xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

PCI: Add generic config accessors

Browse Source 
Many PCI controllers' configuration space accesses are memory-mapped and
vary only in address calculation and access checks.  There are 2 main
access methods: a decoded address space such as ECAM or a single address
and data register similar to x86.  This implementation can support both
cases as well as be used in cases that need additional pre- or post-access
handling.

Add a new pci_ops member, map_bus, which can do access checks and any
necessary setup.  It returns the address to use for the configuration space
access.  The access types supported are 32-bit only accesses or correct
byte, word, or dword sized accesses.

Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Rob Herring
2015-01-09 20:34:39 -06:00
committed by Bjorn Helgaas
parent 453c02c284
commit 1f94a94f67
2 changed files with 98 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
include/linux/pci.h
View File

@@ -560,6 +560,7 @@ static inline int pcibios_err_to_errno(int err)
/* Low-level architecture-dependent routines */
struct pci_ops {
void __iomem *(*map_bus)(struct pci_bus *bus, unsigned int devfn, int where);
int (*read)(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val);
int (*write)(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val);
};
@@ -857,6 +858,16 @@ int pci_bus_write_config_word(struct pci_bus *bus, unsigned int devfn,
int where, u16 val);
int pci_bus_write_config_dword(struct pci_bus *bus, unsigned int devfn,
int where, u32 val);
int pci_generic_config_read(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *val);
int pci_generic_config_write(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val);
int pci_generic_config_read32(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *val);
int pci_generic_config_write32(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val);
struct pci_ops *pci_bus_set_ops(struct pci_bus *bus, struct pci_ops *ops);
static inline int pci_read_config_byte(const struct pci_dev *dev, int where, u8 *val)