File: init.c

package info (click to toggle)
linux 4.19.37-3
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 962,264 kB
  • sloc: ansic: 16,757,120; asm: 271,404; makefile: 38,285; sh: 33,529; perl: 27,681; python: 21,031; cpp: 5,063; yacc: 4,648; lex: 2,585; awk: 1,385; ruby: 25; sed: 5
file content (213 lines) | stat: -rw-r--r-- 4,522 bytes parent folder | download | duplicates (7)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
/*
 * Copyright (C) 2016 Imagination Technologies
 * Author: Paul Burton <paul.burton@mips.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/clocksource.h>
#include <linux/init.h>
#include <linux/irqchip.h>
#include <linux/of_fdt.h>

#include <asm/bootinfo.h>
#include <asm/fw/fw.h>
#include <asm/irq_cpu.h>
#include <asm/machine.h>
#include <asm/mips-cps.h>
#include <asm/prom.h>
#include <asm/smp-ops.h>
#include <asm/time.h>

static __initdata const void *fdt;
static __initdata const struct mips_machine *mach;
static __initdata const void *mach_match_data;

void __init prom_init(void)
{
	plat_get_fdt();
	BUG_ON(!fdt);
}

void __init *plat_get_fdt(void)
{
	const struct mips_machine *check_mach;
	const struct of_device_id *match;

	if (fdt)
		/* Already set up */
		return (void *)fdt;

	if ((fw_arg0 == -2) && !fdt_check_header((void *)fw_arg1)) {
		/*
		 * We booted using the UHI boot protocol, so we have been
		 * provided with the appropriate device tree for the board.
		 * Make use of it & search for any machine struct based upon
		 * the root compatible string.
		 */
		fdt = (void *)fw_arg1;

		for_each_mips_machine(check_mach) {
			match = mips_machine_is_compatible(check_mach, fdt);
			if (match) {
				mach = check_mach;
				mach_match_data = match->data;
				break;
			}
		}
	} else if (IS_ENABLED(CONFIG_LEGACY_BOARDS)) {
		/*
		 * We weren't booted using the UHI boot protocol, but do
		 * support some number of boards with legacy boot protocols.
		 * Attempt to find the right one.
		 */
		for_each_mips_machine(check_mach) {
			if (!check_mach->detect)
				continue;

			if (!check_mach->detect())
				continue;

			mach = check_mach;
		}

		/*
		 * If we don't recognise the machine then we can't continue, so
		 * die here.
		 */
		BUG_ON(!mach);

		/* Retrieve the machine's FDT */
		fdt = mach->fdt;
	}
	return (void *)fdt;
}

#ifdef CONFIG_RELOCATABLE

void __init plat_fdt_relocated(void *new_location)
{
	/*
	 * reset fdt as the cached value would point to the location
	 * before relocations happened and update the location argument
	 * if it was passed using UHI
	 */
	fdt = NULL;

	if (fw_arg0 == -2)
		fw_arg1 = (unsigned long)new_location;
}

#endif /* CONFIG_RELOCATABLE */

void __init plat_mem_setup(void)
{
	if (mach && mach->fixup_fdt)
		fdt = mach->fixup_fdt(fdt, mach_match_data);

	strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
	__dt_setup_arch((void *)fdt);
}

void __init device_tree_init(void)
{
	int err;

	unflatten_and_copy_device_tree();
	mips_cpc_probe();

	err = register_cps_smp_ops();
	if (err)
		err = register_up_smp_ops();
}

int __init apply_mips_fdt_fixups(void *fdt_out, size_t fdt_out_size,
				 const void *fdt_in,
				 const struct mips_fdt_fixup *fixups)
{
	int err;

	err = fdt_open_into(fdt_in, fdt_out, fdt_out_size);
	if (err) {
		pr_err("Failed to open FDT\n");
		return err;
	}

	for (; fixups->apply; fixups++) {
		err = fixups->apply(fdt_out);
		if (err) {
			pr_err("Failed to apply FDT fixup \"%s\"\n",
			       fixups->description);
			return err;
		}
	}

	err = fdt_pack(fdt_out);
	if (err)
		pr_err("Failed to pack FDT\n");
	return err;
}

void __init plat_time_init(void)
{
	struct device_node *np;
	struct clk *clk;

	of_clk_init(NULL);

	if (!cpu_has_counter) {
		mips_hpt_frequency = 0;
	} else if (mach && mach->measure_hpt_freq) {
		mips_hpt_frequency = mach->measure_hpt_freq();
	} else {
		np = of_get_cpu_node(0, NULL);
		if (!np) {
			pr_err("Failed to get CPU node\n");
			return;
		}

		clk = of_clk_get(np, 0);
		if (IS_ERR(clk)) {
			pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
			return;
		}

		mips_hpt_frequency = clk_get_rate(clk);
		clk_put(clk);

		switch (boot_cpu_type()) {
		case CPU_20KC:
		case CPU_25KF:
			/* The counter runs at the CPU clock rate */
			break;
		default:
			/* The counter runs at half the CPU clock rate */
			mips_hpt_frequency /= 2;
			break;
		}
	}

	timer_probe();
}

void __init arch_init_irq(void)
{
	struct device_node *intc_node;

	intc_node = of_find_compatible_node(NULL, NULL,
					    "mti,cpu-interrupt-controller");
	if (!cpu_has_veic && !intc_node)
		mips_cpu_irq_init();
	of_node_put(intc_node);

	irqchip_init();
}

void __init prom_free_prom_memory(void)
{
}