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TOMOYO Linux Cross Reference
Linux/arch/arc/kernel/setup.c

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  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/of_fdt.h>
 17 #include <linux/cache.h>
 18 #include <asm/sections.h>
 19 #include <asm/arcregs.h>
 20 #include <asm/tlb.h>
 21 #include <asm/setup.h>
 22 #include <asm/page.h>
 23 #include <asm/irq.h>
 24 #include <asm/prom.h>
 25 #include <asm/unwind.h>
 26 #include <asm/clk.h>
 27 #include <asm/mach_desc.h>
 28 
 29 #define FIX_PTR(x)  __asm__ __volatile__(";" : "+r"(x))
 30 
 31 int running_on_hw = 1;  /* vs. on ISS */
 32 
 33 char __initdata command_line[COMMAND_LINE_SIZE];
 34 struct machine_desc *machine_desc;
 35 
 36 struct task_struct *_current_task[NR_CPUS];     /* For stack switching */
 37 
 38 struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
 39 
 40 
 41 void read_arc_build_cfg_regs(void)
 42 {
 43         struct bcr_perip uncached_space;
 44         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
 45         FIX_PTR(cpu);
 46 
 47         READ_BCR(AUX_IDENTITY, cpu->core);
 48 
 49         cpu->timers = read_aux_reg(ARC_REG_TIMERS_BCR);
 50         cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
 51 
 52         READ_BCR(ARC_REG_D_UNCACH_BCR, uncached_space);
 53         cpu->uncached_base = uncached_space.start << 24;
 54 
 55         cpu->extn.mul = read_aux_reg(ARC_REG_MUL_BCR);
 56         cpu->extn.swap = read_aux_reg(ARC_REG_SWAP_BCR);
 57         cpu->extn.norm = read_aux_reg(ARC_REG_NORM_BCR);
 58         cpu->extn.minmax = read_aux_reg(ARC_REG_MIXMAX_BCR);
 59         cpu->extn.barrel = read_aux_reg(ARC_REG_BARREL_BCR);
 60         READ_BCR(ARC_REG_MAC_BCR, cpu->extn_mac_mul);
 61 
 62         cpu->extn.ext_arith = read_aux_reg(ARC_REG_EXTARITH_BCR);
 63         cpu->extn.crc = read_aux_reg(ARC_REG_CRC_BCR);
 64 
 65         /* Note that we read the CCM BCRs independent of kernel config
 66          * This is to catch the cases where user doesn't know that
 67          * CCMs are present in hardware build
 68          */
 69         {
 70                 struct bcr_iccm iccm;
 71                 struct bcr_dccm dccm;
 72                 struct bcr_dccm_base dccm_base;
 73                 unsigned int bcr_32bit_val;
 74 
 75                 bcr_32bit_val = read_aux_reg(ARC_REG_ICCM_BCR);
 76                 if (bcr_32bit_val) {
 77                         iccm = *((struct bcr_iccm *)&bcr_32bit_val);
 78                         cpu->iccm.base_addr = iccm.base << 16;
 79                         cpu->iccm.sz = 0x2000 << (iccm.sz - 1);
 80                 }
 81 
 82                 bcr_32bit_val = read_aux_reg(ARC_REG_DCCM_BCR);
 83                 if (bcr_32bit_val) {
 84                         dccm = *((struct bcr_dccm *)&bcr_32bit_val);
 85                         cpu->dccm.sz = 0x800 << (dccm.sz);
 86 
 87                         READ_BCR(ARC_REG_DCCMBASE_BCR, dccm_base);
 88                         cpu->dccm.base_addr = dccm_base.addr << 8;
 89                 }
 90         }
 91 
 92         READ_BCR(ARC_REG_XY_MEM_BCR, cpu->extn_xymem);
 93 
 94         read_decode_mmu_bcr();
 95         read_decode_cache_bcr();
 96 
 97         READ_BCR(ARC_REG_FP_BCR, cpu->fp);
 98         READ_BCR(ARC_REG_DPFP_BCR, cpu->dpfp);
 99 }
100 
101 static const struct cpuinfo_data arc_cpu_tbl[] = {
102         { {0x10, "ARCTangent A5"}, 0x1F},
103         { {0x20, "ARC 600"      }, 0x2F},
104         { {0x30, "ARC 700"      }, 0x33},
105         { {0x34, "ARC 700 R4.10"}, 0x34},
106         { {0x00, NULL           } }
107 };
108 
109 char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
110 {
111         int n = 0;
112         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
113         struct bcr_identity *core = &cpu->core;
114         const struct cpuinfo_data *tbl;
115         int be = 0;
116 #ifdef CONFIG_CPU_BIG_ENDIAN
117         be = 1;
118 #endif
119         FIX_PTR(cpu);
