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/memblock.h>
   6 #include <linux/seq_file.h>
   7 #include <linux/console.h>
   8 #include <linux/screen_info.h>
   9 #include <linux/delay.h>
  10 #include <linux/dma-mapping.h>
  11 #include <linux/of_fdt.h>
  12 #include <linux/of_platform.h>
  13 #include <asm/setup.h>
  14 #include <asm/sections.h>
  15 #include <asm/proc-fns.h>
  16 #include <asm/cache_info.h>
  17 #include <asm/elf.h>
  18 #include <asm/fpu.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 #define HWCAP_HWPRE             0x200000
  43
  44 unsigned long cpu_id, cpu_rev, cpu_cfgid;
  45 bool has_fpu = false;
  46 char cpu_series;
  47 char *endianness = NULL;
  48
  49 unsigned int __atags_pointer __initdata;
  50 unsigned int elf_hwcap;
  51 EXPORT_SYMBOL(elf_hwcap);
  52
  53 /*
  54  * The following string table, must sync with HWCAP_xx bitmask,
  55  * which is defined in <asm/procinfo.h>
  56  */
  57 static const char *hwcap_str[] = {
  58         "mfusr_pc",
  59         "perf1",
  60         "perf2",
  61         "fpu",
  62         "audio",
  63         "16b",
  64         "string",
  65         "reduced_regs",
  66         "video",
  67         "encrypt",
  68         "edm",
  69         "lmdma",
  70         "pfm",
  71         "hsmp",
  72         "trace",
  73         "div",
  74         "mac",
  75         "l2c",
  76         "fpu_dp",
  77         "v2",
  78         "dx_regs",
  79         "hw_pre",
  80         NULL,
  81 };
  82
  83 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
  84 #define WRITE_METHOD "write through"
  85 #else
  86 #define WRITE_METHOD "write back"
  87 #endif
  88
  89 struct cache_info L1_cache_info[2];
  90 static void __init dump_cpu_info(int cpu)
  91 {
  92         int i, p = 0;
  93         char str[sizeof(hwcap_str) + 16];
  94
  95         for (i = 0; hwcap_str[i]; i++) {
  96                 if (elf_hwcap & (1 << i)) {
  97                         sprintf(str + p, "%s ", hwcap_str[i]);
  98                         p += strlen(hwcap_str[i]) + 1;
  99                 }
 100         }
 101
 102         pr_info("CPU%d Features: %s\n", cpu, str);
 103
 104         L1_cache_info[ICACHE].ways = CACHE_WAY(ICACHE);
 105         L1_cache_info[ICACHE].line_size = CACHE_LINE_SIZE(ICACHE);
 106         L1_cache_info[ICACHE].sets = CACHE_SET(ICACHE);
 107         L1_cache_info[ICACHE].size =
 108             L1_cache_info[ICACHE].ways * L1_cache_info[ICACHE].line_size *
 109             L1_cache_info[ICACHE].sets / 1024;
 110         pr_info("L1I:%dKB/%dS/%dW/%dB\n", L1_cache_info[ICACHE].size,
 111                 L1_cache_info[ICACHE].sets, L1_cache_info[ICACHE].ways,
 112                 L1_cache_info[ICACHE].line_size);
 113         L1_cache_info[DCACHE].ways = CACHE_WAY(DCACHE);
 114         L1_cache_info[DCACHE].line_size = CACHE_LINE_SIZE(DCACHE);
 115         L1_cache_info[DCACHE].sets = CACHE_SET(DCACHE);
 116         L1_cache_info[DCACHE].size =
 117             L1_cache_info[DCACHE].ways * L1_cache_info[DCACHE].line_size *
 118             L1_cache_info[DCACHE].sets / 1024;
 119         pr_info("L1D:%dKB/%dS/%dW/%dB\n", L1_cache_info[DCACHE].size,
 120                 L1_cache_info[DCACHE].sets, L1_cache_info[DCACHE].ways,
 121                 L1_cache_info[DCACHE].line_size);
 122         pr_info("L1 D-Cache is %s\n", WRITE_METHOD);
 123         if (L1_cache_info[DCACHE].size != L1_CACHE_BYTES)
 124                 pr_crit
 125                     ("The cache line size(%d) of this processor is not the same as L1_CACHE_BYTES(%d).\n",
 126                      L1_cache_info[DCACHE].size, L1_CACHE_BYTES);
 127 #ifdef CONFIG_CPU_CACHE_ALIASING
 128         {
 129                 int aliasing_num;
 130                 aliasing_num =
 131                     L1_cache_info[ICACHE].size * 1024 / PAGE_SIZE /
 132                     L1_cache_info[ICACHE].ways;
 133                 L1_cache_info[ICACHE].aliasing_num = aliasing_num;
 134                 L1_cache_info[ICACHE].aliasing_mask =
 135                     (aliasing_num - 1) << PAGE_SHIFT;
 136                 aliasing_num =
 137                     L1_cache_info[DCACHE].size * 1024 / PAGE_SIZE /
 138                     L1_cache_info[DCACHE].ways;
 139                 L1_cache_info[DCACHE].aliasing_num = aliasing_num;
 140                 L1_cache_info[DCACHE].aliasing_mask =
 141                     (aliasing_num - 1) << PAGE_SHIFT;
 142         }
 143 #endif
 144 #ifdef CONFIG_FPU
 145         /* Disable fpu and enable when it is used. */
 146         if (has_fpu)
 147                 disable_fpu();
 148 #endif
 149 }
 150
 151 static void __init setup_cpuinfo(void)
 152 {
 153         unsigned long tmp = 0, cpu_name;
 154
 155         cpu_dcache_inval_all();
 156         cpu_icache_inval_all();
 157         __nds32__isb();
 158
 159         cpu_id = (__nds32__mfsr(NDS32_SR_CPU_VER) & CPU_VER_mskCPUID) >> CPU_VER_offCPUID;
