arch/nds32/kernel/setup.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) 2005-2017 Andes Technology Corporation
   3
   4 #include <linux/cpu.h>
   5 #include <linux/bootmem.h>
   6 #include <linux/seq_file.h>
   7 #include <linux/memblock.h>
   8 #include <linux/console.h>
   9 #include <linux/screen_info.h>
  10 #include <linux/delay.h>
  11 #include <linux/dma-mapping.h>
  12 #include <linux/of_fdt.h>
  13 #include <linux/of_platform.h>
  14 #include <asm/setup.h>
  15 #include <asm/sections.h>
  16 #include <asm/proc-fns.h>
  17 #include <asm/cache_info.h>
  18 #include <asm/elf.h>
  19 #include <nds32_intrinsic.h>
  20
  21 #define HWCAP_MFUSR_PC          0x000001
  22 #define HWCAP_EXT               0x000002
  23 #define HWCAP_EXT2              0x000004
  24 #define HWCAP_FPU               0x000008
  25 #define HWCAP_AUDIO             0x000010
  26 #define HWCAP_BASE16            0x000020
  27 #define HWCAP_STRING            0x000040
  28 #define HWCAP_REDUCED_REGS      0x000080
  29 #define HWCAP_VIDEO             0x000100
  30 #define HWCAP_ENCRYPT           0x000200
  31 #define HWCAP_EDM               0x000400
  32 #define HWCAP_LMDMA             0x000800
  33 #define HWCAP_PFM               0x001000
  34 #define HWCAP_HSMP              0x002000
  35 #define HWCAP_TRACE             0x004000
  36 #define HWCAP_DIV               0x008000
  37 #define HWCAP_MAC               0x010000
  38 #define HWCAP_L2C               0x020000
  39 #define HWCAP_FPU_DP            0x040000
  40 #define HWCAP_V2                0x080000
  41 #define HWCAP_DX_REGS           0x100000
  42
  43 unsigned long cpu_id, cpu_rev, cpu_cfgid;
  44 char cpu_series;
  45 char *endianness = NULL;
  46
  47 unsigned int __atags_pointer __initdata;
  48 unsigned int elf_hwcap;
  49 EXPORT_SYMBOL(elf_hwcap);
  50
  51 /*
  52  * The following string table, must sync with HWCAP_xx bitmask,
  53  * which is defined in <asm/procinfo.h>
  54  */
  55 static const char *hwcap_str[] = {
  56         "mfusr_pc",
  57         "perf1",
  58         "perf2",
  59         "fpu",
  60         "audio",
  61         "16b",
  62         "string",
  63         "reduced_regs",
  64         "video",
  65         "encrypt",
  66         "edm",
  67         "lmdma",
  68         "pfm",
  69         "hsmp",
  70         "trace",
  71         "div",
  72         "mac",
  73         "l2c",
  74         "dx_regs",
  75         "v2",
  76         NULL,
  77 };
  78
  79 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
  80 #define WRITE_METHOD "write through"
  81 #else
  82 #define WRITE_METHOD "write back"
  83 #endif
  84
  85 struct cache_info L1_cache_info[2];
  86 static void __init dump_cpu_info(int cpu)
  87 {
  88         int i, p = 0;
  89         char str[sizeof(hwcap_str) + 16];
  90
  91         for (i = 0; hwcap_str[i]; i++) {
  92                 if (elf_hwcap & (1 << i)) {
  93                         sprintf(str + p, "%s ", hwcap_str[i]);
  94                         p += strlen(hwcap_str[i]) + 1;
  95                 }
  96         }
  97
  98         pr_info("CPU%d Features: %s\n", cpu, str);
  99
 100         L1_cache_info[ICACHE].ways = CACHE_WAY(ICACHE);
 101         L1_cache_info[ICACHE].line_size = CACHE_LINE_SIZE(ICACHE);
 102         L1_cache_info[ICACHE].sets = CACHE_SET(ICACHE);
 103         L1_cache_info[ICACHE].size =
 104             L1_cache_info[ICACHE].ways * L1_cache_info[ICACHE].line_size *
 105             L1_cache_info[ICACHE].sets / 1024;
