1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/arch/m32r/kernel/setup.c
4 *
5 * Setup routines for Renesas M32R
6 *
7 * Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata,
8 * Hitoshi Yamamoto
9 */
10
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/stddef.h>
14 #include <linux/fs.h>
15 #include <linux/sched/mm.h>
16 #include <linux/ioport.h>
17 #include <linux/mm.h>
18 #include <linux/bootmem.h>
19 #include <linux/console.h>
20 #include <linux/initrd.h>
21 #include <linux/major.h>
22 #include <linux/root_dev.h>
23 #include <linux/seq_file.h>
24 #include <linux/timex.h>
25 #include <linux/screen_info.h>
26 #include <linux/cpu.h>
27 #include <linux/nodemask.h>
28 #include <linux/pfn.h>
29
30 #include <asm/processor.h>
31 #include <asm/pgtable.h>
32 #include <asm/io.h>
33 #include <asm/mmu_context.h>
34 #include <asm/m32r.h>
35 #include <asm/setup.h>
36 #include <asm/sections.h>
37
38 #ifdef CONFIG_MMU
39 extern void init_mmu(void);
40 #endif
41
42 extern char _end[];
43
44 /*
45 * Machine setup..
46 */
47 struct cpuinfo_m32r boot_cpu_data;
48
49 #ifdef CONFIG_BLK_DEV_RAM
50 extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */
51 extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt */
52 extern int rd_image_start; /* starting block # of image */
53 #endif
54
55 #if defined(CONFIG_VGA_CONSOLE)
56 struct screen_info screen_info = {
57 .orig_video_lines = 25,
58 .orig_video_cols = 80,
59 .orig_video_mode = 0,
60 .orig_video_ega_bx = 0,
61 .orig_video_isVGA = 1,
62 .orig_video_points = 8
63 };
64 #endif
65
66 extern int root_mountflags;
67
68 static char __initdata command_line[COMMAND_LINE_SIZE];
69
70 static struct resource data_resource = {
71 .name = "Kernel data",
72 .start = 0,
73 .end = 0,
74 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
75 };
76
77 static struct resource code_resource = {
78 .name = "Kernel code",
79 .start = 0,
80 .end = 0,
81 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
82 };
83
84 unsigned long memory_start;
85 EXPORT_SYMBOL(memory_start);
86
87 unsigned long memory_end;
88 EXPORT_SYMBOL(memory_end);
89
90 void __init setup_arch(char **);
91 int get_cpuinfo(char *);
92
parse_mem_cmdline(char ** cmdline_p)93 static __inline__ void parse_mem_cmdline(char ** cmdline_p)
94 {
95 char c = ' ';
96 char *to = command_line;
97 char *from = COMMAND_LINE;
98 int len = 0;
99 int usermem = 0;
100
101 /* Save unparsed command line copy for /proc/cmdline */
102 memcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
103 boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
104
105 memory_start = (unsigned long)CONFIG_MEMORY_START+PAGE_OFFSET;
106 memory_end = memory_start+(unsigned long)CONFIG_MEMORY_SIZE;
107
108 for ( ; ; ) {
109 if (c == ' ' && !memcmp(from, "mem=", 4)) {
110 if (to != command_line)
111 to--;
112
113 {
114 unsigned long mem_size;
115
116 usermem = 1;
117 mem_size = memparse(from+4, &from);
118 memory_end = memory_start + mem_size;
119 }
120 }
121 c = *(from++);
122 if (!c)
123 break;
124
125 if (COMMAND_LINE_SIZE <= ++len)
126 break;
127
128 *(to++) = c;
129 }
130 *to = '\0';
131 *cmdline_p = command_line;
132 if (usermem)
133 printk(KERN_INFO "user-defined physical RAM map:\n");
134 }
135
136 #ifndef CONFIG_DISCONTIGMEM
setup_memory(void)137 static unsigned long __init setup_memory(void)
138 {
139 unsigned long start_pfn, max_low_pfn, bootmap_size;
140
141 start_pfn = PFN_UP( __pa(_end) );
142 max_low_pfn = PFN_DOWN( __pa(memory_end) );
143
144 /*
145 * Initialize the boot-time allocator (with low memory only):
146 */
147 bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
148 CONFIG_MEMORY_START>>PAGE_SHIFT, max_low_pfn);
149
150 /*
151 * Register fully available low RAM pages with the bootmem allocator.
152 */
153 {
154 unsigned long curr_pfn;
155 unsigned long last_pfn;
156 unsigned long pages;
157
158 /*
159 * We are rounding up the start address of usable memory:
160 */
161 curr_pfn = PFN_UP(__pa(memory_start));
162
163 /*
164 * ... and at the end of the usable range downwards:
165 */
166 last_pfn = PFN_DOWN(__pa(memory_end));
167
168 if (last_pfn > max_low_pfn)
169 last_pfn = max_low_pfn;
170
171 pages = last_pfn - curr_pfn;
172 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
173 }
174
175 /*
176 * Reserve the kernel text and
177 * Reserve the bootmem bitmap. We do this in two steps (first step
178 * was init_bootmem()), because this catches the (definitely buggy)
179 * case of us accidentally initializing the bootmem allocator with
180 * an invalid RAM area.
