/**
* This function handles the OTG Interrupts. It reads the OTG
* Interrupt Register (GOTGINT) to determine what interrupt has
* occurred.
*
* @param core_if Programming view of DWC_otg controller.
*/
int32_t dwc_otg_handle_otg_intr(dwc_otg_core_if_t * core_if)
{
dwc_otg_core_global_regs_t *global_regs = core_if->core_global_regs;
gotgint_data_t gotgint;
gotgctl_data_t gotgctl;
gintmsk_data_t gintmsk;
gpwrdn_data_t gpwrdn;
gotgint.d32 = DWC_READ_REG32(&global_regs->gotgint);
gotgctl.d32 = DWC_READ_REG32(&global_regs->gotgctl);
DWC_DEBUGPL(DBG_CIL, "++OTG Interrupt gotgint=%0x [%s]\n", gotgint.d32,
op_state_str(core_if));
if (gotgint.b.sesenddet) {
DWC_DEBUGPL(DBG_ANY, " ++OTG Interrupt: "
"Session End Detected++ (%s)\n",
op_state_str(core_if));
gotgctl.d32 = DWC_READ_REG32(&global_regs->gotgctl);
if (core_if->op_state == B_HOST) {
cil_pcd_start(core_if);
core_if->op_state = B_PERIPHERAL;
} else {
/* If not B_HOST and Device HNP still set. HNP
* Did not succeed!*/
if (gotgctl.b.devhnpen) {
DWC_DEBUGPL(DBG_ANY, "Session End Detected\n");
__DWC_ERROR("Device Not Connected/Responding!\n");
}
/* If Session End Detected the B-Cable has
* been disconnected. */
/* Reset PCD and Gadget driver to a
* clean state. */
core_if->lx_state = DWC_OTG_L0;
DWC_SPINUNLOCK(core_if->lock);
cil_pcd_stop(core_if);
DWC_SPINLOCK(core_if->lock);
if (core_if->adp_enable) {
if (core_if->power_down == 2) {
gpwrdn.d32 = 0;
gpwrdn.b.pwrdnswtch = 1;
DWC_MODIFY_REG32(&core_if->
core_global_regs->
gpwrdn, gpwrdn.d32, 0);
}
gpwrdn.d32 = 0;
gpwrdn.b.pmuintsel = 1;
gpwrdn.b.pmuactv = 1;
DWC_MODIFY_REG32(&core_if->core_global_regs->
gpwrdn, 0, gpwrdn.d32);
dwc_otg_adp_sense_start(core_if);
}
}
gotgctl.d32 = 0;
gotgctl.b.devhnpen = 1;
DWC_MODIFY_REG32(&global_regs->gotgctl, gotgctl.d32, 0);
}
if (gotgint.b.sesreqsucstschng) {
DWC_DEBUGPL(DBG_ANY, " ++OTG Interrupt: "
"Session Reqeust Success Status Change++\n");
gotgctl.d32 = DWC_READ_REG32(&global_regs->gotgctl);
if (gotgctl.b.sesreqscs) {
if ((core_if->core_params->phy_type ==
DWC_PHY_TYPE_PARAM_FS) && (core_if->core_params->i2c_enable)) {
core_if->srp_success = 1;
} else {
DWC_SPINUNLOCK(core_if->lock);
cil_pcd_resume(core_if);
DWC_SPINLOCK(core_if->lock);
/* Clear Session Request */
gotgctl.d32 = 0;
gotgctl.b.sesreq = 1;
DWC_MODIFY_REG32(&global_regs->gotgctl,
gotgctl.d32, 0);
}
}
}
if (gotgint.b.hstnegsucstschng) {
/* Print statements during the HNP interrupt handling
* can cause it to fail.*/
gotgctl.d32 = DWC_READ_REG32(&global_regs->gotgctl);
/* WA for 3.00a- HW is not setting cur_mode, even sometimes
* this does not help*/
if (core_if->snpsid >= OTG_CORE_REV_3_00a)
dwc_udelay(100);
if (gotgctl.b.hstnegscs) {
if (dwc_otg_is_host_mode(core_if)) {
core_if->op_state = B_HOST;
/*
* Need to disable SOF interrupt immediately.
* When switching from device to host, the PCD
* interrupt handler won't handle the
* interrupt if host mode is already set. The
* HCD interrupt handler won't get called if
* the HCD state is HALT. This means that the
* interrupt does not get handled and Linux
* complains loudly.
