setup.c

上传linux-jx2410的源代码

/*
 * setup.c
 *
 * BRIEF MODULE DESCRIPTION
 * Galileo Evaluation Boards - board dependent boot routines
 *
 * Copyright (C) 1996, 1997, 2001  Ralf Baechle
 * Copyright (C) 2000 RidgeRun, Inc.
 * Copyright (C) 2001 Red Hat, Inc.
 *
 * Author: RidgeRun, Inc.
 *   [e-mail], [e-mail], [e-mail]
 *
 * Copyright 2001 MontaVista Software Inc.
 * Author: [e-mail] or [e-mail]
 *
 *  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.
 *
 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the  GNU General Public License along
 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/mc146818rtc.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/timex.h>
#include <linux/vmalloc.h>
#include <asm/time.h>
#include <asm/bootinfo.h>
#include <asm/page.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/pci.h>
#include <asm/processor.h>
#include <asm/ptrace.h>
#include <asm/reboot.h>
#include <asm/mc146818rtc.h>
#include <linux/version.h>
#include <linux/bootmem.h>
#include <linux/blk.h>
#include <asm/gt64120/gt64120.h>
#include "ocelot_pld.h"

extern struct rtc_ops no_rtc_ops;

unsigned long gt64120_base = KSEG1ADDR(GT_DEF_BASE);

/* These functions are used for rebooting or halting the machine*/
extern void momenco_ocelot_restart(char *command);
extern void momenco_ocelot_halt(void);
extern void momenco_ocelot_power_off(void);

extern void gt64120_time_init(void);
extern void momenco_ocelot_irq_setup(void);

static char reset_reason;

#define ENTRYLO(x) ((pte_val(mk_pte_phys((x), PAGE_KERNEL_UNCACHED)) >> 6)|1)

static void __init setup_l3cache(unsigned long size);

void __init momenco_ocelot_setup(void)
{
	void (*l3func)(unsigned long)=KSEG1ADDR(&setup_l3cache);
	unsigned int tmpword;

	board_time_init = gt64120_time_init;

	_machine_restart = momenco_ocelot_restart;
	_machine_halt = momenco_ocelot_halt;
	_machine_power_off = momenco_ocelot_power_off;

	/*
	 * initrd_start = (ulong)ocelot_initrd_start;
	 * initrd_end = (ulong)ocelot_initrd_start + (ulong)ocelot_initrd_size;
	 * initrd_below_start_ok = 1;
	 */
	rtc_ops = &no_rtc_ops;


	/* A wired TLB entry for the GT64120A and the serial port. The
	   GT64120A is going to be hit on every IRQ anyway - there's
	   absolutely no point in letting it be a random TLB entry, as
	   it'll just cause needless churning of the TLB. And we use
	   the other half for the serial port, which is just a PITA
	   otherwise :)

		Device			Physical	Virtual
		GT64120 Internal Regs	0x24000000	0xe0000000
		UARTs (CS2)		0x2d000000	0xe0001000
	*/
	add_wired_entry(ENTRYLO(0x24000000), ENTRYLO(0x2D000000), 0xe0000000, PM_4K);

	/* Also a temporary entry to let us talk to the Ocelot PLD and NVRAM
	   in the CS[012] region. We can't use ioremap() yet. The NVRAM
	   appears to be one of the variants of ST M48T35 - see 
	   http://www.st.com/stonline/bin/sftab.exe?table=172&filter0=M48T35

		Ocelot PLD (CS0)	0x2c000000	0xe0020000
		NVRAM			0x2c800000	0xe0030000
	*/
		
	add_temporary_entry(ENTRYLO(0x2C000000), ENTRYLO(0x2d000000), 0xe0020000, PM_64K);


	/* Relocate the CS3/BootCS region */
  	GT_WRITE( GT_CS3BOOTLD_OFS, 0x2f000000 >> 21);

	/* Relocate CS[012] */
 	GT_WRITE(GT_CS20LD_OFS, 0x2c000000 >> 21);

	/* Relocate the GT64120A itself... */
	GT_WRITE(GT_ISD_OFS, 0x24000000 >> 21);
	mb();
	gt64120_base = 0xe0000000;

	/* ...and the PCI0 view of it. */
	GT_WRITE(GT_PCI0_CFGADDR_OFS, 0x80000020);
	GT_WRITE(GT_PCI0_CFGDATA_OFS, 0x24000000);
	GT_WRITE(GT_PCI0_CFGADDR_OFS, 0x80000024);
	GT_WRITE(GT_PCI0_CFGDATA_OFS, 0x24000001);

	/* Relocate PCI0 I/O and Mem0 */
	GT_WRITE(GT_PCI0IOLD_OFS, 0x20000000 >> 21);
	GT_WRITE(GT_PCI0M0LD_OFS, 0x22000000 >> 21);

	/* Relocate PCI0 Mem1 */
	GT_WRITE(GT_PCI0M1LD_OFS, 0x36000000 >> 21);

	/* Relocate all the PCI1 stuff, not that we use it */
	GT_WRITE(GT_PCI1IOLD_OFS, 0x30000000 >> 21);
	GT_WRITE(GT_PCI1M0LD_OFS, 0x32000000 >> 21);
	GT_WRITE(GT_PCI1M1LD_OFS, 0x34000000 >> 21);

