ec/google/chromeec: Add EC Mux device
Introduce an EC Mux ACPI device, which will control retimer and discrete
(off-AP) mux configuration.
BUG=b:208883648
TEST=None
BRANCH=None
Change-Id: Ia2022810292783583ee5f09ce29a63b96686dbb8
Signed-off-by: Prashant Malani <pmalani@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63792
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
diff --git a/src/ec/google/chromeec/Makefile.inc b/src/ec/google/chromeec/Makefile.inc
index 23e7b3d..f6c53d3 100644
--- a/src/ec/google/chromeec/Makefile.inc
+++ b/src/ec/google/chromeec/Makefile.inc
@@ -2,6 +2,7 @@
subdirs-y += audio_codec
subdirs-y += i2c_tunnel
+subdirs-y += mux
bootblock-$(CONFIG_EC_GOOGLE_CHROMEEC_BOARDID) += ec_boardid.c
verstage-$(CONFIG_EC_GOOGLE_CHROMEEC_BOARDID) += ec_boardid.c
diff --git a/src/ec/google/chromeec/mux/Kconfig b/src/ec/google/chromeec/mux/Kconfig
new file mode 100644
index 0000000..654ff82
--- /dev/null
+++ b/src/ec/google/chromeec/mux/Kconfig
@@ -0,0 +1,11 @@
+if EC_GOOGLE_CHROMEEC
+
+config EC_GOOGLE_CHROMEEC_MUX
+ bool
+ depends on HAVE_ACPI_TABLES
+ help
+ This enables the Cros EC Mux driver that is required to fill the
+ SSDT nodes for the EC Mux platform device which is used to
+ configure Type C muxes and retimers.
+
+endif
diff --git a/src/ec/google/chromeec/mux/Makefile.inc b/src/ec/google/chromeec/mux/Makefile.inc
new file mode 100644
index 0000000..c4cef75
--- /dev/null
+++ b/src/ec/google/chromeec/mux/Makefile.inc
@@ -0,0 +1,2 @@
+subdirs-y += conn
+ramstage-$(CONFIG_EC_GOOGLE_CHROMEEC_MUX) += mux.c
diff --git a/src/ec/google/chromeec/mux/conn/Makefile.inc b/src/ec/google/chromeec/mux/conn/Makefile.inc
new file mode 100644
index 0000000..1f837ca
--- /dev/null
+++ b/src/ec/google/chromeec/mux/conn/Makefile.inc
@@ -0,0 +1 @@
+ramstage-$(CONFIG_EC_GOOGLE_CHROMEEC_MUX) += conn.c
diff --git a/src/ec/google/chromeec/mux/conn/conn.c b/src/ec/google/chromeec/mux/conn/conn.c
new file mode 100644
index 0000000..43f5595
--- /dev/null
+++ b/src/ec/google/chromeec/mux/conn/conn.c
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <acpi/acpigen.h>
+
+static const char *conn_acpi_name(const struct device *dev)
+{
+ static char name[5];
+ snprintf(name, sizeof(name), "CON%1X", dev->path.generic.id);
+ return name;
+}
+
+static void conn_fill_ssdt(const struct device *dev)
+{
+ const char *name;
+ name = acpi_device_name(dev);
+ if (!name)
+ return;
+
+ acpigen_write_scope(acpi_device_scope(dev));
+ acpigen_write_device(name);
+
+ acpigen_write_name_integer("_ADR", dev->path.generic.id);
+
+ acpigen_write_device_end();
+ acpigen_write_scope_end();
+}
+
+static struct device_operations conn_dev_ops = {
+ .read_resources = noop_read_resources,
+ .set_resources = noop_set_resources,
+ .acpi_name = conn_acpi_name,
+ .acpi_fill_ssdt = conn_fill_ssdt,
+};
+
+static void conn_enable(struct device *dev)
+{
+ dev->ops = &conn_dev_ops;
+}
+
+struct chip_operations ec_google_chromeec_mux_conn_ops = {
+ CHIP_NAME("CrosEC Type C Mux device")
+ .enable_dev = conn_enable,
+};
diff --git a/src/ec/google/chromeec/mux/mux.c b/src/ec/google/chromeec/mux/mux.c
new file mode 100644
index 0000000..9324d2e
--- /dev/null
+++ b/src/ec/google/chromeec/mux/mux.c
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <acpi/acpigen.h>
+
+#define GOOGLE_CHROMEEC_MUX_DEVICE_HID "GOOG001A"
+#define GOOGLE_CHROMEEC_MUX_DEVICE_NAME "ECMX"
+
+static void mux_fill_ssdt(const struct device *dev)
+{
+ acpigen_write_scope(acpi_device_scope(dev));
+ acpigen_write_device(GOOGLE_CHROMEEC_MUX_DEVICE_NAME);
+ acpigen_write_name_string("_HID", GOOGLE_CHROMEEC_MUX_DEVICE_HID);
+ acpigen_write_name_string("_DDN", "ChromeOS EC Embedded Controller "
+ "Mux & Retimer control");
+
+ acpigen_write_device_end();
+ acpigen_write_scope_end();
+}
+
+static const char *mux_acpi_name(const struct device *dev)
+{
+ return GOOGLE_CHROMEEC_MUX_DEVICE_NAME;
+}
+
+static struct device_operations mux_ops = {
+ .read_resources = noop_read_resources,
+ .set_resources = noop_set_resources,
+ .acpi_name = mux_acpi_name,
+ .acpi_fill_ssdt = mux_fill_ssdt,
+ .scan_bus = scan_static_bus,
+};
+
+static void mux_enable(struct device *dev)
+{
+ dev->ops = &mux_ops;
+}
+
+struct chip_operations ec_google_chromeec_mux_ops = {
+ CHIP_NAME("CrosEC Type C Mux device")
+ .enable_dev = mux_enable
+};