meta-quanta: gbs: add kernel config and drivers
1. set kernel config for GBS machine
2. add AMD CPU temperature hwmon driver
3. add seven segment display drivers
Signed-off-by: George Hung <george.hung@quantatw.com>
Change-Id: I451b789fa842181a0c191ef9aff2ae8c88b8a6ee
diff --git a/meta-gbs/recipes-kernel/linux/linux-nuvoton/0003-Add-basic-support-for-SB-TSI-sensors.patch b/meta-gbs/recipes-kernel/linux/linux-nuvoton/0003-Add-basic-support-for-SB-TSI-sensors.patch
new file mode 100644
index 0000000..b690a98
--- /dev/null
+++ b/meta-gbs/recipes-kernel/linux/linux-nuvoton/0003-Add-basic-support-for-SB-TSI-sensors.patch
@@ -0,0 +1,327 @@
+SB Temperature Sensor Interface (SB-TSI) is an SMBus compatible
+interface that reports AMD SoC's Ttcl (normalized temperature),
+and resembles a typical 8-pin remote temperature sensor's I2C interface
+to BMC.
+
+This commit adds basic support using this interface to read CPU
+temperature, and read/write high/low CPU temp thresholds.
+
+To instantiate this driver on an AMD CPU with SB-TSI
+support, the i2c bus number would be the bus connected from the board
+management controller (BMC) to the CPU. The i2c address is specified in
+Section 6.3.1 of the spec [1]: The SB-TSI address is normally 98h for socket 0
+and 90h for socket 1, but it could vary based on hardware address select pins.
+
+[1]: https://www.amd.com/system/files/TechDocs/56255_OSRR.pdf
+
+Test status: tested reading temp1_input, and reading/writing
+temp1_max/min.
+
+Signed-off-by: Kun Yi <kunyi at google.com>
+---
+ drivers/hwmon/Kconfig | 10 ++
+ drivers/hwmon/Makefile | 1 +
+ drivers/hwmon/sbtsi_temp.c | 259 +++++++++++++++++++++++++++++++++++++
+ 3 files changed, 270 insertions(+)
+ create mode 100644 drivers/hwmon/sbtsi_temp.c
+
+diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
+index 05a30832c6ba..9585dcd01d1b 100644
+--- a/drivers/hwmon/Kconfig
++++ b/drivers/hwmon/Kconfig
+@@ -1412,6 +1412,16 @@ config SENSORS_RASPBERRYPI_HWMON
+ This driver can also be built as a module. If so, the module
+ will be called raspberrypi-hwmon.
+
++config SENSORS_SBTSI
++ tristate "Emulated SB-TSI temperature sensor"
++ depends on I2C
++ help
++ If you say yes here you get support for emulated temperature
++ sensors on AMD SoCs with SB-TSI interface connected to a BMC device.
++
++ This driver can also be built as a module. If so, the module will
++ be called sbtsi_temp.
++
+ config SENSORS_SHT15
+ tristate "Sensiron humidity and temperature sensors. SHT15 and compat."
+ depends on GPIOLIB || COMPILE_TEST
+diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
+index b0b9c8e57176..cd109f003ce4 100644
+--- a/drivers/hwmon/Makefile
++++ b/drivers/hwmon/Makefile
+@@ -152,6 +152,7 @@ obj-$(CONFIG_SENSORS_POWR1220) += powr1220.o
+ obj-$(CONFIG_SENSORS_PWM_FAN) += pwm-fan.o
+ obj-$(CONFIG_SENSORS_RASPBERRYPI_HWMON) += raspberrypi-hwmon.o
+ obj-$(CONFIG_SENSORS_S3C) += s3c-hwmon.o
++obj-$(CONFIG_SENSORS_SBTSI) += sbtsi_temp.o
+ obj-$(CONFIG_SENSORS_SCH56XX_COMMON)+= sch56xx-common.o
+ obj-$(CONFIG_SENSORS_SCH5627) += sch5627.o
+ obj-$(CONFIG_SENSORS_SCH5636) += sch5636.o
+diff --git a/drivers/hwmon/sbtsi_temp.c b/drivers/hwmon/sbtsi_temp.c
+new file mode 100644
+index 000000000000..e3ad6a9f7ec1
+--- /dev/null
++++ b/drivers/hwmon/sbtsi_temp.c
+@@ -0,0 +1,259 @@
++// SPDX-License-Identifier: GPL-2.0-or-later
++/*
++ * sbtsi_temp.c - hwmon driver for a SBI Temperature Sensor Interface (SB-TSI)
++ * compliant AMD SoC temperature device.
++ *
++ * Copyright (c) 2020, Google Inc.
++ * Copyright (c) 2020, Kun Yi <kunyi at google.com>
++ */
++
++#include <linux/err.h>
++#include <linux/i2c.h>
++#include <linux/init.h>
++#include <linux/hwmon.h>
++#include <linux/module.h>
++#include <linux/mutex.h>
++#include <linux/of_device.h>
++#include <linux/of.h>
++
++/*
++ * SB-TSI registers only support SMBus byte data access. "_INT" registers are
++ * the integer part of a temperature value or limit, and "_DEC" registers are
++ * corresponding decimal parts.
