diff options
author | Stefan Reinauer <stepan@coresystems.de> | 2010-02-27 01:50:21 +0000 |
---|---|---|
committer | Stefan Reinauer <stepan@openbios.org> | 2010-02-27 01:50:21 +0000 |
commit | 138be8315b63b0c8955159580d085e7621882b95 (patch) | |
tree | aabbcab390ea1e522524ff7e98d11ac752a051b5 /src/southbridge/intel/i82801dx/i82801dx_smbus.c | |
parent | be07eb29bc087a97903f72c2253442c285ce5942 (diff) |
This does the following:
cd coreboot/src/southbridge
svn mv i82801ca i82801cx
svn mv i82801dbm i82801dx
svn mv i82801er i82801ex
svn copy i82801xx i82801bx
svn mv i82801xx i82801ax
Plus, fixing up the filenames in these directories and the romstage.c and
Kconfig files of the mainboards using those drivers.
Plus, switching the thomson ip1000 and rca rm4100 to the i82801dx driver.
There's a lot more to be done, like
- adding device IDs for the ICH3 and newer drivers that have been kept in
i82801xx so far
- drop the additional parts support from the ax and bx drivers.
Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Joseph Smith <joe@settoplinux.org>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5167 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/southbridge/intel/i82801dx/i82801dx_smbus.c')
-rw-r--r-- | src/southbridge/intel/i82801dx/i82801dx_smbus.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/src/southbridge/intel/i82801dx/i82801dx_smbus.c b/src/southbridge/intel/i82801dx/i82801dx_smbus.c new file mode 100644 index 0000000000..e56a67c1e0 --- /dev/null +++ b/src/southbridge/intel/i82801dx/i82801dx_smbus.c @@ -0,0 +1,95 @@ +#include "i82801dx.h" +#include <smbus.h> +#include <pci.h> +#include <arch/io.h> + +#define PM_BUS 0 +#define PM_DEVFN PCI_DEVFN(0x1f,3) + +#if 0 +#define SMBUS_IO_BASE 0x1000 +#define SMBHSTSTAT 0 +#define SMBHSTCTL 2 +#define SMBHSTCMD 3 +#define SMBHSTADD 4 +#define SMBHSTDAT0 5 +#define SMBHSTDAT1 6 +#define SMBBLKDAT 7 +#endif + +void smbus_enable(void) +{ + unsigned char byte; + /* iobase addr */ + pcibios_write_config_dword(PM_BUS, PM_DEVFN, 0x20, SMBUS_IO_BASE | 1); + /* smbus enable */ + pcibios_write_config_byte(PM_BUS, PM_DEVFN, 0x40, 1); + /* iospace enable */ + pcibios_write_config_word(PM_BUS, PM_DEVFN, 0x4, 1); + + /* Disable interrupt generation */ + outb(0, SMBUS_IO_BASE + SMBHSTCTL); + +} + +void smbus_setup(void) +{ + outb(0, SMBUS_IO_BASE + SMBHSTSTAT); +} + +static void smbus_wait_until_ready(void) +{ + while((inb(SMBUS_IO_BASE + SMBHSTSTAT) & 1) == 1) { + /* nop */ + } +} + +static void smbus_wait_until_done(void) +{ + unsigned char byte; + do { + byte = inb(SMBUS_IO_BASE + SMBHSTSTAT); + } + while((byte &1) == 1); + while( (byte & ~1) == 0) { + byte = inb(SMBUS_IO_BASE + SMBHSTSTAT); + } +} + +int smbus_read_byte(unsigned device, unsigned address, unsigned char *result) +{ + unsigned char host_status_register; + unsigned char byte; + + smbus_wait_until_ready(); + + /* setup transaction */ + /* disable interrupts */ + outb(inb(SMBUS_IO_BASE + SMBHSTCTL) & (~1), SMBUS_IO_BASE + SMBHSTCTL); + /* set the device I'm talking too */ + outb(((device & 0x7f) << 1) | 1, SMBUS_IO_BASE + SMBHSTADD); + /* set the command/address... */ + outb(address & 0xFF, SMBUS_IO_BASE + SMBHSTCMD); + /* set up for a byte data read */ + outb((inb(SMBUS_IO_BASE + SMBHSTCTL) & 0xE3) | (0x2 << 2), SMBUS_IO_BASE + SMBHSTCTL); + + /* clear any lingering errors, so the transaction will run */ + outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT); + + /* clear the data byte...*/ + outb(0, SMBUS_IO_BASE + SMBHSTDAT0); + + /* start the command */ + outb((inb(SMBUS_IO_BASE + SMBHSTCTL) | 0x40), SMBUS_IO_BASE + SMBHSTCTL); + + /* poll for transaction completion */ + smbus_wait_until_done(); + + host_status_register = inb(SMBUS_IO_BASE + SMBHSTSTAT); + + /* read results of transaction */ + byte = inb(SMBUS_IO_BASE + SMBHSTDAT0); + + *result = byte; + return host_status_register != 0x02; +} |