honeybuns: Add C2 initialization with power button on/off

This CL refactors code required for the user facing usbc port. This
port was only being initialized at init time and therefore would not
function properly following a power button off/on.

To avoid duplicating code, the functions used to initialize this port
and control VBUS were moved to usbc_support in baseboard so they can
be common and are now guarded by a GPIO macro so this can be board
specific for variants which don't have a PPC to control on this port.

BUG=b:164157329
BRANCH=quiche
TEST=Verifed that port C2 attaches as expected following power button
off/on sequence.

Signed-off-by: Scott Collyer <scollyer@google.com>
Change-Id: I2f9500f7e58de674c6f7c12a95cebad45de166cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2785198
Reviewed-by: Diana Z <dzigterman@chromium.org>
Commit-Queue: Scott Collyer <scollyer@chromium.org>
Tested-by: Scott Collyer <scollyer@chromium.org>

3 files changed, 73 insertions, 0 deletions

diff --git a/baseboard/honeybuns/baseboard.c b/baseboard/honeybuns/baseboard.c
index 3425417b81..394a0bae28 100644
--- a/baseboard/honeybuns/baseboard.c
+++ b/baseboard/honeybuns/baseboard.c
@@ -200,6 +200,11 @@ static void baseboard_init(void)
 		baseboard_set_mst_lane_control(dock_mf);
 	}
 
+#ifdef GPIO_USBC_UF_ATTACHED_SRC
+	/* Configure UF usbc ppc and check usbc state */
+	baseboard_config_usbc_usb3_ppc();
+#endif /* GPIO_USBC_UF_ATTACHED_SRC */
+
 	/* Enable power button interrupt */
 	gpio_enable_interrupt(GPIO_PWR_BTN);
 	/* Set dock mf preference LED */
@@ -248,6 +253,10 @@ static void baseboard_power_on(void)
 	}
 	/* Enable usbc interrupts */
 	board_enable_usbc_interrupts();
+
+#ifdef GPIO_USBC_UF_ATTACHED_SRC
+	baseboard_config_usbc_usb3_ppc();
+#endif
 }
 
 static void baseboard_power_off(void)
diff --git a/baseboard/honeybuns/baseboard.h b/baseboard/honeybuns/baseboard.h
index a8b8e9e902..01b0e4e686 100644
--- a/baseboard/honeybuns/baseboard.h
+++ b/baseboard/honeybuns/baseboard.h
@@ -234,6 +234,7 @@ enum adc_channel {
 
 extern const struct power_seq board_power_seq[];
 extern const size_t board_power_seq_count;
+
 void baseboard_power_button_evt(int level);
 
 /*
@@ -253,6 +254,22 @@ int baseboard_usbc_init(int port);
 int dock_get_mf_preference(void);
 
 /*
+ * Initialize and configure PPC used for USB3 only port
+ *
+ * @return EC success if PPC initialization is successful
+ */
+int baseboard_config_usbc_usb3_ppc(void);
+
+/*
+ * Called from interrupt handler for PS8803 attached.src gpio. This gpio signal
+ * will be set high by the PS8803 when it's in the attached.src state and low
+ * otherwise. For boards wich have a PPC on this port, this signal is used to
+ * enable/disable VBUS in the PPC.
+ */
+void baseboard_usb3_check_state(void);
+
+
+/*
  * Set MST_LANE_CONTROL gpio to match the DP pin configuration selected
  * by the host in the DP Configure SVDM message.
  *
diff --git a/baseboard/honeybuns/usbc_support.c b/baseboard/honeybuns/usbc_support.c
index baa22a65dc..1ca7be6fe3 100644
--- a/baseboard/honeybuns/usbc_support.c
+++ b/baseboard/honeybuns/usbc_support.c
@@ -20,6 +20,8 @@
 #include "registers.h"
 #include "ucpd-stm32gx.h"
 
+#define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ## args)
+#define CPRINTF(format, args...) cprintf(CC_SYSTEM, format, ## args)
 
 static void baseboard_ucpd_apply_rd(int port)
 {
@@ -135,3 +137,48 @@ int baseboard_usbc_init(int port)
 	return rv;
 }
 
+#if defined(GPIO_USBC_UF_ATTACHED_SRC) && defined(SECTION_IS_RW)
+static void baseboard_usb3_manage_vbus(void)
+{
+	int level = gpio_get_level(GPIO_USBC_UF_ATTACHED_SRC);
+
+	/*
+	 * GPIO_USBC_UF_MUX_VBUS_EN is an output from the PS8803 which tracks if
+	 * C2 is attached. When it's attached, this signal will be high. Use
+	 * this level to control PPC VBUS on/off.
+	 */
+	ppc_vbus_source_enable(USB_PD_PORT_USB3, level);
+	CPRINTS("C2: State = %s", level ? "Attached.SRC " : "Unattached.SRC");
+}
+DECLARE_DEFERRED(baseboard_usb3_manage_vbus);
+
+void baseboard_usb3_check_state(void)
+{
+	hook_call_deferred(&baseboard_usb3_manage_vbus_data, 0);
+}
+
+int baseboard_config_usbc_usb3_ppc(void)
+{
+	int rv;
+
+	/*
+	 * This port is not usb-pd capable, but there is a ppc which must be
+	 * initialized, and keep the VBUS switch enabled.
+	 */
+	rv = ppc_init(USB_PD_PORT_USB3);
+	if (rv)
+		return rv;
+
+	/* Need to set current limit to 3A to match advertised value */
+	ppc_set_vbus_source_current_limit(USB_PD_PORT_USB3, TYPEC_RP_3A0);
+
+	/* Check state at init time */
+	baseboard_usb3_manage_vbus();
+
+	/* Enable VBUS control interrupt for C2 */
+	gpio_enable_interrupt(GPIO_USBC_UF_ATTACHED_SRC);
+
+	return EC_SUCCESS;
+}
+#endif
+