From: Guo Ren <guoren@linux.alibaba.com>
To: linux-csky@vger.kernel.org, majun258@linux.alibaba.com
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH] csky: Add PCI support
Date: Tue, 11 Feb 2020 11:41:07 +0800 [thread overview]
Message-ID: <20200211034107.11192-1-guoren@linux.alibaba.com> (raw)
From: MaJun <majun258@linux.alibaba.com>
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>
---
arch/csky/Kconfig | 5 +++++
arch/csky/include/asm/pci.h | 34 ++++++++++++++++++++++++++++++++++
2 files changed, 39 insertions(+)
create mode 100644 arch/csky/include/asm/pci.h
diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index bf246b036dee..72b2999a889a 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -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
diff --git a/arch/csky/include/asm/pci.h b/arch/csky/include/asm/pci.h
new file mode 100644
index 000000000000..ebc765b1f78b
--- /dev/null
+++ b/arch/csky/include/asm/pci.h
@@ -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 */
--
2.17.0
reply other threads:[~2020-02-11 3:41 UTC|newest]
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