On Thu, Apr 10, 2014 at 07:36:08PM +0800, Li Jun wrote:
> From: Li Jun <[email protected]>
>
> USB OTG interrupt handling and fsm transitions according to USB OTG
> and EH 2.0.
>
> Signed-off-by: Li Jun <[email protected]>
> ---
> drivers/usb/chipidea/core.c | 23 ++--
> drivers/usb/chipidea/otg.c | 9 +-
> drivers/usb/chipidea/otg_fsm.c | 232
> ++++++++++++++++++++++++++++++++++++++++
> drivers/usb/chipidea/otg_fsm.h | 18 ++++
> drivers/usb/chipidea/udc.c | 9 ++
> 5 files changed, 283 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> index ff38cf3..9a01e14 100644
> --- a/drivers/usb/chipidea/core.c
> +++ b/drivers/usb/chipidea/core.c
> @@ -42,7 +42,6 @@
> * - Not Supported: 15 & 16 (ISO)
> *
> * TODO List
> - * - OTG
> * - Interrupt Traffic
> * - GET_STATUS(device) - always reports 0
> * - Gadget API (majority of optional features)
> @@ -74,6 +73,7 @@
> #include "host.h"
> #include "debug.h"
> #include "otg.h"
> +#include "otg_fsm.h"
>
> /* Controller register map */
> static const u8 ci_regs_nolpm[] = {
> @@ -412,8 +412,14 @@ static irqreturn_t ci_irq(int irq, void *data)
> irqreturn_t ret = IRQ_NONE;
> u32 otgsc = 0;
>
> - if (ci->is_otg)
> + if (ci->is_otg) {
> otgsc = hw_read_otgsc(ci, ~0);
> + if (ci_otg_is_fsm_mode(ci)) {
> + ret = ci_otg_fsm_irq(ci);
> + if (ret == IRQ_HANDLED)
> + return ret;
> + }
> + }
>
> /*
> * Handle id change interrupt, it indicates device/host function
> @@ -691,10 +697,15 @@ static int ci_hdrc_probe(struct platform_device *pdev)
> if (ci->role == CI_ROLE_GADGET)
> ci_handle_vbus_change(ci);
>
> - ret = ci_role_start(ci, ci->role);
> - if (ret) {
> - dev_err(dev, "can't start %s role\n", ci_role(ci)->name);
> - goto stop;
> + if (ci_otg_is_fsm_mode(ci)) {
> + ci_hdrc_otg_fsm_start(ci);
> + } else {
> + ret = ci_role_start(ci, ci->role);
> + if (ret) {
> + dev_err(dev, "can't start %s role\n",
> + ci_role(ci)->name);
> + goto stop;
> + }
> }
>
> platform_set_drvdata(pdev, ci);
> diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c
> index d76db51..38e340c 100644
> --- a/drivers/usb/chipidea/otg.c
> +++ b/drivers/usb/chipidea/otg.c
> @@ -11,8 +11,8 @@
> */
>
> /*
> - * This file mainly handles otgsc register, it may include OTG operation
> - * in the future.
> + * This file mainly handles otgsc register, OTG fsm operations for HNP and
> SRP
> + * are also included.
> */
>
> #include <linux/usb/otg.h>
> @@ -91,6 +91,11 @@ 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;
> + }
> +
> if (ci->id_event) {
> ci->id_event = false;
> ci_handle_id_switch(ci);
> diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
> index bb64fb4..3542205 100644
> --- a/drivers/usb/chipidea/otg_fsm.c
> +++ b/drivers/usb/chipidea/otg_fsm.c
> @@ -13,6 +13,10 @@
> /*
> * 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>
> @@ -93,6 +97,33 @@ static void ci_otg_del_timer(struct ci_hdrc *ci, enum
> ci_otg_fsm_timer_index t)
> 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)
> {
> @@ -394,6 +425,207 @@ static struct otg_fsm_ops ci_otg_ops = {
> .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, or
> + * A idle to A wait vrise when power up
> + */
> + if ((ci->fsm.id) || (ci->id_event) ||
> + (ci->fsm.power_up)) {
> + disable_irq_nosync(ci->irq);
> + queue_work(ci->wq, &ci->work);
> + }
> + if (ci->id_event)
> + ci->id_event = false;
> + }
> + }
> + 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;
> + disable_irq_nosync(ci->irq);
> + queue_work(ci->wq, &ci->work);
