drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.c

   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
  18 void 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
  34 u32 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
  39 u32 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
  51 void aq_hw_write_reg(struct aq_hw_s *hw, u32 reg, u32 value)
  52 {
  53         writel(value, hw->mmio + reg);
  54 }
  55
  56 /* Most of 64-bit registers are in LSW, MSW form.
  57    Counters are normally implemented by HW as latched pairs:
  58    reading LSW first locks MSW, to overcome LSW overflow
  59  */
  60 u64 aq_hw_read_reg64(struct aq_hw_s *hw, u32 reg)
  61 {
  62         u64 value = aq_hw_read_reg(hw, reg);
  63
  64         value |= (u64)aq_hw_read_reg(hw, reg + 4) << 32;
  65         return value;
  66 }
  67
  68 int aq_hw_err_from_flags(struct aq_hw_s *hw)
  69 {
  70         int err = 0;
  71
  72         if (aq_utils_obj_test(&hw->flags, AQ_HW_FLAG_ERR_UNPLUG)) {
  73                 err = -ENXIO;
  74                 goto err_exit;
  75         }
  76         if (aq_utils_obj_test(&hw->flags, AQ_HW_FLAG_ERR_HW)) {
  77                 err = -EIO;
  78                 goto err_exit;
  79         }
  80
  81 err_exit:
  82         return err;
  83 }