*/
gintmsk.d32 = 0;
gintmsk.b.sofintr = 1;
DWC_MODIFY_REG32(&global_regs->gintmsk,
gintmsk.d32, 0);
/* Call callback function with spin lock released */
DWC_SPINUNLOCK(core_if->lock);
cil_pcd_stop(core_if);
/*
* Initialize the Core for Host mode.
*/
cil_hcd_start(core_if);
DWC_SPINLOCK(core_if->lock);
core_if->op_state = B_HOST;
}
} else {
gotgctl.d32 = 0;
gotgctl.b.hnpreq = 1;
gotgctl.b.devhnpen = 1;
DWC_MODIFY_REG32(&global_regs->gotgctl, gotgctl.d32, 0);
DWC_DEBUGPL(DBG_ANY, "HNP Failed\n");
__DWC_ERROR("Device Not Connected/Responding\n");
}
}
if (gotgint.b.hstnegdet) {
/* The disconnect interrupt is set at the same time as
* Host Negotiation Detected. During the mode
* switch all interrupts are cleared so the disconnect
* interrupt handler will not get executed.
*/
DWC_DEBUGPL(DBG_ANY, " ++OTG Interrupt: "
"Host Negotiation Detected++ (%s)\n",
(dwc_otg_is_host_mode(core_if) ? "Host" :
"Device"));
if (dwc_otg_is_device_mode(core_if)) {
DWC_DEBUGPL(DBG_ANY, "a_suspend->a_peripheral (%d)\n",
core_if->op_state);
DWC_SPINUNLOCK(core_if->lock);
cil_hcd_disconnect(core_if);
cil_pcd_start(core_if);
DWC_SPINLOCK(core_if->lock);
core_if->op_state = A_PERIPHERAL;
} else {
/*
* Need to disable SOF interrupt immediately. When
* switching from device to host, the PCD interrupt
* handler won't handle the interrupt if host mode is
* already set. The HCD interrupt handler won't get
* called if the HCD state is HALT. This means that
* the interrupt does not get handled and Linux
* complains loudly.
*/
gintmsk.d32 = 0;
gintmsk.b.sofintr = 1;
DWC_MODIFY_REG32(&global_regs->gintmsk, gintmsk.d32, 0);
DWC_SPINUNLOCK(core_if->lock);
cil_pcd_stop(core_if);
cil_hcd_start(core_if);
DWC_SPINLOCK(core_if->lock);
core_if->op_state = A_HOST;
}
}
if (gotgint.b.adevtoutchng) {
DWC_DEBUGPL(DBG_ANY, " ++OTG Interrupt: "
"A-Device Timeout Change++\n");
}
if (gotgint.b.debdone) {
DWC_DEBUGPL(DBG_ANY, " ++OTG Interrupt: " "Debounce Done++\n");
}
/* Clear GOTGINT */
DWC_WRITE_REG32(&core_if->core_global_regs->gotgint, gotgint.d32);
return 1;
}
void w_conn_id_status_change(struct work_struct *work)
{
uint32_t count = 0;
gotgctl_data_t gotgctl = {.d32 = 0 };
dwc_otg_core_if_t *core_if = container_of(work,
dwc_otg_core_if_t, id_change_work.work);
mutex_lock(&core_if->id_change_mutex);
dwc_otg_disable_global_interrupts(core_if);
gotgctl.d32 = DWC_READ_REG32(&core_if->core_global_regs->gotgctl);
DWC_DEBUGPL(DBG_CIL, "gotgctl=%0x\n", gotgctl.d32);
DWC_DEBUGPL(DBG_CIL, "gotgctl.b.conidsts=%d\n", gotgctl.b.conidsts);
/* B-Device connector (Device Mode) */
if (gotgctl.b.conidsts) {
/* Wait for switch to device mode. */
while (!dwc_otg_is_device_mode(core_if)) {
DWC_PRINTF("Waiting for Peripheral Mode, Mode=%s\n",
(dwc_otg_is_host_mode(core_if) ? "Host" :
"Peripheral"));
dwc_msleep(10);
if (++count > 10000)
break;
}
DWC_ASSERT(++count < 10000,
"Connection id status change timed out");
core_if->op_state = B_PERIPHERAL;
dwc_otg_core_init(core_if);
cil_pcd_start(core_if);
dwc_otg_enable_global_interrupts(core_if);
k3v2_otg_id_status_change(ID_RISE);
} else {
/* A-Device connector (Host Mode) */
while (!dwc_otg_is_host_mode(core_if)) {
DWC_PRINTF("Waiting for Host Mode, Mode=%s\n",
(dwc_otg_is_host_mode(core_if) ? "Host" :
"Peripheral"));
dwc_msleep(10);
if (++count > 10000)
break;
}
DWC_ASSERT(++count < 10000,
"Connection id status change timed out");
core_if->op_state = A_HOST;
/* Because host reset will be device mode, so partial reset */
dwc_otg_core_reinit(core_if);
msleep(100);
if (dwc_otg_is_host_mode(core_if)) {
core_if->op_state = A_HOST;
printk(KERN_INFO "[usbotg][%s]:usb mode %s\n", __func__, "Host");
}
cil_hcd_start(core_if);
//dwc_otg_enable_global_interrupts(core_if);
}
mutex_unlock(&core_if->id_change_mutex);
}
/**
* This function handles the Connector ID Status Change Interrupt. It
* reads the OTG Interrupt Register (GOTCTL) to determine whether this
* is a Device to Host Mode transition or a Host Mode to Device
* Transition.
