linux/arch/openrisc/kernel/setup.c
<<
>>
Prefs
   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
  46static 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
  94struct cpuinfo_or1k cpuinfo_or1k[NR_CPUS];
  95
  96static 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
 155static struct device_node *setup_find_cpu_node(int cpu)
 156{
 157        u32 hwid;
 158        struct device_node *cpun;
 159
 160        for_each_of_cpu_node(cpun) {
 161                if (of_property_read_u32(cpun, "reg", &hwid))
 162                        continue;
 163                if (hwid == cpu)
 164                        return cpun;
 165        }
 166
 167        return NULL;
 168}
 169
 170void __init setup_cpuinfo(void)
 171{
 172        struct device_node *cpu;
 173        unsigned long iccfgr, dccfgr;
 174        unsigned long cache_set_size;
 175        int cpu_id = smp_processor_id();
 176        struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[cpu_id];
 177
 178        cpu = setup_find_cpu_node(cpu_id);
 179        if (!cpu)
 180                panic("Couldn't find CPU%d in device tree...\n", cpu_id);
 181
 182        iccfgr = mfspr(SPR_ICCFGR);
 183        cpuinfo->icache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
 184        cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3);
 185        cpuinfo->icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7);
 186        cpuinfo->icache_size =
 187            cache_set_size * cpuinfo->icache_ways * cpuinfo->icache_block_size;
 188
 189        dccfgr = mfspr(SPR_DCCFGR);
 190        cpuinfo->dcache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
 191        cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
 192        cpuinfo->dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7);
 193        cpuinfo->dcache_size =
 194            cache_set_size * cpuinfo->dcache_ways * cpuinfo->dcache_block_size;
 195
 196        if (of_property_read_u32(cpu, "clock-frequency",
 197                                 &cpuinfo->clock_frequency)) {
 198                printk(KERN_WARNING
 199                       "Device tree missing CPU 'clock-frequency' parameter."
 200                       "Assuming frequency 25MHZ"
 201                       "This is probably not what you want.");
 202        }
 203
 204        cpuinfo->coreid = mfspr(SPR_COREID);
 205
 206        of_node_put(cpu);
 207
 208        print_cpuinfo();
 209}
 210
 211/**
 212 * or32_early_setup
 213 *
 214 * Handles the pointer to the device tree that this kernel is to use
 215 * for establishing the available platform devices.
 216 *
 217 * Falls back on built-in device tree in case null pointer is passed.
 218 */
 219
 220void __init or32_early_setup(void *fdt)
 221{
 222        if (fdt)
 223                pr_info("FDT at %p\n", fdt);
 224        else {
 225                fdt = __dtb_start;
 226                pr_info("Compiled-in FDT at %p\n", fdt);
 227        }
 228        early_init_devtree(fdt);
 229}
 230
 231static inline unsigned long extract_value_bits(unsigned long reg,
 232                                               short bit_nr, short width)
 233{
 234        return (reg >> bit_nr) & (0 << width);
 235}
 236
 237static inline unsigned long extract_value(unsigned long reg, unsigned long mask)
 238{
 239        while (!(mask & 0x1)) {
 240                reg = reg >> 1;
 241                mask = mask >> 1;
 242        }
 243        return mask & reg;
 244}
 245
 246void __init detect_unit_config(unsigned long upr, unsigned long mask,
 247                               char *text, void (*func) (void))
 248{
 249        if (text != NULL)
 250                printk("%s", text);
 251
 252        if (upr & mask) {
 253                if (func != NULL)
 254                        func();
 255                else
 256                        printk("present\n");
 257        } else
 258                printk("not present\n");
 259}
 260
 261/*
 262 * calibrate_delay
 263 *
 264 * Lightweight calibrate_delay implementation that calculates loops_per_jiffy
 265 * from the clock frequency passed in via the device tree
 266 *
 267 */
 268
 269void calibrate_delay(void)
 270{
 271        const int *val;
 272        struct device_node *cpu = setup_find_cpu_node(smp_processor_id());
 273
 274        val = of_get_property(cpu, "clock-frequency", NULL);
 275        if (!val)
 276                panic("no cpu 'clock-frequency' parameter in device tree");
 277        loops_per_jiffy = *val / HZ;
 278        pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
 279                loops_per_jiffy / (500000 / HZ),
 280                (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
 281
 282        of_node_put(cpu);
 283}
 284
 285void __init setup_arch(char **cmdline_p)
 286{
