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-rw-r--r--drivers/mfd/khadas-mcu.c142
1 files changed, 142 insertions, 0 deletions
diff --git a/drivers/mfd/khadas-mcu.c b/drivers/mfd/khadas-mcu.c
new file mode 100644
index 000000000000..44d5bb462dab
--- /dev/null
+++ b/drivers/mfd/khadas-mcu.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Khadas System control Microcontroller
+ *
+ * Copyright (C) 2020 BayLibre SAS
+ *
+ * Author(s): Neil Armstrong <narmstrong@baylibre.com>
+ */
+#include <linux/bitfield.h>
+#include <linux/i2c.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/khadas-mcu.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+static bool khadas_mcu_reg_volatile(struct device *dev, unsigned int reg)
+{
+ if (reg >= KHADAS_MCU_USER_DATA_0_REG &&
+ reg < KHADAS_MCU_PWR_OFF_CMD_REG)
+ return true;
+
+ switch (reg) {
+ case KHADAS_MCU_PWR_OFF_CMD_REG:
+ case KHADAS_MCU_PASSWD_START_REG:
+ case KHADAS_MCU_CHECK_VEN_PASSWD_REG:
+ case KHADAS_MCU_CHECK_USER_PASSWD_REG:
+ case KHADAS_MCU_WOL_INIT_START_REG:
+ case KHADAS_MCU_CMD_FAN_STATUS_CTRL_REG:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool khadas_mcu_reg_writeable(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case KHADAS_MCU_PASSWD_VEN_0_REG:
+ case KHADAS_MCU_PASSWD_VEN_1_REG:
+ case KHADAS_MCU_PASSWD_VEN_2_REG:
+ case KHADAS_MCU_PASSWD_VEN_3_REG:
+ case KHADAS_MCU_PASSWD_VEN_4_REG:
+ case KHADAS_MCU_PASSWD_VEN_5_REG:
+ case KHADAS_MCU_MAC_0_REG:
+ case KHADAS_MCU_MAC_1_REG:
+ case KHADAS_MCU_MAC_2_REG:
+ case KHADAS_MCU_MAC_3_REG:
+ case KHADAS_MCU_MAC_4_REG:
+ case KHADAS_MCU_MAC_5_REG:
+ case KHADAS_MCU_USID_0_REG:
+ case KHADAS_MCU_USID_1_REG:
+ case KHADAS_MCU_USID_2_REG:
+ case KHADAS_MCU_USID_3_REG:
+ case KHADAS_MCU_USID_4_REG:
+ case KHADAS_MCU_USID_5_REG:
+ case KHADAS_MCU_VERSION_0_REG:
+ case KHADAS_MCU_VERSION_1_REG:
+ case KHADAS_MCU_DEVICE_NO_0_REG:
+ case KHADAS_MCU_DEVICE_NO_1_REG:
+ case KHADAS_MCU_FACTORY_TEST_REG:
+ case KHADAS_MCU_SHUTDOWN_NORMAL_STATUS_REG:
+ return false;
+ default:
+ return true;
+ }
+}
+
+static const struct regmap_config khadas_mcu_regmap_config = {
+ .reg_bits = 8,
+ .reg_stride = 1,
+ .val_bits = 8,
+ .max_register = KHADAS_MCU_CMD_FAN_STATUS_CTRL_REG,
+ .volatile_reg = khadas_mcu_reg_volatile,
+ .writeable_reg = khadas_mcu_reg_writeable,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static struct mfd_cell khadas_mcu_fan_cells[] = {
+ /* VIM1/2 Rev13+ and VIM3 only */
+ { .name = "khadas-mcu-fan-ctrl", },
+};
+
+static struct mfd_cell khadas_mcu_cells[] = {
+ { .name = "khadas-mcu-user-mem", },
+};
+
+static int khadas_mcu_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct khadas_mcu *ddata;
+ int ret;
+
+ ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
+ if (!ddata)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, ddata);
+
+ ddata->dev = dev;
+
+ ddata->regmap = devm_regmap_init_i2c(client, &khadas_mcu_regmap_config);
+ if (IS_ERR(ddata->regmap)) {
+ ret = PTR_ERR(ddata->regmap);
+ dev_err(dev, "Failed to allocate register map: %d\n", ret);
+ return ret;
+ }
+
+ ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
+ khadas_mcu_cells,
+ ARRAY_SIZE(khadas_mcu_cells),
+ NULL, 0, NULL);
+ if (ret)
+ return ret;
+
+ if (of_find_property(dev->of_node, "#cooling-cells", NULL))
+ return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
+ khadas_mcu_fan_cells,
+ ARRAY_SIZE(khadas_mcu_fan_cells),
+ NULL, 0, NULL);
+
+ return 0;
+}
+
+static const struct of_device_id khadas_mcu_of_match[] = {
+ { .compatible = "khadas,mcu", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, khadas_mcu_of_match);
+
+static struct i2c_driver khadas_mcu_driver = {
+ .driver = {
+ .name = "khadas-mcu-core",
+ .of_match_table = of_match_ptr(khadas_mcu_of_match),
+ },
+ .probe = khadas_mcu_probe,
+};
+module_i2c_driver(khadas_mcu_driver);
+
+MODULE_DESCRIPTION("Khadas MCU core driver");
+MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
+MODULE_LICENSE("GPL v2");