2 * linux/arch/unicore32/kernel/setup.c
4 * Code specific to PKUnity SoC and UniCore ISA
6 * Copyright (C) 2001-2010 GUAN Xue-tao
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.
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>
29 #include <linux/proc_fs.h>
30 #include <linux/memblock.h>
31 #include <linux/elf.h>
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>
44 #define MEM_SIZE (16*1024*1024)
51 } ____cacheline_aligned;
53 static struct stack stacks[NR_CPUS];
55 char elf_platform[ELF_PLATFORM_SIZE];
56 EXPORT_SYMBOL(elf_platform);
58 static char __initdata cmd_line[COMMAND_LINE_SIZE];
60 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
63 * Standard memory resources
65 static struct resource mem_res[] = {
67 .name = "Kernel text",
70 .flags = IORESOURCE_MEM
73 .name = "Kernel data",
76 .flags = IORESOURCE_MEM
80 #define kernel_code mem_res[0]
81 #define kernel_data mem_res[1]
84 * These functions re-use the assembly code in head.S, which
85 * already provide the required functionality.
87 static void __init setup_processor(void)
89 printk(KERN_DEFAULT "CPU: UniCore-II [%08x] revision %d, cr=%08lx\n",
90 uc32_cpuid, (int)(uc32_cpuid >> 16) & 15, cr_alignment);
92 sprintf(init_utsname()->machine, "puv3");
93 sprintf(elf_platform, "ucv2");
97 * cpu_init - initialise one CPU.
99 * cpu_init sets up the per-CPU stacks.
103 unsigned int cpu = smp_processor_id();
104 struct stack *stk = &stacks[cpu];
107 * setup stacks for re-entrant exception handlers
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)
129 static int __init uc32_add_memory(unsigned long start, unsigned long size)
131 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
133 if (meminfo.nr_banks >= NR_BANKS) {
134 printk(KERN_CRIT "NR_BANKS too low, "
135 "ignoring memory at %#lx\n", start);
140 * Ensure that start/size are aligned to a page boundary.
141 * Size is appropriately rounded down, start is rounded up.
143 size -= start & ~PAGE_MASK;
145 bank->start = PAGE_ALIGN(start);
146 bank->size = size & PAGE_MASK;
149 * Check whether this memory region has non-zero size or
150 * invalid node number.
160 * Pick out the memory size. We look for mem=size@start,
161 * where start and size are "size[KkMm]"
163 static int __init early_mem(char *p)
165 static int usermem __initdata = 1;
166 unsigned long size, start;
170 * If the user specifies memory size, we
171 * blow away any automatically generated
176 meminfo.nr_banks = 0;
180 size = memparse(p, &endp);
182 start = memparse(endp + 1, NULL);
184 uc32_add_memory(start, size);
188 early_param("mem", early_mem);
191 request_standard_resources(struct meminfo *mi)
193 struct resource *res;
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);
201 for (i = 0; i < mi->nr_banks; i++) {
202 if (mi->bank[i].size == 0)
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;
211 request_resource(&iomem_resource, res);
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);
222 static void (*init_machine)(void) __initdata;
224 static int __init customize_machine(void)
226 /* customizes platform devices, or adds new ones */
231 arch_initcall(customize_machine);
233 void __init setup_arch(char **cmdline_p)
235 char *from = default_command_line;
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;
244 /* parse_early_param needs a boot_command_line */
245 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
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;
253 uc32_memblock_init(&meminfo);
256 request_standard_resources(&meminfo);
261 * Set up various architecture-specific pointers
263 init_machine = puv3_core_init;
266 #if defined(CONFIG_VGA_CONSOLE)
267 conswitchp = &vga_con;
268 #elif defined(CONFIG_DUMMY_CONSOLE)
269 conswitchp = &dummy_con;
275 static struct cpu cpuinfo_unicore;
277 static int __init topology_init(void)
281 for_each_possible_cpu(i)
282 register_cpu(&cpuinfo_unicore, i);
286 subsys_initcall(topology_init);
288 #ifdef CONFIG_HAVE_PROC_CPU
289 static int __init proc_cpu_init(void)
291 struct proc_dir_entry *res;
293 res = proc_mkdir("cpu", NULL);
298 fs_initcall(proc_cpu_init);
301 static int c_show(struct seq_file *m, void *v)
303 seq_printf(m, "Processor\t: UniCore-II rev %d (%s)\n",
304 (int)(uc32_cpuid >> 16) & 15, elf_platform);
306 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
307 loops_per_jiffy / (500000/HZ),
308 (loops_per_jiffy / (5000/HZ)) % 100);
310 /* dump out the processor features */
311 seq_puts(m, "Features\t: CMOV UC-F64");
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);
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");
324 seq_printf(m, "Hardware\t: PKUnity v3\n");
329 static void *c_start(struct seq_file *m, loff_t *pos)
331 return *pos < 1 ? (void *)1 : NULL;
334 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
340 static void c_stop(struct seq_file *m, void *v)
344 const struct seq_operations cpuinfo_op = {