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intel/i945: Define peg_plugin for potential add-on PCIe card 

Change-Id: I06f6a7ed7a1ce935d154b8c7b11dcb81608329b9
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35677
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
This commit is contained in:
Kyösti Mälkki 2019-09-29 07:03:55 +03:00
parent 9137cbd5e4
commit 2647b6f9ba
1 changed files with 10 additions and 7 deletions
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17
src/northbridge/intel/i945/early_init.c
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@ -531,6 +531,9 @@ static void i945_setup_pci_express_x16(void)
u16 reg16;
pci_devfn_t p2peg = PCI_DEV(0, 0x01, 0);
u8 tmp_secondary = 0x0a;
pci_devfn_t peg_plugin = PCI_DEV(tmp_secondary, 0, 0);
printk(BIOS_DEBUG, "Enabling PCI Express x16 Link\n");
reg16 = pci_read_config16(PCI_DEV(0, 0x00, 0), DEVEN);
@ -562,10 +565,10 @@ static void i945_setup_pci_express_x16(void)
reg16 |= (1 << 4) | (1 << 0);
pci_write_config16(p2peg, SLOTSTS, reg16);
pci_write_config8(p2peg, SBUSN1, 0x00);
pci_write_config8(p2peg, SUBUSN1, 0x00);
pci_write_config8(p2peg, SBUSN1, 0x0a);
pci_write_config8(p2peg, SUBUSN1, 0x0a);
pci_write_config8(p2peg, PCI_SECONDARY_BUS, 0x00);
pci_write_config8(p2peg, PCI_SUBORDINATE_BUS, 0x00);
pci_write_config8(p2peg, PCI_SECONDARY_BUS, tmp_secondary);
pci_write_config8(p2peg, PCI_SUBORDINATE_BUS, tmp_secondary);
reg32 = pci_read_config32(p2peg, 0x224);
reg32 &= ~(1 << 8);
@ -597,7 +600,7 @@ static void i945_setup_pci_express_x16(void)
&& --timeout)
;
reg32 = pci_read_config32(PCI_DEV(0x0a, 0x0, 0), 0);
reg32 = pci_read_config32(peg_plugin, PCI_VENDOR_ID);
if (reg32 != 0x00000000 && reg32 != 0xffffffff) {
printk(BIOS_DEBUG, " Detected PCIe device %04x:%04x\n",
reg32 & 0xffff, reg32 >> 16);
@ -623,7 +626,7 @@ static void i945_setup_pci_express_x16(void)
&& --timeout)
;
reg32 = pci_read_config32(PCI_DEV(0xa, 0x00, 0), 0);
reg32 = pci_read_config32(peg_plugin, PCI_VENDOR_ID);
if (reg32 != 0x00000000 && reg32 != 0xffffffff) {
printk(BIOS_DEBUG, " Detected PCIe x1 device %04x:%04x\n",
reg32 & 0xffff, reg32 >> 16);
@ -651,7 +654,7 @@ static void i945_setup_pci_express_x16(void)
// TODO
/* pci_write_config32(p2peg, PEGTC, reg32); */
reg32 = (pci_read_config32(PCI_DEV(0xa, 0, 0), 0x8) >> 8);
reg32 = (pci_read_config32(peg_plugin, 0x8) >> 8);
printk(BIOS_DEBUG, "PCIe device class: %06x\n", reg32);
if (reg32 == 0x030000) {
printk(BIOS_DEBUG, "PCIe device is VGA. Disabling IGD.\n");