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authorFurquan Shaikh <furquan@chromium.org>2016-12-12 09:30:42 -0800
committerMartin Roth <martinroth@google.com>2016-12-17 04:21:19 +0100
commit60f3217ed9a91bcf96a49af83fac3dcbaf54aa88 (patch)
tree6837e781960e7fc91bd7b98dcb4a0f3b3aba558d /src/drivers/generic
parent690831d148edd04da14204211cb1c83cb12b1ba6 (diff)
downloadcoreboot-60f3217ed9a91bcf96a49af83fac3dcbaf54aa88.tar.xz
drivers/regulator: Add driver for handling GPIO-based fixed regulator
This change adds the required device node in SSDT for defining GPIO-based fixed voltage regulator. BUG=chrome-os-partner:60194 BRANCH=None TEST=Verified that ELAN touchscreen works with exported GPIOs and ACPI regulator. Change-Id: I4380aea0929fb7e81dbe83f940e3e51e983819f9 Signed-off-by: Furquan Shaikh <furquan@chromium.org> Reviewed-on: https://review.coreboot.org/17798 Tested-by: build bot (Jenkins) Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Diffstat (limited to 'src/drivers/generic')
-rw-r--r--src/drivers/generic/gpio_regulator/Kconfig18
-rw-r--r--src/drivers/generic/gpio_regulator/Makefile.inc16
-rw-r--r--src/drivers/generic/gpio_regulator/chip.h27
-rw-r--r--src/drivers/generic/gpio_regulator/gpio_regulator.c90
4 files changed, 151 insertions, 0 deletions
diff --git a/src/drivers/generic/gpio_regulator/Kconfig b/src/drivers/generic/gpio_regulator/Kconfig
new file mode 100644
index 0000000000..12ab3cb223
--- /dev/null
+++ b/src/drivers/generic/gpio_regulator/Kconfig
@@ -0,0 +1,18 @@
+#
+# This file is part of the coreboot project.
+#
+# Copyright 2016 Google Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+
+config DRIVERS_GENERIC_GPIO_REGULATOR
+ bool
+ depends on HAVE_ACPI_TABLES
diff --git a/src/drivers/generic/gpio_regulator/Makefile.inc b/src/drivers/generic/gpio_regulator/Makefile.inc
new file mode 100644
index 0000000000..845b19105a
--- /dev/null
+++ b/src/drivers/generic/gpio_regulator/Makefile.inc
@@ -0,0 +1,16 @@
+#
+# This file is part of the coreboot project.
+#
+# Copyright 2016 Google Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+
+ramstage-$(CONFIG_DRIVERS_GENERIC_GPIO_REGULATOR) += gpio_regulator.c
diff --git a/src/drivers/generic/gpio_regulator/chip.h b/src/drivers/generic/gpio_regulator/chip.h
new file mode 100644
index 0000000000..8d655ef6e5
--- /dev/null
+++ b/src/drivers/generic/gpio_regulator/chip.h
@@ -0,0 +1,27 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2016 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __DRIVERS_GENERIC_GPIO_REGULATOR_H__
+#define __DRIVERS_GENERIC_GPIO_REGULATOR_H__
+
+#include <arch/acpi_device.h>
+
+struct drivers_generic_gpio_regulator_config {
+ const char *name;
+ struct acpi_gpio gpio;
+ bool enabled_on_boot;
+};
+
+#endif /* __DRIVERS_GENERIC_GPIO_REGULATOR_H__ */
diff --git a/src/drivers/generic/gpio_regulator/gpio_regulator.c b/src/drivers/generic/gpio_regulator/gpio_regulator.c
new file mode 100644
index 0000000000..def174486c
--- /dev/null
+++ b/src/drivers/generic/gpio_regulator/gpio_regulator.c
@@ -0,0 +1,90 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2016 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#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"
+
+static void gpio_regulator_fill_ssdt_generator(struct device *dev)
+{
+ struct drivers_generic_gpio_regulator_config *config = dev->chip_info;
+ const char *scope = acpi_device_scope(dev);
+ const char *path = acpi_device_path(dev);
+ struct acpi_dp *dsd;
+
+ if (!dev->enabled || !scope || !path || !config->gpio.pin_count)
+ return;
+
+ /* Device */
+ acpigen_write_scope(scope);
+ acpigen_write_device(acpi_device_name(dev));
+
+ /* _HID is set to PRP0001 */
+ acpigen_write_name_string("_HID", ACPI_DT_NAMESPACE_HID);
+
+ /* Resources - _CRS */
+ acpigen_write_name("_CRS");
+ acpigen_write_resourcetemplate_header();
+ acpi_device_write_gpio(&config->gpio);
+ acpigen_write_resourcetemplate_footer();
+
+ /* DSD */
+ dsd = acpi_dp_new_table("_DSD");
+ acpi_dp_add_string(dsd, "compatible", "regulator-fixed");
+ acpi_dp_add_string(dsd, "regulator-name", config->name);
+ acpi_dp_add_gpio(dsd, "gpio-gpios", path, 0, 0, config->gpio.polarity);
+ if (config->enabled_on_boot)
+ acpi_dp_add_string(dsd, "regulator-boot-on", "on");
+ if (config->gpio.polarity == ACPI_GPIO_ACTIVE_HIGH)
+ acpi_dp_add_string(dsd, "enable-active-high", "on");
+ acpi_dp_write(dsd);
+
+ acpigen_pop_len(); /* Device */
+ acpigen_pop_len(); /* Scope */
+}
+
+static const char *gpio_regulator_acpi_name(struct device *dev)
+{
+ struct drivers_generic_gpio_regulator_config *config = dev->chip_info;
+ static char name[5];
+
+ snprintf(name, sizeof(name), "R%03.3X", config->gpio.pins[0]);
+ name[4] = '\0';
+
+ return name;
+}
+
+static struct device_operations gpio_regulator_ops = {
+ .read_resources = DEVICE_NOOP,
+ .set_resources = DEVICE_NOOP,
+ .enable_resources = DEVICE_NOOP,
+ .acpi_name = &gpio_regulator_acpi_name,
+ .acpi_fill_ssdt_generator = &gpio_regulator_fill_ssdt_generator,
+};
+
+static void gpio_regulator_enable(struct device *dev)
+{
+ dev->ops = &gpio_regulator_ops;
+}
+
+struct chip_operations drivers_generic_gpio_regulator_ops = {
+ CHIP_NAME("GPIO Regulator")
+ .enable_dev = &gpio_regulator_enable
+};