Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/agpgart
[linux-2.6] / arch / m32r / kernel / setup.c
1 /*
2  *  linux/arch/m32r/kernel/setup.c
3  *
4  *  Setup routines for Renesas M32R
5  *
6  *  Copyright (c) 2001, 2002  Hiroyuki Kondo, Hirokazu Takata,
7  *                            Hitoshi Yamamoto
8  */
9
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/stddef.h>
13 #include <linux/fs.h>
14 #include <linux/sched.h>
15 #include <linux/ioport.h>
16 #include <linux/mm.h>
17 #include <linux/bootmem.h>
18 #include <linux/console.h>
19 #include <linux/initrd.h>
20 #include <linux/major.h>
21 #include <linux/root_dev.h>
22 #include <linux/seq_file.h>
23 #include <linux/timex.h>
24 #include <linux/screen_info.h>
25 #include <linux/cpu.h>
26 #include <linux/nodemask.h>
27 #include <linux/pfn.h>
28
29 #include <asm/processor.h>
30 #include <asm/pgtable.h>
31 #include <asm/io.h>
32 #include <asm/mmu_context.h>
33 #include <asm/m32r.h>
34 #include <asm/setup.h>
35 #include <asm/sections.h>
36
37 #ifdef CONFIG_MMU
38 extern void init_mmu(void);
39 #endif
40
41 extern char _end[];
42
43 /*
44  * Machine setup..
45  */
46 struct cpuinfo_m32r boot_cpu_data;
47
48 #ifdef CONFIG_BLK_DEV_RAM
49 extern int rd_doload;   /* 1 = load ramdisk, 0 = don't load */
50 extern int rd_prompt;   /* 1 = prompt for ramdisk, 0 = don't prompt */
51 extern int rd_image_start;      /* starting block # of image */
52 #endif
53
54 #if defined(CONFIG_VGA_CONSOLE)
55 struct screen_info screen_info = {
56         .orig_video_lines      = 25,
57         .orig_video_cols       = 80,
58         .orig_video_mode       = 0,
59         .orig_video_ega_bx     = 0,
60         .orig_video_isVGA      = 1,
61         .orig_video_points     = 8
62 };
63 #endif
64
65 extern int root_mountflags;
66
67 static char __initdata command_line[COMMAND_LINE_SIZE];
68
69 static struct resource data_resource = {
70         .name   = "Kernel data",
71         .start  = 0,
72         .end    = 0,
73         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
74 };
75
76 static struct resource code_resource = {
77         .name   = "Kernel code",
78         .start  = 0,
79         .end    = 0,
80         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
81 };
82
83 unsigned long memory_start;
84 unsigned long memory_end;
85
86 void __init setup_arch(char **);
87 int get_cpuinfo(char *);
88
89 static __inline__ void parse_mem_cmdline(char ** cmdline_p)
90 {
91         char c = ' ';
92         char *to = command_line;
93         char *from = COMMAND_LINE;
94         int len = 0;
95         int usermem = 0;
96
97         /* Save unparsed command line copy for /proc/cmdline */
98         memcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
99         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
100
101         memory_start = (unsigned long)CONFIG_MEMORY_START+PAGE_OFFSET;
102         memory_end = memory_start+(unsigned long)CONFIG_MEMORY_SIZE;
103
104         for ( ; ; ) {
105                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
106                         if (to != command_line)
107                                 to--;
108
109                         {
110                                 unsigned long mem_size;
111
112                                 usermem = 1;
113                                 mem_size = memparse(from+4, &from);
114                                 memory_end = memory_start + mem_size;
115                         }
116                 }
117                 c = *(from++);
118                 if (!c)
119                         break;
120
121                 if (COMMAND_LINE_SIZE <= ++len)
122                         break;
123
124                 *(to++) = c;
125         }
126         *to = '\0';
127         *cmdline_p = command_line;
128         if (usermem)
129                 printk(KERN_INFO "user-defined physical RAM map:\n");
130 }
131
132 #ifndef CONFIG_DISCONTIGMEM
133 static unsigned long __init setup_memory(void)
134 {
135         unsigned long start_pfn, max_low_pfn, bootmap_size;
136
137         start_pfn = PFN_UP( __pa(_end) );
138         max_low_pfn = PFN_DOWN( __pa(memory_end) );
139
140         /*
141          * Initialize the boot-time allocator (with low memory only):
142          */
143         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
144                 CONFIG_MEMORY_START>>PAGE_SHIFT, max_low_pfn);
145
146         /*
147          * Register fully available low RAM pages with the bootmem allocator.