++ */
++#define SBTSI_REG_TEMP_INT 0x01 /* RO */
++#define SBTSI_REG_STATUS 0x02 /* RO */
++#define SBTSI_REG_CONFIG 0x03 /* RO */
++#define SBTSI_REG_TEMP_HIGH_INT 0x07 /* RW */
++#define SBTSI_REG_TEMP_LOW_INT 0x08 /* RW */
++#define SBTSI_REG_TEMP_DEC 0x10 /* RW */
++#define SBTSI_REG_TEMP_HIGH_DEC 0x13 /* RW */
++#define SBTSI_REG_TEMP_LOW_DEC 0x14 /* RW */
++#define SBTSI_REG_REV 0xFF /* RO */
++
++#define SBTSI_CONFIG_READ_ORDER_SHIFT 5
++
++#define SBTSI_TEMP_MIN 0
++#define SBTSI_TEMP_MAX 255875
++#define SBTSI_REV_MAX_VALID_ID 4
++
++/* Each client has this additional data */
++struct sbtsi_data {
++ struct i2c_client *client;
++ struct mutex lock;
++};
++
++/*
++ * From SB-TSI spec: CPU temperature readings and limit registers encode the
++ * temperature in increments of 0.125 from 0 to 255.875. The "high byte"
++ * register encodes the base-2 of the integer portion, and the upper 3 bits of
++ * the "low byte" encode in base-2 the decimal portion.
++ *
++ * e.g. INT=0x19, DEC=0x20 represents 25.125 degrees Celsius
++ *
++ * Therefore temperature in millidegree Celsius =
++ * (INT + DEC / 256) * 1000 = (INT * 8 + DEC / 32) * 125
++ */
++static inline int sbtsi_reg_to_mc(s32 integer, s32 decimal)
++{
++ return ((integer << 3) + (decimal >> 5)) * 125;
++}
++
++/*
++ * Inversely, given temperature in millidegree Celsius
++ * INT = (TEMP / 125) / 8
++ * DEC = ((TEMP / 125) % 8) * 32
++ * Caller have to make sure temp doesn't exceed 255875, the max valid value.
++ */
++static inline void sbtsi_mc_to_reg(s32 temp, u8 *integer, u8 *decimal)
++{
++ temp /= 125;
++ *integer = temp >> 3;
++ *decimal = (temp & 0x7) << 5;
++}
++
++static int sbtsi_read(struct device *dev, enum hwmon_sensor_types type,
++ u32 attr, int channel, long *val)
++{
++ struct sbtsi_data *data = dev_get_drvdata(dev);
++ s32 temp_int, temp_dec;
++ int err, reg_int, reg_dec;
++ u8 read_order;
++
++ if (type != hwmon_temp)
++ return -EINVAL;
++
++ read_order = 0;
++ switch (attr) {
++ case hwmon_temp_input:
++ /*
++ * ReadOrder bit specifies the reading order of integer and
++ * decimal part of CPU temp for atomic reads. If bit == 0,
++ * reading integer part triggers latching of the decimal part,
++ * so integer part should be read first. If bit == 1, read
++ * order should be reversed.
++ */
++ err = i2c_smbus_read_byte_data(data->client, SBTSI_REG_CONFIG);
++ if (err < 0)
++ return err;
++
++ read_order = (u8)err & BIT(SBTSI_CONFIG_READ_ORDER_SHIFT);
++ reg_int = SBTSI_REG_TEMP_INT;
++ reg_dec = SBTSI_REG_TEMP_DEC;
++ break;
++ case hwmon_temp_max:
++ reg_int = SBTSI_REG_TEMP_HIGH_INT;
++ reg_dec = SBTSI_REG_TEMP_HIGH_DEC;
++ break;
++ case hwmon_temp_min:
++ reg_int = SBTSI_REG_TEMP_LOW_INT;
++ reg_dec = SBTSI_REG_TEMP_LOW_DEC;
++ break;
++ default:
++ return -EINVAL;
++ }
++
++ if (read_order == 0) {
++ temp_int = i2c_smbus_read_byte_data(data->client, reg_int);
++ temp_dec = i2c_smbus_read_byte_data(data->client, reg_dec);
++ } else {
++ temp_dec = i2c_smbus_read_byte_data(data->client, reg_dec);
++ temp_int = i2c_smbus_read_byte_data(data->client, reg_int);
++ }
++
++ if (temp_int < 0)
++ return temp_int;
++ if (temp_dec < 0)
++ return temp_dec;
++
++ *val = sbtsi_reg_to_mc(temp_int, temp_dec);
++
++ return 0;
++}
++
++static int sbtsi_write(struct device *dev, enum hwmon_sensor_types type,
++ u32 attr, int channel, long val)
++{
++ struct sbtsi_data *data = dev_get_drvdata(dev);
++ int reg_int, reg_dec, err;
++ u8 temp_int, temp_dec;
++
++ if (type != hwmon_temp)
++ return -EINVAL;
++
++ switch (attr) {
++ case hwmon_temp_max:
++ reg_int = SBTSI_REG_TEMP_HIGH_INT;
++ reg_dec = SBTSI_REG_TEMP_HIGH_DEC;
++ break;
++ case hwmon_temp_min:
++ reg_int = SBTSI_REG_TEMP_LOW_INT;
++ reg_dec = SBTSI_REG_TEMP_LOW_DEC;
++ break;
++ default:
++ return -EINVAL;
++ }
++
++ val = clamp_val(val, SBTSI_TEMP_MIN, SBTSI_TEMP_MAX);
++ mutex_lock(&data->lock);
++ sbtsi_mc_to_reg(val, &temp_int, &temp_dec);
++ err = i2c_smbus_write_byte_data(data->client, reg_int, temp_int);
