1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * OpenRISC setup.c 4 * 5 * Linux architectural port borrowing liberally from similar works of 6 * others. All original copyrights apply as per the original source 7 * declaration. 8 * 9 * Modifications for the OpenRISC architecture: 10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> 11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> 12 * 13 * This file handles the architecture-dependent parts of initialization 14 */ 15 16 #include <linux/errno.h> 17 #include <linux/sched.h> 18 #include <linux/kernel.h> 19 #include <linux/mm.h> 20 #include <linux/stddef.h> 21 #include <linux/unistd.h> 22 #include <linux/ptrace.h> 23 #include <linux/slab.h> 24 #include <linux/tty.h> 25 #include <linux/ioport.h> 26 #include <linux/delay.h> 27 #include <linux/console.h> 28 #include <linux/init.h> 29 #include <linux/memblock.h> 30 #include <linux/seq_file.h> 31 #include <linux/serial.h> 32 #include <linux/initrd.h> 33 #include <linux/of_fdt.h> 34 #include <linux/of.h> 35 #include <linux/device.h> 36 37 #include <asm/sections.h> 38 #include <asm/types.h> 39 #include <asm/setup.h> 40 #include <asm/io.h> 41 #include <asm/cpuinfo.h> 42 #include <asm/delay.h> 43 44 #include "vmlinux.h" 45 46 static void __init setup_memory(void) 47 { 48 unsigned long ram_start_pfn; 49 unsigned long ram_end_pfn; 50 phys_addr_t memory_start, memory_end; 51 52 memory_end = memory_start = 0; 53 54 /* Find main memory where is the kernel, we assume its the only one */ 55 memory_start = memblock_start_of_DRAM(); 56 memory_end = memblock_end_of_DRAM(); 57 58 if (!memory_end) { 59 panic("No memory!"); 60 } 61 62 ram_start_pfn = PFN_UP(memory_start); 63 ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM()); 64 65 /* setup bootmem globals (we use no_bootmem, but mm still depends on this) */ 66 min_low_pfn = ram_start_pfn; 67 max_low_pfn = ram_end_pfn; 68 max_pfn = ram_end_pfn; 69 70 /* 71 * initialize the boot-time allocator (with low memory only). 72 * 73 * This makes the memory from the end of the kernel to the end of 74 * RAM usable. 75 */ 76 memblock_reserve(__pa(_stext), _end - _stext); 77 78 #ifdef CONFIG_BLK_DEV_INITRD 79 /* Then reserve the initrd, if any */ 80 if (initrd_start && (initrd_end > initrd_start)) { 81 unsigned long aligned_start = ALIGN_DOWN(initrd_start, PAGE_SIZE); 82 unsigned long aligned_end = ALIGN(initrd_end, PAGE_SIZE); 83 84 memblock_reserve(__pa(aligned_start), aligned_end - aligned_start); 85 } 86 #endif /* CONFIG_BLK_DEV_INITRD */ 87 88 early_init_fdt_reserve_self(); 89 early_init_fdt_scan_reserved_mem(); 90 91 memblock_dump_all(); 92 } 93 94 struct cpuinfo_or1k cpuinfo_or1k[NR_CPUS]; 95 96 static void print_cpuinfo(void) 97 { 98 unsigned long upr = mfspr(SPR_UPR); 99 unsigned long vr = mfspr(SPR_VR); 100 unsigned int version; 101 unsigned int revision; 102 struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()]; 103 104 version = (vr & SPR_VR_VER) >> 24; 105 revision = (vr & SPR_VR_REV); 106 107 printk(KERN_INFO "CPU: OpenRISC-%x (revision %d) @%d MHz\n", 108 version, revision, cpuinfo->clock_frequency / 1000000); 109 110 if (!(upr & SPR_UPR_UP)) { 111 printk(KERN_INFO 112 "-- no UPR register... unable to detect configuration\n"); 113 return; 114 } 115 116 if (upr & SPR_UPR_DCP) 117 printk(KERN_INFO 118 "-- dcache: %4d bytes total, %2d bytes/line, %d way(s)\n", 119 cpuinfo->dcache_size, cpuinfo->dcache_block_size, 120 cpuinfo->dcache_ways); 121 else 122 printk(KERN_INFO "-- dcache disabled\n"); 123 if (upr & SPR_UPR_ICP) 124 printk(KERN_INFO 125 "-- icache: %4d bytes total, %2d bytes/line, %d way(s)\n", 126 cpuinfo->icache_size, cpuinfo->icache_block_size, 127 cpuinfo->icache_ways); 128 else 129 printk(KERN_INFO "-- icache disabled\n"); 130 131 if (upr & SPR_UPR_DMP) 132 printk(KERN_INFO "-- dmmu: %4d entries, %lu way(s)\n", 133 