 160         cpu_name = ((cpu_id) & 0xf0) >> 4;
 161         cpu_series = cpu_name ? cpu_name - 10 + 'A' : 'N';
 162         cpu_id = cpu_id & 0xf;
 163         cpu_rev = (__nds32__mfsr(NDS32_SR_CPU_VER) & CPU_VER_mskREV) >> CPU_VER_offREV;
 164         cpu_cfgid = (__nds32__mfsr(NDS32_SR_CPU_VER) & CPU_VER_mskCFGID) >> CPU_VER_offCFGID;
 165
 166         pr_info("CPU:%c%ld, CPU_VER 0x%08x(id %lu, rev %lu, cfg %lu)\n",
 167                 cpu_series, cpu_id, __nds32__mfsr(NDS32_SR_CPU_VER), cpu_id, cpu_rev, cpu_cfgid);
 168
 169         elf_hwcap |= HWCAP_MFUSR_PC;
 170
 171         if (((__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskBASEV) >> MSC_CFG_offBASEV) == 0) {
 172                 if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskDIV)
 173                         elf_hwcap |= HWCAP_DIV;
 174
 175                 if ((__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskMAC)
 176                     || (cpu_id == 12 && cpu_rev < 4))
 177                         elf_hwcap |= HWCAP_MAC;
 178         } else {
 179                 elf_hwcap |= HWCAP_V2;
 180                 elf_hwcap |= HWCAP_DIV;
 181                 elf_hwcap |= HWCAP_MAC;
 182         }
 183
 184         if (cpu_cfgid & 0x0001)
 185                 elf_hwcap |= HWCAP_EXT;
 186
 187         if (cpu_cfgid & 0x0002)
 188                 elf_hwcap |= HWCAP_BASE16;
 189
 190         if (cpu_cfgid & 0x0004)
 191                 elf_hwcap |= HWCAP_EXT2;
 192
 193         if (cpu_cfgid & 0x0008) {
 194                 elf_hwcap |= HWCAP_FPU;
 195                 has_fpu = true;
 196         }
 197         if (cpu_cfgid & 0x0010)
 198                 elf_hwcap |= HWCAP_STRING;
 199
 200         if (__nds32__mfsr(NDS32_SR_MMU_CFG) & MMU_CFG_mskDE)
 201                 endianness = "MSB";
 202         else
 203                 endianness = "LSB";
 204
 205         if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskEDM)
 206                 elf_hwcap |= HWCAP_EDM;
 207
 208         if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskLMDMA)
 209                 elf_hwcap |= HWCAP_LMDMA;
 210
 211         if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskPFM)
 212                 elf_hwcap |= HWCAP_PFM;
 213
 214         if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskHSMP)
 215                 elf_hwcap |= HWCAP_HSMP;
 216
 217         if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskTRACE)
 218                 elf_hwcap |= HWCAP_TRACE;
 219
 220         if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskAUDIO)
 221                 elf_hwcap |= HWCAP_AUDIO;
 222
 223         if (__nds32__mfsr(NDS32_SR_MSC_CFG) & MSC_CFG_mskL2C)
 224                 elf_hwcap |= HWCAP_L2C;
 225
 226 #ifdef CONFIG_HW_PRE
 227         if (__nds32__mfsr(NDS32_SR_MISC_CTL) & MISC_CTL_makHWPRE_EN)
 228                 elf_hwcap |= HWCAP_HWPRE;
 229 #endif
 230
 231         tmp = __nds32__mfsr(NDS32_SR_CACHE_CTL);
 232         if (!IS_ENABLED(CONFIG_CPU_DCACHE_DISABLE))
 233                 tmp |= CACHE_CTL_mskDC_EN;
 234
 235         if (!IS_ENABLED(CONFIG_CPU_ICACHE_DISABLE))
 236                 tmp |= CACHE_CTL_mskIC_EN;
 237         __nds32__mtsr_isb(tmp, NDS32_SR_CACHE_CTL);
 238
 239         dump_cpu_info(smp_processor_id());
 240 }
 241
 242 static void __init setup_memory(void)
 243 {
 244         unsigned long ram_start_pfn;
 245         unsigned long free_ram_start_pfn;
 246         phys_addr_t memory_start, memory_end;
 247         struct memblock_region *region;
 248
 249         memory_end = memory_start = 0;
 250
 251         /* Find main memory where is the kernel */
 252         for_each_memblock(memory, region) {
 253                 memory_start = region->base;
 254                 memory_end = region->base + region->size;
 255                 pr_info("%s: Memory: 0x%x-0x%x\n", __func__,
 256                         memory_start, memory_end);
 257         }
 258
 259         if (!memory_end) {
 260                 panic("No memory!");
 261         }
 262
 263         ram_start_pfn = PFN_UP(memblock_start_of_DRAM());
 264         /* free_ram_start_pfn is first page after kernel */
 265         free_ram_start_pfn = PFN_UP(__pa(&_end));
 266         max_pfn = PFN_DOWN(memblock_end_of_DRAM());
 267         /* it could update max_pfn */
 268         if (max_pfn - ram_start_pfn <= MAXMEM_PFN)
 269                 max_low_pfn = max_pfn;
 270         else {
 271                 max_low_pfn = MAXMEM_PFN + ram_start_pfn;
 272                 if (!IS_ENABLED(CONFIG_HIGHMEM))
 273                         max_pfn = MAXMEM_PFN + ram_start_pfn;
 274         }
 275         /* high_memory is related with VMALLOC */
 276         high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);
 277         min_low_pfn = free_ram_start_pfn;
 278
 279         /*
 280          * initialize the boot-time allocator (with low memory only).