*
* This only occurs when the cable is connected/removed from the PHY
* connector.
*
* @param core_if Programming view of DWC_otg controller.
*/
static int32_t dwc_otg_handle_conn_id_status_change_intr(dwc_otg_core_if_t * core_if)
{
/*
* Need to disable SOF interrupt immediately. If switching from device
* to host, the PCD interrupt handler won't handle the interrupt if
* host mode is already set. The HCD interrupt handler won't get
* called if the HCD state is HALT. This means that the interrupt does
* not get handled and Linux complains loudly.
*/
gintmsk_data_t gintmsk = {.d32 = 0 };
gintsts_data_t gintsts = {.d32 = 0 };
gintmsk.b.sofintr = 1;
DWC_MODIFY_REG32(&core_if->core_global_regs->gintmsk, gintmsk.d32, 0);
DWC_DEBUGPL(DBG_CIL,
" ++Connector ID Status Change Interrupt++ (%s)\n",
(dwc_otg_is_host_mode(core_if) ? "Host" : "Device"));
printk(KERN_INFO "[usbotg][%s]:usb mode %s\n", __func__,
(dwc_otg_is_host_mode(core_if) ? "Host" : "Device"));
/*
* Need to schedule a work, as there are possible DELAY function calls
* Release lock before scheduling workq as it holds spinlock during scheduling
*/
dwc_otg_disable_global_interrupts(core_if);
schedule_delayed_work(&core_if->id_change_work, 0);
/* Set flag and clear interrupt */
gintsts.b.conidstschng = 1;
DWC_WRITE_REG32(&core_if->core_global_regs->gintsts, gintsts.d32);
return 1;
}
/**
* This interrupt indicates that a device is initiating the Session
* Request Protocol to request the host to turn on bus power so a new
* session can begin. The handler responds by turning on bus power. If
* the DWC_otg controller is in low power mode, the handler brings the
* controller out of low power mode before turning on bus power.
*
* @param core_if Programming view of DWC_otg controller.
*/
static int32_t dwc_otg_handle_session_req_intr(dwc_otg_core_if_t * core_if)
{
hprt0_data_t hprt0;
gintsts_data_t gintsts;
#ifndef DWC_HOST_ONLY
DWC_DEBUGPL(DBG_ANY, "++Session Request Interrupt++\n");
if (dwc_otg_is_device_mode(core_if)) {
DWC_PRINTF("SRP: Device mode\n");
} else {
DWC_PRINTF("SRP: Host mode\n");
/* Turn on the port power bit. */
hprt0.d32 = dwc_otg_read_hprt0(core_if);
hprt0.b.prtpwr = 1;
DWC_WRITE_REG32(core_if->host_if->hprt0, hprt0.d32);
/* Start the Connection timer. So a message can be displayed
* if connect does not occur within 10 seconds. */
cil_hcd_session_start(core_if);
}
#endif
/* Clear interrupt */
gintsts.d32 = 0;
gintsts.b.sessreqintr = 1;
DWC_WRITE_REG32(&core_if->core_global_regs->gintsts, gintsts.d32);
return 1;
}
void w_wakeup_detected(void *p)
{
dwc_otg_core_if_t *core_if = (dwc_otg_core_if_t *) p;
/*
* Clear the Resume after 70ms. (Need 20 ms minimum. Use 70 ms
* so that OPT tests pass with all PHYs).
