tcpc: Add driver for TI TUSB422 tcpc

Initial driver for TUSB422 TCPC which is a tcpci compliant TCPC. This
TCPC does not inlude a Type C mux and uses the tcpci driver for all of
the methods.

BUG=b:111281797
BRANCH=none
TEST=Verified operation as sink on DragonEgg. Have not verified source
operation, or low power/auto-toggle modes as those config options
can't be enabled on ITE at this point.

Change-Id: I783a5e2c4a13bc0b8fa4da4b134588382542024c
Signed-off-by: Scott Collyer <scollyer@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1178994
Commit-Ready: Jett Rink <jettrink@chromium.org>
Tested-by: Jett Rink <jettrink@chromium.org>
Reviewed-by: Jett Rink <jettrink@chromium.org>

4 files changed, 84 insertions, 0 deletions

diff --git a/driver/build.mk b/driver/build.mk
index f95d80748d..74bf4c573a 100644
--- a/driver/build.mk
+++ b/driver/build.mk
@@ -113,6 +113,7 @@ driver-$(CONFIG_USB_PD_TCPM_ANX7688)+=tcpm/anx7688.o
 driver-$(CONFIG_USB_PD_TCPM_ANX7447)+=tcpm/anx7447.o
 driver-$(CONFIG_USB_PD_TCPM_PS8751)+=tcpm/ps8xxx.o
 driver-$(CONFIG_USB_PD_TCPM_PS8805)+=tcpm/ps8xxx.o
+driver-$(CONFIG_USB_PD_TCPM_TUSB422)+=tcpm/tusb422.o
 
 # USB mux high-level driver
 driver-$(CONFIG_USBC_SS_MUX)+=usb_mux.o
diff --git a/driver/tcpm/tusb422.c b/driver/tcpm/tusb422.c
new file mode 100644
index 0000000000..0e6a6c51d5
--- /dev/null
+++ b/driver/tcpm/tusb422.c
@@ -0,0 +1,66 @@
+/* Copyright 2018 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.
+ */
+
+/* Type-C port manager for TI TUSB422 Port Controller */
+
+#include "common.h"
+#include "tusb422.h"
+#include "tcpci.h"
+#include "tcpm.h"
+#include "timer.h"
+#include "usb_pd.h"
+
+#ifndef CONFIG_USB_PD_TCPM_TCPCI
+#error "TUSB422 is using a standard TCPCI interface"
+#error "Please upgrade your board configuration"
+
+#endif
+
+int tusb422_tcpci_tcpn_init(int port)
+{
+	int rv = tcpci_tcpm_init(port);
+
+	if (rv)
+		return rv;
+
+	/*
+	 * VBUS detection is supposed to be enabled by default, however the
+	 * TUSB422 has this disabled following reset.
+	 */
+	/* Enable VBUS detection */
+	return tcpc_write16(port, TCPC_REG_COMMAND, 0x33);
+}
+
+const struct tcpm_drv tusb422_tcpm_drv = {
+	.init			= &tusb422_tcpci_tcpn_init,
+	.release		= &tcpci_tcpm_release,
+	.get_cc			= &tcpci_tcpm_get_cc,
+#ifdef CONFIG_USB_PD_VBUS_DETECT_TCPC
+	.get_vbus_level		= &tcpci_tcpm_get_vbus_level,
+#endif
+	.select_rp_value	= &tcpci_tcpm_select_rp_value,
+	.set_cc			= &tcpci_tcpm_set_cc,
+	.set_polarity		= &tcpci_tcpm_set_polarity,
+	.set_vconn		= &tcpci_tcpm_set_vconn,
+	.set_msg_header		= &tcpci_tcpm_set_msg_header,
+	.set_rx_enable		= &tcpci_tcpm_set_rx_enable,
+	.get_message_raw	= &tcpci_tcpm_get_message_raw,
+	.transmit		= &tcpci_tcpm_transmit,
+	.tcpc_alert		= &tcpci_tcpc_alert,
+#ifdef CONFIG_USB_PD_DISCHARGE_TCPC
+	.tcpc_discharge_vbus	= &tcpci_tcpc_discharge_vbus,
+#endif
+#ifdef CONFIG_USB_PD_DUAL_ROLE_AUTO_TOGGLE
+	.drp_toggle		= &tcpci_tcpc_drp_toggle,
+#endif
+#ifdef CONFIG_USBC_PPC
+	.set_snk_ctrl		= &tcpci_tcpm_set_snk_ctrl,
+	.set_src_ctrl		= &tcpci_tcpm_set_src_ctrl,
+#endif
+	.get_chip_info		= &tcpci_get_chip_info,
+#ifdef CONFIG_USB_PD_TCPC_LOW_POWER
+	.enter_low_power_mode	= &tcpci_enter_low_power_mode,
+#endif
+};
diff --git a/driver/tcpm/tusb422.h b/driver/tcpm/tusb422.h
new file mode 100644
index 0000000000..2a01eb4725
--- /dev/null
+++ b/driver/tcpm/tusb422.h
@@ -0,0 +1,16 @@
+/* Copyright 2018 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.
+ */
+
+/* TI TUSB422 Type-C port controller */
+
+#ifndef __CROS_EC_USB_PD_TCPM_TUSB422_H
+#define __CROS_EC_USB_PD_TCPM_TUSB422_H
+
+/* I2C interface */
+#define TUSB422_I2C_ADDR 0x40
+
+extern const struct tcpm_drv tusb422_tcpm_drv;
+
+#endif /* defined(__CROS_EC_USB_PD_TCPM_TUSB422_H) */
diff --git a/include/config.h b/include/config.h
index 429339654a..82ba112171 100644
--- a/include/config.h
+++ b/include/config.h
@@ -3190,6 +3190,7 @@
 #undef CONFIG_USB_PD_TCPM_PS8751
 #undef CONFIG_USB_PD_TCPM_PS8805
 #undef CONFIG_USB_PD_TCPM_MT6370
+#undef CONFIG_USB_PD_TCPM_TUSB422
 
 /*
  * Adds an EC console command to erase the ANX7447 OCM flash.