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Commit 3fafe9c2 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt
Browse files

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: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent b37193b7

arch/powerpc/include/asm/io.h

+8 −0
Original line number Diff line number Diff line
@@ -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

arch/powerpc/include/asm/opal.h

+2 −0
Original line number Diff line number Diff line
@@ -687,6 +687,8 @@ extern int opal_machine_check(struct pt_regs *regs); 


extern void opal_shutdown(void);



extern void opal_lpc_init(void);



#endif /* __ASSEMBLY__ */



#endif /* __OPAL_H */

arch/powerpc/kernel/io.c

+3 −0
Original line number Diff line number Diff line
@@ -25,6 +25,9 @@ 
#include <asm/firmware.h>

#include <asm/bug.h>



/* See definition in io.h */

bool isa_io_special;



void _insb(const volatile u8 __iomem *port, void *buf, long count)

{

	u8 *tbuf = buf;

arch/powerpc/platforms/powernv/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ config PPC_POWERNV 
	select PPC_P7_NAP

	select PPC_PCI_CHOICE if EMBEDDED

	select EPAPR_BOOT

	select PPC_INDIRECT_PIO

	default y



config POWERNV_MSI

arch/powerpc/platforms/powernv/Makefile

+1 −1
Original line number Diff line number Diff line 
obj-y			+= setup.o opal-takeover.o opal-wrappers.o opal.o

obj-y			+= opal-rtc.o opal-nvram.o

obj-y			+= opal-rtc.o opal-nvram.o opal-lpc.o



obj-$(CONFIG_SMP)	+= smp.o

obj-$(CONFIG_PCI)	+= pci.o pci-p5ioc2.o pci-ioda.o