 106         pr_info("L1I:%dKB/%dS/%dW/%dB\n", L1_cache_info[ICACHE].size,
 107                 L1_cache_info[ICACHE].sets, L1_cache_info[ICACHE].ways,
 108                 L1_cache_info[ICACHE].line_size);
 109         L1_cache_info[DCACHE].ways = CACHE_WAY(DCACHE);
 110         L1_cache_info[DCACHE].line_size = CACHE_LINE_SIZE(DCACHE);
 111         L1_cache_info[DCACHE].sets = CACHE_SET(DCACHE);
 112         L1_cache_info[DCACHE].size =
 113             L1_cache_info[DCACHE].ways * L1_cache_info[DCACHE].line_size *
 114             L1_cache_info[DCACHE].sets / 1024;
 115         pr_info("L1D:%dKB/%dS/%dW/%dB\n", L1_cache_info[DCACHE].size,
 116                 L1_cache_info[DCACHE].sets, L1_cache_info[DCACHE].ways,
 117                 L1_cache_info[DCACHE].line_size);
 118         pr_info("L1 D-Cache is %s\n", WRITE_METHOD);
 119         if (L1_cache_info[DCACHE].size != L1_CACHE_BYTES)
 120                 pr_crit
 121                     ("The cache line size(%d) of this processor is not the same as L1_CACHE_BYTES(%d).\n",
 122                      L1_cache_info[DCACHE].size, L1_CACHE_BYTES);
 123 #ifdef CONFIG_CPU_CACHE_ALIASING
 124         {
 125                 int aliasing_num;
 126                 aliasing_num =
 127                     L1_cache_info[ICACHE].size * 1024 / PAGE_SIZE /
 128                     L1_cache_info[ICACHE].ways;
 129                 L1_cache_info[ICACHE].aliasing_num = aliasing_num;
 130                 L1_cache_info[ICACHE].aliasing_mask =
 131                     (aliasing_num - 1) << PAGE_SHIFT;
 132                 aliasing_num =
 133                     L1_cache_info[DCACHE].size * 1024 / PAGE_SIZE /
 134                     L1_cache_info[DCACHE].ways;
 135                 L1_cache_info[DCACHE].aliasing_num = aliasing_num;
 136                 L1_cache_info[DCACHE].aliasing_mask =
 137                     (aliasing_num - 1) << PAGE_SHIFT;
 138         }
 139 #endif
 140 }
 141
 142 static void __init setup_cpuinfo(void)
 143 {
 144         unsigned long tmp = 0, cpu_name;
 145
 146         cpu_dcache_inval_all();
 147         cpu_icache_inval_all();
 148         __nds32__isb();
 149
 150         cpu_id = (__nds32__mfsr(NDS32_SR_CPU_VER) & CPU_VER_mskCPUID) >> CPU_VER_offCPUID;
 151         cpu_name = ((cpu_id) & 0xf0) >> 4;
 152         cpu_series = cpu_name ? cpu_name - 10 + 'A' : 'N';
 153         cpu_id = cpu_id & 0xf;
 154         cpu_rev = (__nds32__mfsr(NDS32_SR_CPU_VER) & CPU_VER_mskREV) >> CPU_VER_offREV;
 155         cpu_cfgid = (__nds32__mfsr(NDS32_SR_CPU_VER) & CPU_VER_mskCFGID) >> CPU_VER_offCFGID;
 156
 157         pr_info("CPU:%c%ld, CPU_VER 0x%08x(id %lu, rev %lu, cfg %lu)\n",
 158                 cpu_series, cpu_id, __nds32__mfsr(NDS32_SR_CPU_VER), cpu_id, cpu_rev, cpu_cfgid);
 159
 160         elf_hwcap |= HWCAP_MFUSR_PC;
 161
 162         if (((__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskBASEV) >> MSC_CFG_offBASEV) == 0) {
 163                 if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskDIV)
 164                         elf_hwcap |= HWCAP_DIV;
 165
 166                 if ((__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskMAC)
 167                     || (cpu_id == 12 && cpu_rev < 4))
 168                         elf_hwcap |= HWCAP_MAC;
 169         } else {
 170                 elf_hwcap |= HWCAP_V2;
 171                 elf_hwcap |= HWCAP_DIV;
 172                 elf_hwcap |= HWCAP_MAC;
 173         }
 174