	/* Relocate the CPU's view of the RAM... */
	GT_WRITE(GT_SCS10LD_OFS, 0);
	GT_WRITE(GT_SCS10HD_OFS, 0x0fe00000 >> 21);
	GT_WRITE(GT_SCS32LD_OFS, 0x10000000 >> 21);
	GT_WRITE(GT_SCS32HD_OFS, 0x0fe00000 >> 21);

	GT_WRITE(GT_SCS1LD_OFS, 0xff);
	GT_WRITE(GT_SCS1HD_OFS, 0x00);
	GT_WRITE(GT_SCS0LD_OFS, 0);
	GT_WRITE(GT_SCS0HD_OFS, 0xff);
	GT_WRITE(GT_SCS3LD_OFS, 0xff);
	GT_WRITE(GT_SCS3HD_OFS, 0x00);
	GT_WRITE(GT_SCS2LD_OFS, 0);
	GT_WRITE(GT_SCS2HD_OFS, 0xff);

	/* ...and the PCI0 view of it. */
	GT_WRITE(GT_PCI0_CFGADDR_OFS, 0x80000010);
	GT_WRITE(GT_PCI0_CFGDATA_OFS, 0x00000000);
	GT_WRITE(GT_PCI0_CFGADDR_OFS, 0x80000014);
	GT_WRITE(GT_PCI0_CFGDATA_OFS, 0x10000000);
	GT_WRITE(GT_PCI0_BS_SCS10_OFS, 0x0ffff000);
	GT_WRITE(GT_PCI0_BS_SCS32_OFS, 0x0ffff000);

	tmpword = OCELOT_PLD_READ(BOARDREV);
	if (tmpword < 26)
		printk("Momenco Ocelot: Board Assembly Rev. %c\n", 'A'+tmpword);
	else
		printk("Momenco Ocelot: Board Assembly Revision #0x%x\n", tmpword);

	tmpword = OCELOT_PLD_READ(PLD1_ID);
	printk("PLD 1 ID: %d.%d\n", tmpword>>4, tmpword&15);
	tmpword = OCELOT_PLD_READ(PLD2_ID);
	printk("PLD 2 ID: %d.%d\n", tmpword>>4, tmpword&15);
	tmpword = OCELOT_PLD_READ(RESET_STATUS);
	printk("Reset reason: 0x%x\n", tmpword);
	reset_reason = tmpword;
	OCELOT_PLD_WRITE(0xff, RESET_STATUS);

	tmpword = OCELOT_PLD_READ(BOARD_STATUS);
	printk("Board Status register: 0x%02x\n", tmpword);
	printk("  - User jumper: %s\n", (tmpword & 0x80)?"installed":"absent");
	printk("  - Boot flash write jumper: %s\n", (tmpword&0x40)?"installed":"absent");
	printk("  - Tulip PHY %s connected\n", (tmpword&0x10)?"is":"not");
	printk("  - L3 Cache size: %d MiB\n", (1<<((tmpword&12) >> 2))&~1);
	printk("  - SDRAM size: %d MiB\n", 1<<(6+(tmpword&3)));

	if (tmpword&12)
		l3func((1<<(((tmpword&12) >> 2)+20)));

	switch(tmpword &3) {
	case 3:
		/* 512MiB */
		add_memory_region(256<<20, 256<<20, BOOT_MEM_RAM);
	case 2:
		/* 256MiB */
		/* FIXME: Is it actually here, or at 0x10000000? */
		add_memory_region(128<<20, 128<<20, BOOT_MEM_RAM);
	case 1:
		/* 128MiB */
		add_memory_region(64<<20, 64<<20, BOOT_MEM_RAM);
	case 0:
		/* 64MiB */
		;
	}

	/* Fix up the DiskOnChip mapping */
	GT_WRITE(0x468, 0xfef73);
}

extern int rm7k_tcache_enabled;
/*
 * This runs in KSEG1. See the verbiage in rm7k.c::probe_scache()
 */
#define Page_Invalidate_T 0x16
static void __init setup_l3cache(unsigned long size)
{
	int register i;
	unsigned long tmp;
	
	printk("Enabling L3 cache...");

	/* Enable the L3 cache in the GT64120A's CPU Configuration register */
	GT_READ(0, &tmp);
	GT_WRITE(0, tmp | (1<<14));

	/* Enable the L3 cache in the CPU */
	set_cp0_config(1<<12 /* CONF_TE */);

	/* Clear the cache */
	set_taglo(0);
	set_taghi(0);

	for (i=0; i < size; i+= 4096) {
		__asm__ __volatile__ (
			".set noreorder\n\t"
			".set mips3\n\t"
			"cache %1, (%0)\n\t"
			".set mips0\n\t"
			".set reorder"
			:
			: "r" (KSEG0ADDR(i)),
			  "i" (Page_Invalidate_T));
	}

	/* Let the RM7000 MM code know that the tertiary cache is enabled */
	rm7k_tcache_enabled = 1;

	printk("Done\n");
}


/* This needs to be one of the first initcalls, because no I/O port access
   can work before this */

static int io_base_ioremap(void)
{
	void *io_remap_range = ioremap(GT_PCI_IO_BASE, GT_PCI_IO_SIZE);
	if (!io_remap_range) {
		panic("Could not ioremap I/O port range\n");
	}
	mips_io_port_base = io_remap_range - GT_PCI_IO_BASE;
	return 0;
}
module_init(io_base_ioremap);