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eed0eabd PB |
1 | /* |
2 | * Copyright (C) 2016 Imagination Technologies | |
48c834be | 3 | * Author: Paul Burton <paul.burton@mips.com> |
eed0eabd PB |
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 | ||
b47e9c62 | 19 | #include <asm/bootinfo.h> |
eed0eabd PB |
20 | #include <asm/fw/fw.h> |
21 | #include <asm/irq_cpu.h> | |
22 | #include <asm/machine.h> | |
7f005f11 | 23 | #include <asm/mips-cps.h> |
eed0eabd PB |
24 | #include <asm/prom.h> |
25 | #include <asm/smp-ops.h> | |
26 | #include <asm/time.h> | |
27 | ||
28 | static __initdata const void *fdt; | |
29 | static __initdata const struct mips_machine *mach; | |
30 | static __initdata const void *mach_match_data; | |
31 | ||
32 | void __init prom_init(void) | |
9a59061c MR |
33 | { |
34 | plat_get_fdt(); | |
35 | BUG_ON(!fdt); | |
36 | } | |
37 | ||
38 | void __init *plat_get_fdt(void) | |
eed0eabd PB |
39 | { |
40 | const struct mips_machine *check_mach; | |
41 | const struct of_device_id *match; | |
42 | ||
9a59061c MR |
43 | if (fdt) |
44 | /* Already set up */ | |
45 | return (void *)fdt; | |
46 | ||
eed0eabd PB |
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 | } | |
eed0eabd PB |
89 | return (void *)fdt; |
90 | } | |
91 | ||
b47e9c62 PB |
92 | #ifdef CONFIG_RELOCATABLE |
93 | ||
0063fded MN |
94 | void __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 | ||
b47e9c62 PB |
107 | #endif /* CONFIG_RELOCATABLE */ |
108 | ||
eed0eabd PB |
109 | void __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 | ||
118 | void __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 | ||
e889dfca PB |
130 | int __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 | ||
eed0eabd PB |
157 | void __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 | ||
ba5d08c0 | 196 | timer_probe(); |
eed0eabd PB |
197 | } |
198 | ||
199 | void __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 | ||
211 | static 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 | } | |
221 | arch_initcall(publish_devices); | |
222 | ||
223 | void __init prom_free_prom_memory(void) | |
224 | { | |
225 | } |