++ if (err)
++ goto exit;
++
++ err = i2c_smbus_write_byte_data(data->client, reg_dec, temp_dec);
++exit:
++ mutex_unlock(&data->lock);
++ return err;
++}
++
++static umode_t sbtsi_is_visible(const void *data,
++ enum hwmon_sensor_types type,
++ u32 attr, int channel)
++{
++ switch (type) {
++ case hwmon_temp:
++ switch (attr) {
++ case hwmon_temp_input:
++ return 0444;
++ case hwmon_temp_min:
++ return 0644;
++ case hwmon_temp_max:
++ return 0644;
++ }
++ break;
++ default:
++ break;
++ }
++ return 0;
++}
++
++static const struct hwmon_channel_info *sbtsi_info[] = {
++ HWMON_CHANNEL_INFO(chip,
++ HWMON_C_REGISTER_TZ),
++ HWMON_CHANNEL_INFO(temp,
++ HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX),
++ NULL
++};
++
++static const struct hwmon_ops sbtsi_hwmon_ops = {
++ .is_visible = sbtsi_is_visible,
++ .read = sbtsi_read,
++ .write = sbtsi_write,
++};
++
++static const struct hwmon_chip_info sbtsi_chip_info = {
++ .ops = &sbtsi_hwmon_ops,
++ .info = sbtsi_info,
++};
++
++static int sbtsi_probe(struct i2c_client *client,
++ const struct i2c_device_id *id)
++{
++ struct device *dev = &client->dev;
++ struct device *hwmon_dev;
++ struct sbtsi_data *data;
++
++ data = devm_kzalloc(dev, sizeof(struct sbtsi_data), GFP_KERNEL);
++ if (!data)
++ return -ENOMEM;
++
++ data->client = client;
++ mutex_init(&data->lock);
++
++ hwmon_dev =
++ devm_hwmon_device_register_with_info(dev, client->name, data,
++ &sbtsi_chip_info, NULL);
++
++ return PTR_ERR_OR_ZERO(hwmon_dev);
++}
++
++static const struct i2c_device_id sbtsi_id[] = {
++ {"sbtsi", 0},
++ {}
++};
++MODULE_DEVICE_TABLE(i2c, sbtsi_id);
++
++static const struct of_device_id __maybe_unused sbtsi_of_match[] = {
++ {
++ .compatible = "amd,sbtsi",
++ },
++ { },
++};
++MODULE_DEVICE_TABLE(of, sbtsi_of_match);
++
++static struct i2c_driver sbtsi_driver = {
++ .class = I2C_CLASS_HWMON,
++ .driver = {
++ .name = "sbtsi",
++ .of_match_table = of_match_ptr(sbtsi_of_match),
++ },
++ .probe = sbtsi_probe,
++ .id_table = sbtsi_id,
++};
++
++module_i2c_driver(sbtsi_driver);
++
++MODULE_AUTHOR("Kun Yi <kunyi at google.com>");
++MODULE_DESCRIPTION("Hwmon driver for AMD SB-TSI emulated sensor");
++MODULE_LICENSE("GPL");
+--
+2.26.0.292.g33ef6b2f38-goog
\ No newline at end of file
diff --git a/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-Add-kernel-seven-seg-display-support.patch b/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-Add-kernel-seven-seg-display-support.patch
new file mode 100644
index 0000000..a21707d
--- /dev/null
+++ b/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-Add-kernel-seven-seg-display-support.patch
@@ -0,0 +1,10 @@
+diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
+index b9e6d4c3e906..aa7ce9d72d2c 100644
+--- a/drivers/misc/Makefile
++++ b/drivers/misc/Makefile
+@@ -59,3 +59,5 @@ obj-$(CONFIG_HABANA_AI) += habanalabs/
+ obj-$(CONFIG_XILINX_SDFEC) += xilinx_sdfec.o
+ obj-$(CONFIG_NPCM7XX_LPC_BPC) += npcm7xx-lpc-bpc.o
+ obj-$(CONFIG_NPCM7XX_PCI_MBOX) += npcm7xx-pci-mbox.o
++obj-$(CONFIG_SEVEN_SEGMENT_DISPLAY) += seven_seg_disp.o
++obj-$(CONFIG_SEVEN_SEGMENT_GPIO) += seven_seg_gpio.o
diff --git a/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Character-device-driver-for-seven-segme.patch b/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Character-device-driver-for-seven-segme.patch
new file mode 100644
index 0000000..8ae624a
--- /dev/null
+++ b/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Character-device-driver-for-seven-segme.patch
@@ -0,0 +1,293 @@
+From 2d46e81d9bbb624695bac8400a4ac41b7f116ec4 Mon Sep 17 00:00:00 2001
+From: Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>
+Date: Fri, 27 Jul 2018 12:34:54 -0700
+Subject: [PATCH 2/3] drivers: misc: Character device driver for seven segment
+ display
+
+Character device driver which implements the user-space
+API for letting a user write to two 7-segment displays including
+any conversion methods necessary to map the user input
+to two 7-segment displays.
