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/bootinfo.h> 20 #include <asm/fw/fw.h> 21 #include <asm/irq_cpu.h> 22 #include <asm/machine.h> 23 #include <asm/mips-cpc.h> 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) 33 { 34 plat_get_fdt(); 35 BUG_ON(!fdt); 36 } 37 38 void __init *plat_get_fdt(void) 39 { 40 const struct mips_machine *check_mach; 41 const struct of_device_id *match; 42 43 if (fdt) 44 /* Already set up */ 45 return (void *)fdt; 46 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 } 89 return (void *)fdt; 90 } 91 92 #ifdef CONFIG_RELOCATABLE 93 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 } 106 107 #endif /* CONFIG_RELOCATABLE */ 108 109 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 } 129 130 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 } 156 157 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 } 195 196 timer_probe(); 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 } 226