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
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
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