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common.c
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1 #include <linux/pci.h>
2 #include <linux/interrupt.h>
3 #include <linux/timer.h>
4 #include <linux/kernel.h>
5 
6 /*
7  * These functions are used early on before PCI scanning is done
8  * and all of the pci_dev and pci_bus structures have been created.
9  */
10 static 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  /* Fake a parent bus structure. */
25  bus.parent = &bus;
26  else
27  bus.parent = NULL;
28 
29  return &dev;
30 }
31 
32 #define EARLY_PCI_OP(rw, size, type) \
33 int __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 
41 EARLY_PCI_OP(read, byte, u8 *)
42 EARLY_PCI_OP(read, word, u16 *)
43 EARLY_PCI_OP(read, dword, u32 *)
44 EARLY_PCI_OP(write, byte, u8)
45 EARLY_PCI_OP(write, word, u16)
46 EARLY_PCI_OP(write, dword, u32)
47 
48 int __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  /* check 66MHz capability */
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 
87 static 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 
96 static 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 
105 void 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  * A simple handler for the regular PCI status errors, called from IRQ
122  * context.
123  */
124 unsigned 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  /* Now back off of the IRQ for awhile */
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 }
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