2 * arch/xtensa/kernel/setup.c
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
8 * Copyright (C) 1995 Linus Torvalds
9 * Copyright (C) 2001 - 2005 Tensilica Inc.
11 * Chris Zankel <chris@zankel.net>
12 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
14 * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
17 #include <linux/errno.h>
18 #include <linux/init.h>
20 #include <linux/proc_fs.h>
21 #include <linux/screen_info.h>
22 #include <linux/bootmem.h>
23 #include <linux/kernel.h>
24 #include <linux/percpu.h>
25 #include <linux/clk-provider.h>
26 #include <linux/cpu.h>
27 #include <linux/of_fdt.h>
28 #include <linux/of_platform.h>
30 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
31 # include <linux/console.h>
35 # include <linux/timex.h>
39 # include <linux/seq_file.h>
42 #include <asm/bootparam.h>
43 #include <asm/mmu_context.h>
44 #include <asm/pgtable.h>
45 #include <asm/processor.h>
46 #include <asm/timex.h>
47 #include <asm/platform.h>
49 #include <asm/setup.h>
50 #include <asm/param.h>
51 #include <asm/traps.h>
54 #include <platform/hardware.h>
56 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
57 struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
60 #ifdef CONFIG_BLK_DEV_FD
61 extern struct fd_ops no_fd_ops;
62 struct fd_ops *fd_ops;
65 extern struct rtc_ops no_rtc_ops;
66 struct rtc_ops *rtc_ops;
68 #ifdef CONFIG_BLK_DEV_INITRD
69 extern unsigned long initrd_start;
70 extern unsigned long initrd_end;
71 int initrd_is_mapped = 0;
72 extern int initrd_below_start_ok;
76 extern u32 __dtb_start[];
77 void *dtb_start = __dtb_start;
80 unsigned char aux_device_present;
81 extern unsigned long loops_per_jiffy;
83 /* Command line specified as configuration option. */
85 static char __initdata command_line[COMMAND_LINE_SIZE];
87 #ifdef CONFIG_CMDLINE_BOOL
88 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
91 sysmem_info_t __initdata sysmem;
93 extern int mem_reserve(unsigned long, unsigned long, int);
94 extern void bootmem_init(void);
95 extern void zones_init(void);
98 * Boot parameter parsing.
100 * The Xtensa port uses a list of variable-sized tags to pass data to
101 * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
102 * to be recognised. The list is terminated with a zero-sized
106 typedef struct tagtable {
108 int (*parse)(const bp_tag_t*);
111 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn \
112 __attribute__((used, section(".taglist"))) = { tag, fn }
114 /* parse current tag */
116 static int __init add_sysmem_bank(unsigned long type, unsigned long start,
119 if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) {
121 "Ignoring memory bank 0x%08lx size %ldKB\n",
125 sysmem.bank[sysmem.nr_banks].type = type;
126 sysmem.bank[sysmem.nr_banks].start = PAGE_ALIGN(start);
127 sysmem.bank[sysmem.nr_banks].end = end & PAGE_MASK;
133 static int __init parse_tag_mem(const bp_tag_t *tag)
135 meminfo_t *mi = (meminfo_t *)(tag->data);
137 if (mi->type != MEMORY_TYPE_CONVENTIONAL)
140 return add_sysmem_bank(mi->type, mi->start, mi->end);
143 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
145 #ifdef CONFIG_BLK_DEV_INITRD
147 static int __init parse_tag_initrd(const bp_tag_t* tag)
150 mi = (meminfo_t*)(tag->data);
151 initrd_start = (unsigned long)__va(mi->start);
152 initrd_end = (unsigned long)__va(mi->end);
157 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
161 static int __init parse_tag_fdt(const bp_tag_t *tag)
163 dtb_start = __va(tag->data[0]);
167 __tagtable(BP_TAG_FDT, parse_tag_fdt);
169 #endif /* CONFIG_OF */
171 #endif /* CONFIG_BLK_DEV_INITRD */
173 static int __init parse_tag_cmdline(const bp_tag_t* tag)
175 strlcpy(command_line, (char *)(tag->data), COMMAND_LINE_SIZE);
179 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
181 static int __init parse_bootparam(const bp_tag_t* tag)
183 extern tagtable_t __tagtable_begin, __tagtable_end;
