patch-2.1.121 linux/arch/arm/kernel/dec21285.c

• Lines: 243
• Date: Sun Sep 6 10:44:47 1998
• Orig file: v2.1.120/linux/arch/arm/kernel/dec21285.c
• Orig date: Thu Aug 6 14:06:28 1998

diff -u --recursive --new-file v2.1.120/linux/arch/arm/kernel/dec21285.c linux/arch/arm/kernel/dec21285.c
@@ -1,31 +1,42 @@
 /*
  * arch/arm/kernel/dec21285.c: PCI functions for DEC 21285
  *
- * Copyright (C) 1998 Russell King
+ * Copyright (C) 1998 Russell King, Phil Blundell
  */
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/init.h>
 
-int pcibios_present(void)
+#include <asm/system.h>
+
+#define MAX_SLOTS		20
+
+int
+pcibios_present(void)
 {
 	return 1;
 }
 
-static unsigned long pcibios_base_address(unsigned char dev_fn)
+static unsigned long
+pcibios_base_address(unsigned char bus, unsigned char dev_fn)
 {
-	int slot = PCI_SLOT(dev_fn);
-
-	if (slot < 4)
-		return 0xf8000000 + (1 << (19 - slot));
-	else
-		return 0;
+	if (bus == 0) {
+		int slot = PCI_SLOT(dev_fn);
+		
+		if (slot < MAX_SLOTS)
+			return 0xf8c00000 + (slot << 11);
+		else
+			return 0;
+	} else {
+		return 0xf9000000 | (bus << 16) | (dev_fn << 8);
+	}
 }
 
-int pcibios_read_config_byte(unsigned char bus, unsigned char dev_fn,
-			     unsigned char where, unsigned char *val)
+int
+pcibios_read_config_byte(unsigned char bus, unsigned char dev_fn,
+			 unsigned char where, unsigned char *val)
 {
-	unsigned long addr = pcibios_base_address(dev_fn);
+	unsigned long addr = pcibios_base_address(bus, dev_fn);
 	unsigned char v;
 
 	if (addr)
@@ -38,10 +49,11 @@
 	return PCIBIOS_SUCCESSFUL;
 }
 
-int pcibios_read_config_word(unsigned char bus, unsigned char dev_fn,
-			     unsigned char where, unsigned short *val)
+int
+pcibios_read_config_word(unsigned char bus, unsigned char dev_fn,
+			 unsigned char where, unsigned short *val)
 {
-	unsigned long addr = pcibios_base_address(dev_fn);
+	unsigned long addr = pcibios_base_address(bus, dev_fn);
 	unsigned short v;
 
 	if (addr)
@@ -54,10 +66,11 @@
 	return PCIBIOS_SUCCESSFUL;
 }
 
-int pcibios_read_config_dword(unsigned char bus, unsigned char dev_fn,
-			      unsigned char where, unsigned int *val)
+int
+pcibios_read_config_dword(unsigned char bus, unsigned char dev_fn,
+			  unsigned char where, unsigned int *val)
 {
-	unsigned long addr = pcibios_base_address(dev_fn);
+	unsigned long addr = pcibios_base_address(bus, dev_fn);
 	unsigned int v;
 
 	if (addr)
@@ -70,10 +83,11 @@
 	return PCIBIOS_SUCCESSFUL;
 }
 
-int pcibios_write_config_byte(unsigned char bus, unsigned char dev_fn,
-			     unsigned char where, unsigned char val)
+int
+pcibios_write_config_byte(unsigned char bus, unsigned char dev_fn,
+			  unsigned char where, unsigned char val)
 {
-	unsigned long addr = pcibios_base_address(dev_fn);
+	unsigned long addr = pcibios_base_address(bus, dev_fn);
 
 	if (addr)
 		__asm__("str%?b	%0, [%1, %2]"
@@ -81,10 +95,11 @@
 	return PCIBIOS_SUCCESSFUL;
 }
 
-int pcibios_write_config_word(unsigned char bus, unsigned char dev_fn,
-			      unsigned char where, unsigned short val)
+int
+pcibios_write_config_word(unsigned char bus, unsigned char dev_fn,
+			  unsigned char where, unsigned short val)
 {
-	unsigned long addr = pcibios_base_address(dev_fn);
+	unsigned long addr = pcibios_base_address(bus, dev_fn);
 
 	if (addr)
 		__asm__("str%?h	%0, [%1, %2]"
@@ -92,10 +107,11 @@
 	return PCIBIOS_SUCCESSFUL;
 }
 
