LXR linux/drivers/net/ethernet/aquantia/atlantic/aq_hw

   1/*
   2 * aQuantia Corporation Network Driver
   3 * Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved
   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
  10/* File aq_hw_utils.c: Definitions of helper functions used across
  11 * hardware layer.
  12 */
  13
  14#include "aq_hw_utils.h"
  15#include "aq_hw.h"
  16
  17void aq_hw_write_reg_bit(struct aq_hw_s *aq_hw, u32 addr, u32 msk,
  18                         u32 shift, u32 val)
  19{
  20        if (msk ^ ~0) {
  21                u32 reg_old, reg_new;
  22
  23                reg_old = aq_hw_read_reg(aq_hw, addr);
  24                reg_new = (reg_old & (~msk)) | (val << shift);
  25
  26                if (reg_old != reg_new)
  27                        aq_hw_write_reg(aq_hw, addr, reg_new);
  28        } else {
  29                aq_hw_write_reg(aq_hw, addr, val);
  30        }
  31}
  32
  33u32 aq_hw_read_reg_bit(struct aq_hw_s *aq_hw, u32 addr, u32 msk, u32 shift)
  34{
  35        return ((aq_hw_read_reg(aq_hw, addr) & msk) >> shift);
  36}
  37
  38u32 aq_hw_read_reg(struct aq_hw_s *hw, u32 reg)
  39{
  40        u32 value = readl(hw->mmio + reg);
  41
  42        if ((~0U) == value && (~0U) == readl(hw->mmio + hw->not_ff_addr))
  43                aq_utils_obj_set(&hw->header.flags, AQ_HW_FLAG_ERR_UNPLUG);
  44
  45        return value;
  46}
  47
  48void aq_hw_write_reg(struct aq_hw_s *hw, u32 reg, u32 value)
  49{
  50        writel(value, hw->mmio + reg);
  51}
  52
  53int aq_hw_err_from_flags(struct aq_hw_s *hw)
  54{
  55        int err = 0;
  56
  57        if (aq_utils_obj_test(&hw->header.flags, AQ_HW_FLAG_ERR_UNPLUG)) {
  58                err = -ENXIO;
  59                goto err_exit;
  60        }
  61        if (aq_utils_obj_test(&hw->header.flags, AQ_HW_FLAG_ERR_HW)) {
  62                err = -EIO;
  63                goto err_exit;
  64        }
  65
  66err_exit:
  67        return err;
  68}
  69