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do better error reporting in i82801dx early smbus functions. 

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5407 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Stefan Reinauer 2010-04-11 20:02:47 +00:00 committed by Stefan Reinauer
parent accb50a4e3
commit 4cc5af95b5
1 changed files with 8 additions and 13 deletions
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21
src/southbridge/intel/i82801dx/i82801dx_early_smbus.c
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@ -18,8 +18,7 @@
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
//#define SMBUS_IO_BASE 0x1000
//#define SMBUS_IO_BASE 0x0f00
#include "i82801dx.h"
#define SMBHSTSTAT 0x0
#define SMBHSTCTL 0x2
@ -42,7 +41,7 @@ static void enable_smbus(void)
{
device_t dev = PCI_DEV(0x0, 0x1f, 0x3);
print_debug("SMBus controller enabled\n");
printk(BIOS_DEBUG, "SMBus controller enabled\n");
/* set smbus iobase */
pci_write_config32(dev, 0x20, SMBUS_IO_BASE | 1);
/* Set smbus enable */
@ -118,9 +117,9 @@ static int smbus_read_byte(unsigned device, unsigned address)
unsigned char global_status_register;
unsigned char byte;
/*print_err("smbus_read_byte\n"); */
/* printk(BIOS_ERR, "smbus_read_byte\n"); */
if (smbus_wait_until_ready() < 0) {
print_err_hex8(-2);
printk(BIOS_ERR, "SMBUS not ready (%02x)\n", -2);
return -2;
}
@ -146,13 +145,13 @@ static int smbus_read_byte(unsigned device, unsigned address)
SMBUS_IO_BASE + SMBHSTCTL);
/* poll for it to start */
if (smbus_wait_until_active() < 0) {
print_err_hex8(-4);
printk(BIOS_ERR, "SMBUS not active (%02x)\n", -4);
return -4;
}
/* poll for transaction completion */
if (smbus_wait_until_done() < 0) {
print_err_hex8(-3);
printk(BIOS_ERR, "SMBUS not completed (%02x)\n", -3);
return -3;
}
@ -162,14 +161,10 @@ static int smbus_read_byte(unsigned device, unsigned address)
byte = inb(SMBUS_IO_BASE + SMBHSTDAT0);
if (global_status_register != 2) {
print_err_hex8(-1);
//printk(BIOS_SPEW, "%s: no device (%02x, %02x)\n", __func__, device, address);
return -1;
}
/*
print_err("smbus_read_byte: ");
print_err_hex32(device); print_err(" ad "); print_err_hex32(address);
print_err("value "); print_err_hex8(byte); print_err("\n");
*/
//printk(BIOS_DEBUG, "%s: %02x@%02x = %02x\n", __func__, device, address, byte);
return byte;
}