120 
121         n += scnprintf(buf + n, len - n,
122                        "\nARC IDENTITY\t: Family [%#02x]"
123                        " Cpu-id [%#02x] Chip-id [%#4x]\n",
124                        core->family, core->cpu_id,
125                        core->chip_id);
126 
127         for (tbl = &arc_cpu_tbl[0]; tbl->info.id != 0; tbl++) {
128                 if ((core->family >= tbl->info.id) &&
129                     (core->family <= tbl->up_range)) {
130                         n += scnprintf(buf + n, len - n,
131                                        "processor\t: %s %s\n",
132                                        tbl->info.str,
133                                        be ? "[Big Endian]" : "");
134                         break;
135                 }
136         }
137 
138         if (tbl->info.id == 0)
139                 n += scnprintf(buf + n, len - n, "UNKNOWN ARC Processor\n");
140 
141         n += scnprintf(buf + n, len - n, "CPU speed\t: %u.%02u Mhz\n",
142                        (unsigned int)(arc_get_core_freq() / 1000000),
143                        (unsigned int)(arc_get_core_freq() / 10000) % 100);
144 
145         n += scnprintf(buf + n, len - n, "Timers\t\t: %s %s\n",
146                        (cpu->timers & 0x200) ? "TIMER1" : "",
147                        (cpu->timers & 0x100) ? "TIMER0" : "");
148 
149         n += scnprintf(buf + n, len - n, "Vect Tbl Base\t: %#x\n",
150                        cpu->vec_base);
151 
152         n += scnprintf(buf + n, len - n, "UNCACHED Base\t: %#x\n",
153                        cpu->uncached_base);
154 
155         return buf;
156 }
157 
158 static const struct id_to_str mul_type_nm[] = {
159         { 0x0, "N/A"},
160         { 0x1, "32x32 (spl Result Reg)" },
161         { 0x2, "32x32 (ANY Result Reg)" }
162 };
163 
164 static const struct id_to_str mac_mul_nm[] = {
165         {0x0, "N/A"},
166         {0x1, "N/A"},
167         {0x2, "Dual 16 x 16"},
168         {0x3, "N/A"},
169         {0x4, "32x16"},
170         {0x5, "N/A"},
171         {0x6, "Dual 16x16 and 32x16"}
172 };
173 
174 char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
175 {
176         int n = 0;
177         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
178 
179         FIX_PTR(cpu);
180 #define IS_AVAIL1(var, str)     ((var) ? str : "")
181 #define IS_AVAIL2(var, str)     ((var == 0x2) ? str : "")
182 #define IS_USED(cfg)            (IS_ENABLED(cfg) ? "(in-use)" : "(not used)")
183 
184         n += scnprintf(buf + n, len - n,
185                        "Extn [700-Base]\t: %s %s %s %s %s %s\n",
186                        IS_AVAIL2(cpu->extn.norm, "norm,"),
187                        IS_AVAIL2(cpu->extn.barrel, "barrel-shift,"),
188                        IS_AVAIL1(cpu->extn.swap, "swap,"),
189                        IS_AVAIL2(cpu->extn.minmax, "minmax,"),
190                        IS_AVAIL1(cpu->extn.crc, "crc,"),
191                        IS_AVAIL2(cpu->extn.ext_arith, "ext-arith"));
192 
193         n += scnprintf(buf + n, len - n, "Extn [700-MPY]\t: %s",
194                        mul_type_nm[cpu->extn.mul].str);
195 
196         n += scnprintf(buf + n, len - n, "   MAC MPY: %s\n",
197                        mac_mul_nm[cpu->extn_mac_mul.type].str);
198 
199         if (cpu->core.family == 0x34) {
200                 n += scnprintf(buf + n, len - n,
201                 "Extn [700-4.10]\t: LLOCK/SCOND %s, SWAPE %s, RTSC %s\n",
202                                IS_USED(CONFIG_ARC_HAS_LLSC),
203                                IS_USED(CONFIG_ARC_HAS_SWAPE),
204                                IS_USED(CONFIG_ARC_HAS_RTSC));
205         }
206 
207         n += scnprintf(buf + n, len - n, "Extn [CCM]\t: %s",
208                        !(cpu->dccm.sz || cpu->iccm.sz) ? "N/A" : "");
209 
210         if (cpu->dccm.sz)
211                 n += scnprintf(buf + n, len - n, "DCCM: @ %x, %d KB ",
212                                cpu->dccm.base_addr, TO_KB(cpu->dccm.sz));