 281          *
 282          * This makes the memory from the end of the kernel to the end of
 283          * RAM usable.
 284          */
 285         memblock_set_bottom_up(true);
 286         memblock_reserve(PFN_PHYS(ram_start_pfn), PFN_PHYS(free_ram_start_pfn - ram_start_pfn));
 287
 288         early_init_fdt_reserve_self();
 289         early_init_fdt_scan_reserved_mem();
 290
 291         memblock_dump_all();
 292 }
 293
 294 void __init setup_arch(char **cmdline_p)
 295 {
 296         early_init_devtree(__atags_pointer ? \
 297                 phys_to_virt(__atags_pointer) : __dtb_start);
 298
 299         setup_cpuinfo();
 300
 301         init_mm.start_code = (unsigned long)&_stext;
 302         init_mm.end_code = (unsigned long)&_etext;
 303         init_mm.end_data = (unsigned long)&_edata;
 304         init_mm.brk = (unsigned long)&_end;
 305
 306         /* setup bootmem allocator */
 307         setup_memory();
 308
 309         /* paging_init() sets up the MMU and marks all pages as reserved */
 310         paging_init();
 311
 312         /* invalidate all TLB entries because the new mapping is created */
 313         __nds32__tlbop_flua();
 314
 315         /* use generic way to parse */
 316         parse_early_param();
 317
 318         unflatten_and_copy_device_tree();
 319
 320         *cmdline_p = boot_command_line;
 321         early_trap_init();
 322 }
 323
 324 static int c_show(struct seq_file *m, void *v)
 325 {
 326         int i;
 327
 328         seq_printf(m, "Processor\t: %c%ld (id %lu, rev %lu, cfg %lu)\n",
 329                    cpu_series, cpu_id, cpu_id, cpu_rev, cpu_cfgid);
 330
 331         seq_printf(m, "L1I\t\t: %luKB/%luS/%luW/%luB\n",
 332                    CACHE_SET(ICACHE) * CACHE_WAY(ICACHE) *
 333                    CACHE_LINE_SIZE(ICACHE) / 1024, CACHE_SET(ICACHE),
 334                    CACHE_WAY(ICACHE), CACHE_LINE_SIZE(ICACHE));
 335
 336         seq_printf(m, "L1D\t\t: %luKB/%luS/%luW/%luB\n",
 337                    CACHE_SET(DCACHE) * CACHE_WAY(DCACHE) *
 338                    CACHE_LINE_SIZE(DCACHE) / 1024, CACHE_SET(DCACHE),
 339                    CACHE_WAY(DCACHE), CACHE_LINE_SIZE(DCACHE));
 340
 341         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 342                    loops_per_jiffy / (500000 / HZ),
 343                    (loops_per_jiffy / (5000 / HZ)) % 100);
 344
 345         /* dump out the processor features */
 346         seq_puts(m, "Features\t: ");
 347
 348         for (i = 0; hwcap_str[i]; i++)
 349                 if (elf_hwcap & (1 << i))
 350                         seq_printf(m, "%s ", hwcap_str[i]);
 351
 352         seq_puts(m, "\n\n");
 353
 354         return 0;
 355 }
 356
 357 static void *c_start(struct seq_file *m, loff_t * pos)
 358 {
 359         return *pos < 1 ? (void *)1 : NULL;
 360 }
 361
 362 static void *c_next(struct seq_file *m, void *v, loff_t * pos)
 363 {
 364         ++*pos;
 365         return NULL;
 366 }
 367
 368 static void c_stop(struct seq_file *m, void *v)
 369 {
 370 }
 371
 372 struct seq_operations cpuinfo_op = {
 373         .start = c_start,
 374         .next = c_next,
 375         .stop = c_stop,
 376         .show = c_show
 377 };