 175         if (cpu_cfgid & 0x0001)
 176                 elf_hwcap |= HWCAP_EXT;
 177
 178         if (cpu_cfgid & 0x0002)
 179                 elf_hwcap |= HWCAP_BASE16;
 180
 181         if (cpu_cfgid & 0x0004)
 182                 elf_hwcap |= HWCAP_EXT2;
 183
 184         if (cpu_cfgid & 0x0008)
 185                 elf_hwcap |= HWCAP_FPU;
 186
 187         if (cpu_cfgid & 0x0010)
 188                 elf_hwcap |= HWCAP_STRING;
 189
 190         if (__nds32__mfsr(NDS32_SR_MMU_CFG) & MMU_CFG_mskDE)
 191                 endianness = "MSB";
 192         else
 193                 endianness = "LSB";
 194
 195         if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskEDM)
 196                 elf_hwcap |= HWCAP_EDM;
 197
 198         if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskLMDMA)
 199                 elf_hwcap |= HWCAP_LMDMA;
 200
 201         if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskPFM)
 202                 elf_hwcap |= HWCAP_PFM;
 203
 204         if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskHSMP)
 205                 elf_hwcap |= HWCAP_HSMP;
 206
 207         if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskTRACE)
 208                 elf_hwcap |= HWCAP_TRACE;
 209
 210         if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskAUDIO)
 211                 elf_hwcap |= HWCAP_AUDIO;
 212
 213         if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskL2C)
 214                 elf_hwcap |= HWCAP_L2C;
 215
 216         tmp = __nds32__mfsr(NDS32_SR_CACHE_CTL);
 217         if (!IS_ENABLED(CONFIG_CPU_DCACHE_DISABLE))
 218                 tmp |= CACHE_CTL_mskDC_EN;
 219
 220         if (!IS_ENABLED(CONFIG_CPU_ICACHE_DISABLE))
 221                 tmp |= CACHE_CTL_mskIC_EN;
 222         __nds32__mtsr_isb(tmp, NDS32_SR_CACHE_CTL);
 223
 224         dump_cpu_info(smp_processor_id());
 225 }
 226
 227 static void __init setup_memory(void)
 228 {
 229         unsigned long ram_start_pfn;
 230         unsigned long free_ram_start_pfn;
 231         phys_addr_t memory_start, memory_end;
 232         struct memblock_region *region;
 233
 234         memory_end = memory_start = 0;
 235
 236         /* Find main memory where is the kernel */
 237         for_each_memblock(memory, region) {
 238                 memory_start = region->base;
 239                 memory_end = region->base + region->size;
 240                 pr_info("%s: Memory: 0x%x-0x%x\n", __func__,
 241                         memory_start, memory_end);
 242         }
 243
 244         if (!memory_end) {
 245                 panic("No memory!");
 246         }
 247
 248         ram_start_pfn = PFN_UP(memblock_start_of_DRAM());
 249         /* free_ram_start_pfn is first page after kernel */
 250         free_ram_start_pfn = PFN_UP(__pa(&_end));
 251         max_pfn = PFN_DOWN(memblock_end_of_DRAM());
 252         /* it could update max_pfn */
 253         if (max_pfn - ram_start_pfn <= MAXMEM_PFN)
 254                 max_low_pfn = max_pfn;
 255         else {
 256                 max_low_pfn = MAXMEM_PFN + ram_start_pfn;
 257                 if (!IS_ENABLED(CONFIG_HIGHMEM))
 258                         max_pfn = MAXMEM_PFN + ram_start_pfn;
 259         }
 260         /* high_memory is related with VMALLOC */
 261         high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);
 262         min_low_pfn = free_ram_start_pfn;
 263
 264         /*
 265          * initialize the boot-time allocator (with low memory only).
