pci/tw5864/tw5864-util.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include "tw5864.h"
0003
0004 void tw5864_indir_writeb(struct tw5864_dev *dev, u16 addr, u8 data)
0005 {
0006     int retries = 30000;
0007
0008     while (tw_readl(TW5864_IND_CTL) & BIT(31) && --retries)
0009         ;
0010     if (!retries)
0011         dev_err(&dev->pci->dev,
0012             "tw_indir_writel() retries exhausted before writing\n");
0013
0014     tw_writel(TW5864_IND_DATA, data);
0015     tw_writel(TW5864_IND_CTL, addr << 2 | TW5864_RW | TW5864_ENABLE);
0016 }
0017
0018 u8 tw5864_indir_readb(struct tw5864_dev *dev, u16 addr)
0019 {
0020     int retries = 30000;
0021
0022     while (tw_readl(TW5864_IND_CTL) & BIT(31) && --retries)
0023         ;
0024     if (!retries)
0025         dev_err(&dev->pci->dev,
0026             "tw_indir_readl() retries exhausted before reading\n");
0027
0028     tw_writel(TW5864_IND_CTL, addr << 2 | TW5864_ENABLE);
0029
0030     retries = 30000;
0031     while (tw_readl(TW5864_IND_CTL) & BIT(31) && --retries)
0032         ;
0033     if (!retries)
0034         dev_err(&dev->pci->dev,
0035             "tw_indir_readl() retries exhausted at reading\n");
0036
0037     return tw_readl(TW5864_IND_DATA);
0038 }