// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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/* Copyright (C) 2015-2017 Netronome Systems, Inc. */
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/*
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* nfp_mip.c
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* Authors: Jakub Kicinski <jakub.kicinski@netronome.com>
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* Jason McMullan <jason.mcmullan@netronome.com>
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* Espen Skoglund <espen.skoglund@netronome.com>
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include "nfp.h"
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#include "nfp_cpp.h"
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#include "nfp_nffw.h"
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#define NFP_MIP_SIGNATURE cpu_to_le32(0x0050494d) /* "MIP\0" */
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#define NFP_MIP_VERSION cpu_to_le32(1)
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#define NFP_MIP_MAX_OFFSET (256 * 1024)
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struct nfp_mip {
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__le32 signature;
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__le32 mip_version;
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__le32 mip_size;
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__le32 first_entry;
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__le32 version;
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__le32 buildnum;
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__le32 buildtime;
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__le32 loadtime;
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__le32 symtab_addr;
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__le32 symtab_size;
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__le32 strtab_addr;
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__le32 strtab_size;
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char name[16];
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char toolchain[32];
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};
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/* Read memory and check if it could be a valid MIP */
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static int
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nfp_mip_try_read(struct nfp_cpp *cpp, u32 cpp_id, u64 addr, struct nfp_mip *mip)
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{
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int ret;
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ret = nfp_cpp_read(cpp, cpp_id, addr, mip, sizeof(*mip));
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if (ret != sizeof(*mip)) {
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nfp_err(cpp, "Failed to read MIP data (%d, %zu)\n",
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ret, sizeof(*mip));
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return -EIO;
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}
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if (mip->signature != NFP_MIP_SIGNATURE) {
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nfp_warn(cpp, "Incorrect MIP signature (0x%08x)\n",
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le32_to_cpu(mip->signature));
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return -EINVAL;
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}
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if (mip->mip_version != NFP_MIP_VERSION) {
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nfp_warn(cpp, "Unsupported MIP version (%d)\n",
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le32_to_cpu(mip->mip_version));
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return -EINVAL;
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}
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return 0;
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}
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/* Try to locate MIP using the resource table */
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static int nfp_mip_read_resource(struct nfp_cpp *cpp, struct nfp_mip *mip)
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{
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struct nfp_nffw_info *nffw_info;
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u32 cpp_id;
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u64 addr;
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int err;
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nffw_info = nfp_nffw_info_open(cpp);
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if (IS_ERR(nffw_info))
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return PTR_ERR(nffw_info);
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err = nfp_nffw_info_mip_first(nffw_info, &cpp_id, &addr);
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if (err)
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goto exit_close_nffw;
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err = nfp_mip_try_read(cpp, cpp_id, addr, mip);
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exit_close_nffw:
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nfp_nffw_info_close(nffw_info);
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return err;
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}
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/**
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* nfp_mip_open() - Get device MIP structure
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* @cpp: NFP CPP Handle
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*
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* Copy MIP structure from NFP device and return it. The returned
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* structure is handled internally by the library and should be
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* freed by calling nfp_mip_close().
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*
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* Return: pointer to mip, NULL on failure.
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*/
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const struct nfp_mip *nfp_mip_open(struct nfp_cpp *cpp)
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{
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struct nfp_mip *mip;
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int err;
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mip = kmalloc(sizeof(*mip), GFP_KERNEL);
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if (!mip)
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return NULL;
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err = nfp_mip_read_resource(cpp, mip);
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if (err) {
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kfree(mip);
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return NULL;
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}
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mip->name[sizeof(mip->name) - 1] = 0;
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return mip;
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}
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void nfp_mip_close(const struct nfp_mip *mip)
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{
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kfree(mip);
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}
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const char *nfp_mip_name(const struct nfp_mip *mip)
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{
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return mip->name;
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}
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/**
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* nfp_mip_symtab() - Get the address and size of the MIP symbol table
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* @mip: MIP handle
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* @addr: Location for NFP DDR address of MIP symbol table
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* @size: Location for size of MIP symbol table
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*/
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void nfp_mip_symtab(const struct nfp_mip *mip, u32 *addr, u32 *size)
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{
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*addr = le32_to_cpu(mip->symtab_addr);
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*size = le32_to_cpu(mip->symtab_size);
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}
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/**
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* nfp_mip_strtab() - Get the address and size of the MIP symbol name table
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* @mip: MIP handle
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* @addr: Location for NFP DDR address of MIP symbol name table
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* @size: Location for size of MIP symbol name table
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*/
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void nfp_mip_strtab(const struct nfp_mip *mip, u32 *addr, u32 *size)
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{
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*addr = le32_to_cpu(mip->strtab_addr);
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*size = le32_to_cpu(mip->strtab_size);
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}
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