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144 lines
3.6 KiB
144 lines
3.6 KiB
// 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 <[email protected]> |
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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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#ifdef CONFIG_OF |
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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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#endif |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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