[deliverable/linux.git] / arch / x86 / kernel / reboot_fixups_32.c

/*
 * This is a good place to put board specific reboot fixups.
 *
 * List of supported fixups:
 * geode-gx1/cs5530a - Jaya Kumar <jayalk@intworks.biz>
 * geode-gx/lx/cs5536 - Andres Salomon <dilinger@debian.org>
 *
 */

#include <asm/delay.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <asm/reboot_fixups.h>
#include <asm/msr.h>
#include <asm/geode.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;
}

static void cs5536_warm_reset(struct pci_dev *dev)
{
	/* writing 1 to the LSB of this MSR causes a hard reset */
	wrmsrl(MSR_DIVIL_SOFT_RESET, 1ULL);
	udelay(50); /* shouldn't get here but be safe and spin a while */
}

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 },
{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset },
{ PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE, 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;

	/* we can be called from sysrq-B code. In such a case it is
	 * prohibited to dig PCI */
	if (in_interrupt())
		return;

	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
	1	/*
	2	* This is a good place to put board specific reboot fixups.
	3	*
	4	* List of supported fixups:
	5	* geode-gx1/cs5530a - Jaya Kumar <jayalk@intworks.biz>
	6	* geode-gx/lx/cs5536 - Andres Salomon <dilinger@debian.org>
	7	*
	8	*/
	9
	10	#include <asm/delay.h>
	11	#include <linux/pci.h>
	12	#include <linux/interrupt.h>
	13	#include <asm/reboot_fixups.h>
	14	#include <asm/msr.h>
	15	#include <asm/geode.h>
	16
	17	static void cs5530a_warm_reset(struct pci_dev *dev)
	18	{
	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 */
	23	return;
	24	}
	25
	26	static void cs5536_warm_reset(struct pci_dev *dev)
	27	{
	28	/* writing 1 to the LSB of this MSR causes a hard reset */
	29	wrmsrl(MSR_DIVIL_SOFT_RESET, 1ULL);
	30	udelay(50); /* shouldn't get here but be safe and spin a while */
	31	}
	32
	33	struct device_fixup {
	34	unsigned int vendor;
	35	unsigned int device;
	36	void (reboot_fixup)(struct pci_dev );
	37	};
	38
	39	static struct device_fixup fixups_table[] = {
	40	{ PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset },
	41	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset },
	42	{ PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE, cs5530a_warm_reset },
	43	};
	44
	45	/*
	46	* we see if any fixup is available for our current hardware. if there
	47	* is a fixup, we call it and we expect to never return from it. if we
	48	* do return, we keep looking and then eventually fall back to the
	49	* standard mach_reboot on return.
	50	*/
	51	void mach_reboot_fixups(void)
	52	{
	53	struct device_fixup *cur;
	54	struct pci_dev *dev;
	55	int i;
	56
	57	/* we can be called from sysrq-B code. In such a case it is
	58	* prohibited to dig PCI */
	59	if (in_interrupt())
	60	return;
	61
	62	for (i=0; i < ARRAY_SIZE(fixups_table); i++) {
	63	cur = &(fixups_table[i]);
	64	dev = pci_get_device(cur->vendor, cur->device, NULL);
	65	if (!dev)
	66	continue;
	67
	68	cur->reboot_fixup(dev);
	69	}
	70	}
	71