2 * arch/sh/kernel/setup.c
4 * This file handles the architecture-dependent parts of initialization
6 * Copyright (C) 1999 Niibe Yutaka
7 * Copyright (C) 2002 - 2007 Paul Mundt
9 #include <linux/screen_info.h>
10 #include <linux/ioport.h>
11 #include <linux/init.h>
12 #include <linux/initrd.h>
13 #include <linux/bootmem.h>
14 #include <linux/console.h>
15 #include <linux/seq_file.h>
16 #include <linux/root_dev.h>
17 #include <linux/utsname.h>
18 #include <linux/nodemask.h>
19 #include <linux/cpu.h>
20 #include <linux/pfn.h>
23 #include <linux/kexec.h>
24 #include <linux/module.h>
25 #include <linux/smp.h>
26 #include <linux/err.h>
27 #include <linux/debugfs.h>
28 #include <linux/crash_dump.h>
29 #include <linux/mmzone.h>
30 #include <linux/clk.h>
31 #include <linux/delay.h>
32 #include <linux/platform_device.h>
33 #include <linux/lmb.h>
34 #include <asm/uaccess.h>
38 #include <asm/sections.h>
40 #include <asm/setup.h>
41 #include <asm/clock.h>
42 #include <asm/mmu_context.h>
45 * Initialize loops_per_jiffy as 10000000 (1000MIPS).
46 * This value will be used at the very early stage of serial setup.
47 * The bigger value means no problem.
49 struct sh_cpuinfo cpu_data
[NR_CPUS
] __read_mostly
= {
52 .loops_per_jiffy
= 10000000,
55 EXPORT_SYMBOL(cpu_data
);
58 * The machine vector. First entry in .machvec.init, or clobbered by
59 * sh_mv= on the command line, prior to .machvec.init teardown.
61 struct sh_machine_vector sh_mv
= { .mv_name
= "generic", };
65 struct screen_info screen_info
;
68 extern int root_mountflags
;
70 #define RAMDISK_IMAGE_START_MASK 0x07FF
71 #define RAMDISK_PROMPT_FLAG 0x8000
72 #define RAMDISK_LOAD_FLAG 0x4000
74 static char __initdata command_line
[COMMAND_LINE_SIZE
] = { 0, };
76 static struct resource code_resource
= {
77 .name
= "Kernel code",
78 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
81 static struct resource data_resource
= {
82 .name
= "Kernel data",
83 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
86 static struct resource bss_resource
= {
88 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
91 unsigned long memory_start
;
92 EXPORT_SYMBOL(memory_start
);
93 unsigned long memory_end
= 0;
94 EXPORT_SYMBOL(memory_end
);
96 static struct resource mem_resources
[MAX_NUMNODES
];
98 int l1i_cache_shape
, l1d_cache_shape
, l2_cache_shape
;
100 static int __init
early_parse_mem(char *p
)
104 memory_start
= (unsigned long)__va(__MEMORY_START
);
105 size
= memparse(p
, &p
);
107 if (size
> __MEMORY_SIZE
) {
109 "Using mem= to increase the size of kernel memory "
111 " Recompile the kernel with the correct value for "
112 "CONFIG_MEMORY_SIZE.\n");
116 memory_end
= memory_start
+ size
;
120 early_param("mem", early_parse_mem
);
123 * Register fully available low RAM pages with the bootmem allocator.
