blob: 4a9a1edbfb2981bd6f1c178ee371909a8551094a [file] [log] [blame]
Paul Burtoneed0eab2016-10-05 18:18:20 +01001/*
2 * Copyright (C) 2016 Imagination Technologies
3 * Author: Paul Burton <paul.burton@imgtec.com>
4 *
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 */
10
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>
18
19#include <asm/fw/fw.h>
20#include <asm/irq_cpu.h>
21#include <asm/machine.h>
22#include <asm/mips-cpc.h>
23#include <asm/prom.h>
24#include <asm/smp-ops.h>
25#include <asm/time.h>
26
27static __initdata const void *fdt;
28static __initdata const struct mips_machine *mach;
29static __initdata const void *mach_match_data;
30
31void __init prom_init(void)
32{
Matt Redfearn9a590612016-10-17 17:25:24 +010033 plat_get_fdt();
34 BUG_ON(!fdt);
35}
36
37void __init *plat_get_fdt(void)
38{
Paul Burtoneed0eab2016-10-05 18:18:20 +010039 const struct mips_machine *check_mach;
40 const struct of_device_id *match;
41
Matt Redfearn9a590612016-10-17 17:25:24 +010042 if (fdt)
43 /* Already set up */
44 return (void *)fdt;
45
Paul Burtoneed0eab2016-10-05 18:18:20 +010046 if ((fw_arg0 == -2) && !fdt_check_header((void *)fw_arg1)) {
47 /*
48 * We booted using the UHI boot protocol, so we have been
49 * provided with the appropriate device tree for the board.
50 * Make use of it & search for any machine struct based upon
51 * the root compatible string.
52 */
53 fdt = (void *)fw_arg1;
54
55 for_each_mips_machine(check_mach) {
56 match = mips_machine_is_compatible(check_mach, fdt);
57 if (match) {
58 mach = check_mach;
59 mach_match_data = match->data;
60 break;
61 }
62 }
63 } else if (IS_ENABLED(CONFIG_LEGACY_BOARDS)) {
64 /*
65 * We weren't booted using the UHI boot protocol, but do
66 * support some number of boards with legacy boot protocols.
67 * Attempt to find the right one.
68 */
69 for_each_mips_machine(check_mach) {
70 if (!check_mach->detect)
71 continue;
72
73 if (!check_mach->detect())
74 continue;
75
76 mach = check_mach;
77 }
78
79 /*
80 * If we don't recognise the machine then we can't continue, so
81 * die here.
82 */
83 BUG_ON(!mach);
84
85 /* Retrieve the machine's FDT */
86 fdt = mach->fdt;
87 }
Paul Burtoneed0eab2016-10-05 18:18:20 +010088 return (void *)fdt;
89}
90
Marcin Nowakowski0063fde2016-11-23 14:43:47 +010091void __init plat_fdt_relocated(void *new_location)
92{
93 /*
94 * reset fdt as the cached value would point to the location
95 * before relocations happened and update the location argument
96 * if it was passed using UHI
97 */
98 fdt = NULL;
99
100 if (fw_arg0 == -2)
101 fw_arg1 = (unsigned long)new_location;
102}
103
Paul Burtoneed0eab2016-10-05 18:18:20 +0100104void __init plat_mem_setup(void)
105{
106 if (mach && mach->fixup_fdt)
107 fdt = mach->fixup_fdt(fdt, mach_match_data);
108
109 strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
110 __dt_setup_arch((void *)fdt);
111}
112
113void __init device_tree_init(void)
114{
115 int err;
116
117 unflatten_and_copy_device_tree();
118 mips_cpc_probe();
119
120 err = register_cps_smp_ops();
121 if (err)
122 err = register_up_smp_ops();
123}
124
Paul Burtone889dfc2017-06-02 12:29:54 -0700125int __init apply_mips_fdt_fixups(void *fdt_out, size_t fdt_out_size,
126 const void *fdt_in,
127 const struct mips_fdt_fixup *fixups)
128{
129 int err;
130
131 err = fdt_open_into(fdt_in, fdt_out, fdt_out_size);
132 if (err) {
133 pr_err("Failed to open FDT\n");
134 return err;
135 }
136
137 for (; fixups->apply; fixups++) {
138 err = fixups->apply(fdt_out);
139 if (err) {
140 pr_err("Failed to apply FDT fixup \"%s\"\n",
141 fixups->description);
142 return err;
143 }
144 }
145
146 err = fdt_pack(fdt_out);
147 if (err)
148 pr_err("Failed to pack FDT\n");
149 return err;
150}
151
Paul Burtoneed0eab2016-10-05 18:18:20 +0100152void __init plat_time_init(void)
153{
154 struct device_node *np;
155 struct clk *clk;
156
157 of_clk_init(NULL);
158
159 if (!cpu_has_counter) {
160 mips_hpt_frequency = 0;
161 } else if (mach && mach->measure_hpt_freq) {
162 mips_hpt_frequency = mach->measure_hpt_freq();
163 } else {
164 np = of_get_cpu_node(0, NULL);
165 if (!np) {
166 pr_err("Failed to get CPU node\n");
167 return;
168 }
169
170 clk = of_clk_get(np, 0);
171 if (IS_ERR(clk)) {
172 pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
173 return;
174 }
175
176 mips_hpt_frequency = clk_get_rate(clk);
177 clk_put(clk);
178
179 switch (boot_cpu_type()) {
180 case CPU_20KC:
181 case CPU_25KF:
182 /* The counter runs at the CPU clock rate */
183 break;
184 default:
185 /* The counter runs at half the CPU clock rate */
186 mips_hpt_frequency /= 2;
187 break;
188 }
189 }
190
191 clocksource_probe();
192}
193
194void __init arch_init_irq(void)
195{
196 struct device_node *intc_node;
197
198 intc_node = of_find_compatible_node(NULL, NULL,
199 "mti,cpu-interrupt-controller");
200 if (!cpu_has_veic && !intc_node)
201 mips_cpu_irq_init();
202
203 irqchip_init();
204}
205
206static int __init publish_devices(void)
207{
208 if (!of_have_populated_dt())
209 panic("Device-tree not present");
210
211 if (of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL))
212 panic("Failed to populate DT");
213
214 return 0;
215}
216arch_initcall(publish_devices);
217
218void __init prom_free_prom_memory(void)
219{
220}