1 // SPDX-License-Identifier: GPL-2.0
2 #include "tw5864.h"
3
tw5864_indir_writeb(struct tw5864_dev * dev,u16 addr,u8 data)4 void 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
tw5864_indir_readb(struct tw5864_dev * dev,u16 addr)18 u8 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 }
39