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dcee0ed33b
The ST M24256E behaves as a regular M24C256, except for the E variant which uses up another I2C address for Additional Write lockable page. This page is 64 Bytes long and can contain additional data. Add entry for it, so users can describe that page in DT. Note that users still have to describe the main M24C256 area separately as that is on separate I2C address from this page. Unlike M24C32-D and M24C64-D, this part is specifically ST and does not have any comparable M24* counterparts from other vendors, hence the st, vendor prefix. Furthermore, the part name is M24256E without C between the 24 and 256, this is not a typo. Finally, there is M24C256-D part, which does contain 32 Bytes long Additional Write lockable page, which is a different part and not supported by this patch. Datasheet: https://www.st.com/resource/en/datasheet/m24256e-f.pdf From Linux kernel commit: 339cb28b9ee6 ("eeprom: at24: add ST M24256E Additional Write lockable page support") Signed-off-by: Marek Vasut <marex@denx.de>
397 lines
9 KiB
C
397 lines
9 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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#define LOG_CATEGORY UCLASS_I2C_EEPROM
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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, const uint8_t *buf,
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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_len(int offset, int len, int pagesize)
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{
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int page_offset = offset & (pagesize - 1);
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int maxlen = pagesize - page_offset;
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if (len > maxlen)
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len = maxlen;
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return len;
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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 = i2c_eeprom_len(offset, 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_of_to_plat(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(dev, DM_DRIVER_GET(i2c_eeprom_partition), name,
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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 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 atmel24c32d_wlp_data = {
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.size = 32,
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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 st24256e_wlp_data = {
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.size = 64,
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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 = "atmel,24c01", (ulong)&atmel24c01a_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,24c32d-wl", (ulong)&atmel24c32d_wlp_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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{ .compatible = "st,24256e-wl", (ulong)&st24256e_wlp_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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.of_to_plat = i2c_eeprom_std_of_to_plat,
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.priv_auto = 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_of_to_plat(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 reg[2];
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int ret;
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ret = dev_read_u32_array(dev, "reg", reg, 2);
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if (ret)
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return ret;
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if (!reg[1])
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return -EINVAL;
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priv->offset = reg[0];
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priv->size = reg[1];
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debug("%s: base %x, size %x\n", __func__, priv->offset, priv->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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.of_to_plat = i2c_eeprom_partition_of_to_plat,
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.priv_auto = 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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