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TOMOYO Linux Cross Reference
Linux/arch/c6x/kernel/setup.c

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  1 /*
  2  *  Port on Texas Instruments TMS320C6x architecture
  3  *
  4  *  Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
  5  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
  6  *
  7  *  This program is free software; you can redistribute it and/or modify
  8  *  it under the terms of the GNU General Public License version 2 as
  9  *  published by the Free Software Foundation.
 10  */
 11 #include <linux/dma-mapping.h>
 12 #include <linux/memblock.h>
 13 #include <linux/seq_file.h>
 14 #include <linux/bootmem.h>
 15 #include <linux/clkdev.h>
 16 #include <linux/initrd.h>
 17 #include <linux/kernel.h>
 18 #include <linux/module.h>
 19 #include <linux/of_fdt.h>
 20 #include <linux/string.h>
 21 #include <linux/errno.h>
 22 #include <linux/cache.h>
 23 #include <linux/delay.h>
 24 #include <linux/sched.h>
 25 #include <linux/clk.h>
 26 #include <linux/cpu.h>
 27 #include <linux/fs.h>
 28 #include <linux/of.h>
 29 #include <linux/console.h>
 30 #include <linux/screen_info.h>
 31 
 32 #include <asm/sections.h>
 33 #include <asm/div64.h>
 34 #include <asm/setup.h>
 35 #include <asm/dscr.h>
 36 #include <asm/clock.h>
 37 #include <asm/soc.h>
 38 #include <asm/special_insns.h>
 39 
 40 static const char *c6x_soc_name;
 41 
 42 struct screen_info screen_info;
 43 
 44 int c6x_num_cores;
 45 EXPORT_SYMBOL_GPL(c6x_num_cores);
 46 
 47 unsigned int c6x_silicon_rev;
 48 EXPORT_SYMBOL_GPL(c6x_silicon_rev);
 49 
 50 /*
 51  * Device status register. This holds information
 52  * about device configuration needed by some drivers.
 53  */
 54 unsigned int c6x_devstat;
 55 EXPORT_SYMBOL_GPL(c6x_devstat);
 56 
 57 /*
 58  * Some SoCs have fuse registers holding a unique MAC
 59  * address. This is parsed out of the device tree with
 60  * the resulting MAC being held here.
 61  */
 62 unsigned char c6x_fuse_mac[6];
 63 
 64 unsigned long memory_start;
 65 unsigned long memory_end;
 66 EXPORT_SYMBOL(memory_end);
 67 
 68 unsigned long ram_start;
 69 unsigned long ram_end;
 70 
 71 /* Uncached memory for DMA consistent use (memdma=) */
 72 static unsigned long dma_start __initdata;
 73 static unsigned long dma_size __initdata;
 74 
 75 struct cpuinfo_c6x {
 76         const char *cpu_name;
 77         const char *cpu_voltage;
 78         const char *mmu;
 79         const char *fpu;
 80         char *cpu_rev;
 81         unsigned int core_id;
 82         char __cpu_rev[5];
 83 };
 84 
 85 static DEFINE_PER_CPU(struct cpuinfo_c6x, cpu_data);
 86 
 87 unsigned int ticks_per_ns_scaled;
 88 EXPORT_SYMBOL(ticks_per_ns_scaled);
 89 
 90 unsigned int c6x_core_freq;
 91 
 92 static void __init get_cpuinfo(void)
 93 {
 94         unsigned cpu_id, rev_id, csr;
 95         struct clk *coreclk = clk_get_sys(NULL, "core");
 96         unsigned long core_khz;
 97         u64 tmp;
 98         struct cpuinfo_c6x *p;
 99         struct device_node *node, *np;
100 
101         p = &per_cpu(cpu_data, smp_processor_id());
102 
103         if (!IS_ERR(coreclk))
104                 c6x_core_freq = clk_get_rate(coreclk);
105         else {
106                 printk(KERN_WARNING
107                        "Cannot find core clock frequency. Using 700MHz\n");
108                 c6x_core_freq = 700000000;
109         }
110 
111         core_khz = c6x_core_freq / 1000;
112 
113         tmp = (uint64_t)core_khz << C6X_NDELAY_SCALE;
114         do_div(tmp, 1000000);
115         ticks_per_ns_scaled = tmp;
116 
117         csr = get_creg(CSR);
118         cpu_id = csr >> 24;
119         rev_id = (csr >> 16) & 0xff;
120 
121         p->mmu = "none";
122         p->fpu = "none";
123         p->cpu_voltage = "unknown";
124 
125         switch (cpu_id) {
126         case 0:
127                 p->cpu_name = "C67x";
128                 p->fpu = "yes";
129                 break;
130         case 2:
131                 p->cpu_name = "C62x";
132                 break;
133         case 8:
134                 p->cpu_name = "C64x";
135                 break;
136         case 12:
137                 p->cpu_name = "C64x";
138                 break;
139         case 16:
140                 p->cpu_name = "C64x+";