*/
hprt0_data_t hprt0 = {.d32 = 0 };
#if 0
pcgcctl_data_t pcgcctl = {.d32 = 0 };
/* Restart the Phy Clock */
pcgcctl.b.stoppclk = 1;
DWC_MODIFY_REG32(core_if->pcgcctl, pcgcctl.d32, 0);
dwc_udelay(10);
#endif
hprt0.d32 = dwc_otg_read_hprt0(core_if);
DWC_DEBUGPL(DBG_ANY, "Resume: HPRT0=%0x\n", hprt0.d32);
// dwc_mdelay(70);
hprt0.b.prtres = 0; /* Resume */
DWC_WRITE_REG32(core_if->host_if->hprt0, hprt0.d32);
DWC_DEBUGPL(DBG_ANY, "Clear Resume: HPRT0=%0x\n",
DWC_READ_REG32(core_if->host_if->hprt0));
cil_hcd_resume(core_if);
/** Change to L0 state*/
core_if->lx_state = DWC_OTG_L0;
}
/**
* This interrupt indicates that the DWC_otg controller has detected a
* resume or remote wakeup sequence. If the DWC_otg controller is in
* low power mode, the handler must brings the controller out of low
* power mode. The controller automatically begins resume
* signaling. The handler schedules a time to stop resume signaling.
*/
static int32_t dwc_otg_handle_wakeup_detected_intr(dwc_otg_core_if_t * core_if)
{
gintsts_data_t gintsts;
DWC_DEBUGPL(DBG_ANY,
"++Resume and Remote Wakeup Detected Interrupt++\n");
DWC_PRINTF("%s lxstate = %d\n", __func__, core_if->lx_state);
if (dwc_otg_is_device_mode(core_if)) {
dctl_data_t dctl = {.d32 = 0 };
DWC_DEBUGPL(DBG_PCD, "DSTS=0x%0x\n",
DWC_READ_REG32(&core_if->dev_if->
dev_global_regs->dsts));
if (core_if->lx_state == DWC_OTG_L2) {
#ifdef PARTIAL_POWER_DOWN
if (core_if->hwcfg4.b.power_optimiz) {
pcgcctl_data_t power = {.d32 = 0 };
power.d32 = DWC_READ_REG32(core_if->pcgcctl);
DWC_DEBUGPL(DBG_CIL, "PCGCCTL=%0x\n",
power.d32);
power.b.stoppclk = 0;
DWC_WRITE_REG32(core_if->pcgcctl, power.d32);
power.b.pwrclmp = 0;
DWC_WRITE_REG32(core_if->pcgcctl, power.d32);
power.b.rstpdwnmodule = 0;
DWC_WRITE_REG32(core_if->pcgcctl, power.d32);
}
#endif
/* Clear the Remote Wakeup Signaling */
dctl.b.rmtwkupsig = 1;
DWC_MODIFY_REG32(&core_if->dev_if->
dev_global_regs->dctl, dctl.d32, 0);
DWC_SPINUNLOCK(core_if->lock);
cil_pcd_resume(core_if);
DWC_SPINLOCK(core_if->lock);
} else {
glpmcfg_data_t lpmcfg;
lpmcfg.d32 =
DWC_READ_REG32(&core_if->core_global_regs->glpmcfg);
lpmcfg.b.hird_thres &= (~(1 << 4));
DWC_WRITE_REG32(&core_if->core_global_regs->glpmcfg,
lpmcfg.d32);
}
/** Change to L0 state*/
core_if->lx_state = DWC_OTG_L0;
} else {
if (core_if->lx_state != DWC_OTG_L1) {
pcgcctl_data_t pcgcctl = {.d32 = 0 };
/* Restart the Phy Clock */
pcgcctl.b.stoppclk = 1;
DWC_MODIFY_REG32(core_if->pcgcctl, pcgcctl.d32, 0);
DWC_TIMER_SCHEDULE(core_if->wkp_timer, 71);
} else {
/** Change to L0 state*/
core_if->lx_state = DWC_OTG_L0;
}
}
