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 
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 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 
46 static 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 
56 struct 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 
67 static 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  */
81 void 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