From: Igor Opaniuk igor.opaniuk@toradex.com
These functions wrap functionality for storing config blocks in EEPROM.
Signed-off-by: Igor Opaniuk igor.opaniuk@toradex.com ---
board/toradex/common/Makefile | 1 + board/toradex/common/tdx-eeprom.c | 90 +++++++++++++++++++++++++++++++++++++++ board/toradex/common/tdx-eeprom.h | 14 ++++++ 3 files changed, 105 insertions(+) create mode 100644 board/toradex/common/tdx-eeprom.c create mode 100644 board/toradex/common/tdx-eeprom.h
diff --git a/board/toradex/common/Makefile b/board/toradex/common/Makefile index 6b9fccb..7b19b6e 100644 --- a/board/toradex/common/Makefile +++ b/board/toradex/common/Makefile @@ -8,4 +8,5 @@ obj- := __dummy__.o else obj-$(CONFIG_TDX_CFG_BLOCK) += tdx-cfg-block.o obj-y += tdx-common.o +obj-y += tdx-eeprom.o endif diff --git a/board/toradex/common/tdx-eeprom.c b/board/toradex/common/tdx-eeprom.c new file mode 100644 index 0000000..fbc267d --- /dev/null +++ b/board/toradex/common/tdx-eeprom.c @@ -0,0 +1,90 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2020 Toradex + */ + +#include <dm.h> +#include <i2c_eeprom.h> +#include <linux/errno.h> + +DECLARE_GLOBAL_DATA_PTR; + +static int get_tdx_eeprom(u32 eeprom_id, struct udevice **devp) +{ + int ret = 0; + int node; + ofnode eeprom; + char eeprom_str[16]; + const char *path; + + if (!gd->fdt_blob) { + printf("%s: don't have a valid gd->fdt_blob!\n", __func__); + return -EFAULT; + } + + node = fdt_path_offset(gd->fdt_blob, "/aliases"); + if (node < 0) + return -ENODEV; + + sprintf(eeprom_str, "eeprom%d", eeprom_id); + + path = fdt_getprop(gd->fdt_blob, node, eeprom_str, NULL); + if (!path) { + printf("%s: no alias for %s\n", __func__, eeprom_str); + return -ENODEV; + } + + eeprom = ofnode_path(path); + if (!ofnode_valid(eeprom)) { + printf("%s: invalid hardware path to EEPROM\n", __func__); + return -ENODEV; + } + + ret = uclass_get_device_by_ofnode(UCLASS_I2C_EEPROM, eeprom, devp); + if (ret) { + printf("%s: cannot find EEPROM by node\n", __func__); + return ret; + } + + return ret; +} + +int read_tdx_eeprom_data(u32 eeprom_id, int offset, u8 *buf, + int size) +{ + struct udevice *dev; + int ret; + + ret = get_tdx_eeprom(eeprom_id, &dev); + if (ret) + return ret; + + ret = i2c_eeprom_read(dev, 0x0, buf, size); + if (ret) { + printf("%s: error reading data from EEPROM id: %d!, ret = %d\n", + __func__, eeprom_id, ret); + return ret; + } + + return ret; +} + +int write_tdx_eeprom_data(u32 eeprom_id, int offset, u8 *buf, + int size) +{ + struct udevice *dev; + int ret; + + ret = get_tdx_eeprom(eeprom_id, &dev); + if (ret) + return ret; + + ret = i2c_eeprom_write(dev, 0x0, buf, size); + if (ret) { + printf("%s: error writing data to EEPROM id: %d, ret = %d\n", + __func__, eeprom_id, ret); + return ret; + } + + return ret; +} diff --git a/board/toradex/common/tdx-eeprom.h b/board/toradex/common/tdx-eeprom.h new file mode 100644 index 0000000..a6772d2 --- /dev/null +++ b/board/toradex/common/tdx-eeprom.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (c) 2020 Toradex + */ + +#ifndef _TDX_EEPROM_H +#define _TDX_EEPROM_H + +#include <i2c_eeprom.h> + +int read_tdx_eeprom_data(u32 eeprom_id, int offset, uint8_t *buf, int size); +int write_tdx_eeprom_data(u32 eeprom_id, int offset, uint8_t *buf, int size); + +#endif /* _TDX_EEPROM_H */