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
parse_mem_cmdline(char ** cmdline_p)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
setup_memory(void)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 BOOTMEM_DEFAULT);
182
183 /*
184 * reserve physical page 0 - it's a special BIOS page on many boxes,
185 * enabling clean reboots, SMP operation, laptop functions.
186 */
187 reserve_bootmem(CONFIG_MEMORY_START, PAGE_SIZE, BOOTMEM_DEFAULT);
188
189 /*
190 * reserve memory hole
191 */
192 #ifdef CONFIG_MEMHOLE
193 reserve_bootmem(CONFIG_MEMHOLE_START, CONFIG_MEMHOLE_SIZE,
194 BOOTMEM_DEFAULT);
195 #endif
196
197 #ifdef CONFIG_BLK_DEV_INITRD
198 if (LOADER_TYPE && INITRD_START) {
199 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
200 reserve_bootmem(INITRD_START, INITRD_SIZE,
201 BOOTMEM_DEFAULT);
202 initrd_start = INITRD_START + PAGE_OFFSET;
203 initrd_end = initrd_start + INITRD_SIZE;
204 printk("initrd:start[%08lx],size[%08lx]\n",
205 initrd_start, INITRD_SIZE);
206 } else {
207 printk("initrd extends beyond end of memory "
208 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
209 INITRD_START + INITRD_SIZE,
210 max_low_pfn << PAGE_SHIFT);
211
212 initrd_start = 0;
213 }
214 }
215 #endif
216
217 return max_low_pfn;
218 }
219 #else /* CONFIG_DISCONTIGMEM */
220 extern unsigned long setup_memory(void);
221 #endif /* CONFIG_DISCONTIGMEM */
222
setup_arch(char ** cmdline_p)223 void __init setup_arch(char **cmdline_p)
224 {
225 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
226
227 boot_cpu_data.cpu_clock = M32R_CPUCLK;
228 boot_cpu_data.bus_clock = M32R_BUSCLK;
229 boot_cpu_data.timer_divide = M32R_TIMER_DIVIDE;
230
231 #ifdef CONFIG_BLK_DEV_RAM
232 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
233 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
234 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
235 #endif
236
237 if (!MOUNT_ROOT_RDONLY)
238 root_mountflags &= ~MS_RDONLY;
239
240 #ifdef CONFIG_VT
241 #if defined(CONFIG_VGA_CONSOLE)
242 conswitchp = &vga_con;
243 #elif defined(CONFIG_DUMMY_CONSOLE)
244 conswitchp = &dummy_con;
245 #endif
246 #endif
247
248 #ifdef CONFIG_DISCONTIGMEM
249 nodes_clear(node_online_map);
250 node_set_online(0);
251 node_set_online(1);
252 #endif /* CONFIG_DISCONTIGMEM */
253
254 init_mm.start_code = (unsigned long) _text;
255 init_mm.end_code = (unsigned long) _etext;
256 init_mm.end_data = (unsigned long) _edata;
257 init_mm.brk = (unsigned long) _end;
258
259 code_resource.start = virt_to_phys(_text);
260 code_resource.end = virt_to_phys(_etext)-1;
261 data_resource.start = virt_to_phys(_etext);
262 data_resource.end = virt_to_phys(_edata)-1;
263
264 parse_mem_cmdline(cmdline_p);
265
266 setup_memory();
267
268 paging_init();
269 }
270
271 static struct cpu cpu_devices[NR_CPUS];
272
topology_init(void)273 static int __init topology_init(void)
274 {
275 int i;
276
277 for_each_present_cpu(i)
278 register_cpu(&cpu_devices[i], i);
279
280 return 0;
281 }
282
283 subsys_initcall(topology_init);
284
285 #ifdef CONFIG_PROC_FS
286 /*
287 * Get CPU information for use by the procfs.
