diff options
| -rw-r--r-- | src/drivers/i2c/max98927/Kconfig | 4 | ||||
| -rw-r--r-- | src/drivers/i2c/max98927/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/drivers/i2c/max98927/chip.h | 30 | ||||
| -rw-r--r-- | src/drivers/i2c/max98927/max98927.c | 100 |
4 files changed, 135 insertions, 0 deletions
diff --git a/src/drivers/i2c/max98927/Kconfig b/src/drivers/i2c/max98927/Kconfig new file mode 100644 index 0000000000..b193c6ed09 --- /dev/null +++ b/src/drivers/i2c/max98927/Kconfig @@ -0,0 +1,4 @@ +config DRIVERS_I2C_MAX98927 + bool + default n + depends on HAVE_ACPI_TABLES diff --git a/src/drivers/i2c/max98927/Makefile.inc b/src/drivers/i2c/max98927/Makefile.inc new file mode 100644 index 0000000000..3bafee11b6 --- /dev/null +++ b/src/drivers/i2c/max98927/Makefile.inc @@ -0,0 +1 @@ +ramstage-$(CONFIG_DRIVERS_I2C_MAX98927) += max98927.c diff --git a/src/drivers/i2c/max98927/chip.h b/src/drivers/i2c/max98927/chip.h new file mode 100644 index 0000000000..c7101bc01f --- /dev/null +++ b/src/drivers/i2c/max98927/chip.h @@ -0,0 +1,30 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2017 Intel Corp. + * + * 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. + */ + +/* + * Maxim MAX98927 audio codec devicetree bindings + */ +struct drivers_i2c_max98927_config { + /* I2C Bus Frequency in Hertz (default 400kHz) */ + unsigned int bus_speed; + /* Set ‘1’ if I2S channel size is not 32bit. */ + bool interleave_mode; + /* Identifier for chips */ + unsigned int uid; + /* Device Description */ + const char *desc; + /* ACPI Device Name */ + const char *name; +}; diff --git a/src/drivers/i2c/max98927/max98927.c b/src/drivers/i2c/max98927/max98927.c new file mode 100644 index 0000000000..a3e6661a00 --- /dev/null +++ b/src/drivers/i2c/max98927/max98927.c @@ -0,0 +1,100 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2017 Intel Corporation. + * + * 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.h> +#include <arch/acpi_device.h> +#include <arch/acpigen.h> +#include <console/console.h> +#include <device/i2c.h> +#include <device/device.h> +#include <device/path.h> +#include <stdint.h> +#include <string.h> +#include "chip.h" + +#define MAX98927_ACPI_NAME "MAXI" +#define MAX98927_ACPI_HID "MX98927" + +static void max98927_fill_ssdt(struct device *dev) +{ + struct drivers_i2c_max98927_config *config = dev->chip_info; + const char *scope = acpi_device_scope(dev); + struct acpi_i2c i2c = { + .address = dev->path.i2c.device, + .mode_10bit = dev->path.i2c.mode_10bit, + .speed = config->bus_speed ? : I2C_SPEED_FAST, + .resource = scope, + }; + struct acpi_dp *dp; + + if (!dev->enabled || !scope) + return; + + /* Device */ + acpigen_write_scope(scope); + acpigen_write_device(acpi_device_name(dev)); + acpigen_write_name_string("_HID", MAX98927_ACPI_HID); + acpigen_write_name_integer("_UID", config->uid); + if (config->desc) + acpigen_write_name_string("_DDN", config->desc); + acpigen_write_STA(ACPI_STATUS_DEVICE_ALL_ON); + + /* Resources */ + acpigen_write_name("_CRS"); + acpigen_write_resourcetemplate_header(); + acpi_device_write_i2c(&i2c); + acpigen_write_resourcetemplate_footer(); + + /* Device Properties */ + dp = acpi_dp_new_table("_DSD"); + + acpi_dp_add_integer(dp, "interleave_mode", config->interleave_mode); + + acpi_dp_write(dp); + + acpigen_pop_len(); /* Device */ + acpigen_pop_len(); /* Scope */ + + printk(BIOS_INFO, "%s: %s address 0%xh\n", acpi_device_path(dev), + dev->chip_ops->name, dev->path.i2c.device); +} + +static const char *max98927_acpi_name(struct device *dev) +{ + struct drivers_i2c_max98927_config *config = dev->chip_info; + + if (config->name) + return config->name; + + return MAX98927_ACPI_NAME; +} + +static struct device_operations max98927_ops = { + .read_resources = DEVICE_NOOP, + .set_resources = DEVICE_NOOP, + .enable_resources = DEVICE_NOOP, + .acpi_name = &max98927_acpi_name, + .acpi_fill_ssdt_generator = &max98927_fill_ssdt, +}; + +static void max98927_enable(struct device *dev) +{ + dev->ops = &max98927_ops; +} + +struct chip_operations drivers_i2c_max98927_ops = { + CHIP_NAME("Maxim MAX98927 Codec") + .enable_dev = &max98927_enable +}; |