1 /*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9 #include <linux/seq_file.h>
10 #include <linux/fs.h>
11 #include <linux/delay.h>
12 #include <linux/root_dev.h>
13 #include <linux/console.h>
14 #include <linux/module.h>
15 #include <linux/cpu.h>
16 #include <linux/clk-provider.h>
17 #include <linux/of_fdt.h>
18 #include <linux/of_platform.h>
19 #include <linux/cache.h>
20 #include <asm/sections.h>
21 #include <asm/arcregs.h>
22 #include <asm/tlb.h>
23 #include <asm/setup.h>
24 #include <asm/page.h>
25 #include <asm/irq.h>
26 #include <asm/unwind.h>
27 #include <asm/clk.h>
28 #include <asm/mach_desc.h>
29 #include <asm/smp.h>
30
31 #define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x))
32
33 /* Part of U-boot ABI: see head.S */
34 int __initdata uboot_tag;
35 char __initdata *uboot_arg;
36
37 const struct machine_desc *machine_desc;
38
39 struct task_struct *_current_task[NR_CPUS]; /* For stack switching */
40
41 struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
42
read_arc_build_cfg_regs(void)43 static void read_arc_build_cfg_regs(void)
44 {
45 struct bcr_perip uncached_space;
46 struct bcr_generic bcr;
47 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
48 FIX_PTR(cpu);
49
50 READ_BCR(AUX_IDENTITY, cpu->core);
51 READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa);
52
53 READ_BCR(ARC_REG_TIMERS_BCR, cpu->timers);
54 cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
55
56 READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space);
57 cpu->uncached_base = uncached_space.start << 24;
58
59 READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy);
60
61 cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR) > 1 ? 1 : 0; /* 2,3 */
62 cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR) > 1 ? 1 : 0; /* 2,3 */
63 cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR) ? 1 : 0; /* 1,3 */
64 cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR) ? 1 : 0;
65 cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR) > 1 ? 1 : 0; /* 2 */
66
67 /* Note that we read the CCM BCRs independent of kernel config
68 * This is to catch the cases where user doesn't know that
69 * CCMs are present in hardware build
70 */
71 {
72 struct bcr_iccm iccm;
73 struct bcr_dccm dccm;
74 struct bcr_dccm_base dccm_base;
75 unsigned int bcr_32bit_val;
76
77 bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR);
78 if (bcr_32bit_val) {
79 iccm = *((struct bcr_iccm *)&bcr_32bit_val);
80 cpu->iccm.base_addr = iccm.base << 16;
81 cpu->iccm.sz = 0x2000 << (iccm.sz - 1);
82 }
83
84 bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR);
85 if (bcr_32bit_val) {
86 dccm = *((struct bcr_dccm *)&bcr_32bit_val);
87 cpu->dccm.sz = 0x800 << (dccm.sz);
88
89 READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base);
90 cpu->dccm.base_addr = dccm_base.addr << 8;
91 }
92 }
93
94 READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
95
96 read_decode_mmu_bcr();
97 read_decode_cache_bcr();
98
99 {
100 struct bcr_fp_arcompact sp, dp;
101 struct bcr_bpu_arcompact bpu;
102
103 READ_BCR(ARC_REG_FP_BCR, sp);
104 READ_BCR(ARC_REG_DPFP_BCR, dp);
105 cpu->extn.fpu_sp = sp.ver ? 1 : 0;
106 cpu->extn.fpu_dp = dp.ver ? 1 : 0;
107
108 READ_BCR(ARC_REG_BPU_BCR, bpu);
109 cpu->bpu.ver = bpu.ver;
110 cpu->bpu.full = bpu.fam ? 1 : 0;
111 if (bpu.ent) {
112 cpu->bpu.num_cache = 256 << (bpu.ent - 1);
113 cpu->bpu.num_pred = 256 << (bpu.ent - 1);
114 }
115 }
116
117 READ_BCR(ARC_REG_AP_BCR, bcr);
118 cpu->extn.ap = bcr.ver ? 1 : 0;
119
120 READ_BCR(ARC_REG_SMART_BCR, bcr);
