1 /*
2  * Copyright © 2011 Tony Breeds IBM Corporation
3  *
4  * Based on earlier code:
5  *   Copyright (C) Paul Mackerras 1997.
6  *
7  *   Matt Porter <mporter@kernel.crashing.org>
8  *   Copyright 2002-2005 MontaVista Software Inc.
9  *
10  *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
11  *   Copyright (c) 2003, 2004 Zultys Technologies
12  *
13  *    Copyright 2007 David Gibson, IBM Corporation.
14  *    Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
15  *    Copyright © 2011 David Kleikamp IBM Corporation
16  *
17  * This program is free software; you can redistribute it and/or
18  * modify it under the terms of the GNU General Public License
19  * as published by the Free Software Foundation; either version
20  * 2 of the License, or (at your option) any later version.
21  */
22 #include <stdarg.h>
23 #include <stddef.h>
24 #include "types.h"
25 #include "elf.h"
26 #include "string.h"
27 #include "stdio.h"
28 #include "page.h"
29 #include "ops.h"
30 #include "reg.h"
31 #include "io.h"
32 #include "dcr.h"
33 #include "4xx.h"
34 #include "44x.h"
35 #include "libfdt.h"
36 
37 BSS_STACK(4096);
38 
39 #define MAX_RANKS	0x4
40 #define DDR3_MR0CF	0x80010011U
41 
42 static unsigned long long ibm_currituck_memsize;
43 static unsigned long long ibm_currituck_detect_memsize(void)
44 {
45 	u32 reg;
46 	unsigned i;
47 	unsigned long long memsize = 0;
48 
49 	for(i = 0; i < MAX_RANKS; i++){
50 		reg = mfdcrx(DDR3_MR0CF + i);
51 
52 		if (!(reg & 1))
53 			continue;
54 
55 		reg &= 0x0000f000;
56 		reg >>= 12;
57 		memsize += (0x800000ULL << reg);
58 	}
59 
60 	return memsize;
61 }
62 
63 static void ibm_currituck_fixups(void)
64 {
65 	void *devp = finddevice("/");
66 	u32 dma_ranges[7];
67 
68 	dt_fixup_memory(0x0ULL,  ibm_currituck_memsize);
69 
70 	while ((devp = find_node_by_devtype(devp, "pci"))) {
71 		if (getprop(devp, "dma-ranges", dma_ranges, sizeof(dma_ranges)) < 0) {
72 			printf("%s: Failed to get dma-ranges\r\n", __func__);
73 			continue;
74 		}
75 
76 		dma_ranges[5] = ibm_currituck_memsize >> 32;
77 		dma_ranges[6] = ibm_currituck_memsize & 0xffffffffUL;
78 
79 		setprop(devp, "dma-ranges", dma_ranges, sizeof(dma_ranges));
80 	}
81 }
82 
83 #define SPRN_PIR	0x11E	/* Processor Indentification Register */
84 void platform_init(void)
85 {
86 	unsigned long end_of_ram, avail_ram;
87 	u32 pir_reg;
88 	int node, size;
89 	const u32 *timebase;
90 
91 	ibm_currituck_memsize = ibm_currituck_detect_memsize();
92 	if (ibm_currituck_memsize >> 32)
93 		end_of_ram = ~0UL;
94 	else
95 		end_of_ram = ibm_currituck_memsize;
96 	avail_ram = end_of_ram - (unsigned long)_end;
97 
98 	simple_alloc_init(_end, avail_ram, 128, 64);
99 	platform_ops.fixups = ibm_currituck_fixups;
100 	platform_ops.exit = ibm44x_dbcr_reset;
101 	pir_reg = mfspr(SPRN_PIR);
102 
103 	/* Make sure FDT blob is sane */
104 	if (fdt_check_header(_dtb_start) != 0)
105 		fatal("Invalid device tree blob\n");
106 
107 	node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
108 	                                     "cpu", sizeof("cpu"));
109 	if (!node)
110 		fatal("Cannot find cpu node\n");
111 	timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
112 	if (timebase && (size == 4))
113 		timebase_period_ns = 1000000000 / *timebase;
114 
115 	fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
116 	fdt_init(_dtb_start);
117 
118 	serial_console_init();
119 }
120