diff options
| author | chenhui zhao <chenhui.zhao@freescale.com> | 2012-03-14 10:15:27 (GMT) |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2012-03-16 20:58:19 (GMT) |
| commit | ad68ee016d928975161f82619410296af8eba2e8 (patch) | |
| tree | c790fa449f778bc5e096815f82c4083485e41889 /arch | |
| parent | 04e358d896a7351c6cb453bcaa62cbbe99ae6c7c (diff) | |
| download | linux-ad68ee016d928975161f82619410296af8eba2e8.tar.xz | |
powerpc/85xx: mpc85xxcds - Fix PCI I/O space resource of PCI bridge
There is a PCI bridge(Tsi310) between the MPC8548 and a VIA
southbridge chip.
The bootloader sets the PCI bridge to open a window from 0x0000
to 0x1fff on the PCI I/O space. But the kernel can't set the I/O
resource. In the routine pci_read_bridge_io(), if the base which
is read from PCI_IO_BASE is equal to zero, the routine don't set
the I/O resource of the child bus.
To allow the legacy I/O space on the VIA southbridge to be accessed,
use the fixup to fix the PCI I/O space of the PCI bridge.
Signed-off-by: Zhao Chenhui <chenhui.zhao@freescale.com>
Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/platforms/85xx/mpc85xx_cds.c | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_cds.c b/arch/powerpc/platforms/85xx/mpc85xx_cds.c index 02d97e3..766b215 100644 --- a/arch/powerpc/platforms/85xx/mpc85xx_cds.c +++ b/arch/powerpc/platforms/85xx/mpc85xx_cds.c @@ -3,7 +3,7 @@ * * Maintained by Kumar Gala (see MAINTAINERS for contact information) * - * Copyright 2005 Freescale Semiconductor Inc. + * Copyright 2005, 2011-2012 Freescale Semiconductor Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the @@ -158,6 +158,33 @@ DECLARE_PCI_FIXUP_EARLY(0x1957, 0x3fff, skip_fake_bridge); DECLARE_PCI_FIXUP_EARLY(0x3fff, 0x1957, skip_fake_bridge); DECLARE_PCI_FIXUP_EARLY(0xff3f, 0x5719, skip_fake_bridge); +#define PCI_DEVICE_ID_IDT_TSI310 0x01a7 + +/* + * Fix Tsi310 PCI-X bridge resource. + * Force the bridge to open a window from 0x0000-0x1fff in PCI I/O space. + * This allows legacy I/O(i8259, etc) on the VIA southbridge to be accessed. + */ +void mpc85xx_cds_fixup_bus(struct pci_bus *bus) +{ + struct pci_dev *dev = bus->self; + struct resource *res = bus->resource[0]; + + if (dev != NULL && + dev->vendor == PCI_VENDOR_ID_IBM && + dev->device == PCI_DEVICE_ID_IDT_TSI310) { + if (res) { + res->start = 0; + res->end = 0x1fff; + res->flags = IORESOURCE_IO; + pr_info("mpc85xx_cds: PCI bridge resource fixup applied\n"); + pr_info("mpc85xx_cds: %pR\n", res); + } + } + + fsl_pcibios_fixup_bus(bus); +} + #ifdef CONFIG_PPC_I8259 static void mpc85xx_8259_cascade_handler(unsigned int irq, struct irq_desc *desc) @@ -322,7 +349,7 @@ define_machine(mpc85xx_cds) { .get_irq = mpic_get_irq, #ifdef CONFIG_PCI .restart = mpc85xx_cds_restart, - .pcibios_fixup_bus = fsl_pcibios_fixup_bus, + .pcibios_fixup_bus = mpc85xx_cds_fixup_bus, #else .restart = fsl_rstcr_restart, #endif |