it83xx/intc:add type-c plug in interrupt

  When tcpc detect type-c plug in (cc lines voltage change),
it will interrupt fw to wake pd task, so task can react
immediately.

BRANCH=None
BUG=None
TEST=GRL USBPD test

Change-Id: I194b2fcad1d0c62dde2d3296753abd47af8feea6
Signed-off-by: Ruibin Chang <Ruibin.Chang@ite.com.tw>
Reviewed-on: https://chromium-review.googlesource.com/1333207
Reviewed-by: Jett Rink <jettrink@chromium.org>

5 files changed, 53 insertions, 0 deletions

diff --git a/chip/it83xx/config_chip.h b/chip/it83xx/config_chip.h
index 26f81f124d..9991d518e7 100644
--- a/chip/it83xx/config_chip.h
+++ b/chip/it83xx/config_chip.h
@@ -114,6 +114,8 @@
 #define IT83XX_GPIO_INT_FLEXIBLE
 /* Enable interrupts of group 21 and 22. */
 #define IT83XX_INTC_GROUP_21_22_SUPPORT
+/* Enable detect type-c plug in interrupt. */
+#define IT83XX_INTC_PLUG_IN_SUPPORT
 #else
 #error "Unsupported chip variant!"
 #endif
diff --git a/chip/it83xx/intc.c b/chip/it83xx/intc.c
index 36a6029f9c..79d738e93c 100644
--- a/chip/it83xx/intc.c
+++ b/chip/it83xx/intc.c
@@ -81,6 +81,28 @@ static void chip_pd_irq(enum usbpd_port port)
 			task_set_event(PD_PORT_TO_TASK_ID(port),
 				TASK_EVENT_PHY_TX_DONE, 0);
 		}
+#ifdef IT83XX_INTC_PLUG_IN_SUPPORT
+		if (USBPD_IS_PLUG_IN_OUT_DETECT(port)) {
+			/*
+			 * When tcpc detect type-c plug in, then disable
+			 * this interrupt. Because any cc volt changes
+			 * (include pd negotiation) would trigger plug in
+			 * interrupt, frequently plug in interrupt and wakeup
+			 * pd task may cause task starvation or device dead
+			 * (ex.transmit lots SRC_Cap).
+			 *
+			 * When polling disconnect will enable detect type-c
+			 * plug in again.
+			 *
+			 * Clear detect type-c plug in interrupt status.
+			 */
+			IT83XX_USBPD_TCDCR(port) |=
+				(USBPD_REG_PLUG_IN_OUT_DETECT_DISABLE |
+				 USBPD_REG_PLUG_IN_OUT_DETECT_STAT);
+			task_set_event(PD_PORT_TO_TASK_ID(port),
+				PD_EVENT_CC, 0);
+		}
+#endif //IT83XX_INTC_PLUG_IN_SUPPORT
 	}
 }
 #endif
diff --git a/chip/it83xx/registers.h b/chip/it83xx/registers.h
index cd7fcc0c2a..8d2d8016bb 100644
--- a/chip/it83xx/registers.h
+++ b/chip/it83xx/registers.h
@@ -1250,6 +1250,14 @@ enum i2c_channels {
 #define IT83XX_USBPD_CCPSR0(p)    REG8(IT83XX_USBPD_BASE(p)+0x60)
 #define IT83XX_USBPD_BMCSR(p)     REG8(IT83XX_USBPD_BASE(p)+0x64)
 #define IT83XX_USBPD_PDMHSR(p)    REG8(IT83XX_USBPD_BASE(p)+0x65)
+#ifdef IT83XX_INTC_PLUG_IN_SUPPORT
+#define IT83XX_USBPD_TCDCR(p)     REG8(IT83XX_USBPD_BASE(p)+0x67)
+#define USBPD_REG_PLUG_OUT_DETECT_TYPE_SELECT  (1 << 7)
+#define USBPD_REG_MASK_TYPEC_PLUG_IN_OUT_ISR   (1 << 4)
+#define USBPD_REG_PLUG_IN_OUT_SELECT           (1 << 3)
+#define USBPD_REG_PLUG_IN_OUT_DETECT_DISABLE   (1 << 1)
+#define USBPD_REG_PLUG_IN_OUT_DETECT_STAT      (1 << 0)
+#endif //IT83XX_INTC_PLUG_IN_SUPPORT
 
 enum usbpd_port {
 	USBPD_PORT_A,
diff --git a/driver/tcpm/it83xx.c b/driver/tcpm/it83xx.c
index 447ba7fd1d..3cf554cf76 100644
--- a/driver/tcpm/it83xx.c
+++ b/driver/tcpm/it83xx.c
@@ -361,6 +361,16 @@ static void it83xx_init(enum usbpd_port port, int role)
 	/* enable tx done and reset detect interrupt */
 	IT83XX_USBPD_IMR(port) &= ~(USBPD_REG_MASK_MSG_TX_DONE |
 					USBPD_REG_MASK_HARD_RESET_DETECT);
+#ifdef IT83XX_INTC_PLUG_IN_SUPPORT
+	/*
+	 * when tcpc detect type-c plug in (cc lines voltage change), it will
+	 * interrupt fw to wake pd task, so task can react immediately.
+	 *
+	 * w/c status and unmask TCDCR (detect type-c plug in interrupt default
+	 * is enable).
+	 */
+	IT83XX_USBPD_TCDCR(port) = USBPD_REG_PLUG_IN_OUT_DETECT_STAT;
+#endif //IT83XX_INTC_PLUG_IN_SUPPORT
 	IT83XX_USBPD_CCPSR(port) = 0xff;
 	/* cc connect */
 	IT83XX_USBPD_CCCSR(port) = 0;
@@ -581,6 +591,13 @@ static void it83xx_tcpm_sw_reset(void)
 	int port = TASK_ID_TO_PD_PORT(task_get_current());
 	/* Invalidate last received message id variable */
 	invalidate_last_message_id(port);
+#ifdef IT83XX_INTC_PLUG_IN_SUPPORT
+	/*
+	 * Enable detect type-c plug in interrupt, since the pd task has
+	 * detected a type-c physical disconnected.
+	 */
+	IT83XX_USBPD_TCDCR(port) &= ~USBPD_REG_PLUG_IN_OUT_DETECT_DISABLE;
+#endif //IT83XX_INTC_PLUG_IN_SUPPORT
 	/* exit BIST test data mode */
 	USBPD_SW_RESET(port);
 }
diff --git a/driver/tcpm/it83xx_pd.h b/driver/tcpm/it83xx_pd.h
index c0714dd9b1..0f6be9b24f 100644
--- a/driver/tcpm/it83xx_pd.h
+++ b/driver/tcpm/it83xx_pd.h
@@ -70,6 +70,10 @@
 	IS_MASK_SET(IT83XX_USBPD_ISR(port), USBPD_REG_MASK_MSG_TX_DONE)
 #define USBPD_IS_RX_DONE(port)           \
 	IS_MASK_SET(IT83XX_USBPD_ISR(port), USBPD_REG_MASK_MSG_RX_DONE)
+#ifdef IT83XX_INTC_PLUG_IN_SUPPORT
+#define USBPD_IS_PLUG_IN_OUT_DETECT(port)\
+	IS_MASK_SET(IT83XX_USBPD_TCDCR(port), USBPD_REG_PLUG_IN_OUT_DETECT_STAT)
+#endif //IT83XX_INTC_PLUG_IN_SUPPORT
 
 enum usbpd_cc_pin {
 	USBPD_CC_PIN_1,