipIdea USB IP core OTG FSM driver + * + * Copyright (C) 2014 Freescale Semiconductor, Inc. + * + * Author: Jun Li + */ + +/* + * 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" + +/* Add for otg: interact with user space app */ +static ssize_t +a_bus_req_show(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 +a_bus_req_store(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; + if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) { + ci->gadget.host_request_flag = 1; + mutex_unlock(&ci->fsm.lock); + return count; + } + } + + ci_otg_queue_work(ci); + mutex_unlock(&ci->fsm.lock); + + return count; +} +static DEVICE_ATTR_RW(a_bus_req); + +static ssize_t +a_bus_drop_show(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 +a_bus_drop_store(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_RW(a_bus_drop); + +static ssize_t +b_bus_req_show(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 +b_bus_req_store(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; + if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) { + ci->gadget.host_request_flag = 1; + mutex_unlock(&ci->fsm.lock); + return count; + } + } + + ci_otg_queue_work(ci); + mutex_unlock(&ci->fsm.lock); + + return count; +} +static DEVICE_ATTR_RW(b_bus_req); + +static ssize_t +a_clr_err_store(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_WO(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 const struct attribute_group inputs_attr_group = { + .name = "inputs", + .attrs = inputs_attrs, +}; + +/* + * Keep this list in the same order as timers indexed + * by enum otg_fsm_timer in include/linux/usb/otg-fsm.h + */ +static unsigned otg_timer_ms[] = { + TA_WAIT_VRISE, + TA_WAIT_VFALL, + TA_WAIT_BCON, + TA_AIDL_BDIS, + TB_ASE0_BRST, + TA_BIDL_ADIS, + TB_AIDL_BDIS, + TB_SE0_SRP, + TB_SRP_FAIL, + 0, + TB_DATA_PLS, + TB_SSEND_SRP, +}; + +/* + * Add timer to active timer list + */ +static void ci_otg_add_timer(struct ci_hdrc *ci, enum otg_fsm_timer t) +{ + unsigned long flags, timer_sec, timer_nsec; + + if (t >= NUM_OTG_FSM_TIMERS) + return; + + spin_lock_irqsave(&ci->lock, flags); + timer_sec = otg_timer_ms[t] / MSEC_PER_SEC; + timer_nsec = (otg_timer_ms[t] % MSEC_PER_SEC) * NSEC_PER_MSEC; + ci->hr_timeouts[t] = ktime_add(ktime_get(), + ktime_set(timer_sec, timer_nsec)); + ci->enabled_otg_timer_bits |= (1 << t); + if ((ci->next_otg_timer == NUM_OTG_FSM_TIMERS) || + ktime_after(ci->hr_timeouts[ci->next_otg_timer], + ci->hr_timeouts[t])) { + ci->next_otg_timer = t; + hrtimer_start_range_ns(&ci->otg_fsm_hrtimer, + ci->hr_timeouts[t], NSEC_PER_MSEC, + HRTIMER_MODE_ABS); + } + spin_unlock_irqrestore(&ci->lock, flags); +} + +/* + * Remove timer from active timer list + */ +static void ci_otg_del_timer(struct ci_hdrc *ci, enum otg_fsm_timer t) +{ + unsigned long flags, enabled_timer_bits; + enum otg_fsm_timer cur_timer, next_timer = NUM_OTG_FSM_TIMERS; + + if ((t >= NUM_OTG_FSM_TIMERS) || + !(ci->enabled_otg_timer_bits & (1 << t))) + return; + + spin_lock_irqsave(&ci->lock, flags); + ci->enabled_otg_timer_bits &= ~(1 << t); + if (ci->next_otg_timer == t) { + if (ci->enabled_otg_timer_bits == 0) { + /* No enabled timers after delete it */ + hrtimer_cancel(&ci->otg_fsm_hrtimer); + ci->next_otg_timer = NUM_OTG_FSM_TIMERS; + } else { + /* Find the next timer */ + enabled_timer_bits = ci->enabled_otg_timer_bits; + for_each_set_bit(cur_timer, &enabled_timer_bits, + NUM_OTG_FSM_TIMERS) { + if ((next_timer == NUM_OTG_FSM_TIMERS) || + ktime_before(ci->hr_timeouts[next_timer], + ci->hr_timeouts[cur_timer])) + next_timer = cur_timer; + } + } + } + if (next_timer != NUM_OTG_FSM_TIMERS) { + ci->next_otg_timer = next_timer; + hrtimer_start_range_ns(&ci->otg_fsm_hrtimer, + ci->hr_timeouts[next_timer], NSEC_PER_MSEC, + HRTIMER_MODE_ABS); + } + spin_unlock_irqrestore(&ci->lock, flags); +} + +/* OTG FSM timer handlers */ +static int a_wait_vrise_tmout(struct ci_hdrc *ci) +{ + ci->fsm.a_wait_vrise_tmout = 1; + return 0; +} + +static int a_wait_vfall_tmout(struct ci_hdrc *ci) +{ + ci->fsm.a_wait_vfall_tmout = 1; + return 0; +} + +static int a_wait_bcon_tmout(struct ci_hdrc *ci) +{ + ci->fsm.a_wait_bcon_tmout = 1; + return 0; +} + +static int a_aidl_bdis_tmout(struct ci_hdrc *ci) +{ + ci->fsm.a_aidl_bdis_tmout = 1; + return 0; +} + +static int b_ase0_brst_tmout(struct ci_hdrc *ci) +{ + ci->fsm.b_ase0_brst_tmout = 1; + return 0; +} + +static int a_bidl_adis_tmout(struct ci_hdrc *ci) +{ + ci->fsm.a_bidl_adis_tmout = 1; + return 0; +} + +static int b_aidl_bdis_tmout(struct ci_hdrc *ci) +{ + ci->fsm.a_bus_suspend = 1; + return 0; +} + +static int b_se0_srp_tmout(struct ci_hdrc *ci) +{ + ci->fsm.b_se0_srp = 1; + return 0; +} + +static int b_srp_fail_tmout(struct ci_hdrc *ci) +{ + ci->fsm.b_srp_done = 1; + return 1; +} + +static int b_data_pls_tmout(struct ci_hdrc *ci) +{ + 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); + pm_runtime_put(ci->dev); + return 0; +} + +static int b_ssend_srp_tmout(struct ci_hdrc *ci) +{ + ci->fsm.b_ssend_srp = 1; + /* only vbus fall below B_sess_vld in b_idle state */ + if (ci->fsm.otg->state == OTG_STATE_B_IDLE) + return 0; + else + return 1; +} + +/* + * Keep this list in the same order as timers indexed + * by enum otg_fsm_timer in include/linux/usb/otg-fsm.h + */ +static int (*otg_timer_handlers[])(struct ci_hdrc *) = { + a_wait_vrise_tmout, /* A_WAIT_VRISE */ + a_wait_vfall_tmout, /* A_WAIT_VFALL */ + a_wait_bcon_tmout, /* A_WAIT_BCON */ + a_aidl_bdis_tmout, /* A_AIDL_BDIS */ + b_ase0_brst_tmout, /* B_ASE0_BRST */ + a_bidl_adis_tmout, /* A_BIDL_ADIS */ + b_aidl_bdis_tmout, /* B_AIDL_BDIS */ + b_se0_srp_tmout, /* B_SE0_SRP */ + b_srp_fail_tmout, /* B_SRP_FAIL */ + NULL, /* A_WAIT_ENUM */ + b_data_pls_tmout, /* B_DATA_PLS */ + b_ssend_srp_tmout, /* B_SSEND_SRP */ +}; + +/* + * Enable the next nearest enabled timer if have + */ +static enum hrtimer_restart ci_otg_hrtimer_func(struct hrtimer *t) +{ + struct ci_hdrc *ci = container_of(t, struct ci_hdrc, otg_fsm_hrtimer); + ktime_t now, *timeout; + unsigned long enabled_timer_bits; + unsigned long flags; + enum otg_fsm_timer cur_timer, next_timer = NUM_OTG_FSM_TIMERS; + int ret = -EINVAL; + + spin_lock_irqsave(&ci->lock, flags); + enabled_timer_bits = ci->enabled_otg_timer_bits; + ci->next_otg_timer = NUM_OTG_FSM_TIMERS; + + now = ktime_get(); + for_each_set_bit(cur_timer, &enabled_timer_bits, NUM_OTG_FSM_TIMERS) { + if (ktime_compare(now, ci->hr_timeouts[cur_timer]) >= 0) { + ci->enabled_otg_timer_bits &= ~(1 << cur_timer); + if (otg_timer_handlers[cur_timer]) + ret = otg_timer_handlers[cur_timer](ci); + } else { + if ((next_timer == NUM_OTG_FSM_TIMERS) || + ktime_before(ci->hr_timeouts[cur_timer], + ci->hr_timeouts[next_timer])) + next_timer = cur_timer; + } + } + /* Enable the next nearest timer */ + if (next_timer < NUM_OTG_FSM_TIMERS) { + timeout = &ci->hr_timeouts[next_timer]; + hrtimer_start_range_ns(&ci->otg_fsm_hrtimer, *timeout, + NSEC_PER_MSEC, HRTIMER_MODE_ABS); + ci->next_otg_timer = next_timer; + } + spin_unlock_irqrestore(&ci->lock, flags); + + if (!ret) + ci_otg_queue_work(ci); + + return HRTIMER_NORESTART; +} + +/* Initialize timers */ +static int ci_otg_init_timers(struct ci_hdrc *ci) +{ + hrtimer_init(&ci->otg_fsm_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); + ci->otg_fsm_hrtimer.function = ci_otg_hrtimer_func; + + 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. + * 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); +} |