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// SPDX-License-Identifier: GPL-2.0
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/kernel.h>
/*
* These functions are used early on before PCI scanning is done
* and all of the pci_dev and pci_bus structures have been created.
*/
static struct pci_dev *fake_pci_dev(struct pci_channel *hose,
int top_bus, int busnr, int devfn)
{
static struct pci_dev dev;
static struct pci_bus bus;
dev.bus = &bus;
dev.sysdata = hose;
dev.devfn = devfn;
bus.number = busnr;
bus.sysdata = hose;
bus.ops = hose->pci_ops;
if(busnr != top_bus)
/* Fake a parent bus structure. */
bus.parent = &bus;
else
bus.parent = NULL;
return &dev;
}
#define EARLY_PCI_OP(rw, size, type) \
int __init early_##rw##_config_##size(struct pci_channel *hose, \
int top_bus, int bus, int devfn, int offset, type value) \
{ \
return pci_##rw##_config_##size( \
fake_pci_dev(hose, top_bus, bus, devfn), \
offset, value); \
}
EARLY_PCI_OP(read, byte, u8 *)
EARLY_PCI_OP(read, word, u16 *)
EARLY_PCI_OP(read, dword, u32 *)
EARLY_PCI_OP(write, byte, u8)
EARLY_PCI_OP(write, word, u16)
EARLY_PCI_OP(write, dword, u32)
int __init pci_is_66mhz_capable(struct pci_channel *hose,
int top_bus, int current_bus)
{
u32 pci_devfn;
unsigned short vid;
int cap66 = -1;
u16 stat;
pr_info("PCI: Checking 66MHz capabilities...\n");
for (pci_devfn = 0; pci_devfn < 0xff; pci_devfn++) {
if (PCI_FUNC(pci_devfn))
continue;
if (early_read_config_word(hose, top_bus, current_bus,
pci_devfn, PCI_VENDOR_ID, &vid) !=
PCIBIOS_SUCCESSFUL)
continue;
if (vid == 0xffff)
continue;
/* check 66MHz capability */
if (cap66 < 0)
cap66 = 1;
if (cap66) {
early_read_config_word(hose, top_bus, current_bus,
pci_devfn, PCI_STATUS, &stat);
if (!(stat & PCI_STATUS_66MHZ)) {
printk(KERN_DEBUG
"PCI: %02x:%02x not 66MHz capable.\n",
current_bus, pci_devfn);
cap66 = 0;
break;
}
}
}
return cap66 > 0;
}
static void pcibios_enable_err(struct timer_list *t)
{
struct pci_channel *hose = from_timer(hose, t, err_timer);
del_timer(&hose->err_timer);
printk(KERN_DEBUG "PCI: re-enabling error IRQ.\n");
enable_irq(hose->err_irq);
}
static void pcibios_enable_serr(struct timer_list *t)
{
struct pci_channel *hose = from_timer(hose, t, serr_timer);
del_timer(&hose->serr_timer);
printk(KERN_DEBUG "PCI: re-enabling system error IRQ.\n");
enable_irq(hose->serr_irq);
}
void pcibios_enable_timers(struct pci_channel *hose)
{
if (hose->err_irq) {
timer_setup(&hose->err_timer, pcibios_enable_err, 0);
}
if (hose->serr_irq) {
timer_setup(&hose->serr_timer, pcibios_enable_serr, 0);
}
}
/*
* A simple handler for the regular PCI status errors, called from IRQ
* context.
*/
unsigned int pcibios_handle_status_errors(unsigned long addr,
unsigned int status,
struct pci_channel *hose)
{
unsigned int cmd = 0;
if (status & PCI_STATUS_REC_MASTER_ABORT) {
printk(KERN_DEBUG "PCI: master abort, pc=0x%08lx\n", addr);
cmd |= PCI_STATUS_REC_MASTER_ABORT;
}
if (status & PCI_STATUS_REC_TARGET_ABORT) {
printk(KERN_DEBUG "PCI: target abort: ");
pcibios_report_status(PCI_STATUS_REC_TARGET_ABORT |
PCI_STATUS_SIG_TARGET_ABORT |
PCI_STATUS_REC_MASTER_ABORT, 1);
pr_cont("\n");
cmd |= PCI_STATUS_REC_TARGET_ABORT;
}
if (status & (PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY)) {
printk(KERN_DEBUG "PCI: parity error detected: ");
pcibios_report_status(PCI_STATUS_PARITY |
PCI_STATUS_DETECTED_PARITY, 1);
pr_cont("\n");
cmd |= PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY;
/* Now back off of the IRQ for awhile */
if (hose->err_irq) {
disable_irq_nosync(hose->err_irq);
hose->err_timer.expires = jiffies + HZ;
add_timer(&hose->err_timer);
}
}
return cmd;
}
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