1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2016, NVIDIA CORPORATION.
4 */
5
6 #define LOG_CATEGORY UCLASS_MAILBOX
7
8 #include <dm.h>
9 #include <log.h>
10 #include <mailbox.h>
11 #include <mailbox-uclass.h>
12 #include <malloc.h>
13 #include <time.h>
14
mbox_dev_ops(struct udevice * dev)15 static inline struct mbox_ops *mbox_dev_ops(struct udevice *dev)
16 {
17 return (struct mbox_ops *)dev->driver->ops;
18 }
19
mbox_of_xlate_default(struct mbox_chan * chan,struct ofnode_phandle_args * args)20 static int mbox_of_xlate_default(struct mbox_chan *chan,
21 struct ofnode_phandle_args *args)
22 {
23 debug("%s(chan=%p)\n", __func__, chan);
24
25 if (args->args_count != 1) {
26 debug("Invalid args_count: %d\n", args->args_count);
27 return -EINVAL;
28 }
29
30 chan->id = args->args[0];
31
32 return 0;
33 }
34
mbox_get_by_index(struct udevice * dev,int index,struct mbox_chan * chan)35 int mbox_get_by_index(struct udevice *dev, int index, struct mbox_chan *chan)
36 {
37 struct ofnode_phandle_args args;
38 int ret;
39 struct udevice *dev_mbox;
40 struct mbox_ops *ops;
41
42 debug("%s(dev=%p, index=%d, chan=%p)\n", __func__, dev, index, chan);
43
44 ret = dev_read_phandle_with_args(dev, "mboxes", "#mbox-cells", 0, index,
45 &args);
46 if (ret) {
47 debug("%s: dev_read_phandle_with_args failed: %d\n", __func__,
48 ret);
49 return ret;
50 }
51
52 ret = uclass_get_device_by_ofnode(UCLASS_MAILBOX, args.node, &dev_mbox);
53 if (ret) {
54 debug("%s: uclass_get_device_by_of_offset failed: %d\n",
55 __func__, ret);
56
57 /* Test with parent node */
58 ret = uclass_get_device_by_ofnode(UCLASS_MAILBOX,
59 ofnode_get_parent(args.node),
60 &dev_mbox);
61 if (ret) {
62 debug("%s: mbox node from parent failed: %d\n",
63 __func__, ret);
64 return ret;
65 };
66 }
67 ops = mbox_dev_ops(dev_mbox);
68
69 chan->dev = dev_mbox;
70 if (ops->of_xlate)
71 ret = ops->of_xlate(chan, &args);
72 else
73 ret = mbox_of_xlate_default(chan, &args);
74 if (ret) {
75 debug("of_xlate() failed: %d\n", ret);
76 return ret;
77 }
78
79 if (ops->request)
80 ret = ops->request(chan);
81 if (ret) {
82 debug("ops->request() failed: %d\n", ret);
83 return ret;
84 }
85
86 return 0;
87 }
88
mbox_get_by_name(struct udevice * dev,const char * name,struct mbox_chan * chan)89 int mbox_get_by_name(struct udevice *dev, const char *name,
90 struct mbox_chan *chan)
91 {
92 int index;
93
94 debug("%s(dev=%p, name=%s, chan=%p)\n", __func__, dev, name, chan);
95
96 index = dev_read_stringlist_search(dev, "mbox-names", name);
97 if (index < 0) {
98 debug("fdt_stringlist_search() failed: %d\n", index);
99 return index;
100 }
101
102 return mbox_get_by_index(dev, index, chan);
103 }
104
mbox_free(struct mbox_chan * chan)105 int mbox_free(struct mbox_chan *chan)
106 {
107 struct mbox_ops *ops = mbox_dev_ops(chan->dev);
108
109 debug("%s(chan=%p)\n", __func__, chan);
110
111 if (ops->rfree)
112 return ops->rfree(chan);
113
114 return 0;
115 }
116
mbox_send(struct mbox_chan * chan,const void * data)117 int mbox_send(struct mbox_chan *chan, const void *data)
118 {
119 struct mbox_ops *ops = mbox_dev_ops(chan->dev);
120
121 debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
122
123 return ops->send(chan, data);
124 }
125
mbox_recv(struct mbox_chan * chan,void * data,ulong timeout_us)126 int mbox_recv(struct mbox_chan *chan, void *data, ulong timeout_us)
127 {
128 struct mbox_ops *ops = mbox_dev_ops(chan->dev);
129 ulong start_time;
130 int ret;
131
132 debug("%s(chan=%p, data=%p, timeout_us=%ld)\n", __func__, chan, data,
133 timeout_us);
134
135 start_time = timer_get_us();
136 /*
137 * Account for partial us ticks, but if timeout_us is 0, ensure we
138 * still don't wait at all.
139 */
140 if (timeout_us)
141 timeout_us++;
142
143 for (;;) {
144 ret = ops->recv(chan, data);
145 if (ret != -ENODATA)
146 return ret;
147 if ((timer_get_us() - start_time) >= timeout_us)
148 return -ETIMEDOUT;
149 }
150 }
151
152 UCLASS_DRIVER(mailbox) = {
153 .id = UCLASS_MAILBOX,
154 .name = "mailbox",
155 };
156