Igor Opaniuk | dcb531b | 2020-07-15 13:30:53 +0300 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Copyright (c) 2020 Toradex |
| 4 | */ |
| 5 | |
| 6 | #include <dm.h> |
| 7 | #include <i2c_eeprom.h> |
| 8 | #include <linux/errno.h> |
| 9 | |
| 10 | DECLARE_GLOBAL_DATA_PTR; |
| 11 | |
| 12 | static int get_tdx_eeprom(u32 eeprom_id, struct udevice **devp) |
| 13 | { |
| 14 | int ret = 0; |
| 15 | int node; |
| 16 | ofnode eeprom; |
| 17 | char eeprom_str[16]; |
| 18 | const char *path; |
| 19 | |
| 20 | if (!gd->fdt_blob) { |
| 21 | printf("%s: don't have a valid gd->fdt_blob!\n", __func__); |
| 22 | return -EFAULT; |
| 23 | } |
| 24 | |
| 25 | node = fdt_path_offset(gd->fdt_blob, "/aliases"); |
| 26 | if (node < 0) |
| 27 | return -ENODEV; |
| 28 | |
| 29 | sprintf(eeprom_str, "eeprom%d", eeprom_id); |
| 30 | |
| 31 | path = fdt_getprop(gd->fdt_blob, node, eeprom_str, NULL); |
| 32 | if (!path) { |
| 33 | printf("%s: no alias for %s\n", __func__, eeprom_str); |
| 34 | return -ENODEV; |
| 35 | } |
| 36 | |
| 37 | eeprom = ofnode_path(path); |
| 38 | if (!ofnode_valid(eeprom)) { |
| 39 | printf("%s: invalid hardware path to EEPROM\n", __func__); |
| 40 | return -ENODEV; |
| 41 | } |
| 42 | |
| 43 | ret = uclass_get_device_by_ofnode(UCLASS_I2C_EEPROM, eeprom, devp); |
| 44 | if (ret) { |
| 45 | printf("%s: cannot find EEPROM by node\n", __func__); |
| 46 | return ret; |
| 47 | } |
| 48 | |
| 49 | return ret; |
| 50 | } |
| 51 | |
| 52 | int read_tdx_eeprom_data(u32 eeprom_id, int offset, u8 *buf, |
| 53 | int size) |
| 54 | { |
| 55 | struct udevice *dev; |
| 56 | int ret; |
| 57 | |
| 58 | ret = get_tdx_eeprom(eeprom_id, &dev); |
| 59 | if (ret) |
| 60 | return ret; |
| 61 | |
| 62 | ret = i2c_eeprom_read(dev, 0x0, buf, size); |
| 63 | if (ret) { |
| 64 | printf("%s: error reading data from EEPROM id: %d!, ret = %d\n", |
| 65 | __func__, eeprom_id, ret); |
| 66 | return ret; |
| 67 | } |
| 68 | |
| 69 | return ret; |
| 70 | } |
| 71 | |
| 72 | int write_tdx_eeprom_data(u32 eeprom_id, int offset, u8 *buf, |
| 73 | int size) |
| 74 | { |
| 75 | struct udevice *dev; |
| 76 | int ret; |
| 77 | |
| 78 | ret = get_tdx_eeprom(eeprom_id, &dev); |
| 79 | if (ret) |
| 80 | return ret; |
| 81 | |
| 82 | ret = i2c_eeprom_write(dev, 0x0, buf, size); |
| 83 | if (ret) { |
| 84 | printf("%s: error writing data to EEPROM id: %d, ret = %d\n", |
| 85 | __func__, eeprom_id, ret); |
| 86 | return ret; |
| 87 | } |
| 88 | |
| 89 | return ret; |
| 90 | } |