1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2014 Google, Inc
4 */
5
6 #include <common.h>
7 #include <eeprom.h>
8 #include <linux/err.h>
9 #include <linux/kernel.h>
10 #include <dm.h>
11 #include <i2c.h>
12 #include <i2c_eeprom.h>
13
i2c_eeprom_read(struct udevice * dev,int offset,uint8_t * buf,int size)14 int i2c_eeprom_read(struct udevice *dev, int offset, uint8_t *buf, int size)
15 {
16 const struct i2c_eeprom_ops *ops = device_get_ops(dev);
17
18 if (!ops->read)
19 return -ENOSYS;
20
21 return ops->read(dev, offset, buf, size);
22 }
23
i2c_eeprom_write(struct udevice * dev,int offset,uint8_t * buf,int size)24 int i2c_eeprom_write(struct udevice *dev, int offset, uint8_t *buf, int size)
25 {
26 const struct i2c_eeprom_ops *ops = device_get_ops(dev);
27
28 if (!ops->write)
29 return -ENOSYS;
30
31 return ops->write(dev, offset, buf, size);
32 }
33
i2c_eeprom_std_read(struct udevice * dev,int offset,uint8_t * buf,int size)34 static int i2c_eeprom_std_read(struct udevice *dev, int offset, uint8_t *buf,
35 int size)
36 {
37 return dm_i2c_read(dev, offset, buf, size);
38 }
39
i2c_eeprom_std_write(struct udevice * dev,int offset,const uint8_t * buf,int size)40 static int i2c_eeprom_std_write(struct udevice *dev, int offset,
41 const uint8_t *buf, int size)
42 {
43 struct i2c_eeprom *priv = dev_get_priv(dev);
44 int ret;
45
46 while (size > 0) {
47 int write_size = min_t(int, size, priv->pagesize);
48
49 ret = dm_i2c_write(dev, offset, buf, write_size);
50 if (ret)
51 return ret;
52
53 offset += write_size;
54 buf += write_size;
55 size -= write_size;
56
57 udelay(10000);
58 }
59
60 return 0;
61 }
62
63 static const struct i2c_eeprom_ops i2c_eeprom_std_ops = {
64 .read = i2c_eeprom_std_read,
65 .write = i2c_eeprom_std_write,
66 };
67
i2c_eeprom_std_ofdata_to_platdata(struct udevice * dev)68 static int i2c_eeprom_std_ofdata_to_platdata(struct udevice *dev)
69 {
70 struct i2c_eeprom *priv = dev_get_priv(dev);
71 u64 data = dev_get_driver_data(dev);
72 u32 pagesize;
73
74 if (dev_read_u32(dev, "pagesize", &pagesize) == 0) {
75 priv->pagesize = pagesize;
76 return 0;
77 }
78
79 /* 6 bit -> page size of up to 2^63 (should be sufficient) */
80 priv->pagewidth = data & 0x3F;
81 priv->pagesize = (1 << priv->pagewidth);
82
83 return 0;
84 }
85
i2c_eeprom_std_probe(struct udevice * dev)86 static int i2c_eeprom_std_probe(struct udevice *dev)
87 {
88 u8 test_byte;
89 int ret;
90
91 /* Verify that the chip is functional */
92 ret = i2c_eeprom_read(dev, 0, &test_byte, 1);
93 if (ret)
94 return -ENODEV;
95
96 return 0;
97 }
98
99 static const struct udevice_id i2c_eeprom_std_ids[] = {
100 { .compatible = "i2c-eeprom", .data = 0 },
101 { .compatible = "microchip,24aa02e48", .data = 3 },
102 { .compatible = "atmel,24c01a", .data = 3 },
103 { .compatible = "atmel,24c02", .data = 3 },
104 { .compatible = "atmel,24c04", .data = 4 },
105 { .compatible = "atmel,24c08", .data = 4 },
106 { .compatible = "atmel,24c08a", .data = 4 },
107 { .compatible = "atmel,24c16a", .data = 4 },
108 { .compatible = "atmel,24mac402", .data = 4 },
109 { .compatible = "atmel,24c32", .data = 5 },
110 { .compatible = "atmel,24c64", .data = 5 },
111 { .compatible = "atmel,24c128", .data = 6 },
112 { .compatible = "atmel,24c256", .data = 6 },
113 { .compatible = "atmel,24c512", .data = 6 },
114 { }
115 };
116
117 U_BOOT_DRIVER(i2c_eeprom_std) = {
118 .name = "i2c_eeprom",
119 .id = UCLASS_I2C_EEPROM,
120 .of_match = i2c_eeprom_std_ids,
121 .probe = i2c_eeprom_std_probe,
122 .ofdata_to_platdata = i2c_eeprom_std_ofdata_to_platdata,
123 .priv_auto_alloc_size = sizeof(struct i2c_eeprom),
124 .ops = &i2c_eeprom_std_ops,
125 };
126
127 UCLASS_DRIVER(i2c_eeprom) = {
128 .id = UCLASS_I2C_EEPROM,
129 .name = "i2c_eeprom",
130 };
131