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IRQ setup for EPIA

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git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1174 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Ronald G. Minnich
2003-10-02 00:08:42 +00:00
parent e0005ba6d1
commit 6dd6c68507
2 changed files with 126 additions and 1 deletions
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66
src/devices/pci_device.c
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@@ -14,6 +14,7 @@
#include <stdint.h>
#include <bitops.h>
#include <string.h>
#include <arch/io.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
@@ -679,3 +680,68 @@ unsigned int pci_scan_bridge(struct device *dev, unsigned int max)
printk_spew("%s returns max %d\n", __FUNCTION__, max);
return max;
}
/*
Tell the EISA int controller this int must be level triggered
THIS IS A KLUDGE -- sorry, this needs to get cleaned up.
*/
static void pci_level_irq(unsigned char intNum)
{
unsigned intBits = inb(0x4d0) | (((unsigned) inb(0x4d1)) << 8);
intBits |= (1 << intNum);
// Write new values
outb((unsigned char) intBits, 0x4d0);
outb((unsigned char) (intBits >> 8), 0x4d1);
}
/*
This function assigns IRQs for all functions contained within
the indicated device address. If the device does not exist or does
not require interrupts then this function has no effect.
This function should be called for each PCI slot in your system.
pIntAtoD is an array of IRQ #s that are assigned to PINTA through PINTD of
this slot.
The particular irq #s that are passed in depend on the routing inside
your southbridge and on your motherboard.
-kevinh@ispiri.com
*/
void pci_assign_irqs(unsigned bus, unsigned slot,
const unsigned char pIntAtoD[4])
{
unsigned functNum;
device_t pdev;
unsigned char line;
unsigned char irq;
unsigned char readback;
/* Each slot may contain up to eight functions */
for (functNum = 0; functNum < 8; functNum++) {
pdev = dev_find_slot(bus, (slot << 3) + functNum);
if (pdev) {
line = pci_read_config8(pdev, PCI_INTERRUPT_PIN);
// PCI spec says all other values are reserved
if ((line >= 1) && (line <= 4)) {
irq = pIntAtoD[line - 1];
printk_debug("Assigning IRQ %d to %d:%x.%d\n", \
irq, bus, slot, functNum);
pci_write_config8(pdev, PCI_INTERRUPT_LINE,\
pIntAtoD[line - 1]);
readback = pci_read_config8(pdev, PCI_INTERRUPT_LINE);
printk_debug(" Readback = %d\n", readback);
// Change to level triggered
pci_level_irq(pIntAtoD[line - 1]);
}
}
}
}