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Fix up and document the AMD CS5530/CS5530A support

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The previous code was pretty unreadable, undocumented and did some totally
unrelated things (such as mucking with the game port or port 0x92).

This version is tested with a 256 KB chip and should work for the
CS5530 and CS5530A.

Corresponding to flashrom svn r120 and coreboot v2 svn r2715.

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
This commit is contained in:
Uwe Hermann 2007-06-06 21:35:45 +00:00
parent e823ee0fc5
commit f4a673b0cf
2 changed files with 22 additions and 11 deletions
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2
README
View File

@ -150,7 +150,7 @@ Winbond W39V080A
Supported Southbridges
----------------------
AMD CS5530
AMD CS5530/CS5530A
AMD Geode SC1100
AMD AMD-8111
ATI SB400

31
chipset_enable.c
View File

@ -183,19 +183,30 @@ static int enable_flash_vt823x(struct pci_dev *dev, char *name)
static int enable_flash_cs5530(struct pci_dev *dev, char *name)
{
uint8_t new;
uint8_t reg8;
pci_write_byte(dev, 0x52, 0xee);
#define DECODE_CONTROL_REG2 0x5b /* F0 index 0x5b */
#define ROM_AT_LOGIC_CONTROL_REG 0x52 /* F0 index 0x52 */
new = pci_read_byte(dev, 0x52);
#define LOWER_ROM_ADDRESS_RANGE (1 << 0)
#define ROM_WRITE_ENABLE (1 << 1)
#define UPPER_ROM_ADDRESS_RANGE (1 << 2)
#define BIOS_ROM_POSITIVE_DECODE (1 << 5)
if (new != 0xee) {
printf("tried to set register 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x52, new, name);
return -1;
}
/* Decode 0x000E0000-0x000FFFFF (128 KB), not just 64 KB, and
* decode 0xFF000000-0xFFFFFFFF (16 MB), not just 256 KB.
* Make the configured ROM areas writable.
*/
reg8 = pci_read_byte(dev, ROM_AT_LOGIC_CONTROL_REG);
reg8 |= LOWER_ROM_ADDRESS_RANGE;
reg8 |= UPPER_ROM_ADDRESS_RANGE;
reg8 |= ROM_WRITE_ENABLE;
pci_write_byte(dev, ROM_AT_LOGIC_CONTROL_REG, reg8);
new = pci_read_byte(dev, 0x5b) | 0x20;
pci_write_byte(dev, 0x5b, new);
/* Set positive decode on ROM. */
reg8 = pci_read_byte(dev, DECODE_CONTROL_REG2);
reg8 |= BIOS_ROM_POSITIVE_DECODE;
pci_write_byte(dev, DECODE_CONTROL_REG2, reg8);
return 0;
}
@ -435,7 +446,7 @@ static FLASH_ENABLE enables[] = {
{0x1106, 0x3227, "VT8237", enable_flash_vt823x},
{0x1106, 0x8324, "CX700", enable_flash_vt823x},
{0x1106, 0x0686, "VT82C686", enable_flash_amd8111},
{0x1078, 0x0100, "CS5530", enable_flash_cs5530},
{0x1078, 0x0100, "CS5530/CS5530A", enable_flash_cs5530},
{0x100b, 0x0510, "SC1100", enable_flash_sc1100},
{0x1039, 0x0008, "SIS5595", enable_flash_sis5595},
{0x1022, 0x7468, "AMD8111", enable_flash_amd8111},