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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/powerpc/boot/ebony.c
10818 views
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/*

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 * Copyright 2007 David Gibson, IBM Corporation.

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 *

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 * Based on earlier code:

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 *   Copyright (C) Paul Mackerras 1997.

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 *

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 *   Matt Porter <[email protected]>

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 *   Copyright 2002-2005 MontaVista Software Inc.

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 *

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 *   Eugene Surovegin <[email protected]> or <[email protected]>

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 *   Copyright (c) 2003, 2004 Zultys Technologies

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 *

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 * This program is free software; you can redistribute it and/or

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 * modify it under the terms of the GNU General Public License

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 * as published by the Free Software Foundation; either version

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 * 2 of the License, or (at your option) any later version.

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 */

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#include <stdarg.h>

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#include <stddef.h>

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#include "types.h"

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#include "elf.h"

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#include "string.h"

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#include "stdio.h"

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#include "page.h"

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#include "ops.h"

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#include "reg.h"

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#include "io.h"

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#include "dcr.h"

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#include "4xx.h"

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#include "44x.h"

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static u8 *ebony_mac0, *ebony_mac1;

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#define EBONY_FPGA_PATH		"/plb/opb/ebc/fpga"

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#define	EBONY_FPGA_FLASH_SEL	0x01

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#define EBONY_SMALL_FLASH_PATH	"/plb/opb/ebc/small-flash"

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static void ebony_flashsel_fixup(void)

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{

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	void *devp;

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	u32 reg[3] = {0x0, 0x0, 0x80000};

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	u8 *fpga;

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	u8 fpga_reg0 = 0x0;

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	devp = finddevice(EBONY_FPGA_PATH);

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	if (!devp)

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		fatal("Couldn't locate FPGA node %s\n\r", EBONY_FPGA_PATH);

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	if (getprop(devp, "virtual-reg", &fpga, sizeof(fpga)) != sizeof(fpga))

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		fatal("%s has missing or invalid virtual-reg property\n\r",

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		      EBONY_FPGA_PATH);

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	fpga_reg0 = in_8(fpga);

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	devp = finddevice(EBONY_SMALL_FLASH_PATH);

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	if (!devp)

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		fatal("Couldn't locate small flash node %s\n\r",

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		      EBONY_SMALL_FLASH_PATH);

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	if (getprop(devp, "reg", reg, sizeof(reg)) != sizeof(reg))

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		fatal("%s has reg property of unexpected size\n\r",

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		      EBONY_SMALL_FLASH_PATH);

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	/* Invert address bit 14 (IBM-endian) if FLASH_SEL fpga bit is set */

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	if (fpga_reg0 & EBONY_FPGA_FLASH_SEL)

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		reg[1] ^= 0x80000;

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	setprop(devp, "reg", reg, sizeof(reg));

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}

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static void ebony_fixups(void)

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{

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	// FIXME: sysclk should be derived by reading the FPGA registers

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	unsigned long sysclk = 33000000;

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	ibm440gp_fixup_clocks(sysclk, 6 * 1843200);

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	ibm4xx_sdram_fixup_memsize();

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	dt_fixup_mac_address_by_alias("ethernet0", ebony_mac0);

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	dt_fixup_mac_address_by_alias("ethernet1", ebony_mac1);

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	ibm4xx_fixup_ebc_ranges("/plb/opb/ebc");

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	ebony_flashsel_fixup();

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}

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void ebony_init(void *mac0, void *mac1)

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{

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	platform_ops.fixups = ebony_fixups;

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	platform_ops.exit = ibm44x_dbcr_reset;

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	ebony_mac0 = mac0;

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	ebony_mac1 = mac1;

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	fdt_init(_dtb_start);

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	serial_console_init();

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}

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