121 cpu->extn.smart = bcr.ver ? 1 : 0;
122
123 READ_BCR(ARC_REG_RTT_BCR, bcr);
124 cpu->extn.rtt = bcr.ver ? 1 : 0;
125
126 cpu->extn.debug = cpu->extn.ap | cpu->extn.smart | cpu->extn.rtt;
127 }
128
129 static const struct cpuinfo_data arc_cpu_tbl[] = {
130 { {0x20, "ARC 600" }, 0x2F},
131 { {0x30, "ARC 700" }, 0x33},
132 { {0x34, "ARC 700 R4.10"}, 0x34},
133 { {0x35, "ARC 700 R4.11"}, 0x35},
134 { {0x00, NULL } }
135 };
136
137 #define IS_AVAIL1(v, str) ((v) ? str : "")
138 #define IS_USED(cfg) (IS_ENABLED(cfg) ? "" : "(not used) ")
139 #define IS_AVAIL2(v, str, cfg) IS_AVAIL1(v, str), IS_AVAIL1(v, IS_USED(cfg))
140
arc_cpu_mumbojumbo(int cpu_id,char * buf,int len)141 static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
142 {
143 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
144 struct bcr_identity *core = &cpu->core;
145 const struct cpuinfo_data *tbl;
146 char *isa_nm;
147 int i, be, atomic;
148 int n = 0;
149
150 FIX_PTR(cpu);
151
152 {
153 isa_nm = "ARCompact";
154 be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
155
156 atomic = cpu->isa.atomic1;
157 if (!cpu->isa.ver) /* ISA BCR absent, use Kconfig info */
158 atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
159 }
160
161 n += scnprintf(buf + n, len - n,
162 "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
163 core->family, core->cpu_id, core->chip_id);
164
165 for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
166 if ((core->family >= tbl->info.id) &&
167 (core->family <= tbl->up_range)) {
168 n += scnprintf(buf + n, len - n,
169 "processor [%d]\t: %s (%s ISA) %s\n",
170 cpu_id, tbl->info.str, isa_nm,
171 IS_AVAIL1(be, "[Big-Endian]"));
172 break;
173 }
174 }
175
176 if (tbl->info.id == 0)
177 n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
178
179 n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n",
180 (unsigned int)(arc_get_core_freq() / 1000000),
181 (unsigned int)(arc_get_core_freq() / 10000) % 100);
182
183 n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s\nISA Extn\t: ",
184 IS_AVAIL1(cpu->timers.t0, "Timer0 "),
185 IS_AVAIL1(cpu->timers.t1, "Timer1 "),
186 IS_AVAIL2(cpu->timers.rtsc, "64-bit RTSC ", CONFIG_ARC_HAS_RTSC));
187
188 n += i = scnprintf(buf + n, len - n, "%s%s",
189 IS_AVAIL2(atomic, "atomic ", CONFIG_ARC_HAS_LLSC));
190
191 if (i)
192 n += scnprintf(buf + n, len - n, "\n\t\t: ");
193
194 n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
195 IS_AVAIL1(cpu->extn_mpy.ver, "mpy "),
196 IS_AVAIL1(cpu->extn.norm, "norm "),
197 IS_AVAIL1(cpu->extn.barrel, "barrel-shift "),
198 IS_AVAIL1(cpu->extn.swap, "swap "),
199 IS_AVAIL1(cpu->extn.minmax, "minmax "),
200 IS_AVAIL1(cpu->extn.crc, "crc "),
201 IS_AVAIL2(1, "swape", CONFIG_ARC_HAS_SWAPE));
202
203 if (cpu->bpu.ver)
204 n += scnprintf(buf + n, len - n,
205 "BPU\t\t: %s%s match, cache:%d, Predict Table:%d\n",
206 IS_AVAIL1(cpu->bpu.full, "full"),
207 IS_AVAIL1(!cpu->bpu.full, "partial"),
208 cpu->bpu.num_cache, cpu->bpu.num_pred);
209
210 return buf;
211 }
212
arc_extn_mumbojumbo(int cpu_id,char * buf,int len)213 static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
214 {
215 int n = 0;
216 struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
217
218 FIX_PTR(cpu);
219
220 n += scnprintf(buf + n, len - n,
221 "Vector Table\t: %#x\nUncached Base\t: %#x\n",
222 cpu->vec_base, cpu->uncached_base);
223
224 if (cpu->extn.fpu_sp || cpu->extn.fpu_dp)
225 n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
226 IS_AVAIL1(cpu->extn.fpu_sp, "SP "),
227 IS_AVAIL1(cpu->extn.fpu_dp, "DP "));
228
229 if (cpu->extn.debug)
