1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/interrupt.h>
4 #include <linux/timer.h>
5 #include <linux/kernel.h>
8 * These functions are used early on before PCI scanning is done
9 * and all of the pci_dev and pci_bus structures have been created.
11 static struct pci_dev *fake_pci_dev(struct pci_channel *hose,
12 int top_bus, int busnr, int devfn)
14 static struct pci_dev dev;
15 static struct pci_bus bus;
22 bus.ops = hose->pci_ops;
25 /* Fake a parent bus structure. */
33 #define EARLY_PCI_OP(rw, size, type) \
34 int __init early_##rw##_config_##size(struct pci_channel *hose, \
35 int top_bus, int bus, int devfn, int offset, type value) \
37 return pci_##rw##_config_##size( \
38 fake_pci_dev(hose, top_bus, bus, devfn), \
42 EARLY_PCI_OP(read, byte, u8 *)
43 EARLY_PCI_OP(read, word, u16 *)
44 EARLY_PCI_OP(read, dword, u32 *)
45 EARLY_PCI_OP(write, byte, u8)
46 EARLY_PCI_OP(write, word, u16)
47 EARLY_PCI_OP(write, dword, u32)
49 int __init pci_is_66mhz_capable(struct pci_channel *hose,
50 int top_bus, int current_bus)
58 pr_info("PCI: Checking 66MHz capabilities...\n");
60 for (pci_devfn = 0; pci_devfn < 0xff; pci_devfn++) {
61 if (PCI_FUNC(pci_devfn))
63 ret = early_read_config_word(hose, top_bus, current_bus,
64 pci_devfn, PCI_VENDOR_ID, &vid);
65 if (ret != PCIBIOS_SUCCESSFUL)
67 if (PCI_POSSIBLE_ERROR(vid))
70 /* check 66MHz capability */
74 early_read_config_word(hose, top_bus, current_bus,
75 pci_devfn, PCI_STATUS, &stat);
76 if (!(stat & PCI_STATUS_66MHZ)) {
78 "PCI: %02x:%02x not 66MHz capable.\n",
79 current_bus, pci_devfn);
89 static void pcibios_enable_err(struct timer_list *t)
91 struct pci_channel *hose = from_timer(hose, t, err_timer);
93 del_timer(&hose->err_timer);
94 printk(KERN_DEBUG "PCI: re-enabling error IRQ.\n");
95 enable_irq(hose->err_irq);
98 static void pcibios_enable_serr(struct timer_list *t)
100 struct pci_channel *hose = from_timer(hose, t, serr_timer);
102 del_timer(&hose->serr_timer);
103 printk(KERN_DEBUG "PCI: re-enabling system error IRQ.\n");
104 enable_irq(hose->serr_irq);
107 void pcibios_enable_timers(struct pci_channel *hose)
110 timer_setup(&hose->err_timer, pcibios_enable_err, 0);
113 if (hose->serr_irq) {
114 timer_setup(&hose->serr_timer, pcibios_enable_serr, 0);
119 * A simple handler for the regular PCI status errors, called from IRQ
122 unsigned int pcibios_handle_status_errors(unsigned long addr,
124 struct pci_channel *hose)
126 unsigned int cmd = 0;
128 if (status & PCI_STATUS_REC_MASTER_ABORT) {
129 printk(KERN_DEBUG "PCI: master abort, pc=0x%08lx\n", addr);
130 cmd |= PCI_STATUS_REC_MASTER_ABORT;
133 if (status & PCI_STATUS_REC_TARGET_ABORT) {
134 printk(KERN_DEBUG "PCI: target abort: ");
135 pcibios_report_status(PCI_STATUS_REC_TARGET_ABORT |
136 PCI_STATUS_SIG_TARGET_ABORT |
137 PCI_STATUS_REC_MASTER_ABORT, 1);
140 cmd |= PCI_STATUS_REC_TARGET_ABORT;
143 if (status & (PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY)) {
144 printk(KERN_DEBUG "PCI: parity error detected: ");
145 pcibios_report_status(PCI_STATUS_PARITY |
146 PCI_STATUS_DETECTED_PARITY, 1);
149 cmd |= PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY;
151 /* Now back off of the IRQ for awhile */
153 disable_irq_nosync(hose->err_irq);
154 hose->err_timer.expires = jiffies + HZ;
155 add_timer(&hose->err_timer);