2 * linux/arch/i386/kernel/reboot_fixups.c
4 * This is a good place to put board specific reboot fixups.
6 * List of supported fixups:
7 * geode-gx1/cs5530a - Jaya Kumar <jayalk@intworks.biz>
8 * geode-gx/lx/cs5536 - Andres Salomon <dilinger@debian.org>
12 #include <asm/delay.h>
13 #include <linux/pci.h>
14 #include <asm/reboot_fixups.h>
17 static void cs5530a_warm_reset(struct pci_dev *dev)
19 /* writing 1 to the reset control register, 0x44 causes the
20 cs5530a to perform a system warm reset */
21 pci_write_config_byte(dev, 0x44, 0x1);
22 udelay(50); /* shouldn't get here but be safe and spin-a-while */
26 static void cs5536_warm_reset(struct pci_dev *dev)
29 * 6.6.2.12 Soft Reset (DIVIL_SOFT_RESET)
30 * writing 1 to the LSB of this MSR causes a hard reset.
32 wrmsrl(0x51400017, 1ULL);
33 udelay(50); /* shouldn't get here but be safe and spin a while */
39 void (*reboot_fixup)(struct pci_dev *);
42 static struct device_fixup fixups_table[] = {
43 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset },
44 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset },
48 * we see if any fixup is available for our current hardware. if there
49 * is a fixup, we call it and we expect to never return from it. if we
50 * do return, we keep looking and then eventually fall back to the
51 * standard mach_reboot on return.
53 void mach_reboot_fixups(void)
55 struct device_fixup *cur;
59 for (i=0; i < ARRAY_SIZE(fixups_table); i++) {
60 cur = &(fixups_table[i]);
61 dev = pci_get_device(cur->vendor, cur->device, NULL);
65 cur->reboot_fixup(dev);