x86/unwinder: Handle stack overflows more gracefully
[linux/fpc-iii.git] / arch / mips / generic / init.c
blob5ba6fcc26fa726aff50cc3a64315855eb935c1b0
1 /*
2 * Copyright (C) 2016 Imagination Technologies
3 * Author: Paul Burton <paul.burton@mips.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 */
11 #include <linux/clk.h>
12 #include <linux/clk-provider.h>
13 #include <linux/clocksource.h>
14 #include <linux/init.h>
15 #include <linux/irqchip.h>
16 #include <linux/of_fdt.h>
17 #include <linux/of_platform.h>
19 #include <asm/bootinfo.h>
20 #include <asm/fw/fw.h>
21 #include <asm/irq_cpu.h>
22 #include <asm/machine.h>
23 #include <asm/mips-cps.h>
24 #include <asm/prom.h>
25 #include <asm/smp-ops.h>
26 #include <asm/time.h>
28 static __initdata const void *fdt;
29 static __initdata const struct mips_machine *mach;
30 static __initdata const void *mach_match_data;
32 void __init prom_init(void)
34 plat_get_fdt();
35 BUG_ON(!fdt);
38 void __init *plat_get_fdt(void)
40 const struct mips_machine *check_mach;
41 const struct of_device_id *match;
43 if (fdt)
44 /* Already set up */
45 return (void *)fdt;
47 if ((fw_arg0 == -2) && !fdt_check_header((void *)fw_arg1)) {
49 * We booted using the UHI boot protocol, so we have been
50 * provided with the appropriate device tree for the board.
51 * Make use of it & search for any machine struct based upon
52 * the root compatible string.
54 fdt = (void *)fw_arg1;
56 for_each_mips_machine(check_mach) {
57 match = mips_machine_is_compatible(check_mach, fdt);
58 if (match) {
59 mach = check_mach;
60 mach_match_data = match->data;
61 break;
64 } else if (IS_ENABLED(CONFIG_LEGACY_BOARDS)) {
66 * We weren't booted using the UHI boot protocol, but do
67 * support some number of boards with legacy boot protocols.
68 * Attempt to find the right one.
70 for_each_mips_machine(check_mach) {
71 if (!check_mach->detect)
72 continue;
74 if (!check_mach->detect())
75 continue;
77 mach = check_mach;
81 * If we don't recognise the machine then we can't continue, so
82 * die here.
84 BUG_ON(!mach);
86 /* Retrieve the machine's FDT */
87 fdt = mach->fdt;
89 return (void *)fdt;
92 #ifdef CONFIG_RELOCATABLE
94 void __init plat_fdt_relocated(void *new_location)
97 * reset fdt as the cached value would point to the location
98 * before relocations happened and update the location argument
99 * if it was passed using UHI
101 fdt = NULL;
103 if (fw_arg0 == -2)
104 fw_arg1 = (unsigned long)new_location;
107 #endif /* CONFIG_RELOCATABLE */
109 void __init plat_mem_setup(void)
111 if (mach && mach->fixup_fdt)
112 fdt = mach->fixup_fdt(fdt, mach_match_data);
114 strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
115 __dt_setup_arch((void *)fdt);
118 void __init device_tree_init(void)
120 int err;
122 unflatten_and_copy_device_tree();
123 mips_cpc_probe();
125 err = register_cps_smp_ops();
126 if (err)
127 err = register_up_smp_ops();
130 int __init apply_mips_fdt_fixups(void *fdt_out, size_t fdt_out_size,
131 const void *fdt_in,
132 const struct mips_fdt_fixup *fixups)
134 int err;
136 err = fdt_open_into(fdt_in, fdt_out, fdt_out_size);
137 if (err) {
138 pr_err("Failed to open FDT\n");
139 return err;
142 for (; fixups->apply; fixups++) {
143 err = fixups->apply(fdt_out);
144 if (err) {
145 pr_err("Failed to apply FDT fixup \"%s\"\n",
146 fixups->description);
147 return err;
151 err = fdt_pack(fdt_out);
152 if (err)
153 pr_err("Failed to pack FDT\n");
154 return err;
157 void __init plat_time_init(void)
159 struct device_node *np;
160 struct clk *clk;
162 of_clk_init(NULL);
164 if (!cpu_has_counter) {
165 mips_hpt_frequency = 0;
166 } else if (mach && mach->measure_hpt_freq) {
167 mips_hpt_frequency = mach->measure_hpt_freq();
168 } else {
169 np = of_get_cpu_node(0, NULL);
170 if (!np) {
171 pr_err("Failed to get CPU node\n");
172 return;
175 clk = of_clk_get(np, 0);
176 if (IS_ERR(clk)) {
177 pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
178 return;
181 mips_hpt_frequency = clk_get_rate(clk);
182 clk_put(clk);
184 switch (boot_cpu_type()) {
185 case CPU_20KC:
186 case CPU_25KF:
187 /* The counter runs at the CPU clock rate */
188 break;
189 default:
190 /* The counter runs at half the CPU clock rate */
191 mips_hpt_frequency /= 2;
192 break;
196 timer_probe();
199 void __init arch_init_irq(void)
201 struct device_node *intc_node;
203 intc_node = of_find_compatible_node(NULL, NULL,
204 "mti,cpu-interrupt-controller");
205 if (!cpu_has_veic && !intc_node)
206 mips_cpu_irq_init();
208 irqchip_init();
211 static int __init publish_devices(void)
213 if (!of_have_populated_dt())
214 panic("Device-tree not present");
216 if (of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL))
217 panic("Failed to populate DT");
219 return 0;
221 arch_initcall(publish_devices);
223 void __init prom_free_prom_memory(void)