[mirror_ubuntu-jammy-kernel.git] / arch / i386 / kernel / reboot_fixups.c

/*
 * 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>
#include <linux/reboot_fixups.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 < ARRAY_SIZE(fixups_table); i++) {
		cur = &(fixups_table[i]);
		dev = pci_get_device(cur->vendor, cur->device, NULL);
		if (!dev)
			continue;

		cur->reboot_fixup(dev);
	}
}
Commit	Line	Data
a2f7c354 JK	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>
5cc6135a	13	#include <linux/reboot_fixups.h>
a2f7c354 JK	14
	15	static void cs5530a_warm_reset(struct pci_dev *dev)
	16	{
	17	/* writing 1 to the reset control register, 0x44 causes the
	18	cs5530a to perform a system warm reset */
	19	pci_write_config_byte(dev, 0x44, 0x1);
	20	udelay(50); /* shouldn't get here but be safe and spin-a-while */
	21	return;
	22	}
	23
	24	struct device_fixup {
	25	unsigned int vendor;
	26	unsigned int device;
	27	void (reboot_fixup)(struct pci_dev );
	28	};
	29
	30	static struct device_fixup fixups_table[] = {
	31	{ PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset },
	32	};
	33
	34	/*
	35	* we see if any fixup is available for our current hardware. if there
	36	* is a fixup, we call it and we expect to never return from it. if we
	37	* do return, we keep looking and then eventually fall back to the
	38	* standard mach_reboot on return.
	39	*/
	40	void mach_reboot_fixups(void)
	41	{
	42	struct device_fixup *cur;
	43	struct pci_dev *dev;
	44	int i;
	45
38e548ee	46	for (i=0; i < ARRAY_SIZE(fixups_table); i++) {
a2f7c354	47	cur = &(fixups_table[i]);
874ec33f	48	dev = pci_get_device(cur->vendor, cur->device, NULL);
a2f7c354 JK	49	if (!dev)
	50	continue;
	51
	52	cur->reboot_fixup(dev);
	53	}
a2f7c354 JK	54	}
a2f7c354 JK	55