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#include "aq_nic.h"
  17
  18void aq_hw_write_reg_bit(struct aq_hw_s *aq_hw, u32 addr, u32 msk,
  19                         u32 shift, u32 val)
  20{
  21        if (msk ^ ~0) {
  22                u32 reg_old, reg_new;
  23
  24                reg_old = aq_hw_read_reg(aq_hw, addr);
  25                reg_new = (reg_old & (~msk)) | (val << shift);
  26
  27                if (reg_old != reg_new)
  28                        aq_hw_write_reg(aq_hw, addr, reg_new);
  29        } else {
  30                aq_hw_write_reg(aq_hw, addr, val);
  31        }
  32}
  33
  34u32 aq_hw_read_reg_bit(struct aq_hw_s *aq_hw, u32 addr, u32 msk, u32 shift)
  35{
  36        return ((aq_hw_read_reg(aq_hw, addr) & msk) >> shift);
  37}
  38
  39u32 aq_hw_read_reg(struct aq_hw_s *hw, u32 reg)
  40{
  41        u32 value = readl(hw->mmio + reg);
  42
  43        if ((~0U) == value &&
  44            (~0U) == readl(hw->mmio +
  45                           hw->aq_nic_cfg->aq_hw_caps->hw_alive_check_addr))
  46                aq_utils_obj_set(&hw->flags, AQ_HW_FLAG_ERR_UNPLUG);
  47
  48        return value;
  49}
  50
  51void aq_hw_write_reg(struct aq_hw_s *hw, u32 reg, u32 value)
  52{
  53        writel(value, hw->mmio + reg);
  54}
  55
  56int aq_hw_err_from_flags(struct aq_hw_s *hw)
  57{
  58        int err = 0;
  59
  60        if (aq_utils_obj_test(&hw->flags, AQ_HW_FLAG_ERR_UNPLUG)) {
  61                err = -ENXIO;
  62                goto err_exit;
  63        }
  64        if (aq_utils_obj_test(&hw->flags, AQ_HW_FLAG_ERR_HW)) {
  65                err = -EIO;
  66                goto err_exit;
  67        }
  68
  69err_exit:
  70        return err;
  71}
  72