186 /* Boot parameters must start with a BP_TAG_FIRST tag. */
188 if (tag->id != BP_TAG_FIRST) {
189 printk(KERN_WARNING "Invalid boot parameters!\n");
193 tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
195 /* Parse all tags. */
197 while (tag != NULL && tag->id != BP_TAG_LAST) {
198 for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
199 if (tag->id == t->tag) {
204 if (t == &__tagtable_end)
205 printk(KERN_WARNING "Ignoring tag "
206 "0x%08x\n", tag->id);
207 tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
214 bool __initdata dt_memory_scan = false;
216 #if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
217 unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR;
218 EXPORT_SYMBOL(xtensa_kio_paddr);
220 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
221 int depth, void *data)
223 const __be32 *ranges;
229 if (!of_flat_dt_is_compatible(node, "simple-bus"))
232 ranges = of_get_flat_dt_prop(node, "ranges", &len);
238 xtensa_kio_paddr = of_read_ulong(ranges+1, 1);
239 /* round down to nearest 256MB boundary */
240 xtensa_kio_paddr &= 0xf0000000;
245 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
246 int depth, void *data)
252 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
258 add_sysmem_bank(MEMORY_TYPE_CONVENTIONAL, base, base + size);
261 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
263 return __alloc_bootmem(size, align, 0);
266 void __init early_init_devtree(void *params)
268 if (sysmem.nr_banks == 0)
269 dt_memory_scan = true;
271 early_init_dt_scan(params);
272 of_scan_flat_dt(xtensa_dt_io_area, NULL);
274 if (!command_line[0])
275 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
278 static int __init xtensa_device_probe(void)
281 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
285 device_initcall(xtensa_device_probe);
287 #endif /* CONFIG_OF */
290 * Initialize architecture. (Early stage)
293 void __init init_arch(bp_tag_t *bp_start)
297 /* Parse boot parameters */
300 parse_bootparam(bp_start);
303 early_init_devtree(dtb_start);
306 if (sysmem.nr_banks == 0) {
308 sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
309 sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
310 + PLATFORM_DEFAULT_MEM_SIZE;
313 #ifdef CONFIG_CMDLINE_BOOL
314 if (!command_line[0])
315 strlcpy(command_line, default_command_line, COMMAND_LINE_SIZE);
318 /* Early hook for platforms */
320 platform_init(bp_start);
322 /* Initialize MMU. */
328 * Initialize system. Setup memory and reserve regions.
333 extern char _WindowVectors_text_start;
334 extern char _WindowVectors_text_end;
335 extern char _DebugInterruptVector_literal_start;
336 extern char _DebugInterruptVector_text_end;
337 extern char _KernelExceptionVector_literal_start;
338 extern char _KernelExceptionVector_text_end;
339 extern char _UserExceptionVector_literal_start;
340 extern char _UserExceptionVector_text_end;
341 extern char _DoubleExceptionVector_literal_start;
342 extern char _DoubleExceptionVector_text_end;
343 #if XCHAL_EXCM_LEVEL >= 2
344 extern char _Level2InterruptVector_text_start;
345 extern char _Level2InterruptVector_text_end;
347 #if XCHAL_EXCM_LEVEL >= 3
348 extern char _Level3InterruptVector_text_start;
349 extern char _Level3InterruptVector_text_end;
351 #if XCHAL_EXCM_LEVEL >= 4
352 extern char _Level4InterruptVector_text_start;
353 extern char _Level4InterruptVector_text_end;
355 #if XCHAL_EXCM_LEVEL >= 5
356 extern char _Level5InterruptVector_text_start;
357 extern char _Level5InterruptVector_text_end;
359 #if XCHAL_EXCM_LEVEL >= 6
360 extern char _Level6InterruptVector_text_start;
361 extern char _Level6InterruptVector_text_end;
366 #ifdef CONFIG_S32C1I_SELFTEST
367 #if XCHAL_HAVE_S32C1I
369 static int __initdata rcw_word, rcw_probe_pc, rcw_exc;
372 * Basic atomic compare-and-swap, that records PC of S32C1I for probing.
374 * If *v == cmp, set *v = set. Return previous *v.
