blob: 0ea73e84544048d7c121102dbd4da8000edb3e61 [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{
33 const struct mips_machine *check_mach;
34 const struct of_device_id *match;
35
36 if ((fw_arg0 == -2) && !fdt_check_header((void *)fw_arg1)) {
37 /*
38 * We booted using the UHI boot protocol, so we have been
39 * provided with the appropriate device tree for the board.
40 * Make use of it & search for any machine struct based upon
41 * the root compatible string.
42 */
43 fdt = (void *)fw_arg1;
44
45 for_each_mips_machine(check_mach) {
46 match = mips_machine_is_compatible(check_mach, fdt);
47 if (match) {
48 mach = check_mach;
49 mach_match_data = match->data;
50 break;
51 }
52 }
53 } else if (IS_ENABLED(CONFIG_LEGACY_BOARDS)) {
54 /*
55 * We weren't booted using the UHI boot protocol, but do
56 * support some number of boards with legacy boot protocols.
57 * Attempt to find the right one.
58 */
59 for_each_mips_machine(check_mach) {
60 if (!check_mach->detect)
61 continue;
62
63 if (!check_mach->detect())
64 continue;
65
66 mach = check_mach;
67 }
68
69 /*
70 * If we don't recognise the machine then we can't continue, so
71 * die here.
72 */
73 BUG_ON(!mach);
74
75 /* Retrieve the machine's FDT */
76 fdt = mach->fdt;
77 }
78
79 BUG_ON(!fdt);
80}
81
82void __init *plat_get_fdt(void)
83{
84 return (void *)fdt;
85}
86
87void __init plat_mem_setup(void)
88{
89 if (mach && mach->fixup_fdt)
90 fdt = mach->fixup_fdt(fdt, mach_match_data);
91
92 strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
93 __dt_setup_arch((void *)fdt);
94}
95
96void __init device_tree_init(void)
97{
98 int err;
99
100 unflatten_and_copy_device_tree();
101 mips_cpc_probe();
102
103 err = register_cps_smp_ops();
104 if (err)
105 err = register_up_smp_ops();
106}
107
108void __init plat_time_init(void)
109{
110 struct device_node *np;
111 struct clk *clk;
112
113 of_clk_init(NULL);
114
115 if (!cpu_has_counter) {
116 mips_hpt_frequency = 0;
117 } else if (mach && mach->measure_hpt_freq) {
118 mips_hpt_frequency = mach->measure_hpt_freq();
119 } else {
120 np = of_get_cpu_node(0, NULL);
121 if (!np) {
122 pr_err("Failed to get CPU node\n");
123 return;
124 }
125
126 clk = of_clk_get(np, 0);
127 if (IS_ERR(clk)) {
128 pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
129 return;
130 }
131
132 mips_hpt_frequency = clk_get_rate(clk);
133 clk_put(clk);
134
135 switch (boot_cpu_type()) {
136 case CPU_20KC:
137 case CPU_25KF:
138 /* The counter runs at the CPU clock rate */
139 break;
140 default:
141 /* The counter runs at half the CPU clock rate */
142 mips_hpt_frequency /= 2;
143 break;
144 }
145 }
146
147 clocksource_probe();
148}
149
150void __init arch_init_irq(void)
151{
152 struct device_node *intc_node;
153
154 intc_node = of_find_compatible_node(NULL, NULL,
155 "mti,cpu-interrupt-controller");
156 if (!cpu_has_veic && !intc_node)
157 mips_cpu_irq_init();
158
159 irqchip_init();
160}
161
162static int __init publish_devices(void)
163{
164 if (!of_have_populated_dt())
165 panic("Device-tree not present");
166
167 if (of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL))
168 panic("Failed to populate DT");
169
170 return 0;
171}
172arch_initcall(publish_devices);
173
174void __init prom_free_prom_memory(void)
175{
176}