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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a2f7c354 | 2 | /* |
a2f7c354 JK |
3 | * This is a good place to put board specific reboot fixups. |
4 | * | |
5 | * List of supported fixups: | |
6 | * geode-gx1/cs5530a - Jaya Kumar <jayalk@intworks.biz> | |
95069f89 | 7 | * geode-gx/lx/cs5536 - Andres Salomon <dilinger@debian.org> |
a2f7c354 JK |
8 | * |
9 | */ | |
10 | ||
11 | #include <asm/delay.h> | |
12 | #include <linux/pci.h> | |
3d034aec | 13 | #include <linux/interrupt.h> |
973efae2 | 14 | #include <asm/reboot_fixups.h> |
95069f89 | 15 | #include <asm/msr.h> |
2e8c1243 | 16 | #include <linux/cs5535.h> |
a2f7c354 JK |
17 | |
18 | static void cs5530a_warm_reset(struct pci_dev *dev) | |
19 | { | |
20 | /* writing 1 to the reset control register, 0x44 causes the | |
21 | cs5530a to perform a system warm reset */ | |
22 | pci_write_config_byte(dev, 0x44, 0x1); | |
23 | udelay(50); /* shouldn't get here but be safe and spin-a-while */ | |
24 | return; | |
25 | } | |
26 | ||
95069f89 AS |
27 | static void cs5536_warm_reset(struct pci_dev *dev) |
28 | { | |
0387f451 AS |
29 | /* writing 1 to the LSB of this MSR causes a hard reset */ |
30 | wrmsrl(MSR_DIVIL_SOFT_RESET, 1ULL); | |
95069f89 AS |
31 | udelay(50); /* shouldn't get here but be safe and spin a while */ |
32 | } | |
33 | ||
ff472a11 FF |
34 | static void rdc321x_reset(struct pci_dev *dev) |
35 | { | |
36 | unsigned i; | |
37 | /* Voluntary reset the watchdog timer */ | |
38 | outl(0x80003840, 0xCF8); | |
39 | /* Generate a CPU reset on next tick */ | |
40 | i = inl(0xCFC); | |
41 | /* Use the minimum timer resolution */ | |
42 | i |= 0x1600; | |
43 | outl(i, 0xCFC); | |
44 | outb(1, 0x92); | |
45 | } | |
46 | ||
37bc9f50 DB |
47 | static void ce4100_reset(struct pci_dev *dev) |
48 | { | |
49 | int i; | |
50 | ||
51 | for (i = 0; i < 10; i++) { | |
52 | outb(0x2, 0xcf9); | |
53 | udelay(50); | |
54 | } | |
55 | } | |
56 | ||
a2f7c354 JK |
57 | struct device_fixup { |
58 | unsigned int vendor; | |
59 | unsigned int device; | |
60 | void (*reboot_fixup)(struct pci_dev *); | |
61 | }; | |
62 | ||
37bc9f50 DB |
63 | /* |
64 | * PCI ids solely used for fixups_table go here | |
65 | */ | |
66 | #define PCI_DEVICE_ID_INTEL_CE4100 0x0708 | |
67 | ||
ebdd561a | 68 | static const struct device_fixup fixups_table[] = { |
a2f7c354 | 69 | { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset }, |
95069f89 | 70 | { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset }, |
6d1b30e3 | 71 | { PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE, cs5530a_warm_reset }, |
ff472a11 | 72 | { PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6030, rdc321x_reset }, |
37bc9f50 | 73 | { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CE4100, ce4100_reset }, |
a2f7c354 JK |
74 | }; |
75 | ||
76 | /* | |
77 | * we see if any fixup is available for our current hardware. if there | |
78 | * is a fixup, we call it and we expect to never return from it. if we | |
79 | * do return, we keep looking and then eventually fall back to the | |
80 | * standard mach_reboot on return. | |
81 | */ | |
82 | void mach_reboot_fixups(void) | |
83 | { | |
ebdd561a | 84 | const struct device_fixup *cur; |
a2f7c354 JK |
85 | struct pci_dev *dev; |
86 | int i; | |
87 | ||
3d034aec DL |
88 | /* we can be called from sysrq-B code. In such a case it is |
89 | * prohibited to dig PCI */ | |
90 | if (in_interrupt()) | |
91 | return; | |
92 | ||
38e548ee | 93 | for (i=0; i < ARRAY_SIZE(fixups_table); i++) { |
a2f7c354 | 94 | cur = &(fixups_table[i]); |
874ec33f | 95 | dev = pci_get_device(cur->vendor, cur->device, NULL); |
a2f7c354 JK |
96 | if (!dev) |
97 | continue; | |
98 | ||
99 | cur->reboot_fixup(dev); | |
57fea8f7 | 100 | pci_dev_put(dev); |
a2f7c354 | 101 | } |
a2f7c354 JK |
102 | } |
103 |