Loading...
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}
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 if ((fw_arg0 == -2) && !fdt_check_header((void *)fw_passed_dtb)) {
43 /*
44 * We booted using the UHI boot protocol, so we have been
45 * provided with the appropriate device tree for the board.
46 * Make use of it & search for any machine struct based upon
47 * the root compatible string.
48 */
49 fdt = (void *)fw_passed_dtb;
50
51 for_each_mips_machine(check_mach) {
52 match = mips_machine_is_compatible(check_mach, fdt);
53 if (match) {
54 mach = check_mach;
55 mach_match_data = match->data;
56 break;
57 }
58 }
59 } else if (IS_ENABLED(CONFIG_LEGACY_BOARDS)) {
60 /*
61 * We weren't booted using the UHI boot protocol, but do
62 * support some number of boards with legacy boot protocols.
63 * Attempt to find the right one.
64 */
65 for_each_mips_machine(check_mach) {
66 if (!check_mach->detect)
67 continue;
68
69 if (!check_mach->detect())
70 continue;
71
72 mach = check_mach;
73 }
74
75 /*
76 * If we don't recognise the machine then we can't continue, so
77 * die here.
78 */
79 BUG_ON(!mach);
80
81 /* Retrieve the machine's FDT */
82 fdt = mach->fdt;
83 }
84 return (void *)fdt;
85}
86
87#ifdef CONFIG_RELOCATABLE
88
89void __init plat_fdt_relocated(void *new_location)
90{
91 /*
92 * reset fdt as the cached value would point to the location
93 * before relocations happened and update the location argument
94 * if it was passed using UHI
95 */
96 fdt = NULL;
97
98 if (fw_arg0 == -2)
99 fw_arg1 = (unsigned long)new_location;
100}
101
102#endif /* CONFIG_RELOCATABLE */
103
104void __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
125int __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
152void __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 timer_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 of_node_put(intc_node);
203
204 irqchip_init();
205}
206
207void __init prom_free_prom_memory(void)
208{
209}