servo_v4p1: Add support for alternate charger port

A TypeC charger can be attached to the alternate charger
port to supply up to 15W to the servoV4.1.

BRANCH=none
BUG=b:146793000
TEST=make -j buildall

Signed-off-by: Sam Hurst <shurst@google.com>
Change-Id: Ia88c783d23d09bfc12b34d416af98445db2d75c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2270696
Reviewed-by: Brian Nemec <bnemec@chromium.org>

1 files changed, 239 insertions, 0 deletions

diff --git a/board/servo_v4p1/fusb302b.h b/board/servo_v4p1/fusb302b.h
new file mode 100644
index 0000000000..2f0cd207b8
--- /dev/null
+++ b/board/servo_v4p1/fusb302b.h
@@ -0,0 +1,239 @@
+/* Copyright 2020 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.
+ */
+
+/* USB Power delivery port management */
+/* For Fairchild FUSB302 */
+#ifndef __CROS_EC_DRIVER_TCPM_FUSB302_H
+#define __CROS_EC_DRIVER_TCPM_FUSB302_H
+
+/* Chip Device ID - 302A or 302B */
+#define FUSB302_DEVID_302A 0x08
+#define FUSB302_DEVID_302B 0x09
+
+/* I2C slave address varies by part number */
+/* FUSB302BUCX / FUSB302BMPX */
+#define FUSB302_I2C_SLAVE_ADDR_FLAGS 0x22
+/* FUSB302B01MPX */
+#define FUSB302_I2C_SLAVE_ADDR_B01_FLAGS 0x23
+/* FUSB302B10MPX */
+#define FUSB302_I2C_SLAVE_ADDR_B10_FLAGS 0x24
+/* FUSB302B11MPX */
+#define FUSB302_I2C_SLAVE_ADDR_B11_FLAGS 0x25
+
+/* Default retry count for transmitting */
+#define PD_RETRY_COUNT		3
+
+#define TCPC_REG_DEVICE_ID	0x01
+
+#define TCPC_REG_SWITCHES0	0x02
+#define TCPC_REG_SWITCHES0_CC2_PU_EN	(1<<7)
+#define TCPC_REG_SWITCHES0_CC1_PU_EN	(1<<6)
+#define TCPC_REG_SWITCHES0_VCONN_CC2	(1<<5)
+#define TCPC_REG_SWITCHES0_VCONN_CC1	(1<<4)
+#define TCPC_REG_SWITCHES0_MEAS_CC2	(1<<3)
+#define TCPC_REG_SWITCHES0_MEAS_CC1	(1<<2)
+#define TCPC_REG_SWITCHES0_CC2_PD_EN	(1<<1)
+#define TCPC_REG_SWITCHES0_CC1_PD_EN	(1<<0)
+
+#define TCPC_REG_SWITCHES1	0x03
+#define TCPC_REG_SWITCHES1_POWERROLE	(1<<7)
+#define TCPC_REG_SWITCHES1_SPECREV1	(1<<6)
+#define TCPC_REG_SWITCHES1_SPECREV0	(1<<5)
+#define TCPC_REG_SWITCHES1_DATAROLE	(1<<4)
+#define TCPC_REG_SWITCHES1_AUTO_GCRC	(1<<2)
+#define TCPC_REG_SWITCHES1_TXCC2_EN	(1<<1)
+#define TCPC_REG_SWITCHES1_TXCC1_EN	(1<<0)
+
+#define TCPC_REG_MEASURE	0x04
+#define TCPC_REG_MEASURE_MDAC_MASK	0x3F
+#define TCPC_REG_MEASURE_VBUS		(1<<6)
+/*
+ * MDAC reference voltage step size is 42 mV. Round our thresholds to reduce
+ * maximum error, which also matches suggested thresholds in datasheet
+ * (Table 3. Host Interrupt Summary).
+ */
+#define TCPC_REG_MEASURE_MDAC_MV(mv)	(DIV_ROUND_NEAREST((mv), 42) & 0x3f)
+
+#define TCPC_REG_CONTROL0	0x06
+#define TCPC_REG_CONTROL0_TX_FLUSH	(1<<6)
+#define TCPC_REG_CONTROL0_INT_MASK	(1<<5)
+#define TCPC_REG_CONTROL0_HOST_CUR_MASK (3<<2)
+#define TCPC_REG_CONTROL0_HOST_CUR_3A0  (3<<2)
+#define TCPC_REG_CONTROL0_HOST_CUR_1A5  (2<<2)
+#define TCPC_REG_CONTROL0_HOST_CUR_USB  (1<<2)
+#define TCPC_REG_CONTROL0_TX_START	(1<<0)
