summaryrefslogtreecommitdiffstats
path: root/arch/unicore32/kernel/setup.c
blob: d3239cf2e83753c4388c150e22bb44521ac60895 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
/*
 * linux/arch/unicore32/kernel/setup.c
 *
 * Code specific to PKUnity SoC and UniCore ISA
 *
 * Copyright (C) 2001-2010 GUAN Xue-tao
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/utsname.h>
#include <linux/initrd.h>
#include <linux/console.h>
#include <linux/memblock.h>
#include <linux/seq_file.h>
#include <linux/screen_info.h>
#include <linux/init.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/elf.h>
#include <linux/io.h>

#include <asm/cputype.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/traps.h>
#include <asm/memblock.h>

#include "setup.h"

#ifndef MEM_SIZE
#define MEM_SIZE	(16*1024*1024)
#endif

struct stack {
	u32 irq[3];
	u32 abt[3];
	u32 und[3];
} ____cacheline_aligned;

static struct stack stacks[NR_CPUS];

#ifdef CONFIG_VGA_CONSOLE
struct screen_info screen_info;
#endif

char elf_platform[ELF_PLATFORM_SIZE];
EXPORT_SYMBOL(elf_platform);

static char __initdata cmd_line[COMMAND_LINE_SIZE];

static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;

/*
 * Standard memory resources
 */
static struct resource mem_res[] = {
	{
		.name = "Kernel code",
		.start = 0,
		.end = 0,
		.flags = IORESOURCE_SYSTEM_RAM
	},
	{
		.name = "Kernel data",
		.start = 0,
		.end = 0,
		.flags = IORESOURCE_SYSTEM_RAM
	}
};

#define kernel_code mem_res[0]
#define kernel_data mem_res[1]

/*
 * These functions re-use the assembly code in head.S, which
 * already provide the required functionality.
 */
static void __init setup_processor(void)
{
	printk(KERN_DEFAULT "CPU: UniCore-II [%08x] revision %d, cr=%08lx\n",
	       uc32_cpuid, (int)(uc32_cpuid >> 16) & 15, cr_alignment);

	sprintf(init_utsname()->machine, "puv3");
	sprintf(elf_platform, "ucv2");
}

/*
 * cpu_init - initialise one CPU.
 *
 * cpu_init sets up the per-CPU stacks.
 */
void cpu_init(void)
{
	unsigned int cpu = smp_processor_id();
	struct stack *stk = &stacks[cpu];

	/*
	 * setup stacks for re-entrant exception handlers
	 */
	__asm__ (
	"mov.a	asr, %1\n\t"
	"add	sp, %0, %2\n\t"
	"mov.a	asr, %3\n\t"
	"add	sp, %0, %4\n\t"
	"mov.a	asr, %5\n\t"
	"add	sp, %0, %6\n\t"
	"mov.a	asr, %7"
	    :
	    : "r" (stk),
	      "r" (PSR_R_BIT | PSR_I_BIT | INTR_MODE),
	      "I" (offsetof(struct stack, irq[0])),
	      "r" (PSR_R_BIT | PSR_I_BIT | ABRT_MODE),
	      "I" (offsetof(struct stack, abt[0])),
	      "r" (PSR_R_BIT | PSR_I_BIT | EXTN_MODE),
	      "I" (offsetof(struct stack, und[0])),
	      "r" (PSR_R_BIT | PSR_I_BIT | PRIV_MODE)
	: "r30", "cc");
}

static int __init uc32_add_memory(unsigned long start, unsigned long size)
{
	struct membank *bank = &meminfo.bank[meminfo.nr_banks];

	if (meminfo.nr_banks >= NR_BANKS) {
		printk(KERN_CRIT "NR_BANKS too low, "
			"ignoring memory at %#lx\n", start);
		return -EINVAL;
	}

	/*
	 * Ensure that start/size are aligned to a page boundary.
	 * Size is appropriately rounded down, start is rounded up.
	 */
	size -= start & ~PAGE_MASK;

	bank->start = PAGE_ALIGN(start);
	bank->size  = size & PAGE_MASK;

	/*
	 * Check whether this memory region has non-zero size or
	 * invalid node number.
	 */
	if (bank->size == 0)
		return -EINVAL;

	meminfo.nr_banks++;
	return 0;
}

/*
 * Pick out the memory size.  We look for mem=size@start,
 * where start and size are "size[KkMm]"
 */
static int __init early_mem(char *p)
{
	static int usermem __initdata = 1;
	unsigned long size, start;
	char *endp;

