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 <mporter@kernel.crashing.org>
9 *   Copyright 2002-2005 MontaVista Software Inc.
10 *
11 *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
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
28static 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
34static 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
67static 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
80void 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