ppc: Create generic PPC driver framework.

This commit introduces a driver framework for power path controllers.
It provides some common PPC APIs as well as allowing a board to use
multiple different PPCs drivers/parts.  This should make it easier to
add PPC drivers in the future.

BUG=None
BRANCH=None
TEST=`make -j buildall`
TEST=Flash zoombini; verify PPC works as expected.
TEST=Flash meowth; verify PPC works as expected.

Change-Id: Icfb99f384610590b431456cfd28d4aff18442cb2
Signed-off-by: Aseda Aboagye <aaboagye@google.com>
Reviewed-on: https://chromium-review.googlesource.com/807630
Commit-Ready: Aseda Aboagye <aaboagye@chromium.org>
Tested-by: Aseda Aboagye <aaboagye@chromium.org>
Reviewed-by: Edward Hill <ecgh@chromium.org>
Reviewed-by: Shawn N <shawnn@chromium.org>

1 files changed, 76 insertions, 0 deletions

diff --git a/common/usbc_ppc.c b/common/usbc_ppc.c
new file mode 100644
index 0000000000..5d41619a79
--- /dev/null
+++ b/common/usbc_ppc.c
@@ -0,0 +1,76 @@
+/* Copyright 2017 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-C Power Path Controller Common Code */
+
+#include "common.h"
+#include "console.h"
+#include "hooks.h"
+#include "usbc_ppc.h"
+#include "util.h"
+
+#define CPRINTF(format, args...) cprintf(CC_USBPD, format, ## args)
+#define CPRINTS(format, args...) cprints(CC_USBPD, format, ## args)
+
+/* Simple wrappers to dispatch to the drivers. */
+
+int ppc_is_sourcing_vbus(int port)
+{
+	if ((port < 0) || (port >= ppc_cnt)) {
+		CPRINTS("%s(%d) Invalid port!", __func__, port);
+		return 0;
+	}
+
+	return ppc_chips[port].drv->is_sourcing_vbus(port);
+}
+
+int ppc_vbus_sink_enable(int port, int enable)
+{
+	if ((port < 0) || (port >= ppc_cnt))
+		return EC_ERROR_INVAL;
+
+	return ppc_chips[port].drv->vbus_sink_enable(port, enable);
+}
+
+int ppc_vbus_source_enable(int port, int enable)
+{
+	if ((port < 0) || (port >= ppc_cnt))
+		return EC_ERROR_INVAL;
+
+	return ppc_chips[port].drv->vbus_source_enable(port, enable);
+}
+
+static void ppc_init(void)
+{
+	int i;
+	int rv;
+
+	for (i = 0; i < ppc_cnt; i++) {
+		rv = ppc_chips[i].drv->init(i);
+		if (rv)
+			CPRINTS("p%d: PPC init failed! (%d)", i, rv);
+		else
+			CPRINTS("p%d: PPC init'd.", i);
+	}
+}
+DECLARE_HOOK(HOOK_INIT, ppc_init, HOOK_PRIO_INIT_I2C + 1);
+
+#ifdef CONFIG_CMD_PPC_DUMP
+static int command_ppc_dump(int argc, char **argv)
+{
+	int port;
+
+	if (argc < 2)
+		return EC_ERROR_PARAM_COUNT;
+
+	port = atoi(argv[1]);
+	if (port >= ppc_cnt)
+		return EC_ERROR_PARAM1;
+
+	return ppc_chips[port].drv->reg_dump(port);
+}
+DECLARE_CONSOLE_COMMAND(ppc_dump, command_ppc_dump, "<Type-C port>",
+			"dump the PPC regs");
+#endif /* defined(CONFIG_CMD_PPC_DUMP) */