141                 p->cpu_voltage = "1.2";
142                 break;
143         case 21:
144                 p->cpu_name = "C66X";
145                 p->cpu_voltage = "1.2";
146                 break;
147         default:
148                 p->cpu_name = "unknown";
149                 break;
150         }
151 
152         if (cpu_id < 16) {
153                 switch (rev_id) {
154                 case 0x1:
155                         if (cpu_id > 8) {
156                                 p->cpu_rev = "DM640/DM641/DM642/DM643";
157                                 p->cpu_voltage = "1.2 - 1.4";
158                         } else {
159                                 p->cpu_rev = "C6201";
160                                 p->cpu_voltage = "2.5";
161                         }
162                         break;
163                 case 0x2:
164                         p->cpu_rev = "C6201B/C6202/C6211";
165                         p->cpu_voltage = "1.8";
166                         break;
167                 case 0x3:
168                         p->cpu_rev = "C6202B/C6203/C6204/C6205";
169                         p->cpu_voltage = "1.5";
170                         break;
171                 case 0x201:
172                         p->cpu_rev = "C6701 revision 0 (early CPU)";
173                         p->cpu_voltage = "1.8";
174                         break;
175                 case 0x202:
176                         p->cpu_rev = "C6701/C6711/C6712";
177                         p->cpu_voltage = "1.8";
178                         break;
179                 case 0x801:
180                         p->cpu_rev = "C64x";
181                         p->cpu_voltage = "1.5";
182                         break;
183                 default:
184                         p->cpu_rev = "unknown";
185                 }
186         } else {
187                 p->cpu_rev = p->__cpu_rev;
188                 snprintf(p->__cpu_rev, sizeof(p->__cpu_rev), "0x%x", cpu_id);
189         }
190 
191         p->core_id = get_coreid();
192 
193         node = of_find_node_by_name(NULL, "cpus");
194         if (node) {
195                 for_each_child_of_node(node, np)
196                         if (!strcmp("cpu", np->name))
197                                 ++c6x_num_cores;
198                 of_node_put(node);
199         }
200 
201         node = of_find_node_by_name(NULL, "soc");
202         if (node) {
203                 if (of_property_read_string(node, "model", &c6x_soc_name))
204                         c6x_soc_name = "unknown";
205                 of_node_put(node);
206         } else
207                 c6x_soc_name = "unknown";
208 
209         printk(KERN_INFO "CPU%d: %s rev %s, %s volts, %uMHz\n",
210                p->core_id, p->cpu_name, p->cpu_rev,
211                p->cpu_voltage, c6x_core_freq / 1000000);
212 }
213 
214 /*
215  * Early parsing of the command line
216  */
217 static u32 mem_size __initdata;
218 
219 /* "mem=" parsing. */
220 static int __init early_mem(char *p)
221 {
222         if (!p)
223                 return -EINVAL;
224 
225         mem_size = memparse(p, &p);
226         /* don't remove all of memory when handling "mem={invalid}" */
227         if (mem_size == 0)
228                 return -EINVAL;
229 
230         return 0;
231 }
232 early_param("mem", early_mem);
233 
234 /* "memdma=<size>[@<address>]" parsing. */
235 static int __init early_memdma(char *p)
236 {
237         if (!p)
238                 return -EINVAL;
239 
240         dma_size = memparse(p, &p);
241         if (*p == '@')
242                 dma_start = memparse(p, &p);
243 
244         return 0;
245 }
246 early_param("memdma", early_memdma);
247 
248 int __init c6x_add_memory(phys_addr_t start, unsigned long size)
249 {
250         static int ram_found __initdata;
251 
252         /* We only handle one bank (the one with PAGE_OFFSET) for now */
253         if (ram_found)
254                 return -EINVAL;
255 
256         if (start > PAGE_OFFSET || PAGE_OFFSET >= (start + size))
257                 return 0;
258 
259         ram_start = start;
260         ram_end = start + size;
261 
262         ram_found = 1;
263         return 0;
264 }
265 
266 /*
267  * Do early machine setup and device tree parsing. This is called very
268  * early on the boot process.
