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[PATCH] x86 reboot: Add reboot fixup for gx1/cs5530a

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This patch by Jaya Kumar introduces a generic infrastructure to deal with
x86 chipsets with nonstandard reset sequences, and adds support for the
Geode gx1/cs5530a chipset.

Signed-off-by: Jaya Kumar <jayalk@intworks.biz>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jaya Kumar
2005-05-01 08:58:49 -07:00
committed by Linus Torvalds
parent 67701ae976
commit a2f7c35415
5 changed files with 87 additions and 0 deletions
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56
arch/i386/kernel/reboot_fixups.c Normal file
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/*
* linux/arch/i386/kernel/reboot_fixups.c
*
* This is a good place to put board specific reboot fixups.
*
* List of supported fixups:
* geode-gx1/cs5530a - Jaya Kumar <jayalk@intworks.biz>
*
*/
#include <asm/delay.h>
#include <linux/pci.h>
static void cs5530a_warm_reset(struct pci_dev *dev)
{
/* writing 1 to the reset control register, 0x44 causes the
cs5530a to perform a system warm reset */
pci_write_config_byte(dev, 0x44, 0x1);
udelay(50); /* shouldn't get here but be safe and spin-a-while */
return;
}
struct device_fixup {
unsigned int vendor;
unsigned int device;
void (*reboot_fixup)(struct pci_dev *);
};
static struct device_fixup fixups_table[] = {
{ PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset },
};
/*
* we see if any fixup is available for our current hardware. if there
* is a fixup, we call it and we expect to never return from it. if we
* do return, we keep looking and then eventually fall back to the
* standard mach_reboot on return.
*/
void mach_reboot_fixups(void)
{
struct device_fixup *cur;
struct pci_dev *dev;
int i;
for (i=0; i < (sizeof(fixups_table)/sizeof(fixups_table[0])); i++) {
cur = &(fixups_table[i]);
dev = pci_get_device(cur->vendor, cur->device, 0);
if (!dev)
continue;
cur->reboot_fixup(dev);
}
printk(KERN_WARNING "No reboot fixup found for your hardware\n");
}