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![Eugen Hristev](/assets/img/avatar_default.png)
Because of this commit :
5ae84860b0
("misc: i2c_eeprom: verify that the chip is functional at probe()")
at probe time, each eeprom is tested for read at offset 0.
The Atmel AT24MAC402 eeprom has different mapping. One i2c slave address is
used for the lower 0x80 bytes and another i2c slave address is used for the
upper 0x80 bytes. Because of this basically the i2c master sees 2 different
slaves. We need the upper bytes because we read the unique MAC address from
this EEPROM area.
However this implies that our slave address will return error on reads
from address 0x0 to 0x80.
To solve this, implemented an offset field inside platform data that is by
default 0 (as it is used now), but can be changed in the compatible table.
The probe function will now read at this offset and use it, instead of blindly
checking offset 0.
This will fix the regression noticed on these EEPROMs since the commit
abovementioned that introduces the probe failed issue.
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
376 lines
8.6 KiB
C
376 lines
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2014 Google, Inc
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*/
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#include <common.h>
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#include <eeprom.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <dm.h>
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#include <dm/device-internal.h>
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#include <i2c.h>
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#include <i2c_eeprom.h>
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struct i2c_eeprom_drv_data {
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u32 size; /* size in bytes */
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u32 pagesize; /* page size in bytes */
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u32 addr_offset_mask; /* bits in addr used for offset overflow */
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u32 offset_len; /* size in bytes of offset */
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u32 start_offset; /* valid start offset inside memory, by default 0 */
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};
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int i2c_eeprom_read(struct udevice *dev, int offset, uint8_t *buf, int size)
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{
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const struct i2c_eeprom_ops *ops = device_get_ops(dev);
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if (!ops->read)
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return -ENOSYS;
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return ops->read(dev, offset, buf, size);
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}
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int i2c_eeprom_write(struct udevice *dev, int offset, uint8_t *buf, int size)
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{
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const struct i2c_eeprom_ops *ops = device_get_ops(dev);
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if (!ops->write)
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return -ENOSYS;
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return ops->write(dev, offset, buf, size);
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}
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int i2c_eeprom_size(struct udevice *dev)
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{
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const struct i2c_eeprom_ops *ops = device_get_ops(dev);
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if (!ops->size)
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return -ENOSYS;
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return ops->size(dev);
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}
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static int i2c_eeprom_std_read(struct udevice *dev, int offset, uint8_t *buf,
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int size)
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{
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return dm_i2c_read(dev, offset, buf, size);
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}
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static int i2c_eeprom_std_write(struct udevice *dev, int offset,
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const uint8_t *buf, int size)
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{
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struct i2c_eeprom *priv = dev_get_priv(dev);
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int ret;
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while (size > 0) {
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int write_size = min_t(int, size, priv->pagesize);
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ret = dm_i2c_write(dev, offset, buf, write_size);
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if (ret)
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return ret;
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offset += write_size;
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buf += write_size;
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size -= write_size;
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udelay(10000);
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}
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return 0;
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}
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static int i2c_eeprom_std_size(struct udevice *dev)
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{
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struct i2c_eeprom *priv = dev_get_priv(dev);
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return priv->size;
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}
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static const struct i2c_eeprom_ops i2c_eeprom_std_ops = {
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.read = i2c_eeprom_std_read,
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.write = i2c_eeprom_std_write,
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.size = i2c_eeprom_std_size,
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};
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static int i2c_eeprom_std_ofdata_to_platdata(struct udevice *dev)
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{
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struct i2c_eeprom *priv = dev_get_priv(dev);
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struct i2c_eeprom_drv_data *data =
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(struct i2c_eeprom_drv_data *)dev_get_driver_data(dev);
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u32 pagesize;
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u32 size;
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if (dev_read_u32(dev, "pagesize", &pagesize) == 0)
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priv->pagesize = pagesize;
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else
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/* 6 bit -> page size of up to 2^63 (should be sufficient) */
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priv->pagesize = data->pagesize;
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if (dev_read_u32(dev, "size", &size) == 0)
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priv->size = size;
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else
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priv->size = data->size;
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return 0;
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}
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static int i2c_eeprom_std_bind(struct udevice *dev)
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{
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ofnode partitions = ofnode_find_subnode(dev_ofnode(dev), "partitions");
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ofnode partition;
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const char *name;
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if (!ofnode_valid(partitions))
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return 0;
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if (!ofnode_device_is_compatible(partitions, "fixed-partitions"))
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return -ENOTSUPP;
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ofnode_for_each_subnode(partition, partitions) {
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name = ofnode_get_name(partition);
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if (!name)
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continue;
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device_bind_ofnode(dev, DM_GET_DRIVER(i2c_eeprom_partition),
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name, NULL, partition, NULL);
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}
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return 0;
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}
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static int i2c_eeprom_std_probe(struct udevice *dev)
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{
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u8 test_byte;
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int ret;
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struct i2c_eeprom_drv_data *data =
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(struct i2c_eeprom_drv_data *)dev_get_driver_data(dev);
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i2c_set_chip_offset_len(dev, data->offset_len);
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i2c_set_chip_addr_offset_mask(dev, data->addr_offset_mask);
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/* Verify that the chip is functional */
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/*
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* Not all eeproms start from offset 0. Valid offset is available
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* in the platform data struct.
