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GuanXuetao141c9432011-01-15 18:15:45 +08001/*
2 * linux/arch/unicore32/kernel/setup.c
3 *
4 * Code specific to PKUnity SoC and UniCore ISA
5 *
6 * Copyright (C) 2001-2010 GUAN Xue-tao
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/stddef.h>
15#include <linux/ioport.h>
16#include <linux/delay.h>
17#include <linux/utsname.h>
18#include <linux/initrd.h>
19#include <linux/console.h>
20#include <linux/bootmem.h>
21#include <linux/seq_file.h>
22#include <linux/screen_info.h>
23#include <linux/init.h>
24#include <linux/root_dev.h>
25#include <linux/cpu.h>
26#include <linux/interrupt.h>
27#include <linux/smp.h>
28#include <linux/fs.h>
29#include <linux/proc_fs.h>
30#include <linux/memblock.h>
31#include <linux/elf.h>
32#include <linux/io.h>
33
34#include <asm/cputype.h>
35#include <asm/sections.h>
36#include <asm/setup.h>
37#include <asm/cacheflush.h>
38#include <asm/tlbflush.h>
39#include <asm/traps.h>
40
41#include "setup.h"
42
43#ifndef MEM_SIZE
44#define MEM_SIZE (16*1024*1024)
45#endif
46
47struct stack {
48 u32 irq[3];
49 u32 abt[3];
50 u32 und[3];
51} ____cacheline_aligned;
52
53static struct stack stacks[NR_CPUS];
54
55char elf_platform[ELF_PLATFORM_SIZE];
56EXPORT_SYMBOL(elf_platform);
57
58static char __initdata cmd_line[COMMAND_LINE_SIZE];
59
60static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
61
62/*
63 * Standard memory resources
64 */
65static struct resource mem_res[] = {
66 {
GuanXuetao141c9432011-01-15 18:15:45 +080067 .name = "Kernel text",
68 .start = 0,
69 .end = 0,
70 .flags = IORESOURCE_MEM
71 },
72 {
73 .name = "Kernel data",
74 .start = 0,
75 .end = 0,
76 .flags = IORESOURCE_MEM
77 }
78};
79
Guan Xuetao6b794742011-04-01 16:38:59 +080080#define kernel_code mem_res[0]
81#define kernel_data mem_res[1]
GuanXuetao141c9432011-01-15 18:15:45 +080082
83/*
84 * These functions re-use the assembly code in head.S, which
85 * already provide the required functionality.
86 */
87static void __init setup_processor(void)
88{
89 printk(KERN_DEFAULT "CPU: UniCore-II [%08x] revision %d, cr=%08lx\n",
90 uc32_cpuid, (int)(uc32_cpuid >> 16) & 15, cr_alignment);
91
92 sprintf(init_utsname()->machine, "puv3");
93 sprintf(elf_platform, "ucv2");
94}
95
96/*
97 * cpu_init - initialise one CPU.
98 *
99 * cpu_init sets up the per-CPU stacks.
100 */
101void cpu_init(void)
102{
103 unsigned int cpu = smp_processor_id();
104 struct stack *stk = &stacks[cpu];
105
106 /*
107 * setup stacks for re-entrant exception handlers
108 */
109 __asm__ (
110 "mov.a asr, %1\n\t"
111 "add sp, %0, %2\n\t"
112 "mov.a asr, %3\n\t"
113 "add sp, %0, %4\n\t"
114 "mov.a asr, %5\n\t"
115 "add sp, %0, %6\n\t"
116 "mov.a asr, %7"
117 :
118 : "r" (stk),
119 "r" (PSR_R_BIT | PSR_I_BIT | INTR_MODE),
120 "I" (offsetof(struct stack, irq[0])),
121 "r" (PSR_R_BIT | PSR_I_BIT | ABRT_MODE),
122 "I" (offsetof(struct stack, abt[0])),
123 "r" (PSR_R_BIT | PSR_I_BIT | EXTN_MODE),
124 "I" (offsetof(struct stack, und[0])),
125 "r" (PSR_R_BIT | PSR_I_BIT | PRIV_MODE)
126 : "r30", "cc");
127}
128
129static int __init uc32_add_memory(unsigned long start, unsigned long size)
130{
131 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
132
133 if (meminfo.nr_banks >= NR_BANKS) {
134 printk(KERN_CRIT "NR_BANKS too low, "
135 "ignoring memory at %#lx\n", start);
136 return -EINVAL;
137 }
138
139 /*
140 * Ensure that start/size are aligned to a page boundary.
141 * Size is appropriately rounded down, start is rounded up.
142 */
143 size -= start & ~PAGE_MASK;
144
145 bank->start = PAGE_ALIGN(start);
146 bank->size = size & PAGE_MASK;
147
148 /*
149 * Check whether this memory region has non-zero size or
150 * invalid node number.
151 */
152 if (bank->size == 0)
153 return -EINVAL;
154
155 meminfo.nr_banks++;
156 return 0;
157}
158
159/*
160 * Pick out the memory size. We look for mem=size@start,
161 * where start and size are "size[KkMm]"
162 */
163static int __init early_mem(char *p)
164{
165 static int usermem __initdata = 1;
166 unsigned long size, start;
167 char *endp;
168
169 /*
170 * If the user specifies memory size, we
171 * blow away any automatically generated
172 * size.