213 
214         if (cpu->iccm.sz)
215                 n += scnprintf(buf + n, len - n, "ICCM: @ %x, %d KB",
216                                cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
217 
218         n += scnprintf(buf + n, len - n, "\nExtn [FPU]\t: %s",
219                        !(cpu->fp.ver || cpu->dpfp.ver) ? "N/A" : "");
220 
221         if (cpu->fp.ver)
222                 n += scnprintf(buf + n, len - n, "SP [v%d] %s",
223                                cpu->fp.ver, cpu->fp.fast ? "(fast)" : "");
224 
225         if (cpu->dpfp.ver)
226                 n += scnprintf(buf + n, len - n, "DP [v%d] %s",
227                                cpu->dpfp.ver, cpu->dpfp.fast ? "(fast)" : "");
228 
229         n += scnprintf(buf + n, len - n, "\n");
230 
231         n += scnprintf(buf + n, len - n,
232                        "OS ABI [v3]\t: no-legacy-syscalls\n");
233 
234         return buf;
235 }
236 
237 void arc_chk_ccms(void)
238 {
239 #if defined(CONFIG_ARC_HAS_DCCM) || defined(CONFIG_ARC_HAS_ICCM)
240         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
241 
242 #ifdef CONFIG_ARC_HAS_DCCM
243         /*
244          * DCCM can be arbit placed in hardware.
245          * Make sure it's placement/sz matches what Linux is built with
246          */
247         if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
248                 panic("Linux built with incorrect DCCM Base address\n");
249 
250         if (CONFIG_ARC_DCCM_SZ != cpu->dccm.sz)
251                 panic("Linux built with incorrect DCCM Size\n");
252 #endif
253 
254 #ifdef CONFIG_ARC_HAS_ICCM
255         if (CONFIG_ARC_ICCM_SZ != cpu->iccm.sz)
256                 panic("Linux built with incorrect ICCM Size\n");
257 #endif
258 #endif
259 }
260 
261 /*
262  * Ensure that FP hardware and kernel config match
263  * -If hardware contains DPFP, kernel needs to save/restore FPU state
264  *  across context switches
265  * -If hardware lacks DPFP, but kernel configured to save FPU state then
266  *  kernel trying to access non-existant DPFP regs will crash
267  *
268  * We only check for Dbl precision Floating Point, because only DPFP
269  * hardware has dedicated regs which need to be saved/restored on ctx-sw
270  * (Single Precision uses core regs), thus kernel is kind of oblivious to it
271  */
272 void arc_chk_fpu(void)
273 {
274         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
275 
276         if (cpu->dpfp.ver) {
277 #ifndef CONFIG_ARC_FPU_SAVE_RESTORE
278                 pr_warn("DPFP support broken in this kernel...\n");
279 #endif
280         } else {
281 #ifdef CONFIG_ARC_FPU_SAVE_RESTORE
282                 panic("H/w lacks DPFP support, apps won't work\n");
283 #endif
284         }
285 }
286 
287 /*
288  * Initialize and setup the processor core
289  * This is called by all the CPUs thus should not do special case stuff
290  *    such as only for boot CPU etc
291  */
292 
293 void setup_processor(void)
294 {
295         char str[512];
296         int cpu_id = smp_processor_id();
297 
298         read_arc_build_cfg_regs();
299         arc_init_IRQ();
300 
301         printk(arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
302 
303         arc_mmu_init();
304         arc_cache_init();
305         arc_chk_ccms();
306 
307         printk(arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
308 
309 #ifdef CONFIG_SMP
310         printk(arc_platform_smp_cpuinfo());
311 #endif
312 
313         arc_chk_fpu();
314 }
315 
316 void __init setup_arch(char **cmdline_p)
317 {
318         /* This also populates @boot_command_line from /bootargs */
319         machine_desc = setup_machine_fdt(__dtb_start);
320         if (!machine_desc)
321                 panic("Embedded DT invalid\n");
322 
323         /* Append any u-boot provided cmdline */
324 #ifdef CONFIG_CMDLINE_UBOOT
325         /* Add a whitespace seperator between the 2 cmdlines */
326         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
