From 0cf0d1499ab4fb86a6c85f83ab4097a62e2e3642 Mon Sep 17 00:00:00 2001 From: Duncan Laurie Date: Mon, 15 Jul 2013 09:11:21 -0700 Subject: rtd2132: Add driver for Realtek RTD2132 LVDS bridge This driver allows the mainboard to enable spread spectrum clocking at 0.5%, 1.0%, and 1.5% with devicetree settings. Change-Id: I59c61e67aa8e951fd9904ad951deb6d0ba29669e Signed-off-by: Duncan Laurie Reviewed-on: https://gerrit.chromium.org/gerrit/61894 Reviewed-on: http://review.coreboot.org/4365 Reviewed-by: Patrick Georgi Tested-by: build bot (Jenkins) --- src/drivers/i2c/Kconfig | 1 + src/drivers/i2c/Makefile.inc | 1 + src/drivers/i2c/rtd2132/Kconfig | 5 ++ src/drivers/i2c/rtd2132/Makefile.inc | 1 + src/drivers/i2c/rtd2132/chip.h | 29 +++++++ src/drivers/i2c/rtd2132/rtd2132.c | 147 +++++++++++++++++++++++++++++++++++ 6 files changed, 184 insertions(+) create mode 100644 src/drivers/i2c/rtd2132/Kconfig create mode 100644 src/drivers/i2c/rtd2132/Makefile.inc create mode 100644 src/drivers/i2c/rtd2132/chip.h create mode 100644 src/drivers/i2c/rtd2132/rtd2132.c (limited to 'src') diff --git a/src/drivers/i2c/Kconfig b/src/drivers/i2c/Kconfig index 4eb3f3f1f3..a6f59f4492 100644 --- a/src/drivers/i2c/Kconfig +++ b/src/drivers/i2c/Kconfig @@ -4,5 +4,6 @@ source src/drivers/i2c/adt7463/Kconfig source src/drivers/i2c/i2cmux/Kconfig source src/drivers/i2c/i2cmux2/Kconfig source src/drivers/i2c/lm63/Kconfig +source src/drivers/i2c/rtd2132/Kconfig source src/drivers/i2c/w83795/Kconfig source src/drivers/i2c/w83793/Kconfig diff --git a/src/drivers/i2c/Makefile.inc b/src/drivers/i2c/Makefile.inc index 331b26c135..ef7ac4b2b2 100644 --- a/src/drivers/i2c/Makefile.inc +++ b/src/drivers/i2c/Makefile.inc @@ -4,5 +4,6 @@ subdirs-y += adt7463 subdirs-y += i2cmux subdirs-y += i2cmux2 subdirs-y += lm63 +subdirs-y += rtd2132 subdirs-y += w83795 subdirs-y += w83793 diff --git a/src/drivers/i2c/rtd2132/Kconfig b/src/drivers/i2c/rtd2132/Kconfig new file mode 100644 index 0000000000..f76b14ff23 --- /dev/null +++ b/src/drivers/i2c/rtd2132/Kconfig @@ -0,0 +1,5 @@ +config DRIVERS_I2C_RTD2132 + bool + default n + help + Enable support for Realtek RTD2132 DisplayPort to LVDS bridge chip. diff --git a/src/drivers/i2c/rtd2132/Makefile.inc b/src/drivers/i2c/rtd2132/Makefile.inc new file mode 100644 index 0000000000..4974a479ce --- /dev/null +++ b/src/drivers/i2c/rtd2132/Makefile.inc @@ -0,0 +1 @@ +ramstage-$(CONFIG_DRIVERS_I2C_RTD2132) += rtd2132.c diff --git a/src/drivers/i2c/rtd2132/chip.h b/src/drivers/i2c/rtd2132/chip.h new file mode 100644 index 0000000000..34ae91a3fe --- /dev/null +++ b/src/drivers/i2c/rtd2132/chip.h @@ -0,0 +1,29 @@ +/* + * 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 + */ + +struct drivers_i2c_rtd2132_config { + /* + * LVDS Spread Spectrum Clock + * 0x00 = DISABLED + * 0x05 = 0.5% + * 0x10 = 1.0% + * 0x15 = 1.5% + */ + u8 sscg_percent; +}; diff --git a/src/drivers/i2c/rtd2132/rtd2132.c b/src/drivers/i2c/rtd2132/rtd2132.c new file mode 100644 index 0000000000..a3470b0453 --- /dev/null +++ b/src/drivers/i2c/rtd2132/rtd2132.c @@ -0,0 +1,147 @@ +/* + * 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 +#include +#include +#include +#include +#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, +}; -- cgit v1.2.3