| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright 2013 Google Inc. All rights reserved. |
| * |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA |
| */ |
| |
| #include <console/console.h> |
| #include <delay.h> |
| #include <device/device.h> |
| #include <device/smbus.h> |
| #include <device/pci.h> |
| #include "chip.h" |
| |
| /* Chip commands */ |
| #define RTD2132_COMMAND 0x01 |
| #define RTD2132_DATA 0x00 |
| #define RTD2132_FIRMWARE 0x80 |
| #define RTD2132_FIRMWARE_START 0x00 |
| #define RTD2132_FIRMWARE_STOP 0x01 |
| |
| /* Spread spectrum configuration */ |
| #define RTD2132_COMMAND_SSCG_CONFIG_0 0x39 |
| #define RTD2132_SSCG_ENABLE 0xa0 |
| #define RTD2132_SSCG_DISABLE 0x20 |
| #define RTD2132_COMMAND_SSCG_CONFIG_1 0x3a |
| #define RTD2132_SSCG_CONFIG_DISABLED 0x01 /* DISABLED */ |
| #define RTD2132_SSCG_CONFIG_0_5 0x07 /* 0.5% */ |
| #define RTD2132_SSCG_CONFIG_1_0 0x0f /* 1.0% */ |
| #define RTD2132_SSCG_CONFIG_1_5 0x16 /* 1.5% */ |
| |
| /* Configuration values from devicetree */ |
| #define RTD2132_SSCG_PERCENT_0_0 0x00 /* DISABLED */ |
| #define RTD2132_SSCG_PERCENT_0_5 0x05 /* 0.5% */ |
| #define RTD2132_SSCG_PERCENT_1_0 0x10 /* 1.0% */ |
| #define RTD2132_SSCG_PERCENT_1_5 0x15 /* 1.5% */ |
| |
| static void rtd2132_firmware_stop(device_t dev) |
| { |
| smbus_write_byte(dev, RTD2132_FIRMWARE, RTD2132_FIRMWARE_STOP); |
| mdelay(2); |
| } |
| |
| static void rtd2132_firmware_start(device_t dev) |
| { |
| smbus_write_byte(dev, RTD2132_FIRMWARE, RTD2132_FIRMWARE_START); |
| } |
| |
| static void rtd2132_sscg_enable(device_t dev, u8 sscg_percent) |
| { |
| /* SSCG_Config_0 */ |
| smbus_write_byte(dev, RTD2132_COMMAND, RTD2132_COMMAND_SSCG_CONFIG_0); |
| smbus_write_byte(dev, RTD2132_DATA, RTD2132_SSCG_ENABLE); |
| |
| /* SSCG_Config_1 */ |
| smbus_write_byte(dev, RTD2132_COMMAND, RTD2132_COMMAND_SSCG_CONFIG_1); |
| smbus_write_byte(dev, RTD2132_DATA, sscg_percent); |
| } |
| |
| static void rtd2132_sscg_disable(device_t dev) |
| { |
| /* SSCG_Config_0 */ |
| smbus_write_byte(dev, RTD2132_COMMAND, RTD2132_COMMAND_SSCG_CONFIG_0); |
| smbus_write_byte(dev, RTD2132_DATA, RTD2132_SSCG_DISABLE); |
| |
| /* SSCG_Config_1 */ |
| smbus_write_byte(dev, RTD2132_COMMAND, RTD2132_COMMAND_SSCG_CONFIG_1); |
| smbus_write_byte(dev, RTD2132_DATA, RTD2132_SSCG_CONFIG_DISABLED); |
| } |
| |
| static void rtd2132_setup(device_t dev) |
| { |
| struct drivers_i2c_rtd2132_config *config = dev->chip_info; |
| |
| if (!config) |
| return; |
| |
| /* Stop running firmware */ |
| rtd2132_firmware_stop(dev); |
| |
| /* Spread spectrum configuration */ |
| switch (config->sscg_percent) { |
| case RTD2132_SSCG_PERCENT_0_0: |
| printk(BIOS_INFO, "RTD2132: Disable Spread Spectrum\n"); |
| rtd2132_sscg_disable(dev); |
| break; |
| case RTD2132_SSCG_PERCENT_0_5: |
| printk(BIOS_INFO, "RTD2132: Enable 0.5%% Spread Spectrum\n"); |
| rtd2132_sscg_enable(dev, RTD2132_SSCG_CONFIG_0_5); |
| break; |
| case RTD2132_SSCG_PERCENT_1_0: |
| printk(BIOS_INFO, "RTD2132: Enable 1.0%% Spread Spectrum\n"); |
| rtd2132_sscg_enable(dev, RTD2132_SSCG_CONFIG_1_0); |
| break; |
| case RTD2132_SSCG_PERCENT_1_5: |
| printk(BIOS_INFO, "RTD2132: Enable 1.5%% Spread Spectrum\n"); |
| rtd2132_sscg_enable(dev, RTD2132_SSCG_CONFIG_1_5); |
| break; |
| default: |
| printk(BIOS_ERR, "RTD2132: Invalid Spread Spectrum 0x%02x\n", |
| config->sscg_percent); |
| } |
| |
| /* Start firmware */ |
| rtd2132_firmware_start(dev); |
| } |
| |
| static void rtd2132_init(device_t dev) |
| { |
| if (dev->enabled && dev->path.type == DEVICE_PATH_I2C && |
| ops_smbus_bus(get_pbus_smbus(dev))) { |
| rtd2132_setup(dev); |
| } |
| } |
| |
| static void rtd2132_noop(device_t dummy) |
| { |
| } |
| |
| static struct device_operations rtd2132_operations = { |
| .read_resources = rtd2132_noop, |
| .set_resources = rtd2132_noop, |
| .enable_resources = rtd2132_noop, |
| .init = rtd2132_init, |
| }; |
| |
| static void enable_dev(struct device *dev) |
| { |
| dev->ops = &rtd2132_operations; |
| } |
| |
| struct chip_operations drivers_i2c_rtd2132_ops = { |
| CHIP_NAME("Realtek RTD2132 LVDS Bridge") |
| .enable_dev = enable_dev, |
| }; |