126 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/* Atlantic Network Driver3 *4 * Copyright (C) 2014-2019 aQuantia Corporation5 * Copyright (C) 2019-2020 Marvell International Ltd.6 */7 8/* File aq_hw_utils.c: Definitions of helper functions used across9 * 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(aq_hw, addr);26 reg_new = (reg_old & (~msk)) | (val << shift);27 28 if (reg_old != reg_new)29 aq_hw_write_reg(aq_hw, addr, reg_new);30 } else {31 aq_hw_write_reg(aq_hw, addr, 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(aq_hw, addr) & msk) >> shift);38}39 40u32 aq_hw_read_reg(struct aq_hw_s *hw, u32 reg)41{42 u32 value = readl(hw->mmio + reg);43 44 if (value == U32_MAX &&45 readl(hw->mmio + hw->aq_nic_cfg->aq_hw_caps->hw_alive_check_addr) == U32_MAX)46 aq_utils_obj_set(&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(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 overflow59 */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(hw->mmio + reg);66 else67 value = lo_hi_readq(hw->mmio + reg);68 69 if (value == U64_MAX &&70 readl(hw->mmio + hw->aq_nic_cfg->aq_hw_caps->hw_alive_check_addr) == U32_MAX)71 aq_utils_obj_set(&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(value, hw->mmio + reg);80 else81 lo_hi_writeq(value, 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(&hw->flags, AQ_HW_FLAG_ERR_UNPLUG)) {89 err = -ENXIO;90 goto err_exit;91 }92 if (aq_utils_obj_test(&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