 287        unflatten_and_copy_device_tree();
 288
 289        setup_cpuinfo();
 290
 291#ifdef CONFIG_SMP
 292        smp_init_cpus();
 293#endif
 294
 295        /* process 1's initial memory region is the kernel code/data */
 296        setup_initial_init_mm(_stext, _etext, _edata, _end);
 297
 298#ifdef CONFIG_BLK_DEV_INITRD
 299        if (initrd_start == initrd_end) {
 300                printk(KERN_INFO "Initial ramdisk not found\n");
 301                initrd_start = 0;
 302                initrd_end = 0;
 303        } else {
 304                printk(KERN_INFO "Initial ramdisk at: 0x%p (%lu bytes)\n",
 305                       (void *)(initrd_start), initrd_end - initrd_start);
 306                initrd_below_start_ok = 1;
 307        }
 308#endif
 309
 310        /* setup memblock allocator */
 311        setup_memory();
 312
 313        /* paging_init() sets up the MMU and marks all pages as reserved */
 314        paging_init();
 315
 316        *cmdline_p = boot_command_line;
 317
 318        printk(KERN_INFO "OpenRISC Linux -- http://openrisc.io\n");
 319}
 320
 321static int show_cpuinfo(struct seq_file *m, void *v)
 322{
 323        unsigned int vr, cpucfgr;
 324        unsigned int avr;
 325        unsigned int version;
 326        struct cpuinfo_or1k *cpuinfo = v;
 327
 328        vr = mfspr(SPR_VR);
 329        cpucfgr = mfspr(SPR_CPUCFGR);
 330
 331#ifdef CONFIG_SMP
 332        seq_printf(m, "processor\t\t: %d\n", cpuinfo->coreid);
 333#endif
 334        if (vr & SPR_VR_UVRP) {
 335                vr = mfspr(SPR_VR2);
 336                version = vr & SPR_VR2_VER;
 337                avr = mfspr(SPR_AVR);
 338                seq_printf(m, "cpu architecture\t: "
 339                           "OpenRISC 1000 (%d.%d-rev%d)\n",
 340                           (avr >> 24) & 0xff,
 341                           (avr >> 16) & 0xff,
 342                           (avr >> 8) & 0xff);
 343                seq_printf(m, "cpu implementation id\t: 0x%x\n",
 344                           (vr & SPR_VR2_CPUID) >> 24);
 345                seq_printf(m, "cpu version\t\t: 0x%x\n", version);
 346        } else {
 347                version = (vr & SPR_VR_VER) >> 24;
 348                seq_printf(m, "cpu\t\t\t: OpenRISC-%x\n", version);
 349                seq_printf(m, "revision\t\t: %d\n", vr & SPR_VR_REV);
 350        }
 351        seq_printf(m, "frequency\t\t: %ld\n", loops_per_jiffy * HZ);
 352        seq_printf(m, "dcache size\t\t: %d bytes\n", cpuinfo->dcache_size);
 353        seq_printf(m, "dcache block size\t: %d bytes\n",
 354                   cpuinfo->dcache_block_size);
 355        seq_printf(m, "dcache ways\t\t: %d\n", cpuinfo->dcache_ways);
 356        seq_printf(m, "icache size\t\t: %d bytes\n", cpuinfo->icache_size);
 357        seq_printf(m, "icache block size\t: %d bytes\n",
 358                   cpuinfo->icache_block_size);
 359        seq_printf(m, "icache ways\t\t: %d\n", cpuinfo->icache_ways);
 360        seq_printf(m, "immu\t\t\t: %d entries, %lu ways\n",
 361                   1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
 362                   1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
 363        seq_printf(m, "dmmu\t\t\t: %d entries, %lu ways\n",
 364                   1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
 365                   1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
 366        seq_printf(m, "bogomips\t\t: %lu.%02lu\n",
 367                   (loops_per_jiffy * HZ) / 500000,
 368                   ((loops_per_jiffy * HZ) / 5000) % 100);
 369
 370        seq_puts(m, "features\t\t: ");
 371        seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB32S ? "orbis32" : "");
 372        seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB64S ? "orbis64" : "");
 373        seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF32S ? "orfpx32" : "");
 374        seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF64S ? "orfpx64" : "");
 375        seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OV64S ? "orvdx64" : "");
 376        seq_puts(m, "\n");
 377
 378        seq_puts(m, "\n");
 379
 380        return 0;
 381}
 382
 383static void *c_start(struct seq_file *m, loff_t *pos)
 384{
 385        *pos = cpumask_next(*pos - 1, cpu_online_mask);
 386        if ((*pos) < nr_cpu_ids)
 387                return &cpuinfo_or1k[*pos];
 388        return NULL;
 389}
 390
 391static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 392{
 393        (*pos)++;
 394        return c_start(m, pos);
 395}
 396
 397static void c_stop(struct seq_file *m, void *v)
 398{
 399}
 400
 401const struct seq_operations cpuinfo_op = {
 402        .start = c_start,
 403        .next = c_next,
 404        .stop = c_stop,
 405        .show = show_cpuinfo,
 406};
 407