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* [PATCH 2/9] powerpc/mpc85xxcds: Fix PCI I/O space resource of PCI bridge
@ 2012-03-06  9:06 Zhao Chenhui
  2012-03-06  9:06 ` [PATCH 3/9] l2sram: Add compatible entry for mpc8548 Zhao Chenhui
                   ` (7 more replies)
  0 siblings, 8 replies; 20+ messages in thread
From: Zhao Chenhui @ 2012-03-06  9:06 UTC (permalink / raw)
  To: linuxppc-dev

From: chenhui zhao <chenhui.zhao@freescale.com>

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>
---
 arch/powerpc/platforms/85xx/mpc85xx_cds.c |   29 +++++++++++++++++++++++++++--
 1 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/85xx/mpc85xx_cds.c b/arch/powerpc/platforms/85xx/mpc85xx_cds.c
index 40f03da..c009c5b 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 +158,31 @@ 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);
 
+/*
+ * 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_IBM_PCIX_BRIDGE) {
+		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)
@@ -323,7 +348,7 @@ 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
-- 
1.6.4.1

^ permalink raw reply related	[flat|nested] 20+ messages in thread

end of thread, other threads:[~2012-03-16 20:23 UTC | newest]

Thread overview: 20+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-03-06  9:06 [PATCH 2/9] powerpc/mpc85xxcds: Fix PCI I/O space resource of PCI bridge Zhao Chenhui
2012-03-06  9:06 ` [PATCH 3/9] l2sram: Add compatible entry for mpc8548 Zhao Chenhui
2012-03-06  9:06 ` [PATCH 4/9] powerpc/mpc8548cds: Add NOR flash node to dts Zhao Chenhui
2012-03-16 20:22   ` Kumar Gala
2012-03-06  9:06 ` [PATCH 5/9] powerpc/mpc8548cds: Add RapidIO " Zhao Chenhui
2012-03-16 20:23   ` Kumar Gala
2012-03-06  9:06 ` [PATCH 6/9] powerpc/mpc8548cds: Add FPGA " Zhao Chenhui
2012-03-06 12:16   ` Kumar Gala
2012-03-07 16:22   ` Tabi Timur-B04825
2012-03-07 16:24   ` Timur Tabi
2012-03-16 20:22   ` Kumar Gala
2012-03-06  9:06 ` [PATCH 7/9] powerpc/mpc8548cds: fix alias in mpc8548si-pre.dtsi Zhao Chenhui
2012-03-16 20:23   ` Kumar Gala
2012-03-06  9:06 ` [PATCH 8/9] powerpc/mpc8548cds: rename mpc8548cds.dts to mpc8548cds_32b.dts and create mpc8548cds.dtsi Zhao Chenhui
2012-03-16 20:23   ` Kumar Gala
2012-03-06  9:06 ` [PATCH 9/9] powerpc/mpc8548cds: add 36-bit dts Zhao Chenhui
2012-03-16 20:23   ` Kumar Gala
2012-03-06 12:15 ` [PATCH 2/9] powerpc/mpc85xxcds: Fix PCI I/O space resource of PCI bridge Kumar Gala
2012-03-07  9:31   ` Zhao Chenhui-B35336
2012-03-07 10:45     ` Kumar Gala

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