blob: 4410d0357ff37f63020a8e5820a3ca3d2ced7b13 [file] [log] [blame]
Simon Glass6ec1b752014-12-10 08:55:51 -07001/*
2 * Simulate an I2C eeprom
3 *
4 * Copyright (c) 2014 Google, Inc
5 *
6 * SPDX-License-Identifier: GPL-2.0+
7 */
8
9#include <common.h>
10#include <dm.h>
Simon Glass38068822015-05-04 11:31:08 -060011#include <errno.h>
Simon Glass6ec1b752014-12-10 08:55:51 -070012#include <fdtdec.h>
13#include <i2c.h>
14#include <malloc.h>
15#include <asm/test.h>
16
17#ifdef DEBUG
18#define debug_buffer print_buffer
19#else
20#define debug_buffer(x, ...)
21#endif
22
23DECLARE_GLOBAL_DATA_PTR;
24
25struct sandbox_i2c_flash_plat_data {
26 enum sandbox_i2c_eeprom_test_mode test_mode;
27 const char *filename;
28 int offset_len; /* Length of an offset in bytes */
29 int size; /* Size of data buffer */
30};
31
32struct sandbox_i2c_flash {
33 uint8_t *data;
34};
35
36void sandbox_i2c_eeprom_set_test_mode(struct udevice *dev,
37 enum sandbox_i2c_eeprom_test_mode mode)
38{
39 struct sandbox_i2c_flash_plat_data *plat = dev_get_platdata(dev);
40
41 plat->test_mode = mode;
42}
43
44void sandbox_i2c_eeprom_set_offset_len(struct udevice *dev, int offset_len)
45{
46 struct sandbox_i2c_flash_plat_data *plat = dev_get_platdata(dev);
47
48 plat->offset_len = offset_len;
49}
50
51static int sandbox_i2c_eeprom_xfer(struct udevice *emul, struct i2c_msg *msg,
52 int nmsgs)
53{
54 struct sandbox_i2c_flash *priv = dev_get_priv(emul);
55 uint offset = 0;
56
57 debug("\n%s\n", __func__);
58 debug_buffer(0, priv->data, 1, 16, 0);
59 for (; nmsgs > 0; nmsgs--, msg++) {
60 struct sandbox_i2c_flash_plat_data *plat =
61 dev_get_platdata(emul);
62 int len;
63 u8 *ptr;
64
65 if (!plat->size)
66 return -ENODEV;
67 if (msg->addr + msg->len > plat->size) {
68 debug("%s: Address %x, len %x is outside range 0..%x\n",
69 __func__, msg->addr, msg->len, plat->size);
70 return -EINVAL;
71 }
72 len = msg->len;
73 debug(" %s: msg->len=%d",
74 msg->flags & I2C_M_RD ? "read" : "write",
75 msg->len);
76 if (msg->flags & I2C_M_RD) {
77 if (plat->test_mode == SIE_TEST_MODE_SINGLE_BYTE)
78 len = 1;
79 debug(", offset %x, len %x: ", offset, len);
80 memcpy(msg->buf, priv->data + offset, len);
81 memset(msg->buf + len, '\xff', msg->len - len);
82 debug_buffer(0, msg->buf, 1, msg->len, 0);
83 } else if (len >= plat->offset_len) {
84 int i;
85
86 ptr = msg->buf;
87 for (i = 0; i < plat->offset_len; i++, len--)
88 offset = (offset << 8) | *ptr++;
89 debug(", set offset %x: ", offset);
90 debug_buffer(0, msg->buf, 1, msg->len, 0);
91 if (plat->test_mode == SIE_TEST_MODE_SINGLE_BYTE)
92 len = min(len, 1);
93
94 /* For testing, map offsets into our limited buffer */
95 for (i = 24; i > 0; i -= 8) {
96 if (offset > (1 << i)) {
97 offset = (offset >> i) |
98 (offset & ((1 << i) - 1));
99 offset += i;
100 }
101 }
102 memcpy(priv->data + offset, ptr, len);
103 }
104 }
105 debug_buffer(0, priv->data, 1, 16, 0);
106
107 return 0;
108}
109
110struct dm_i2c_ops sandbox_i2c_emul_ops = {
111 .xfer = sandbox_i2c_eeprom_xfer,
112};
113
114static int sandbox_i2c_eeprom_ofdata_to_platdata(struct udevice *dev)
115{
116 struct sandbox_i2c_flash_plat_data *plat = dev_get_platdata(dev);
117
118 plat->size = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
119 "sandbox,size", 32);
120 plat->filename = fdt_getprop(gd->fdt_blob, dev->of_offset,
121 "sandbox,filename", NULL);
122 if (!plat->filename) {
123 debug("%s: No filename for device '%s'\n", __func__,
124 dev->name);
125 return -EINVAL;
126 }
127 plat->test_mode = SIE_TEST_MODE_NONE;
128 plat->offset_len = 1;
129
130 return 0;
131}
132
133static int sandbox_i2c_eeprom_probe(struct udevice *dev)
134{
135 struct sandbox_i2c_flash_plat_data *plat = dev_get_platdata(dev);
136 struct sandbox_i2c_flash *priv = dev_get_priv(dev);
137
138 priv->data = calloc(1, plat->size);
139 if (!priv->data)
140 return -ENOMEM;
141
142 return 0;
143}
144
145static int sandbox_i2c_eeprom_remove(struct udevice *dev)
146{
147 struct sandbox_i2c_flash *priv = dev_get_priv(dev);
148
149 free(priv->data);
150
151 return 0;
152}
153
154static const struct udevice_id sandbox_i2c_ids[] = {
155 { .compatible = "sandbox,i2c-eeprom" },
156 { }
157};
158
159U_BOOT_DRIVER(sandbox_i2c_emul) = {
160 .name = "sandbox_i2c_eeprom_emul",
161 .id = UCLASS_I2C_EMUL,
162 .of_match = sandbox_i2c_ids,
163 .ofdata_to_platdata = sandbox_i2c_eeprom_ofdata_to_platdata,
164 .probe = sandbox_i2c_eeprom_probe,
165 .remove = sandbox_i2c_eeprom_remove,
166 .priv_auto_alloc_size = sizeof(struct sandbox_i2c_flash),
167 .platdata_auto_alloc_size = sizeof(struct sandbox_i2c_flash_plat_data),
168 .ops = &sandbox_i2c_emul_ops,
169};