Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

arch/arm/mach-ixp2000/pci.c

@@ -0,0 +1,235 @@
+/*
+ * arch/arm/mach-ixp2000/pci.c
+ *
+ * PCI routines for IXDP2400/IXDP2800 boards
+ *
+ * Original Author: Naeem Afzal <naeem.m.afzal@intel.com>
+ * Maintained by: Deepak Saxena <dsaxena@plexity.net>
+ *
+ * Copyright 2002 Intel Corp.
+ * Copyright (C) 2003-2004 MontaVista Software, Inc.
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ */
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/mach-types.h>
+#include <asm/hardware.h>
+
+#include <asm/mach/pci.h>
+
+static int pci_master_aborts = 0;
+
+static int clear_master_aborts(void);
+
+static u32 *
+ixp2000_pci_config_addr(unsigned int bus_nr, unsigned int devfn, int where)
+{
+	u32 *paddress;
+
+	if (PCI_SLOT(devfn) > 7)
+		return 0;
+
+	/* Must be dword aligned */
+	where &= ~3;
+
+	/*
+	 * For top bus, generate type 0, else type 1
+	 */
+	if (!bus_nr) {
+		/* only bits[23:16] are used for IDSEL */
+		paddress = (u32 *) (IXP2000_PCI_CFG0_VIRT_BASE
+				    | (1 << (PCI_SLOT(devfn) + 16))
+				    | (PCI_FUNC(devfn) << 8) | where);
+	} else {
+		paddress = (u32 *) (IXP2000_PCI_CFG1_VIRT_BASE 
+				    | (bus_nr << 16)
+				    | (PCI_SLOT(devfn) << 11)
+				    | (PCI_FUNC(devfn) << 8) | where);
+	}
+
+	return paddress;
+}
+
+/*
+ * Mask table, bits to mask for quantity of size 1, 2 or 4 bytes.
+ * 0 and 3 are not valid indexes...
+ */
+static u32 bytemask[] = {
+	/*0*/	0,
+	/*1*/	0xff,
+	/*2*/	0xffff,
+	/*3*/	0,
+	/*4*/	0xffffffff,
+};
+
+
+int ixp2000_pci_read_config(struct pci_bus *bus, unsigned int devfn, int where,
+				int size, u32 *value)
+{
+	u32 n;
+	u32 *addr;
+
+	n = where % 4;
+
+	addr = ixp2000_pci_config_addr(bus->number, devfn, where);
+	if (!addr)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	pci_master_aborts = 0;
+	*value = (*addr >> (8*n)) & bytemask[size];
+	if (pci_master_aborts) {
+		pci_master_aborts = 0;
+		*value = 0xffffffff;
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	}
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+/*
+ * We don't do error checks by callling clear_master_aborts() b/c the
+ * assumption is that the caller did a read first to make sure a device
+ * exists.
+ */
+int ixp2000_pci_write_config(struct pci_bus *bus, unsigned int devfn, int where,
+				int size, u32 value)
+{
+	u32 mask;
+	u32 *addr;
+	u32 temp;
+
+	mask = ~(bytemask[size] << ((where % 0x4) * 8));
+	addr = ixp2000_pci_config_addr(bus->number, devfn, where);
+	if (!addr)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+	temp = (u32) (value) << ((where % 0x4) * 8);
+	*addr = (*addr & mask) | temp;
+
+	clear_master_aborts();
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+
+static struct pci_ops ixp2000_pci_ops = {
+	.read	= ixp2000_pci_read_config,
+	.write	= ixp2000_pci_write_config
+};
+
+struct pci_bus *ixp2000_pci_scan_bus(int nr, struct pci_sys_data *sysdata)
+{
+	return pci_scan_bus(sysdata->busnr, &ixp2000_pci_ops, sysdata);
+}
+
+
+int ixp2000_pci_abort_handler(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
+{
+
+	volatile u32 temp;
+	unsigned long flags;
+
+	pci_master_aborts = 1;
+
+	local_irq_save(flags);
+	temp = *(IXP2000_PCI_CONTROL);
+	if (temp & ((1 << 8) | (1 << 5))) {
+		ixp2000_reg_write(IXP2000_PCI_CONTROL, temp);
+	}
+
+	temp = *(IXP2000_PCI_CMDSTAT);
+	if (temp & (1 << 29)) {
+		while (temp & (1 << 29)) {	
+			ixp2000_reg_write(IXP2000_PCI_CMDSTAT, temp);
+			temp = *(IXP2000_PCI_CMDSTAT);
+		}
+	}
+	local_irq_restore(flags);
+
+	/*
+	 * If it was an imprecise abort, then we need to correct the
+	 * return address to be _after_ the instruction.
+	 */
+	if (fsr & (1 << 10))
+		regs->ARM_pc += 4;
+
+	return 0;
+}
+
+int
+clear_master_aborts(void)
+{
+	volatile u32 temp;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	temp = *(IXP2000_PCI_CONTROL);
+	if (temp & ((1 << 8) | (1 << 5))) {	
+		ixp2000_reg_write(IXP2000_PCI_CONTROL, temp);
+	}
+
+	temp = *(IXP2000_PCI_CMDSTAT);
+	if (temp & (1 << 29)) {
+		while (temp & (1 << 29)) {
+			ixp2000_reg_write(IXP2000_PCI_CMDSTAT, temp);
+			temp = *(IXP2000_PCI_CMDSTAT);
+		}
+	}
+	local_irq_restore(flags);
+
+	return 0;
+}
+
+void __init
+ixp2000_pci_preinit(void)
+{
+	hook_fault_code(16+6, ixp2000_pci_abort_handler, SIGBUS,
+				"PCI config cycle to non-existent device");
+}
+
+
+/*
+ * IXP2000 systems often have large resource requirements, so we just
+ * use our own resource space.
+ */
+static struct resource ixp2000_pci_mem_space = {
+	.start	= 0x00000000,
+	.end	= 0xffffffff,
+	.flags	= IORESOURCE_MEM,
+	.name	= "PCI Mem Space"
+};
+
+static struct resource ixp2000_pci_io_space = {
+	.start	= 0x00000000,
+	.end	= 0xffffffff,
+	.flags	= IORESOURCE_IO,
+	.name	= "PCI I/O Space"
+};
+
+int ixp2000_pci_setup(int nr, struct pci_sys_data *sys)
+{
+	if (nr >= 1)
+		return 0;
+
+	sys->resource[0] = &ixp2000_pci_io_space;
+	sys->resource[1] = &ixp2000_pci_mem_space;
+	sys->resource[2] = NULL;
+
+	return 1;
+}
+