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csky: Add PCI support

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Add the pci related code for csky arch to support basic pci virtual
function, such as qemu virt-pci-9pfs.

Signed-off-by: MaJun <majun258@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
This commit is contained in:
MaJun 2020-01-27 10:56:21 +08:00 committed by Guo Ren
parent dc2efc0028
commit 5b49c82dad
3 changed files with 39 additions and 1 deletions
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5
arch/csky/Kconfig
View File

@ -58,6 +58,11 @@ config CSKY
select TIMER_OF
select USB_ARCH_HAS_EHCI
select USB_ARCH_HAS_OHCI
select GENERIC_PCI_IOMAP
select HAVE_PCI
select PCI_DOMAINS_GENERIC if PCI
select PCI_SYSCALL if PCI
select PCI_MSI if PCI
config CPU_HAS_CACHEV2
bool

1
arch/csky/include/asm/Kbuild
View File

@ -28,7 +28,6 @@ generic-y += local64.h
generic-y += mm-arch-hooks.h
generic-y += mmiowb.h
generic-y += module.h
generic-y += pci.h
generic-y += percpu.h
generic-y += preempt.h
generic-y += qrwlock.h

34
arch/csky/include/asm/pci.h Normal file
View File

@ -0,0 +1,34 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __ASM_CSKY_PCI_H
#define __ASM_CSKY_PCI_H
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <asm/io.h>
#define PCIBIOS_MIN_IO 0
#define PCIBIOS_MIN_MEM 0
/* C-SKY shim does not initialize PCI bus */
#define pcibios_assign_all_busses() 1
extern int isa_dma_bridge_buggy;
#ifdef CONFIG_PCI
static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
{
/* no legacy IRQ on csky */
return -ENODEV;
}
static inline int pci_proc_domain(struct pci_bus *bus)
{
/* always show the domain in /proc */
return 1;
}
#endif /* CONFIG_PCI */
#endif /* __ASM_CSKY_PCI_H */