376 static inline int probed_compare_swap(int *v, int cmp, int set)
380 __asm__ __volatile__(
383 " wsr %2, scompare1\n"
384 "1: s32c1i %0, %3, 0\n"
385 : "=a" (set), "=&a" (tmp)
386 : "a" (cmp), "a" (v), "a" (&rcw_probe_pc), "0" (set)
392 /* Handle probed exception */
394 static void __init do_probed_exception(struct pt_regs *regs,
395 unsigned long exccause)
397 if (regs->pc == rcw_probe_pc) { /* exception on s32c1i ? */
398 regs->pc += 3; /* skip the s32c1i instruction */
401 do_unhandled(regs, exccause);
405 /* Simple test of S32C1I (soc bringup assist) */
407 static int __init check_s32c1i(void)
409 int n, cause1, cause2;
410 void *handbus, *handdata, *handaddr; /* temporarily saved handlers */
413 handbus = trap_set_handler(EXCCAUSE_LOAD_STORE_ERROR,
414 do_probed_exception);
415 handdata = trap_set_handler(EXCCAUSE_LOAD_STORE_DATA_ERROR,
416 do_probed_exception);
417 handaddr = trap_set_handler(EXCCAUSE_LOAD_STORE_ADDR_ERROR,
418 do_probed_exception);
420 /* First try an S32C1I that does not store: */
423 n = probed_compare_swap(&rcw_word, 0, 2);
426 /* took exception? */
428 /* unclean exception? */
429 if (n != 2 || rcw_word != 1)
430 panic("S32C1I exception error");
431 } else if (rcw_word != 1 || n != 1) {
432 panic("S32C1I compare error");
435 /* Then an S32C1I that stores: */
437 rcw_word = 0x1234567;
438 n = probed_compare_swap(&rcw_word, 0x1234567, 0xabcde);
442 /* unclean exception? */
443 if (n != 0xabcde || rcw_word != 0x1234567)
444 panic("S32C1I exception error (b)");
445 } else if (rcw_word != 0xabcde || n != 0x1234567) {
446 panic("S32C1I store error");
449 /* Verify consistency of exceptions: */
450 if (cause1 || cause2) {
451 pr_warn("S32C1I took exception %d, %d\n", cause1, cause2);
452 /* If emulation of S32C1I upon bus error gets implemented,
453 we can get rid of this panic for single core (not SMP) */
454 panic("S32C1I exceptions not currently supported");
456 if (cause1 != cause2)
457 panic("inconsistent S32C1I exceptions");
459 trap_set_handler(EXCCAUSE_LOAD_STORE_ERROR, handbus);
460 trap_set_handler(EXCCAUSE_LOAD_STORE_DATA_ERROR, handdata);
461 trap_set_handler(EXCCAUSE_LOAD_STORE_ADDR_ERROR, handaddr);
465 #else /* XCHAL_HAVE_S32C1I */
467 /* This condition should not occur with a commercially deployed processor.
468 Display reminder for early engr test or demo chips / FPGA bitstreams */
469 static int __init check_s32c1i(void)
471 pr_warn("Processor configuration lacks atomic compare-and-swap support!\n");
475 #endif /* XCHAL_HAVE_S32C1I */
476 early_initcall(check_s32c1i);
477 #endif /* CONFIG_S32C1I_SELFTEST */
480 void __init setup_arch(char **cmdline_p)
482 strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
483 *cmdline_p = command_line;
485 /* Reserve some memory regions */
487 #ifdef CONFIG_BLK_DEV_INITRD
488 if (initrd_start < initrd_end) {
489 initrd_is_mapped = mem_reserve(__pa(initrd_start),
490 __pa(initrd_end), 0);
491 initrd_below_start_ok = 1;
497 mem_reserve(__pa(&_stext),__pa(&_end), 1);
499 mem_reserve(__pa(&_WindowVectors_text_start),
500 __pa(&_WindowVectors_text_end), 0);
502 mem_reserve(__pa(&_DebugInterruptVector_literal_start),
503 __pa(&_DebugInterruptVector_text_end), 0);
