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-rw-r--r--arch/i386/Kconfig18
-rw-r--r--arch/i386/kernel/Makefile1
-rw-r--r--arch/i386/kernel/reboot.c2
-rw-r--r--arch/i386/kernel/reboot_fixups.c56
-rw-r--r--include/linux/reboot_fixups.h10
5 files changed, 87 insertions, 0 deletions
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 17a0cbce6f30..99b4f294a52d 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -653,6 +653,24 @@ config I8K
653 Say Y if you intend to run this kernel on a Dell Inspiron 8000. 653 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
654 Say N otherwise. 654 Say N otherwise.
655 655
656config X86_REBOOTFIXUPS
657 bool "Enable X86 board specific fixups for reboot"
658 depends on X86
659 default n
660 ---help---
661 This enables chipset and/or board specific fixups to be done
662 in order to get reboot to work correctly. This is only needed on
663 some combinations of hardware and BIOS. The symptom, for which
664 this config is intended, is when reboot ends with a stalled/hung
665 system.
666
667 Currently, the only fixup is for the Geode GX1/CS5530A/TROM2.1.
668 combination.
669
670 Say Y if you want to enable the fixup. Currently, it's safe to
671 enable this option even if you don't need it.
672 Say N otherwise.
673
656config MICROCODE 674config MICROCODE
657 tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support" 675 tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
658 ---help--- 676 ---help---
diff --git a/arch/i386/kernel/Makefile b/arch/i386/kernel/Makefile
index aacdae6f372d..0fbcfe00dd8d 100644
--- a/arch/i386/kernel/Makefile
+++ b/arch/i386/kernel/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_X86_TRAMPOLINE) += trampoline.o
23obj-$(CONFIG_X86_MPPARSE) += mpparse.o 23obj-$(CONFIG_X86_MPPARSE) += mpparse.o
24obj-$(CONFIG_X86_LOCAL_APIC) += apic.o nmi.o 24obj-$(CONFIG_X86_LOCAL_APIC) += apic.o nmi.o
25obj-$(CONFIG_X86_IO_APIC) += io_apic.o 25obj-$(CONFIG_X86_IO_APIC) += io_apic.o
26obj-$(CONFIG_X86_REBOOTFIXUPS) += reboot_fixups.o
26obj-$(CONFIG_X86_NUMAQ) += numaq.o 27obj-$(CONFIG_X86_NUMAQ) += numaq.o
27obj-$(CONFIG_X86_SUMMIT_NUMA) += summit.o 28obj-$(CONFIG_X86_SUMMIT_NUMA) += summit.o
28obj-$(CONFIG_KPROBES) += kprobes.o 29obj-$(CONFIG_KPROBES) += kprobes.o
diff --git a/arch/i386/kernel/reboot.c b/arch/i386/kernel/reboot.c
index 3d7e994563df..6dc27eb70ee7 100644
--- a/arch/i386/kernel/reboot.c
+++ b/arch/i386/kernel/reboot.c
@@ -13,6 +13,7 @@
13#include <asm/uaccess.h> 13#include <asm/uaccess.h>
14#include <asm/apic.h> 14#include <asm/apic.h>
15#include "mach_reboot.h" 15#include "mach_reboot.h"
16#include <linux/reboot_fixups.h>
16 17
17/* 18/*
18 * Power off function, if any 19 * Power off function, if any
@@ -348,6 +349,7 @@ void machine_restart(char * __unused)
348 /* rebooting needs to touch the page at absolute addr 0 */ 349 /* rebooting needs to touch the page at absolute addr 0 */
349 *((unsigned short *)__va(0x472)) = reboot_mode; 350 *((unsigned short *)__va(0x472)) = reboot_mode;
350 for (;;) { 351 for (;;) {
352 mach_reboot_fixups(); /* for board specific fixups */
351 mach_reboot(); 353 mach_reboot();
352 /* That didn't work - force a triple fault.. */ 354 /* That didn't work - force a triple fault.. */
353 __asm__ __volatile__("lidt %0": :"m" (no_idt)); 355 __asm__ __volatile__("lidt %0": :"m" (no_idt));
diff --git a/arch/i386/kernel/reboot_fixups.c b/arch/i386/kernel/reboot_fixups.c
new file mode 100644
index 000000000000..1b183b378c2c
--- /dev/null
+++ b/arch/i386/kernel/reboot_fixups.c
@@ -0,0 +1,56 @@
1/*
2 * linux/arch/i386/kernel/reboot_fixups.c
3 *
4 * This is a good place to put board specific reboot fixups.
5 *
6 * List of supported fixups:
7 * geode-gx1/cs5530a - Jaya Kumar <jayalk@intworks.biz>
8 *
9 */
10
11#include <asm/delay.h>
12#include <linux/pci.h>
13
14static void cs5530a_warm_reset(struct pci_dev *dev)
15{
16 /* writing 1 to the reset control register, 0x44 causes the
17 cs5530a to perform a system warm reset */
18 pci_write_config_byte(dev, 0x44, 0x1);
19 udelay(50); /* shouldn't get here but be safe and spin-a-while */
20 return;
21}
22
23struct device_fixup {
24 unsigned int vendor;
25 unsigned int device;
26 void (*reboot_fixup)(struct pci_dev *);
27};
28
29static struct device_fixup fixups_table[] = {
30{ PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset },
31};
32
33/*
34 * we see if any fixup is available for our current hardware. if there
35 * is a fixup, we call it and we expect to never return from it. if we
36 * do return, we keep looking and then eventually fall back to the
37 * standard mach_reboot on return.
38 */
39void mach_reboot_fixups(void)
40{
41 struct device_fixup *cur;
42 struct pci_dev *dev;
43 int i;
44
45 for (i=0; i < (sizeof(fixups_table)/sizeof(fixups_table[0])); i++) {
46 cur = &(fixups_table[i]);
47 dev = pci_get_device(cur->vendor, cur->device, 0);
48 if (!dev)
49 continue;
50
51 cur->reboot_fixup(dev);
52 }
53
54 printk(KERN_WARNING "No reboot fixup found for your hardware\n");
55}
56
diff --git a/include/linux/reboot_fixups.h b/include/linux/reboot_fixups.h
new file mode 100644
index 000000000000..480ea2d489d8
--- /dev/null
+++ b/include/linux/reboot_fixups.h
@@ -0,0 +1,10 @@
1#ifndef _LINUX_REBOOT_FIXUPS_H
2#define _LINUX_REBOOT_FIXUPS_H
3
4#ifdef CONFIG_X86_REBOOTFIXUPS
5extern void mach_reboot_fixups(void);
6#else
7#define mach_reboot_fixups() ((void)(0))
8#endif
9
10#endif /* _LINUX_REBOOT_FIXUPS_H */