181 */
182 reserve_bootmem(CONFIG_MEMORY_START + PAGE_SIZE,
183 (PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE - 1)
184 - CONFIG_MEMORY_START,
185 BOOTMEM_DEFAULT);
186
187 /*
188 * reserve physical page 0 - it's a special BIOS page on many boxes,
189 * enabling clean reboots, SMP operation, laptop functions.
190 */
191 reserve_bootmem(CONFIG_MEMORY_START, PAGE_SIZE, BOOTMEM_DEFAULT);
192
193 /*
194 * reserve memory hole
195 */
196 #ifdef CONFIG_MEMHOLE
197 reserve_bootmem(CONFIG_MEMHOLE_START, CONFIG_MEMHOLE_SIZE,
198 BOOTMEM_DEFAULT);
199 #endif
200
201 #ifdef CONFIG_BLK_DEV_INITRD
202 if (LOADER_TYPE && INITRD_START) {
203 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
204 reserve_bootmem(INITRD_START, INITRD_SIZE,
205 BOOTMEM_DEFAULT);
206 initrd_start = INITRD_START + PAGE_OFFSET;
207 initrd_end = initrd_start + INITRD_SIZE;
208 printk("initrd:start[%08lx],size[%08lx]\n",
209 initrd_start, INITRD_SIZE);
210 } else {
211 printk("initrd extends beyond end of memory "
212 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
213 INITRD_START + INITRD_SIZE,
214 max_low_pfn << PAGE_SHIFT);
215
216 initrd_start = 0;
217 }
218 }
219 #endif
220
221 return max_low_pfn;
222 }
223 #else /* CONFIG_DISCONTIGMEM */
224 extern unsigned long setup_memory(void);
225 #endif /* CONFIG_DISCONTIGMEM */
226
setup_arch(char ** cmdline_p)227 void __init setup_arch(char **cmdline_p)
228 {
229 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
230
231 boot_cpu_data.cpu_clock = M32R_CPUCLK;
232 boot_cpu_data.bus_clock = M32R_BUSCLK;
233 boot_cpu_data.timer_divide = M32R_TIMER_DIVIDE;
234
235 #ifdef CONFIG_BLK_DEV_RAM
236 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
237 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
238 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
239 #endif
240
241 if (!MOUNT_ROOT_RDONLY)
242 root_mountflags &= ~MS_RDONLY;
243
244 #ifdef CONFIG_VT
245 #if defined(CONFIG_VGA_CONSOLE)
246 conswitchp = &vga_con;
247 #elif defined(CONFIG_DUMMY_CONSOLE)
248 conswitchp = &dummy_con;
249 #endif
250 #endif
251
252 #ifdef CONFIG_DISCONTIGMEM
253 nodes_clear(node_online_map);
254 node_set_online(0);
255 node_set_online(1);
256 #endif /* CONFIG_DISCONTIGMEM */
257
258 init_mm.start_code = (unsigned long) _text;
259 init_mm.end_code = (unsigned long) _etext;
260 init_mm.end_data = (unsigned long) _edata;
261 init_mm.brk = (unsigned long) _end;
262
263 code_resource.start = virt_to_phys(_text);
264 code_resource.end = virt_to_phys(_etext)-1;
265 data_resource.start = virt_to_phys(_etext);
266 data_resource.end = virt_to_phys(_edata)-1;
267
268 parse_mem_cmdline(cmdline_p);
269
270 setup_memory();
271
272 paging_init();
273 }
274
275 static struct cpu cpu_devices[NR_CPUS];
276
topology_init(void)277 static int __init topology_init(void)
278 {
279 int i;
280
281 for_each_present_cpu(i)
282 register_cpu(&cpu_devices[i], i);
283
284 return 0;
285 }
286
287 subsys_initcall(topology_init);
288
289 #ifdef CONFIG_PROC_FS
290 /*
291 * Get CPU information for use by the procfs.
