sys_nautilus.c

一个2.4.21版本的嵌入式linux内核

/*
 *	linux/arch/alpha/kernel/sys_nautilus.c
 *
 *	Copyright (C) 1995 David A Rusling
 *	Copyright (C) 1998 Richard Henderson
 *	Copyright (C) 1999 Alpha Processor, Inc.,
 *		(David Daniel, Stig Telfer, Soohoon Lee)
 *
 * Code supporting NAUTILUS systems.
 *
 *
 * NAUTILUS has the following I/O features:
 *
 * a) Driven by AMD 751 aka IRONGATE (northbridge):
 *     4 PCI slots
 *     1 AGP slot
 *
 * b) Driven by ALI M1543C (southbridge)
 *     2 ISA slots
 *     2 IDE connectors
 *     1 dual drive capable FDD controller
 *     2 serial ports
 *     1 ECP/EPP/SP parallel port
 *     2 USB ports
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/reboot.h>
#include <linux/bootmem.h>

#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/dma.h>
#include <asm/irq.h>
#include <asm/bitops.h>
#include <asm/mmu_context.h>
#include <asm/io.h>
#include <asm/pci.h>
#include <asm/pgtable.h>
#include <asm/core_irongate.h>
#include <asm/hwrpb.h>

#include "proto.h"
#include "err_impl.h"
#include "irq_impl.h"
#include "pci_impl.h"
#include "machvec_impl.h"


static void __init
nautilus_init_irq(void)
{
	if (alpha_using_srm) {
		alpha_mv.device_interrupt = srm_device_interrupt;
	}

	init_i8259a_irqs();
	common_init_isa_dma();
}

static int __init
nautilus_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
	/* Preserve the IRQ set up by the console.  */

	u8 irq;
	pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
	return irq;
}

void
nautilus_kill_arch(int mode)
{
	switch (mode) {
	case LINUX_REBOOT_CMD_RESTART:
		if (! alpha_using_srm) {
			u8 t8;
			pcibios_read_config_byte(0, 0x38, 0x43, &t8);
			pcibios_write_config_byte(0, 0x38, 0x43, t8 | 0x80);
			outb(1, 0x92);
			outb(0, 0x92);
			/* NOTREACHED */
		}
		break;

	case LINUX_REBOOT_CMD_POWER_OFF:
		{
			u32 pmuport;
			pcibios_read_config_dword(0, 0x88, 0x10, &pmuport);
			pmuport &= 0xfffe;
			outl(0xffff, pmuport); /* clear pending events */
			outw(0x2000, pmuport+4); /* power off */
			/* NOTREACHED */
		}
		break;
	}
}

/* Perform analysis of a machine check that arrived from the system (NMI) */

static void
naut_sys_machine_check(unsigned long vector, unsigned long la_ptr,
		       struct pt_regs *regs)
{
	printk("PC %lx RA %lx\n", regs->pc, regs->r26);
	irongate_pci_clr_err();
}

/* Machine checks can come from two sources - those on the CPU and those
   in the system.  They are analysed separately but all starts here.  */

void
nautilus_machine_check(unsigned long vector, unsigned long la_ptr,
		       struct pt_regs *regs)
{
	char *mchk_class;

	/* Now for some analysis.  Machine checks fall into two classes --
	   those picked up by the system, and those picked up by the CPU.
	   Add to that the two levels of severity - correctable or not.  */

	if (vector == SCB_Q_SYSMCHK
	    && ((IRONGATE0->dramms & 0x300) == 0x300)) {
		unsigned long nmi_ctl;

		/* Clear ALI NMI */
		nmi_ctl = inb(0x61);
		nmi_ctl |= 0x0c;
		outb(nmi_ctl, 0x61);
		nmi_ctl &= ~0x0c;
		outb(nmi_ctl, 0x61);

		/* Write again clears error bits.  */
		IRONGATE0->stat_cmd = IRONGATE0->stat_cmd & ~0x100;
		mb();
		IRONGATE0->stat_cmd;