+
+Signed-off-by: Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>
+Signed-off-by: Kun Yi <kunyi@google.com>
+Signed-off-by: Benjamin Fair <benjaminfair@google.com>
+---
+ drivers/misc/Kconfig | 8 ++
+ drivers/misc/Makefile | 1 +
+ drivers/misc/seven_seg_disp.c | 201 ++++++++++++++++++++++++++++++++++
+ drivers/misc/seven_seg_disp.h | 34 ++++++
+ 4 files changed, 244 insertions(+)
+ create mode 100644 drivers/misc/seven_seg_disp.c
+ create mode 100644 drivers/misc/seven_seg_disp.h
+
+diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
+index 9d96469fb41c..d443de886346 100644
+--- a/drivers/misc/Kconfig
++++ b/drivers/misc/Kconfig
+@@ -473,6 +473,14 @@ config VEXPRESS_SYSCFG
+ bus. System Configuration interface is one of the possible means
+ of generating transactions on this bus.
+
++config SEVEN_SEGMENT_DISPLAY
++ tristate "Character driver for seven segment display support"
++ help
++ Character device driver which implements the user-space
++ API for letting a user write to two 7-segment displays including
++ any conversion methods necessary to map the user input
++ to two 7-segment displays.
++
+ config PCI_ENDPOINT_TEST
+ depends on PCI
+ select CRC32
+
+diff --git a/drivers/misc/seven_seg_disp.c b/drivers/misc/seven_seg_disp.c
+new file mode 100644
+index 000000000000..db1c571f68e5
+--- /dev/null
++++ b/drivers/misc/seven_seg_disp.c
+@@ -0,0 +1,201 @@
++/*
++ * Copyright (c) 2016 Google, Inc
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 or later as
++ * published by the Free Software Foundation.
++ */
++
++#include <linux/module.h>
++#include <linux/version.h>
++#include <linux/kernel.h>
++#include <linux/types.h>
++#include <linux/kdev_t.h>
++#include <linux/fs.h>
++#include <linux/uaccess.h>
++#include <linux/ctype.h>
++#include <linux/of.h>
++#include <linux/io.h>
++#include <linux/slab.h>
++#include <linux/platform_device.h>
++
++#include "seven_seg_disp.h"
++
++#define LED_DOT 0x01
++
++/*
++ * 0 1 2 3 4 5 6 7 8 9 A B C D E F
++ * _ _ _ _ _ _ _ _ _ _ _ _
++ * | | | _| _| |_| |_ |_ | |_| |_| |_| |_ | _| |_ |_
++ * |_| | |_ _| | _| |_| | |_| | | | |_| |_ |_| |_ |
++ *
++ * data[7:1] = led[a:g]
++ */
++const u8 seven_seg_bits[] = {
++ 0xFC, 0x60, 0xDA, 0xF2, 0x66, 0xB6, 0xBE, 0xE0,
++ 0xFE, 0xF6, 0xEE, 0x3E, 0x9C, 0x7A, 0x9E, 0x8E
++ };
++
++/*
++ * 0 1 2 3 4 5 6 7 8 9 A B C D E F
++ * _ _ _ _ _
++ * | |_ |_| |_ _ _ _ _ _ _ _ |_ _| _| | |
++ * |_ |_ | | _| |_| |_| | |
++ *
++ * data[7:1] = led[a:g]
++ */
++const u8 special_seven_seg_bits[] = {
++ 0x00, 0x9C, 0x1E, 0xCE, 0x8E, 0x02, 0x02, 0x02,
++ 0x02, 0x02, 0x02, 0x02, 0xB6, 0x7A, 0x7A, 0xEC
++ };
++
++static dev_t seven_seg_devno;
++static struct class *seven_seg_disp_class;
++
++static int seven_seg_disp_open(struct inode *inode, struct file *filp)
++{
++ struct seven_seg_disp_dev *disp_dev;
++
++ disp_dev = container_of(inode->i_cdev,
++ struct seven_seg_disp_dev, cdev);
++ filp->private_data = disp_dev;
++ return 0;
++}
++
++static int seven_seg_disp_close(struct inode *inode, struct file *filp)
++{
++ filp->private_data = NULL;
++ return 0;
++}
++
++static ssize_t seven_seg_disp_read(struct file *filp, char __user *buf, size_t
++ len, loff_t *off)
++{
++ struct seven_seg_disp_dev *disp_dev = filp->private_data;
++
++ if (disp_dev->disp_data_valid)
++ return -EINVAL;
++
++ if (copy_to_user(buf, disp_dev->seven_seg_disp_data_array,
++ MAX_DISP_CHAR_SIZE) != 0) {
++ return -EFAULT;
++ }
++
++ return 0;
++}
++
++static u16 convert_to_disp_data(char *buf)
++{
++ u8 low_display;
++ u8 high_display;
++ u16 led_value;
++
++ low_display = seven_seg_bits[hex_to_bin(buf[2])];
++
++ high_display = (buf[0] == '1') ?
