USB OTG interrupt handling and fsm transition according to USB OTG
spec 2.0, update otg timer timeout handlers.
Signed-off-by: Li Jun <b47624@xxxxxxxxxxxxx>
---
drivers/usb/chipidea/bits.h | 2 +
drivers/usb/chipidea/core.c | 10 ++-
drivers/usb/chipidea/otg.c | 9 ++-
drivers/usb/chipidea/otg_fsm.c | 193 ++++++++++++++++++++++++++++++++++++++++
drivers/usb/chipidea/otg_fsm.h | 18 ++++
5 files changed, 229 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
index 88136d1..5a74f9d 100644
--- a/drivers/usb/chipidea/bits.h
+++ b/drivers/usb/chipidea/bits.h
@@ -33,6 +33,8 @@
#define USBCMD_ATDTW BIT(14)
/* USBSTS & USBINTR */
+#define USBSTS_PCI BIT(2)
+#define USBSTS_SLI BIT(8)
#define USBi_UI BIT(0)
#define USBi_UEI BIT(1)
#define USBi_PCI BIT(2)
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 33f22bc..6865451 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -73,6 +73,7 @@
#include "host.h"
#include "debug.h"
#include "otg.h"
+#include "otg_fsm.h"
/* Controller register map */
static const u8 ci_regs_nolpm[] = {
@@ -351,8 +352,12 @@ 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(ci, OP_OTGSC, ~0);
+ ret = ci_otg_fsm_irq(ci);
+ if (ret == IRQ_HANDLED)
+ return ret;
+ }
/*
* Handle id change interrupt, it indicates device/host function
@@ -656,6 +661,9 @@ static int ci_hdrc_probe(struct platform_device *pdev)
if (ret)
goto stop;
+ if (ci->is_otg)
+ ci_hdrc_otg_fsm_start(ci);
+
ret = dbg_create_files(ci);
if (!ret)
return 0;
diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c
index cbf0167..4fb33a2 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>
@@ -77,6 +77,11 @@ static void ci_otg_work(struct work_struct *work)
{
struct ci_hdrc *ci = container_of(work, struct ci_hdrc, work);
+ if (!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 5416fe3..e713b76 100644
--- a/drivers/usb/chipidea/otg_fsm.c
+++ b/drivers/usb/chipidea/otg_fsm.c
@@ -433,6 +433,199 @@ static struct otg_fsm_ops ci_otg_ops = {
.start_gadget = ci_otg_start_gadget,
};
+int ci_otg_fsm_work(struct ci_hdrc *ci)
+{
+ if (!ci->transceiver->otg || !ci->fsm)
+ return -ENODEV;
+
+ if (otg_statemachine(ci->fsm)) {
+ if (ci->transceiver->state == OTG_STATE_A_IDLE) {
+ if (ci->fsm->id)
+ /* A idle to B idle */
+ otg_statemachine(ci->fsm);
+ else if ((ci->id_event) || (ci->fsm->power_up)) {
+ ci->id_event = false;
+ /* A idle to A wait vrise */
+ otg_statemachine(ci->fsm);
+ ci->fsm->power_up = false;
+ }
+ }
+ }
+ return 0;
+}
+
+static void ci_otg_fsm_event(struct ci_hdrc *ci, struct otg_fsm *fsm)
+{
+ if ((ci == NULL) || (fsm == NULL))
+ return;
+
+ switch (ci->transceiver->state) {
+ case OTG_STATE_A_WAIT_BCON:
+ if (hw_read(ci, OP_PORTSC, PORTSC_CCS)) {
+ 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 (hw_read(ci, OP_OTGSC, OTGSC_BSV) &&
+ hw_read(ci, OP_USBSTS, USBSTS_PCI) &&
+ hw_read(ci, OP_PORTSC, PORTSC_CCS)) {
+ fsm->b_sess_vld = 1;
+ disable_irq_nosync(ci->irq);
+ queue_work(ci->wq, &ci->work);
+ }
+ break;