125 static void __init
register_bootmem_low_pages(void)
127 unsigned long curr_pfn
, last_pfn
, pages
;
130 * We are rounding up the start address of usable memory:
132 curr_pfn
= PFN_UP(__MEMORY_START
);
135 * ... and at the end of the usable range downwards:
137 last_pfn
= PFN_DOWN(__pa(memory_end
));
139 if (last_pfn
> max_low_pfn
)
140 last_pfn
= max_low_pfn
;
142 pages
= last_pfn
- curr_pfn
;
143 free_bootmem(PFN_PHYS(curr_pfn
), PFN_PHYS(pages
));
147 static void __init
reserve_crashkernel(void)
149 unsigned long long free_mem
;
150 unsigned long long crash_size
, crash_base
;
154 free_mem
= ((unsigned long long)max_low_pfn
- min_low_pfn
) << PAGE_SHIFT
;
156 ret
= parse_crashkernel(boot_command_line
, free_mem
,
157 &crash_size
, &crash_base
);
158 if (ret
== 0 && crash_size
) {
159 if (crash_base
<= 0) {
160 vp
= alloc_bootmem_nopanic(crash_size
);
162 printk(KERN_INFO
"crashkernel allocation "
166 crash_base
= __pa(vp
);
167 } else if (reserve_bootmem(crash_base
, crash_size
,
168 BOOTMEM_EXCLUSIVE
) < 0) {
169 printk(KERN_INFO
"crashkernel reservation failed - "
170 "memory is in use\n");
174 printk(KERN_INFO
"Reserving %ldMB of memory at %ldMB "
175 "for crashkernel (System RAM: %ldMB)\n",
176 (unsigned long)(crash_size
>> 20),
177 (unsigned long)(crash_base
>> 20),
178 (unsigned long)(free_mem
>> 20));
179 crashk_res
.start
= crash_base
;
180 crashk_res
.end
= crash_base
+ crash_size
- 1;
181 insert_resource(&iomem_resource
, &crashk_res
);
185 static inline void __init
reserve_crashkernel(void)
189 void __cpuinit
calibrate_delay(void)
191 struct clk
*clk
= clk_get(NULL
, "cpu_clk");
194 panic("Need a sane CPU clock definition!");
196 loops_per_jiffy
= (clk_get_rate(clk
) >> 1) / HZ
;
198 printk(KERN_INFO
"Calibrating delay loop (skipped)... "
199 "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
200 loops_per_jiffy
/(500000/HZ
),
201 (loops_per_jiffy
/(5000/HZ
)) % 100,
205 void __init
__add_active_range(unsigned int nid
, unsigned long start_pfn
,
206 unsigned long end_pfn
)
208 struct resource
*res
= &mem_resources
[nid
];
210 WARN_ON(res
->name
); /* max one active range per node for now */
212 res
->name
= "System RAM";
213 res
->start
= start_pfn
<< PAGE_SHIFT
;
214 res
->end
= (end_pfn
<< PAGE_SHIFT
) - 1;
215 res
->flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
216 if (request_resource(&iomem_resource
, res
)) {
217 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
223 * We don't know which RAM region contains kernel data,
224 * so we try it repeatedly and let the resource manager
227 request_resource(res
, &code_resource
);
228 request_resource(res
, &data_resource
);
229 request_resource(res
, &bss_resource
);
231 add_active_range(nid
, start_pfn
, end_pfn
);
234 void __init
setup_bootmem_allocator(unsigned long free_pfn
)
236 unsigned long bootmap_size
;
237 unsigned long bootmap_pages
, bootmem_paddr
;
238 u64 total_pages
= (lmb_end_of_DRAM() - __MEMORY_START
) >> PAGE_SHIFT
;
241 bootmap_pages
= bootmem_bootmap_pages(total_pages
);
243 bootmem_paddr
= lmb_alloc(bootmap_pages
<< PAGE_SHIFT
, PAGE_SIZE
);
246 * Find a proper area for the bootmem bitmap. After this
247 * bootstrap step all allocations (until the page allocator
248 * is intact) must be done via bootmem_alloc().
