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authorRob Herring <robh@kernel.org>2015-01-10 05:34:39 +0300
committerBjorn Helgaas <bhelgaas@google.com>2015-01-22 22:59:45 +0300
commit1f94a94f67e1083e19fb7b436dd7ca7a4ba03f2b (patch)
treeab2370828b760ed28ca7500c37318c78fcfc6fef /drivers/pci/access.c
parent453c02c28405978b7ef5d673023e5fec19bccf3f (diff)
downloadlinux-1f94a94f67e1083e19fb7b436dd7ca7a4ba03f2b.tar.xz
PCI: Add generic config accessors
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>
Diffstat (limited to 'drivers/pci/access.c')
-rw-r--r--drivers/pci/access.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 49dd766852ba..d9b64a175990 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -67,6 +67,93 @@ EXPORT_SYMBOL(pci_bus_write_config_byte);
EXPORT_SYMBOL(pci_bus_write_config_word);
EXPORT_SYMBOL(pci_bus_write_config_dword);
+int pci_generic_config_read(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 *val)
+{
+ void __iomem *addr;
+
+ addr = bus->ops->map_bus(bus, devfn, where);
+ if (!addr) {
+ *val = ~0;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+
+ if (size == 1)
+ *val = readb(addr);
+ else if (size == 2)
+ *val = readw(addr);
+ else
+ *val = readl(addr);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+EXPORT_SYMBOL_GPL(pci_generic_config_read);
+
+int pci_generic_config_write(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 val)
+{
+ void __iomem *addr;
+
+ addr = bus->ops->map_bus(bus, devfn, where);
+ if (!addr)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ if (size == 1)
+ writeb(val, addr);
+ else if (size == 2)
+ writew(val, addr);
+ else
+ writel(val, addr);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+EXPORT_SYMBOL_GPL(pci_generic_config_write);
+
+int pci_generic_config_read32(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 *val)
+{
+ void __iomem *addr;
+
+ addr = bus->ops->map_bus(bus, devfn, where & ~0x3);
+ if (!addr) {
+ *val = ~0;
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ }
+
+ *val = readl(addr);
+
+ if (size <= 2)
+ *val = (*val >> (8 * (where & 3))) & ((1 << (size * 8)) - 1);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+EXPORT_SYMBOL_GPL(pci_generic_config_read32);
+
+int pci_generic_config_write32(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 val)
+{
+ void __iomem *addr;
+ u32 mask, tmp;
+
+ addr = bus->ops->map_bus(bus, devfn, where & ~0x3);
+ if (!addr)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ if (size == 4) {
+ writel(val, addr);
+ return PCIBIOS_SUCCESSFUL;
+ } else {
+ mask = ~(((1 << (size * 8)) - 1) << ((where & 0x3) * 8));
+ }
+
+ tmp = readl(addr) & mask;
+ tmp |= val << ((where & 0x3) * 8);
+ writel(tmp, addr);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+EXPORT_SYMBOL_GPL(pci_generic_config_write32);
+
/**
* pci_bus_set_ops - Set raw operations of pci bus
* @bus: pci bus struct