diff options
Diffstat (limited to 'drivers/reset/reset-eic7700-hsp.c')
| -rw-r--r-- | drivers/reset/reset-eic7700-hsp.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/drivers/reset/reset-eic7700-hsp.c b/drivers/reset/reset-eic7700-hsp.c new file mode 100644 index 000000000..1575ee4a2 --- /dev/null +++ b/drivers/reset/reset-eic7700-hsp.c @@ -0,0 +1,113 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2026, Beijing ESWIN Computing Technology Co., Ltd.. + * All rights reserved. + * + * ESWIN EIC7700 HSP Reset Driver + * + * Authors: Xuyang Dong <dongxuyang@eswincomputing.com> + */ + +#include <linux/auxiliary_bus.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/reset-controller.h> + +#include <dt-bindings/reset/eswin,eic7700-hspcrg.h> + +/** + * struct eic7700_hsp_reset_data - reset controller information structure + * @rcdev: reset controller entity + * @regmap: regmap handle containing the memory-mapped reset registers + */ +struct eic7700_hsp_reset_data { + struct reset_controller_dev rcdev; + struct regmap *regmap; +}; + +struct eic7700_hsp_reg { + u32 reg; + u32 bit; + bool active_low; +}; + +static inline struct eic7700_hsp_reset_data * +to_eic7700_hsp_reset(struct reset_controller_dev *rcdev) +{ + return container_of(rcdev, struct eic7700_hsp_reset_data, rcdev); +} + +static const struct eic7700_hsp_reg eic7700_hsp_reset[] = { + [EIC7700_HSP_RST_SATA_P0] = {0x340, BIT(0), false}, + [EIC7700_HSP_RST_SATA_PHY] = {0x340, BIT(1), false}, + [EIC7700_HSP_RST_USB0] = {0x800, BIT(24), true}, + [EIC7700_HSP_RST_USB1] = {0x900, BIT(24), true}, + [EIC7700_HSP_RST_USB0_PHY] = {0x800, BIT(25), false}, + [EIC7700_HSP_RST_USB1_PHY] = {0x900, BIT(25), false}, +}; + +static int eic7700_hsp_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct eic7700_hsp_reset_data *data = to_eic7700_hsp_reset(rcdev); + + return regmap_assign_bits(data->regmap, eic7700_hsp_reset[id].reg, + eic7700_hsp_reset[id].bit, + !eic7700_hsp_reset[id].active_low); +} + +static int eic7700_hsp_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct eic7700_hsp_reset_data *data = to_eic7700_hsp_reset(rcdev); + + return regmap_assign_bits(data->regmap, eic7700_hsp_reset[id].reg, + eic7700_hsp_reset[id].bit, + eic7700_hsp_reset[id].active_low); +} + +static const struct reset_control_ops eic7700_hsp_reset_ops = { + .assert = eic7700_hsp_reset_assert, + .deassert = eic7700_hsp_reset_deassert, +}; + +static int eic7700_hsp_reset_probe(struct auxiliary_device *adev, + const struct auxiliary_device_id *id) +{ + struct eic7700_hsp_reset_data *data; + struct device *dev = &adev->dev; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->regmap = dev_get_regmap(dev->parent, NULL); + if (!data->regmap) + return dev_err_probe(dev, -ENODEV, "failed to get regmap!\n"); + + data->rcdev.owner = THIS_MODULE; + data->rcdev.ops = &eic7700_hsp_reset_ops; + data->rcdev.of_node = dev->parent->of_node; + data->rcdev.dev = dev; + data->rcdev.nr_resets = ARRAY_SIZE(eic7700_hsp_reset); + + return devm_reset_controller_register(dev, &data->rcdev); +} + +static const struct auxiliary_device_id eic7700_hsp_reset_ids[] = { + { .name = "clk_eic7700_hsp.hsp-reset", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(auxiliary, eic7700_hsp_reset_ids); + +static struct auxiliary_driver eic7700_hsp_reset_driver = { + .probe = eic7700_hsp_reset_probe, + .id_table = eic7700_hsp_reset_ids, +}; + +module_auxiliary_driver(eic7700_hsp_reset_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Xuyang Dong <dongxuyang@eswincomputing.com>"); +MODULE_DESCRIPTION("ESWIN EIC7700 HSP Reset Controller Driver"); |