250 bootmap_size
= init_bootmem_node(NODE_DATA(0),
251 bootmem_paddr
>> PAGE_SHIFT
,
252 min_low_pfn
, max_low_pfn
);
254 /* Add active regions with valid PFNs. */
255 for (i
= 0; i
< lmb
.memory
.cnt
; i
++) {
256 unsigned long start_pfn
, end_pfn
;
257 start_pfn
= lmb
.memory
.region
[i
].base
>> PAGE_SHIFT
;
258 end_pfn
= start_pfn
+ lmb_size_pages(&lmb
.memory
, i
);
259 __add_active_range(0, start_pfn
, end_pfn
);
263 * Add all physical memory to the bootmem map and mark each
266 register_bootmem_low_pages();
268 /* Reserve the sections we're already using. */
269 for (i
= 0; i
< lmb
.reserved
.cnt
; i
++)
270 reserve_bootmem(lmb
.reserved
.region
[i
].base
,
271 lmb_size_bytes(&lmb
.reserved
, i
),
276 sparse_memory_present_with_active_regions(0);
278 #ifdef CONFIG_BLK_DEV_INITRD
279 ROOT_DEV
= Root_RAM0
;
281 if (LOADER_TYPE
&& INITRD_START
) {
282 unsigned long initrd_start_phys
= INITRD_START
+ __MEMORY_START
;
284 if (initrd_start_phys
+ INITRD_SIZE
<= PFN_PHYS(max_low_pfn
)) {
285 reserve_bootmem(initrd_start_phys
, INITRD_SIZE
,
287 initrd_start
= (unsigned long)__va(initrd_start_phys
);
288 initrd_end
= initrd_start
+ INITRD_SIZE
;
290 printk("initrd extends beyond end of memory "
291 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
292 initrd_start_phys
+ INITRD_SIZE
,
293 (unsigned long)PFN_PHYS(max_low_pfn
));
299 reserve_crashkernel();
302 #ifndef CONFIG_NEED_MULTIPLE_NODES
303 static void __init
setup_memory(void)
305 unsigned long start_pfn
;
306 u64 base
= min_low_pfn
<< PAGE_SHIFT
;
307 u64 size
= (max_low_pfn
<< PAGE_SHIFT
) - base
;
310 * Partially used pages are not usable - thus
311 * we are rounding upwards:
313 start_pfn
= PFN_UP(__pa(_end
));
318 * Reserve the kernel text and
319 * Reserve the bootmem bitmap. We do this in two steps (first step
320 * was init_bootmem()), because this catches the (definitely buggy)
321 * case of us accidentally initializing the bootmem allocator with
322 * an invalid RAM area.
324 lmb_reserve(__MEMORY_START
+ CONFIG_ZERO_PAGE_OFFSET
,
325 (PFN_PHYS(start_pfn
) + PAGE_SIZE
- 1) -
326 (__MEMORY_START
+ CONFIG_ZERO_PAGE_OFFSET
));
329 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
331 if (CONFIG_ZERO_PAGE_OFFSET
!= 0)
332 lmb_reserve(__MEMORY_START
, CONFIG_ZERO_PAGE_OFFSET
);
337 setup_bootmem_allocator(start_pfn
);
340 extern void __init
setup_memory(void);
344 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
345 * is_kdump_kernel() to determine if we are booting after a panic. Hence
346 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
348 #ifdef CONFIG_CRASH_DUMP
349 /* elfcorehdr= specifies the location of elf core header
350 * stored by the crashed kernel.
352 static int __init
parse_elfcorehdr(char *arg
)
356 elfcorehdr_addr
= memparse(arg
, &arg
);
359 early_param("elfcorehdr", parse_elfcorehdr
);
362 void __init
__attribute__ ((weak
)) plat_early_device_setup(void)
366 void __init
setup_arch(char **cmdline_p
)
370 ROOT_DEV
= old_decode_dev(ORIG_ROOT_DEV
);
372 printk(KERN_NOTICE
"Boot params:\n"
373 "... MOUNT_ROOT_RDONLY - %08lx\n"
374 "... RAMDISK_FLAGS - %08lx\n"
