Duncan Laurie | 21a097a | 2016-05-11 09:50:59 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright 2016 Google Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <arch/acpi_device.h> |
| 17 | #include <arch/acpigen.h> |
| 18 | #include <console/console.h> |
| 19 | #include <device/i2c.h> |
| 20 | #include <device/device.h> |
| 21 | #include <device/path.h> |
| 22 | #include <gpio.h> |
| 23 | #include <stdint.h> |
| 24 | #include <string.h> |
| 25 | #include "chip.h" |
| 26 | |
| 27 | #if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES) |
| 28 | static void i2c_generic_fill_ssdt(struct device *dev) |
| 29 | { |
| 30 | struct drivers_i2c_generic_config *config = dev->chip_info; |
| 31 | const char *scope = acpi_device_scope(dev); |
| 32 | struct acpi_i2c i2c = { |
| 33 | .address = dev->path.i2c.device, |
| 34 | .mode_10bit = dev->path.i2c.mode_10bit, |
Duncan Laurie | 14b2a4d | 2016-06-08 13:49:40 -0700 | [diff] [blame] | 35 | .speed = config->speed ? : I2C_SPEED_FAST, |
Duncan Laurie | 21a097a | 2016-05-11 09:50:59 -0700 | [diff] [blame] | 36 | .resource = scope, |
| 37 | }; |
| 38 | |
| 39 | if (!dev->enabled || !scope) |
| 40 | return; |
| 41 | |
| 42 | if (!config->hid) { |
| 43 | printk(BIOS_ERR, "%s: ERROR: HID required\n", dev_path(dev)); |
| 44 | return; |
| 45 | } |
| 46 | |
| 47 | /* Device */ |
| 48 | acpigen_write_scope(scope); |
| 49 | acpigen_write_device(acpi_device_name(dev)); |
| 50 | acpigen_write_name_string("_HID", config->hid); |
| 51 | acpigen_write_name_integer("_UID", config->uid); |
| 52 | acpigen_write_name_string("_DDN", config->desc); |
| 53 | acpigen_write_STA(ACPI_STATUS_DEVICE_ALL_ON); |
| 54 | |
| 55 | /* Resources */ |
| 56 | acpigen_write_name("_CRS"); |
| 57 | acpigen_write_resourcetemplate_header(); |
| 58 | acpi_device_write_i2c(&i2c); |
| 59 | acpi_device_write_interrupt(&config->irq); |
| 60 | acpigen_write_resourcetemplate_footer(); |
| 61 | |
| 62 | /* Wake capabilities */ |
| 63 | if (config->wake) { |
| 64 | acpigen_write_name_integer("_S0W", 4); |
| 65 | acpigen_write_PRW(config->wake, 3); |
| 66 | } |
| 67 | |
| 68 | acpigen_pop_len(); /* Device */ |
| 69 | acpigen_pop_len(); /* Scope */ |
| 70 | |
| 71 | printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev), |
| 72 | config->desc ? : dev->chip_ops->name, dev_path(dev)); |
| 73 | } |
| 74 | |
| 75 | /* Use name specified in config or build one from I2C address */ |
| 76 | static const char *i2c_generic_acpi_name(struct device *dev) |
| 77 | { |
| 78 | struct drivers_i2c_generic_config *config = dev->chip_info; |
| 79 | static char name[5]; |
| 80 | |
| 81 | if (config->name) |
| 82 | return name; |
| 83 | |
| 84 | snprintf(name, sizeof(name), "D%03.3X", dev->path.i2c.device); |
| 85 | name[4] = '\0'; |
| 86 | return name; |
| 87 | } |
| 88 | #endif |
| 89 | |
| 90 | static struct device_operations i2c_generic_ops = { |
| 91 | .read_resources = DEVICE_NOOP, |
| 92 | .set_resources = DEVICE_NOOP, |
| 93 | .enable_resources = DEVICE_NOOP, |
| 94 | #if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES) |
| 95 | .acpi_name = &i2c_generic_acpi_name, |
| 96 | .acpi_fill_ssdt_generator = &i2c_generic_fill_ssdt, |
| 97 | #endif |
| 98 | }; |
| 99 | |
| 100 | static void i2c_generic_enable(struct device *dev) |
| 101 | { |
| 102 | struct drivers_i2c_generic_config *config = dev->chip_info; |
| 103 | |
| 104 | /* Check if device is present by reading GPIO */ |
| 105 | if (config->device_present_gpio) { |
| 106 | int present = gpio_get(config->device_present_gpio); |
| 107 | present ^= config->device_present_gpio_invert; |
| 108 | |
| 109 | printk(BIOS_INFO, "%s is %spresent\n", |
| 110 | dev->chip_ops->name, present ? "" : "not "); |
| 111 | |
| 112 | if (!present) { |
| 113 | dev->enabled = 0; |
| 114 | return; |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | dev->ops = &i2c_generic_ops; |
| 119 | } |
| 120 | |
| 121 | struct chip_operations drivers_i2c_generic_ops = { |
| 122 | CHIP_NAME("I2C Device") |
| 123 | .enable_dev = &i2c_generic_enable |
| 124 | }; |