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i2c-i801: Document which chip support what feature 

Provide a clearer documentation of which additional features each
ICH chip support, and which of these the driver supports.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
hifive-unleashed-5.1
Jean Delvare 2008-01-27 18:14:49 +01:00 committed by Jean Delvare
parent 6d16bfb5e8
commit ae7b0497b8
1 changed files with 33 additions and 24 deletions
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57
drivers/i2c/busses/i2c-i801.c
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@ -21,25 +21,34 @@
*/
/*
SUPPORTED DEVICES PCI ID
82801AA 2413
82801AB 2423
82801BA 2443
82801CA/CAM 2483
82801DB 24C3 (HW PEC supported)
82801EB 24D3 (HW PEC supported)
6300ESB 25A4
ICH6 266A
ICH7 27DA
ESB2 269B
ICH8 283E
ICH9 2930
Tolapai 5032
This driver supports several versions of Intel's I/O Controller Hubs (ICH).
For SMBus support, they are similar to the PIIX4 and are part
of Intel's '810' and other chipsets.
See the file Documentation/i2c/busses/i2c-i801 for details.
I2C Block Read and Process Call are not supported.
Supports the following Intel I/O Controller Hubs (ICH):
I/O Block I2C
region SMBus Block proc. block
Chip name PCI ID size PEC buffer call read
----------------------------------------------------------------------
82801AA (ICH) 0x2413 16 no no no no
82801AB (ICH0) 0x2423 16 no no no no
82801BA (ICH2) 0x2443 16 no no no no
82801CA (ICH3) 0x2483 32 soft no no no
82801DB (ICH4) 0x24c3 32 hard yes no no
82801E (ICH5) 0x24d3 32 hard yes yes yes
6300ESB 0x25a4 32 hard yes yes yes
82801F (ICH6) 0x266a 32 hard yes yes yes
6310ESB/6320ESB 0x269b 32 hard yes yes yes
82801G (ICH7) 0x27da 32 hard yes yes yes
82801H (ICH8) 0x283e 32 hard yes yes yes
82801I (ICH9) 0x2930 32 hard yes yes yes
Tolapai 0x5032 32 hard yes ? ?
Features supported by this driver:
Software PEC no
Hardware PEC yes
Block buffer yes
Block process call transaction no
I2C block read transaction no
See the file Documentation/i2c/busses/i2c-i801 for details.
*/
/* Note: we assume there can only be one I801, with one SMBus interface */
@ -62,9 +71,9 @@
#define SMBHSTDAT0 (5 + i801_smba)
#define SMBHSTDAT1 (6 + i801_smba)
#define SMBBLKDAT (7 + i801_smba)
#define SMBPEC (8 + i801_smba) /* ICH4 only */
#define SMBAUXSTS (12 + i801_smba) /* ICH4 only */
#define SMBAUXCTL (13 + i801_smba) /* ICH4 only */
#define SMBPEC (8 + i801_smba) /* ICH3 and later */
#define SMBAUXSTS (12 + i801_smba) /* ICH4 and later */
#define SMBAUXCTL (13 + i801_smba) /* ICH4 and later */
/* PCI Address Constants */
#define SMBBAR 4
@ -91,13 +100,13 @@
#define I801_BYTE 0x04
#define I801_BYTE_DATA 0x08
#define I801_WORD_DATA 0x0C
#define I801_PROC_CALL 0x10 /* later chips only, unimplemented */
#define I801_PROC_CALL 0x10 /* unimplemented */
#define I801_BLOCK_DATA 0x14
#define I801_I2C_BLOCK_DATA 0x18 /* unimplemented */
#define I801_BLOCK_LAST 0x34
#define I801_I2C_BLOCK_LAST 0x38 /* unimplemented */
#define I801_START 0x40
#define I801_PEC_EN 0x80 /* ICH4 only */
#define I801_PEC_EN 0x80 /* ICH3 and later */
/* I801 Hosts Status register bits */
#define SMBHSTSTS_BYTE_DONE 0x80