diff options
Diffstat (limited to 'drivers/media/pci/tw5864/tw5864-util.c')
| -rw-r--r-- | drivers/media/pci/tw5864/tw5864-util.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/media/pci/tw5864/tw5864-util.c b/drivers/media/pci/tw5864/tw5864-util.c new file mode 100644 index 000000000..b9cebe9d1 --- /dev/null +++ b/drivers/media/pci/tw5864/tw5864-util.c @@ -0,0 +1,38 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "tw5864.h" + +void tw5864_indir_writeb(struct tw5864_dev *dev, u16 addr, u8 data) +{ + int retries = 30000; + + while (tw_readl(TW5864_IND_CTL) & BIT(31) && --retries) + ; + if (!retries) + dev_err(&dev->pci->dev, + "tw_indir_writel() retries exhausted before writing\n"); + + tw_writel(TW5864_IND_DATA, data); + tw_writel(TW5864_IND_CTL, addr << 2 | TW5864_RW | TW5864_ENABLE); +} + +u8 tw5864_indir_readb(struct tw5864_dev *dev, u16 addr) +{ + int retries = 30000; + + while (tw_readl(TW5864_IND_CTL) & BIT(31) && --retries) + ; + if (!retries) + dev_err(&dev->pci->dev, + "tw_indir_readl() retries exhausted before reading\n"); + + tw_writel(TW5864_IND_CTL, addr << 2 | TW5864_ENABLE); + + retries = 30000; + while (tw_readl(TW5864_IND_CTL) & BIT(31) && --retries) + ; + if (!retries) + dev_err(&dev->pci->dev, + "tw_indir_readl() retries exhausted at reading\n"); + + return tw_readl(TW5864_IND_DATA); +} |