1#include <linux/pci.h>
2#include <linux/interrupt.h>
3#include <linux/timer.h>
4#include <linux/kernel.h>
5
6
7
8
9
10static struct pci_dev *fake_pci_dev(struct pci_channel *hose,
11 int top_bus, int busnr, int devfn)
12{
13 static struct pci_dev dev;
14 static struct pci_bus bus;
15
16 dev.bus = &bus;
17 dev.sysdata = hose;
18 dev.devfn = devfn;
19 bus.number = busnr;
20 bus.sysdata = hose;
21 bus.ops = hose->pci_ops;
22
23 if(busnr != top_bus)
24
25 bus.parent = &bus;
26 else
27 bus.parent = NULL;
28
29 return &dev;
30}
31
32#define EARLY_PCI_OP(rw, size, type) \
33int __init early_##rw##_config_##size(struct pci_channel *hose, \
34 int top_bus, int bus, int devfn, int offset, type value) \
35{ \
36 return pci_##rw##_config_##size( \
37 fake_pci_dev(hose, top_bus, bus, devfn), \
38 offset, value); \
39}
40
41EARLY_PCI_OP(read, byte, u8 *)
42EARLY_PCI_OP(read, word, u16 *)
43EARLY_PCI_OP(read, dword, u32 *)
44EARLY_PCI_OP(write, byte, u8)
45EARLY_PCI_OP(write, word, u16)
46EARLY_PCI_OP(write, dword, u32)
47
48int __init pci_is_66mhz_capable(struct pci_channel *hose,
49 int top_bus, int current_bus)
50{
51 u32 pci_devfn;
52 unsigned short vid;
53 int cap66 = -1;
54 u16 stat;
55
56 printk(KERN_INFO "PCI: Checking 66MHz capabilities...\n");
57
58 for (pci_devfn = 0; pci_devfn < 0xff; pci_devfn++) {
59 if (PCI_FUNC(pci_devfn))
60 continue;
61 if (early_read_config_word(hose, top_bus, current_bus,
62 pci_devfn, PCI_VENDOR_ID, &vid) !=
63 PCIBIOS_SUCCESSFUL)
64 continue;
65 if (vid == 0xffff)
66 continue;
67
68
69 if (cap66 < 0)
70 cap66 = 1;
71 if (cap66) {
72 early_read_config_word(hose, top_bus, current_bus,
73 pci_devfn, PCI_STATUS, &stat);
74 if (!(stat & PCI_STATUS_66MHZ)) {
75 printk(KERN_DEBUG
76 "PCI: %02x:%02x not 66MHz capable.\n",
77 current_bus, pci_devfn);
78 cap66 = 0;
79 break;
80 }
81 }
82 }
83
84 return cap66 > 0;
85}
86
87static void pcibios_enable_err(unsigned long __data)
88{
89 struct pci_channel *hose = (struct pci_channel *)__data;
90
91 del_timer(&hose->err_timer);
92 printk(KERN_DEBUG "PCI: re-enabling error IRQ.\n");
93 enable_irq(hose->err_irq);
94}
95
96static void pcibios_enable_serr(unsigned long __data)
97{
98 struct pci_channel *hose = (struct pci_channel *)__data;
99
100 del_timer(&hose->serr_timer);
101 printk(KERN_DEBUG "PCI: re-enabling system error IRQ.\n");
102 enable_irq(hose->serr_irq);
103}
104
105void pcibios_enable_timers(struct pci_channel *hose)
106{
107 if (hose->err_irq) {
108 init_timer(&hose->err_timer);
109 hose->err_timer.data = (unsigned long)hose;
110 hose->err_timer.function = pcibios_enable_err;
111 }
112
113 if (hose->serr_irq) {
114 init_timer(&hose->serr_timer);
115 hose->serr_timer.data = (unsigned long)hose;
116 hose->serr_timer.function = pcibios_enable_serr;
117 }
118}
119
120
121
122
123
124unsigned int pcibios_handle_status_errors(unsigned long addr,
125 unsigned int status,
126 struct pci_channel *hose)
127{
128 unsigned int cmd = 0;
129
130 if (status & PCI_STATUS_REC_MASTER_ABORT) {
131 printk(KERN_DEBUG "PCI: master abort, pc=0x%08lx\n", addr);
132 cmd |= PCI_STATUS_REC_MASTER_ABORT;
133 }
134
135 if (status & PCI_STATUS_REC_TARGET_ABORT) {
136 printk(KERN_DEBUG "PCI: target abort: ");
137 pcibios_report_status(PCI_STATUS_REC_TARGET_ABORT |
138 PCI_STATUS_SIG_TARGET_ABORT |
139 PCI_STATUS_REC_MASTER_ABORT, 1);
140 printk("\n");
141
142 cmd |= PCI_STATUS_REC_TARGET_ABORT;
143 }
144
145 if (status & (PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY)) {
146 printk(KERN_DEBUG "PCI: parity error detected: ");
147 pcibios_report_status(PCI_STATUS_PARITY |
148 PCI_STATUS_DETECTED_PARITY, 1);
149 printk("\n");
150
151 cmd |= PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY;
152
153
154 if (hose->err_irq) {
155 disable_irq_nosync(hose->err_irq);
156 hose->err_timer.expires = jiffies + HZ;
157 add_timer(&hose->err_timer);
158 }
159 }
160
161 return cmd;
162}
163