+ case OTG_STATE_B_PERIPHERAL:
+ if (hw_read(ci, OP_USBSTS, USBSTS_SLI) &&
+ hw_read(ci, OP_PORTSC, PORTSC_CCS) &&
+ hw_read(ci, OP_OTGSC, OTGSC_BSV)) {
+ fsm->a_bus_suspend = 1;
+ disable_irq_nosync(ci->irq);
+ queue_work(ci->wq, &ci->work);
+ } else if (hw_read(ci, OP_USBSTS, USBSTS_PCI)) {
+ if (fsm->a_bus_suspend == 1)
+ fsm->a_bus_suspend = 0;
+ }
+ break;
+ case OTG_STATE_B_HOST:
+ if (hw_read(ci, OP_USBSTS, USBSTS_PCI) &&
+ !(hw_read(ci, OP_PORTSC, PORTSC_CCS))) {
+ 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 (hw_read(ci, OP_USBSTS, USBSTS_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 (hw_read(ci, OP_USBSTS, USBi_URI))
+ ci_otg_del_timer(ci, A_BIDL_ADIS);
+
+ if (hw_read(ci, OP_USBSTS, USBSTS_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 (hw_read(ci, OP_USBSTS, USBSTS_PCI) &&
+ !(hw_read(ci, OP_PORTSC, PORTSC_CCS))) {
+ 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 (hw_read(ci, OP_USBSTS, USBSTS_PCI) &&
+ !(hw_read(ci, OP_PORTSC, PORTSC_CCS))) {
+ fsm->b_conn = 0;
+ disable_irq_nosync(ci->irq);
+ queue_work(ci->wq, &ci->work);
+ }
+ break;
+ case OTG_STATE_B_WAIT_ACON:
+ if (hw_read(ci, OP_USBSTS, USBSTS_PCI) &&
+ hw_read(ci, OP_PORTSC, PORTSC_CCS)) {
+ fsm->a_conn = 1;
+ disable_irq_nosync(ci->irq);
+ queue_work(ci->wq, &ci->work);
+ }
+ break;
+ default:
+ break;
+ }
+}
+
+/**
+ * ci_otg_irq - perform otg fsm related irq handling
+ * @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;
+
+ if ((ci == NULL) || !(ci->is_otg) ||
+ (ci->platdata->dr_mode != USB_DR_MODE_OTG))
+ return retval;
+
+ otgsc = hw_read(ci, OP_OTGSC, ~0);
+ otg_int_src = otgsc & OTGSC_INT_STATUS_BITS & (otgsc >> 8);
+ fsm->id = (otgsc & OTGSC_ID) ? 1 : 0;
+
+ /* process OTG interrupts: ID,A vbus vld,B sess Vld,1ms */
+ if (otg_int_src) {
+ if (otg_int_src & OTGSC_1MSIS) {
+ ci_clear_otg_interrupt(ci, OTGSC_1MSIS);
+ retval = ci_otg_tick_timer(ci);
+ return IRQ_HANDLED;
+ } else if (otg_int_src & OTGSC_DPIS) {
+ ci_clear_otg_interrupt(ci, OTGSC_DPIS);
+ fsm->a_srp_det = 1;
+ fsm->a_bus_drop = 0;
+ } else if (otg_int_src & OTGSC_IDIS) {
+ ci_clear_otg_interrupt(ci, OTGSC_IDIS);
+ if (fsm->id == 0) {
+ fsm->a_bus_req = 1;
+ ci->id_event = true;
+ }
+ } else if (otg_int_src & OTGSC_BSVIS) {
+ ci_clear_otg_interrupt(ci, 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) {
+ ci_clear_otg_interrupt(ci, 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, fsm);
+
+ return retval;
+}
+
+void ci_hdrc_otg_fsm_start(struct ci_hdrc *ci)
+{
+ if (ci->platdata->dr_mode == USB_DR_MODE_OTG) {
+ disable_irq_nosync(ci->irq);
+ queue_work(ci->wq, &ci->work);
+ }
+}
+
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 77b604b..2177a5e 100644
--- a/drivers/usb/chipidea/otg_fsm.h
+++ b/drivers/usb/chipidea/otg_fsm.h
@@ -104,6 +104,9 @@ 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
@@ -112,6 +115,21 @@ 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 */
--
1.7.8
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