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powerpc/85xx: mpc85xxcds - Fix PCI I/O space resource of PCI bridge

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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>
This commit is contained in:
chenhui zhao 2012-03-14 18:15:27 +08:00 committed by Kumar Gala
parent 04e358d896
commit ad68ee016d
1 changed files with 29 additions and 2 deletions
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31
arch/powerpc/platforms/85xx/mpc85xx_cds.c
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@ -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