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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> | |
eed0eabd | 17 | |
b47e9c62 | 18 | #include <asm/bootinfo.h> |
eed0eabd PB |
19 | #include <asm/fw/fw.h> |
20 | #include <asm/irq_cpu.h> | |
21 | #include <asm/machine.h> | |
7f005f11 | 22 | #include <asm/mips-cps.h> |
eed0eabd PB |
23 | #include <asm/prom.h> |
24 | #include <asm/smp-ops.h> | |
25 | #include <asm/time.h> | |
26 | ||
27 | static __initdata const void *fdt; | |
28 | static __initdata const struct mips_machine *mach; | |
29 | static __initdata const void *mach_match_data; | |
30 | ||
31 | void __init prom_init(void) | |
9a59061c MR |
32 | { |
33 | plat_get_fdt(); | |
34 | BUG_ON(!fdt); | |
35 | } | |
36 | ||
37 | void __init *plat_get_fdt(void) | |
eed0eabd PB |
38 | { |
39 | const struct mips_machine *check_mach; | |
40 | const struct of_device_id *match; | |
41 | ||
9a59061c MR |
42 | if (fdt) |
43 | /* Already set up */ | |
44 | return (void *)fdt; | |
45 | ||
67eebf72 | 46 | if ((fw_arg0 == -2) && !fdt_check_header((void *)fw_passed_dtb)) { |
eed0eabd PB |
47 | /* |
48 | * We booted using the UHI boot protocol, so we have been | |
49 | * provided with the appropriate device tree for the board. | |
50 | * Make use of it & search for any machine struct based upon | |
51 | * the root compatible string. | |
52 | */ | |
67eebf72 | 53 | fdt = (void *)fw_passed_dtb; |
eed0eabd PB |
54 | |
55 | for_each_mips_machine(check_mach) { | |
56 | match = mips_machine_is_compatible(check_mach, fdt); | |
57 | if (match) { | |
58 | mach = check_mach; | |
59 | mach_match_data = match->data; | |
60 | break; | |
61 | } | |
62 | } | |
63 | } else if (IS_ENABLED(CONFIG_LEGACY_BOARDS)) { | |
64 | /* | |
65 | * We weren't booted using the UHI boot protocol, but do | |
66 | * support some number of boards with legacy boot protocols. | |
67 | * Attempt to find the right one. | |
68 | */ | |
69 | for_each_mips_machine(check_mach) { | |
70 | if (!check_mach->detect) | |
71 | continue; | |
72 | ||
73 | if (!check_mach->detect()) | |
74 | continue; | |
75 | ||
76 | mach = check_mach; | |
77 | } | |
78 | ||
79 | /* | |
80 | * If we don't recognise the machine then we can't continue, so | |
81 | * die here. | |
82 | */ | |
83 | BUG_ON(!mach); | |
84 | ||
85 | /* Retrieve the machine's FDT */ | |
86 | fdt = mach->fdt; | |
87 | } | |
eed0eabd PB |
88 | return (void *)fdt; |
89 | } | |
90 | ||
b47e9c62 PB |
91 | #ifdef CONFIG_RELOCATABLE |
92 | ||
0063fded MN |
93 | void __init plat_fdt_relocated(void *new_location) |
94 | { | |
95 | /* | |
96 | * reset fdt as the cached value would point to the location | |
97 | * before relocations happened and update the location argument | |
98 | * if it was passed using UHI | |
99 | */ | |
100 | fdt = NULL; | |
101 | ||
102 | if (fw_arg0 == -2) | |
103 | fw_arg1 = (unsigned long)new_location; | |
104 | } | |
105 | ||
b47e9c62 PB |
106 | #endif /* CONFIG_RELOCATABLE */ |
107 | ||
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108 | void __init plat_mem_setup(void) |
109 | { | |
110 | if (mach && mach->fixup_fdt) | |
111 | fdt = mach->fixup_fdt(fdt, mach_match_data); | |
112 | ||
113 | strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE); | |
114 | __dt_setup_arch((void *)fdt); | |
115 | } | |
116 | ||
117 | void __init device_tree_init(void) | |
118 | { | |
119 | int err; | |
120 | ||
121 | unflatten_and_copy_device_tree(); | |
122 | mips_cpc_probe(); | |
123 | ||
124 | err = register_cps_smp_ops(); | |
125 | if (err) | |
126 | err = register_up_smp_ops(); | |
127 | } | |
128 | ||
e889dfca PB |
129 | int __init apply_mips_fdt_fixups(void *fdt_out, size_t fdt_out_size, |
130 | const void *fdt_in, | |
131 | const struct mips_fdt_fixup *fixups) | |
132 | { | |
133 | int err; | |
134 | ||
135 | err = fdt_open_into(fdt_in, fdt_out, fdt_out_size); | |
136 | if (err) { | |
137 | pr_err("Failed to open FDT\n"); | |
138 | return err; | |
139 | } | |
140 | ||
141 | for (; fixups->apply; fixups++) { | |
142 | err = fixups->apply(fdt_out); | |
143 | if (err) { | |
144 | pr_err("Failed to apply FDT fixup \"%s\"\n", | |
145 | fixups->description); | |
146 | return err; | |
147 | } | |
148 | } | |
149 | ||
150 | err = fdt_pack(fdt_out); | |
151 | if (err) | |
152 | pr_err("Failed to pack FDT\n"); | |
153 | return err; | |
154 | } | |
155 | ||
eed0eabd PB |
156 | void __init plat_time_init(void) |
157 | { | |
158 | struct device_node *np; | |
159 | struct clk *clk; | |
160 | ||
161 | of_clk_init(NULL); | |
162 | ||
163 | if (!cpu_has_counter) { | |
164 | mips_hpt_frequency = 0; | |
165 | } else if (mach && mach->measure_hpt_freq) { | |
166 | mips_hpt_frequency = mach->measure_hpt_freq(); | |
167 | } else { | |
168 | np = of_get_cpu_node(0, NULL); | |
169 | if (!np) { | |
170 | pr_err("Failed to get CPU node\n"); | |
171 | return; | |
172 | } | |
173 | ||
174 | clk = of_clk_get(np, 0); | |
175 | if (IS_ERR(clk)) { | |
176 | pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk)); | |
177 | return; | |
178 | } | |
179 | ||
180 | mips_hpt_frequency = clk_get_rate(clk); | |
181 | clk_put(clk); | |
182 | ||
183 | switch (boot_cpu_type()) { | |
184 | case CPU_20KC: | |
185 | case CPU_25KF: | |
186 | /* The counter runs at the CPU clock rate */ | |
187 | break; | |
188 | default: | |
189 | /* The counter runs at half the CPU clock rate */ | |
190 | mips_hpt_frequency /= 2; | |
191 | break; | |
192 | } | |
193 | } | |
194 | ||
ba5d08c0 | 195 | timer_probe(); |
eed0eabd PB |
196 | } |
197 | ||
198 | void __init arch_init_irq(void) | |
199 | { | |
200 | struct device_node *intc_node; | |
201 | ||
202 | intc_node = of_find_compatible_node(NULL, NULL, | |
203 | "mti,cpu-interrupt-controller"); | |
204 | if (!cpu_has_veic && !intc_node) | |
205 | mips_cpu_irq_init(); | |
28ec2238 | 206 | of_node_put(intc_node); |
eed0eabd PB |
207 | |
208 | irqchip_init(); | |
209 | } | |
210 | ||
eed0eabd PB |
211 | void __init prom_free_prom_memory(void) |
212 | { | |
213 | } |