505 mem_reserve(__pa(&_KernelExceptionVector_literal_start),
506 __pa(&_KernelExceptionVector_text_end), 0);
508 mem_reserve(__pa(&_UserExceptionVector_literal_start),
509 __pa(&_UserExceptionVector_text_end), 0);
511 mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
512 __pa(&_DoubleExceptionVector_text_end), 0);
514 #if XCHAL_EXCM_LEVEL >= 2
515 mem_reserve(__pa(&_Level2InterruptVector_text_start),
516 __pa(&_Level2InterruptVector_text_end), 0);
518 #if XCHAL_EXCM_LEVEL >= 3
519 mem_reserve(__pa(&_Level3InterruptVector_text_start),
520 __pa(&_Level3InterruptVector_text_end), 0);
522 #if XCHAL_EXCM_LEVEL >= 4
523 mem_reserve(__pa(&_Level4InterruptVector_text_start),
524 __pa(&_Level4InterruptVector_text_end), 0);
526 #if XCHAL_EXCM_LEVEL >= 5
527 mem_reserve(__pa(&_Level5InterruptVector_text_start),
528 __pa(&_Level5InterruptVector_text_end), 0);
530 #if XCHAL_EXCM_LEVEL >= 6
531 mem_reserve(__pa(&_Level6InterruptVector_text_start),
532 __pa(&_Level6InterruptVector_text_end), 0);
537 unflatten_and_copy_device_tree();
539 platform_setup(cmdline_p);
549 # if defined(CONFIG_VGA_CONSOLE)
550 conswitchp = &vga_con;
551 # elif defined(CONFIG_DUMMY_CONSOLE)
552 conswitchp = &dummy_con;
557 platform_pcibios_init();
561 static DEFINE_PER_CPU(struct cpu, cpu_data);
563 static int __init topology_init(void)
567 for_each_possible_cpu(i) {
568 struct cpu *cpu = &per_cpu(cpu_data, i);
569 cpu->hotpluggable = !!i;
570 register_cpu(cpu, i);
575 subsys_initcall(topology_init);
577 void machine_restart(char * cmd)
582 void machine_halt(void)
588 void machine_power_off(void)
590 platform_power_off();
593 #ifdef CONFIG_PROC_FS
596 * Display some core information through /proc/cpuinfo.
600 c_show(struct seq_file *f, void *slot)
602 char buf[NR_CPUS * 5];
604 cpulist_scnprintf(buf, sizeof(buf), cpu_online_mask);
605 /* high-level stuff */
606 seq_printf(f, "CPU count\t: %u\n"
608 "vendor_id\t: Tensilica\n"
609 "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
610 "core ID\t\t: " XCHAL_CORE_ID "\n"
613 "cpu MHz\t\t: %lu.%02lu\n"
614 "bogomips\t: %lu.%02lu\n",
617 XCHAL_BUILD_UNIQUE_ID,
618 XCHAL_HAVE_BE ? "big" : "little",
620 (ccount_freq/10000) % 100,
621 loops_per_jiffy/(500000/HZ),
622 (loops_per_jiffy/(5000/HZ)) % 100);
624 seq_printf(f,"flags\t\t: "
634 #if XCHAL_HAVE_DENSITY
637 #if XCHAL_HAVE_BOOLEANS
646 #if XCHAL_HAVE_MINMAX
652 #if XCHAL_HAVE_CLAMPS
664 #if XCHAL_HAVE_MUL32_HIGH
670 #if XCHAL_HAVE_S32C1I
676 seq_printf(f,"physical aregs\t: %d\n"
687 seq_printf(f,"num ints\t: %d\n"
691 "debug level\t: %d\n",
692 XCHAL_NUM_INTERRUPTS,
693 XCHAL_NUM_EXTINTERRUPTS,
699 seq_printf(f,"icache line size: %d\n"
700 "icache ways\t: %d\n"
701 "icache size\t: %d\n"
703 #if XCHAL_ICACHE_LINE_LOCKABLE
707 "dcache line size: %d\n"
708 "dcache ways\t: %d\n"
709 "dcache size\t: %d\n"
711 #if XCHAL_DCACHE_IS_WRITEBACK
714 #if XCHAL_DCACHE_LINE_LOCKABLE
718 XCHAL_ICACHE_LINESIZE,
721 XCHAL_DCACHE_LINESIZE,
729 * We show only CPU #0 info.
732 c_start(struct seq_file *f, loff_t *pos)
734 return (*pos == 0) ? (void *)1 : NULL;
738 c_next(struct seq_file *f, void *v, loff_t *pos)
744 c_stop(struct seq_file *f, void *v)
748 const struct seq_operations cpuinfo_op =
756 #endif /* CONFIG_PROC_FS */