diff options
Diffstat (limited to 'arch/mips/pci/fixup-cobalt.c')
| -rw-r--r-- | arch/mips/pci/fixup-cobalt.c | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/arch/mips/pci/fixup-cobalt.c b/arch/mips/pci/fixup-cobalt.c index a138e8ee5cfc..00206ff52988 100644 --- a/arch/mips/pci/fixup-cobalt.c +++ b/arch/mips/pci/fixup-cobalt.c @@ -13,7 +13,6 @@ #include <linux/kernel.h> #include <linux/init.h> -#include <asm/pci.h> #include <asm/io.h> #include <asm/gt64120.h> @@ -37,6 +36,21 @@ #define VIA_COBALT_BRD_ID_REG 0x94 #define VIA_COBALT_BRD_REG_to_ID(reg) ((unsigned char)(reg) >> 4) +/* + * Default value of PCI Class Code on GT64111 is PCI_CLASS_MEMORY_OTHER (0x0580) + * instead of PCI_CLASS_BRIDGE_HOST (0x0600). Galileo explained this choice in + * document "GT-64111 System Controller for RC4640, RM523X and VR4300 CPUs", + * section "6.5.3 PCI Autoconfiguration at RESET": + * + * Some PCs refuse to configure host bridges if they are found plugged into + * a PCI slot (ask the BIOS vendors why...). The "Memory Controller" Class + * Code does not cause a problem for these non-compliant BIOSes, so we used + * this as the default in the GT-64111. + * + * So fix the incorrect default value of PCI Class Code. More details are on: + * https://lore.kernel.org/r/20211102154831.xtrlgrmrizl5eidl@pali/ + * https://lore.kernel.org/r/20211102150201.GA11675@alpha.franken.de/ + */ static void qube_raq_galileo_early_fixup(struct pci_dev *dev) { if (dev->devfn == PCI_DEVFN(0, 0) && @@ -148,7 +162,7 @@ static void qube_raq_via_board_id_fixup(struct pci_dev *dev) DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_0, qube_raq_via_board_id_fixup); -static char irq_tab_qube1[] __initdata = { +static char irq_tab_qube1[] = { [COBALT_PCICONF_CPU] = 0, [COBALT_PCICONF_ETH0] = QUBE1_ETH0_IRQ, [COBALT_PCICONF_RAQSCSI] = SCSI_IRQ, @@ -157,7 +171,7 @@ static char irq_tab_qube1[] __initdata = { [COBALT_PCICONF_ETH1] = 0 }; -static char irq_tab_cobalt[] __initdata = { +static char irq_tab_cobalt[] = { [COBALT_PCICONF_CPU] = 0, [COBALT_PCICONF_ETH0] = ETH0_IRQ, [COBALT_PCICONF_RAQSCSI] = SCSI_IRQ, @@ -166,7 +180,7 @@ static char irq_tab_cobalt[] __initdata = { [COBALT_PCICONF_ETH1] = ETH1_IRQ }; -static char irq_tab_raq2[] __initdata = { +static char irq_tab_raq2[] = { [COBALT_PCICONF_CPU] = 0, [COBALT_PCICONF_ETH0] = ETH0_IRQ, [COBALT_PCICONF_RAQSCSI] = RAQ2_SCSI_IRQ, @@ -175,7 +189,7 @@ static char irq_tab_raq2[] __initdata = { [COBALT_PCICONF_ETH1] = ETH1_IRQ }; -int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) +int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) { if (cobalt_board_id <= COBALT_BRD_ID_QUBE1) return irq_tab_qube1[slot]; |