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-rw-r--r--src/drivers/i2c/Kconfig1
-rw-r--r--src/drivers/i2c/Makefile.inc1
-rw-r--r--src/drivers/i2c/rtd2132/Kconfig5
-rw-r--r--src/drivers/i2c/rtd2132/Makefile.inc1
-rw-r--r--src/drivers/i2c/rtd2132/chip.h29
-rw-r--r--src/drivers/i2c/rtd2132/rtd2132.c147
6 files changed, 184 insertions, 0 deletions
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 <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,
+};
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-02 10:41:01 +0000