^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * ARM System Control and Management Interface (ARM SCMI) reset driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2019-2020 ARM Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/reset-controller.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/scmi_protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static const struct scmi_reset_proto_ops *reset_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * struct scmi_reset_data - reset controller information structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * @rcdev: reset controller entity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * @ph: ARM SCMI protocol handle used for communication with system controller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct scmi_reset_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct reset_controller_dev rcdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) const struct scmi_protocol_handle *ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define to_scmi_reset_data(p) container_of((p), struct scmi_reset_data, rcdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define to_scmi_handle(p) (to_scmi_reset_data(p)->ph)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * scmi_reset_assert() - assert device reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * @rcdev: reset controller entity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * @id: ID of the reset to be asserted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * This function implements the reset driver op to assert a device's reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * using the ARM SCMI protocol.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * Return: 0 for successful request, else a corresponding error value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) scmi_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) const struct scmi_protocol_handle *ph = to_scmi_handle(rcdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) return reset_ops->assert(ph, id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * scmi_reset_deassert() - deassert device reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * @rcdev: reset controller entity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * @id: ID of the reset to be deasserted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * This function implements the reset driver op to deassert a device's reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * using the ARM SCMI protocol.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * Return: 0 for successful request, else a corresponding error value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) scmi_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) const struct scmi_protocol_handle *ph = to_scmi_handle(rcdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return reset_ops->deassert(ph, id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * scmi_reset_reset() - reset the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * @rcdev: reset controller entity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * @id: ID of the reset signal to be reset(assert + deassert)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * This function implements the reset driver op to trigger a device's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * reset signal using the ARM SCMI protocol.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * Return: 0 for successful request, else a corresponding error value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) scmi_reset_reset(struct reset_controller_dev *rcdev, unsigned long id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) const struct scmi_protocol_handle *ph = to_scmi_handle(rcdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return reset_ops->reset(ph, id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static const struct reset_control_ops scmi_reset_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) .assert = scmi_reset_assert,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) .deassert = scmi_reset_deassert,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) .reset = scmi_reset_reset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static int scmi_reset_probe(struct scmi_device *sdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) struct scmi_reset_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) struct device *dev = &sdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) struct device_node *np = dev->of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) const struct scmi_handle *handle = sdev->handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct scmi_protocol_handle *ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (!handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) reset_ops = handle->devm_get_protocol(sdev, SCMI_PROTOCOL_RESET, &ph);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (IS_ERR(reset_ops))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return PTR_ERR(reset_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) data->rcdev.ops = &scmi_reset_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) data->rcdev.owner = THIS_MODULE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) data->rcdev.of_node = np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) data->rcdev.nr_resets = reset_ops->num_domains_get(ph);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) data->ph = ph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return devm_reset_controller_register(dev, &data->rcdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static const struct scmi_device_id scmi_id_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) { SCMI_PROTOCOL_RESET, "reset" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) { },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) MODULE_DEVICE_TABLE(scmi, scmi_id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static struct scmi_driver scmi_reset_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) .name = "scmi-reset",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) .probe = scmi_reset_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) .id_table = scmi_id_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) module_scmi_driver(scmi_reset_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) MODULE_DESCRIPTION("ARM SCMI reset controller driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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