1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * This is a good place to put board specific
4 *
5 * List of supported fixups:
6 * geode-gx1/cs5530a - Jaya Kumar <jayalk@intw
7 * geode-gx/lx/cs5536 - Andres Salomon <diling
8 *
9 */
10
11 #include <asm/delay.h>
12 #include <linux/pci.h>
13 #include <linux/interrupt.h>
14 #include <asm/reboot_fixups.h>
15 #include <asm/msr.h>
16 #include <linux/cs5535.h>
17
18 static void cs5530a_warm_reset(struct pci_dev
19 {
20 /* writing 1 to the reset control regi
21 cs5530a to perform a system warm reset
22 pci_write_config_byte(dev, 0x44, 0x1);
23 udelay(50); /* shouldn't get here but
24 return;
25 }
26
27 static void cs5536_warm_reset(struct pci_dev *
28 {
29 /* writing 1 to the LSB of this MSR ca
30 wrmsrl(MSR_DIVIL_SOFT_RESET, 1ULL);
31 udelay(50); /* shouldn't get here but
32 }
33
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
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
57 struct device_fixup {
58 unsigned int vendor;
59 unsigned int device;
60 void (*reboot_fixup)(struct pci_dev *)
61 };
62
63 /*
64 * PCI ids solely used for fixups_table go her
65 */
66 #define PCI_DEVICE_ID_INTEL_CE4100 0x0708
67
68 static const struct device_fixup fixups_table[
69 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_553
70 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_
71 { PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BR
72 { PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6030,
73 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CE4
74 };
75
76 /*
77 * we see if any fixup is available for our cu
78 * is a fixup, we call it and we expect to nev
79 * do return, we keep looking and then eventua
80 * standard mach_reboot on return.
81 */
82 void mach_reboot_fixups(void)
83 {
84 const struct device_fixup *cur;
85 struct pci_dev *dev;
86 int i;
87
88 /* we can be called from sysrq-B code.
89 * prohibited to dig PCI */
90 if (in_interrupt())
91 return;
92
93 for (i=0; i < ARRAY_SIZE(fixups_table)
94 cur = &(fixups_table[i]);
95 dev = pci_get_device(cur->vend
96 if (!dev)
97 continue;
98
99 cur->reboot_fixup(dev);
100 pci_dev_put(dev);
101 }
102 }
103
104
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