tcpm: Add tpcm driver for stm32gx chips

This CL adds tcpm driver for the STM32Gx family of chips which have a
ucpd peripheral for its on-chip type-c/usb-pd block. Ah this phase of
development, only the methods required for type-c operation are
implemented.

BUG=b:167601672
BRANCH=None
TEST=verfied type-c attaches properly on quiche

Signed-off-by: Scott Collyer <scollyer@google.com>
Change-Id: Ia23eb4e346682ab3a9f8c7da2b5519c330b67936
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2206155
Commit-Queue: Scott Collyer <scollyer@chromium.org>
Tested-by: Scott Collyer <scollyer@chromium.org>
Reviewed-by: Diana Z <dzigterman@chromium.org>

4 files changed, 166 insertions, 0 deletions

diff --git a/driver/build.mk b/driver/build.mk
index 5b1f89605a..5d4f92e6be 100644
--- a/driver/build.mk
+++ b/driver/build.mk
@@ -148,6 +148,7 @@ driver-$(CONFIG_USB_PD_TCPM_RT1715)+=tcpm/rt1715.o
 driver-$(CONFIG_USB_PD_TCPM_NCT38XX)+=tcpm/nct38xx.o
 driver-$(CONFIG_USB_PD_TCPM_RAA489000)+=tcpm/raa489000.o
 driver-$(CONFIG_USB_PD_TCPM_FUSB307)+=tcpm/fusb307.o
+driver-$(CONFIG_USB_PD_TCPM_STM32GX)+=tcpm/stm32gx.o
 
