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
23 static __initconst const void *fdt;
24 static __initconst const struct mips_machine *mach;
25 static __initconst const void *mach_match_data;
26
27 void __init prom_init(void)
28 {
29 plat_get_fdt();
30 BUG_ON(!fdt);
31 }
32
33 void __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
87 void __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
102 void __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
111 void __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
124 int __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
151 void __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
193 void __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 }
205
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