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0008 #include <linux/module.h>
0009 #include <linux/of.h>
0010 #include <linux/device.h>
0011 #include <linux/reset-controller.h>
0012 #include <linux/scmi_protocol.h>
0013
0014 static const struct scmi_reset_proto_ops *reset_ops;
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0018
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0020
0021 struct scmi_reset_data {
0022 struct reset_controller_dev rcdev;
0023 const struct scmi_protocol_handle *ph;
0024 };
0025
0026 #define to_scmi_reset_data(p) container_of((p), struct scmi_reset_data, rcdev)
0027 #define to_scmi_handle(p) (to_scmi_reset_data(p)->ph)
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0039 static int
0040 scmi_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
0041 {
0042 const struct scmi_protocol_handle *ph = to_scmi_handle(rcdev);
0043
0044 return reset_ops->assert(ph, id);
0045 }
0046
0047
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0049
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0056
0057 static int
0058 scmi_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
0059 {
0060 const struct scmi_protocol_handle *ph = to_scmi_handle(rcdev);
0061
0062 return reset_ops->deassert(ph, id);
0063 }
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0074
0075 static int
0076 scmi_reset_reset(struct reset_controller_dev *rcdev, unsigned long id)
0077 {
0078 const struct scmi_protocol_handle *ph = to_scmi_handle(rcdev);
0079
0080 return reset_ops->reset(ph, id);
0081 }
0082
0083 static const struct reset_control_ops scmi_reset_ops = {
0084 .assert = scmi_reset_assert,
0085 .deassert = scmi_reset_deassert,
0086 .reset = scmi_reset_reset,
0087 };
0088
0089 static int scmi_reset_probe(struct scmi_device *sdev)
0090 {
0091 struct scmi_reset_data *data;
0092 struct device *dev = &sdev->dev;
0093 struct device_node *np = dev->of_node;
0094 const struct scmi_handle *handle = sdev->handle;
0095 struct scmi_protocol_handle *ph;
0096
0097 if (!handle)
0098 return -ENODEV;
0099
0100 reset_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_RESET, &ph);
0101 if (IS_ERR(reset_ops))
0102 return PTR_ERR(reset_ops);
0103
0104 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
0105 if (!data)
0106 return -ENOMEM;
0107
0108 data->rcdev.ops = &scmi_reset_ops;
0109 data->rcdev.owner = THIS_MODULE;
0110 data->rcdev.of_node = np;
0111 data->rcdev.nr_resets = reset_ops->num_domains_get(ph);
0112 data->ph = ph;
0113
0114 return devm_reset_controller_register(dev, &data->rcdev);
0115 }
0116
0117 static const struct scmi_device_id scmi_id_table[] = {
0118 { SCMI_PROTOCOL_RESET, "reset" },
0119 { },
0120 };
0121 MODULE_DEVICE_TABLE(scmi, scmi_id_table);
0122
0123 static struct scmi_driver scmi_reset_driver = {
0124 .name = "scmi-reset",
0125 .probe = scmi_reset_probe,
0126 .id_table = scmi_id_table,
0127 };
0128 module_scmi_driver(scmi_reset_driver);
0129
0130 MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
0131 MODULE_DESCRIPTION("ARM SCMI reset controller driver");
0132 MODULE_LICENSE("GPL v2");