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 <linux/cs5535.h>
16
17static 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
26static 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
33static 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
46static void ce4100_reset(struct pci_dev *dev)
47{
48	int i;
49
50	for (i = 0; i < 10; i++) {
51		outb(0x2, 0xcf9);
52		udelay(50);
53	}
54}
55
56struct device_fixup {
57	unsigned int vendor;
58	unsigned int device;
59	void (*reboot_fixup)(struct pci_dev *);
60};
61
62/*
63 * PCI ids solely used for fixups_table go here
64 */
65#define PCI_DEVICE_ID_INTEL_CE4100	0x0708
66
67static const struct device_fixup fixups_table[] = {
68{ PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset },
69{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset },
70{ PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE, cs5530a_warm_reset },
71{ PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6030, rdc321x_reset },
72{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CE4100, ce4100_reset },
73};
74
75/*
76 * we see if any fixup is available for our current hardware. if there
77 * is a fixup, we call it and we expect to never return from it. if we
78 * do return, we keep looking and then eventually fall back to the
79 * standard mach_reboot on return.
80 */
81void mach_reboot_fixups(void)
82{
83	const struct device_fixup *cur;
84	struct pci_dev *dev;
85	int i;
86
87	/* we can be called from sysrq-B code. In such a case it is
88	 * prohibited to dig PCI */
89	if (in_interrupt())
90		return;
91
92	for (i=0; i < ARRAY_SIZE(fixups_table); i++) {
93		cur = &(fixups_table[i]);
94		dev = pci_get_device(cur->vendor, cur->device, NULL);
95		if (!dev)
96			continue;
97
98		cur->reboot_fixup(dev);
99		pci_dev_put(dev);
100	}
101}
102
103