diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-piix4.h')
| -rw-r--r-- | drivers/i2c/busses/i2c-piix4.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-piix4.h b/drivers/i2c/busses/i2c-piix4.h new file mode 100644 index 000000000000..36bc6ce82a27 --- /dev/null +++ b/drivers/i2c/busses/i2c-piix4.h @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * PIIX4/SB800 SMBus Interfaces + * + * Copyright (c) 2024, Advanced Micro Devices, Inc. + * All Rights Reserved. + * + * Authors: Shyam Sundar S K <Shyam-sundar.S-k@amd.com> + * Sanket Goswami <Sanket.Goswami@amd.com> + */ + +#ifndef I2C_PIIX4_H +#define I2C_PIIX4_H + +#include <linux/types.h> + +/* PIIX4 SMBus address offsets */ +#define SMBHSTSTS (0x00 + piix4_smba) +#define SMBHSLVSTS (0x01 + piix4_smba) +#define SMBHSTCNT (0x02 + piix4_smba) +#define SMBHSTCMD (0x03 + piix4_smba) +#define SMBHSTADD (0x04 + piix4_smba) +#define SMBHSTDAT0 (0x05 + piix4_smba) +#define SMBHSTDAT1 (0x06 + piix4_smba) +#define SMBBLKDAT (0x07 + piix4_smba) +#define SMBSLVCNT (0x08 + piix4_smba) +#define SMBSHDWCMD (0x09 + piix4_smba) +#define SMBSLVEVT (0x0A + piix4_smba) +#define SMBSLVDAT (0x0C + piix4_smba) + +/* PIIX4 constants */ +#define PIIX4_BLOCK_DATA 0x14 + +struct sb800_mmio_cfg { + void __iomem *addr; + bool use_mmio; +}; + +int piix4_sb800_port_sel(u8 port, struct sb800_mmio_cfg *mmio_cfg); +int piix4_transaction(struct i2c_adapter *piix4_adapter, unsigned short piix4_smba); +int piix4_sb800_region_request(struct device *dev, struct sb800_mmio_cfg *mmio_cfg); +void piix4_sb800_region_release(struct device *dev, struct sb800_mmio_cfg *mmio_cfg); + +#endif /* I2C_PIIX4_H */ |