Paul Burton 305723ab43 MIPS: Malta: Fix IOCU disable switch read for MIPS64 ... Malta boards used with CPU emulators feature a switch to disable use of an IOCU. Software has to check this switch & ignore any present IOCU if the switch is closed. The read used to do this was unsafe for 64 bit kernels, as it simply casted the address 0xbf403000 to a pointer & dereferenced it. Whilst in a 32 bit kernel this would access kseg1, in a 64 bit kernel this attempts to access xuseg & results in an address error exception. Fix by accessing a correctly formed ckseg1 address generated using the CKSEG1ADDR macro. Whilst modifying this code, define the name of the register and the bit we care about within it, which indicates whether PCI DMA is routed to the IOCU or straight to DRAM. The code previously checked that bit 0 was also set, but the least significant 7 bits of the CONFIG_GEN0 register contain the value of the MReqInfo signal provided to the IOCU OCP bus, so singling out bit 0 makes little sense & that part of the check is dropped. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Fixes: b6d92b4a6b ("MIPS: Add option to disable software I/O coherency.") Cc: Matt Redfearn <matt.redfearn@imgtec.com> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Kees Cook <keescook@chromium.org> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/14187/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>		2016-09-29 18:59:49 +02:00
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Makefile	MIPS: Malta: Setup RAM regions via DT	2015-11-11 08:35:47 +01:00
malta-amon.c
malta-display.c
malta-dt.c	MIPS: Malta: Basic DT plumbing	2015-06-21 21:54:29 +02:00
malta-dtshim.c	tree-wide: replace config_enabled() with IS_ENABLED()	2016-08-04 08:50:07 -04:00
malta-init.c	MIPS: Fix early CM probing	2016-02-09 17:18:31 +01:00
malta-int.c	MIPS: CM: Add support for reporting CM cache errors	2015-08-26 15:23:15 +02:00
malta-memory.c	tree-wide: replace config_enabled() with IS_ENABLED()	2016-08-04 08:50:07 -04:00
malta-platform.c
malta-pm.c
malta-reset.c
malta-setup.c	MIPS: Malta: Fix IOCU disable switch read for MIPS64	2016-09-29 18:59:49 +02:00
malta-time.c	MIPS: malta-time: Take seconds into account	2016-05-13 15:30:25 +02:00
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