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