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*/
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ret = i2c_eeprom_read(dev, data->start_offset, &test_byte, 1);
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if (ret)
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return -ENODEV;
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return 0;
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}
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static const struct i2c_eeprom_drv_data eeprom_data = {
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.size = 0,
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.pagesize = 1,
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.addr_offset_mask = 0,
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.offset_len = 1,
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};
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static const struct i2c_eeprom_drv_data mc24aa02e48_data = {
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.size = 256,
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.pagesize = 8,
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.addr_offset_mask = 0,
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.offset_len = 1,
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};
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static const struct i2c_eeprom_drv_data atmel24c01a_data = {
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.size = 128,
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.pagesize = 8,
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.addr_offset_mask = 0,
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.offset_len = 1,
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};
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static const struct i2c_eeprom_drv_data atmel24c02_data = {
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.size = 256,
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.pagesize = 8,
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.addr_offset_mask = 0,
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.offset_len = 1,
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};
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static const struct i2c_eeprom_drv_data atmel24c04_data = {
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.size = 512,
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.pagesize = 16,
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.addr_offset_mask = 0x1,
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.offset_len = 1,
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};
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static const struct i2c_eeprom_drv_data atmel24c08_data = {
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.size = 1024,
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.pagesize = 16,
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.addr_offset_mask = 0x3,
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.offset_len = 1,
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};
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static const struct i2c_eeprom_drv_data atmel24c08a_data = {
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.size = 1024,
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.pagesize = 16,
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.addr_offset_mask = 0x3,
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.offset_len = 1,
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};
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static const struct i2c_eeprom_drv_data atmel24c16a_data = {
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.size = 2048,
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.pagesize = 16,
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.addr_offset_mask = 0x7,
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.offset_len = 1,
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};
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static const struct i2c_eeprom_drv_data atmel24mac402_data = {
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.size = 256,
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.pagesize = 16,
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.addr_offset_mask = 0,
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.offset_len = 1,
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.start_offset = 0x80,
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};
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static const struct i2c_eeprom_drv_data atmel24c32_data = {
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.size = 4096,
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.pagesize = 32,
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.addr_offset_mask = 0,
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.offset_len = 2,
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};
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static const struct i2c_eeprom_drv_data atmel24c64_data = {
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.size = 8192,
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.pagesize = 32,
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.addr_offset_mask = 0,
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.offset_len = 2,
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};
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static const struct i2c_eeprom_drv_data atmel24c128_data = {
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.size = 16384,
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.pagesize = 64,
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.addr_offset_mask = 0,
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.offset_len = 2,
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};
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static const struct i2c_eeprom_drv_data atmel24c256_data = {
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.size = 32768,
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.pagesize = 64,
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.addr_offset_mask = 0,
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.offset_len = 2,
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};
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static const struct i2c_eeprom_drv_data atmel24c512_data = {
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.size = 65536,
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.pagesize = 64,
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.addr_offset_mask = 0,
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.offset_len = 2,
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};
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static const struct udevice_id i2c_eeprom_std_ids[] = {
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{ .compatible = "i2c-eeprom", (ulong)&eeprom_data },
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{ .compatible = "microchip,24aa02e48", (ulong)&mc24aa02e48_data },
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{ .compatible = "atmel,24c01a", (ulong)&atmel24c01a_data },
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{ .compatible = "atmel,24c02", (ulong)&atmel24c02_data },
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{ .compatible = "atmel,24c04", (ulong)&atmel24c04_data },
