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// SPDX-License-Identifier: GPL-2.0-only
/*
* aQuantia Corporation Network Driver
* Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved
*/
/* File aq_hw_utils.c: Definitions of helper functions used across
* hardware layer.
*/
#include "aq_hw_utils.h"
#include "aq_hw.h"
#include "aq_nic.h"
void aq_hw_write_reg_bit(struct aq_hw_s *aq_hw, u32 addr, u32 msk,
u32 shift, u32 val)
{
if (msk ^ ~0) {
u32 reg_old, reg_new;
reg_old = aq_hw_read_reg(aq_hw, addr);
reg_new = (reg_old & (~msk)) | (val << shift);
if (reg_old != reg_new)
aq_hw_write_reg(aq_hw, addr, reg_new);
} else {
aq_hw_write_reg(aq_hw, addr, val);
}
}
u32 aq_hw_read_reg_bit(struct aq_hw_s *aq_hw, u32 addr, u32 msk, u32 shift)
{
return ((aq_hw_read_reg(aq_hw, addr) & msk) >> shift);
}
u32 aq_hw_read_reg(struct aq_hw_s *hw, u32 reg)
{
u32 value = readl(hw->mmio + reg);
if ((~0U) == value &&
(~0U) == readl(hw->mmio +
hw->aq_nic_cfg->aq_hw_caps->hw_alive_check_addr))
aq_utils_obj_set(&hw->flags, AQ_HW_FLAG_ERR_UNPLUG);
return value;
}
void aq_hw_write_reg(struct aq_hw_s *hw, u32 reg, u32 value)
{
writel(value, hw->mmio + reg);
}
/* Most of 64-bit registers are in LSW, MSW form.
Counters are normally implemented by HW as latched pairs:
reading LSW first locks MSW, to overcome LSW overflow
*/
u64 aq_hw_read_reg64(struct aq_hw_s *hw, u32 reg)
{
u64 value = aq_hw_read_reg(hw, reg);
value |= (u64)aq_hw_read_reg(hw, reg + 4) << 32;
return value;
}
int aq_hw_err_from_flags(struct aq_hw_s *hw)
{
int err = 0;
if (aq_utils_obj_test(&hw->flags, AQ_HW_FLAG_ERR_UNPLUG)) {
err = -ENXIO;
goto err_exit;
}
if (aq_utils_obj_test(&hw->flags, AQ_HW_FLAG_ERR_HW)) {
err = -EIO;
goto err_exit;
}
err_exit:
return err;
}
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