173 */
174 if (usermem) {
175 usermem = 0;
176 meminfo.nr_banks = 0;
177 }
178
179 start = PHYS_OFFSET;
180 size = memparse(p, &endp);
181 if (*endp == '@')
182 start = memparse(endp + 1, NULL);
183
184 uc32_add_memory(start, size);
185
186 return 0;
187}
188early_param("mem", early_mem);
189
190static void __init
191request_standard_resources(struct meminfo *mi)
192{
193 struct resource *res;
194 int i;
195
196 kernel_code.start = virt_to_phys(_stext);
197 kernel_code.end = virt_to_phys(_etext - 1);
198 kernel_data.start = virt_to_phys(_sdata);
199 kernel_data.end = virt_to_phys(_end - 1);
200
201 for (i = 0; i < mi->nr_banks; i++) {
202 if (mi->bank[i].size == 0)
203 continue;
204
205 res = alloc_bootmem_low(sizeof(*res));
206 res->name = "System RAM";
207 res->start = mi->bank[i].start;
208 res->end = mi->bank[i].start + mi->bank[i].size - 1;
209 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
210
211 request_resource(&iomem_resource, res);
212
213 if (kernel_code.start >= res->start &&
214 kernel_code.end <= res->end)
215 request_resource(res, &kernel_code);
216 if (kernel_data.start >= res->start &&
217 kernel_data.end <= res->end)
218 request_resource(res, &kernel_data);
219 }
GuanXuetao141c9432011-01-15 18:15:45 +0800220}
221
222static void (*init_machine)(void) __initdata;
223
224static int __init customize_machine(void)
225{
226 /* customizes platform devices, or adds new ones */
227 if (init_machine)
228 init_machine();
229 return 0;
230}
231arch_initcall(customize_machine);
232
233void __init setup_arch(char **cmdline_p)
234{
235 char *from = default_command_line;
236
237 setup_processor();
238
239 init_mm.start_code = (unsigned long) _stext;
240 init_mm.end_code = (unsigned long) _etext;
241 init_mm.end_data = (unsigned long) _edata;
242 init_mm.brk = (unsigned long) _end;
243
244 /* parse_early_param needs a boot_command_line */
245 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
246
247 /* populate cmd_line too for later use, preserving boot_command_line */
248 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
249 *cmdline_p = cmd_line;
250
251 parse_early_param();
252
253 uc32_memblock_init(&meminfo);
254
255 paging_init();
256 request_standard_resources(&meminfo);
257
258 cpu_init();
259
260 /*
261 * Set up various architecture-specific pointers
262 */
263 init_machine = puv3_core_init;
264
265#ifdef CONFIG_VT
266#if defined(CONFIG_VGA_CONSOLE)
267 conswitchp = &vga_con;
268#elif defined(CONFIG_DUMMY_CONSOLE)
269 conswitchp = &dummy_con;
270#endif
271#endif
272 early_trap_init();
273}
274
275static struct cpu cpuinfo_unicore;
276
277static int __init topology_init(void)
278{
279 int i;
280
281 for_each_possible_cpu(i)
282 register_cpu(&cpuinfo_unicore, i);
283
284 return 0;
285}
286subsys_initcall(topology_init);
287
288#ifdef CONFIG_HAVE_PROC_CPU
289static int __init proc_cpu_init(void)
290{
291 struct proc_dir_entry *res;
292
293 res = proc_mkdir("cpu", NULL);
294 if (!res)
295 return -ENOMEM;
296 return 0;
297}
298fs_initcall(proc_cpu_init);
299#endif
300
301static int c_show(struct seq_file *m, void *v)
302{
303 seq_printf(m, "Processor\t: UniCore-II rev %d (%s)\n",
304 (int)(uc32_cpuid >> 16) & 15, elf_platform);
305
306 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
307 loops_per_jiffy / (500000/HZ),
308 (loops_per_jiffy / (5000/HZ)) % 100);
309
310 /* dump out the processor features */
311 seq_puts(m, "Features\t: CMOV UC-F64");
312
313 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", uc32_cpuid >> 24);
314 seq_printf(m, "CPU architecture: 2\n");
315 seq_printf(m, "CPU revision\t: %d\n", (uc32_cpuid >> 16) & 15);
316
317 seq_printf(m, "Cache type\t: write-back\n"
318 "Cache clean\t: cp0 c5 ops\n"
319 "Cache lockdown\t: not support\n"
320 "Cache format\t: Harvard\n");
321
322 seq_puts(m, "\n");
323
324 seq_printf(m, "Hardware\t: PKUnity v3\n");
325
326 return 0;
327}
328
329static void *c_start(struct seq_file *m, loff_t *pos)
330{
331 return *pos < 1 ? (void *)1 : NULL;
332}
333
334static void *c_next(struct seq_file *m, void *v, loff_t *pos)
335{
336 ++*pos;
337 return NULL;
338}
339
340static void c_stop(struct seq_file *m, void *v)
341{
342}
343
344const struct seq_operations cpuinfo_op = {
345 .start = c_start,
346 .next = c_next,
347 .stop = c_stop,
348 .show = c_show
349};