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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * aQuantia Corporation Network Driver
   4  * Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved
   5  */
   6
   7 /* File aq_hw_utils.c: Definitions of helper functions used across
   8  * hardware layer.
   9  */
  10
  11 #include "aq_hw_utils.h"
  12 #include "aq_hw.h"
  13 #include "aq_nic.h"
  14
  15 void aq_hw_write_reg_bit(struct aq_hw_s *aq_hw, u32 addr, u32 msk,
  16                          u32 shift, u32 val)
  17 {
  18         if (msk ^ ~0) {
  19                 u32 reg_old, reg_new;
  20
  21                 reg_old = aq_hw_read_reg(aq_hw, addr);
  22                 reg_new = (reg_old & (~msk)) | (val << shift);
  23
  24                 if (reg_old != reg_new)
  25                         aq_hw_write_reg(aq_hw, addr, reg_new);
  26         } else {
  27                 aq_hw_write_reg(aq_hw, addr, val);
  28         }
  29 }
  30
  31 u32 aq_hw_read_reg_bit(struct aq_hw_s *aq_hw, u32 addr, u32 msk, u32 shift)
  32 {
  33         return ((aq_hw_read_reg(aq_hw, addr) & msk) >> shift);
  34 }
  35
  36 u32 aq_hw_read_reg(struct aq_hw_s *hw, u32 reg)
  37 {
  38         u32 value = readl(hw->mmio + reg);
  39
  40         if ((~0U) == value &&
  41             (~0U) == readl(hw->mmio +
  42                            hw->aq_nic_cfg->aq_hw_caps->hw_alive_check_addr))
  43                 aq_utils_obj_set(&hw->flags, AQ_HW_FLAG_ERR_UNPLUG);
  44
  45         return value;
  46 }
  47
  48 void aq_hw_write_reg(struct aq_hw_s *hw, u32 reg, u32 value)
  49 {
  50         writel(value, hw->mmio + reg);
  51 }
  52
  53 /* Most of 64-bit registers are in LSW, MSW form.
  54    Counters are normally implemented by HW as latched pairs:
  55    reading LSW first locks MSW, to overcome LSW overflow
  56  */
  57 u64 aq_hw_read_reg64(struct aq_hw_s *hw, u32 reg)
  58 {
  59         u64 value = aq_hw_read_reg(hw, reg);
  60
  61         value |= (u64)aq_hw_read_reg(hw, reg + 4) << 32;
  62
  63         return value;
  64 }
  65
  66 int aq_hw_err_from_flags(struct aq_hw_s *hw)
  67 {
  68         int err = 0;
  69
  70         if (aq_utils_obj_test(&hw->flags, AQ_HW_FLAG_ERR_UNPLUG)) {
  71                 err = -ENXIO;
  72                 goto err_exit;
  73         }
  74         if (aq_utils_obj_test(&hw->flags, AQ_HW_FLAG_ERR_HW)) {
  75                 err = -EIO;
  76                 goto err_exit;
  77         }
  78
  79 err_exit:
  80         return err;
  81 }