LXR linux/drivers/net/ethernet/netronome/nfp/nfpcore/nfp

   1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2/* Copyright (C) 2015-2017 Netronome Systems, Inc. */
   3
   4/*
   5 * nfp_mip.c
   6 * Authors: Jakub Kicinski <jakub.kicinski@netronome.com>
   7 *          Jason McMullan <jason.mcmullan@netronome.com>
   8 *          Espen Skoglund <espen.skoglund@netronome.com>
   9 */
  10#include <linux/kernel.h>
  11#include <linux/slab.h>
  12
  13#include "nfp.h"
  14#include "nfp_cpp.h"
  15#include "nfp_nffw.h"
  16
  17#define NFP_MIP_SIGNATURE       cpu_to_le32(0x0050494d)  /* "MIP\0" */
  18#define NFP_MIP_VERSION         cpu_to_le32(1)
  19#define NFP_MIP_MAX_OFFSET      (256 * 1024)
  20
  21struct nfp_mip {
  22        __le32 signature;
  23        __le32 mip_version;
  24        __le32 mip_size;
  25        __le32 first_entry;
  26
  27        __le32 version;
  28        __le32 buildnum;
  29        __le32 buildtime;
  30        __le32 loadtime;
  31
  32        __le32 symtab_addr;
  33        __le32 symtab_size;
  34        __le32 strtab_addr;
  35        __le32 strtab_size;
  36
  37        char name[16];
  38        char toolchain[32];
  39};
  40
  41/* Read memory and check if it could be a valid MIP */
  42static int
  43nfp_mip_try_read(struct nfp_cpp *cpp, u32 cpp_id, u64 addr, struct nfp_mip *mip)
  44{
  45        int ret;
  46
  47        ret = nfp_cpp_read(cpp, cpp_id, addr, mip, sizeof(*mip));
  48        if (ret != sizeof(*mip)) {
  49                nfp_err(cpp, "Failed to read MIP data (%d, %zu)\n",
  50                        ret, sizeof(*mip));
  51                return -EIO;
  52        }
  53        if (mip->signature != NFP_MIP_SIGNATURE) {
  54                nfp_warn(cpp, "Incorrect MIP signature (0x%08x)\n",
  55                         le32_to_cpu(mip->signature));
  56                return -EINVAL;
  57        }
  58        if (mip->mip_version != NFP_MIP_VERSION) {
  59                nfp_warn(cpp, "Unsupported MIP version (%d)\n",
  60                         le32_to_cpu(mip->mip_version));
  61                return -EINVAL;
  62        }
  63
  64        return 0;
  65}
  66
  67/* Try to locate MIP using the resource table */
  68static int nfp_mip_read_resource(struct nfp_cpp *cpp, struct nfp_mip *mip)
  69{
  70        struct nfp_nffw_info *nffw_info;
  71        u32 cpp_id;
  72        u64 addr;
  73        int err;
  74
  75        nffw_info = nfp_nffw_info_open(cpp);
  76        if (IS_ERR(nffw_info))
  77                return PTR_ERR(nffw_info);
  78
  79        err = nfp_nffw_info_mip_first(nffw_info, &cpp_id, &addr);
  80        if (err)
  81                goto exit_close_nffw;
  82
  83        err = nfp_mip_try_read(cpp, cpp_id, addr, mip);
  84exit_close_nffw:
  85        nfp_nffw_info_close(nffw_info);
  86        return err;
  87}
  88
  89/**
  90 * nfp_mip_open() - Get device MIP structure
  91 * @cpp:        NFP CPP Handle
  92 *
  93 * Copy MIP structure from NFP device and return it.  The returned
  94 * structure is handled internally by the library and should be
  95 * freed by calling nfp_mip_close().
  96 *
  97 * Return: pointer to mip, NULL on failure.
  98 */
  99const struct nfp_mip *nfp_mip_open(struct nfp_cpp *cpp)
 100{
 101        struct nfp_mip *mip;
 102        int err;
 103
 104        mip = kmalloc(sizeof(*mip), GFP_KERNEL);
 105        if (!mip)
 106                return NULL;
 107
 108        err = nfp_mip_read_resource(cpp, mip);
 109        if (err) {
 110                kfree(mip);
 111                return NULL;
 112        }
 113
 114        mip->name[sizeof(mip->name) - 1] = 0;
 115
 116        return mip;
 117}
 118
 119void nfp_mip_close(const struct nfp_mip *mip)
 120{
 121        kfree(mip);
 122}
 123
 124const char *nfp_mip_name(const struct nfp_mip *mip)
 125{
 126        return mip->name;
 127}
 128
 129/**
 130 * nfp_mip_symtab() - Get the address and size of the MIP symbol table
 131 * @mip:        MIP handle
 132 * @addr:       Location for NFP DDR address of MIP symbol table
 133 * @size:       Location for size of MIP symbol table
 134 */
 135void nfp_mip_symtab(const struct nfp_mip *mip, u32 *addr, u32 *size)
 136{
 137        *addr = le32_to_cpu(mip->symtab_addr);
 138        *size = le32_to_cpu(mip->symtab_size);
 139}
 140
 141/**
 142 * nfp_mip_strtab() - Get the address and size of the MIP symbol name table
 143 * @mip:        MIP handle
 144 * @addr:       Location for NFP DDR address of MIP symbol name table
 145 * @size:       Location for size of MIP symbol name table
 146 */
 147void nfp_mip_strtab(const struct nfp_mip *mip, u32 *addr, u32 *size)
 148{
 149        *addr = le32_to_cpu(mip->strtab_addr);
 150        *size = le32_to_cpu(mip->strtab_size);
 151}
 152