diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig | 3 | ||||
| -rw-r--r-- | lib/Makefile | 3 | ||||
| -rw-r--r-- | lib/iomap.c | 15 |
3 files changed, 19 insertions, 2 deletions
diff --git a/lib/Kconfig b/lib/Kconfig index e5c2c514174a..ba3d104994d9 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -138,4 +138,7 @@ config HAS_DMA depends on !NO_DMA default y +config CHECK_SIGNATURE + bool + endmenu diff --git a/lib/Makefile b/lib/Makefile index d9e5f1cd0bfb..6b0ba8cf4e5f 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -21,7 +21,8 @@ CFLAGS_kobject_uevent.o += -DDEBUG endif obj-$(CONFIG_GENERIC_IOMAP) += iomap.o -obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o check_signature.o +obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o +obj-$(CONFIG_CHECK_SIGNATURE) += check_signature.o obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o lib-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o diff --git a/lib/iomap.c b/lib/iomap.c index a57d262a5ed9..864f2ec1966e 100644 --- a/lib/iomap.c +++ b/lib/iomap.c @@ -240,7 +240,20 @@ void ioport_unmap(void __iomem *addr) EXPORT_SYMBOL(ioport_map); EXPORT_SYMBOL(ioport_unmap); -/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */ +/** + * pci_iomap - create a virtual mapping cookie for a PCI BAR + * @dev: PCI device that owns the BAR + * @bar: BAR number + * @maxlen: length of the memory to map + * + * Using this function you will get a __iomem address to your device BAR. + * You can access it using ioread*() and iowrite*(). These functions hide + * the details if this is a MMIO or PIO address space and will just do what + * you expect from them in the correct way. + * + * @maxlen specifies the maximum length to map. If you want to get access to + * the complete BAR without checking for its length first, pass %0 here. + * */ void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) { unsigned long start = pci_resource_start(dev, bar); |