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14#include <common.h>
15#include <dm.h>
16#include <log.h>
17#include <misc.h>
18#include <regmap.h>
19
20#include "gdsys_ioep.h"
21
22
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24
25
26
27struct gdsys_ioep_priv {
28 struct regmap *map;
29 bool state;
30};
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37
38
39enum last_spec {
40 READ_DATA_IS_LAST,
41 READ_DATA_IS_NOT_LAST,
42};
43
44static int gdsys_ioep_set_receive(struct udevice *dev, bool val)
45{
46 struct gdsys_ioep_priv *priv = dev_get_priv(dev);
47 u16 state;
48
49 priv->state = !priv->state;
50
51 if (val)
52 state = CTRL_PROC_RECEIVE_ENABLE;
53 else
54 state = ~CTRL_PROC_RECEIVE_ENABLE;
55
56 gdsys_ioep_set(priv->map, tx_control, state);
57
58 if (val) {
59
60 gdsys_ioep_set(priv->map, device_address, 1);
61 }
62
63 return !priv->state;
64}
65
66static int gdsys_ioep_send(struct udevice *dev, int offset,
67 const void *buf, int size)
68{
69 struct gdsys_ioep_priv *priv = dev_get_priv(dev);
70 int k;
71 u16 *p = (u16 *)buf;
72
73 for (k = 0; k < size; ++k)
74 gdsys_ioep_set(priv->map, transmit_data, *(p++));
75
76 gdsys_ioep_set(priv->map, tx_control, CTRL_PROC_RECEIVE_ENABLE |
77 CTRL_FLUSH_TRANSMIT_BUFFER);
78
79 return 0;
80}
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92
93static int receive_byte_buffer(struct udevice *dev, uint len,
94 u16 *buffer, enum last_spec last_spec)
95{
96 struct gdsys_ioep_priv *priv = dev_get_priv(dev);
97 int k;
98 int ret = -EIO;
99
100 for (k = 0; k < len; ++k) {
101 u16 rx_tx_status;
102
103 gdsys_ioep_get(priv->map, receive_data, buffer++);
104
105 gdsys_ioep_get(priv->map, rx_tx_status, &rx_tx_status);
106
107
108
109
110 if (k == (len - 1) && (last_spec == READ_DATA_IS_NOT_LAST ||
111 rx_tx_status & STATE_RX_DATA_LAST))
112 ret = 0;
113 }
114
115 if (ret)
116 debug("%s: Error while receiving bufer (err = %d)\n",
117 dev->name, ret);
118
119 return ret;
120}
121
122static int gdsys_ioep_receive(struct udevice *dev, int offset, void *buf,
123 int size)
124{
125 int ret;
126 struct io_generic_packet header;
127 u16 *p = (u16 *)buf;
128 const int header_words = sizeof(struct io_generic_packet) / sizeof(u16);
129 uint len;
130
131
132 ret = receive_byte_buffer(dev, header_words, p, READ_DATA_IS_NOT_LAST);
133 if (ret) {
134 debug("%s: Failed to read header data (err = %d)\n",
135 dev->name, ret);
136 return ret;
137 }
138
139 memcpy(&header, p, header_words * sizeof(u16));
140 p += header_words;
141
142
143 len = (header.packet_length + 1) / sizeof(u16);
144
145
146 ret = receive_byte_buffer(dev, len, p, READ_DATA_IS_LAST);
147 if (ret) {
148 debug("%s: Failed to read payload data (err = %d)\n",
149 dev->name, ret);
150 return ret;
151 }
152
153 return 0;
154}
155
156static int gdsys_ioep_get_and_reset_status(struct udevice *dev, int msgid,
157 void *tx_msg, int tx_size,
158 void *rx_msg, int rx_size)
159{
160 struct gdsys_ioep_priv *priv = dev_get_priv(dev);
161 const u16 mask = STATE_RX_DIST_ERR | STATE_RX_LENGTH_ERR |
162 STATE_RX_FRAME_CTR_ERR | STATE_RX_FCS_ERR |
163 STATE_RX_PACKET_DROPPED | STATE_TX_ERR;
164 u16 *status = rx_msg;
165
166 gdsys_ioep_get(priv->map, rx_tx_status, status);
167
168 gdsys_ioep_set(priv->map, rx_tx_status, *status);
169
170 return (*status & mask) ? 1 : 0;
171}
172
173static const struct misc_ops gdsys_ioep_ops = {
174 .set_enabled = gdsys_ioep_set_receive,
175 .write = gdsys_ioep_send,
176 .read = gdsys_ioep_receive,
177 .call = gdsys_ioep_get_and_reset_status,
178};
179
180static int gdsys_ioep_probe(struct udevice *dev)
181{
182 struct gdsys_ioep_priv *priv = dev_get_priv(dev);
183 int ret;
184
185 ret = regmap_init_mem(dev_ofnode(dev), &priv->map);
186 if (ret) {
187 debug("%s: Could not initialize regmap (err = %d)",
188 dev->name, ret);
189 return ret;
190 }
191
192 priv->state = false;
193
194 return 0;
195}
196
197static const struct udevice_id gdsys_ioep_ids[] = {
198 { .compatible = "gdsys,io-endpoint" },
199 { }
200};
201
202U_BOOT_DRIVER(gdsys_ioep) = {
203 .name = "gdsys_ioep",
204 .id = UCLASS_MISC,
205 .ops = &gdsys_ioep_ops,
206 .flags = DM_UC_FLAG_SEQ_ALIAS,
207 .of_match = gdsys_ioep_ids,
208 .probe = gdsys_ioep_probe,
209 .priv_auto = sizeof(struct gdsys_ioep_priv),
210};
211