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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// 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/clk-provider.h>
9#include <linux/clocksource.h>
10#include <linux/init.h>
11#include <linux/irqchip.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 __initdata const void *fdt;
24static __initdata const struct mips_machine *mach;
25static __initdata 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}