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2), 134 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW)); 135 if (upr & SPR_UPR_IMP) 136 printk(KERN_INFO "-- immu: %4d entries, %lu way(s)\n", 137 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2), 138 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW)); 139 140 printk(KERN_INFO "-- additional features:\n"); 141 if (upr & SPR_UPR_DUP) 142 printk(KERN_INFO "-- debug unit\n"); 143 if (upr & SPR_UPR_PCUP) 144 printk(KERN_INFO "-- performance counters\n"); 145 if (upr & SPR_UPR_PMP) 146 printk(KERN_INFO "-- power management\n"); 147 if (upr & SPR_UPR_PICP) 148 printk(KERN_INFO "-- PIC\n"); 149 if (upr & SPR_UPR_TTP) 150 printk(KERN_INFO "-- timer\n"); 151 if (upr & SPR_UPR_CUP) 152 printk(KERN_INFO "-- custom unit(s)\n"); 153 } 154 155 void __init setup_cpuinfo(void) 156 { 157 struct device_node *cpu; 158 unsigned long iccfgr, dccfgr; 159 unsigned long cache_set_size; 160 int cpu_id = smp_processor_id(); 161 struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[cpu_id]; 162 163 cpu = of_get_cpu_node(cpu_id, NULL); 164 if (!cpu) 165 panic("Couldn't find CPU%d in device tree...\n", cpu_id); 166 167 iccfgr = mfspr(SPR_ICCFGR); 168 cpuinfo->icache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW); 169 cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3); 170 cpuinfo->icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7); 171 cpuinfo->icache_size = 172 cache_set_size * cpuinfo->icache_ways * cpuinfo->icache_block_size; 173 174 dccfgr = mfspr(SPR_DCCFGR); 175 cpuinfo->dcache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW); 176 cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3); 177 cpuinfo->dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7); 178 cpuinfo->dcache_size = 179 cache_set_size * cpuinfo->dcache_ways * cpuinfo->dcache_block_size; 180 181 if (of_property_read_u32(cpu, "clock-frequency", 182 &cpuinfo->clock_frequency)) { 183 printk(KERN_WARNING 184 "Device tree missing CPU 'clock-frequency' parameter." 185 "Assuming frequency 25MHZ" 186 "This is probably not what you want."); 187 } 188 189 cpuinfo->coreid = mfspr(SPR_COREID); 190 191 of_node_put(cpu); 192 193 print_cpuinfo(); 194 } 195 196 /** 197 * or1k_early_setup 198 * @fdt: pointer to the start of the device tree in memory or NULL 199 * 200 * Handles the pointer to the device tree that this kernel is to use 201 * for establishing the available platform devices. 202 * 203 * Falls back on built-in device tree in case null pointer is passed. 204 */ 205 206 void __init or1k_early_setup(void *fdt) 207 { 208 if (fdt) 209 pr_info("FDT at %p\n", fdt); 210 else { 211 fdt = __dtb_start; 212 pr_info("Compiled-in FDT at %p\n", fdt); 213 } 214 early_init_devtree(fdt); 215 } 216 217 static inline unsigned long extract_value_bits(unsigned long reg, 218 short bit_nr, short width) 219 { 220 return (reg >> bit_nr) & (0 << width); 221 } 222 223 static inline unsigned long extract_value(unsigned long reg, unsigned long mask) 224 { 225 while (!(mask & 0x1)) { 226 reg = reg >> 1; 227 mask = mask >> 1; 228 } 229 return mask & reg; 230 } 231 232 /* 233 * calibrate_delay 234 * 235 * Lightweight calibrate_delay implementation that calculates loops_per_jiffy 236 * from the clock frequency passed in via the device tree 237 * 238 */ 239 240 void calibrate_delay(void) 241 { 242 const int *val; 243 struct device_node *cpu = of_get_cpu_node(smp_processor_id(), NULL); 244 245 val = of_get_property(cpu, "clock-frequency", NULL); 246 if (!val) 247 panic("no cpu 'clock-frequency' parameter in device tree"); 248 loops_per_jiffy = *val / HZ; 249 pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n", 250 loops_per_jiffy / (500000 / HZ), 251 (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy); 252 253 of_node_put(cpu); 254 } 255 256 void __init setup_arch(char **cmdline_p) 257 { 258 unflatten_and_copy_device_tree(); 259 260 setup_cpuinfo(); 261 262 #ifdef CONFIG_SMP 263 smp_init_cpus(); 264 #endif 265 266 /* process 1's initial memory region is the kernel code/data */ 267 setup_initial_init_mm(_stext, _etext, _edata, _end); 268 269 #ifdef CONFIG_BLK_DEV_INITRD 270 if (initrd_start == initrd_end) { 271 printk(KERN_INFO "Initial ramdisk not found\n"); 272 initrd_start = 0; 273 initrd_end = 0; 274 } else { 275 printk(KERN_INFO "Initial ramdisk at: 0x%p (%lu bytes)\n", 276 (void *)(initrd_start), initrd_end - initrd_start); 277 initrd_below_start_ok = 1; 278 } 279 #endif 280 281 /* setup memblock allocator */ 282 setup_memory(); 283 284 /* paging_init() sets up the MMU and marks all pages as reserved */ 285 paging_init(); 286 287 *cmdline_p = boot_command_line; 288 289 printk(KERN_INFO "OpenRISC Linux -- http://openrisc.io\n"); 290 } 291 292 static int show_cpuinfo(struct seq_file *m, void *v) 293 { 294 unsigned int vr, cpucfgr; 295 unsigned int avr; 296 unsigned int version; 297 struct cpuinfo_or1k *cpuinfo = v; 298 299 vr = mfspr(SPR_VR); 300 cpucfgr = mfspr(SPR_CPUCFGR); 301 302 #ifdef CONFIG_SMP 303 seq_printf(m, "processor\t\t: %d\n", cpuinfo->coreid); 304 #endif 305 if (vr & SPR_VR_UVRP) { 306 vr = mfspr(SPR_VR2); 307 version = vr & SPR_VR2_VER; 308 avr = mfspr(SPR_AVR); 309 seq_printf(m, "cpu architecture\t: " 310 "OpenRISC 1000 (%d.%d-rev%d)\n", 311 (avr >> 24) & 0xff, 312 (avr >> 16) & 0xff, 313 (avr >> 8) & 0xff); 314 seq_printf(m, "cpu implementation id\t: 0x%x\n", 315 (vr & SPR_VR2_CPUID) >> 24); 316 seq_printf(m, "cpu version\t\t: 0x%x\n", version); 317 } else { 318 version = (vr & SPR_VR_VER) >> 24; 319 seq_printf(m, "cpu\t\t\t: OpenRISC-%x\n", version); 320 seq_printf(m, "revision\t\t: %d\n", vr & SPR_VR_REV); 321 } 322 seq_printf(m, "frequency\t\t: %ld\n", loops_per_jiffy * HZ); 323 seq_printf(m, "dcache size\t\t: %d bytes\n", cpuinfo->dcache_size); 324 seq_printf(m, "dcache block size\t: %d bytes\n", 325 cpuinfo->dcache_block_size); 326 seq_printf(m, "dcache ways\t\t: %d\n", cpuinfo->dcache_ways); 327 seq_printf(m, "icache size\t\t: %d bytes\n", cpuinfo->icache_size); 328 seq_printf(m, "icache block size\t: %d bytes\n", 329 cpuinfo->icache_block_size); 330 seq_printf(m, "icache ways\t\t: %d\n", cpuinfo->icache_ways); 331 seq_printf(m, "immu\t\t\t: %d entries, %lu ways\n", 332 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2), 333 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW)); 334 seq_printf(m, "dmmu\t\t\t: %d entries, %lu ways\n", 335 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2), 336 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW)); 337 seq_printf(m, "bogomips\t\t: %lu.%02lu\n", 338 (loops_per_jiffy * HZ) / 500000, 339 ((loops_per_jiffy * HZ) / 5000) % 100); 340 341 seq_puts(m, "features\t\t: "); 342 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB32S ? "orbis32" : ""); 343 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB64S ? "orbis64" : ""); 344 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF32S ? "orfpx32" : ""); 345 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF64S ? "orfpx64" : ""); 346 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OV64S ? "orvdx64" : ""); 347 seq_puts(m, "\n"); 348 349 seq_puts(m, "\n"); 350 351 return 0; 352 } 353 354 static void *c_start(struct seq_file *m, loff_t *pos) 355 { 356 *pos = cpumask_next(*pos - 1, cpu_online_mask); 357 if ((*pos) < nr_cpu_ids) 358 return &cpuinfo_or1k[*pos]; 359 return NULL; 360 } 361 362 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 363 { 364 (*pos)++; 365 return c_start(m, pos); 366 } 367 368 static void c_stop(struct seq_file *m, void *v) 369 { 370 } 371 372 const struct seq_operations cpuinfo_op = { 373 .start = c_start, 374 .next = c_next, 375 .stop = c_stop, 376 .show = show_cpuinfo, 377 }; 378