++ special_seven_seg_bits[hex_to_bin(buf[1])] :
++ seven_seg_bits[hex_to_bin(buf[1])];
++
++ led_value = low_display | (high_display << 8);
++ if (buf[0] == '1')
++ led_value |= LED_DOT | (LED_DOT << 8);
++
++ return led_value;
++}
++
++static ssize_t seven_seg_disp_write(struct file *filp, const char __user *buf,
++ size_t len, loff_t *off)
++{
++ int length = len - 1;
++ int i;
++
++ struct seven_seg_disp_dev *disp_dev = filp->private_data;
++
++ if (length != MAX_DISP_CHAR_SIZE)
++ return -EINVAL;
++
++ if (copy_from_user(disp_dev->seven_seg_disp_data_array,
++ buf, length) != 0) {
++ return -EFAULT;
++ }
++
++ for (i = 0; i < MAX_DISP_CHAR_SIZE; i++) {
++ if (!isxdigit(disp_dev->seven_seg_disp_data_array[i]))
++ return -EINVAL;
++ }
++
++ disp_dev->current_seven_seg_disp_data = convert_to_disp_data(
++ disp_dev->seven_seg_disp_data_array);
++ disp_dev->disp_data_valid = true;
++ disp_dev->update_seven_seg_data(&disp_dev->parent,
++ disp_dev->current_seven_seg_disp_data);
++
++ return len;
++}
++
++static const struct file_operations seven_seg_disp_fops = {
++
++ .owner = THIS_MODULE,
++ .open = seven_seg_disp_open,
++ .release = seven_seg_disp_close,
++ .read = seven_seg_disp_read,
++ .write = seven_seg_disp_write
++};
++
++void seven_seg_rem_cdev(struct seven_seg_disp_dev *disp_dev)
++{
++ cdev_del(&disp_dev->cdev);
++ device_destroy(seven_seg_disp_class, seven_seg_devno);
++}
++
++int seven_seg_setup_cdev(struct seven_seg_disp_dev *disp_dev,
++ void (*update_disp_data)(struct device *, u16 data))
++{
++ struct device *dev;
++ int err;
++
++ dev = device_create(seven_seg_disp_class, NULL,
++ seven_seg_devno,
++ NULL, "seven_seg_disp_val");
++ if (dev == NULL)
++ return -EIO;
++ disp_dev->dev = dev;
++ disp_dev->update_seven_seg_data = update_disp_data;
++ disp_dev->disp_data_valid = false;
++
++ cdev_init(&disp_dev->cdev, &seven_seg_disp_fops);
++ err = cdev_add(&disp_dev->cdev, seven_seg_devno, 1);
++ if (err)
++ device_destroy(seven_seg_disp_class, seven_seg_devno);
++ return err;
++}
++
++static int __init seven_seg_disp_init(void)
++{
++ int err = alloc_chrdev_region(&seven_seg_devno, 0, 1, "disp_state");
++
++ if (err < 0)
++ return err;
++
++ seven_seg_disp_class = class_create(THIS_MODULE, "disp_state");
++ if (seven_seg_disp_class == NULL)
++ goto unreg_chrdev;
++
++ return 0;
++
++unreg_chrdev:
++ unregister_chrdev_region(seven_seg_devno, 1);
++ return -EIO;
++}
++
++static void __exit seven_seg_disp_exit(void)
++{
++ class_destroy(seven_seg_disp_class);
++ unregister_chrdev_region(seven_seg_devno, 1);
++}
++
++module_init(seven_seg_disp_init);
++module_exit(seven_seg_disp_exit);
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>");
++MODULE_DESCRIPTION("Seven segment display character driver");
+diff --git a/drivers/misc/seven_seg_disp.h b/drivers/misc/seven_seg_disp.h
+new file mode 100644
+index 000000000000..0ebed0802747
+--- /dev/null
++++ b/drivers/misc/seven_seg_disp.h
+@@ -0,0 +1,34 @@
++/*
++ * Copyright (c) 2016 Google, Inc
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 or later as
++ * published by the Free Software Foundation.
++ */
++
++#ifndef SEVEN_SEG_DISP_H
++#define SEVEN_SEG_DISP_H
++
++#include <linux/device.h>
++#include <linux/cdev.h>
++
++#define MAX_DISP_CHAR_SIZE 3
++
++#define DEFAULT_REFRESH_INTERVAL_MS 600
++
++struct seven_seg_disp_dev {
++ bool disp_data_valid;
++ u16 current_seven_seg_disp_data;
++ char seven_seg_disp_data_array[MAX_DISP_CHAR_SIZE];
++ struct device parent;
++ struct device *dev;
++ struct cdev cdev;
++ void (*update_seven_seg_data)(struct device *, u16 data);
++};
++
++int seven_seg_setup_cdev(struct seven_seg_disp_dev *disp_dev,
++ void (*update_disp_data)(struct device *, u16 data));
++
++void seven_seg_rem_cdev(struct seven_seg_disp_dev *disp_dev);
++
++#endif
+--
+2.22.0.770.g0f2c4a37fd-goog
+
diff --git a/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Platform-driver-for-seven-segment-displ.patch b/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Platform-driver-for-seven-segment-displ.patch
new file mode 100644
index 0000000..b166c78
--- /dev/null
+++ b/meta-gbs/recipes-kernel/linux/linux-nuvoton/0004-ben-drivers-misc-Platform-driver-for-seven-segment-displ.patch
@@ -0,0 +1,267 @@
+From ea3e732d2c4a609e621346a96d37713820640196 Mon Sep 17 00:00:00 2001
+From: Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>
+Date: Fri, 27 Jul 2018 12:36:24 -0700
+Subject: [PATCH 3/3] drivers: misc: Platform driver for seven segment display
+ support
+
+Platform device driver which provides an API for displaying on two
+7-segment displays, and implements the required bit-banging.
