| /* |
| * 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 <stdlib.h> |
| #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 |
| |
| /* Panel Power Sequence Timing Registers. */ |
| #define RTD2132_COMMAND_PWR_SEQ_T1 0x32 /* 1ms units. */ |
| #define RTD2132_COMMAND_PWR_SEQ_T2 0x33 /* 4ms units. */ |
| #define RTD2132_COMMAND_PWR_SEQ_T3 0x34 /* 1ms units. */ |
| #define RTD2132_COMMAND_PWR_SEQ_T4 0x35 /* 1ms units. */ |
| #define RTD2132_COMMAND_PWR_SEQ_T5 0x36 /* 4ms units. */ |
| #define RTD2132_COMMAND_PWR_SEQ_T6 0x37 /* 1ms units. */ |
| #define RTD2132_COMMAND_PWR_SEQ_T7 0x38 /* 4ms units. */ |
| |
| /* 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% */ |
| |
| /* LVDS Swap */ |
| #define RTD2132_COMMAND_LVDS_SWAP 0x3b |
| #define RTD2132_LVDS_SWAP_DUAL 0x80 |
| #define RTD2132_LVDS_SWAP_NORMAL 0x04 |
| #define RTD2132_LVDS_SWAP_MIRROR 0x14 |
| #define RTD2132_LVDS_SWAP_P_N 0x24 |
| #define RTD2132_LVDS_SWAP_MIRROR_P_N 0x34 |
| #define RTD2132_LVDS_SWAP_R_L 0x0c |
| |
| /* 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% */ |
| |
| #define RTD2132_LVDS_SWAP_CFG_DUAL 0x80 |
| #define RTD2132_LVDS_SWAP_CFG_NORMAL 0x00 |
| #define RTD2132_LVDS_SWAP_CFG_MIRROR 0x01 |
| #define RTD2132_LVDS_SWAP_CFG_P_N 0x02 |
| #define RTD2132_LVDS_SWAP_CFG_MIRROR_P_N 0x03 |
| #define RTD2132_LVDS_SWAP_CFG_R_L 0x04 |
| |
| #define RTD2132_DEBUG_REG 0 |
| |
| static void rtd2132_write_reg(device_t dev, u8 reg, u8 value) |
| { |
| if (RTD2132_DEBUG_REG) |
| printk(BIOS_DEBUG, "RTD2132 0x%02x <- 0x%02x\n", reg, value); |
| smbus_write_byte(dev, RTD2132_COMMAND, reg); |
| smbus_write_byte(dev, RTD2132_DATA, value); |
| } |
| |
| static void rtd2132_firmware_stop(device_t dev) |
| { |
| smbus_write_byte(dev, RTD2132_FIRMWARE, RTD2132_FIRMWARE_STOP); |
| mdelay(60); |
| } |
| |
| static void rtd2132_firmware_start(device_t dev) |
| { |
| smbus_write_byte(dev, RTD2132_FIRMWARE, RTD2132_FIRMWARE_START); |
| } |
| |
| static void rtd2132_pps(device_t dev, struct drivers_i2c_rtd2132_config *cfg) |
| { |
| /* T2, T5, and T7 register values are in units of 4ms. */ |
| rtd2132_write_reg(dev, RTD2132_COMMAND_PWR_SEQ_T1, cfg->t1); |
| rtd2132_write_reg(dev, RTD2132_COMMAND_PWR_SEQ_T2, cfg->t2 / 4); |
| rtd2132_write_reg(dev, RTD2132_COMMAND_PWR_SEQ_T3, cfg->t3); |
| rtd2132_write_reg(dev, RTD2132_COMMAND_PWR_SEQ_T4, cfg->t4); |
| rtd2132_write_reg(dev, RTD2132_COMMAND_PWR_SEQ_T5, cfg->t5 / 4); |
| rtd2132_write_reg(dev, RTD2132_COMMAND_PWR_SEQ_T6, cfg->t6); |
| rtd2132_write_reg(dev, RTD2132_COMMAND_PWR_SEQ_T7, cfg->t7 / 4); |
| } |
| |
| static void rtd2132_sscg_enable(device_t dev, u8 sscg_percent) |