292 */
show_cpuinfo(struct seq_file * m,void * v)293 static int show_cpuinfo(struct seq_file *m, void *v)
294 {
295 struct cpuinfo_m32r *c = v;
296 unsigned long cpu = c - cpu_data;
297
298 #ifdef CONFIG_SMP
299 if (!cpu_online(cpu))
300 return 0;
301 #endif /* CONFIG_SMP */
302
303 seq_printf(m, "processor\t: %ld\n", cpu);
304
305 #if defined(CONFIG_CHIP_VDEC2)
306 seq_printf(m, "cpu family\t: VDEC2\n"
307 "cache size\t: Unknown\n");
308 #elif defined(CONFIG_CHIP_M32700)
309 seq_printf(m,"cpu family\t: M32700\n"
310 "cache size\t: I-8KB/D-8KB\n");
311 #elif defined(CONFIG_CHIP_M32102)
312 seq_printf(m,"cpu family\t: M32102\n"
313 "cache size\t: I-8KB\n");
314 #elif defined(CONFIG_CHIP_OPSP)
315 seq_printf(m,"cpu family\t: OPSP\n"
316 "cache size\t: I-8KB/D-8KB\n");
317 #elif defined(CONFIG_CHIP_MP)
318 seq_printf(m, "cpu family\t: M32R-MP\n"
319 "cache size\t: I-xxKB/D-xxKB\n");
320 #elif defined(CONFIG_CHIP_M32104)
321 seq_printf(m,"cpu family\t: M32104\n"
322 "cache size\t: I-8KB/D-8KB\n");
323 #else
324 seq_printf(m, "cpu family\t: Unknown\n");
325 #endif
326 seq_printf(m, "bogomips\t: %lu.%02lu\n",
327 c->loops_per_jiffy/(500000/HZ),
328 (c->loops_per_jiffy/(5000/HZ)) % 100);
329 #if defined(CONFIG_PLAT_MAPPI)
330 seq_printf(m, "Machine\t\t: Mappi Evaluation board\n");
331 #elif defined(CONFIG_PLAT_MAPPI2)
332 seq_printf(m, "Machine\t\t: Mappi-II Evaluation board\n");
333 #elif defined(CONFIG_PLAT_MAPPI3)
334 seq_printf(m, "Machine\t\t: Mappi-III Evaluation board\n");
335 #elif defined(CONFIG_PLAT_M32700UT)
336 seq_printf(m, "Machine\t\t: M32700UT Evaluation board\n");
337 #elif defined(CONFIG_PLAT_OPSPUT)
338 seq_printf(m, "Machine\t\t: OPSPUT Evaluation board\n");
339 #elif defined(CONFIG_PLAT_USRV)
340 seq_printf(m, "Machine\t\t: uServer\n");
341 #elif defined(CONFIG_PLAT_OAKS32R)
342 seq_printf(m, "Machine\t\t: OAKS32R\n");
343 #elif defined(CONFIG_PLAT_M32104UT)
344 seq_printf(m, "Machine\t\t: M3T-M32104UT uT Engine board\n");
345 #else
346 seq_printf(m, "Machine\t\t: Unknown\n");
347 #endif
348
349 #define PRINT_CLOCK(name, value) \
350 seq_printf(m, name " clock\t: %d.%02dMHz\n", \
351 ((value) / 1000000), ((value) % 1000000)/10000)
352
353 PRINT_CLOCK("CPU", (int)c->cpu_clock);
354 PRINT_CLOCK("Bus", (int)c->bus_clock);
355
356 seq_printf(m, "\n");
357
358 return 0;
359 }
360
c_start(struct seq_file * m,loff_t * pos)361 static void *c_start(struct seq_file *m, loff_t *pos)
362 {
363 return *pos < NR_CPUS ? cpu_data + *pos : NULL;
364 }
365
c_next(struct seq_file * m,void * v,loff_t * pos)366 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
367 {
368 ++*pos;
369 return c_start(m, pos);
370 }
371
c_stop(struct seq_file * m,void * v)372 static void c_stop(struct seq_file *m, void *v)
373 {
374 }
375
376 const struct seq_operations cpuinfo_op = {
377 .start = c_start,
378 .next = c_next,
379 .stop = c_stop,
380 .show = show_cpuinfo,
381 };
382 #endif /* CONFIG_PROC_FS */
383
384 unsigned long cpu_initialized __initdata = 0;
385
386 /*
387 * cpu_init() initializes state that is per-CPU. Some data is already
388 * initialized (naturally) in the bootstrap process.
389 * We reload them nevertheless, this function acts as a
390 * 'CPU state barrier', nothing should get across.
391 */
392 #if defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_XNUX2) \
393 || defined(CONFIG_CHIP_M32700) || defined(CONFIG_CHIP_M32102) \
394 || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104)
cpu_init(void)395 void __init cpu_init (void)
396 {
397 int cpu_id = smp_processor_id();
398
399 if (test_and_set_bit(cpu_id, &cpu_initialized)) {
400 printk(KERN_WARNING "CPU#%d already initialized!\n", cpu_id);
401 for ( ; ; )
402 local_irq_enable();
403 }
404 printk(KERN_INFO "Initializing CPU#%d\n", cpu_id);
405
406 /* Set up and load the per-CPU TSS and LDT */
407 mmgrab(&init_mm);
408 current->active_mm = &init_mm;
409 if (current->mm)
410 BUG();
411
412 /* Force FPU initialization */
413 current_thread_info()->status = 0;
414 clear_used_math();
415
416 #ifdef CONFIG_MMU
417 /* Set up MMU */
418 init_mmu();
419 #endif
420
421 /* Set up ICUIMASK */
422 outl(0x00070000, M32R_ICU_IMASK_PORTL); /* imask=111 */
423 }
424 #endif /* defined(CONFIG_CHIP_VDEC2) ... */
425