Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/powerpc/boot/ebony.c
26439 views
1
// SPDX-License-Identifier: GPL-2.0-or-later

2
/*

3
 * Copyright 2007 David Gibson, IBM Corporation.

4
 *

5
 * Based on earlier code:

6
 *   Copyright (C) Paul Mackerras 1997.

7
 *

8
 *   Matt Porter <[email protected]>

9
 *   Copyright 2002-2005 MontaVista Software Inc.

10
 *

11
 *   Eugene Surovegin <[email protected]> or <[email protected]>

12
 *   Copyright (c) 2003, 2004 Zultys Technologies

13
 */

14
#include <stdarg.h>

15
#include <stddef.h>

16
#include "types.h"

17
#include "elf.h"

18
#include "string.h"

19
#include "stdio.h"

20
#include "page.h"

21
#include "ops.h"

22
#include "reg.h"

23
#include "io.h"

24
#include "dcr.h"

25
#include "4xx.h"

26
#include "44x.h"

27


28
static u8 *ebony_mac0, *ebony_mac1;

29


30
#define EBONY_FPGA_PATH		"/plb/opb/ebc/fpga"

31
#define	EBONY_FPGA_FLASH_SEL	0x01

32
#define EBONY_SMALL_FLASH_PATH	"/plb/opb/ebc/small-flash"

33


34
static void ebony_flashsel_fixup(void)

35
{

36
	void *devp;

37
	u32 reg[3] = {0x0, 0x0, 0x80000};

38
	u8 *fpga;

39
	u8 fpga_reg0 = 0x0;

40


41
	devp = finddevice(EBONY_FPGA_PATH);

42
	if (!devp)

43
		fatal("Couldn't locate FPGA node %s\n\r", EBONY_FPGA_PATH);

44


45
	if (getprop(devp, "virtual-reg", &fpga, sizeof(fpga)) != sizeof(fpga))

46
		fatal("%s has missing or invalid virtual-reg property\n\r",

47
		      EBONY_FPGA_PATH);

48


49
	fpga_reg0 = in_8(fpga);

50


51
	devp = finddevice(EBONY_SMALL_FLASH_PATH);

52
	if (!devp)

53
		fatal("Couldn't locate small flash node %s\n\r",

54
		      EBONY_SMALL_FLASH_PATH);

55


56
	if (getprop(devp, "reg", reg, sizeof(reg)) != sizeof(reg))

57
		fatal("%s has reg property of unexpected size\n\r",

58
		      EBONY_SMALL_FLASH_PATH);

59


60
	/* Invert address bit 14 (IBM-endian) if FLASH_SEL fpga bit is set */

61
	if (fpga_reg0 & EBONY_FPGA_FLASH_SEL)

62
		reg[1] ^= 0x80000;

63


64
	setprop(devp, "reg", reg, sizeof(reg));

65
}

66


67
static void ebony_fixups(void)

68
{

69
	// FIXME: sysclk should be derived by reading the FPGA registers

70
	unsigned long sysclk = 33000000;

71


72
	ibm440gp_fixup_clocks(sysclk, 6 * 1843200);

73
	ibm4xx_sdram_fixup_memsize();

74
	dt_fixup_mac_address_by_alias("ethernet0", ebony_mac0);

75
	dt_fixup_mac_address_by_alias("ethernet1", ebony_mac1);

76
	ibm4xx_fixup_ebc_ranges("/plb/opb/ebc");

77
	ebony_flashsel_fixup();

78
}

79


80
void ebony_init(void *mac0, void *mac1)

81
{

82
	platform_ops.fixups = ebony_fixups;

83
	platform_ops.exit = ibm44x_dbcr_reset;

84
	ebony_mac0 = mac0;

85
	ebony_mac1 = mac1;

86
	fdt_init(_dtb_start);

87
	serial_console_init();

88
}

89


90