+The hardware assumed is 74HC164 wired to two 7-segment displays.
+
+Signed-off-by: Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>
+Signed-off-by: Kun Yi <kunyi@google.com>
+Signed-off-by: Benjamin Fair <benjaminfair@google.com>
+---
+ drivers/misc/Kconfig | 8 ++
+# drivers/misc/Makefile | 2 ++
+ drivers/misc/seven_seg_gpio.c | 205 ++++++++++++++++++++++++++++++++++
+ 3 files changed, 215 insertions(+)
+ create mode 100644 drivers/misc/seven_seg_gpio.c
+
+diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
+index d443de886346..e10984e3288f 100644
+--- a/drivers/misc/Kconfig
++++ b/drivers/misc/Kconfig
+@@ -481,6 +481,14 @@ config SEVEN_SEGMENT_DISPLAY
+ any conversion methods necessary to map the user input
+ to two 7-segment displays.
+
++config SEVEN_SEGMENT_GPIO
++ tristate "Platform driver to update seven segment display"
++ depends on SEVEN_SEGMENT_DISPLAY
++ help
++ Platform device driver which provides an API for displaying on two
++ 7-segment displays, and implements the required bit-banging.
++ The hardware assumed is 74HC164 wired to two 7-segment displays.
++
+ config PCI_ENDPOINT_TEST
+ depends on PCI
+ select CRC32
+# diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
+# index 402bcc3c9961..f39bec664d92 100644
+# --- a/drivers/misc/Makefile
+# +++ b/drivers/misc/Makefile
+# @@ -53,6 +53,8 @@ obj-$(CONFIG_GENWQE) += genwqe/
+# obj-$(CONFIG_ECHO) += echo/
+# obj-$(CONFIG_VEXPRESS_SYSCFG) += vexpress-syscfg.o
+# obj-$(CONFIG_CXL_BASE) += cxl/
+# +obj-$(CONFIG_SEVEN_SEGMENT_DISPLAY) += seven_seg_disp.o
+# +obj-$(CONFIG_SEVEN_SEGMENT_GPIO) += seven_seg_gpio.o
+# obj-$(CONFIG_ASPEED_LPC_CTRL) += aspeed-lpc-ctrl.o
+# obj-$(CONFIG_ASPEED_LPC_SNOOP) += aspeed-lpc-snoop.o
+# obj-$(CONFIG_ASPEED_LPC_MBOX) += aspeed-lpc-mbox.o
+
+diff --git a/drivers/misc/seven_seg_gpio.c b/drivers/misc/seven_seg_gpio.c
+new file mode 100644
+index 000000000000..e03ea7f8b848
+--- /dev/null
++++ b/drivers/misc/seven_seg_gpio.c
+@@ -0,0 +1,205 @@
++/*
++ * Copyright (C) 2016 Google, Inc
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 or later as
++ * published by the Free Software Foundation.
++ */
++
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/timer.h>
++#include <linux/jiffies.h>
++#include <linux/sizes.h>
++#include <linux/io.h>
++#include <linux/delay.h>
++#include <linux/uaccess.h>
++#include <linux/mutex.h>
++#include <linux/of_platform.h>
++#include <linux/gpio/consumer.h>
++
++#include "seven_seg_disp.h"
++
++#define DELAY_INTVL_US 1
++
++#define CLOCK_GPIO_NAME "clock"
++#define DATA_GPIO_NAME "data"
++#define CLEAR_GPIO_NAME "clear"
++
++struct seven_seg_gpio_info {
++ u16 curr_disp_value;
++ u16 refresh_interval;
++ struct timer_list update_timer;
++ struct gpio_desc *clock_gpio;
++ struct gpio_desc *data_gpio;
++ struct gpio_desc *clear_gpio;
++};
++
++static void update_seven_seg_gpio_data(struct device *dev, u16 data)
++{
++ struct platform_device *pdev;
++ struct seven_seg_gpio_info *gpio_info;
++
++ pdev = container_of(dev, struct platform_device, dev);
++ if (pdev == NULL) {
++ pr_err("invalid NULL platform_device\n");
++ return;
++ }
++
++ gpio_info = platform_get_drvdata(pdev);
++ if (gpio_info == NULL) {
++ pr_err("invalid NULL gpio_info\n");
++ return;
++ }
++
++ gpio_info->curr_disp_value = data;
++}
++
++static void clear_seven_seg_gpio_data(struct device *dev, u16 data)
++{
++ struct platform_device *pdev;
++ struct seven_seg_gpio_info *gpio_info;
++
++ pdev = container_of(dev, struct platform_device, dev);
++ if (pdev == NULL) {
++ pr_err("invalid NULL platform_device\n");
++ return;
++ }
++
++ gpio_info = platform_get_drvdata(pdev);
++ if (gpio_info == NULL) {
++ pr_err("invalid NULL gpio_info\n");
++ return;
++ }
++
++ gpio_info->curr_disp_value = 0;
++}
++
++static void send_seven_seg_gpio_data(u16 disp_data,
++ struct seven_seg_gpio_info *gpio_info)
++{
++ int i;
++
++ gpiod_set_value(gpio_info->clear_gpio, 0);
++ udelay(DELAY_INTVL_US);
++ gpiod_set_value(gpio_info->clear_gpio, 1);
++ udelay(DELAY_INTVL_US);
++
++ for (i = 0; i < 16; i++) {
++ if (disp_data & 0x01)
++ gpiod_set_value(gpio_info->data_gpio, 1);
