1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Old U-boot compatibility for Walnut
 4 *
 5 * Author: Josh Boyer <jwboyer@linux.vnet.ibm.com>
 6 *
 7 * Copyright 2007 IBM Corporation
 8 *   Based on cuboot-83xx.c, which is:
 9 * Copyright (c) 2007 Freescale Semiconductor, Inc.
10 */
11
12#include "ops.h"
13#include "stdio.h"
14#include "dcr.h"
15#include "4xx.h"
16#include "io.h"
17
18BSS_STACK(4096);
19
20static void walnut_flashsel_fixup(void)
21{
22	void *devp, *sram;
23	u32 reg_flash[3] = {0x0, 0x0, 0x80000};
24	u32 reg_sram[3] = {0x0, 0x0, 0x80000};
25	u8 *fpga;
26	u8 fpga_brds1 = 0x0;
27
28	devp = finddevice("/plb/ebc/fpga");
29	if (!devp)
30		fatal("Couldn't locate FPGA node\n\r");
31
32	if (getprop(devp, "virtual-reg", &fpga, sizeof(fpga)) != sizeof(fpga))
33		fatal("no virtual-reg property\n\r");
34
35	fpga_brds1 = in_8(fpga);
36
37	devp = finddevice("/plb/ebc/flash");
38	if (!devp)
39		fatal("Couldn't locate flash node\n\r");
40
41	if (getprop(devp, "reg", reg_flash, sizeof(reg_flash)) != sizeof(reg_flash))
42		fatal("flash reg property has unexpected size\n\r");
43
44	sram = finddevice("/plb/ebc/sram");
45	if (!sram)
46		fatal("Couldn't locate sram node\n\r");
47
48	if (getprop(sram, "reg", reg_sram, sizeof(reg_sram)) != sizeof(reg_sram))
49		fatal("sram reg property has unexpected size\n\r");
50
51	if (fpga_brds1 & 0x1) {
52		reg_flash[1] ^= 0x80000;
53		reg_sram[1] ^= 0x80000;
54	}
55
56	setprop(devp, "reg", reg_flash, sizeof(reg_flash));
57	setprop(sram, "reg", reg_sram, sizeof(reg_sram));
58}
59
60#define WALNUT_OPENBIOS_MAC_OFF 0xfffffe0b
61static void walnut_fixups(void)
62{
63	ibm4xx_sdram_fixup_memsize();
64	ibm405gp_fixup_clocks(33330000, 0xa8c000);
65	ibm4xx_quiesce_eth((u32 *)0xef600800, NULL);
66	ibm4xx_fixup_ebc_ranges("/plb/ebc");
67	walnut_flashsel_fixup();
68	dt_fixup_mac_address_by_alias("ethernet0", (u8 *) WALNUT_OPENBIOS_MAC_OFF);
69}
70
71void platform_init(void)
72{
73	unsigned long end_of_ram = 0x2000000;
74	unsigned long avail_ram = end_of_ram - (unsigned long) _end;
75
76	simple_alloc_init(_end, avail_ram, 32, 32);
77	platform_ops.fixups = walnut_fixups;
78	platform_ops.exit = ibm40x_dbcr_reset;
79	fdt_init(_dtb_start);
80	serial_console_init();
81}