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| author | Uwe Hermann <uwe@hermann-uwe.de> | 2007-06-06 21:35:45 +0000 |
|---|---|---|
| committer | Uwe Hermann <uwe@hermann-uwe.de> | 2007-06-06 21:35:45 +0000 |
| commit | f4a673b0cf819fb0ff7e2d446b52f50c10f42a2b (patch) | |
| tree | 6347ebe947e2ae22ab4c71c87d3a969de7eee5dc /chipset_enable.c | |
| parent | e823ee0fc5f772fac65435021b82517daf913d13 (diff) | |
| download | ast2050-flashrom-f4a673b0cf819fb0ff7e2d446b52f50c10f42a2b.zip ast2050-flashrom-f4a673b0cf819fb0ff7e2d446b52f50c10f42a2b.tar.gz | |
Fix up and document the AMD CS5530/CS5530A support
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>
Diffstat (limited to 'chipset_enable.c')
| -rw-r--r-- | chipset_enable.c | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/chipset_enable.c b/chipset_enable.c index b4deee3..e20e561 100644 --- a/chipset_enable.c +++ b/chipset_enable.c @@ -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}, |
