diff options
Diffstat (limited to 'arch/powerpc/include/asm/io.h')
| -rw-r--r-- | arch/powerpc/include/asm/io.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h index 6cc61a3c43ee..5a64757dc0d1 100644 --- a/arch/powerpc/include/asm/io.h +++ b/arch/powerpc/include/asm/io.h @@ -69,6 +69,14 @@ extern unsigned long pci_dram_offset; extern resource_size_t isa_mem_base; +/* Boolean set by platform if PIO accesses are suppored while _IO_BASE + * is not set or addresses cannot be translated to MMIO. This is typically + * set when the platform supports "special" PIO accesses via a non memory + * mapped mechanism, and allows things like the early udbg UART code to + * function. + */ +extern bool isa_io_special; + #ifdef CONFIG_PPC32 #if defined(CONFIG_PPC_INDIRECT_PIO) || defined(CONFIG_PPC_INDIRECT_MMIO) #error CONFIG_PPC_INDIRECT_{PIO,MMIO} are not yet supported on 32 bits |