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authorLorenzo Pieralisi <lorenzo.pieralisi@arm.com>2017-04-19 17:48:53 +0100
committerBjorn Helgaas <bhelgaas@google.com>2017-04-24 13:53:13 -0500
commitb9cdbe6e39351f0ba6cc0c5bc218443f0898e123 (patch)
tree602b8008f855067f4b13f72ff6d50f6b02059dbe /arch/arm/include/asm/io.h
parentf1e209b7f80288a711268af9054a04d3f6900a6b (diff)
downloadlinux-b9cdbe6e39351f0ba6cc0c5bc218443f0898e123.tar.bz2
ARM: Implement pci_remap_cfgspace() interface
The PCI bus specification (rev 3.0, 3.2.5 "Transaction Ordering and Posting") defines rules for PCI configuration space transactions ordering and posting, that state that configuration writes have to be non-posted transactions. Current ioremap interface on ARM provides mapping functions that provide "bufferable" writes transactions (ie ioremap uses MT_DEVICE memory type) aka posted writes, so PCI host controller drivers have no arch interface to remap PCI configuration space with memory attributes that comply with the PCI specifications for configuration space. Implement an ARM specific pci_remap_cfgspace() interface that allows to map PCI config memory regions with MT_UNCACHED memory type (ie strongly ordered - non-posted writes), providing a remap function that complies with PCI specifications for config space transactions. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Russell King <linux@armlinux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/io.h')
-rw-r--r--arch/arm/include/asm/io.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index 42871fb8340e..2cfbc531f63b 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -187,6 +187,16 @@ static inline void pci_ioremap_set_mem_type(int mem_type) {}
extern int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr);
/*
+ * PCI configuration space mapping function.
+ *
+ * The PCI specification does not allow configuration write
+ * transactions to be posted. Add an arch specific
+ * pci_remap_cfgspace() definition that is implemented
+ * through strongly ordered memory mappings.
+ */
+#define pci_remap_cfgspace pci_remap_cfgspace
+void __iomem *pci_remap_cfgspace(resource_size_t res_cookie, size_t size);
+/*
* Now, pick up the machine-defined IO definitions
*/
#ifdef CONFIG_NEED_MACH_IO_H