diff options
| -rw-r--r-- | arch/powerpc/include/asm/io.h | 8 | ||||
| -rw-r--r-- | drivers/char/mem.c | 11 | ||||
| -rw-r--r-- | include/linux/io.h | 9 |
3 files changed, 27 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h index a3855b81ead..f94ef4213e9 100644 --- a/arch/powerpc/include/asm/io.h +++ b/arch/powerpc/include/asm/io.h @@ -20,6 +20,14 @@ extern int check_legacy_ioport(unsigned long base_port); #define _PNPWRP 0xa79 #define PNPBIOS_BASE 0xf000 +#if defined(CONFIG_PPC64) && defined(CONFIG_PCI) +extern struct pci_dev *isa_bridge_pcidev; +/* + * has legacy ISA devices ? + */ +#define arch_has_dev_port() (isa_bridge_pcidev != NULL) +#endif + #include <linux/device.h> #include <linux/io.h> diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 67c3371723c..e5eedfa24c9 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -27,14 +27,16 @@ #include <linux/splice.h> #include <linux/pfn.h> #include <linux/export.h> +#include <linux/io.h> #include <asm/uaccess.h> -#include <asm/io.h> #ifdef CONFIG_IA64 # include <linux/efi.h> #endif +#define DEVPORT_MINOR 4 + static inline unsigned long size_inside_page(unsigned long start, unsigned long size) { @@ -894,6 +896,13 @@ static int __init chr_dev_init(void) for (minor = 1; minor < ARRAY_SIZE(devlist); minor++) { if (!devlist[minor].name) continue; + + /* + * Create /dev/port? + */ + if ((minor == DEVPORT_MINOR) && !arch_has_dev_port()) + continue; + device_create(mem_class, NULL, MKDEV(MEM_MAJOR, minor), NULL, devlist[minor].name); } diff --git a/include/linux/io.h b/include/linux/io.h index 7fd2d2138bf..069e4075f87 100644 --- a/include/linux/io.h +++ b/include/linux/io.h @@ -67,4 +67,13 @@ int check_signature(const volatile void __iomem *io_addr, const unsigned char *signature, int length); void devm_ioremap_release(struct device *dev, void *res); +/* + * Some systems do not have legacy ISA devices. + * /dev/port is not a valid interface on these systems. + * So for those archs, <asm/io.h> should define the following symbol. + */ +#ifndef arch_has_dev_port +#define arch_has_dev_port() (1) +#endif + #endif /* _LINUX_IO_H */ |