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];
dump_cpu_info(int cpu)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
setup_cpuinfo(void)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
setup_memory(void)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 memory_start = memblock_start_of_DRAM();
253 memory_end = memblock_end_of_DRAM();
254
255 if (!memory_end) {
256 panic("No memory!");
257 }
258
259 ram_start_pfn = PFN_UP(memblock_start_of_DRAM());
260 /* free_ram_start_pfn is first page after kernel */
261 free_ram_start_pfn = PFN_UP(__pa(&_end));
262 max_pfn = PFN_DOWN(memblock_end_of_DRAM());
263 /* it could update max_pfn */
264 if (max_pfn - ram_start_pfn <= MAXMEM_PFN)
265 max_low_pfn = max_pfn;
266 else {
267 max_low_pfn = MAXMEM_PFN + ram_start_pfn;
268 if (!IS_ENABLED(CONFIG_HIGHMEM))
269 max_pfn = MAXMEM_PFN + ram_start_pfn;
270 }
271 /* high_memory is related with VMALLOC */
272 high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);
273 min_low_pfn = free_ram_start_pfn;
274
275 /*
276 * initialize the boot-time allocator (with low memory only).
277 *
278 * This makes the memory from the end of the kernel to the end of
279 * RAM usable.
280 */
281 memblock_set_bottom_up(true);
282 memblock_reserve(PFN_PHYS(ram_start_pfn), PFN_PHYS(free_ram_start_pfn - ram_start_pfn));
283
284 early_init_fdt_reserve_self();
285 early_init_fdt_scan_reserved_mem();
286
287 memblock_dump_all();
288 }
289
setup_arch(char ** cmdline_p)290 void __init setup_arch(char **cmdline_p)
291 {
292 early_init_devtree(__atags_pointer ? \
293 phys_to_virt(__atags_pointer) : __dtb_start);
294
295 setup_cpuinfo();
296
297 init_mm.start_code = (unsigned long)&_stext;
298 init_mm.end_code = (unsigned long)&_etext;
299 init_mm.end_data = (unsigned long)&_edata;
300 init_mm.brk = (unsigned long)&_end;
301
302 /* setup bootmem allocator */
303 setup_memory();
304
305 /* paging_init() sets up the MMU and marks all pages as reserved */
306 paging_init();
307
308 /* invalidate all TLB entries because the new mapping is created */
309 __nds32__tlbop_flua();
310
311 /* use generic way to parse */
312 parse_early_param();
313
314 unflatten_and_copy_device_tree();
315
316 *cmdline_p = boot_command_line;
317 early_trap_init();
318 }
319
c_show(struct seq_file * m,void * v)320 static int c_show(struct seq_file *m, void *v)
321 {
322 int i;
323
324 seq_printf(m, "Processor\t: %c%ld (id %lu, rev %lu, cfg %lu)\n",
325 cpu_series, cpu_id, cpu_id, cpu_rev, cpu_cfgid);
326
327 seq_printf(m, "L1I\t\t: %luKB/%luS/%luW/%luB\n",
328 CACHE_SET(ICACHE) * CACHE_WAY(ICACHE) *
329 CACHE_LINE_SIZE(ICACHE) / 1024, CACHE_SET(ICACHE),
330 CACHE_WAY(ICACHE), CACHE_LINE_SIZE(ICACHE));
331
332 seq_printf(m, "L1D\t\t: %luKB/%luS/%luW/%luB\n",
333 CACHE_SET(DCACHE) * CACHE_WAY(DCACHE) *
334 CACHE_LINE_SIZE(DCACHE) / 1024, CACHE_SET(DCACHE),
335 CACHE_WAY(DCACHE), CACHE_LINE_SIZE(DCACHE));
336
337 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
338 loops_per_jiffy / (500000 / HZ),
339 (loops_per_jiffy / (5000 / HZ)) % 100);
340
341 /* dump out the processor features */
342 seq_puts(m, "Features\t: ");
343
344 for (i = 0; hwcap_str[i]; i++)
345 if (elf_hwcap & (1 << i))
346 seq_printf(m, "%s ", hwcap_str[i]);
347
348 seq_puts(m, "\n\n");
349
350 return 0;
351 }
352
c_start(struct seq_file * m,loff_t * pos)353 static void *c_start(struct seq_file *m, loff_t * pos)
354 {
355 return *pos < 1 ? (void *)1 : NULL;
356 }
357
c_next(struct seq_file * m,void * v,loff_t * pos)358 static void *c_next(struct seq_file *m, void *v, loff_t * pos)
359 {
360 ++*pos;
361 return NULL;
362 }
363
c_stop(struct seq_file * m,void * v)364 static void c_stop(struct seq_file *m, void *v)
365 {
366 }
367
368 struct seq_operations cpuinfo_op = {
369 .start = c_start,
370 .next = c_next,
371 .stop = c_stop,
372 .show = c_show
373 };
374