1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2016, NVIDIA CORPORATION.
4 */
5
6 #include <common.h>
7 #include <dm.h>
8 #include <mailbox.h>
9 #include <mailbox-uclass.h>
10
mbox_dev_ops(struct udevice * dev)11 static inline struct mbox_ops *mbox_dev_ops(struct udevice *dev)
12 {
13 return (struct mbox_ops *)dev->driver->ops;
14 }
15
mbox_of_xlate_default(struct mbox_chan * chan,struct ofnode_phandle_args * args)16 static int mbox_of_xlate_default(struct mbox_chan *chan,
17 struct ofnode_phandle_args *args)
18 {
19 debug("%s(chan=%p)\n", __func__, chan);
20
21 if (args->args_count != 1) {
22 debug("Invaild args_count: %d\n", args->args_count);
23 return -EINVAL;
24 }
25
26 chan->id = args->args[0];
27
28 return 0;
29 }
30
mbox_get_by_index(struct udevice * dev,int index,struct mbox_chan * chan)31 int mbox_get_by_index(struct udevice *dev, int index, struct mbox_chan *chan)
32 {
33 struct ofnode_phandle_args args;
34 int ret;
35 struct udevice *dev_mbox;
36 struct mbox_ops *ops;
37
38 debug("%s(dev=%p, index=%d, chan=%p)\n", __func__, dev, index, chan);
39
40 ret = dev_read_phandle_with_args(dev, "mboxes", "#mbox-cells", 0, index,
41 &args);
42 if (ret) {
43 debug("%s: dev_read_phandle_with_args failed: %d\n", __func__,
44 ret);
45 return ret;
46 }
47
48 ret = uclass_get_device_by_ofnode(UCLASS_MAILBOX, args.node, &dev_mbox);
49 if (ret) {
50 debug("%s: uclass_get_device_by_of_offset failed: %d\n",
51 __func__, ret);
52 return ret;
53 }
54 ops = mbox_dev_ops(dev_mbox);
55
56 chan->dev = dev_mbox;
57 if (ops->of_xlate)
58 ret = ops->of_xlate(chan, &args);
59 else
60 ret = mbox_of_xlate_default(chan, &args);
61 if (ret) {
62 debug("of_xlate() failed: %d\n", ret);
63 return ret;
64 }
65
66 ret = ops->request(chan);
67 if (ret) {
68 debug("ops->request() failed: %d\n", ret);
69 return ret;
70 }
71
72 return 0;
73 }
74
mbox_get_by_name(struct udevice * dev,const char * name,struct mbox_chan * chan)75 int mbox_get_by_name(struct udevice *dev, const char *name,
76 struct mbox_chan *chan)
77 {
78 int index;
79
80 debug("%s(dev=%p, name=%s, chan=%p)\n", __func__, dev, name, chan);
81
82 index = dev_read_stringlist_search(dev, "mbox-names", name);
83 if (index < 0) {
84 debug("fdt_stringlist_search() failed: %d\n", index);
85 return index;
86 }
87
88 return mbox_get_by_index(dev, index, chan);
89 }
90
mbox_free(struct mbox_chan * chan)91 int mbox_free(struct mbox_chan *chan)
92 {
93 struct mbox_ops *ops = mbox_dev_ops(chan->dev);
94
95 debug("%s(chan=%p)\n", __func__, chan);
96
97 return ops->free(chan);
98 }
99
mbox_send(struct mbox_chan * chan,const void * data)100 int mbox_send(struct mbox_chan *chan, const void *data)
101 {
102 struct mbox_ops *ops = mbox_dev_ops(chan->dev);
103
104 debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
105
106 return ops->send(chan, data);
107 }
108
mbox_recv(struct mbox_chan * chan,void * data,ulong timeout_us)109 int mbox_recv(struct mbox_chan *chan, void *data, ulong timeout_us)
110 {
111 struct mbox_ops *ops = mbox_dev_ops(chan->dev);
112 ulong start_time;
113 int ret;
114
115 debug("%s(chan=%p, data=%p, timeout_us=%ld)\n", __func__, chan, data,
116 timeout_us);
117
118 start_time = timer_get_us();
119 /*
120 * Account for partial us ticks, but if timeout_us is 0, ensure we
121 * still don't wait at all.
122 */
123 if (timeout_us)
124 timeout_us++;
125
126 for (;;) {
127 ret = ops->recv(chan, data);
128 if (ret != -ENODATA)
129 return ret;
130 if ((timer_get_us() - start_time) >= timeout_us)
131 return -ETIMEDOUT;
132 }
133 }
134
135 UCLASS_DRIVER(mailbox) = {
136 .id = UCLASS_MAILBOX,
137 .name = "mailbox",
138 };
139