327         strlcat(boot_command_line, command_line, COMMAND_LINE_SIZE);
328 #endif
329 
330         /* Save unparsed command line copy for /proc/cmdline */
331         *cmdline_p = boot_command_line;
332 
333         /* To force early parsing of things like mem=xxx */
334         parse_early_param();
335 
336         /* Platform/board specific: e.g. early console registration */
337         if (machine_desc->init_early)
338                 machine_desc->init_early();
339 
340         setup_processor();
341 
342 #ifdef CONFIG_SMP
343         smp_init_cpus();
344 #endif
345 
346         setup_arch_memory();
347 
348         /* copy flat DT out of .init and then unflatten it */
349         copy_devtree();
350         unflatten_device_tree();
351 
352         /* Can be issue if someone passes cmd line arg "ro"
353          * But that is unlikely so keeping it as it is
354          */
355         root_mountflags &= ~MS_RDONLY;
356 
357         console_verbose();
358 
359 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
360         conswitchp = &dummy_con;
361 #endif
362 
363         arc_unwind_init();
364         arc_unwind_setup();
365 }
366 
367 static int __init customize_machine(void)
368 {
369         /* Add platform devices */
370         if (machine_desc->init_machine)
371                 machine_desc->init_machine();
372 
373         return 0;
374 }
375 arch_initcall(customize_machine);
376 
377 static int __init init_late_machine(void)
378 {
379         if (machine_desc->init_late)
380                 machine_desc->init_late();
381 
382         return 0;
383 }
384 late_initcall(init_late_machine);
385 /*
386  *  Get CPU information for use by the procfs.
387  */
388 
389 #define cpu_to_ptr(c)   ((void *)(0xFFFF0000 | (unsigned int)(c)))
390 #define ptr_to_cpu(p)   (~0xFFFF0000UL & (unsigned int)(p))
391 
392 static int show_cpuinfo(struct seq_file *m, void *v)
393 {
394         char *str;
395         int cpu_id = ptr_to_cpu(v);
396 
397         str = (char *)__get_free_page(GFP_TEMPORARY);
398         if (!str)
399                 goto done;
400 
401         seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
402 
403         seq_printf(m, "Bogo MIPS : \t%lu.%02lu\n",
404                    loops_per_jiffy / (500000 / HZ),
405                    (loops_per_jiffy / (5000 / HZ)) % 100);
406 
407         seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
408 
409         seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
410 
411         seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
412 
413 #ifdef CONFIG_SMP
414         seq_printf(m, arc_platform_smp_cpuinfo());
415 #endif
416 
417         free_page((unsigned long)str);
418 done:
419         seq_printf(m, "\n\n");
420 
421         return 0;
422 }
423 
424 static void *c_start(struct seq_file *m, loff_t *pos)
425 {
426         /*
427          * Callback returns cpu-id to iterator for show routine, NULL to stop.
428          * However since NULL is also a valid cpu-id (0), we use a round-about
429          * way to pass it w/o having to kmalloc/free a 2 byte string.
430          * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
431          */
432         return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
433 }
434 
435 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
436 {
437         ++*pos;
438         return c_start(m, pos);
439 }
440 
441 static void c_stop(struct seq_file *m, void *v)
442 {
443 }
444 
445 const struct seq_operations cpuinfo_op = {
446         .start  = c_start,
447         .next   = c_next,
448         .stop   = c_stop,
449         .show   = show_cpuinfo
450 };
451 
452 static DEFINE_PER_CPU(struct cpu, cpu_topology);
453 
454 static int __init topology_init(void)
455 {
456         int cpu;
457 
458         for_each_present_cpu(cpu)
459             register_cpu(&per_cpu(cpu_topology, cpu), cpu);
460 
461         return 0;
462 }
463 
464 subsys_initcall(topology_init);
465 

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