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Commit 87dd9a4d authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle
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MIPS: PCI: Support generic drivers 



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: default avatarPaul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14346/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent c5611df9

arch/mips/Kconfig

+1 −0
Original line number Original line Diff line number Diff line
@@ -2998,6 +2998,7 @@ config PCI_DOMAINS_GENERIC 
	bool

	bool





config PCI_DRIVERS_GENERIC

config PCI_DRIVERS_GENERIC

	select PCI_DOMAINS_GENERIC if PCI_DOMAINS

	bool

	bool





config PCI_DRIVERS_LEGACY

config PCI_DRIVERS_LEGACY

arch/mips/pci/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -4,6 +4,7 @@ 




obj-y				+= pci.o

obj-y				+= pci.o

obj-$(CONFIG_PCI_DRIVERS_LEGACY)+= pci-legacy.o

obj-$(CONFIG_PCI_DRIVERS_LEGACY)+= pci-legacy.o

obj-$(CONFIG_PCI_DRIVERS_GENERIC)+= pci-generic.o





#

#

# PCI bus host bridge specific code

# PCI bus host bridge specific code

arch/mips/pci/pci-generic.c

0 → 100644
+52 −0
Original line number Original line Diff line number Diff line 
/*

 * 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);

}