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1 | /* | |
2 | * Copyright (C) 2016 Imagination Technologies | |
3 | * Author: Paul Burton <paul.burton@imgtec.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/fw/fw.h> | |
20 | #include <asm/irq_cpu.h> | |
21 | #include <asm/machine.h> | |
22 | #include <asm/mips-cpc.h> | |
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) | |
32 | { | |
33 | plat_get_fdt(); | |
34 | BUG_ON(!fdt); | |
35 | } | |
36 | ||
37 | void __init *plat_get_fdt(void) | |
38 | { | |
39 | const struct mips_machine *check_mach; | |
40 | const struct of_device_id *match; | |
41 | ||
42 | if (fdt) | |
43 | /* Already set up */ | |
44 | return (void *)fdt; | |
45 | ||
46 | if ((fw_arg0 == -2) && !fdt_check_header((void *)fw_arg1)) { | |
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 | */ | |
53 | fdt = (void *)fw_arg1; | |
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 | } | |
88 | return (void *)fdt; | |
89 | } | |
90 | ||
91 | void __init plat_fdt_relocated(void *new_location) | |
92 | { | |
93 | /* | |
94 | * reset fdt as the cached value would point to the location | |
95 | * before relocations happened and update the location argument | |
96 | * if it was passed using UHI | |
97 | */ | |
98 | fdt = NULL; | |
99 | ||
100 | if (fw_arg0 == -2) | |
101 | fw_arg1 = (unsigned long)new_location; | |
102 | } | |
103 | ||
104 | void __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 | ||
113 | void __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 | ||
125 | int __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 | ||
152 | void __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 | ||
194 | void __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 | ||
203 | irqchip_init(); | |
204 | } | |
205 | ||
206 | static int __init publish_devices(void) | |
207 | { | |
208 | if (!of_have_populated_dt()) | |
209 | panic("Device-tree not present"); | |
210 | ||
211 | if (of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL)) | |
212 | panic("Failed to populate DT"); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | arch_initcall(publish_devices); | |
217 | ||
218 | void __init prom_free_prom_memory(void) | |
219 | { | |
220 | } |