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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2014 Google, Inc
*/
#include <common.h>
#include <eeprom.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <dm.h>
#include <dm/device-internal.h>
#include <i2c.h>
#include <i2c_eeprom.h>
int i2c_eeprom_read(struct udevice *dev, int offset, uint8_t *buf, int size)
{
const struct i2c_eeprom_ops *ops = device_get_ops(dev);
if (!ops->read)
return -ENOSYS;
return ops->read(dev, offset, buf, size);
}
int i2c_eeprom_write(struct udevice *dev, int offset, uint8_t *buf, int size)
{
const struct i2c_eeprom_ops *ops = device_get_ops(dev);
if (!ops->write)
return -ENOSYS;
return ops->write(dev, offset, buf, size);
}
static int i2c_eeprom_std_read(struct udevice *dev, int offset, uint8_t *buf,
int size)
{
return dm_i2c_read(dev, offset, buf, size);
}
static int i2c_eeprom_std_write(struct udevice *dev, int offset,
const uint8_t *buf, int size)
{
struct i2c_eeprom *priv = dev_get_priv(dev);
int ret;
while (size > 0) {
int write_size = min_t(int, size, priv->pagesize);
ret = dm_i2c_write(dev, offset, buf, write_size);
if (ret)
return ret;
offset += write_size;
buf += write_size;
size -= write_size;
udelay(10000);
}
return 0;
}
static const struct i2c_eeprom_ops i2c_eeprom_std_ops = {
.read = i2c_eeprom_std_read,
.write = i2c_eeprom_std_write,
};
static int i2c_eeprom_std_ofdata_to_platdata(struct udevice *dev)
{
struct i2c_eeprom *priv = dev_get_priv(dev);
u64 data = dev_get_driver_data(dev);
u32 pagesize;
if (dev_read_u32(dev, "pagesize", &pagesize) == 0) {
priv->pagesize = pagesize;
return 0;
}
/* 6 bit -> page size of up to 2^63 (should be sufficient) */
priv->pagewidth = data & 0x3F;
priv->pagesize = (1 << priv->pagewidth);
return 0;
}
static int i2c_eeprom_std_bind(struct udevice *dev)
{
ofnode partitions = ofnode_find_subnode(dev_ofnode(dev), "partitions");
ofnode partition;
const char *name;
if (!ofnode_valid(partitions))
return 0;
if (!ofnode_device_is_compatible(partitions, "fixed-partitions"))
return -ENOTSUPP;
ofnode_for_each_subnode(partition, partitions) {
name = ofnode_get_name(partition);
if (!name)
continue;
device_bind_ofnode(dev, DM_GET_DRIVER(i2c_eeprom_partition),
name, NULL, partition, NULL);
}
return 0;
}
static int i2c_eeprom_std_probe(struct udevice *dev)
{
u8 test_byte;
int ret;
/* Verify that the chip is functional */
ret = i2c_eeprom_read(dev, 0, &test_byte, 1);
if (ret)
return -ENODEV;
return 0;
}
static const struct udevice_id i2c_eeprom_std_ids[] = {
{ .compatible = "i2c-eeprom", .data = 0 },
{ .compatible = "microchip,24aa02e48", .data = 3 },
{ .compatible = "atmel,24c01a", .data = 3 },
{ .compatible = "atmel,24c02", .data = 3 },
{ .compatible = "atmel,24c04", .data = 4 },
{ .compatible = "atmel,24c08", .data = 4 },
{ .compatible = "atmel,24c08a", .data = 4 },
{ .compatible = "atmel,24c16a", .data = 4 },
{ .compatible = "atmel,24mac402", .data = 4 },
{ .compatible = "atmel,24c32", .data = 5 },
{ .compatible = "atmel,24c64", .data = 5 },
{ .compatible = "atmel,24c128", .data = 6 },
{ .compatible = "atmel,24c256", .data = 6 },
{ .compatible = "atmel,24c512", .data = 6 },
{ }
};
U_BOOT_DRIVER(i2c_eeprom_std) = {
.name = "i2c_eeprom",
.id = UCLASS_I2C_EEPROM,
.of_match = i2c_eeprom_std_ids,
.bind = i2c_eeprom_std_bind,
.probe = i2c_eeprom_std_probe,
.ofdata_to_platdata = i2c_eeprom_std_ofdata_to_platdata,
.priv_auto_alloc_size = sizeof(struct i2c_eeprom),
.ops = &i2c_eeprom_std_ops,
};
struct i2c_eeprom_partition {
u32 offset;
u32 size;
};
static int i2c_eeprom_partition_probe(struct udevice *dev)
{
return 0;
}
static int i2c_eeprom_partition_ofdata_to_platdata(struct udevice *dev)
{
struct i2c_eeprom_partition *priv = dev_get_priv(dev);
u32 offset, size;
int ret;
ret = dev_read_u32(dev, "offset", &offset);
if (ret)
return ret;
ret = dev_read_u32(dev, "size", &size);
if (ret)
return ret;
priv->offset = offset;
priv->size = size;
return 0;
}
static int i2c_eeprom_partition_read(struct udevice *dev, int offset,
u8 *buf, int size)
{
struct i2c_eeprom_partition *priv = dev_get_priv(dev);
struct udevice *parent = dev_get_parent(dev);
if (!parent)
return -ENODEV;
if (offset + size > priv->size)
return -EINVAL;
return i2c_eeprom_read(parent, offset + priv->offset, buf, size);
}
static int i2c_eeprom_partition_write(struct udevice *dev, int offset,
const u8 *buf, int size)
{
struct i2c_eeprom_partition *priv = dev_get_priv(dev);
struct udevice *parent = dev_get_parent(dev);
if (!parent)
return -ENODEV;
if (offset + size > priv->size)
return -EINVAL;
return i2c_eeprom_write(parent, offset + priv->offset, (uint8_t *)buf,
size);
}
static const struct i2c_eeprom_ops i2c_eeprom_partition_ops = {
.read = i2c_eeprom_partition_read,
.write = i2c_eeprom_partition_write,
};
U_BOOT_DRIVER(i2c_eeprom_partition) = {
.name = "i2c_eeprom_partition",
.id = UCLASS_I2C_EEPROM,
.probe = i2c_eeprom_partition_probe,
.ofdata_to_platdata = i2c_eeprom_partition_ofdata_to_platdata,
.priv_auto_alloc_size = sizeof(struct i2c_eeprom_partition),
.ops = &i2c_eeprom_partition_ops,
};
UCLASS_DRIVER(i2c_eeprom) = {
.id = UCLASS_I2C_EEPROM,
.name = "i2c_eeprom",
};
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