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
cs5530a_warm_reset(struct pci_dev * dev)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
cs5536_warm_reset(struct pci_dev * dev)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
rdc321x_reset(struct pci_dev * dev)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
ce4100_reset(struct pci_dev * dev)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 */
mach_reboot_fixups(void)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