> + }
> + break;
> + case OTG_STATE_B_IDLE:
> + if (otg_bsess_vld && (intr_sts & USBi_PCI) && port_conn) {
> + fsm->b_sess_vld = 1;
> + disable_irq_nosync(ci->irq);
> + queue_work(ci->wq, &ci->work);
> + }
> + if (fsm->b_sess_vld)
> + fsm->power_up = 0;
> + break;
> + case OTG_STATE_B_PERIPHERAL:
> + if ((intr_sts & USBi_SLI) && port_conn && otg_bsess_vld) {
> + fsm->a_bus_suspend = 1;
> + disable_irq_nosync(ci->irq);
> + queue_work(ci->wq, &ci->work);
> + } 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;
> + disable_irq_nosync(ci->irq);
> + queue_work(ci->wq, &ci->work);
> + 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;
> + }
> + disable_irq_nosync(ci->irq);
> + queue_work(ci->wq, &ci->work);
> + }
> + break;
> + case OTG_STATE_A_HOST:
> + if ((intr_sts & USBi_PCI) && !port_conn) {
> + fsm->b_conn = 0;
> + disable_irq_nosync(ci->irq);
> + queue_work(ci->wq, &ci->work);
> + }
> + break;
> + case OTG_STATE_B_WAIT_ACON:
> + if ((intr_sts & USBi_PCI) && port_conn) {
> + fsm->a_conn = 1;
> + disable_irq_nosync(ci->irq);
> + queue_work(ci->wq, &ci->work);
> + }
> + 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;
> + }
> + }
> + disable_irq_nosync(ci->irq);
> + queue_work(ci->wq, &ci->work);
> + return IRQ_HANDLED;
> + }
> +
> + ci_otg_fsm_event(ci);
> +
> + return retval;
> +}
> +
> +void ci_hdrc_otg_fsm_start(struct ci_hdrc *ci)
> +{
> + ci_otg_fsm_work(ci);
> +}
> +
> int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
> {
> int retval = 0;
> diff --git a/drivers/usb/chipidea/otg_fsm.h b/drivers/usb/chipidea/otg_fsm.h
> index 420f081..6ec8247 100644
> --- a/drivers/usb/chipidea/otg_fsm.h
> +++ b/drivers/usb/chipidea/otg_fsm.h
> @@ -92,6 +92,9 @@ struct ci_otg_fsm_timer_list {
> #ifdef CONFIG_USB_OTG_FSM
>
> int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci);
> +int ci_otg_fsm_work(struct ci_hdrc *ci);
> +irqreturn_t ci_otg_fsm_irq(struct ci_hdrc *ci);
> +void ci_hdrc_otg_fsm_start(struct ci_hdrc *ci);
>
> #else
>
> @@ -100,6 +103,21 @@ static inline int ci_hdrc_otg_fsm_init(struct ci_hdrc
> *ci)
> return 0;
> }
>
> +static inline int ci_otg_fsm_work(struct ci_hdrc *ci)
> +{
> + return -ENXIO;
> +}
> +
> +static inline irqreturn_t ci_otg_fsm_irq(struct ci_hdrc *ci)
> +{
> + return IRQ_NONE;
> +}
> +
> +static inline void ci_hdrc_otg_fsm_start(struct ci_hdrc *ci)
> +{
> +
> +}
> +
> #endif
>
> #endif /* __DRIVERS_USB_CHIPIDEA_OTG_FSM_H */
> diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
> index cba7fd6..362d8f1 100644
> --- a/drivers/usb/chipidea/udc.c
> +++ b/drivers/usb/chipidea/udc.c
> @@ -28,6 +28,7 @@
> #include "bits.h"
> #include "debug.h"
> #include "otg.h"
> +#include "otg_fsm.h"
>
> /* control endpoint description */
> static const struct usb_endpoint_descriptor
> @@ -1644,7 +1645,15 @@ static int ci_udc_start(struct usb_gadget *gadget,
> return retval;
>
> ci->driver = driver;
> +
> + /* Start otg fsm for B-device */
> + if (ci_otg_is_fsm_mode(ci) && ci->fsm.id) {
> + ci_hdrc_otg_fsm_start(ci);
> + return retval;
> + }
> +
We may need to call pm_runtime_get(set)_sync for otg fsm
too since the controller is in low power mode at this time
if runtime pm is supported.
> pm_runtime_get_sync(&ci->gadget.dev);
> +
blank line
> if (ci->vbus_active) {
> spin_lock_irqsave(&ci->lock, flags);
> hw_device_reset(ci, USBMODE_CM_DC);
> --
> 1.7.9.5
>
>
--
Best Regards,
Peter Chen
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