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 struct device_fixup {
47 	unsigned int vendor;
48 	unsigned int device;
49 	void (*reboot_fixup)(struct pci_dev *);
50 };
51 
52 static const struct device_fixup fixups_table[] = {
53 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset },
54 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset },
55 { PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE, cs5530a_warm_reset },
56 { PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6030, rdc321x_reset },
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 {
67 	const struct device_fixup *cur;
68 	struct pci_dev *dev;
69 	int i;
70 
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 
76 	for (i=0; i < ARRAY_SIZE(fixups_table); i++) {
77 		cur = &(fixups_table[i]);
78 		dev = pci_get_device(cur->vendor, cur->device, NULL);
79 		if (!dev)
80 			continue;
81 
82 		cur->reboot_fixup(dev);
83 		pci_dev_put(dev);
84 	}
85 }
86 
87