2 * Copyright (C) 2016 Imagination Technologies
3 * Author: Paul Burton <paul.burton@imgtec.com>
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.
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>
19 #include <asm/fw/fw.h>
20 #include <asm/irq_cpu.h>
21 #include <asm/machine.h>
22 #include <asm/mips-cpc.h>
24 #include <asm/smp-ops.h>
27 static __initdata const void *fdt;
28 static __initdata const struct mips_machine *mach;
29 static __initdata const void *mach_match_data;
31 void __init prom_init(void)
37 void __init *plat_get_fdt(void)
39 const struct mips_machine *check_mach;
40 const struct of_device_id *match;
46 if ((fw_arg0 == -2) && !fdt_check_header((void *)fw_arg1)) {
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.
53 fdt = (void *)fw_arg1;
55 for_each_mips_machine(check_mach) {
56 match = mips_machine_is_compatible(check_mach, fdt);
59 mach_match_data = match->data;
63 } else if (IS_ENABLED(CONFIG_LEGACY_BOARDS)) {
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.
69 for_each_mips_machine(check_mach) {
70 if (!check_mach->detect)
73 if (!check_mach->detect())
80 * If we don't recognise the machine then we can't continue, so
85 /* Retrieve the machine's FDT */
91 void __init plat_fdt_relocated(void *new_location)
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
101 fw_arg1 = (unsigned long)new_location;
104 void __init plat_mem_setup(void)
106 if (mach && mach->fixup_fdt)
107 fdt = mach->fixup_fdt(fdt, mach_match_data);
109 strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
110 __dt_setup_arch((void *)fdt);
113 void __init device_tree_init(void)
117 unflatten_and_copy_device_tree();
120 err = register_cps_smp_ops();
122 err = register_up_smp_ops();
125 int __init apply_mips_fdt_fixups(void *fdt_out, size_t fdt_out_size,
127 const struct mips_fdt_fixup *fixups)
131 err = fdt_open_into(fdt_in, fdt_out, fdt_out_size);
133 pr_err("Failed to open FDT\n");
137 for (; fixups->apply; fixups++) {
138 err = fixups->apply(fdt_out);
140 pr_err("Failed to apply FDT fixup \"%s\"\n",
141 fixups->description);
146 err = fdt_pack(fdt_out);
148 pr_err("Failed to pack FDT\n");
152 void __init plat_time_init(void)
154 struct device_node *np;
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();
164 np = of_get_cpu_node(0, NULL);
166 pr_err("Failed to get CPU node\n");
170 clk = of_clk_get(np, 0);
172 pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
176 mips_hpt_frequency = clk_get_rate(clk);
179 switch (boot_cpu_type()) {
182 /* The counter runs at the CPU clock rate */
185 /* The counter runs at half the CPU clock rate */
186 mips_hpt_frequency /= 2;
194 void __init arch_init_irq(void)
196 struct device_node *intc_node;
198 intc_node = of_find_compatible_node(NULL, NULL,
199 "mti,cpu-interrupt-controller");
200 if (!cpu_has_veic && !intc_node)
206 static int __init publish_devices(void)
208 if (!of_have_populated_dt())
209 panic("Device-tree not present");
211 if (of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL))
212 panic("Failed to populate DT");
216 arch_initcall(publish_devices);
218 void __init prom_free_prom_memory(void)