		/* Write again clears error bits.  */
		IRONGATE0->dramms = IRONGATE0->dramms;
		mb();
		IRONGATE0->dramms;

		draina();
		wrmces(0x7);
		mb();
		return;
	}

	if (vector == SCB_Q_SYSERR)
		mchk_class = "Correctable";
	else if (vector == SCB_Q_SYSMCHK)
		mchk_class = "Fatal";
	else {
		ev6_machine_check(vector, la_ptr, regs);
		return;
	}

	printk(KERN_CRIT "NAUTILUS Machine check 0x%lx "
			 "[%s System Machine Check (NMI)]\n",
	       vector, mchk_class);

	naut_sys_machine_check(vector, la_ptr, regs);

	/* Tell the PALcode to clear the machine check */
	draina();
	wrmces(0x7);
	mb();
}


extern void free_reserved_mem(void *, void *);
extern void pbus_size_bridges(struct pci_bus *);
extern void pbus_assign_resources(struct pci_bus *);

static struct resource irongate_mem = {
	.name	= "Irongate PCI MEM",
	.flags	= IORESOURCE_MEM,
};

void __init
nautilus_init_pci(void)
{
	struct pci_controller *hose = hose_head;
	struct pci_bus *bus;
	struct pci_dev *dev;
	unsigned long bus_align, bus_size, pci_mem;
	unsigned long memtop = max_low_pfn << PAGE_SHIFT;

	/* Scan our single hose.  */
	bus = pci_scan_bus(0, alpha_mv.pci_ops, hose);
	hose->bus = bus;
	hose->last_busno = bus->subordinate;

	bus->self = pci_find_slot(0, 0);
	bus->resource[1] = &irongate_mem;

	pbus_size_bridges(bus);

	/* IO port range. */
	bus->resource[0]->start = 0;
	bus->resource[0]->end = 0xffff;

	/* Set up PCI memory range - limit is hardwired to 0xffffffff,
	   base must be at aligned to 16Mb. */
	bus_align = bus->resource[1]->start;
	bus_size = bus->resource[1]->end + 1 - bus_align;
	if (bus_align < 0x1000000UL)
		bus_align = 0x1000000UL;

	pci_mem = (0x100000000UL - bus_size) & -bus_align;

	bus->resource[1]->start = pci_mem;
	bus->resource[1]->end = 0xffffffffUL;
	if (request_resource(&iomem_resource, bus->resource[1]) < 0)
		printk(KERN_ERR "Failed to request MEM on hose 0\n");

	if (pci_mem < memtop && pci_mem > alpha_mv.min_mem_address) {
		free_reserved_mem(__va(alpha_mv.min_mem_address),
				  __va(pci_mem));
		printk("nautilus_init_pci: %ldk freed\n",
			(pci_mem - alpha_mv.min_mem_address) >> 10);
	}

	if ((IRONGATE0->dev_vendor >> 16) > 0x7006)	/* Albacore? */
		IRONGATE0->pci_mem = pci_mem;

	pbus_assign_resources(bus);

	pci_for_each_dev(dev) {
		pdev_enable_device(dev);
	}
	pci_fixup_irqs(alpha_mv.pci_swizzle, alpha_mv.pci_map_irq);
}

/*
 * The System Vectors
 */

struct alpha_machine_vector nautilus_mv __initmv = {
	vector_name:		"Nautilus",
	DO_EV6_MMU,
	DO_DEFAULT_RTC,
	DO_IRONGATE_IO,
	DO_IRONGATE_BUS,
	machine_check:		nautilus_machine_check,
	max_dma_address:	ALPHA_NAUTILUS_MAX_DMA_ADDRESS,
	min_io_address:		DEFAULT_IO_BASE,
	min_mem_address:	IRONGATE_DEFAULT_MEM_BASE,

	nr_irqs:		16,
	device_interrupt:	isa_device_interrupt,

	init_arch:		irongate_init_arch,
	init_irq:		nautilus_init_irq,
	init_rtc:		common_init_rtc,
	init_pci:		nautilus_init_pci,
	kill_arch:		nautilus_kill_arch,
	pci_map_irq:		nautilus_map_irq,
	pci_swizzle:		common_swizzle,
};
ALIAS_MV(nautilus)