+
+#define TCPC_REG_CONTROL1	0x07
+#define TCPC_REG_CONTROL1_ENSOP2DB	(1<<6)
+#define TCPC_REG_CONTROL1_ENSOP1DB	(1<<5)
+#define TCPC_REG_CONTROL1_BIST_MODE2	(1<<4)
+#define TCPC_REG_CONTROL1_RX_FLUSH	(1<<2)
+#define TCPC_REG_CONTROL1_ENSOP2	(1<<1)
+#define TCPC_REG_CONTROL1_ENSOP1	(1<<0)
+
+#define TCPC_REG_CONTROL2	0x08
+/* two-bit field, valid values below */
+#define TCPC_REG_CONTROL2_MODE_MASK	(0x3<<TCPC_REG_CONTROL2_MODE_POS)
+#define TCPC_REG_CONTROL2_MODE_DFP	(0x3)
+#define TCPC_REG_CONTROL2_MODE_UFP	(0x2)
+#define TCPC_REG_CONTROL2_MODE_DRP	(0x1)
+#define TCPC_REG_CONTROL2_MODE_POS	(1)
+#define TCPC_REG_CONTROL2_TOGGLE	(1<<0)
+
+#define TCPC_REG_CONTROL3	0x09
+#define TCPC_REG_CONTROL3_SEND_HARDRESET	(1<<6)
+#define TCPC_REG_CONTROL3_BIST_TMODE		(1<<5) /* 302B Only */
+#define TCPC_REG_CONTROL3_AUTO_HARDRESET	(1<<4)
+#define TCPC_REG_CONTROL3_AUTO_SOFTRESET	(1<<3)
+/* two-bit field */
+#define TCPC_REG_CONTROL3_N_RETRIES		(1<<1)
+#define TCPC_REG_CONTROL3_N_RETRIES_POS		(1)
+#define TCPC_REG_CONTROL3_N_RETRIES_SIZE	(2)
+#define TCPC_REG_CONTROL3_AUTO_RETRY		(1<<0)
+
+#define TCPC_REG_MASK		0x0A
+#define TCPC_REG_MASK_VBUSOK		(1<<7)
+#define TCPC_REG_MASK_ACTIVITY		(1<<6)
+#define TCPC_REG_MASK_COMP_CHNG		(1<<5)
+#define TCPC_REG_MASK_CRC_CHK		(1<<4)
+#define TCPC_REG_MASK_ALERT		(1<<3)
+#define TCPC_REG_MASK_WAKE		(1<<2)
+#define TCPC_REG_MASK_COLLISION		(1<<1)
+#define TCPC_REG_MASK_BC_LVL		(1<<0)
+
+#define TCPC_REG_POWER		0x0B
+#define TCPC_REG_POWER_PWR		(1<<0)	/* four-bit field */
+#define TCPC_REG_POWER_PWR_LOW		0x1 /* Bandgap + Wake circuitry */
+#define TCPC_REG_POWER_PWR_MEDIUM	0x3 /* LOW + Receiver + Current refs */
+#define TCPC_REG_POWER_PWR_HIGH		0x7 /* MEDIUM + Measure block */
+#define TCPC_REG_POWER_PWR_ALL		0xF /* HIGH + Internal Oscillator */
+
+#define TCPC_REG_RESET		0x0C
+#define TCPC_REG_RESET_PD_RESET		(1<<1)
+#define TCPC_REG_RESET_SW_RESET		(1<<0)
+
+#define TCPC_REG_MASKA		0x0E
+#define TCPC_REG_MASKA_OCP_TEMP		(1<<7)
+#define TCPC_REG_MASKA_TOGDONE		(1<<6)
+#define TCPC_REG_MASKA_SOFTFAIL		(1<<5)
+#define TCPC_REG_MASKA_RETRYFAIL	(1<<4)
+#define TCPC_REG_MASKA_HARDSENT		(1<<3)
+#define TCPC_REG_MASKA_TX_SUCCESS	(1<<2)
+#define TCPC_REG_MASKA_SOFTRESET	(1<<1)
+#define TCPC_REG_MASKA_HARDRESET	(1<<0)
+
+#define TCPC_REG_MASKB		0x0F
+#define TCPC_REG_MASKB_GCRCSENT		(1<<0)
+
+#define TCPC_REG_STATUS0A	0x3C
+#define TCPC_REG_STATUS0A_SOFTFAIL	(1<<5)
+#define TCPC_REG_STATUS0A_RETRYFAIL	(1<<4)
+#define TCPC_REG_STATUS0A_POWER		(1<<2) /* two-bit field */
+#define TCPC_REG_STATUS0A_RX_SOFT_RESET	(1<<1)
+#define TCPC_REG_STATUS0A_RX_HARD_RESEt	(1<<0)
+
+#define TCPC_REG_STATUS1A	0x3D
+/* three-bit field, valid values below */
+#define TCPC_REG_STATUS1A_TOGSS		(1<<3)
+#define TCPC_REG_STATUS1A_TOGSS_RUNNING		0x0
+#define TCPC_REG_STATUS1A_TOGSS_SRC1		0x1
+#define TCPC_REG_STATUS1A_TOGSS_SRC2		0x2
+#define TCPC_REG_STATUS1A_TOGSS_SNK1		0x5
