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- // SPDX-License-Identifier: GPL-2.0
- /*
- * NVM helpers
- *
- * Copyright (C) 2020, Intel Corporation
- * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
- */
- #include <linux/idr.h>
- #include <linux/slab.h>
- #include <linux/vmalloc.h>
- #include "tb.h"
- static DEFINE_IDA(nvm_ida);
- /**
- * tb_nvm_alloc() - Allocate new NVM structure
- * @dev: Device owning the NVM
- *
- * Allocates new NVM structure with unique @id and returns it. In case
- * of error returns ERR_PTR().
- */
- struct tb_nvm *tb_nvm_alloc(struct device *dev)
- {
- struct tb_nvm *nvm;
- int ret;
- nvm = kzalloc(sizeof(*nvm), GFP_KERNEL);
- if (!nvm)
- return ERR_PTR(-ENOMEM);
- ret = ida_simple_get(&nvm_ida, 0, 0, GFP_KERNEL);
- if (ret < 0) {
- kfree(nvm);
- return ERR_PTR(ret);
- }
- nvm->id = ret;
- nvm->dev = dev;
- return nvm;
- }
- /**
- * tb_nvm_add_active() - Adds active NVMem device to NVM
- * @nvm: NVM structure
- * @size: Size of the active NVM in bytes
- * @reg_read: Pointer to the function to read the NVM (passed directly to the
- * NVMem device)
- *
- * Registers new active NVmem device for @nvm. The @reg_read is called
- * directly from NVMem so it must handle possible concurrent access if
- * needed. The first parameter passed to @reg_read is @nvm structure.
- * Returns %0 in success and negative errno otherwise.
- */
- int tb_nvm_add_active(struct tb_nvm *nvm, size_t size, nvmem_reg_read_t reg_read)
- {
- struct nvmem_config config;
- struct nvmem_device *nvmem;
- memset(&config, 0, sizeof(config));
- config.name = "nvm_active";
- config.reg_read = reg_read;
- config.read_only = true;
- config.id = nvm->id;
- config.stride = 4;
- config.word_size = 4;
- config.size = size;
- config.dev = nvm->dev;
- config.owner = THIS_MODULE;
- config.priv = nvm;
- nvmem = nvmem_register(&config);
- if (IS_ERR(nvmem))
- return PTR_ERR(nvmem);
- nvm->active = nvmem;
- return 0;
- }
- /**
- * tb_nvm_write_buf() - Write data to @nvm buffer
- * @nvm: NVM structure
- * @offset: Offset where to write the data
- * @val: Data buffer to write
- * @bytes: Number of bytes to write
- *
- * Helper function to cache the new NVM image before it is actually
- * written to the flash. Copies @bytes from @val to @nvm->buf starting
- * from @offset.
- */
- int tb_nvm_write_buf(struct tb_nvm *nvm, unsigned int offset, void *val,
- size_t bytes)
- {
- if (!nvm->buf) {
- nvm->buf = vmalloc(NVM_MAX_SIZE);
- if (!nvm->buf)
- return -ENOMEM;
- }
- nvm->flushed = false;
- nvm->buf_data_size = offset + bytes;
- memcpy(nvm->buf + offset, val, bytes);
- return 0;
- }
- /**
- * tb_nvm_add_non_active() - Adds non-active NVMem device to NVM
- * @nvm: NVM structure
- * @size: Size of the non-active NVM in bytes
- * @reg_write: Pointer to the function to write the NVM (passed directly
- * to the NVMem device)
- *
- * Registers new non-active NVmem device for @nvm. The @reg_write is called
- * directly from NVMem so it must handle possible concurrent access if
- * needed. The first parameter passed to @reg_write is @nvm structure.
- * Returns %0 in success and negative errno otherwise.
- */
- int tb_nvm_add_non_active(struct tb_nvm *nvm, size_t size,
- nvmem_reg_write_t reg_write)
- {
- struct nvmem_config config;
- struct nvmem_device *nvmem;
- memset(&config, 0, sizeof(config));
- config.name = "nvm_non_active";
- config.reg_write = reg_write;
- config.root_only = true;
- config.id = nvm->id;
- config.stride = 4;
- config.word_size = 4;
- config.size = size;
- config.dev = nvm->dev;
- config.owner = THIS_MODULE;
- config.priv = nvm;
- nvmem = nvmem_register(&config);
- if (IS_ERR(nvmem))
- return PTR_ERR(nvmem);
- nvm->non_active = nvmem;
- return 0;
- }
- /**
- * tb_nvm_free() - Release NVM and its resources
- * @nvm: NVM structure to release
- *
- * Releases NVM and the NVMem devices if they were registered.
- */
- void tb_nvm_free(struct tb_nvm *nvm)
- {
- if (nvm) {
- if (nvm->non_active)
- nvmem_unregister(nvm->non_active);
- if (nvm->active)
- nvmem_unregister(nvm->active);
- vfree(nvm->buf);
- ida_simple_remove(&nvm_ida, nvm->id);
- }
- kfree(nvm);
- }
- void tb_nvm_exit(void)
- {
- ida_destroy(&nvm_ida);
- }
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