1// SPDX-License-Identifier: GPL-2.0-only
2/* Atlantic Network Driver
3 *
4 * Copyright (C) 2014-2019 aQuantia Corporation
5 * Copyright (C) 2019-2020 Marvell International Ltd.
6 */
7
8/* File aq_hw_utils.c: Definitions of helper functions used across
9 * hardware layer.
10 */
11
12#include "aq_hw_utils.h"
13
14#include <linux/io-64-nonatomic-lo-hi.h>
15
16#include "aq_hw.h"
17#include "aq_nic.h"
18
19void aq_hw_write_reg_bit(struct aq_hw_s *aq_hw, u32 addr, u32 msk,
20 u32 shift, u32 val)
21{
22 if (msk ^ ~0) {
23 u32 reg_old, reg_new;
24
25 reg_old = aq_hw_read_reg(hw: aq_hw, reg: addr);
26 reg_new = (reg_old & (~msk)) | (val << shift);
27
28 if (reg_old != reg_new)
29 aq_hw_write_reg(hw: aq_hw, reg: addr, value: reg_new);
30 } else {
31 aq_hw_write_reg(hw: aq_hw, reg: addr, value: val);
32 }
33}
34
35u32 aq_hw_read_reg_bit(struct aq_hw_s *aq_hw, u32 addr, u32 msk, u32 shift)
36{
37 return ((aq_hw_read_reg(hw: aq_hw, reg: addr) & msk) >> shift);
38}
39
40u32 aq_hw_read_reg(struct aq_hw_s *hw, u32 reg)
41{
42 u32 value = readl(addr: hw->mmio + reg);
43
44 if (value == U32_MAX &&
45 readl(addr: hw->mmio + hw->aq_nic_cfg->aq_hw_caps->hw_alive_check_addr) == U32_MAX)
46 aq_utils_obj_set(flags: &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(val: value, addr: 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 */
60u64 aq_hw_read_reg64(struct aq_hw_s *hw, u32 reg)
61{
62 u64 value = U64_MAX;
63
64 if (hw->aq_nic_cfg->aq_hw_caps->op64bit)
65 value = readq(addr: hw->mmio + reg);
66 else
67 value = lo_hi_readq(addr: hw->mmio + reg);
68
69 if (value == U64_MAX &&
70 readl(addr: hw->mmio + hw->aq_nic_cfg->aq_hw_caps->hw_alive_check_addr) == U32_MAX)
71 aq_utils_obj_set(flags: &hw->flags, AQ_HW_FLAG_ERR_UNPLUG);
72
73 return value;
74}
75
76void aq_hw_write_reg64(struct aq_hw_s *hw, u32 reg, u64 value)
77{
78 if (hw->aq_nic_cfg->aq_hw_caps->op64bit)
79 writeq(val: value, addr: hw->mmio + reg);
80 else
81 lo_hi_writeq(val: value, addr: hw->mmio + reg);
82}
83
84int aq_hw_err_from_flags(struct aq_hw_s *hw)
85{
86 int err = 0;
87
88 if (aq_utils_obj_test(flags: &hw->flags, AQ_HW_FLAG_ERR_UNPLUG)) {
89 err = -ENXIO;
90 goto err_exit;
91 }
92 if (aq_utils_obj_test(flags: &hw->flags, AQ_HW_FLAG_ERR_HW)) {
93 err = -EIO;
94 goto err_exit;
95 }
96
97err_exit:
98 return err;
99}
100
101int aq_hw_num_tcs(struct aq_hw_s *hw)
102{
103 switch (hw->aq_nic_cfg->tc_mode) {
104 case AQ_TC_MODE_8TCS:
105 return 8;
106 case AQ_TC_MODE_4TCS:
107 return 4;
108 default:
109 break;
110 }
111
112 return 1;
113}
114
115int aq_hw_q_per_tc(struct aq_hw_s *hw)
116{
117 switch (hw->aq_nic_cfg->tc_mode) {
118 case AQ_TC_MODE_8TCS:
119 return 4;
120 case AQ_TC_MODE_4TCS:
121 return 8;
122 default:
123 return 4;
124 }
125}
126

source code of linux/drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.c