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authorFurquan Shaikh <furquan@google.com>2020-04-19 17:40:22 -0700
committerFurquan Shaikh <furquan@google.com>2020-04-22 19:14:43 +0000
commit38b349cb35738377cf42b71afa9e5d66e1a8eb4b (patch)
tree6d228f8ac3e4a7ab513025c7690088cad3fcedf1 /src/ec/google/chromeec
parent93193a0f09500e4233b6c8466a1ed48b83000a05 (diff)
downloadcoreboot-38b349cb35738377cf42b71afa9e5d66e1a8eb4b.tar.xz
ec/google/chromeec: Add driver for i2c_tunnel device under Chrome EC
This change enables support for generating ACPI nodes for I2C tunnel for any GOOG0012 device that is sitting behind the Chrome EC. It accepts a config "remote_bus" which allows mainboard to configure the id of the remote bus that is being tunneled. BUG=b:154290952 BRANCH=None TEST=Verified that SSDT node for I2C tunnel behind Chrome EC is generated correctly. Signed-off-by: Furquan Shaikh <furquan@google.com> Change-Id: Icfc0ec3725d7f1d20bcb5cb43a0a23aac72bf4eb Reviewed-on: https://review.coreboot.org/c/coreboot/+/40515 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Diffstat (limited to 'src/ec/google/chromeec')
-rw-r--r--src/ec/google/chromeec/Kconfig6
-rw-r--r--src/ec/google/chromeec/Makefile.inc2
-rw-r--r--src/ec/google/chromeec/i2c_tunnel/Kconfig6
-rw-r--r--src/ec/google/chromeec/i2c_tunnel/Makefile.inc1
-rw-r--r--src/ec/google/chromeec/i2c_tunnel/chip.h16
-rw-r--r--src/ec/google/chromeec/i2c_tunnel/i2c_tunnel.c71
6 files changed, 102 insertions, 0 deletions
diff --git a/src/ec/google/chromeec/Kconfig b/src/ec/google/chromeec/Kconfig
index 554677c387..461587800b 100644
--- a/src/ec/google/chromeec/Kconfig
+++ b/src/ec/google/chromeec/Kconfig
@@ -196,3 +196,9 @@ config EC_GOOGLE_CHROMEEC_SWITCHES
help
Enable support for Chrome OS mode switches provided by the Chrome OS
EC.
+
+if EC_GOOGLE_CHROMEEC
+
+source "src/ec/google/chromeec/*/Kconfig"
+
+endif
diff --git a/src/ec/google/chromeec/Makefile.inc b/src/ec/google/chromeec/Makefile.inc
index 590b131355..b11f5c8507 100644
--- a/src/ec/google/chromeec/Makefile.inc
+++ b/src/ec/google/chromeec/Makefile.inc
@@ -1,5 +1,7 @@
ifeq ($(CONFIG_EC_GOOGLE_CHROMEEC),y)
+subdirs-y += i2c_tunnel
+
bootblock-$(CONFIG_EC_GOOGLE_CHROMEEC_BOARDID) += ec_boardid.c
verstage-$(CONFIG_EC_GOOGLE_CHROMEEC_BOARDID) += ec_boardid.c
romstage-$(CONFIG_EC_GOOGLE_CHROMEEC_BOARDID) += ec_boardid.c
diff --git a/src/ec/google/chromeec/i2c_tunnel/Kconfig b/src/ec/google/chromeec/i2c_tunnel/Kconfig
new file mode 100644
index 0000000000..20169fde0f
--- /dev/null
+++ b/src/ec/google/chromeec/i2c_tunnel/Kconfig
@@ -0,0 +1,6 @@
+config EC_GOOGLE_CHROMEEC_I2C_TUNNEL
+ bool
+ depends on HAVE_ACPI_TABLES
+ help
+ This enables the Cros EC I2C tunnel driver that is required to fill the
+ SSDT nodes for the I2C tunnel used by the mainboard.
