sm-lmm.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Copyright 2025 NXP
 4 */
 5
 6#include <linux/firmware/imx/sm.h>
 7#include <linux/module.h>
 8#include <linux/of.h>
 9#include <linux/platform_device.h>
10#include <linux/scmi_protocol.h>
11#include <linux/scmi_imx_protocol.h>
12
13static const struct scmi_imx_lmm_proto_ops *imx_lmm_ops;
14static struct scmi_protocol_handle *ph;
15
16int scmi_imx_lmm_info(u32 lmid, struct scmi_imx_lmm_info *info)
17{
18	if (!ph)
19		return -EPROBE_DEFER;
20
21	if (!info)
22		return -EINVAL;
23
24	return imx_lmm_ops->lmm_info(ph, lmid, info);
25};
26EXPORT_SYMBOL(scmi_imx_lmm_info);
27
28int scmi_imx_lmm_reset_vector_set(u32 lmid, u32 cpuid, u32 flags, u64 vector)
29{
30	if (!ph)
31		return -EPROBE_DEFER;
32
33	return imx_lmm_ops->lmm_reset_vector_set(ph, lmid, cpuid, flags, vector);
34}
35EXPORT_SYMBOL(scmi_imx_lmm_reset_vector_set);
36
37int scmi_imx_lmm_operation(u32 lmid, enum scmi_imx_lmm_op op, u32 flags)
38{
39	if (!ph)
40		return -EPROBE_DEFER;
41
42	switch (op) {
43	case SCMI_IMX_LMM_BOOT:
44		return imx_lmm_ops->lmm_power_boot(ph, lmid, true);
45	case SCMI_IMX_LMM_POWER_ON:
46		return imx_lmm_ops->lmm_power_boot(ph, lmid, false);
47	case SCMI_IMX_LMM_SHUTDOWN:
48		return imx_lmm_ops->lmm_shutdown(ph, lmid, flags);
49	default:
50		break;
51	}
52
53	return -EINVAL;
54}
55EXPORT_SYMBOL(scmi_imx_lmm_operation);
56
57static int scmi_imx_lmm_probe(struct scmi_device *sdev)
58{
59	const struct scmi_handle *handle = sdev->handle;
60
61	if (!handle)
62		return -ENODEV;
63
64	if (imx_lmm_ops) {
65		dev_err(&sdev->dev, "lmm already initialized\n");
66		return -EEXIST;
67	}
68
69	imx_lmm_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_IMX_LMM, &ph);
70	if (IS_ERR(imx_lmm_ops))
71		return PTR_ERR(imx_lmm_ops);
72
73	return 0;
74}
75
76static const struct scmi_device_id scmi_id_table[] = {
77	{ SCMI_PROTOCOL_IMX_LMM, "imx-lmm" },
78	{ },
79};
80MODULE_DEVICE_TABLE(scmi, scmi_id_table);
81
82static struct scmi_driver scmi_imx_lmm_driver = {
83	.name = "scmi-imx-lmm",
84	.probe = scmi_imx_lmm_probe,
85	.id_table = scmi_id_table,
86};
87module_scmi_driver(scmi_imx_lmm_driver);
88
89MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
90MODULE_DESCRIPTION("IMX SM LMM driver");
91MODULE_LICENSE("GPL");