1 /*
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 #include <asm/memblock.h>
41
42 #include "setup.h"
43
44 #ifndef MEM_SIZE
45 #define MEM_SIZE (16*1024*1024)
46 #endif
47
48 struct stack {
49 u32 irq[3];
50 u32 abt[3];
51 u32 und[3];
52 } ____cacheline_aligned;
53
54 static struct stack stacks[NR_CPUS];
55
56 char elf_platform[ELF_PLATFORM_SIZE];
57 EXPORT_SYMBOL(elf_platform);
58
59 static char __initdata cmd_line[COMMAND_LINE_SIZE];
60
61 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
62
63 /*
64 * Standard memory resources
65 */
66 static struct resource mem_res[] = {
67 {
68 .name = "Kernel code",
69 .start = 0,
70 .end = 0,
71 .flags = IORESOURCE_MEM
72 },
73 {
74 .name = "Kernel data",
75 .start = 0,
76 .end = 0,
77 .flags = IORESOURCE_MEM
78 }
79 };
80
81 #define kernel_code mem_res[0]
82 #define kernel_data mem_res[1]
83
84 /*
85 * These functions re-use the assembly code in head.S, which
86 * already provide the required functionality.
87 */
setup_processor(void)88 static void __init setup_processor(void)
89 {
90 printk(KERN_DEFAULT "CPU: UniCore-II [%08x] revision %d, cr=%08lx\n",
91 uc32_cpuid, (int)(uc32_cpuid >> 16) & 15, cr_alignment);
92
93 sprintf(init_utsname()->machine, "puv3");
94 sprintf(elf_platform, "ucv2");
95 }
96
97 /*
98 * cpu_init - initialise one CPU.
99 *
100 * cpu_init sets up the per-CPU stacks.
101 */
cpu_init(void)102 void cpu_init(void)
103 {
104 unsigned int cpu = smp_processor_id();
105 struct stack *stk = &stacks[cpu];
106
107 /*
108 * setup stacks for re-entrant exception handlers
109 */
110 __asm__ (
111 "mov.a asr, %1\n\t"
112 "add sp, %0, %2\n\t"
113 "mov.a asr, %3\n\t"
114 "add sp, %0, %4\n\t"
115 "mov.a asr, %5\n\t"
116 "add sp, %0, %6\n\t"
117 "mov.a asr, %7"
118 :
119 : "r" (stk),
120 "r" (PSR_R_BIT | PSR_I_BIT | INTR_MODE),
121 "I" (offsetof(struct stack, irq[0])),
122 "r" (PSR_R_BIT | PSR_I_BIT | ABRT_MODE),
123 "I" (offsetof(struct stack, abt[0])),
124 "r" (PSR_R_BIT | PSR_I_BIT | EXTN_MODE),
125 "I" (offsetof(struct stack, und[0])),
126 "r" (PSR_R_BIT | PSR_I_BIT | PRIV_MODE)
127 : "r30", "cc");
128 }
129
uc32_add_memory(unsigned long start,unsigned long size)130 static int __init uc32_add_memory(unsigned long start, unsigned long size)
131 {
132 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
133
134 if (meminfo.nr_banks >= NR_BANKS) {
135 printk(KERN_CRIT "NR_BANKS too low, "
136 "ignoring memory at %#lx\n", start);
137 return -EINVAL;
138 }
139
140 /*
141 * Ensure that start/size are aligned to a page boundary.
142 * Size is appropriately rounded down, start is rounded up.
143 */
144 size -= start & ~PAGE_MASK;
145
146 bank->start = PAGE_ALIGN(start);
147 bank->size = size & PAGE_MASK;
148
149 /*
150 * Check whether this memory region has non-zero size or
151 * invalid node number.
152 */
153 if (bank->size == 0)
154 return -EINVAL;
155
156 meminfo.nr_banks++;
157 return 0;
158 }
159
160 /*
161 * Pick out the memory size. We look for mem=size@start,
162 * where start and size are "size[KkMm]"
163 */
early_mem(char * p)164 static int __init early_mem(char *p)
165 {
166 static int usermem __initdata = 1;
167 unsigned long size, start;
168 char *endp;
169
170 /*
171 * If the user specifies memory size, we
172 * blow away any automatically generated
173 * size.