	/*
	 * If the user specifies memory size, we
	 * blow away any automatically generated
	 * size.
	 */
	if (usermem) {
		usermem = 0;
		meminfo.nr_banks = 0;
	}

	start = PHYS_OFFSET;
	size  = memparse(p, &endp);
	if (*endp == '@')
		start = memparse(endp + 1, NULL);

	uc32_add_memory(start, size);

	return 0;
}
early_param("mem", early_mem);

static void __init
request_standard_resources(struct meminfo *mi)
{
	struct resource *res;
	int i;

	kernel_code.start   = virt_to_phys(_stext);
	kernel_code.end     = virt_to_phys(_etext - 1);
	kernel_data.start   = virt_to_phys(_sdata);
	kernel_data.end     = virt_to_phys(_end - 1);

	for (i = 0; i < mi->nr_banks; i++) {
		if (mi->bank[i].size == 0)
			continue;

		res = memblock_alloc_low(sizeof(*res), SMP_CACHE_BYTES);
		if (!res)
			panic("%s: Failed to allocate %zu bytes align=%x\n",
			      __func__, sizeof(*res), SMP_CACHE_BYTES);

		res->name  = "System RAM";
		res->start = mi->bank[i].start;
		res->end   = mi->bank[i].start + mi->bank[i].size - 1;
		res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;

		request_resource(&iomem_resource, res);

		if (kernel_code.start >= res->start &&
		    kernel_code.end <= res->end)
			request_resource(res, &kernel_code);
		if (kernel_data.start >= res->start &&
		    kernel_data.end <= res->end)
			request_resource(res, &kernel_data);
	}
}

static void (*init_machine)(void) __initdata;

static int __init customize_machine(void)
{
	/* customizes platform devices, or adds new ones */
	if (init_machine)
		init_machine();
	return 0;
}
arch_initcall(customize_machine);

void __init setup_arch(char **cmdline_p)
{
	char *from = default_command_line;

	setup_processor();

	init_mm.start_code = (unsigned long) _stext;
	init_mm.end_code   = (unsigned long) _etext;
	init_mm.end_data   = (unsigned long) _edata;
	init_mm.brk	   = (unsigned long) _end;

	/* parse_early_param needs a boot_command_line */
	strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);

	/* populate cmd_line too for later use, preserving boot_command_line */
	strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
	*cmdline_p = cmd_line;

	parse_early_param();

	uc32_memblock_init(&meminfo);

	paging_init();
	request_standard_resources(&meminfo);

	cpu_init();

	/*
	 * Set up various architecture-specific pointers
	 */
	init_machine = puv3_core_init;

#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
	conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
#endif
#endif
	early_trap_init();
}

static struct cpu cpuinfo_unicore;

static int __init topology_init(void)
{
	int i;

	for_each_possible_cpu(i)
		register_cpu(&cpuinfo_unicore, i);

	return 0;
}
subsys_initcall(topology_init);

#ifdef CONFIG_HAVE_PROC_CPU
static int __init proc_cpu_init(void)
{
	struct proc_dir_entry *res;

	res = proc_mkdir("cpu", NULL);
	if (!res)
		return -ENOMEM;
	return 0;
}
fs_initcall(proc_cpu_init);
#endif

static int c_show(struct seq_file *m, void *v)
{
	seq_printf(m, "Processor\t: UniCore-II rev %d (%s)\n",
		   (int)(uc32_cpuid >> 16) & 15, elf_platform);

	seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
		   loops_per_jiffy / (500000/HZ),
		   (loops_per_jiffy / (5000/HZ)) % 100);

	/* dump out the processor features */
	seq_puts(m, "Features\t: CMOV UC-F64");

	seq_printf(m, "\nCPU implementer\t: 0x%02x\n", uc32_cpuid >> 24);
	seq_printf(m, "CPU architecture: 2\n");
	seq_printf(m, "CPU revision\t: %d\n", (uc32_cpuid >> 16) & 15);

	seq_printf(m, "Cache type\t: write-back\n"
			"Cache clean\t: cp0 c5 ops\n"
			"Cache lockdown\t: not support\n"
			"Cache format\t: Harvard\n");

	seq_puts(m, "\n");

	seq_printf(m, "Hardware\t: PKUnity v3\n");

	return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	return *pos < 1 ? (void *)1 : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return NULL;
}

static void c_stop(struct seq_file *m, void *v)
{
}

const struct seq_operations cpuinfo_op = {
	.start	= c_start,
	.next	= c_next,
	.stop	= c_stop,
	.show	= c_show
};