IRQ setup for EPIA

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1174 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

2 files changed, 125 insertions, 0 deletions

diff --git a/src/devices/pci_device.c b/src/devices/pci_device.c
index a4789d22f4..a91381f0d6 100644
--- a/src/devices/pci_device.c
+++ b/src/devices/pci_device.c
@@ -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]);
+			}
+		}
+	}
+}
diff --git a/src/southbridge/via/vt8231/vt8231.c b/src/southbridge/via/vt8231/vt8231.c
index 95e2ca573a..e849be16ac 100644
--- a/src/southbridge/via/vt8231/vt8231.c
+++ b/src/southbridge/via/vt8231/vt8231.c
@@ -146,12 +146,64 @@ static void ethernet_fixup()
  * in the C code. 
  */
 static void vt8231_pci_enable(struct southbridge_via_vt8231_config *conf) {
+  /*
 	unsigned long busdevfn = 0x8000;
 	if (conf->enable_ide) {
 		printk_spew("%s: enabling IDE function\n", __FUNCTION__);
 	}
+  */
+}
+
+/* PIRQ init
+ */
+void pci_assign_irqs(unsigned bus, unsigned slot, const unsigned char pIntAtoD[4]);
+
 
+static const unsigned char southbridgeIrqs[4] = { 11, 5, 10, 12 };
+static const unsigned char enetIrqs[4] = { 11, 5, 10, 12 };
+static const unsigned char slotIrqs[4] = { 5, 10, 12, 11 };
+
+/*
+	Our IDSEL mappings are as follows
+	PCI slot is AD31          (device 15) (00:14.0)
+	Southbridge is AD28       (device 12) (00:11.0)
+*/
+static void pci_routing_fixup(void)
+{
+  device_t dev;
+
+        dev = dev_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231, 0);
+	printk_info("%s: dev is %p\n", __FUNCTION__, dev);
+	if (dev) {
+		/* initialize PCI interupts - these assignments depend
+		   on the PCB routing of PINTA-D 
+
+		   PINTA = IRQ11
+		   PINTB = IRQ5
+		   PINTC = IRQ10
+		   PINTD = IRQ12
+		*/
+		pci_write_config8(dev, 0x55, 0xb0);
+		pci_write_config8(dev, 0x56, 0xa5);
+		pci_write_config8(dev, 0x57, 0xc0);
+	}
+
+	// Standard southbridge components
+	printk_info("setting southbridge\n");
+	pci_assign_irqs(0, 0x11, southbridgeIrqs);
+
+	// Ethernet built into southbridge
+	printk_info("setting ethernet\n");
+	pci_assign_irqs(0, 0x12, enetIrqs);
+
+	// PCI slot
+	printk_info("setting pci slot\n");
+	pci_assign_irqs(0, 0x14, slotIrqs);
+	printk_info("%s: DONE\n", __FUNCTION__);
 }
+
+
+
 static void vt8231_init(struct southbridge_via_vt8231_config *conf)
 {
   unsigned char enables;
@@ -377,6 +429,13 @@ southbridge_init(struct chip *chip, enum chip_pass pass)
 
   case CONF_PASS_POST_PCI:
     vt8231_init(conf);
+    printk_err("FUCK! ROUTING FIXUP!\n");
+    pci_routing_fixup();
+
+    break;
+  case CONF_PASS_PRE_BOOT:
+    printk_err("FUCK! ROUTING FIXUP!\n");
+    pci_routing_fixup();
     break;
 
   default: