2 * Copyright (C) 2004-2006 Atmel Corporation
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.
10 #include <linux/init.h>
11 #include <linux/initrd.h>
12 #include <linux/sched.h>
13 #include <linux/console.h>
14 #include <linux/ioport.h>
15 #include <linux/bootmem.h>
17 #include <linux/module.h>
18 #include <linux/pfn.h>
19 #include <linux/root_dev.h>
20 #include <linux/cpu.h>
21 #include <linux/kernel.h>
23 #include <asm/sections.h>
24 #include <asm/processor.h>
25 #include <asm/pgtable.h>
26 #include <asm/setup.h>
27 #include <asm/sysreg.h>
29 #include <asm/arch/board.h>
30 #include <asm/arch/init.h>
32 extern int root_mountflags;
35 * Initialize loops_per_jiffy as 5000000 (500MIPS).
36 * Better make it too large than too small...
38 struct avr32_cpuinfo boot_cpu_data = {
39 .loops_per_jiffy = 5000000
41 EXPORT_SYMBOL(boot_cpu_data);
43 static char __initdata command_line[COMMAND_LINE_SIZE];
46 * Standard memory resources
48 static struct resource __initdata kernel_data = {
49 .name = "Kernel data",
52 .flags = IORESOURCE_MEM,
54 static struct resource __initdata kernel_code = {
55 .name = "Kernel code",
58 .flags = IORESOURCE_MEM,
59 .sibling = &kernel_data,
63 * Available system RAM and reserved regions as singly linked
64 * lists. These lists are traversed using the sibling pointer in
65 * struct resource and are kept sorted at all times.
67 static struct resource *__initdata system_ram;
68 static struct resource *__initdata reserved = &kernel_code;
71 * We need to allocate these before the bootmem allocator is up and
72 * running, so we need this "cache". 32 entries are probably enough
73 * for all but the most insanely complex systems.
75 static struct resource __initdata res_cache[32];
76 static unsigned int __initdata res_cache_next_free;
78 static void __init resource_init(void)
80 struct resource *mem, *res;
83 kernel_code.start = __pa(init_mm.start_code);
85 for (mem = system_ram; mem; mem = mem->sibling) {
86 new = alloc_bootmem_low(sizeof(struct resource));
87 memcpy(new, mem, sizeof(struct resource));
90 if (request_resource(&iomem_resource, new))
91 printk(KERN_WARNING "Bad RAM resource %08x-%08x\n",
92 mem->start, mem->end);
95 for (res = reserved; res; res = res->sibling) {
96 new = alloc_bootmem_low(sizeof(struct resource));
97 memcpy(new, res, sizeof(struct resource));
100 if (insert_resource(&iomem_resource, new))
102 "Bad reserved resource %s (%08x-%08x)\n",
103 res->name, res->start, res->end);
108 add_physical_memory(resource_size_t start, resource_size_t end)
110 struct resource *new, *next, **pprev;
112 for (pprev = &system_ram, next = system_ram; next;
113 pprev = &next->sibling, next = next->sibling) {
114 if (end < next->start)
116 if (start <= next->end) {
118 "Warning: Physical memory map is broken\n");
120 "Warning: %08x-%08x overlaps %08x-%08x\n",
121 start, end, next->start, next->end);
126 if (res_cache_next_free >= ARRAY_SIZE(res_cache)) {
128 "Warning: Failed to add physical memory %08x-%08x\n",
133 new = &res_cache[res_cache_next_free++];
136 new->name = "System RAM";
137 new->flags = IORESOURCE_MEM;
143 add_reserved_region(resource_size_t start, resource_size_t end,
146 struct resource *new, *next, **pprev;
151 if (res_cache_next_free >= ARRAY_SIZE(res_cache))
154 for (pprev = &reserved, next = reserved; next;
155 pprev = &next->sibling, next = next->sibling) {
156 if (end < next->start)
158 if (start <= next->end)
162 new = &res_cache[res_cache_next_free++];
166 new->flags = IORESOURCE_MEM;
173 static unsigned long __init
174 find_free_region(const struct resource *mem, resource_size_t size,
175 resource_size_t align)
177 struct resource *res;
178 unsigned long target;
180 target = ALIGN(mem->start, align);
181 for (res = reserved; res; res = res->sibling) {
182 if ((target + size) <= res->start)
184 if (target <= res->end)
185 target = ALIGN(res->end + 1, align);
188 if ((target + size) > (mem->end + 1))
195 * Early framebuffer allocation. Works as follows:
196 * - If fbmem_size is zero, nothing will be allocated or reserved.
197 * - If fbmem_start is zero when setup_bootmem() is called,
198 * fbmem_size bytes will be allocated from the bootmem allocator.
199 * - If fbmem_start is nonzero, an area of size fbmem_size will be
200 * reserved at the physical address fbmem_start if necessary. If
201 * the area isn't in a memory region known to the kernel, it will
204 * Board-specific code may use these variables to set up platform data
205 * for the framebuffer driver if fbmem_size is nonzero.
207 static unsigned long __initdata fbmem_start;
208 static unsigned long __initdata fbmem_size;
211 * "fbmem=xxx[kKmM]" allocates the specified amount of boot memory for
212 * use as framebuffer.
214 * "fbmem=xxx[kKmM]@yyy[kKmM]" defines a memory region of size xxx and
215 * starting at yyy to be reserved for use as framebuffer.
217 * The kernel won't verify that the memory region starting at yyy
218 * actually contains usable RAM.
220 static int __init early_parse_fbmem(char *p)
222 fbmem_size = memparse(p, &p);
224 fbmem_start = memparse(p, &p);
227 early_param("fbmem", early_parse_fbmem);
229 static int __init parse_tag_core(struct tag *tag)
231 if (tag->hdr.size > 2) {
232 if ((tag->u.core.flags & 1) == 0)
233 root_mountflags &= ~MS_RDONLY;
234 ROOT_DEV = new_decode_dev(tag->u.core.rootdev);
238 __tagtable(ATAG_CORE, parse_tag_core);
240 static int __init parse_tag_mem(struct tag *tag)
242 unsigned long start, end;
245 * Ignore zero-sized entries. If we're running standalone, the
246 * SDRAM code may emit such entries if something goes
249 if (tag->u.mem_range.size == 0)
252 start = tag->u.mem_range.addr;
253 end = tag->u.mem_range.addr + tag->u.mem_range.size - 1;
255 add_physical_memory(start, end);
258 __tagtable(ATAG_MEM, parse_tag_mem);
260 static int __init parse_tag_rdimg(struct tag *tag)
263 struct tag_mem_range *mem = &tag->u.mem_range;
268 "Warning: Only the first initrd image will be used\n");
272 ret = add_reserved_region(mem->start, mem->start + mem->size - 1,
276 "Warning: Failed to reserve initrd memory\n");
280 initrd_start = (unsigned long)__va(mem->addr);
281 initrd_end = initrd_start + mem->size;
283 printk(KERN_WARNING "RAM disk image present, but "
284 "no initrd support in kernel, ignoring\n");
289 __tagtable(ATAG_RDIMG, parse_tag_rdimg);
291 static int __init parse_tag_rsvd_mem(struct tag *tag)
293 struct tag_mem_range *mem = &tag->u.mem_range;
295 return add_reserved_region(mem->addr, mem->addr + mem->size - 1,
298 __tagtable(ATAG_RSVD_MEM, parse_tag_rsvd_mem);
300 static int __init parse_tag_cmdline(struct tag *tag)
302 strlcpy(boot_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
305 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
307 static int __init parse_tag_clock(struct tag *tag)
310 * We'll figure out the clocks by peeking at the system
311 * manager regs directly.
315 __tagtable(ATAG_CLOCK, parse_tag_clock);
318 * Scan the tag table for this tag, and call its parse function. The
319 * tag table is built by the linker from all the __tagtable
322 static int __init parse_tag(struct tag *tag)
324 extern struct tagtable __tagtable_begin, __tagtable_end;
327 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
328 if (tag->hdr.tag == t->tag) {
333 return t < &__tagtable_end;
337 * Parse all tags in the list we got from the boot loader
339 static void __init parse_tags(struct tag *t)
341 for (; t->hdr.tag != ATAG_NONE; t = tag_next(t))
344 "Ignoring unrecognised tag 0x%08x\n",
349 * Find a free memory region large enough for storing the
352 static unsigned long __init
353 find_bootmap_pfn(const struct resource *mem)
355 unsigned long bootmap_pages, bootmap_len;
356 unsigned long node_pages = PFN_UP(mem->end - mem->start + 1);
357 unsigned long bootmap_start;
359 bootmap_pages = bootmem_bootmap_pages(node_pages);
360 bootmap_len = bootmap_pages << PAGE_SHIFT;
363 * Find a large enough region without reserved pages for
364 * storing the bootmem bitmap. We can take advantage of the
365 * fact that all lists have been sorted.
367 * We have to check that we don't collide with any reserved
368 * regions, which includes the kernel image and any RAMDISK
371 bootmap_start = find_free_region(mem, bootmap_len, PAGE_SIZE);
373 return bootmap_start >> PAGE_SHIFT;
376 #define MAX_LOWMEM HIGHMEM_START
377 #define MAX_LOWMEM_PFN PFN_DOWN(MAX_LOWMEM)
379 static void __init setup_bootmem(void)
381 unsigned bootmap_size;
382 unsigned long first_pfn, bootmap_pfn, pages;
383 unsigned long max_pfn, max_low_pfn;
385 struct resource *res;
387 printk(KERN_INFO "Physical memory:\n");
388 for (res = system_ram; res; res = res->sibling)
389 printk(" %08x-%08x\n", res->start, res->end);
390 printk(KERN_INFO "Reserved memory:\n");
391 for (res = reserved; res; res = res->sibling)
392 printk(" %08x-%08x: %s\n",
393 res->start, res->end, res->name);
395 nodes_clear(node_online_map);
397 if (system_ram->sibling)
398 printk(KERN_WARNING "Only using first memory bank\n");
400 for (res = system_ram; res; res = NULL) {
401 first_pfn = PFN_UP(res->start);
402 max_low_pfn = max_pfn = PFN_DOWN(res->end + 1);
403 bootmap_pfn = find_bootmap_pfn(res);
404 if (bootmap_pfn > max_pfn)
405 panic("No space for bootmem bitmap!\n");
407 if (max_low_pfn > MAX_LOWMEM_PFN) {
408 max_low_pfn = MAX_LOWMEM_PFN;
409 #ifndef CONFIG_HIGHMEM
411 * Lowmem is memory that can be addressed
412 * directly through P1/P2
415 "Node %u: Only %ld MiB of memory will be used.\n",
416 node, MAX_LOWMEM >> 20);
417 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
419 #error HIGHMEM is not supported by AVR32 yet
423 /* Initialize the boot-time allocator with low memory only. */
424 bootmap_size = init_bootmem_node(NODE_DATA(node), bootmap_pfn,
425 first_pfn, max_low_pfn);
428 * Register fully available RAM pages with the bootmem
431 pages = max_low_pfn - first_pfn;
432 free_bootmem_node (NODE_DATA(node), PFN_PHYS(first_pfn),
435 /* Reserve space for the bootmem bitmap... */
436 reserve_bootmem_node(NODE_DATA(node),
437 PFN_PHYS(bootmap_pfn),
440 /* ...and any other reserved regions. */
441 for (res = reserved; res; res = res->sibling) {
442 if (res->start > PFN_PHYS(max_pfn))
446 * resource_init will complain about partial
447 * overlaps, so we'll just ignore such
450 if (res->start >= PFN_PHYS(first_pfn)
451 && res->end < PFN_PHYS(max_pfn))
452 reserve_bootmem_node(
453 NODE_DATA(node), res->start,
454 res->end - res->start + 1);
457 node_set_online(node);
461 void __init setup_arch (char **cmdline_p)
465 init_mm.start_code = (unsigned long)_text;
466 init_mm.end_code = (unsigned long)_etext;
467 init_mm.end_data = (unsigned long)_edata;
468 init_mm.brk = (unsigned long)_end;
471 * Include .init section to make allocations easier. It will
472 * be removed before the resource is actually requested.
474 kernel_code.start = __pa(__init_begin);
475 kernel_code.end = __pa(init_mm.end_code - 1);
476 kernel_data.start = __pa(init_mm.end_code);
477 kernel_data.end = __pa(init_mm.brk - 1);
479 parse_tags(bootloader_tags);
485 cpu_clk = clk_get(NULL, "cpu");
486 if (IS_ERR(cpu_clk)) {
487 printk(KERN_WARNING "Warning: Unable to get CPU clock\n");
489 unsigned long cpu_hz = clk_get_rate(cpu_clk);
492 * Well, duh, but it's probably a good idea to
493 * increment the use count.
497 boot_cpu_data.clk = cpu_clk;
498 boot_cpu_data.loops_per_jiffy = cpu_hz * 4;
499 printk("CPU: Running at %lu.%03lu MHz\n",
500 ((cpu_hz + 500) / 1000) / 1000,
501 ((cpu_hz + 500) / 1000) % 1000);
504 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
505 *cmdline_p = command_line;
510 board_setup_fbmem(fbmem_start, fbmem_size);
513 conswitchp = &dummy_con;