375 "... ORIG_ROOT_DEV - %08lx\n"
376 "... LOADER_TYPE - %08lx\n"
377 "... INITRD_START - %08lx\n"
378 "... INITRD_SIZE - %08lx\n",
379 MOUNT_ROOT_RDONLY
, RAMDISK_FLAGS
,
380 ORIG_ROOT_DEV
, LOADER_TYPE
,
381 INITRD_START
, INITRD_SIZE
);
383 #ifdef CONFIG_BLK_DEV_RAM
384 rd_image_start
= RAMDISK_FLAGS
& RAMDISK_IMAGE_START_MASK
;
385 rd_prompt
= ((RAMDISK_FLAGS
& RAMDISK_PROMPT_FLAG
) != 0);
386 rd_doload
= ((RAMDISK_FLAGS
& RAMDISK_LOAD_FLAG
) != 0);
389 if (!MOUNT_ROOT_RDONLY
)
390 root_mountflags
&= ~MS_RDONLY
;
391 init_mm
.start_code
= (unsigned long) _text
;
392 init_mm
.end_code
= (unsigned long) _etext
;
393 init_mm
.end_data
= (unsigned long) _edata
;
394 init_mm
.brk
= (unsigned long) _end
;
396 code_resource
.start
= virt_to_phys(_text
);
397 code_resource
.end
= virt_to_phys(_etext
)-1;
398 data_resource
.start
= virt_to_phys(_etext
);
399 data_resource
.end
= virt_to_phys(_edata
)-1;
400 bss_resource
.start
= virt_to_phys(__bss_start
);
401 bss_resource
.end
= virt_to_phys(_ebss
)-1;
403 memory_start
= (unsigned long)__va(__MEMORY_START
);
405 memory_end
= memory_start
+ __MEMORY_SIZE
;
407 #ifdef CONFIG_CMDLINE_BOOL
408 strlcpy(command_line
, CONFIG_CMDLINE
, sizeof(command_line
));
410 strlcpy(command_line
, COMMAND_LINE
, sizeof(command_line
));
413 /* Save unparsed command line copy for /proc/cmdline */
414 memcpy(boot_command_line
, command_line
, COMMAND_LINE_SIZE
);
415 *cmdline_p
= command_line
;
419 plat_early_device_setup();
424 * Find the highest page frame number we have available
426 max_pfn
= PFN_DOWN(__pa(memory_end
));
429 * Determine low and high memory ranges:
431 max_low_pfn
= max_pfn
;
432 min_low_pfn
= __MEMORY_START
>> PAGE_SHIFT
;
434 nodes_clear(node_online_map
);
436 /* Setup bootmem with available RAM */
441 #ifdef CONFIG_DUMMY_CONSOLE
442 conswitchp
= &dummy_con
;
445 /* Perform the machine specific initialisation */
446 if (likely(sh_mv
.mv_setup
))
447 sh_mv
.mv_setup(cmdline_p
);
456 /* processor boot mode configuration */
457 int generic_mode_pins(void)
459 pr_warning("generic_mode_pins(): missing mode pin configuration\n");
463 int test_mode_pin(int pin
)
465 return sh_mv
.mv_mode_pins() & pin
;
468 static const char *cpu_name
[] = {
469 [CPU_SH7201
] = "SH7201",
470 [CPU_SH7203
] = "SH7203", [CPU_SH7263
] = "SH7263",
471 [CPU_SH7206
] = "SH7206", [CPU_SH7619
] = "SH7619",
472 [CPU_SH7705
] = "SH7705", [CPU_SH7706
] = "SH7706",
473 [CPU_SH7707
] = "SH7707", [CPU_SH7708
] = "SH7708",
474 [CPU_SH7709
] = "SH7709", [CPU_SH7710
] = "SH7710",
475 [CPU_SH7712
] = "SH7712", [CPU_SH7720
] = "SH7720",
476 [CPU_SH7721
] = "SH7721", [CPU_SH7729
] = "SH7729",
477 [CPU_SH7750
] = "SH7750", [CPU_SH7750S
] = "SH7750S",
478 [CPU_SH7750R
] = "SH7750R", [CPU_SH7751
] = "SH7751",
479 [CPU_SH7751R
] = "SH7751R", [CPU_SH7760
] = "SH7760",
480 [CPU_SH4_202
] = "SH4-202", [CPU_SH4_501
] = "SH4-501",
481 [CPU_SH7763
] = "SH7763", [CPU_SH7770
] = "SH7770",
482 [CPU_SH7780
] = "SH7780", [CPU_SH7781
] = "SH7781",
483 [CPU_SH7343
] = "SH7343", [CPU_SH7785
] = "SH7785",
484 [CPU_SH7786
] = "SH7786",
485 [CPU_SH7722
] = "SH7722", [CPU_SHX3
] = "SH-X3",
486 [CPU_SH5_101
] = "SH5-101", [CPU_SH5_103
] = "SH5-103",
487 [CPU_MXG
] = "MX-G", [CPU_SH7723
] = "SH7723",
488 [CPU_SH7366
] = "SH7366", [CPU_SH7724
] = "SH7724",
489 [CPU_SH_NONE
] = "Unknown"
492 const char *get_cpu_subtype(struct sh_cpuinfo
*c
)
494 return cpu_name
[c
->type
];
496 EXPORT_SYMBOL(get_cpu_subtype
);
498 #ifdef CONFIG_PROC_FS
499 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
500 static const char *cpu_flags
[] = {
501 "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
502 "ptea", "llsc", "l2", "op32", "pteaex", NULL
505 static void show_cpuflags(struct seq_file
*m
, struct sh_cpuinfo
*c
)
509 seq_printf(m
, "cpu flags\t:");
512 seq_printf(m
, " %s\n", cpu_flags
[0]);
516 for (i
= 0; cpu_flags
[i
]; i
++)
517 if ((c
->flags
& (1 << i
)))
518 seq_printf(m
, " %s", cpu_flags
[i
+1]);
523 static void show_cacheinfo(struct seq_file
*m
, const char *type
,
524 struct cache_info info
)
526 unsigned int cache_size
;
528 cache_size
= info
.ways
* info
.sets
* info
.linesz
;
530 seq_printf(m
, "%s size\t: %2dKiB (%d-way)\n",
531 type
, cache_size
>> 10, info
.ways
);
535 * Get CPU information for use by the procfs.
537 static int show_cpuinfo(struct seq_file
*m
, void *v
)
539 struct sh_cpuinfo
*c
= v
;
540 unsigned int cpu
= c
- cpu_data
;
542 if (!cpu_online(cpu
))
546 seq_printf(m
, "machine\t\t: %s\n", get_system_type());
548 seq_printf(m
, "processor\t: %d\n", cpu
);
549 seq_printf(m
, "cpu family\t: %s\n", init_utsname()->machine
);
550 seq_printf(m
, "cpu type\t: %s\n", get_cpu_subtype(c
));
551 if (c
->cut_major
== -1)
552 seq_printf(m
, "cut\t\t: unknown\n");
553 else if (c
->cut_minor
== -1)
554 seq_printf(m
, "cut\t\t: %d.x\n", c
->cut_major
);
556 seq_printf(m
, "cut\t\t: %d.%d\n", c
->cut_major
, c
->cut_minor
);
560 seq_printf(m
, "cache type\t: ");
563 * Check for what type of cache we have, we support both the
564 * unified cache on the SH-2 and SH-3, as well as the harvard
565 * style cache on the SH-4.
567 if (c
->icache
.flags
& SH_CACHE_COMBINED
) {
568 seq_printf(m
, "unified\n");
569 show_cacheinfo(m
, "cache", c
->icache
);
571 seq_printf(m
, "split (harvard)\n");
572 show_cacheinfo(m
, "icache", c
->icache
);
573 show_cacheinfo(m
, "dcache", c
->dcache
);
576 /* Optional secondary cache */
577 if (c
->flags
& CPU_HAS_L2_CACHE
)
578 show_cacheinfo(m
, "scache", c
->scache
);
580 seq_printf(m
, "bogomips\t: %lu.%02lu\n",
581 c
->loops_per_jiffy
/(500000/HZ
),
582 (c
->loops_per_jiffy
/(5000/HZ
)) % 100);
587 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
589 return *pos
< NR_CPUS
? cpu_data
+ *pos
: NULL
;
591 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
594 return c_start(m
, pos
);
596 static void c_stop(struct seq_file
*m
, void *v
)
599 const struct seq_operations cpuinfo_op
= {
603 .show
= show_cpuinfo
,
605 #endif /* CONFIG_PROC_FS */
607 struct dentry
*sh_debugfs_root
;
609 static int __init
sh_debugfs_init(void)
611 sh_debugfs_root
= debugfs_create_dir("sh", NULL
);
612 if (!sh_debugfs_root
)
614 if (IS_ERR(sh_debugfs_root
))
615 return PTR_ERR(sh_debugfs_root
);
619 arch_initcall(sh_debugfs_init
);