230 n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s%s\n",
231 IS_AVAIL1(cpu->extn.ap, "ActionPoint "),
232 IS_AVAIL1(cpu->extn.smart, "smaRT "),
233 IS_AVAIL1(cpu->extn.rtt, "RTT "));
234
235 if (cpu->dccm.sz || cpu->iccm.sz)
236 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
237 cpu->dccm.base_addr, TO_KB(cpu->dccm.sz),
238 cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
239
240 n += scnprintf(buf + n, len - n,
241 "OS ABI [v3]\t: no-legacy-syscalls\n");
242
243 return buf;
244 }
245
arc_chk_core_config(void)246 static void arc_chk_core_config(void)
247 {
248 struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
249 int fpu_enabled;
250
251 if (!cpu->timers.t0)
252 panic("Timer0 is not present!\n");
253
254 if (!cpu->timers.t1)
255 panic("Timer1 is not present!\n");
256
257 if (IS_ENABLED(CONFIG_ARC_HAS_RTSC) && !cpu->timers.rtsc)
258 panic("RTSC is not present\n");
259
260 #ifdef CONFIG_ARC_HAS_DCCM
261 /*
262 * DCCM can be arbit placed in hardware.
263 * Make sure it's placement/sz matches what Linux is built with
264 */
265 if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
266 panic("Linux built with incorrect DCCM Base address\n");
267
268 if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
269 panic("Linux built with incorrect DCCM Size\n");
270 #endif
271
272 #ifdef CONFIG_ARC_HAS_ICCM
273 if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
274 panic("Linux built with incorrect ICCM Size\n");
275 #endif
276
277 /*
278 * FP hardware/software config sanity
279 * -If hardware contains DPFP, kernel needs to save/restore FPU state
280 * -If not, it will crash trying to save/restore the non-existant regs
281 *
282 * (only DPDP checked since SP has no arch visible regs)
283 */
284 fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
285
286 if (cpu->extn.fpu_dp && !fpu_enabled)
287 pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
288 else if (!cpu->extn.fpu_dp && fpu_enabled)
289 panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");
290 }
291
292 /*
293 * Initialize and setup the processor core
294 * This is called by all the CPUs thus should not do special case stuff
295 * such as only for boot CPU etc
296 */
297
setup_processor(void)298 void setup_processor(void)
299 {
300 char str[512];
301 int cpu_id = smp_processor_id();
302
303 read_arc_build_cfg_regs();
304 arc_init_IRQ();
305
306 printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
307
308 arc_mmu_init();
309 arc_cache_init();
310
311 printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
312 printk(arc_platform_smp_cpuinfo());
313
314 arc_chk_core_config();
315 }
316
is_kernel(unsigned long addr)317 static inline int is_kernel(unsigned long addr)
318 {
319 if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
320 return 1;
321 return 0;
322 }
323
setup_arch(char ** cmdline_p)324 void __init setup_arch(char **cmdline_p)
325 {
326 /* make sure that uboot passed pointer to cmdline/dtb is valid */
327 if (uboot_tag && is_kernel((unsigned long)uboot_arg))
328 panic("Invalid uboot arg\n");
329
330 /* See if u-boot passed an external Device Tree blob */
331 machine_desc = setup_machine_fdt(uboot_arg); /* uboot_tag == 2 */
332 if (!machine_desc) {
333 /* No, so try the embedded one */
334 machine_desc = setup_machine_fdt(__dtb_start);
335 if (!machine_desc)
336 panic("Embedded DT invalid\n");
337
338 /*
339 * If we are here, it is established that @uboot_arg didn't
340 * point to DT blob. Instead if u-boot says it is cmdline,
341 * Appent to embedded DT cmdline.
