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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | // SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2022 Sean Anderson <sean.anderson@seco.com> */ #include <common.h> #include <i2c_eeprom.h> #include <linker_lists.h> #include <misc.h> #include <nvmem.h> #include <rtc.h> #include <dm/device_compat.h> #include <dm/ofnode.h> #include <dm/read.h> #include <dm/uclass.h> int nvmem_cell_read(struct nvmem_cell *cell, void *buf, size_t size) { dev_dbg(cell->nvmem, "%s: off=%u size=%zu\n", __func__, cell->offset, size); if (size != cell->size) return -EINVAL; switch (cell->nvmem->driver->id) { case UCLASS_I2C_EEPROM: return i2c_eeprom_read(cell->nvmem, cell->offset, buf, size); case UCLASS_MISC: { int ret = misc_read(cell->nvmem, cell->offset, buf, size); if (ret < 0) return ret; if (ret != size) return -EIO; return 0; } case UCLASS_RTC: return dm_rtc_read(cell->nvmem, cell->offset, buf, size); default: return -ENOSYS; } } int nvmem_cell_write(struct nvmem_cell *cell, const void *buf, size_t size) { dev_dbg(cell->nvmem, "%s: off=%u size=%zu\n", __func__, cell->offset, size); if (size != cell->size) return -EINVAL; switch (cell->nvmem->driver->id) { case UCLASS_I2C_EEPROM: return i2c_eeprom_write(cell->nvmem, cell->offset, buf, size); case UCLASS_MISC: { int ret = misc_write(cell->nvmem, cell->offset, buf, size); if (ret < 0) return ret; if (ret != size) return -EIO; return 0; } case UCLASS_RTC: return dm_rtc_write(cell->nvmem, cell->offset, buf, size); default: return -ENOSYS; } } /** * nvmem_get_device() - Get an nvmem device for a cell * @node: ofnode of the nvmem device * @cell: Cell to look up * * Try to find a nvmem-compatible device by going through the nvmem interfaces. * * Return: * * 0 on success * * -ENODEV if we didn't find anything * * A negative error if there was a problem looking up the device */ static int nvmem_get_device(ofnode node, struct nvmem_cell *cell) { int i, ret; enum uclass_id ids[] = { UCLASS_I2C_EEPROM, UCLASS_MISC, UCLASS_RTC, }; for (i = 0; i < ARRAY_SIZE(ids); i++) { ret = uclass_get_device_by_ofnode(ids[i], node, &cell->nvmem); if (!ret) return 0; if (ret != -ENODEV && ret != -EPFNOSUPPORT) return ret; } return -ENODEV; } int nvmem_cell_get_by_index(struct udevice *dev, int index, struct nvmem_cell *cell) { fdt_addr_t offset; fdt_size_t size = FDT_SIZE_T_NONE; int ret; struct ofnode_phandle_args args; dev_dbg(dev, "%s: index=%d\n", __func__, index); ret = dev_read_phandle_with_args(dev, "nvmem-cells", NULL, 0, index, &args); if (ret) return ret; ret = nvmem_get_device(ofnode_get_parent(args.node), cell); if (ret) return ret; offset = ofnode_get_addr_size_index_notrans(args.node, 0, &size); if (offset == FDT_ADDR_T_NONE || size == FDT_SIZE_T_NONE) { dev_dbg(cell->nvmem, "missing address or size for %s\n", ofnode_get_name(args.node)); return -EINVAL; } cell->offset = offset; cell->size = size; return 0; } int nvmem_cell_get_by_name(struct udevice *dev, const char *name, struct nvmem_cell *cell) { int index; dev_dbg(dev, "%s, name=%s\n", __func__, name); index = dev_read_stringlist_search(dev, "nvmem-cell-names", name); if (index < 0) return index; return nvmem_cell_get_by_index(dev, index, cell); } |