174 */
175 if (usermem) {
176 usermem = 0;
177 meminfo.nr_banks = 0;
178 }
179
180 start = PHYS_OFFSET;
181 size = memparse(p, &endp);
182 if (*endp == '@')
183 start = memparse(endp + 1, NULL);
184
185 uc32_add_memory(start, size);
186
187 return 0;
188 }
189 early_param("mem", early_mem);
190
191 static void __init
request_standard_resources(struct meminfo * mi)192 request_standard_resources(struct meminfo *mi)
193 {
194 struct resource *res;
195 int i;
196
197 kernel_code.start = virt_to_phys(_stext);
198 kernel_code.end = virt_to_phys(_etext - 1);
199 kernel_data.start = virt_to_phys(_sdata);
200 kernel_data.end = virt_to_phys(_end - 1);
201
202 for (i = 0; i < mi->nr_banks; i++) {
203 if (mi->bank[i].size == 0)
204 continue;
205
206 res = alloc_bootmem_low(sizeof(*res));
207 res->name = "System RAM";
208 res->start = mi->bank[i].start;
209 res->end = mi->bank[i].start + mi->bank[i].size - 1;
210 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
211
212 request_resource(&iomem_resource, res);
213
214 if (kernel_code.start >= res->start &&
215 kernel_code.end <= res->end)
216 request_resource(res, &kernel_code);
217 if (kernel_data.start >= res->start &&
218 kernel_data.end <= res->end)
219 request_resource(res, &kernel_data);
220 }
221 }
222
223 static void (*init_machine)(void) __initdata;
224
customize_machine(void)225 static int __init customize_machine(void)
226 {
227 /* customizes platform devices, or adds new ones */
228 if (init_machine)
229 init_machine();
230 return 0;
231 }
232 arch_initcall(customize_machine);
233
setup_arch(char ** cmdline_p)234 void __init setup_arch(char **cmdline_p)
235 {
236 char *from = default_command_line;
237
238 setup_processor();
239
240 init_mm.start_code = (unsigned long) _stext;
241 init_mm.end_code = (unsigned long) _etext;
242 init_mm.end_data = (unsigned long) _edata;
243 init_mm.brk = (unsigned long) _end;
244
245 /* parse_early_param needs a boot_command_line */
246 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
247
248 /* populate cmd_line too for later use, preserving boot_command_line */
249 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
250 *cmdline_p = cmd_line;
251
252 parse_early_param();
253
254 uc32_memblock_init(&meminfo);
255
256 paging_init();
257 request_standard_resources(&meminfo);
258
259 cpu_init();
260
261 /*
262 * Set up various architecture-specific pointers
263 */
264 init_machine = puv3_core_init;
265
266 #ifdef CONFIG_VT
267 #if defined(CONFIG_VGA_CONSOLE)
268 conswitchp = &vga_con;
269 #elif defined(CONFIG_DUMMY_CONSOLE)
270 conswitchp = &dummy_con;
271 #endif
272 #endif
273 early_trap_init();
274 }
275
276 static struct cpu cpuinfo_unicore;
277
topology_init(void)278 static int __init topology_init(void)
279 {
280 int i;
281
282 for_each_possible_cpu(i)
283 register_cpu(&cpuinfo_unicore, i);
284
285 return 0;
286 }
287 subsys_initcall(topology_init);
288
289 #ifdef CONFIG_HAVE_PROC_CPU
proc_cpu_init(void)290 static int __init proc_cpu_init(void)
291 {
292 struct proc_dir_entry *res;
293
294 res = proc_mkdir("cpu", NULL);
295 if (!res)
296 return -ENOMEM;
297 return 0;
298 }
299 fs_initcall(proc_cpu_init);
300 #endif
301
c_show(struct seq_file * m,void * v)302 static int c_show(struct seq_file *m, void *v)
303 {
304 seq_printf(m, "Processor\t: UniCore-II rev %d (%s)\n",
305 (int)(uc32_cpuid >> 16) & 15, elf_platform);
306
307 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
308 loops_per_jiffy / (500000/HZ),
309 (loops_per_jiffy / (5000/HZ)) % 100);
310
311 /* dump out the processor features */
312 seq_puts(m, "Features\t: CMOV UC-F64");
313
314 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", uc32_cpuid >> 24);
315 seq_printf(m, "CPU architecture: 2\n");
316 seq_printf(m, "CPU revision\t: %d\n", (uc32_cpuid >> 16) & 15);
317
318 seq_printf(m, "Cache type\t: write-back\n"
319 "Cache clean\t: cp0 c5 ops\n"
320 "Cache lockdown\t: not support\n"
321 "Cache format\t: Harvard\n");
322
323 seq_puts(m, "\n");
324
325 seq_printf(m, "Hardware\t: PKUnity v3\n");
326
327 return 0;
328 }
329
c_start(struct seq_file * m,loff_t * pos)330 static void *c_start(struct seq_file *m, loff_t *pos)
331 {
332 return *pos < 1 ? (void *)1 : NULL;
333 }
334
c_next(struct seq_file * m,void * v,loff_t * pos)335 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
336 {
337 ++*pos;
338 return NULL;
339 }
340
c_stop(struct seq_file * m,void * v)341 static void c_stop(struct seq_file *m, void *v)
342 {
343 }
344
345 const struct seq_operations cpuinfo_op = {
346 .start = c_start,
347 .next = c_next,
348 .stop = c_stop,
349 .show = c_show
350 };
351