diff options
| author | Andres Salomon <dilinger@queued.net> | 2007-07-06 11:17:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-06 11:45:11 -0700 |
| commit | 95069f89e80bb49ecc1b135bf85747e8dc6681f9 (patch) | |
| tree | 33f11de09544bfd37d7bee25b7d3ace0bdac4412 | |
| parent | 1feb17e286339382a1ae36e0fecc4d88c2d7f123 (diff) | |
GEODE: reboot fixup for geode machines with CS5536 boards
Writing to MSR 0x51400017 forces a hard reset on CS5536-based machines,
this has the reboot fixup do just that if such a board is detected.
Acked-by: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Andres Salomon <dilinger@debian.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | arch/i386/Kconfig | 4 | ||||
| -rw-r--r-- | arch/i386/kernel/reboot_fixups.c | 13 |
2 files changed, 15 insertions, 2 deletions
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig index d2f6a247414..b1b2b30b1b8 100644 --- a/arch/i386/Kconfig +++ b/arch/i386/Kconfig @@ -441,8 +441,8 @@ config X86_REBOOTFIXUPS this config is intended, is when reboot ends with a stalled/hung system. - Currently, the only fixup is for the Geode GX1/CS5530A/TROM2.1. - combination. + Currently, the only fixup is for the Geode machines using + CS5530A and CS5536 chipsets. Say Y if you want to enable the fixup. Currently, it's safe to enable this option even if you don't need it. diff --git a/arch/i386/kernel/reboot_fixups.c b/arch/i386/kernel/reboot_fixups.c index 2d78d918340..03e1cce58f4 100644 --- a/arch/i386/kernel/reboot_fixups.c +++ b/arch/i386/kernel/reboot_fixups.c @@ -5,12 +5,14 @@ * * List of supported fixups: * geode-gx1/cs5530a - Jaya Kumar <jayalk@intworks.biz> + * geode-gx/lx/cs5536 - Andres Salomon <dilinger@debian.org> * */ #include <asm/delay.h> #include <linux/pci.h> #include <asm/reboot_fixups.h> +#include <asm/msr.h> static void cs5530a_warm_reset(struct pci_dev *dev) { @@ -21,6 +23,16 @@ static void cs5530a_warm_reset(struct pci_dev *dev) return; } +static void cs5536_warm_reset(struct pci_dev *dev) +{ + /* + * 6.6.2.12 Soft Reset (DIVIL_SOFT_RESET) + * writing 1 to the LSB of this MSR causes a hard reset. + */ + wrmsrl(0x51400017, 1ULL); + udelay(50); /* shouldn't get here but be safe and spin a while */ +} + struct device_fixup { unsigned int vendor; unsigned int device; @@ -29,6 +41,7 @@ struct device_fixup { static struct device_fixup fixups_table[] = { { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset }, +{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset }, }; /* |