malta: setup PIIX4 interrupt route
Without setting up the PIRQ[A:D] interrupt routes, PCI interrupts will
be left disabled. Linux does not set up this routing but relies upon it
having been set up by the bootloader, reading back the IRQ lines which
the PIRQ[A:D] signals have been routed to.
This patch routes PIRQA & PIRQB to IRQ 10, and PIRQC & PIRQD to IRQ 11.
This matches the setup used by YAMON.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
diff --git a/board/imgtec/malta/malta.c b/board/imgtec/malta/malta.c
index 2f92259..a1a4c01 100644
--- a/board/imgtec/malta/malta.c
+++ b/board/imgtec/malta/malta.c
@@ -7,6 +7,7 @@
#include <common.h>
#include <netdev.h>
+#include <pci.h>
#include <pci_gt64120.h>
#include <pci_msc01.h>
#include <rtc.h>
@@ -169,6 +170,8 @@
void pci_init_board(void)
{
+ pci_dev_t bdf;
+
switch (malta_sys_con()) {
case SYSCON_GT64120:
set_io_port_base(CKSEG1ADDR(MALTA_GT_PCIIO_BASE));
@@ -191,4 +194,15 @@
0x00000000, MALTA_MSC01_PCIIO_SIZE);
break;
}
+
+ bdf = pci_find_device(PCI_VENDOR_ID_INTEL,
+ PCI_DEVICE_ID_INTEL_82371AB_0, 0);
+ if (bdf == -1)
+ panic("Failed to find PIIX4 PCI bridge\n");
+
+ /* setup PCI interrupt routing */
+ pci_write_config_byte(bdf, PCI_CFG_PIIX4_PIRQRCA, 10);
+ pci_write_config_byte(bdf, PCI_CFG_PIIX4_PIRQRCB, 10);
+ pci_write_config_byte(bdf, PCI_CFG_PIIX4_PIRQRCC, 11);
+ pci_write_config_byte(bdf, PCI_CFG_PIIX4_PIRQRCD, 11);
}