148          */
149         {
150                 unsigned long curr_pfn;
151                 unsigned long last_pfn;
152                 unsigned long pages;
153
154                 /*
155                  * We are rounding up the start address of usable memory:
156                  */
157                 curr_pfn = PFN_UP(__pa(memory_start));
158
159                 /*
160                  * ... and at the end of the usable range downwards:
161                  */
162                 last_pfn = PFN_DOWN(__pa(memory_end));
163
164                 if (last_pfn > max_low_pfn)
165                         last_pfn = max_low_pfn;
166
167                 pages = last_pfn - curr_pfn;
168                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
169         }
170
171         /*
172          * Reserve the kernel text and
173          * Reserve the bootmem bitmap. We do this in two steps (first step
174          * was init_bootmem()), because this catches the (definitely buggy)
175          * case of us accidentally initializing the bootmem allocator with
176          * an invalid RAM area.
177          */
178         reserve_bootmem(CONFIG_MEMORY_START + PAGE_SIZE,
179                 (PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE - 1)
180                 - CONFIG_MEMORY_START);
181
182         /*
183          * reserve physical page 0 - it's a special BIOS page on many boxes,
184          * enabling clean reboots, SMP operation, laptop functions.
185          */
186         reserve_bootmem(CONFIG_MEMORY_START, PAGE_SIZE);
187
188         /*
189          * reserve memory hole
190          */
191 #ifdef CONFIG_MEMHOLE
192         reserve_bootmem(CONFIG_MEMHOLE_START, CONFIG_MEMHOLE_SIZE);
193 #endif
194
195 #ifdef CONFIG_BLK_DEV_INITRD
196         if (LOADER_TYPE && INITRD_START) {
197                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
198                         reserve_bootmem(INITRD_START, INITRD_SIZE);
199                         initrd_start = INITRD_START + PAGE_OFFSET;
200                         initrd_end = initrd_start + INITRD_SIZE;
201                         printk("initrd:start[%08lx],size[%08lx]\n",
202                                 initrd_start, INITRD_SIZE);
203                 } else {
204                         printk("initrd extends beyond end of memory "
205                                 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
206                                 INITRD_START + INITRD_SIZE,
207                                 max_low_pfn << PAGE_SHIFT);
208
209                         initrd_start = 0;
210                 }
211         }
212 #endif
213
214         return max_low_pfn;
215 }
216 #else   /* CONFIG_DISCONTIGMEM */
217 extern unsigned long setup_memory(void);
218 #endif  /* CONFIG_DISCONTIGMEM */
219
220 void __init setup_arch(char **cmdline_p)
221 {
222         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
223
224         boot_cpu_data.cpu_clock = M32R_CPUCLK;
225         boot_cpu_data.bus_clock = M32R_BUSCLK;
226         boot_cpu_data.timer_divide = M32R_TIMER_DIVIDE;
227
228 #ifdef CONFIG_BLK_DEV_RAM
229         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
230         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
231         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
232 #endif
233
234         if (!MOUNT_ROOT_RDONLY)
235                 root_mountflags &= ~MS_RDONLY;
236
237 #ifdef CONFIG_VT
238 #if defined(CONFIG_VGA_CONSOLE)
239         conswitchp = &vga_con;
240 #elif defined(CONFIG_DUMMY_CONSOLE)
241         conswitchp = &dummy_con;
242 #endif
243 #endif
244
245 #ifdef CONFIG_DISCONTIGMEM
246         nodes_clear(node_online_map);
247         node_set_online(0);
248         node_set_online(1);
249 #endif  /* CONFIG_DISCONTIGMEM */
250
251         init_mm.start_code = (unsigned long) _text;
252         init_mm.end_code = (unsigned long) _etext;
253         init_mm.end_data = (unsigned long) _edata;
254         init_mm.brk = (unsigned long) _end;
255
256         code_resource.start = virt_to_phys(_text);
257         code_resource.end = virt_to_phys(_etext)-1;
258         data_resource.start = virt_to_phys(_etext);
259         data_resource.end = virt_to_phys(_edata)-1;
260
261         parse_mem_cmdline(cmdline_p);
262
263         setup_memory();
264
265         paging_init();
266 }
267
268 static struct cpu cpu_devices[NR_CPUS];
269
270 static int __init topology_init(void)
271 {
272         int i;
273
274         for_each_present_cpu(i)
275                 register_cpu(&cpu_devices[i], i);
276
277         return 0;
278 }
279
280 subsys_initcall(topology_init);
281
282 #ifdef CONFIG_PROC_FS
283 /*
284  *      Get CPU information for use by the procfs.
