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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133// SPDX-License-Identifier: GPL-2.0/* * ARM System Control and Management Interface (ARM SCMI) reset driver * * Copyright (C) 2019-2021 ARM Ltd. */
#include <linux/module.h>#include <linux/of.h>#include <linux/device.h>#include <linux/reset-controller.h>#include <linux/scmi_protocol.h>
static const struct scmi_reset_proto_ops *reset_ops;
/** * struct scmi_reset_data - reset controller information structure * @rcdev: reset controller entity * @ph: ARM SCMI protocol handle used for communication with system controller */struct scmi_reset_data { struct reset_controller_dev rcdev; const struct scmi_protocol_handle *ph;};
#define to_scmi_reset_data(p) container_of((p), struct scmi_reset_data, rcdev)#define to_scmi_handle(p) (to_scmi_reset_data(p)->ph)
/** * scmi_reset_assert() - assert device reset * @rcdev: reset controller entity * @id: ID of the reset to be asserted * * This function implements the reset driver op to assert a device's reset * using the ARM SCMI protocol. * * Return: 0 for successful request, else a corresponding error value */static intscmi_reset_assert(struct reset_controller_dev *rcdev, unsigned long id){ const struct scmi_protocol_handle *ph = to_scmi_handle(rcdev);
return reset_ops->assert(ph, id);}
/** * scmi_reset_deassert() - deassert device reset * @rcdev: reset controller entity * @id: ID of the reset to be deasserted * * This function implements the reset driver op to deassert a device's reset * using the ARM SCMI protocol. * * Return: 0 for successful request, else a corresponding error value */static intscmi_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id){ const struct scmi_protocol_handle *ph = to_scmi_handle(rcdev);
return reset_ops->deassert(ph, id);}
/** * scmi_reset_reset() - reset the device * @rcdev: reset controller entity * @id: ID of the reset signal to be reset(assert + deassert) * * This function implements the reset driver op to trigger a device's * reset signal using the ARM SCMI protocol. * * Return: 0 for successful request, else a corresponding error value */static intscmi_reset_reset(struct reset_controller_dev *rcdev, unsigned long id){ const struct scmi_protocol_handle *ph = to_scmi_handle(rcdev);
return reset_ops->reset(ph, id);}
static const struct reset_control_ops scmi_reset_ops = { .assert = scmi_reset_assert, .deassert = scmi_reset_deassert, .reset = scmi_reset_reset,};
static int scmi_reset_probe(struct scmi_device *sdev){ struct scmi_reset_data *data; struct device *dev = &sdev->dev; struct device_node *np = dev->of_node; const struct scmi_handle *handle = sdev->handle; struct scmi_protocol_handle *ph;
if (!handle) return -ENODEV;
reset_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_RESET, &ph); if (IS_ERR(reset_ops)) return PTR_ERR(reset_ops);
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM;
data->rcdev.ops = &scmi_reset_ops; data->rcdev.owner = THIS_MODULE; data->rcdev.of_node = np; data->rcdev.nr_resets = reset_ops->num_domains_get(ph); data->ph = ph;
return devm_reset_controller_register(dev, &data->rcdev);}
static const struct scmi_device_id scmi_id_table[] = { { SCMI_PROTOCOL_RESET, "reset" }, { },};MODULE_DEVICE_TABLE(scmi, scmi_id_table);
static struct scmi_driver scmi_reset_driver = { .name = "scmi-reset", .probe = scmi_reset_probe, .id_table = scmi_id_table,};module_scmi_driver(scmi_reset_driver);
MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");MODULE_DESCRIPTION("ARM SCMI reset controller driver");MODULE_LICENSE("GPL v2");