++ else
++ gpiod_set_value(gpio_info->data_gpio, 0);
++
++ udelay(DELAY_INTVL_US);
++
++ gpiod_set_value(gpio_info->clock_gpio, 0);
++ udelay(DELAY_INTVL_US);
++ gpiod_set_value(gpio_info->clock_gpio, 1);
++ udelay(DELAY_INTVL_US);
++
++ disp_data >>= 1;
++ }
++}
++
++static void disp_refresh_timer_handler(struct timer_list *t)
++{
++ u16 disp_data;
++ struct seven_seg_gpio_info *gpio_info =
++ from_timer(gpio_info, t, update_timer);
++ disp_data = gpio_info->curr_disp_value;
++
++ send_seven_seg_gpio_data(disp_data, gpio_info);
++ mod_timer(&gpio_info->update_timer,
++ jiffies + msecs_to_jiffies(gpio_info->refresh_interval));
++}
++
++static const struct of_device_id of_seven_seg_gpio_match[] = {
++ { .compatible = "seven-seg-gpio-dev" },
++ {},
++};
++
++MODULE_DEVICE_TABLE(of, of_seven_seg_gpio_match);
++
++static int seven_seg_gpio_probe(struct platform_device *pdev)
++{
++ u16 interval;
++ int result;
++ struct seven_seg_gpio_info *gpio_info;
++ struct device *dev = &pdev->dev;
++ struct seven_seg_disp_dev *disp_dev;
++
++ gpio_info = devm_kzalloc(dev,
++ sizeof(struct seven_seg_gpio_info),
++ GFP_KERNEL);
++ if (gpio_info == NULL)
++ return -ENOMEM;
++
++ /* Requesting the clock gpio */
++ gpio_info->clock_gpio = devm_gpiod_get(dev, CLOCK_GPIO_NAME,
++ GPIOD_OUT_HIGH);
++ if (IS_ERR(gpio_info->clock_gpio))
++ return PTR_ERR(gpio_info->clock_gpio);
++
++ /* Requesting the data gpio */
++ gpio_info->data_gpio = devm_gpiod_get(dev, DATA_GPIO_NAME,
++ GPIOD_OUT_HIGH);
++ if (IS_ERR(gpio_info->data_gpio))
++ return PTR_ERR(gpio_info->data_gpio);
++
++ /* Requesting the clear gpio */
++ gpio_info->clear_gpio = devm_gpiod_get(dev, CLEAR_GPIO_NAME,
++ GPIOD_OUT_HIGH);
++ if (IS_ERR(gpio_info->clear_gpio))
++ return PTR_ERR(gpio_info->clear_gpio);
++
++ result = of_property_read_u16(pdev->dev.of_node,
++ "refresh-interval-ms", &interval);
++ gpio_info->refresh_interval = result ? DEFAULT_REFRESH_INTERVAL_MS :
++ interval;
++
++ /* Start timer to update seven segment display every second */
++ timer_setup(&gpio_info->update_timer, disp_refresh_timer_handler, 0);
++ result = mod_timer(&gpio_info->update_timer,
++ jiffies +
++ msecs_to_jiffies(gpio_info->refresh_interval));
++ if (result)
++ return result;
++
++ gpio_info->curr_disp_value = 0;
++
++ platform_set_drvdata(pdev, gpio_info);
++
++ disp_dev = devm_kzalloc(dev, sizeof(struct seven_seg_disp_dev),
++ GFP_KERNEL);
++ disp_dev->parent = *dev;
++ seven_seg_setup_cdev(disp_dev, &update_seven_seg_gpio_data);
++ return 0;
++}
++
++static int seven_seg_gpio_remove(struct platform_device *pdev)
++{
++ struct seven_seg_gpio_info *gpio_info = platform_get_drvdata(pdev);
++ struct seven_seg_disp_dev *disp_dev =
++ container_of(&pdev->dev,
++ struct seven_seg_disp_dev, parent);
++ seven_seg_rem_cdev(disp_dev);
++ del_timer_sync(&gpio_info->update_timer);
++ platform_set_drvdata(pdev, NULL);
++ return 0;
++}
++
++static struct platform_driver seven_seg_gpio_driver = {
++ .probe = seven_seg_gpio_probe,
++ .remove = seven_seg_gpio_remove,
++ .driver = {
++ .name = "seven-seg-gpio",
++ .of_match_table = of_seven_seg_gpio_match,
++ },
++};
++
++module_platform_driver(seven_seg_gpio_driver);
++
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>");
++MODULE_DESCRIPTION("Seven segment display driver using GPIO config");
+--
+2.22.0.770.g0f2c4a37fd-goog
+
diff --git a/meta-gbs/recipes-kernel/linux/linux-nuvoton/gbs.cfg b/meta-gbs/recipes-kernel/linux/linux-nuvoton/gbs.cfg
new file mode 100644
index 0000000..edd009c
--- /dev/null
+++ b/meta-gbs/recipes-kernel/linux/linux-nuvoton/gbs.cfg
@@ -0,0 +1,110 @@
+# Support full 1G memory for userspace on BMC
+CONFIG_VMSPLIT_3G_OPT=y
+CONFIG_NET_NCSI=y
+# Enable available sensors
+CONFIG_HWMON=y
+CONFIG_PMBUS=y
+CONFIG_SENSORS_PMBUS=y
+CONFIG_SENSORS_MAX34440=y
+CONFIG_SENSORS_LM75=y
+CONFIG_SENSORS_SBTSI=y
+CONFIG_SENSORS_ISL68137=y
+CONFIG_SENSORS_ADM1275=y
+CONFIG_NPCM7XX_ADC=y
+CONFIG_SENSORS_IIO_HWMON=y
+CONFIG_SENSORS_FAN=y
+CONFIG_SENSORS_JC42=y
+CONFIG_SENSORS_MAX31790=y
+CONFIG_SENSORS_UCD9000=y
+
+# Enable for firmware update LPC.