269  */
270 notrace void __init machine_init(unsigned long dt_ptr)
271 {
272         void *dtb = __va(dt_ptr);
273         void *fdt = _fdt_start;
274 
275         /* interrupts must be masked */
276         set_creg(IER, 2);
277 
278         /*
279          * Set the Interrupt Service Table (IST) to the beginning of the
280          * vector table.
281          */
282         set_ist(_vectors_start);
283 
284         /*
285          * dtb is passed in from bootloader.
286          * fdt is linked in blob.
287          */
288         if (dtb && dtb != fdt)
289                 fdt = dtb;
290 
291         /* Do some early initialization based on the flat device tree */
292         early_init_dt_scan(fdt);
293 
294         parse_early_param();
295 }
296 
297 void __init setup_arch(char **cmdline_p)
298 {
299         int bootmap_size;
300         struct memblock_region *reg;
301 
302         printk(KERN_INFO "Initializing kernel\n");
303 
304         /* Initialize command line */
305         *cmdline_p = boot_command_line;
306 
307         memory_end = ram_end;
308         memory_end &= ~(PAGE_SIZE - 1);
309 
310         if (mem_size && (PAGE_OFFSET + PAGE_ALIGN(mem_size)) < memory_end)
311                 memory_end = PAGE_OFFSET + PAGE_ALIGN(mem_size);
312 
313         /* add block that this kernel can use */
314         memblock_add(PAGE_OFFSET, memory_end - PAGE_OFFSET);
315 
316         /* reserve kernel text/data/bss */
317         memblock_reserve(PAGE_OFFSET,
318                          PAGE_ALIGN((unsigned long)&_end - PAGE_OFFSET));
319 
320         if (dma_size) {
321                 /* align to cacheability granularity */
322                 dma_size = CACHE_REGION_END(dma_size);
323 
324                 if (!dma_start)
325                         dma_start = memory_end - dma_size;
326 
327                 /* align to cacheability granularity */
328                 dma_start = CACHE_REGION_START(dma_start);
329 
330                 /* reserve DMA memory taken from kernel memory */
331                 if (memblock_is_region_memory(dma_start, dma_size))
332                         memblock_reserve(dma_start, dma_size);
333         }
334 
335         memory_start = PAGE_ALIGN((unsigned int) &_end);
336 
337         printk(KERN_INFO "Memory Start=%08lx, Memory End=%08lx\n",
338                memory_start, memory_end);
339 
340 #ifdef CONFIG_BLK_DEV_INITRD
341         /*
342          * Reserve initrd memory if in kernel memory.
343          */
344         if (initrd_start < initrd_end)
345                 if (memblock_is_region_memory(initrd_start,
346                                               initrd_end - initrd_start))
347                         memblock_reserve(initrd_start,
348                                          initrd_end - initrd_start);
349 #endif
350 
351         init_mm.start_code = (unsigned long) &_stext;
352         init_mm.end_code   = (unsigned long) &_etext;
353         init_mm.end_data   = memory_start;
354         init_mm.brk        = memory_start;
355 
356         /*
357          * Give all the memory to the bootmap allocator,  tell it to put the
358          * boot mem_map at the start of memory
359          */
360         bootmap_size = init_bootmem_node(NODE_DATA(0),
361                                          memory_start >> PAGE_SHIFT,
362                                          PAGE_OFFSET >> PAGE_SHIFT,
363                                          memory_end >> PAGE_SHIFT);
364         memblock_reserve(memory_start, bootmap_size);
365 
366         unflatten_device_tree();
367 
368         c6x_cache_init();
369 
370         /* Set the whole external memory as non-cacheable */
371         disable_caching(ram_start, ram_end - 1);
372 
373         /* Set caching of external RAM used by Linux */
374         for_each_memblock(memory, reg)
375                 enable_caching(CACHE_REGION_START(reg->base),
376                                CACHE_REGION_START(reg->base + reg->size - 1));
377 
378 #ifdef CONFIG_BLK_DEV_INITRD
379         /*
380          * Enable caching for initrd which falls outside kernel memory.
