diff options
Diffstat (limited to 'roms/u-boot/drivers/misc/i2c_eeprom.c')
| -rw-r--r-- | roms/u-boot/drivers/misc/i2c_eeprom.c | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/misc/i2c_eeprom.c b/roms/u-boot/drivers/misc/i2c_eeprom.c new file mode 100644 index 000000000..5926c91a2 --- /dev/null +++ b/roms/u-boot/drivers/misc/i2c_eeprom.c @@ -0,0 +1,376 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2014 Google, Inc + */ + +#include <common.h> +#include <eeprom.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/kernel.h> +#include <dm.h> +#include <dm/device-internal.h> +#include <i2c.h> +#include <i2c_eeprom.h> + +struct i2c_eeprom_drv_data { + u32 size; /* size in bytes */ + u32 pagesize; /* page size in bytes */ + u32 addr_offset_mask; /* bits in addr used for offset overflow */ + u32 offset_len; /* size in bytes of offset */ + u32 start_offset; /* valid start offset inside memory, by default 0 */ +}; + +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); +} + +int i2c_eeprom_size(struct udevice *dev) +{ + const struct i2c_eeprom_ops *ops = device_get_ops(dev); + + if (!ops->size) + return -ENOSYS; + + return ops->size(dev); +} + +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 int i2c_eeprom_std_size(struct udevice *dev) +{ + struct i2c_eeprom *priv = dev_get_priv(dev); + + return priv->size; +} + +static const struct i2c_eeprom_ops i2c_eeprom_std_ops = { + .read = i2c_eeprom_std_read, + .write = i2c_eeprom_std_write, + .size = i2c_eeprom_std_size, +}; + +static int i2c_eeprom_std_of_to_plat(struct udevice *dev) +{ + struct i2c_eeprom *priv = dev_get_priv(dev); + struct i2c_eeprom_drv_data *data = + (struct i2c_eeprom_drv_data *)dev_get_driver_data(dev); + u32 pagesize; + u32 size; + + if (dev_read_u32(dev, "pagesize", &pagesize) == 0) + priv->pagesize = pagesize; + else + /* 6 bit -> page size of up to 2^63 (should be sufficient) */ + priv->pagesize = data->pagesize; + + if (dev_read_u32(dev, "size", &size) == 0) + priv->size = size; + else + priv->size = data->size; + + 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(dev, DM_DRIVER_GET(i2c_eeprom_partition), name, + NULL, partition, NULL); + } + + return 0; +} + +static int i2c_eeprom_std_probe(struct udevice *dev) +{ + u8 test_byte; + int ret; + struct i2c_eeprom_drv_data *data = + (struct i2c_eeprom_drv_data *)dev_get_driver_data(dev); + + i2c_set_chip_offset_len(dev, data->offset_len); + i2c_set_chip_addr_offset_mask(dev, data->addr_offset_mask); + + /* Verify that the chip is functional */ + /* + * Not all eeproms start from offset 0. Valid offset is available + * in the platform data struct. + */ + ret = i2c_eeprom_read(dev, data->start_offset, &test_byte, 1); + if (ret) + return -ENODEV; + + return 0; +} + +static const struct i2c_eeprom_drv_data eeprom_data = { + .size = 0, + .pagesize = 1, + .addr_offset_mask = 0, + .offset_len = 1, +}; + +static const struct i2c_eeprom_drv_data mc24aa02e48_data = { + .size = 256, + .pagesize = 8, + .addr_offset_mask = 0, + .offset_len = 1, +}; + +static const struct i2c_eeprom_drv_data atmel24c01a_data = { + .size = 128, + .pagesize = 8, + .addr_offset_mask = 0, + .offset_len = 1, +}; + +static const struct i2c_eeprom_drv_data atmel24c02_data = { + .size = 256, + .pagesize = 8, + .addr_offset_mask = 0, + .offset_len = 1, +}; + +static const struct i2c_eeprom_drv_data atmel24c04_data = { + .size = 512, + .pagesize = 16, + .addr_offset_mask = 0x1, + .offset_len = 1, +}; + +static const struct i2c_eeprom_drv_data