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| author |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-07-15 13:03:11 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-08-14 14:58:08 +1000 |
| commit | 3fafe9c202321a3edc47386d2071af89555c9f45 (patch) | |
| tree | 7a809f8ab83049c69468e4c0a64f1ef977934d6a /arch/powerpc/include/asm/io.h | |
| parent | powerpc/powernv: Add helper to get ibm,chip-id of a node (diff) | |
| download | linux-dev-3fafe9c202321a3edc47386d2071af89555c9f45.tar.xz linux-dev-3fafe9c202321a3edc47386d2071af89555c9f45.zip | |
powerpc/powernv: Add PIO accessors for Power8 LPC bus
This uses the hooks provided by CONFIG_PPC_INDIRECT_PIO to
implement a set of hooks for IO port access to use the LPC
bus via OPAL calls for the first 64K of IO space
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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 |