xref: /openbmc/linux/arch/powerpc/boot/cuboot-52xx.c (revision eea9507a)
1 /*
2  * Old U-boot compatibility for MPC5200
3  *
4  * Author: Grant Likely <grant.likely@secretlab.ca>
5  *
6  * Copyright (c) 2007 Secret Lab Technologies Ltd.
7  * Copyright (c) 2007 Freescale Semiconductor, Inc.
8  *
9  * This program is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU General Public License version 2 as published
11  * by the Free Software Foundation.
12  */
13 
14 #include "ops.h"
15 #include "stdio.h"
16 #include "io.h"
17 #include "cuboot.h"
18 
19 #define TARGET_PPC_MPC52xx
20 #include "ppcboot.h"
21 
22 static bd_t bd;
23 
24 static void platform_fixups(void)
25 {
26 	void *soc, *reg;
27 	int div;
28 	u32 sysfreq;
29 
30 
31 	dt_fixup_memory(bd.bi_memstart, bd.bi_memsize);
32 	dt_fixup_mac_addresses(bd.bi_enetaddr);
33 	dt_fixup_cpu_clocks(bd.bi_intfreq, bd.bi_busfreq / 4, bd.bi_busfreq);
34 
35 	/* Unfortunately, the specific model number is encoded in the
36 	 * soc node name in existing dts files -- once that is fixed,
37 	 * this can do a simple path lookup.
38 	 */
39 	soc = find_node_by_devtype(NULL, "soc");
40 	if (!soc)
41 		soc = find_node_by_compatible(NULL, "fsl,mpc5200-immr");
42 	if (!soc)
43 		soc = find_node_by_compatible(NULL, "fsl,mpc5200b-immr");
44 	if (soc) {
45 		setprop(soc, "bus-frequency", &bd.bi_ipbfreq,
46 			sizeof(bd.bi_ipbfreq));
47 
48 		if (!dt_xlate_reg(soc, 0, (void*)&reg, NULL))
49 			return;
50 		div = in_8(reg + 0x204) & 0x0020 ? 8 : 4;
51 		sysfreq = bd.bi_busfreq * div;
52 		setprop(soc, "system-frequency", &sysfreq, sizeof(sysfreq));
53 	}
54 }
55 
56 void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
57                    unsigned long r6, unsigned long r7)
58 {
59 	CUBOOT_INIT();
60 	fdt_init(_dtb_start);
61 	serial_console_init();
62 	platform_ops.fixups = platform_fixups;
63 }
64