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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2016 Imagination Technologies
4 * Author: Paul Burton <paul.burton@mips.com>
5 */
6
7#include <linux/clk.h>
8#include <linux/clocksource.h>
9#include <linux/init.h>
10#include <linux/irqchip.h>
11#include <linux/of_clk.h>
12#include <linux/of_fdt.h>
13
14#include <asm/bootinfo.h>
15#include <asm/fw/fw.h>
16#include <asm/irq_cpu.h>
17#include <asm/machine.h>
18#include <asm/mips-cps.h>
19#include <asm/prom.h>
20#include <asm/smp-ops.h>
21#include <asm/time.h>
22
23static __initconst const void *fdt;
24static __initconst const struct mips_machine *mach;
25static __initconst const void *mach_match_data;
26
27void __init prom_init(void)
28{
29 plat_get_fdt();
30 BUG_ON(!fdt);
31}
32
33void __init *plat_get_fdt(void)
34{
35 const struct mips_machine *check_mach;
36 const struct of_device_id *match;
37
38 if (fdt)
39 /* Already set up */
40 return (void *)fdt;
41
42 fdt = (void *)get_fdt();
43 if (fdt && !fdt_check_header(fdt)) {
44 /*
45 * We have been provided with the appropriate device tree for
46 * the board. Make use of it & search for any machine struct
47 * based upon the root compatible string.
48 */
49 for_each_mips_machine(check_mach) {
50 match = mips_machine_is_compatible(check_mach, fdt);
51 if (match) {
52 mach = check_mach;
53 mach_match_data = match->data;
54 break;
55 }
56 }
57 } else if (IS_ENABLED(CONFIG_LEGACY_BOARDS)) {
58 /*
59 * We weren't booted using the UHI boot protocol, but do
60 * support some number of boards with legacy boot protocols.
61 * Attempt to find the right one.
62 */
63 for_each_mips_machine(check_mach) {
64 if (!check_mach->detect)
65 continue;
66
67 if (!check_mach->detect())
68 continue;
69
70 mach = check_mach;
71 }
72
73 /*
74 * If we don't recognise the machine then we can't continue, so
75 * die here.
76 */
77 BUG_ON(!mach);
78
79 /* Retrieve the machine's FDT */
80 fdt = mach->fdt;
81 }
82 return (void *)fdt;
83}
84
85#ifdef CONFIG_RELOCATABLE
86
87void __init plat_fdt_relocated(void *new_location)
88{
89 /*
90 * reset fdt as the cached value would point to the location
91 * before relocations happened and update the location argument
92 * if it was passed using UHI
93 */
94 fdt = NULL;
95
96 if (fw_arg0 == -2)
97 fw_arg1 = (unsigned long)new_location;
98}
99
100#endif /* CONFIG_RELOCATABLE */
101
102void __init plat_mem_setup(void)
103{
104 if (mach && mach->fixup_fdt)
105 fdt = mach->fixup_fdt(fdt, mach_match_data);
106
107 fw_init_cmdline();
108 __dt_setup_arch((void *)fdt);
109}
110
111void __init device_tree_init(void)
112{
113 unflatten_and_copy_device_tree();
114 mips_cpc_probe();
115
116 if (!register_cps_smp_ops())
117 return;
118 if (!register_vsmp_smp_ops())
119 return;
120
121 register_up_smp_ops();
122}
123
124int __init apply_mips_fdt_fixups(void *fdt_out, size_t fdt_out_size,
125 const void *fdt_in,
126 const struct mips_fdt_fixup *fixups)
127{
128 int err;
129
130 err = fdt_open_into(fdt_in, fdt_out, fdt_out_size);
131 if (err) {
132 pr_err("Failed to open FDT\n");
133 return err;
134 }
135
136 for (; fixups->apply; fixups++) {
137 err = fixups->apply(fdt_out);
138 if (err) {
139 pr_err("Failed to apply FDT fixup \"%s\"\n",
140 fixups->description);
141 return err;
142 }
143 }
144
145 err = fdt_pack(fdt_out);
146 if (err)
147 pr_err("Failed to pack FDT\n");
148 return err;
149}
150
151void __init plat_time_init(void)
152{
153 struct device_node *np;
154 struct clk *clk;
155
156 of_clk_init(NULL);
157
158 if (!cpu_has_counter) {
159 mips_hpt_frequency = 0;
160 } else if (mach && mach->measure_hpt_freq) {
161 mips_hpt_frequency = mach->measure_hpt_freq();
162 } else {
163 np = of_get_cpu_node(0, NULL);
164 if (!np) {
165 pr_err("Failed to get CPU node\n");
166 return;
167 }
168
169 clk = of_clk_get(np, 0);
170 if (IS_ERR(clk)) {
171 pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
172 return;
173 }
