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
aq_hw_write_reg_bit(struct aq_hw_s * aq_hw,u32 addr,u32 msk,u32 shift,u32 val)17 void 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
aq_hw_read_reg_bit(struct aq_hw_s * aq_hw,u32 addr,u32 msk,u32 shift)33 u32 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
aq_hw_read_reg(struct aq_hw_s * hw,u32 reg)38 u32 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
aq_hw_write_reg(struct aq_hw_s * hw,u32 reg,u32 value)48 void aq_hw_write_reg(struct aq_hw_s *hw, u32 reg, u32 value)
49 {
50 writel(value, hw->mmio + reg);
51 }
52
aq_hw_err_from_flags(struct aq_hw_s * hw)53 int 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
66 err_exit:
67 return err;
68 }
69