+CONFIG_DEVMEM=y
+
+# Enable seven seg display
+CONFIG_SEVEN_SEGMENT_DISPLAY=y
+CONFIG_SEVEN_SEGMENT_GPIO=y
+
+# Enable GPIO LEDS
+CONFIG_NEW_LEDS=y
+CONFIG_LEDS_CLASS=y
+CONFIG_LEDS_GPIO=y
+CONFIG_LEDS_TRIGGERS=y
+CONFIG_LEDS_TRIGGER_TIMER=y // Allow userspace to blink LEDs
+CONFIG_LEDS_TRIGGER_PANIC=y // Blink BMC fault when kernel panics
+CONFIG_LEDS_TRIGGER_DEFAULT_ON=y
+CONFIG_LEDS_TRIGGER_HEARTBEAT=y
+
+# Enable pstore(ramoops) to capture kernel panics
+CONFIG_PSTORE=y
+CONFIG_PSTORE_RAM=y
+CONFIG_PSTORE_DEFLATE_COMPRESS=y
+
+# Enable Nuvoton ECC
+CONFIG_EDAC_ATOMIC_SCRUB=y
+CONFIG_EDAC_DEBUG=y
+CONFIG_EDAC_LEGACY_SYSFS=y
+CONFIG_EDAC_NPCM7XX=y
+CONFIG_EDAC_SUPPORT=y
+CONFIG_EDAC=y
+CONFIG_RAS=y
+
+# Enable Nuvoton JTAG
+CONFIG_NPCM7XX_JTAG_MASTER=y
+
+# USB
+CONFIG_USB_CONFIGFS_ECM_SUBSET=y
+CONFIG_USB_CONFIGFS_ECM=y
+CONFIG_USB_CONFIGFS_EEM=y
+CONFIG_USB_CONFIGFS_F_HID=y
+CONFIG_USB_CONFIGFS_MASS_STORAGE=y
+CONFIG_USB_CONFIGFS_RNDIS=y
+CONFIG_USB_CONFIGFS=y
+CONFIG_USB_F_ECM=y
+CONFIG_USB_F_EEM=y
+CONFIG_USB_F_MASS_STORAGE=y
+CONFIG_USB_F_RNDIS=y
+CONFIG_USB_F_SUBSET=y
+CONFIG_USB_GADGET_NPCM_USB2=y
+CONFIG_USB_NPCM_UDC=y
+CONFIG_USB_OHCI_HCD_NPCM7XX=y
+CONFIG_USB_SERIAL_CP210X=y
+CONFIG_USB_U_ETHER=y
+
+#SPI
+CONFIG_SPI=y
+CONFIG_SPI_NPCM_FIU=y
+CONFIG_SPI_NPCM_PSPI=y
+
+#I2C support
+CONFIG_I2C_MUX_LTC4306=y
+CONFIG_I2C_MUX_PCA954x=y
+CONFIG_I2C_MUX=y
+CONFIG_I2C_SLAVE_EEPROM=y
+CONFIG_I2C_SLAVE_MQUEUE=y
+CONFIG_I2C_SLAVE=y
+
+#I2C GPIO expanders
+CONFIG_GPIO_PCA953X_IRQ=y
+CONFIG_GPIO_PCA953X=y
+CONFIG_GPIO_PCF857X=y
+
+# Misc
+CONFIG_OVERLAY_FS=y
+CONFIG_JFFS2_FS=y
+CONFIG_SQUASHFS_XZ=y
+CONFIG_SQUASHFS=y
+CONFIG_RESET_CONTROLLER=y
+CONFIG_RESET_NPCM=y
+CONFIG_IPVLAN=y
+CONFIG_VLAN_8021Q=y
+CONFIG_DEVKMEM=y
+CONFIG_EEPROM_AT24=y
+CONFIG_FORCE_MAX_ZONEORDER=12
+CONFIG_IIO_MUX=y
+CONFIG_IIO=y
+CONFIG_MEDIA_SUPPORT=y
+CONFIG_MFD_SYSCON=y
+CONFIG_MTD_M25P80=y
+CONFIG_MUX_MMIO=y
+CONFIG_NPCM7XX_LPC_BPC=y
+CONFIG_MTD_PARTITIONED_MASTER=y