| { |
| /* SSCG_Config_0 */ |
| rtd2132_write_reg(dev, RTD2132_COMMAND_SSCG_CONFIG_0, |
| RTD2132_SSCG_ENABLE); |
| |
| /* SSCG_Config_1 */ |
| rtd2132_write_reg(dev, RTD2132_COMMAND_SSCG_CONFIG_1, sscg_percent); |
| } |
| |
| static void rtd2132_sscg_disable(device_t dev) |
| { |
| /* SSCG_Config_0 */ |
| rtd2132_write_reg(dev, RTD2132_COMMAND_SSCG_CONFIG_0, |
| RTD2132_SSCG_DISABLE); |
| |
| /* SSCG_Config_1 */ |
| rtd2132_write_reg(dev, RTD2132_COMMAND_SSCG_CONFIG_1, |
| RTD2132_SSCG_CONFIG_DISABLED); |
| } |
| |
| static void rtd2132_sscg(device_t dev, struct drivers_i2c_rtd2132_config *cfg) |
| { |
| switch (cfg->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", |
| cfg->sscg_percent); |
| } |
| } |
| |
| static void rtd2132_lvds_swap(device_t dev, |
| struct drivers_i2c_rtd2132_config *cfg) |
| { |
| u8 swap_value = RTD2132_LVDS_SWAP_NORMAL; |
| |
| switch (cfg->lvds_swap & ~RTD2132_LVDS_SWAP_CFG_DUAL) { |
| case RTD2132_LVDS_SWAP_CFG_NORMAL: |
| swap_value = RTD2132_LVDS_SWAP_NORMAL; |
| break; |
| case RTD2132_LVDS_SWAP_CFG_MIRROR: |
| swap_value = RTD2132_LVDS_SWAP_MIRROR; |
| break; |
| case RTD2132_LVDS_SWAP_CFG_P_N: |
| swap_value = RTD2132_LVDS_SWAP_P_N; |
| break; |
| case RTD2132_LVDS_SWAP_CFG_MIRROR_P_N: |
| swap_value = RTD2132_LVDS_SWAP_MIRROR_P_N; |
| break; |
| case RTD2132_LVDS_SWAP_CFG_R_L: |
| swap_value = RTD2132_LVDS_SWAP_R_L; |
| break; |
| default: |
| printk(BIOS_ERR, "RTD2132: Invalid LVDS swap value 0x%02x\n", |
| cfg->lvds_swap); |
| } |
| |
| if (cfg->lvds_swap & RTD2132_LVDS_SWAP_CFG_DUAL) |
| swap_value |= RTD2132_LVDS_SWAP_DUAL; |
| |
| printk(BIOS_INFO, "RTD2132: LVDS Swap 0x%02x\n", swap_value);; |
| |
| rtd2132_write_reg(dev, RTD2132_COMMAND_LVDS_SWAP, swap_value); |
| } |
| |
| static void rtd2132_defaults(device_t dev) |
| { |
| static const struct def_setting { |
| u8 reg; |
| u8 value; |
| } def_settings[] = { |
| { 0x3c, 0x06 }, |
| { 0x3d, 0x38 }, |
| { 0x3e, 0x73 }, |
| { 0x3f, 0x33 }, |
| { 0x06, 0x90 }, |
| { 0x06, 0xb0 }, |
| { 0x06, 0x80 }, |
| }; |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(def_settings); i++) |
| rtd2132_write_reg(dev, def_settings[i].reg, |
| def_settings[i].value); |
| } |
| |
| 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); |
| |
| /* Panel Power Sequencing Settings. */ |
| rtd2132_pps(dev, config); |
| |
| /* Spread spectrum configuration */ |
| rtd2132_sscg(dev, config); |
| |
| /* LVDS Swap Setting. */ |
| rtd2132_lvds_swap(dev, config); |
| |
| /* Default settings. */ |
| rtd2132_defaults(dev); |
| |
| /* 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, |
| }; |