ppc: add AOZ1380 driver

BUG=b:138599218
BRANCH=none
TEST=make buildall -j

Change-Id: Ib06053b2129623683fece8a63ee182d52cb07422
Signed-off-by: Denis Brockus <dbrockus@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1833922
Reviewed-by: Edward Hill <ecgh@chromium.org>

2 files changed, 159 insertions, 0 deletions

diff --git a/driver/ppc/aoz1380.c b/driver/ppc/aoz1380.c
new file mode 100644
index 0000000000..8ac81daed3
--- /dev/null
+++ b/driver/ppc/aoz1380.c
@@ -0,0 +1,115 @@
+/* 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.
+ */
+
+/*
+ * AOZ1380 USB-C Power Path Controller
+ *
+ * This is a basic TCPM controlled PPC driver.  It could easily be
+ * renamed and repurposed to be generic, if there are other TCPM
+ * controlled PPC chips that are similar to the AOZ1380
+ */
+
+#include "common.h"
+#include "console.h"
+#include "driver/ppc/aoz1380.h"
+#include "hooks.h"
+#include "system.h"
+#include "tcpm.h"
+#include "usb_pd.h"
+#include "usb_pd_tcpc.h"
+#include "usbc_ppc.h"
+
+#define CPRINTF(format, args...) cprintf(CC_USBPD, format, ## args)
+#define CPRINTS(format, args...) cprints(CC_USBPD, format, ## args)
+
+static uint32_t irq_pending; /* Bitmask of ports signaling an interrupt. */
+
+#define AOZ1380_FLAGS_SOURCE_ENABLED    BIT(0)
+static uint8_t flags[CONFIG_USB_PD_PORT_COUNT];
+
+static int aoz1380_init(int port)
+{
+	flags[port] = 0;
+
+	return EC_SUCCESS;
+}
+
+static int aoz1380_vbus_sink_enable(int port, int enable)
+{
+	int rv;
+
+	rv = tcpm_set_snk_ctrl(port, enable);
+
+	return rv;
+}
+
+static int aoz1380_vbus_source_enable(int port, int enable)
+{
+	int rv;
+
+	rv = tcpm_set_src_ctrl(port, enable);
+	if (rv)
+		return rv;
+
+	if (enable)
+		flags[port] |= AOZ1380_FLAGS_SOURCE_ENABLED;
+	else
+		flags[port] &= ~AOZ1380_FLAGS_SOURCE_ENABLED;
+
+	return rv;
+}
+
+static int aoz1380_is_sourcing_vbus(int port)
+{
+	return flags[port] & AOZ1380_FLAGS_SOURCE_ENABLED;
+}
+
+static int aoz1380_set_vbus_source_current_limit(int port,
+						 enum tcpc_rp_value rp)
+{
+	return board_aoz1380_set_vbus_source_current_limit(port, rp);
+}
+
+/*
+ * AOZ1380 Interrupt Handler
+ *
+ * This device only has a single over current/temperature interrupt.
+ * TODO(b/141939343) Determine how to clear the interrupt
+ * TODO(b/142076004) Test this to verify we shut off vbus current
+ */
+static void aoz1380_handle_interrupt(int port)
+{
+	/*
+	 * This is a over current/temperature condition
+	 */
+	CPRINTS("C%d: PPC detected Vbus overcurrent/temperature!", port);
+	pd_handle_overcurrent(port);
+}
+
+static void aoz1380_irq_deferred(void)
+{
+	int i;
+	uint32_t pending = atomic_read_clear(&irq_pending);
+
+	for (i = 0; i < CONFIG_USB_PD_PORT_COUNT; i++)
+		if (BIT(i) & pending)
+			aoz1380_handle_interrupt(i);
+}
+DECLARE_DEFERRED(aoz1380_irq_deferred);
+
+void aoz1380_interrupt(int port)
+{
+	atomic_or(&irq_pending, BIT(port));
+	hook_call_deferred(&aoz1380_irq_deferred_data, 0);
+}
+
+const struct ppc_drv aoz1380_drv = {
+	.init = &aoz1380_init,
+	.is_sourcing_vbus = &aoz1380_is_sourcing_vbus,
+	.vbus_sink_enable = &aoz1380_vbus_sink_enable,
+	.vbus_source_enable = &aoz1380_vbus_source_enable,
+	.set_vbus_source_current_limit =
+		&aoz1380_set_vbus_source_current_limit,
+};
diff --git a/driver/ppc/aoz1380.h b/driver/ppc/aoz1380.h
new file mode 100644
index 0000000000..672be8eb75
--- /dev/null
+++ b/driver/ppc/aoz1380.h
@@ -0,0 +1,44 @@
+/* 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.
+ */
+
+/*
+ * AOZ1380 USB-C Power Path Controller
+ *
+ * This is a basic TCPM controlled PPC driver.  It could easily be
+ * renamed and repurposed to be generic, if there are other TCPM
+ * controlled PPC chips that are similar to the AOZ1380
+ */
+
+#ifndef __CROS_EC_AOZ1380_H
+#define __CROS_EC_AOZ1380_H
+
+#include "usb_pd_tcpm.h"
+
+/**
+ * AOZ1380 Set VBus Source Current Limit.
+ *
+ * Using this driver requires a board_aoz1380_set_vbus_source_limit
+ * function due to the lack of programability of this device and
+ * requirement for hardware specific code to handle setting this limit.
+ *
+ * @param port The Type-C port
+ * @param rp The Type-C RP value
+ * @return EC_SUCCESS for success, otherwise error
+ */
+int board_aoz1380_set_vbus_source_current_limit(int port,
+						enum tcpc_rp_value rp);
+
+
+struct ppc_drv;
+extern const struct ppc_drv aoz1380_drv;
+
+/**
+ * Interrupt Handler for the AOZ1380.
+ *
+ * @param port: The Type-C port which triggered the interrupt.
+ */
+void aoz1380_interrupt(int port);
+
+#endif /* defined(__CROS_EC_AOZ1380_H) */