1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0+
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2020 Linaro Limited.
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <common.h>
7*4882a593Smuzhiyun #include <dm.h>
8*4882a593Smuzhiyun #include <dm/device.h>
9*4882a593Smuzhiyun #include <errno.h>
10*4882a593Smuzhiyun #include <scmi_agent-uclass.h>
11*4882a593Smuzhiyun #include <scmi_protocols.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <dm/device-internal.h>
14*4882a593Smuzhiyun #include <linux/compat.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun /**
17*4882a593Smuzhiyun * struct error_code - Helper structure for SCMI error code conversion
18*4882a593Smuzhiyun * @scmi: SCMI error code
19*4882a593Smuzhiyun * @errno: Related standard error number
20*4882a593Smuzhiyun */
21*4882a593Smuzhiyun struct error_code {
22*4882a593Smuzhiyun int scmi;
23*4882a593Smuzhiyun int errno;
24*4882a593Smuzhiyun };
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun static const struct error_code scmi_linux_errmap[] = {
27*4882a593Smuzhiyun { .scmi = SCMI_NOT_SUPPORTED, .errno = -EOPNOTSUPP, },
28*4882a593Smuzhiyun { .scmi = SCMI_INVALID_PARAMETERS, .errno = -EINVAL, },
29*4882a593Smuzhiyun { .scmi = SCMI_DENIED, .errno = -EACCES, },
30*4882a593Smuzhiyun { .scmi = SCMI_NOT_FOUND, .errno = -ENOENT, },
31*4882a593Smuzhiyun { .scmi = SCMI_OUT_OF_RANGE, .errno = -ERANGE, },
32*4882a593Smuzhiyun { .scmi = SCMI_BUSY, .errno = -EBUSY, },
33*4882a593Smuzhiyun { .scmi = SCMI_COMMS_ERROR, .errno = -ECOMM, },
34*4882a593Smuzhiyun { .scmi = SCMI_GENERIC_ERROR, .errno = -EIO, },
35*4882a593Smuzhiyun { .scmi = SCMI_HARDWARE_ERROR, .errno = -EREMOTEIO, },
36*4882a593Smuzhiyun { .scmi = SCMI_PROTOCOL_ERROR, .errno = -EPROTO, },
37*4882a593Smuzhiyun };
38*4882a593Smuzhiyun
scmi_to_linux_errno(s32 scmi_code)39*4882a593Smuzhiyun int scmi_to_linux_errno(s32 scmi_code)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun int n;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun if (!scmi_code)
44*4882a593Smuzhiyun return 0;
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun for (n = 0; n < ARRAY_SIZE(scmi_linux_errmap); n++)
47*4882a593Smuzhiyun if (scmi_code == scmi_linux_errmap[n].scmi)
48*4882a593Smuzhiyun return scmi_linux_errmap[1].errno;
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun return -EPROTO;
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun /*
54*4882a593Smuzhiyun * SCMI agent devices binds devices of various uclasses depeding on
55*4882a593Smuzhiyun * the FDT description. scmi_bind_protocol() is a generic bind sequence
56*4882a593Smuzhiyun * called by the uclass at bind stage, that is uclass post_bind.
57*4882a593Smuzhiyun */
scmi_bind_protocols(struct udevice * dev)58*4882a593Smuzhiyun static int scmi_bind_protocols(struct udevice *dev)
59*4882a593Smuzhiyun {
60*4882a593Smuzhiyun int ret = 0;
61*4882a593Smuzhiyun ofnode node;
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun dev_for_each_subnode(node, dev) {
64*4882a593Smuzhiyun struct driver *drv = NULL;
65*4882a593Smuzhiyun u32 protocol_id;
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun if (!ofnode_is_available(node))
68*4882a593Smuzhiyun continue;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun if (ofnode_read_u32(node, "reg", &protocol_id))
71*4882a593Smuzhiyun continue;
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun switch (protocol_id) {
74*4882a593Smuzhiyun case SCMI_PROTOCOL_ID_CLOCK:
75*4882a593Smuzhiyun if (IS_ENABLED(CONFIG_CLK_SCMI))
76*4882a593Smuzhiyun drv = DM_GET_DRIVER(scmi_clock);
77*4882a593Smuzhiyun break;
78*4882a593Smuzhiyun case SCMI_PROTOCOL_ID_RESET_DOMAIN:
79*4882a593Smuzhiyun if (IS_ENABLED(CONFIG_RESET_SCMI))
80*4882a593Smuzhiyun drv = DM_GET_DRIVER(scmi_reset_domain);
81*4882a593Smuzhiyun break;
82*4882a593Smuzhiyun default:
83*4882a593Smuzhiyun break;
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun if (!drv) {
87*4882a593Smuzhiyun dev_dbg(dev, "Ignore unsupported SCMI protocol %#x\n",
88*4882a593Smuzhiyun protocol_id);
89*4882a593Smuzhiyun continue;
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun ret = device_bind_with_driver_data(dev, drv,
93*4882a593Smuzhiyun ofnode_get_name(node), 0, node, NULL);
94*4882a593Smuzhiyun if (ret)
95*4882a593Smuzhiyun break;
96*4882a593Smuzhiyun }
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun return ret;
100*4882a593Smuzhiyun }
101*4882a593Smuzhiyun
transport_dev_ops(struct udevice * dev)102*4882a593Smuzhiyun static const struct scmi_agent_ops *transport_dev_ops(struct udevice *dev)
103*4882a593Smuzhiyun {
104*4882a593Smuzhiyun return (const struct scmi_agent_ops *)dev->driver->ops;
105*4882a593Smuzhiyun }
106*4882a593Smuzhiyun
devm_scmi_process_msg(struct udevice * dev,struct scmi_msg * msg)107*4882a593Smuzhiyun int devm_scmi_process_msg(struct udevice *dev, struct scmi_msg *msg)
108*4882a593Smuzhiyun {
109*4882a593Smuzhiyun const struct scmi_agent_ops *ops = transport_dev_ops(dev);
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun if (ops->process_msg)
112*4882a593Smuzhiyun return ops->process_msg(dev, msg);
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun return -EPROTONOSUPPORT;
115*4882a593Smuzhiyun }
116*4882a593Smuzhiyun
117*4882a593Smuzhiyun UCLASS_DRIVER(scmi_agent) = {
118*4882a593Smuzhiyun .id = UCLASS_SCMI_AGENT,
119*4882a593Smuzhiyun .name = "scmi_agent",
120*4882a593Smuzhiyun .post_bind = scmi_bind_protocols,
121*4882a593Smuzhiyun };
122