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1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2014 Google, Inc
4  */
5 
6 #include <common.h>
7 #include <linux/err.h>
8 #include <dm.h>
9 #include <i2c.h>
10 #include <i2c_eeprom.h>
11 
i2c_eeprom_read(struct udevice * dev,int offset,uint8_t * buf,int size)12 int i2c_eeprom_read(struct udevice *dev, int offset, uint8_t *buf, int size)
13 {
14 	const struct i2c_eeprom_ops *ops = device_get_ops(dev);
15 
16 	if (!ops->read)
17 		return -ENOSYS;
18 
19 	return ops->read(dev, offset, buf, size);
20 }
21 
i2c_eeprom_write(struct udevice * dev,int offset,uint8_t * buf,int size)22 int i2c_eeprom_write(struct udevice *dev, int offset, uint8_t *buf, int size)
23 {
24 	const struct i2c_eeprom_ops *ops = device_get_ops(dev);
25 
26 	if (!ops->write)
27 		return -ENOSYS;
28 
29 	return ops->write(dev, offset, buf, size);
30 }
31 
i2c_eeprom_std_read(struct udevice * dev,int offset,uint8_t * buf,int size)32 static int i2c_eeprom_std_read(struct udevice *dev, int offset, uint8_t *buf,
33 			       int size)
34 {
35 	return dm_i2c_read(dev, offset, buf, size);
36 }
37 
i2c_eeprom_std_write(struct udevice * dev,int offset,const uint8_t * buf,int size)38 static int i2c_eeprom_std_write(struct udevice *dev, int offset,
39 				const uint8_t *buf, int size)
40 {
41 	return -ENODEV;
42 }
43 
44 static const struct i2c_eeprom_ops i2c_eeprom_std_ops = {
45 	.read	= i2c_eeprom_std_read,
46 	.write	= i2c_eeprom_std_write,
47 };
48 
i2c_eeprom_std_ofdata_to_platdata(struct udevice * dev)49 static int i2c_eeprom_std_ofdata_to_platdata(struct udevice *dev)
50 {
51 	struct i2c_eeprom *priv = dev_get_priv(dev);
52 	u64 data = dev_get_driver_data(dev);
53 
54 	/* 6 bit -> page size of up to 2^63 (should be sufficient) */
55 	priv->pagewidth = data & 0x3F;
56 	priv->pagesize = (1 << priv->pagewidth);
57 
58 	return 0;
59 }
60 
i2c_eeprom_std_probe(struct udevice * dev)61 static int i2c_eeprom_std_probe(struct udevice *dev)
62 {
63 	return 0;
64 }
65 
66 static const struct udevice_id i2c_eeprom_std_ids[] = {
67 	{ .compatible = "i2c-eeprom", .data = 0 },
68 	{ .compatible = "microchip,24aa02e48", .data = 3 },
69 	{ .compatible = "atmel,24c01a", .data = 3 },
70 	{ .compatible = "atmel,24c02", .data = 3 },
71 	{ .compatible = "atmel,24c04", .data = 4 },
72 	{ .compatible = "atmel,24c08a", .data = 4 },
73 	{ .compatible = "atmel,24c16a", .data = 4 },
74 	{ .compatible = "atmel,24mac402", .data = 4 },
75 	{ .compatible = "atmel,24c32", .data = 5 },
76 	{ .compatible = "atmel,24c64", .data = 5 },
77 	{ .compatible = "atmel,24c128", .data = 6 },
78 	{ .compatible = "atmel,24c256", .data = 6 },
79 	{ .compatible = "atmel,24c512", .data = 6 },
80 	{ }
81 };
82 
83 U_BOOT_DRIVER(i2c_eeprom_std) = {
84 	.name			= "i2c_eeprom",
85 	.id			= UCLASS_I2C_EEPROM,
86 	.of_match		= i2c_eeprom_std_ids,
87 	.probe			= i2c_eeprom_std_probe,
88 	.ofdata_to_platdata	= i2c_eeprom_std_ofdata_to_platdata,
89 	.priv_auto_alloc_size	= sizeof(struct i2c_eeprom),
90 	.ops			= &i2c_eeprom_std_ops,
91 };
92 
93 UCLASS_DRIVER(i2c_eeprom) = {
94 	.id		= UCLASS_I2C_EEPROM,
95 	.name		= "i2c_eeprom",
96 };
97