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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a2f7c35415
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>
57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
/*
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* linux/arch/i386/kernel/reboot_fixups.c
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*
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* This is a good place to put board specific reboot fixups.
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*
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* List of supported fixups:
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* geode-gx1/cs5530a - Jaya Kumar <jayalk@intworks.biz>
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*
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*/
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#include <asm/delay.h>
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#include <linux/pci.h>
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static void cs5530a_warm_reset(struct pci_dev *dev)
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{
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/* writing 1 to the reset control register, 0x44 causes the
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cs5530a to perform a system warm reset */
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pci_write_config_byte(dev, 0x44, 0x1);
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udelay(50); /* shouldn't get here but be safe and spin-a-while */
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return;
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}
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struct device_fixup {
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unsigned int vendor;
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unsigned int device;
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void (*reboot_fixup)(struct pci_dev *);
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};
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static struct device_fixup fixups_table[] = {
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{ PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset },
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};
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/*
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* we see if any fixup is available for our current hardware. if there
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* is a fixup, we call it and we expect to never return from it. if we
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* do return, we keep looking and then eventually fall back to the
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* standard mach_reboot on return.
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*/
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void mach_reboot_fixups(void)
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{
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struct device_fixup *cur;
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struct pci_dev *dev;
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int i;
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for (i=0; i < (sizeof(fixups_table)/sizeof(fixups_table[0])); i++) {
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cur = &(fixups_table[i]);
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dev = pci_get_device(cur->vendor, cur->device, 0);
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if (!dev)
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continue;
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cur->reboot_fixup(dev);
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}
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printk(KERN_WARNING "No reboot fixup found for your hardware\n");
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}
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