atmel24c08_data = { + .size = 1024, + .pagesize = 16, + .addr_offset_mask = 0x3, + .offset_len = 1, +}; + +static const struct i2c_eeprom_drv_data atmel24c08a_data = { + .size = 1024, + .pagesize = 16, + .addr_offset_mask = 0x3, + .offset_len = 1, +}; + +static const struct i2c_eeprom_drv_data atmel24c16a_data = { + .size = 2048, + .pagesize = 16, + .addr_offset_mask = 0x7, + .offset_len = 1, +}; + +static const struct i2c_eeprom_drv_data atmel24mac402_data = { + .size = 256, + .pagesize = 16, + .addr_offset_mask = 0, + .offset_len = 1, + .start_offset = 0x80, +}; + +static const struct i2c_eeprom_drv_data atmel24c32_data = { + .size = 4096, + .pagesize = 32, + .addr_offset_mask = 0, + .offset_len = 2, +}; + +static const struct i2c_eeprom_drv_data atmel24c64_data = { + .size = 8192, + .pagesize = 32, + .addr_offset_mask = 0, + .offset_len = 2, +}; + +static const struct i2c_eeprom_drv_data atmel24c128_data = { + .size = 16384, + .pagesize = 64, + .addr_offset_mask = 0, + .offset_len = 2, +}; + +static const struct i2c_eeprom_drv_data atmel24c256_data = { + .size = 32768, + .pagesize = 64, + .addr_offset_mask = 0, + .offset_len = 2, +}; + +static const struct i2c_eeprom_drv_data atmel24c512_data = { + .size = 65536, + .pagesize = 64, + .addr_offset_mask = 0, + .offset_len = 2, +}; + +static const struct udevice_id i2c_eeprom_std_ids[] = { + { .compatible = "i2c-eeprom", (ulong)&eeprom_data }, + { .compatible = "microchip,24aa02e48", (ulong)&mc24aa02e48_data }, + { .compatible = "atmel,24c01a", (ulong)&atmel24c01a_data }, + { .compatible = "atmel,24c02", (ulong)&atmel24c02_data }, + { .compatible = "atmel,24c04", (ulong)&atmel24c04_data }, + { .compatible = "atmel,24c08", (ulong)&atmel24c08_data }, + { .compatible = "atmel,24c08a", (ulong)&atmel24c08a_data }, + { .compatible = "atmel,24c16a", (ulong)&atmel24c16a_data }, + { .compatible = "atmel,24mac402", (ulong)&atmel24mac402_data }, + { .compatible = "atmel,24c32", (ulong)&atmel24c32_data }, + { .compatible = "atmel,24c64", (ulong)&atmel24c64_data }, + { .compatible = "atmel,24c128", (ulong)&atmel24c128_data }, + { .compatible = "atmel,24c256", (ulong)&atmel24c256_data }, + { .compatible = "atmel,24c512", (ulong)&atmel24c512_data }, + { } +}; + +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, + .of_to_plat = i2c_eeprom_std_of_to_plat, + .priv_auto = 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_of_to_plat(struct udevice *dev) +{ + struct i2c_eeprom_partition *priv = dev_get_priv(dev); + u32 reg[2]; + int ret; + + ret = dev_read_u32_array(dev, "reg", reg, 2); + if (ret) + return ret; + + if (!reg[1]) + return -EINVAL; + + priv->offset = reg[0]; + priv->size = reg[1]; + + debug("%s: base %x, size %x\n", __func__, priv->offset, priv->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 int i2c_eeprom_partition_size(struct udevice *dev) +{ + struct i2c_eeprom_partition *priv = dev_get_priv(dev); + + return priv->size; +} + +static const struct i2c_eeprom_ops i2c_eeprom_partition_ops = { + .read = i2c_eeprom_partition_read, + .write = i2c_eeprom_partition_write, + .size = i2c_eeprom_partition_size, +}; + +U_BOOT_DRIVER(i2c_eeprom_partition) = { + .name = "i2c_eeprom_partition", + .id = UCLASS_I2C_EEPROM, + .probe = i2c_eeprom_partition_probe, + .of_to_plat = i2c_eeprom_partition_of_to_plat, + .priv_auto = sizeof(struct i2c_eeprom_partition), + .ops = &i2c_eeprom_partition_ops, +}; + +UCLASS_DRIVER(i2c_eeprom) = { + .id = UCLASS_I2C_EEPROM, + .name = "i2c_eeprom", +}; |