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MIPS: PCI: Support generic drivers

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Introduce support for PCI drivers using only functionality provided
generically by the PCI subsystem, by adding the minimum arch-provided
functions required.

The driver this has been developed for & tested with the xilinx-pcie on
a MIPS Boston development board.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14346/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton 2016-10-05 18:18:13 +01:00 committed by Ralf Baechle
parent c5611df968
commit 87dd9a4de4
3 changed files with 54 additions and 0 deletions
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1
arch/mips/Kconfig
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@ -2998,6 +2998,7 @@ config PCI_DOMAINS_GENERIC
bool
config PCI_DRIVERS_GENERIC
select PCI_DOMAINS_GENERIC if PCI_DOMAINS
bool
config PCI_DRIVERS_LEGACY

1
arch/mips/pci/Makefile
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@ -4,6 +4,7 @@
obj-y += pci.o
obj-$(CONFIG_PCI_DRIVERS_LEGACY)+= pci-legacy.o
obj-$(CONFIG_PCI_DRIVERS_GENERIC)+= pci-generic.o
#
# PCI bus host bridge specific code

52
arch/mips/pci/pci-generic.c Normal file
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@ -0,0 +1,52 @@
/*
* Copyright (C) 2016 Imagination Technologies
* Author: Paul Burton <paul.burton@imgtec.com>
*
* pcibios_align_resource taken from arch/arm/kernel/bios32.c.
*
* 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
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/pci.h>
/*
* We need to avoid collisions with `mirrored' VGA ports
* and other strange ISA hardware, so we always want the
* addresses to be allocated in the 0x000-0x0ff region
* modulo 0x400.
*
* Why? Because some silly external IO cards only decode
* the low 10 bits of the IO address. The 0x00-0xff region
* is reserved for motherboard devices that decode all 16
* bits, so it's ok to allocate at, say, 0x2800-0x28ff,
* but we want to try to avoid allocating at 0x2900-0x2bff
* which might have be mirrored at 0x0100-0x03ff..
*/
resource_size_t pcibios_align_resource(void *data, const struct resource *res,
resource_size_t size, resource_size_t align)
{
struct pci_dev *dev = data;
resource_size_t start = res->start;
struct pci_host_bridge *host_bridge;
if (res->flags & IORESOURCE_IO && start & 0x300)
start = (start + 0x3ff) & ~0x3ff;
start = (start + align - 1) & ~(align - 1);
host_bridge = pci_find_host_bridge(dev->bus);
if (host_bridge->align_resource)
return host_bridge->align_resource(dev, res,
start, size, align);
return start;
}
void pcibios_fixup_bus(struct pci_bus *bus)
{
pci_read_bridge_bases(bus);
}