drivers/net/ethernet/huawei/hinic/hinic_common.c

   1 /*
   2  * Huawei HiNIC PCI Express Linux driver
   3  * Copyright(c) 2017 Huawei Technologies Co., Ltd
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/types.h>
  18 #include <asm/byteorder.h>
  19
  20 #include "hinic_common.h"
  21
  22 /**
  23  * hinic_cpu_to_be32 - convert data to big endian 32 bit format
  24  * @data: the data to convert
  25  * @len: length of data to convert
  26  **/
  27 void hinic_cpu_to_be32(void *data, int len)
  28 {
  29         u32 *mem = data;
  30         int i;
  31
  32         len = len / sizeof(u32);
  33
  34         for (i = 0; i < len; i++) {
  35                 *mem = cpu_to_be32(*mem);
  36                 mem++;
  37         }
  38 }
  39
  40 /**
  41  * hinic_be32_to_cpu - convert data from big endian 32 bit format
  42  * @data: the data to convert
  43  * @len: length of data to convert
  44  **/
  45 void hinic_be32_to_cpu(void *data, int len)
  46 {
  47         u32 *mem = data;
  48         int i;
  49
  50         len = len / sizeof(u32);
  51
  52         for (i = 0; i < len; i++) {
  53                 *mem = be32_to_cpu(*mem);
  54                 mem++;
  55         }
  56 }
  57
  58 /**
  59  * hinic_set_sge - set dma area in scatter gather entry
  60  * @sge: scatter gather entry
  61  * @addr: dma address
  62  * @len: length of relevant data in the dma address
  63  **/
  64 void hinic_set_sge(struct hinic_sge *sge, dma_addr_t addr, int len)
  65 {
  66         sge->hi_addr = upper_32_bits(addr);
  67         sge->lo_addr = lower_32_bits(addr);
  68         sge->len  = len;
  69 }
  70
  71 /**
  72  * hinic_sge_to_dma - get dma address from scatter gather entry
  73  * @sge: scatter gather entry
  74  *
  75  * Return dma address of sg entry
  76  **/
  77 dma_addr_t hinic_sge_to_dma(struct hinic_sge *sge)
  78 {
  79         return (dma_addr_t)((((u64)sge->hi_addr) << 32) | sge->lo_addr);
  80 }