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) |
27 | { | |
0387f451 AS |
28 | /* writing 1 to the LSB of this MSR causes a hard reset */ |
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 | ||
a2f7c354 JK |
33 | struct device_fixup { |
34 | unsigned int vendor; | |
35 | unsigned int device; | |
36 | void (*reboot_fixup)(struct pci_dev *); | |
37 | }; | |
38 | ||
39 | static struct device_fixup fixups_table[] = { | |
40 | { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset }, | |
95069f89 | 41 | { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset }, |
6d1b30e3 | 42 | { PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE, cs5530a_warm_reset }, |
a2f7c354 JK |
43 | }; |
44 | ||
45 | /* | |
46 | * we see if any fixup is available for our current hardware. if there | |
47 | * is a fixup, we call it and we expect to never return from it. if we | |
48 | * do return, we keep looking and then eventually fall back to the | |
49 | * standard mach_reboot on return. | |
50 | */ | |
51 | void mach_reboot_fixups(void) | |
52 | { | |
53 | struct device_fixup *cur; | |
54 | struct pci_dev *dev; | |
55 | int i; | |
56 | ||
3d034aec DL |
57 | /* we can be called from sysrq-B code. In such a case it is |
58 | * prohibited to dig PCI */ | |
59 | if (in_interrupt()) | |
60 | return; | |
61 | ||
38e548ee | 62 | for (i=0; i < ARRAY_SIZE(fixups_table); i++) { |
a2f7c354 | 63 | cur = &(fixups_table[i]); |
874ec33f | 64 | dev = pci_get_device(cur->vendor, cur->device, NULL); |
a2f7c354 JK |
65 | if (!dev) |
66 | continue; | |
67 | ||
68 | cur->reboot_fixup(dev); | |
69 | } | |
a2f7c354 JK |
70 | } |
71 |