diff --git a/src/ec/google/chromeec/i2c_tunnel/Makefile.inc b/src/ec/google/chromeec/i2c_tunnel/Makefile.inc
new file mode 100644
index 0000000000..85e0fba127
--- /dev/null
+++ b/src/ec/google/chromeec/i2c_tunnel/Makefile.inc
@@ -0,0 +1 @@
+ramstage-$(CONFIG_EC_GOOGLE_CHROMEEC_I2C_TUNNEL) += i2c_tunnel.c
diff --git a/src/ec/google/chromeec/i2c_tunnel/chip.h b/src/ec/google/chromeec/i2c_tunnel/chip.h
new file mode 100644
index 0000000000..01d52bd0b2
--- /dev/null
+++ b/src/ec/google/chromeec/i2c_tunnel/chip.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* This file is part of the coreboot project. */
+
+#ifndef __EC_GOOGLE_CHROMEEC_I2C_TUNNEL__
+#define __EC_GOOGLE_CHROMEEC_I2C_TUNNEL__
+
+struct ec_google_chromeec_i2c_tunnel_config {
+ /* ACPI device name */
+ const char *name;
+ /* ACPI _UID */
+ unsigned int uid;
+ /* EC I2C bus number we tunnel to on the other side. */
+ unsigned int remote_bus;
+};
+
+#endif /* __EC_GOOGLE_CHROMEEC_I2C_TUNNEL__ */
diff --git a/src/ec/google/chromeec/i2c_tunnel/i2c_tunnel.c b/src/ec/google/chromeec/i2c_tunnel/i2c_tunnel.c
new file mode 100644
index 0000000000..51375f8f22
--- /dev/null
+++ b/src/ec/google/chromeec/i2c_tunnel/i2c_tunnel.c
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* This file is part of the coreboot project. */
+
+#include <arch/acpi_device.h>
+#include <arch/acpigen.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/path.h>
+#include <string.h>
+#include "chip.h"
+
+#define CROS_EC_I2C_TUNNEL_HID "GOOG0012"
+#define CROS_EC_I2C_TUNNEL_DDN "Cros EC I2C Tunnel"
+
+static void crosec_i2c_tunnel_fill_ssdt(struct device *dev)
+{
+ const char *scope = acpi_device_scope(dev);
+ struct ec_google_chromeec_i2c_tunnel_config *cfg = dev->chip_info;
+ struct acpi_dp *dsd;
+
+ if (!dev->enabled || !scope || !cfg)
+ return;
+
+ acpigen_write_scope(scope);
+
+ acpigen_write_device(acpi_device_name(dev));
+ acpigen_write_name_string("_HID", CROS_EC_I2C_TUNNEL_HID);
+ acpigen_write_name_integer("_UID", cfg->uid);
+ acpigen_write_name_string("_DDN", CROS_EC_I2C_TUNNEL_DDN);
+ acpigen_write_STA(acpi_device_status(dev));
+
+ dsd = acpi_dp_new_table("_DSD");
+ acpi_dp_add_integer(dsd, "google,remote-bus", cfg->remote_bus);
+ acpi_dp_write(dsd);
+
+ acpigen_pop_len(); /* Device */
+ acpigen_pop_len(); /* Scope */
+
+ printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev), CROS_EC_I2C_TUNNEL_DDN,
+ dev_path(dev));
+}
+
+static const char *crosec_i2c_tunnel_acpi_name(const struct device *dev)
+{
+ struct ec_google_chromeec_i2c_tunnel_config *cfg = dev->chip_info;
+ static char name[5];
+
+ if (cfg->name)
+ return cfg->name;
+
+ snprintf(name, sizeof(name), "TUN%X", dev->path.generic.id);
+ return name;
+}
+
+static struct device_operations crosec_i2c_tunnel_ops = {
+ .read_resources = noop_read_resources,
+ .set_resources = noop_set_resources,
+ .acpi_name = crosec_i2c_tunnel_acpi_name,
+ .acpi_fill_ssdt = crosec_i2c_tunnel_fill_ssdt,
+ .scan_bus = scan_static_bus,
+};
+
+static void crosec_i2c_tunnel_enable(struct device *dev)
+{
+ dev->ops = &crosec_i2c_tunnel_ops;
+}
+
+struct chip_operations ec_google_chromeec_i2c_tunnel_ops = {
+ CHIP_NAME("CrosEC I2C Tunnel Device")
+ .enable_dev = crosec_i2c_tunnel_enable
+};