288 */
show_cpuinfo(struct seq_file * m,void * v)289 static int show_cpuinfo(struct seq_file *m, void *v)
290 {
291 struct cpuinfo_m32r *c = v;
292 unsigned long cpu = c - cpu_data;
293
294 #ifdef CONFIG_SMP
295 if (!cpu_online(cpu))
296 return 0;
297 #endif /* CONFIG_SMP */
298
299 seq_printf(m, "processor\t: %ld\n", cpu);
300
301 #if defined(CONFIG_CHIP_VDEC2)
302 seq_printf(m, "cpu family\t: VDEC2\n"
303 "cache size\t: Unknown\n");
304 #elif defined(CONFIG_CHIP_M32700)
305 seq_printf(m,"cpu family\t: M32700\n"
306 "cache size\t: I-8KB/D-8KB\n");
307 #elif defined(CONFIG_CHIP_M32102)
308 seq_printf(m,"cpu family\t: M32102\n"
309 "cache size\t: I-8KB\n");
310 #elif defined(CONFIG_CHIP_OPSP)
311 seq_printf(m,"cpu family\t: OPSP\n"
312 "cache size\t: I-8KB/D-8KB\n");
313 #elif defined(CONFIG_CHIP_MP)
314 seq_printf(m, "cpu family\t: M32R-MP\n"
315 "cache size\t: I-xxKB/D-xxKB\n");
316 #elif defined(CONFIG_CHIP_M32104)
317 seq_printf(m,"cpu family\t: M32104\n"
318 "cache size\t: I-8KB/D-8KB\n");
319 #else
320 seq_printf(m, "cpu family\t: Unknown\n");
321 #endif
322 seq_printf(m, "bogomips\t: %lu.%02lu\n",
323 c->loops_per_jiffy/(500000/HZ),
324 (c->loops_per_jiffy/(5000/HZ)) % 100);
325 #if defined(CONFIG_PLAT_MAPPI)
326 seq_printf(m, "Machine\t\t: Mappi Evaluation board\n");
327 #elif defined(CONFIG_PLAT_MAPPI2)
328 seq_printf(m, "Machine\t\t: Mappi-II Evaluation board\n");
329 #elif defined(CONFIG_PLAT_MAPPI3)
330 seq_printf(m, "Machine\t\t: Mappi-III Evaluation board\n");
331 #elif defined(CONFIG_PLAT_M32700UT)
332 seq_printf(m, "Machine\t\t: M32700UT Evaluation board\n");
333 #elif defined(CONFIG_PLAT_OPSPUT)
334 seq_printf(m, "Machine\t\t: OPSPUT Evaluation board\n");
335 #elif defined(CONFIG_PLAT_USRV)
336 seq_printf(m, "Machine\t\t: uServer\n");
337 #elif defined(CONFIG_PLAT_OAKS32R)
338 seq_printf(m, "Machine\t\t: OAKS32R\n");
339 #elif defined(CONFIG_PLAT_M32104UT)
340 seq_printf(m, "Machine\t\t: M3T-M32104UT uT Engine board\n");
341 #else
342 seq_printf(m, "Machine\t\t: Unknown\n");
343 #endif
344
345 #define PRINT_CLOCK(name, value) \
346 seq_printf(m, name " clock\t: %d.%02dMHz\n", \
347 ((value) / 1000000), ((value) % 1000000)/10000)
348
349 PRINT_CLOCK("CPU", (int)c->cpu_clock);
350 PRINT_CLOCK("Bus", (int)c->bus_clock);
351
352 seq_printf(m, "\n");
353
354 return 0;
355 }
356
c_start(struct seq_file * m,loff_t * pos)357 static void *c_start(struct seq_file *m, loff_t *pos)
358 {
359 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
360 }
361
c_next(struct seq_file * m,void * v,loff_t * pos)362 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
363 {
364 ++*pos;
365 return c_start(m, pos);
366 }
367
c_stop(struct seq_file * m,void * v)368 static void c_stop(struct seq_file *m, void *v)
369 {
370 }
371
372 const struct seq_operations cpuinfo_op = {
373 .start = c_start,
374 .next = c_next,
375 .stop = c_stop,
376 .show = show_cpuinfo,
377 };
378 #endif /* CONFIG_PROC_FS */
379
380 unsigned long cpu_initialized __initdata = 0;
381
382 /*
383 * cpu_init() initializes state that is per-CPU. Some data is already
384 * initialized (naturally) in the bootstrap process.
385 * We reload them nevertheless, this function acts as a
386 * 'CPU state barrier', nothing should get across.
387 */
388 #if defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_XNUX2) \
389 || defined(CONFIG_CHIP_M32700) || defined(CONFIG_CHIP_M32102) \
390 || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104)
cpu_init(void)391 void __init cpu_init (void)
392 {
393 int cpu_id = smp_processor_id();
394
395 if (test_and_set_bit(cpu_id, &cpu_initialized)) {
396 printk(KERN_WARNING "CPU#%d already initialized!\n", cpu_id);
397 for ( ; ; )
398 local_irq_enable();
399 }
400 printk(KERN_INFO "Initializing CPU#%d\n", cpu_id);
401
402 /* Set up and load the per-CPU TSS and LDT */
403 atomic_inc(&init_mm.mm_count);
404 current->active_mm = &init_mm;
405 if (current->mm)
406 BUG();
407
408 /* Force FPU initialization */
409 current_thread_info()->status = 0;
410 clear_used_math();
411
412 #ifdef CONFIG_MMU
413 /* Set up MMU */
414 init_mmu();
415 #endif
416
417 /* Set up ICUIMASK */
418 outl(0x00070000, M32R_ICU_IMASK_PORTL); /* imask=111 */
419 }
420 #endif /* defined(CONFIG_CHIP_VDEC2) ... */
421