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This Microcontroller is present on the Khadas VIM1, VIM2, VIM3 and Edge boards. It has multiple boot control features like password check, power-on options, power-off control and system FAN control on recent boards. This implements a very basic MFD driver with the fan control and User NVMEM cells. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Driver for Khadas System control Microcontroller
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*
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* Copyright (C) 2020 BayLibre SAS
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*
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* Author(s): Neil Armstrong <narmstrong@baylibre.com>
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*/
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#include <linux/bitfield.h>
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#include <linux/i2c.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/khadas-mcu.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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static bool khadas_mcu_reg_volatile(struct device *dev, unsigned int reg)
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{
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if (reg >= KHADAS_MCU_USER_DATA_0_REG &&
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reg < KHADAS_MCU_PWR_OFF_CMD_REG)
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return true;
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switch (reg) {
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case KHADAS_MCU_PWR_OFF_CMD_REG:
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case KHADAS_MCU_PASSWD_START_REG:
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case KHADAS_MCU_CHECK_VEN_PASSWD_REG:
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case KHADAS_MCU_CHECK_USER_PASSWD_REG:
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case KHADAS_MCU_WOL_INIT_START_REG:
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case KHADAS_MCU_CMD_FAN_STATUS_CTRL_REG:
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return true;
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default:
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return false;
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}
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}
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static bool khadas_mcu_reg_writeable(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case KHADAS_MCU_PASSWD_VEN_0_REG:
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case KHADAS_MCU_PASSWD_VEN_1_REG:
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case KHADAS_MCU_PASSWD_VEN_2_REG:
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case KHADAS_MCU_PASSWD_VEN_3_REG:
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case KHADAS_MCU_PASSWD_VEN_4_REG:
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case KHADAS_MCU_PASSWD_VEN_5_REG:
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case KHADAS_MCU_MAC_0_REG:
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case KHADAS_MCU_MAC_1_REG:
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case KHADAS_MCU_MAC_2_REG:
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case KHADAS_MCU_MAC_3_REG:
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case KHADAS_MCU_MAC_4_REG:
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case KHADAS_MCU_MAC_5_REG:
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case KHADAS_MCU_USID_0_REG:
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case KHADAS_MCU_USID_1_REG:
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case KHADAS_MCU_USID_2_REG:
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case KHADAS_MCU_USID_3_REG:
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case KHADAS_MCU_USID_4_REG:
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case KHADAS_MCU_USID_5_REG:
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case KHADAS_MCU_VERSION_0_REG:
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case KHADAS_MCU_VERSION_1_REG:
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case KHADAS_MCU_DEVICE_NO_0_REG:
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case KHADAS_MCU_DEVICE_NO_1_REG:
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case KHADAS_MCU_FACTORY_TEST_REG:
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case KHADAS_MCU_SHUTDOWN_NORMAL_STATUS_REG:
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return false;
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default:
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return true;
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}
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}
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static const struct regmap_config khadas_mcu_regmap_config = {
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.reg_bits = 8,
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.reg_stride = 1,
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.val_bits = 8,
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.max_register = KHADAS_MCU_CMD_FAN_STATUS_CTRL_REG,
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.volatile_reg = khadas_mcu_reg_volatile,
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.writeable_reg = khadas_mcu_reg_writeable,
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.cache_type = REGCACHE_RBTREE,
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};
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static struct mfd_cell khadas_mcu_fan_cells[] = {
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/* VIM1/2 Rev13+ and VIM3 only */
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{ .name = "khadas-mcu-fan-ctrl", },
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};
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static struct mfd_cell khadas_mcu_cells[] = {
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{ .name = "khadas-mcu-user-mem", },
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};
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static int khadas_mcu_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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struct khadas_mcu *ddata;
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int ret;
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ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
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if (!ddata)
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return -ENOMEM;
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i2c_set_clientdata(client, ddata);
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ddata->dev = dev;
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ddata->regmap = devm_regmap_init_i2c(client, &khadas_mcu_regmap_config);
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if (IS_ERR(ddata->regmap)) {
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ret = PTR_ERR(ddata->regmap);
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dev_err(dev, "Failed to allocate register map: %d\n", ret);
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return ret;
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}
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ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
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khadas_mcu_cells,
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ARRAY_SIZE(khadas_mcu_cells),
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NULL, 0, NULL);
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if (ret)
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return ret;
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if (of_find_property(dev->of_node, "#cooling-cells", NULL))
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return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
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khadas_mcu_fan_cells,
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ARRAY_SIZE(khadas_mcu_fan_cells),
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NULL, 0, NULL);
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return 0;
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}
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static const struct of_device_id khadas_mcu_of_match[] = {
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{ .compatible = "khadas,mcu", },
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{},
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};
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MODULE_DEVICE_TABLE(of, khadas_mcu_of_match);
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static struct i2c_driver khadas_mcu_driver = {
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.driver = {
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.name = "khadas-mcu-core",
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.of_match_table = of_match_ptr(khadas_mcu_of_match),
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},
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.probe = khadas_mcu_probe,
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};
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module_i2c_driver(khadas_mcu_driver);
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MODULE_DESCRIPTION("Khadas MCU core driver");
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MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
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MODULE_LICENSE("GPL v2");
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