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
aq_hw_write_reg_bit(struct aq_hw_s * aq_hw,u32 addr,u32 msk,u32 shift,u32 val)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
aq_hw_read_reg_bit(struct aq_hw_s * aq_hw,u32 addr,u32 msk,u32 shift)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
aq_hw_read_reg(struct aq_hw_s * hw,u32 reg)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
aq_hw_write_reg(struct aq_hw_s * hw,u32 reg,u32 value)51 void aq_hw_write_reg(struct aq_hw_s *hw, u32 reg, u32 value)
52 {
53 writel(value, hw->mmio + reg);
54 }
55
aq_hw_err_from_flags(struct aq_hw_s * hw)56 int 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
69 err_exit:
70 return err;
71 }
72
