cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tw5864-util.c (930B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include "tw5864.h"
      3
      4void tw5864_indir_writeb(struct tw5864_dev *dev, u16 addr, u8 data)
      5{
      6	int retries = 30000;
      7
      8	while (tw_readl(TW5864_IND_CTL) & BIT(31) && --retries)
      9		;
     10	if (!retries)
     11		dev_err(&dev->pci->dev,
     12			"tw_indir_writel() retries exhausted before writing\n");
     13
     14	tw_writel(TW5864_IND_DATA, data);
     15	tw_writel(TW5864_IND_CTL, addr << 2 | TW5864_RW | TW5864_ENABLE);
     16}
     17
     18u8 tw5864_indir_readb(struct tw5864_dev *dev, u16 addr)
     19{
     20	int retries = 30000;
     21
     22	while (tw_readl(TW5864_IND_CTL) & BIT(31) && --retries)
     23		;
     24	if (!retries)
     25		dev_err(&dev->pci->dev,
     26			"tw_indir_readl() retries exhausted before reading\n");
     27
     28	tw_writel(TW5864_IND_CTL, addr << 2 | TW5864_ENABLE);
     29
     30	retries = 30000;
     31	while (tw_readl(TW5864_IND_CTL) & BIT(31) && --retries)
     32		;
     33	if (!retries)
     34		dev_err(&dev->pci->dev,
     35			"tw_indir_readl() retries exhausted at reading\n");
     36
     37	return tw_readl(TW5864_IND_DATA);
     38}