174
175 mips_hpt_frequency = clk_get_rate(clk);
176 clk_put(clk);
177
178 switch (boot_cpu_type()) {
179 case CPU_20KC:
180 case CPU_25KF:
181 /* The counter runs at the CPU clock rate */
182 break;
183 default:
184 /* The counter runs at half the CPU clock rate */
185 mips_hpt_frequency /= 2;
186 break;
187 }
188 }
189
190 timer_probe();
191}
192
193void __init arch_init_irq(void)
194{
195 struct device_node *intc_node;
196
197 intc_node = of_find_compatible_node(NULL, NULL,
198 "mti,cpu-interrupt-controller");
199 if (!cpu_has_veic && !intc_node)
200 mips_cpu_irq_init();
201 of_node_put(intc_node);
202
203 irqchip_init();
204}
1/*
2 * Copyright (C) 2016 Imagination Technologies
3 * Author: Paul Burton <paul.burton@mips.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/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>
27
28static __initdata const void *fdt;
29static __initdata const struct mips_machine *mach;
30static __initdata const void *mach_match_data;
31
32void __init prom_init(void)
33{
34 plat_get_fdt();
35 BUG_ON(!fdt);
36}
37
38void __init *plat_get_fdt(void)
39{
40 const struct mips_machine *check_mach;
41 const struct of_device_id *match;
42
43 if (fdt)
44 /* Already set up */
45 return (void *)fdt;
46
47 if ((fw_arg0 == -2) && !fdt_check_header((void *)fw_arg1)) {
48 /*
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.
53 */
54 fdt = (void *)fw_arg1;
55
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;
62 }
63 }
64 } else if (IS_ENABLED(CONFIG_LEGACY_BOARDS)) {
65 /*
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.
69 */
70 for_each_mips_machine(check_mach) {
71 if (!check_mach->detect)
72 continue;
73
74 if (!check_mach->detect())
75 continue;
76
77 mach = check_mach;
78 }
79
80 /*
81 * If we don't recognise the machine then we can't continue, so
82 * die here.
83 */
84 BUG_ON(!mach);
85
86 /* Retrieve the machine's FDT */
87 fdt = mach->fdt;
88 }
89 return (void *)fdt;
90}
91
92#ifdef CONFIG_RELOCATABLE
93
94void __init plat_fdt_relocated(void *new_location)
95{
96 /*
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
100 */
101 fdt = NULL;
102
103 if (fw_arg0 == -2)
104 fw_arg1 = (unsigned long)new_location;
105}
106
107#endif /* CONFIG_RELOCATABLE */
108
109void __init plat_mem_setup(void)
110{
111 if (mach && mach->fixup_fdt)
112 fdt = mach->fixup_fdt(fdt, mach_match_data);
113
114 strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
115 __dt_setup_arch((void *)fdt);
116}
117
118void __init device_tree_init(void)
119{
120 int err;
121
122 unflatten_and_copy_device_tree();
123 mips_cpc_probe();
124
125 err = register_cps_smp_ops();
126 if (err)
127 err = register_up_smp_ops();
128}
129
130int __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)
133{
134 int err;
135
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;
140 }
141
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;
148 }
149 }
150
151 err = fdt_pack(fdt_out);
152 if (err)
153 pr_err("Failed to pack FDT\n");
154 return err;
155}
156
157void __init plat_time_init(void)
158{
159 struct device_node *np;
160 struct clk *clk;
161
162 of_clk_init(NULL);
163
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;
173 }
174
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;
179 }
180
181 mips_hpt_frequency = clk_get_rate(clk);
182 clk_put(clk);
183
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;
193 }
194 }
195
196 timer_probe();
197}
198
199void __init arch_init_irq(void)
200{
201 struct device_node *intc_node;
202
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();
207
208 irqchip_init();
209}
210
211static int __init publish_devices(void)
212{
213 if (!of_have_populated_dt())
214 panic("Device-tree not present");
215
216 if (of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL))
217 panic("Failed to populate DT");
218
219 return 0;
220}
221arch_initcall(publish_devices);
222
223void __init prom_free_prom_memory(void)
224{
225}