-int pcibios_write_config_dword(unsigned char bus, unsigned char dev_fn,
-			       unsigned char where, unsigned int val)
+int
+pcibios_write_config_dword(unsigned char bus, unsigned char dev_fn,
+			   unsigned char where, unsigned int val)
 {
-	unsigned long addr = pcibios_base_address(dev_fn);
+	unsigned long addr = pcibios_base_address(bus, dev_fn);
 
 	if (addr)
 		__asm__("str%?	%0, [%1, %2]"
@@ -103,35 +119,72 @@
 	return PCIBIOS_SUCCESSFUL;
 }
 
-static int irq[] = { 18, 8, 9, 11 };
+static int irqmap_ebsa[] __initdata = { 9, 8, 18, 11 };
+static int irqmap_cats[] __initdata = { 18, 8, 9, 11 };
+
+__initfunc(static int ebsa_irqval(struct pci_dev *dev))
+{
+	unsigned char pin;
+	
+	pcibios_read_config_byte(dev->bus->number,
+				 dev->devfn,
+				 PCI_INTERRUPT_PIN,
+				 &pin);
+	
+	return irqmap_ebsa[(PCI_SLOT(dev->devfn) + pin) & 3];
+}
+
+__initfunc(static int cats_irqval(struct pci_dev *dev))
+{
+	if (dev->irq >= 128)
+		return 32 + (dev->irq & 0x1f);
+
+	switch (dev->irq) {
+	case 1:
+	case 2:
+	case 3:
+	case 4:
+		return irqmap_cats[dev->irq - 1];
+	case 0:
+		return 0;
+	}
+
+	printk("PCI: device %02x:%02x has unknown irq line %x\n",
+	       dev->bus->number, dev->devfn, dev->irq);
+	return 0;
+}
 
 __initfunc(void pcibios_fixup(void))
 {
 	struct pci_dev *dev;
-	unsigned char pin;
-	unsigned int cmd;
+	unsigned char cmd;
 
 	for (dev = pci_devices; dev; dev = dev->next) {
-		pcibios_read_config_byte(dev->bus->number,
-					 dev->devfn,
-					 PCI_INTERRUPT_PIN,
-					 &pin);
-
-		dev->irq = irq[(PCI_SLOT(dev->devfn) + pin) & 3];
-
-		pcibios_write_config_byte(dev->bus->number,
-					  dev->devfn,
-					  PCI_INTERRUPT_LINE,
-					  dev->irq);
+		/* sort out the irq mapping for this device */
+		switch (machine_type) {
+		case MACH_TYPE_EBSA285:
+			dev->irq = ebsa_irqval(dev);
+			break;
+		case MACH_TYPE_CATS:
+			dev->irq = cats_irqval(dev);
+			break;
+		}
+		pcibios_write_config_byte(dev->bus->number, dev->devfn,
+					  PCI_INTERRUPT_LINE, dev->irq);
 
-		printk("PCI: %02x:%02x [%04x/%04x] pin %d irq %d\n",
+		printk(KERN_DEBUG
+		       "PCI: %02x:%02x [%04x/%04x] on irq %d\n",
 			dev->bus->number, dev->devfn,
-			dev->vendor, dev->device,
-			pin, dev->irq);
+			dev->vendor, dev->device, dev->irq);
 
-		/* Turn on bus mastering - boot loader doesn't - perhaps it should! */
-		pcibios_read_config_byte(dev->bus->number, dev->devfn, PCI_COMMAND, &cmd);
-		pcibios_write_config_byte(dev->bus->number, dev->devfn, PCI_COMMAND, cmd | PCI_COMMAND_MASTER);
+		/* Turn on bus mastering - boot loader doesn't
+		 * - perhaps it should! - dag
+		 */
+		pcibios_read_config_byte(dev->bus->number, dev->devfn,
+					 PCI_COMMAND, &cmd);
+		cmd |= PCI_COMMAND_MASTER;
+		pcibios_write_config_byte(dev->bus->number, dev->devfn,
+					  PCI_COMMAND, cmd);
 	}
 }
 
@@ -141,10 +194,16 @@
 
 	rev = *(unsigned char *)0xfe000008;
 	printk("DEC21285 PCI revision %02X\n", rev);
-}
 
-__initfunc(void pcibios_fixup_bus(struct pci_bus *bus))
-{
+	/*
+	 * Map our SDRAM at a known address in PCI space, just in case
+	 * the firmware had other ideas.  Using a nonzero base is slightly
+	 * bizarre but apparently necessary to avoid problems with some
+	 * video cards.
+	 *
+	 * We should really only do this if we are the configuration master.
+	 */
+	*((unsigned long *)0xfe000018) = 0x10000000;
 }
 
 __initfunc(void pcibios_fixup_bus(struct pci_bus *bus))