Paul Burton | eed0eab | 2016-10-05 18:18:20 +0100 | [diff] [blame] | 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 | { |
Matt Redfearn | 9a59061 | 2016-10-17 17:25:24 +0100 | [diff] [blame] | 33 | plat_get_fdt(); |
| 34 | BUG_ON(!fdt); |
| 35 | } |
| 36 | |
| 37 | void __init *plat_get_fdt(void) |
| 38 | { |
Paul Burton | eed0eab | 2016-10-05 18:18:20 +0100 | [diff] [blame] | 39 | const struct mips_machine *check_mach; |
| 40 | const struct of_device_id *match; |
| 41 | |
Matt Redfearn | 9a59061 | 2016-10-17 17:25:24 +0100 | [diff] [blame] | 42 | if (fdt) |
| 43 | /* Already set up */ |
| 44 | return (void *)fdt; |
| 45 | |
Paul Burton | eed0eab | 2016-10-05 18:18:20 +0100 | [diff] [blame] | 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 | } |
Paul Burton | eed0eab | 2016-10-05 18:18:20 +0100 | [diff] [blame] | 88 | return (void *)fdt; |
| 89 | } |
| 90 | |
Marcin Nowakowski | 0063fde | 2016-11-23 14:43:47 +0100 | [diff] [blame] | 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 | |
Paul Burton | eed0eab | 2016-10-05 18:18:20 +0100 | [diff] [blame] | 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 | |
Paul Burton | e889dfc | 2017-06-02 12:29:54 -0700 | [diff] [blame^] | 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 | |
Paul Burton | eed0eab | 2016-10-05 18:18:20 +0100 | [diff] [blame] | 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 | clocksource_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 | } |