2 #include <linux/interrupt.h>
3 #include <linux/timer.h>
4 #include <linux/kernel.h>
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.
10 static struct pci_dev *fake_pci_dev(struct pci_channel *hose,
11 int top_bus, int busnr, int devfn)
13 static struct pci_dev dev;
14 static struct pci_bus bus;
21 bus.ops = hose->pci_ops;
24 /* Fake a parent bus structure. */
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) \
36 return pci_##rw##_config_##size( \
37 fake_pci_dev(hose, top_bus, bus, devfn), \
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)
48 int __init pci_is_66mhz_capable(struct pci_channel *hose,
49 int top_bus, int current_bus)
56 printk(KERN_INFO "PCI: Checking 66MHz capabilities...\n");
58 for (pci_devfn = 0; pci_devfn < 0xff; pci_devfn++) {
59 if (PCI_FUNC(pci_devfn))
61 if (early_read_config_word(hose, top_bus, current_bus,
62 pci_devfn, PCI_VENDOR_ID, &vid) !=
68 /* check 66MHz capability */
72 early_read_config_word(hose, top_bus, current_bus,
73 pci_devfn, PCI_STATUS, &stat);
74 if (!(stat & PCI_STATUS_66MHZ)) {
76 "PCI: %02x:%02x not 66MHz capable.\n",
77 current_bus, pci_devfn);
87 static void pcibios_enable_err(unsigned long __data)
89 struct pci_channel *hose = (struct pci_channel *)__data;
91 del_timer(&hose->err_timer);
92 printk(KERN_DEBUG "PCI: re-enabling error IRQ.\n");
93 enable_irq(hose->err_irq);
96 static void pcibios_enable_serr(unsigned long __data)
98 struct pci_channel *hose = (struct pci_channel *)__data;
100 del_timer(&hose->serr_timer);
101 printk(KERN_DEBUG "PCI: re-enabling system error IRQ.\n");
102 enable_irq(hose->serr_irq);
105 void pcibios_enable_timers(struct pci_channel *hose)
108 init_timer(&hose->err_timer);
109 hose->err_timer.data = (unsigned long)hose;
110 hose->err_timer.function = pcibios_enable_err;
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;
121 * A simple handler for the regular PCI status errors, called from IRQ
124 unsigned int pcibios_handle_status_errors(unsigned long addr,
126 struct pci_channel *hose)
128 unsigned int cmd = 0;
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;
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);
142 cmd |= PCI_STATUS_REC_TARGET_ABORT;
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);
151 cmd |= PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY;
153 /* Now back off of the IRQ for awhile */
155 disable_irq_nosync(hose->err_irq);
156 hose->err_timer.expires = jiffies + HZ;
157 add_timer(&hose->err_timer);