Add support for the AMD/ATI SB600 southbridge SPI functionality
This has been tested by Uwe Hermann on an RS690/SB600 board.
Corresponding to flashrom svn r351 and coreboot v2 svn r3779.
Signed-off-by: Jason Wang <Qingpei.Wang@amd.com>
Reviewed-by: Joe Bao <zheng.bao@amd.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
diff --git a/chipset_enable.c b/chipset_enable.c
index 658313d..22eceb2 100644
--- a/chipset_enable.c
+++ b/chipset_enable.c
@@ -647,20 +647,35 @@
static int enable_flash_sb600(struct pci_dev *dev, const char *name)
{
- uint32_t old, new;
+ uint32_t tmp, low_bits, num;
uint8_t reg;
- /* Clear ROM Protect 0-3 */
- for (reg = 0x50; reg < 0x60; reg += 4) {
- old = pci_read_long(dev, reg);
- new = old & 0xFFFFFFFC;
- if (new != old) {
- pci_write_byte(dev, reg, new);
- if (pci_read_long(dev, reg) != new) {
- printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x50, new, name);
- }
- }
+ low_bits = tmp = pci_read_long(dev, 0xa0);
+ low_bits &= ~0xffffc000; /* for mmap aligning requirements */
+ low_bits &= 0xfffffff0; /* remove low 4 bits */
+ tmp &= 0xffffc000;
+ printf_debug("SPI base address is at 0x%x\n", tmp + low_bits);
+
+ sb600_spibar = mmap(0, 0x4000, PROT_READ | PROT_WRITE, MAP_SHARED,
+ fd_mem, (off_t)tmp);
+ if (sb600_spibar == MAP_FAILED) {
+ perror("Can't mmap memory using " MEM_DEV);
+ exit(1);
}
+ sb600_spibar += low_bits;
+
+ /* Clear ROM protect 0-3. */
+ for (reg = 0x50; reg < 0x60; reg += 4) {
+ num = pci_read_long(dev, reg);
+ num &= 0xfffffffc;
+ pci_write_byte(dev, reg, num);
+ }
+
+ flashbus = BUS_TYPE_SB600_SPI;
+
+ /* Enable SPI ROM in SB600 PM register. */
+ OUTB(0x8f, 0xcd6);
+ OUTB(0x0e, 0xcd7);
return 0;
}