 266          *
 267          * This makes the memory from the end of the kernel to the end of
 268          * RAM usable.
 269          */
 270         memblock_set_bottom_up(true);
 271         memblock_reserve(PFN_PHYS(ram_start_pfn), PFN_PHYS(free_ram_start_pfn - ram_start_pfn));
 272
 273         early_init_fdt_reserve_self();
 274         early_init_fdt_scan_reserved_mem();
 275
 276         memblock_dump_all();
 277 }
 278
 279 void __init setup_arch(char **cmdline_p)
 280 {
 281         early_init_devtree(__atags_pointer ? \
 282                 phys_to_virt(__atags_pointer) : __dtb_start);
 283
 284         setup_cpuinfo();
 285
 286         init_mm.start_code = (unsigned long)&_stext;
 287         init_mm.end_code = (unsigned long)&_etext;
 288         init_mm.end_data = (unsigned long)&_edata;
 289         init_mm.brk = (unsigned long)&_end;
 290
 291         /* setup bootmem allocator */
 292         setup_memory();
 293
 294         /* paging_init() sets up the MMU and marks all pages as reserved */
 295         paging_init();
 296
 297         /* invalidate all TLB entries because the new mapping is created */
 298         __nds32__tlbop_flua();
 299
 300         /* use generic way to parse */
 301         parse_early_param();
 302
 303         unflatten_and_copy_device_tree();
 304
 305         if(IS_ENABLED(CONFIG_VT)) {
 306                 if(IS_ENABLED(CONFIG_DUMMY_CONSOLE))
 307                         conswitchp = &dummy_con;
 308         }
 309
 310         *cmdline_p = boot_command_line;
 311         early_trap_init();
 312 }
 313
 314 static int c_show(struct seq_file *m, void *v)
 315 {
 316         int i;
 317
 318         seq_printf(m, "Processor\t: %c%ld (id %lu, rev %lu, cfg %lu)\n",
 319                    cpu_series, cpu_id, cpu_id, cpu_rev, cpu_cfgid);
 320
 321         seq_printf(m, "L1I\t\t: %luKB/%luS/%luW/%luB\n",
 322                    CACHE_SET(ICACHE) * CACHE_WAY(ICACHE) *
 323                    CACHE_LINE_SIZE(ICACHE) / 1024, CACHE_SET(ICACHE),
 324                    CACHE_WAY(ICACHE), CACHE_LINE_SIZE(ICACHE));
 325
 326         seq_printf(m, "L1D\t\t: %luKB/%luS/%luW/%luB\n",
 327                    CACHE_SET(DCACHE) * CACHE_WAY(DCACHE) *
 328                    CACHE_LINE_SIZE(DCACHE) / 1024, CACHE_SET(DCACHE),
 329                    CACHE_WAY(DCACHE), CACHE_LINE_SIZE(DCACHE));
 330
 331         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 332                    loops_per_jiffy / (500000 / HZ),
 333                    (loops_per_jiffy / (5000 / HZ)) % 100);
 334
 335         /* dump out the processor features */
 336         seq_puts(m, "Features\t: ");
 337
 338         for (i = 0; hwcap_str[i]; i++)
 339                 if (elf_hwcap & (1 << i))
 340                         seq_printf(m, "%s ", hwcap_str[i]);
 341
 342         seq_puts(m, "\n\n");
 343
 344         return 0;
 345 }
 346
 347 static void *c_start(struct seq_file *m, loff_t * pos)
 348 {
 349         return *pos < 1 ? (void *)1 : NULL;
 350 }
 351
 352 static void *c_next(struct seq_file *m, void *v, loff_t * pos)
 353 {
 354         ++*pos;
 355         return NULL;
 356 }
 357
 358 static void c_stop(struct seq_file *m, void *v)
 359 {
 360 }
 361
 362 struct seq_operations cpuinfo_op = {
 363         .start = c_start,
 364         .next = c_next,
 365         .stop = c_stop,
 366         .show = c_show
 367 };