381          */
382         if (initrd_start < initrd_end) {
383                 if (!memblock_is_region_memory(initrd_start,
384                                                initrd_end - initrd_start))
385                         enable_caching(CACHE_REGION_START(initrd_start),
386                                        CACHE_REGION_START(initrd_end - 1));
387         }
388 #endif
389 
390         /*
391          * Disable caching for dma coherent memory taken from kernel memory.
392          */
393         if (dma_size && memblock_is_region_memory(dma_start, dma_size))
394                 disable_caching(dma_start,
395                                 CACHE_REGION_START(dma_start + dma_size - 1));
396 
397         /* Initialize the coherent memory allocator */
398         coherent_mem_init(dma_start, dma_size);
399 
400         /*
401          * Free all memory as a starting point.
402          */
403         free_bootmem(PAGE_OFFSET, memory_end - PAGE_OFFSET);
404 
405         /*
406          * Then reserve memory which is already being used.
407          */
408         for_each_memblock(reserved, reg) {
409                 pr_debug("reserved - 0x%08x-0x%08x\n",
410                          (u32) reg->base, (u32) reg->size);
411                 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
412         }
413 
414         max_low_pfn = PFN_DOWN(memory_end);
415         min_low_pfn = PFN_UP(memory_start);
416         max_mapnr = max_low_pfn - min_low_pfn;
417 
418         /* Get kmalloc into gear */
419         paging_init();
420 
421         /*
422          * Probe for Device State Configuration Registers.
423          * We have to do this early in case timer needs to be enabled
424          * through DSCR.
425          */
426         dscr_probe();
427 
428         /* We do this early for timer and core clock frequency */
429         c64x_setup_clocks();
430 
431         /* Get CPU info */
432         get_cpuinfo();
433 
434 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
435         conswitchp = &dummy_con;
436 #endif
437 }
438 
439 #define cpu_to_ptr(n) ((void *)((long)(n)+1))
440 #define ptr_to_cpu(p) ((long)(p) - 1)
441 
442 static int show_cpuinfo(struct seq_file *m, void *v)
443 {
444         int n = ptr_to_cpu(v);
445         struct cpuinfo_c6x *p = &per_cpu(cpu_data, n);
446 
447         if (n == 0) {
448                 seq_printf(m,
449                            "soc\t\t: %s\n"
450                            "soc revision\t: 0x%x\n"
451                            "soc cores\t: %d\n",
452                            c6x_soc_name, c6x_silicon_rev, c6x_num_cores);
453         }
454 
455         seq_printf(m,
456                    "\n"
457                    "processor\t: %d\n"
458                    "cpu\t\t: %s\n"
459                    "core revision\t: %s\n"
460                    "core voltage\t: %s\n"
461                    "core id\t\t: %d\n"
462                    "mmu\t\t: %s\n"
463                    "fpu\t\t: %s\n"
464                    "cpu MHz\t\t: %u\n"
465                    "bogomips\t: %lu.%02lu\n\n",
466                    n,
467                    p->cpu_name, p->cpu_rev, p->cpu_voltage,
468                    p->core_id, p->mmu, p->fpu,
469                    (c6x_core_freq + 500000) / 1000000,
470                    (loops_per_jiffy/(500000/HZ)),
471                    (loops_per_jiffy/(5000/HZ))%100);
472 
473         return 0;
474 }
475 
476 static void *c_start(struct seq_file *m, loff_t *pos)
477 {
478         return *pos < nr_cpu_ids ? cpu_to_ptr(*pos) : NULL;
479 }
480 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
481 {
482         ++*pos;
483         return NULL;
484 }
485 static void c_stop(struct seq_file *m, void *v)
486 {
487 }
488 
489 const struct seq_operations cpuinfo_op = {
490         c_start,
491         c_stop,
492         c_next,
493         show_cpuinfo
494 };
495 
496 static struct cpu cpu_devices[NR_CPUS];
497 
498 static int __init topology_init(void)
499 {
500         int i;
501 
502         for_each_present_cpu(i)
503                 register_cpu(&cpu_devices[i], i);
504 
505         return 0;
506 }
507 
508 subsys_initcall(topology_init);
509 

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