[mirror_ubuntu-artful-kernel.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 */
}

static void rdc321x_reset(struct pci_dev *dev)
{
	unsigned i;
	/* Voluntary reset the watchdog timer */
	outl(0x80003840, 0xCF8);
	/* Generate a CPU reset on next tick */
	i = inl(0xCFC);
	/* Use the minimum timer resolution */
	i |= 0x1600;
	outl(i, 0xCFC);
	outb(1, 0x92);
}

struct device_fixup {
	unsigned int vendor;
	unsigned int device;
	void (*reboot_fixup)(struct pci_dev *);
};

static const 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 },
{ PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6030, rdc321x_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)
{
	const 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
a2f7c354	1	/*
a2f7c354 JK	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>
95069f89	6	* geode-gx/lx/cs5536 - Andres Salomon <dilinger@debian.org>
a2f7c354 JK	7	*
	8	*/
	9
	10	#include <asm/delay.h>
	11	#include <linux/pci.h>
3d034aec	12	#include <linux/interrupt.h>
973efae2	13	#include <asm/reboot_fixups.h>
95069f89	14	#include <asm/msr.h>
0387f451	15	#include <asm/geode.h>
a2f7c354 JK	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
95069f89 AS	26	static void cs5536_warm_reset(struct pci_dev *dev)
95069f89 AS	27	{
0387f451 AS	28	/* writing 1 to the LSB of this MSR causes a hard reset */
0387f451 AS	29	wrmsrl(MSR_DIVIL_SOFT_RESET, 1ULL);
95069f89 AS	30	udelay(50); /* shouldn't get here but be safe and spin a while */
	31	}
	32
ff472a11 FF	33	static void rdc321x_reset(struct pci_dev *dev)
	34	{
	35	unsigned i;
	36	/* Voluntary reset the watchdog timer */
	37	outl(0x80003840, 0xCF8);
	38	/* Generate a CPU reset on next tick */
	39	i = inl(0xCFC);
	40	/* Use the minimum timer resolution */
	41	i \|= 0x1600;
	42	outl(i, 0xCFC);
	43	outb(1, 0x92);
	44	}
	45
a2f7c354 JK	46	struct device_fixup {
	47	unsigned int vendor;
	48	unsigned int device;
	49	void (reboot_fixup)(struct pci_dev );
	50	};
	51
ebdd561a	52	static const struct device_fixup fixups_table[] = {
a2f7c354	53	{ PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset },
95069f89	54	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset },
6d1b30e3	55	{ PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE, cs5530a_warm_reset },
ff472a11	56	{ PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6030, rdc321x_reset },
a2f7c354 JK	57	};
	58
	59	/*
	60	* we see if any fixup is available for our current hardware. if there
	61	* is a fixup, we call it and we expect to never return from it. if we
	62	* do return, we keep looking and then eventually fall back to the
	63	* standard mach_reboot on return.
	64	*/
	65	void mach_reboot_fixups(void)
	66	{
ebdd561a	67	const struct device_fixup *cur;
a2f7c354 JK	68	struct pci_dev *dev;
	69	int i;
	70
3d034aec DL	71	/* we can be called from sysrq-B code. In such a case it is
	72	* prohibited to dig PCI */
	73	if (in_interrupt())
	74	return;
	75
38e548ee	76	for (i=0; i < ARRAY_SIZE(fixups_table); i++) {
a2f7c354	77	cur = &(fixups_table[i]);
874ec33f	78	dev = pci_get_device(cur->vendor, cur->device, NULL);
a2f7c354 JK	79	if (!dev)
	80	continue;
	81
	82	cur->reboot_fixup(dev);
	83	}
a2f7c354 JK	84	}
a2f7c354 JK	85