diff options
Diffstat (limited to 'drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.c')
| -rw-r--r-- | drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.c b/drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.c index d526c4f19d34..9c7a226d81b6 100644 --- a/drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.c +++ b/drivers/net/ethernet/aquantia/atlantic/aq_hw_utils.c @@ -1,10 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * aQuantia Corporation Network Driver * Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. */ /* File aq_hw_utils.c: Definitions of helper functions used across @@ -53,6 +50,18 @@ 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; |