342 * setup_machine_fdt() would have populated @boot_command_line
343 */
344 if (uboot_tag == 1) {
345 /* Ensure a whitespace between the 2 cmdlines */
346 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
347 strlcat(boot_command_line, uboot_arg,
348 COMMAND_LINE_SIZE);
349 }
350 }
351
352 /* Save unparsed command line copy for /proc/cmdline */
353 *cmdline_p = boot_command_line;
354
355 /* To force early parsing of things like mem=xxx */
356 parse_early_param();
357
358 /* Platform/board specific: e.g. early console registration */
359 if (machine_desc->init_early)
360 machine_desc->init_early();
361
362 setup_processor();
363 smp_init_cpus();
364 setup_arch_memory();
365
366 /* copy flat DT out of .init and then unflatten it */
367 unflatten_and_copy_device_tree();
368
369 /* Can be issue if someone passes cmd line arg "ro"
370 * But that is unlikely so keeping it as it is
371 */
372 root_mountflags &= ~MS_RDONLY;
373
374 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
375 conswitchp = &dummy_con;
376 #endif
377
378 arc_unwind_init();
379 arc_unwind_setup();
380 }
381
customize_machine(void)382 static int __init customize_machine(void)
383 {
384 of_clk_init(NULL);
385 /*
386 * Traverses flattened DeviceTree - registering platform devices
387 * (if any) complete with their resources
388 */
389 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
390
391 if (machine_desc->init_machine)
392 machine_desc->init_machine();
393
394 return 0;
395 }
396 arch_initcall(customize_machine);
397
init_late_machine(void)398 static int __init init_late_machine(void)
399 {
400 if (machine_desc->init_late)
401 machine_desc->init_late();
402
403 return 0;
404 }
405 late_initcall(init_late_machine);
406 /*
407 * Get CPU information for use by the procfs.
408 */
409
410 #define cpu_to_ptr(c) ((void *)(0xFFFF0000 | (unsigned int)(c)))
411 #define ptr_to_cpu(p) (~0xFFFF0000UL & (unsigned int)(p))
412
show_cpuinfo(struct seq_file * m,void * v)413 static int show_cpuinfo(struct seq_file *m, void *v)
414 {
415 char *str;
416 int cpu_id = ptr_to_cpu(v);
417
418 if (!cpu_online(cpu_id)) {
419 seq_printf(m, "processor [%d]\t: Offline\n", cpu_id);
420 goto done;
421 }
422
423 str = (char *)__get_free_page(GFP_TEMPORARY);
424 if (!str)
425 goto done;
426
427 seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
428
429 seq_printf(m, "Bogo MIPS\t: %lu.%02lu\n",
430 loops_per_jiffy / (500000 / HZ),
431 (loops_per_jiffy / (5000 / HZ)) % 100);
432
433 seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
434 seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
435 seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
436 seq_printf(m, arc_platform_smp_cpuinfo());
437
438 free_page((unsigned long)str);
439 done:
440 seq_printf(m, "\n");
441
442 return 0;
443 }
444
c_start(struct seq_file * m,loff_t * pos)445 static void *c_start(struct seq_file *m, loff_t *pos)
446 {
447 /*
448 * Callback returns cpu-id to iterator for show routine, NULL to stop.
449 * However since NULL is also a valid cpu-id (0), we use a round-about
450 * way to pass it w/o having to kmalloc/free a 2 byte string.
451 * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
452 */
453 return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
454 }
455
c_next(struct seq_file * m,void * v,loff_t * pos)456 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
457 {
458 ++*pos;
459 return c_start(m, pos);
460 }
461
c_stop(struct seq_file * m,void * v)462 static void c_stop(struct seq_file *m, void *v)
463 {
464 }
465
466 const struct seq_operations cpuinfo_op = {
467 .start = c_start,
468 .next = c_next,
469 .stop = c_stop,
470 .show = show_cpuinfo
471 };
472
473 static DEFINE_PER_CPU(struct cpu, cpu_topology);
474
topology_init(void)475 static int __init topology_init(void)
476 {
477 int cpu;
478
479 for_each_present_cpu(cpu)
480 register_cpu(&per_cpu(cpu_topology, cpu), cpu);
481
482 return 0;
483 }
484
485 subsys_initcall(topology_init);
486