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{ .compatible = "atmel,24c08", (ulong)&atmel24c08_data },
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{ .compatible = "atmel,24c08a", (ulong)&atmel24c08a_data },
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{ .compatible = "atmel,24c16a", (ulong)&atmel24c16a_data },
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{ .compatible = "atmel,24mac402", (ulong)&atmel24mac402_data },
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{ .compatible = "atmel,24c32", (ulong)&atmel24c32_data },
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{ .compatible = "atmel,24c64", (ulong)&atmel24c64_data },
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{ .compatible = "atmel,24c128", (ulong)&atmel24c128_data },
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{ .compatible = "atmel,24c256", (ulong)&atmel24c256_data },
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{ .compatible = "atmel,24c512", (ulong)&atmel24c512_data },
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{ }
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};
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U_BOOT_DRIVER(i2c_eeprom_std) = {
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.name = "i2c_eeprom",
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.id = UCLASS_I2C_EEPROM,
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.of_match = i2c_eeprom_std_ids,
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.bind = i2c_eeprom_std_bind,
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.probe = i2c_eeprom_std_probe,
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.ofdata_to_platdata = i2c_eeprom_std_ofdata_to_platdata,
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.priv_auto_alloc_size = sizeof(struct i2c_eeprom),
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.ops = &i2c_eeprom_std_ops,
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};
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struct i2c_eeprom_partition {
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u32 offset;
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u32 size;
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};
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static int i2c_eeprom_partition_probe(struct udevice *dev)
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{
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return 0;
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}
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static int i2c_eeprom_partition_ofdata_to_platdata(struct udevice *dev)
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{
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struct i2c_eeprom_partition *priv = dev_get_priv(dev);
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u32 offset, size;
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int ret;
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ret = dev_read_u32(dev, "offset", &offset);
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if (ret)
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return ret;
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ret = dev_read_u32(dev, "size", &size);
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if (ret)
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return ret;
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priv->offset = offset;
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priv->size = size;
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return 0;
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}
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static int i2c_eeprom_partition_read(struct udevice *dev, int offset,
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u8 *buf, int size)
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{
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struct i2c_eeprom_partition *priv = dev_get_priv(dev);
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struct udevice *parent = dev_get_parent(dev);
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if (!parent)
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return -ENODEV;
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if (offset + size > priv->size)
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return -EINVAL;
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return i2c_eeprom_read(parent, offset + priv->offset, buf, size);
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}
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static int i2c_eeprom_partition_write(struct udevice *dev, int offset,
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const u8 *buf, int size)
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{
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struct i2c_eeprom_partition *priv = dev_get_priv(dev);
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struct udevice *parent = dev_get_parent(dev);
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if (!parent)
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return -ENODEV;
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if (offset + size > priv->size)
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return -EINVAL;
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return i2c_eeprom_write(parent, offset + priv->offset, (uint8_t *)buf,
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size);
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}
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static int i2c_eeprom_partition_size(struct udevice *dev)
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{
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struct i2c_eeprom_partition *priv = dev_get_priv(dev);
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return priv->size;
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}
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static const struct i2c_eeprom_ops i2c_eeprom_partition_ops = {
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.read = i2c_eeprom_partition_read,
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.write = i2c_eeprom_partition_write,
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.size = i2c_eeprom_partition_size,
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};
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U_BOOT_DRIVER(i2c_eeprom_partition) = {
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.name = "i2c_eeprom_partition",
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.id = UCLASS_I2C_EEPROM,
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.probe = i2c_eeprom_partition_probe,
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.ofdata_to_platdata = i2c_eeprom_partition_ofdata_to_platdata,
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.priv_auto_alloc_size = sizeof(struct i2c_eeprom_partition),
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.ops = &i2c_eeprom_partition_ops,
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};
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UCLASS_DRIVER(i2c_eeprom) = {
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.id = UCLASS_I2C_EEPROM,
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.name = "i2c_eeprom",
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};
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