chocodile_vpdmcu: Firmware for chocodile mcu

Implement Chocodile Charge-Through Vconn Powered firmware for mcu
using new Type-C/PD State machine stack.

BUG=b:115626873
BRANCH=none
TEST=manual
  Charge-Through was tested on an Atlas running a DRP USB-C/PD state
  machine with CTUnattached.SNK and CTAttached.SNK states.

Signed-off-by: Sam Hurst <shurst@chromium.org>
Change-Id: I847f1bcd2fc3ce41e66edd133a10c943d5e8c819
Reviewed-on: https://chromium-review.googlesource.com/1225250
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Sam Hurst <shurst@google.com>
Reviewed-by: Stefan Reinauer <reinauer@google.com>

1 files changed, 80 insertions, 0 deletions

diff --git a/board/chocodile_vpdmcu/gpio.inc b/board/chocodile_vpdmcu/gpio.inc
new file mode 100644
index 0000000000..a34c617ef1
--- /dev/null
+++ b/board/chocodile_vpdmcu/gpio.inc
@@ -0,0 +1,80 @@
+/* -*- mode:c -*-
+ *
+ * Copyright 2019 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Declare symbolic names for all the GPIOs that we care about.
+ * Note: Those with interrupt handlers must be declared first. */
+
+/* Divided Vconn voltage sense */
+GPIO(VCONN_VSENSE,        PIN(A, 0),  GPIO_ANALOG)
+/* CC ADC, PD in comparator, or tx enable out (low) */
+GPIO(CC_VPDMCU,           PIN(A, 1),  GPIO_ANALOG)
+/* CC 0.2V comparator during charge-through, active Rd (low) or Rp3A0 (high) */
+GPIO(CC_RP3A0_RD_L,       PIN(A, 2),  GPIO_ANALOG)
+/* 0.2V resistor divider for various CC comapators */
+GPIO(RDCONNECT_REF,       PIN(A, 3),  GPIO_ANALOG)
+/* Charger CC1 0.2V comparator and ADC, drive a Rp3A0 (high) or Rd (low) */
+GPIO(CC1_RP3A0_RD_L,       PIN(A, 4),  GPIO_ANALOG)
+/* Charger CC2 0.2V comparator and ADC, drive a Rp3A0 (high) or Rd (low) */
+GPIO(CC2_RP3A0_RD_L,       PIN(A, 5),  GPIO_ANALOG)
+/* Divided host VBUS voltage sense */
+GPIO(HOST_VBUS_VSENSE,    PIN(A, 6),  GPIO_ANALOG)
+/* Divided charger VBUS voltage sense */
+GPIO(CHARGER_VBUS_VSENSE, PIN(A, 7),  GPIO_ANALOG)
+/* Charger CC1 ADC, or drive a RpUSB (high) */
+GPIO(CC1_RPUSB_ODH,       PIN(B, 0), GPIO_ANALOG)
+/* Charger CC2 ADC, or drive a RpUSB (high) */
+GPIO(CC2_RPUSB_ODH,       PIN(B, 1), GPIO_ANALOG)
+
+/* PD TX data output */
+GPIO(CC_TX_DATA,          PIN(B, 4), GPIO_INPUT)
+
+/* Enables the VBUS pass-through (high) */
+GPIO(VBUS_PASS_EN,        PIN(B, 2), GPIO_OUT_LOW)
+
+/*
+ * Desired billboard state. One of "no billboard/nothing connected" (low),
+ * "source connected but not in charge-through" (pull-up), or "sink connected"
+ * (high)
+ */
+GPIO(PRESENT_BILLBOARD,   PIN(A, 8),  GPIO_OUT_LOW)
+
+/* Enables cReceiver and the path to the PD RX/TX, RpUSB, and Rp1A5 */
+GPIO(VPDMCU_CC_EN,        PIN(A, 11),  GPIO_OUT_LOW)
+
+/* Disables dead battery Rd on host side (low) */
+GPIO(CC_DB_EN_OD,         PIN(A, 12),  GPIO_ODR_HIGH)
+
+/* RpUSB on host side (high) */
+GPIO(CC_RPUSB_ODH,        PIN(A, 13),  GPIO_INPUT)
+
+/*
+ * Controls the dead-battery pull-downs on charger side; either dead battery
+ * Rd (low) or Hi-Z (high)
+ */
+GPIO(CC1_CC2_DB_EN_L,        PIN(A, 15),  GPIO_OUT_LOW)
+
+/* Chooses between Vconn (low) and VBUS (high) */
+GPIO(VCONN_PWR_SEL_ODL,   PIN(B, 6), GPIO_INPUT)
+
+/* Passes CC1 to the host CC (high) */
+GPIO(CC1_SEL,             PIN(F, 0), GPIO_OUT_LOW)
+/* Passes CC2 to the host CC (high) */
+GPIO(CC2_SEL,             PIN(F, 1), GPIO_OUT_LOW)
+/* Debug red LED driver (low). Keep off for power measurements */
+GPIO(DEBUG_LED_R_L,       PIN(B, 5), GPIO_ODR_HIGH)
+/* Debug green LED driver (low). Keep off for power measurements */
+GPIO(DEBUG_LED_G_L,       PIN(B, 7), GPIO_ODR_HIGH)
+
+UNIMPLEMENTED(WP_L)
+UNIMPLEMENTED(ENTERING_RW)
+
+/* SCK(PB3): PD_TX_CLK_IN - Clock input for PD TX */
+ALTERNATE(PIN_MASK(B, 0x0008), 0, MODULE_USB_PD, 0)
+/* TIM16_CH1(PB8): PD_TX_CLK_OUT - Clock generator for PD TX */
+ALTERNATE(PIN_MASK(B, 0x0100), 2, MODULE_USB_PD, 0)
+/* USART1 (PA9/PA10): TX/RX for debug and programming */
+ALTERNATE(PIN_MASK(A, 0x0600), 1, MODULE_UART,   0)