 # Type-C Retimer drivers
 driver-$(CONFIG_USBC_RETIMER_INTEL_BB)+=retimer/bb_retimer.o
diff --git a/driver/tcpm/stm32gx.c b/driver/tcpm/stm32gx.c
new file mode 100644
index 0000000000..88109329dc
--- /dev/null
+++ b/driver/tcpm/stm32gx.c
@@ -0,0 +1,150 @@
+/* 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.
+ */
+
+/* TCPM for STM32Gx UCPD module */
+
+#include "chip/stm32/ucpd-stm32gx.h"
+#include "common.h"
+#include "config.h"
+#include "console.h"
+#include "registers.h"
+#include "stm32gx.h"
+#include "system.h"
+#include "task.h"
+#include "tcpci.h"
+#include "timer.h"
+#include "util.h"
+#include "usb_pd.h"
+#include "usb_pd_tcpm.h"
+#include "hooks.h"
+
+#if defined(CONFIG_USB_PD_VBUS_DETECT_TCPC) || \
+	defined(CONFIG_USB_PD_TCPC_LOW_POWER)
+#error "Unsupported config options of Stm32gx PD driver"
+#endif
+
+/* Wait time for vconn power switch to turn off. */
+#ifndef PD_STM32GX_VCONN_TURN_OFF_DELAY_US
+#define PD_STM32GX_VCONN_TURN_OFF_DELAY_US 500
+#endif
+
+static int cached_rp[CONFIG_USB_PD_PORT_MAX_COUNT];
+
+
+static int stm32gx_tcpm_get_message_raw(int port, uint32_t *buf, int *head)
+{
+	/* TODO(b/167601672): Need to implement this for USB-PD support */
+	return EC_SUCCESS;
+}
+
+static int stm32gx_tcpm_init(int port)
+{
+	return stm32gx_ucpd_init(port);
+}
+
+static int stm32gx_tcpm_release(int port)
+{
+	return stm32gx_ucpd_release(port);
+}
+
+static int stm32gx_tcpm_get_cc(int port, enum tcpc_cc_voltage_status *cc1,
+	enum tcpc_cc_voltage_status *cc2)
+{
+	/* Get cc_state value for each CC line */
+	stm32gx_ucpd_get_cc(port, cc1, cc2);
+
+	return EC_SUCCESS;
+}
+
+static int stm32gx_tcpm_select_rp_value(int port, int rp_sel)
+{
+	cached_rp[port] = rp_sel;
+
+	return EC_SUCCESS;
+}
+
+static int stm32gx_tcpm_set_cc(int port, int pull)
+{
+	return stm32gx_ucpd_set_cc(port, pull, cached_rp[port]);
+}
+
+static int stm32gx_tcpm_set_polarity(int port, enum tcpc_cc_polarity polarity)
+{
+	return stm32gx_ucpd_set_polarity(port, polarity);
+}
+
+static int stm32gx_tcpm_set_vconn(int port, int enable)
+{
+	/*
+	 * TODO(b/167601672): VCONN is not provided by ucpd peripheral, so the
+	 * only action required here will be to remove Rp from the CC line that
+	 * is supplying VCONN.
+	 */
+	return EC_SUCCESS;
+}
+
+static int stm32gx_tcpm_set_msg_header(int port, int power_role, int data_role)
+{
+	/* TODO(b/167601672): Need to implement this for USB-PD support */
+	return EC_SUCCESS;
+}
+
+static int stm32gx_tcpm_set_rx_enable(int port, int enable)
+{
+	/* TODO(b/167601672): Need to implement this for USB-PD support */
+	return EC_SUCCESS;
+}
+
+static int stm32gx_tcpm_transmit(int port,
+			enum tcpm_transmit_type type,
+			uint16_t header,
+			const uint32_t *data)
+{
+	/* TODO(b/167601672): Need to implement this for USB-PD support */
+	return EC_SUCCESS;
+}
+
+static int stm32gx_tcpm_sop_prime_disable(int port)
+{
+	/* TODO(b/167601672): Need to implement this for USB-PD support */
+	return EC_SUCCESS;
+}
+
+
+static int stm32gx_tcpm_get_chip_info(int port, int live,
+			struct ec_response_pd_chip_info_v1 *chip_info)
+{
+	/* TODO(b/167601672): Need to implement this for USB-PD support */
+	return EC_SUCCESS;
+}
+
+static void stm32gx_tcpm_sw_reset(void)
+{
+	/*
+	 * TODO(b/167601672): Not sure if this hook is required for UCPD as
+	 * opposed to TCPCI compliant TCPC. Leaving this a placeholder so I
+	 * don't forget to pull this back in, if required.
+	 */
+}
+DECLARE_HOOK(HOOK_USB_PD_DISCONNECT, stm32gx_tcpm_sw_reset, HOOK_PRIO_DEFAULT);
+
+const struct tcpm_drv stm32gx_tcpm_drv = {
+	.init			= &stm32gx_tcpm_init,
+	.release		= &stm32gx_tcpm_release,
+	.get_cc			= &stm32gx_tcpm_get_cc,
+	.select_rp_value	= &stm32gx_tcpm_select_rp_value,
+	.set_cc			= &stm32gx_tcpm_set_cc,
+	.set_polarity		= &stm32gx_tcpm_set_polarity,
+#ifdef CONFIG_USB_PD_DECODE_SOP
+       .sop_prime_disable      = &stm32gx_tcpm_sop_prime_disable,
+#endif
+
+	.set_vconn		= &stm32gx_tcpm_set_vconn,
+	.set_msg_header		= &stm32gx_tcpm_set_msg_header,
+	.set_rx_enable		= &stm32gx_tcpm_set_rx_enable,
+	.get_message_raw	= &stm32gx_tcpm_get_message_raw,
+	.transmit		= &stm32gx_tcpm_transmit,
+	.get_chip_info		= &stm32gx_tcpm_get_chip_info,
+};
diff --git a/driver/tcpm/stm32gx.h b/driver/tcpm/stm32gx.h
new file mode 100644
index 0000000000..de6a803d52
--- /dev/null
+++ b/driver/tcpm/stm32gx.h
@@ -0,0 +1,14 @@
+/* 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 */
+#ifndef __CROS_EC_DRIVER_TCPM_STM32GX_H
+#define __CROS_EC_DRIVER_TCPM_STM32GX_H
+
+
+extern const struct tcpm_drv stm32gx_tcpm_drv;
+
+
+#endif /* __CROS_EC_DRIVER_TCPM_STM32GX_H */
diff --git a/include/config.h b/include/config.h
index 0e343ec419..ab713c7a5d 100644
--- a/include/config.h
+++ b/include/config.h
@@ -4146,6 +4146,7 @@
 #undef CONFIG_USB_PD_TCPM_RAA489000
 #undef CONFIG_USB_PD_TCPM_RT1715
 #undef CONFIG_USB_PD_TCPM_FUSB307
+#undef CONFIG_USB_PD_TCPM_STM32GX
 
 /* PS8XXX series are all supported by a single driver with a build time config
  * listed below (CONFIG_USB_PD_TCPM_PS*) defined to enable the specific product.