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
38extern void init_mmu(void);
39#endif
40
41extern char _end[];
42
43/*
44 * Machine setup..
45 */
46struct cpuinfo_m32r boot_cpu_data;
47
48#ifdef CONFIG_BLK_DEV_RAM
49extern int rd_doload;	/* 1 = load ramdisk, 0 = don't load */
50extern int rd_prompt;	/* 1 = prompt for ramdisk, 0 = don't prompt */
51extern int rd_image_start;	/* starting block # of image */
52#endif
53
54#if defined(CONFIG_VGA_CONSOLE)
55struct 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
65extern int root_mountflags;
66
67static char __initdata command_line[COMMAND_LINE_SIZE];
68
69static struct resource data_resource = {
70	.name   = "Kernel data",
71	.start  = 0,
72	.end    = 0,
73	.flags  = IORESOURCE_BUSY | IORESOURCE_MEM
74};
75
76static struct resource code_resource = {
77	.name   = "Kernel code",
78	.start  = 0,
79	.end    = 0,
80	.flags  = IORESOURCE_BUSY | IORESOURCE_MEM
81};
82
83unsigned long memory_start;
84unsigned long memory_end;
85
86void __init setup_arch(char **);
87int get_cpuinfo(char *);
88
89static __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
133static 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 */
220extern unsigned long setup_memory(void);
221#endif	/* CONFIG_DISCONTIGMEM */
222
223void __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
271static struct cpu cpu_devices[NR_CPUS];
272
273static 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
283subsys_initcall(topology_init);
284
285#ifdef CONFIG_PROC_FS
286/*
287 *	Get CPU information for use by the procfs.
288 */
289static 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
357static void *c_start(struct seq_file *m, loff_t *pos)
358{
359	return *pos < NR_CPUS ? cpu_data + *pos : NULL;
360}
361
362static void *c_next(struct seq_file *m, void *v, loff_t *pos)
363{
364	++*pos;
365	return c_start(m, pos);
366}
367
368static void c_stop(struct seq_file *m, void *v)
369{
370}
371
372const 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
380unsigned 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)
391void __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