+#define TCPC_REG_STATUS1A_TOGSS_SNK2		0x6
+#define TCPC_REG_STATUS1A_TOGSS_AA		0x7
+#define TCPC_REG_STATUS1A_TOGSS_POS		(3)
+#define TCPC_REG_STATUS1A_TOGSS_MASK		(0x7)
+
+#define TCPC_REG_STATUS1A_RXSOP2DB	(1<<2)
+#define TCPC_REG_STATUS1A_RXSOP1DB	(1<<1)
+#define TCPC_REG_STATUS1A_RXSOP		(1<<0)
+
+#define TCPC_REG_INTERRUPTA	0x3E
+#define TCPC_REG_INTERRUPTA_OCP_TEMP	(1<<7)
+#define TCPC_REG_INTERRUPTA_TOGDONE	(1<<6)
+#define TCPC_REG_INTERRUPTA_SOFTFAIL	(1<<5)
+#define TCPC_REG_INTERRUPTA_RETRYFAIL	(1<<4)
+#define TCPC_REG_INTERRUPTA_HARDSENT	(1<<3)
+#define TCPC_REG_INTERRUPTA_TX_SUCCESS	(1<<2)
+#define TCPC_REG_INTERRUPTA_SOFTRESET	(1<<1)
+#define TCPC_REG_INTERRUPTA_HARDRESET	(1<<0)
+
+#define TCPC_REG_INTERRUPTB	0x3F
+#define TCPC_REG_INTERRUPTB_GCRCSENT		(1<<0)
+
+#define TCPC_REG_STATUS0	0x40
+#define TCPC_REG_STATUS0_VBUSOK		(1<<7)
+#define TCPC_REG_STATUS0_ACTIVITY	(1<<6)
+#define TCPC_REG_STATUS0_COMP		(1<<5)
+#define TCPC_REG_STATUS0_CRC_CHK	(1<<4)
+#define TCPC_REG_STATUS0_ALERT		(1<<3)
+#define TCPC_REG_STATUS0_WAKE		(1<<2)
+#define TCPC_REG_STATUS0_BC_LVL1	(1<<1) /* two-bit field */
+#define TCPC_REG_STATUS0_BC_LVL0	(1<<0) /* two-bit field */
+
+#define TCPC_REG_STATUS1	0x41
+#define TCPC_REG_STATUS1_RXSOP2		(1<<7)
+#define TCPC_REG_STATUS1_RXSOP1		(1<<6)
+#define TCPC_REG_STATUS1_RX_EMPTY	(1<<5)
+#define TCPC_REG_STATUS1_RX_FULL	(1<<4)
+#define TCPC_REG_STATUS1_TX_EMPTY	(1<<3)
+#define TCPC_REG_STATUS1_TX_FULL	(1<<2)
+
+#define TCPC_REG_INTERRUPT	0x42
+#define TCPC_REG_INTERRUPT_VBUSOK	(1<<7)
+#define TCPC_REG_INTERRUPT_ACTIVITY	(1<<6)
+#define TCPC_REG_INTERRUPT_COMP_CHNG	(1<<5)
+#define TCPC_REG_INTERRUPT_CRC_CHK	(1<<4)
+#define TCPC_REG_INTERRUPT_ALERT	(1<<3)
+#define TCPC_REG_INTERRUPT_WAKE		(1<<2)
+#define TCPC_REG_INTERRUPT_COLLISION	(1<<1)
+#define TCPC_REG_INTERRUPT_BC_LVL	(1<<0)
+
+#define TCPC_REG_FIFOS		0x43
+
+/* Tokens defined for the FUSB302 TX FIFO */
+enum fusb302_txfifo_tokens {
+	FUSB302_TKN_TXON = 0xA1,
+	FUSB302_TKN_SYNC1 = 0x12,
+	FUSB302_TKN_SYNC2 = 0x13,
+	FUSB302_TKN_SYNC3 = 0x1B,
+	FUSB302_TKN_RST1 = 0x15,
+	FUSB302_TKN_RST2 = 0x16,
+	FUSB302_TKN_PACKSYM = 0x80,
+	FUSB302_TKN_JAMCRC = 0xFF,
+	FUSB302_TKN_EOP = 0x14,
+	FUSB302_TKN_TXOFF = 0xFE,
+};
+
+/**
+ * Initializes the FUSB302 to operate
+ * as a SNK only.
+ *
+ * @param port  The i2c bus of the FUSB302B
+ *
+ * @returns EC_SUCCESS or EC_XXX on error
+ */
+int init_fusb302b(int port);
+
+/**
+ * Should be called from the interrupt generated
+ * by the FUSB302. This function reads status
+ * and interrupt registers in the FUSB302.
+ */
+int update_status_fusb302b(void);
+
+/**
+ * Returns true if VBUS is present, else false
+ */
+int is_vbus_present(void);
+
+/*
+ * Reads the status of the CC lines
+ *
+ * @returns EC_SUCCESS or EC_XXX on failure
+ */
+int get_cc(int *cc1, int *cc2);
+
+#endif /* __CROS_EC_DRIVER_TCPM_FUSB302_H */