285  */
286 static int show_cpuinfo(struct seq_file *m, void *v)
287 {
288         struct cpuinfo_m32r *c = v;
289         unsigned long cpu = c - cpu_data;
290
291 #ifdef CONFIG_SMP
292         if (!cpu_online(cpu))
293                 return 0;
294 #endif  /* CONFIG_SMP */
295
296         seq_printf(m, "processor\t: %ld\n", cpu);
297
298 #if defined(CONFIG_CHIP_VDEC2)
299         seq_printf(m, "cpu family\t: VDEC2\n"
300                 "cache size\t: Unknown\n");
301 #elif defined(CONFIG_CHIP_M32700)
302         seq_printf(m,"cpu family\t: M32700\n"
303                 "cache size\t: I-8KB/D-8KB\n");
304 #elif defined(CONFIG_CHIP_M32102)
305         seq_printf(m,"cpu family\t: M32102\n"
306                 "cache size\t: I-8KB\n");
307 #elif defined(CONFIG_CHIP_OPSP)
308         seq_printf(m,"cpu family\t: OPSP\n"
309                 "cache size\t: I-8KB/D-8KB\n");
310 #elif defined(CONFIG_CHIP_MP)
311         seq_printf(m, "cpu family\t: M32R-MP\n"
312                 "cache size\t: I-xxKB/D-xxKB\n");
313 #elif  defined(CONFIG_CHIP_M32104)
314         seq_printf(m,"cpu family\t: M32104\n"
315                 "cache size\t: I-8KB/D-8KB\n");
316 #else
317         seq_printf(m, "cpu family\t: Unknown\n");
318 #endif
319         seq_printf(m, "bogomips\t: %lu.%02lu\n",
320                 c->loops_per_jiffy/(500000/HZ),
321                 (c->loops_per_jiffy/(5000/HZ)) % 100);
322 #if defined(CONFIG_PLAT_MAPPI)
323         seq_printf(m, "Machine\t\t: Mappi Evaluation board\n");
324 #elif defined(CONFIG_PLAT_MAPPI2)
325         seq_printf(m, "Machine\t\t: Mappi-II Evaluation board\n");
326 #elif defined(CONFIG_PLAT_MAPPI3)
327         seq_printf(m, "Machine\t\t: Mappi-III Evaluation board\n");
328 #elif defined(CONFIG_PLAT_M32700UT)
329         seq_printf(m, "Machine\t\t: M32700UT Evaluation board\n");
330 #elif defined(CONFIG_PLAT_OPSPUT)
331         seq_printf(m, "Machine\t\t: OPSPUT Evaluation board\n");
332 #elif defined(CONFIG_PLAT_USRV)
333         seq_printf(m, "Machine\t\t: uServer\n");
334 #elif defined(CONFIG_PLAT_OAKS32R)
335         seq_printf(m, "Machine\t\t: OAKS32R\n");
336 #elif  defined(CONFIG_PLAT_M32104UT)
337         seq_printf(m, "Machine\t\t: M3T-M32104UT uT Engine board\n");
338 #else
339         seq_printf(m, "Machine\t\t: Unknown\n");
340 #endif
341
342 #define PRINT_CLOCK(name, value)                                \
343         seq_printf(m, name " clock\t: %d.%02dMHz\n",            \
344                 ((value) / 1000000), ((value) % 1000000)/10000)
345
346         PRINT_CLOCK("CPU", (int)c->cpu_clock);
347         PRINT_CLOCK("Bus", (int)c->bus_clock);
348
349         seq_printf(m, "\n");
350
351         return 0;
352 }
353
354 static void *c_start(struct seq_file *m, loff_t *pos)
355 {
356         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
357 }
358
359 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
360 {
361         ++*pos;
362         return c_start(m, pos);
363 }
364
365 static void c_stop(struct seq_file *m, void *v)
366 {
367 }
368
369 struct seq_operations cpuinfo_op = {
370         .start = c_start,
371         .next = c_next,
372         .stop = c_stop,
373         .show = show_cpuinfo,
374 };
375 #endif  /* CONFIG_PROC_FS */
376
377 unsigned long cpu_initialized __initdata = 0;
378
379 /*
380  * cpu_init() initializes state that is per-CPU. Some data is already
381  * initialized (naturally) in the bootstrap process.
382  * We reload them nevertheless, this function acts as a
383  * 'CPU state barrier', nothing should get across.
384  */
385 #if defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_XNUX2)    \
386         || defined(CONFIG_CHIP_M32700) || defined(CONFIG_CHIP_M32102) \
387         || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104)
388 void __init cpu_init (void)
389 {
390         int cpu_id = smp_processor_id();
391
392         if (test_and_set_bit(cpu_id, &cpu_initialized)) {
393                 printk(KERN_WARNING "CPU#%d already initialized!\n", cpu_id);
394                 for ( ; ; )
395                         local_irq_enable();
396         }
397         printk(KERN_INFO "Initializing CPU#%d\n", cpu_id);
398
399         /* Set up and load the per-CPU TSS and LDT */
400         atomic_inc(&init_mm.mm_count);
401         current->active_mm = &init_mm;
402         if (current->mm)
403                 BUG();
404
405         /* Force FPU initialization */
406         current_thread_info()->status = 0;
407         clear_used_math();
408
409 #ifdef CONFIG_MMU
410         /* Set up MMU */
411         init_mmu();
412 #endif
413
414         /* Set up ICUIMASK */
415         outl(0x00070000, M32R_ICU_IMASK_PORTL);         /* imask=111 */
416 }
417 #endif  /* defined(CONFIG_CHIP_VDEC2) ... */