1 /*
2 * arch/sh/kernel/setup.c
3 *
4 * This file handles the architecture-dependent parts of initialization
5 *
6 * Copyright (C) 1999 Niibe Yutaka
7 * Copyright (C) 2002 - 2010 Paul Mundt
8 */
9 #include <linux/screen_info.h>
10 #include <linux/ioport.h>
11 #include <linux/init.h>
12 #include <linux/initrd.h>
13 #include <linux/bootmem.h>
14 #include <linux/console.h>
15 #include <linux/root_dev.h>
16 #include <linux/utsname.h>
17 #include <linux/nodemask.h>
18 #include <linux/cpu.h>
19 #include <linux/pfn.h>
20 #include <linux/fs.h>
21 #include <linux/mm.h>
22 #include <linux/kexec.h>
23 #include <linux/module.h>
24 #include <linux/smp.h>
25 #include <linux/err.h>
26 #include <linux/crash_dump.h>
27 #include <linux/mmzone.h>
28 #include <linux/clk.h>
29 #include <linux/delay.h>
30 #include <linux/platform_device.h>
31 #include <linux/memblock.h>
32 #include <asm/uaccess.h>
33 #include <asm/io.h>
34 #include <asm/page.h>
35 #include <asm/elf.h>
36 #include <asm/sections.h>
37 #include <asm/irq.h>
38 #include <asm/setup.h>
39 #include <asm/clock.h>
40 #include <asm/smp.h>
41 #include <asm/mmu_context.h>
42 #include <asm/mmzone.h>
43 #include <asm/sparsemem.h>
44
45 /*
46 * Initialize loops_per_jiffy as 10000000 (1000MIPS).
47 * This value will be used at the very early stage of serial setup.
48 * The bigger value means no problem.
49 */
50 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
51 [0] = {
52 .type = CPU_SH_NONE,
53 .family = CPU_FAMILY_UNKNOWN,
54 .loops_per_jiffy = 10000000,
55 .phys_bits = MAX_PHYSMEM_BITS,
56 },
57 };
58 EXPORT_SYMBOL(cpu_data);
59
60 /*
61 * The machine vector. First entry in .machvec.init, or clobbered by
62 * sh_mv= on the command line, prior to .machvec.init teardown.
63 */
64 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
65 EXPORT_SYMBOL(sh_mv);
66
67 #ifdef CONFIG_VT
68 struct screen_info screen_info;
69 #endif
70
71 extern int root_mountflags;
72
73 #define RAMDISK_IMAGE_START_MASK 0x07FF
74 #define RAMDISK_PROMPT_FLAG 0x8000
75 #define RAMDISK_LOAD_FLAG 0x4000
76
77 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
78
79 static struct resource code_resource = {
80 .name = "Kernel code",
81 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
82 };
83
84 static struct resource data_resource = {
85 .name = "Kernel data",
86 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
87 };
88
89 static struct resource bss_resource = {
90 .name = "Kernel bss",
91 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
92 };
93
94 unsigned long memory_start;
95 EXPORT_SYMBOL(memory_start);
96 unsigned long memory_end = 0;
97 EXPORT_SYMBOL(memory_end);
98 unsigned long memory_limit = 0;
99
100 static struct resource mem_resources[MAX_NUMNODES];
101
102 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
103
early_parse_mem(char * p)104 static int __init early_parse_mem(char *p)
105 {
106 if (!p)
107 return 1;
108
109 memory_limit = PAGE_ALIGN(memparse(p, &p));
110
111 pr_notice("Memory limited to %ldMB\n", memory_limit >> 20);
112
113 return 0;
114 }
115 early_param("mem", early_parse_mem);
116
check_for_initrd(void)117 void __init check_for_initrd(void)
118 {
119 #ifdef CONFIG_BLK_DEV_INITRD
120 unsigned long start, end;
121
122 /*
123 * Check for the rare cases where boot loaders adhere to the boot
124 * ABI.
125 */
126 if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE)
127 goto disable;
128
129 start = INITRD_START + __MEMORY_START;
130 end = start + INITRD_SIZE;
131
132 if (unlikely(end <= start))
133 goto disable;
134 if (unlikely(start & ~PAGE_MASK)) {
135 pr_err("initrd must be page aligned\n");
136 goto disable;
137 }
138
139 if (unlikely(start < __MEMORY_START)) {
140 pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n",
141 start, __MEMORY_START);
142 goto disable;
143 }
144
145 if (unlikely(end > memblock_end_of_DRAM())) {
146 pr_err("initrd extends beyond end of memory "
147 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
148 end, (unsigned long)memblock_end_of_DRAM());
149 goto disable;
150 }
151
152 /*
153 * If we got this far in spite of the boot loader's best efforts
154 * to the contrary, assume we actually have a valid initrd and
155 * fix up the root dev.
156 */
157 ROOT_DEV = Root_RAM0;
158
159 /*
160 * Address sanitization
161 */
162 initrd_start = (unsigned long)__va(start);
163 initrd_end = initrd_start + INITRD_SIZE;
164
165 memblock_reserve(__pa(initrd_start), INITRD_SIZE);
166
167 return;
168
169 disable:
170 pr_info("initrd disabled\n");
171 initrd_start = initrd_end = 0;
172 #endif
173 }
174
calibrate_delay(void)175 void calibrate_delay(void)
176 {
177 struct clk *clk = clk_get(NULL, "cpu_clk");
178
179 if (IS_ERR(clk))
180 panic("Need a sane CPU clock definition!");
181
182 loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
183
184 printk(KERN_INFO "Calibrating delay loop (skipped)... "
185 "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
186 loops_per_jiffy/(500000/HZ),
187 (loops_per_jiffy/(5000/HZ)) % 100,
188 loops_per_jiffy);
189 }
190
__add_active_range(unsigned int nid,unsigned long start_pfn,unsigned long end_pfn)191 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
192 unsigned long end_pfn)
193 {
194 struct resource *res = &mem_resources[nid];
195 unsigned long start, end;
196
197 WARN_ON(res->name); /* max one active range per node for now */
198
199 start = start_pfn << PAGE_SHIFT;
200 end = end_pfn << PAGE_SHIFT;
201
202 res->name = "System RAM";
203 res->start = start;
204 res->end = end - 1;
205 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
206
207 if (request_resource(&iomem_resource, res)) {
208 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
209 start_pfn, end_pfn);
210 return;
211 }
212
213 /*
214 * We don't know which RAM region contains kernel data or
215 * the reserved crashkernel region, so try it repeatedly
216 * and let the resource manager test it.
217 */
218 request_resource(res, &code_resource);
219 request_resource(res, &data_resource);
220 request_resource(res, &bss_resource);
221 #ifdef CONFIG_KEXEC
222 request_resource(res, &crashk_res);
223 #endif
224
225 /*
226 * Also make sure that there is a PMB mapping that covers this
227 * range before we attempt to activate it, to avoid reset by MMU.
228 * We can hit this path with NUMA or memory hot-add.
229 */
230 pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
231 PAGE_KERNEL);
232
233 memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
234 &memblock.memory, nid);
235 }
236
plat_early_device_setup(void)237 void __init __weak plat_early_device_setup(void)
238 {
239 }
240
setup_arch(char ** cmdline_p)241 void __init setup_arch(char **cmdline_p)
242 {
243 enable_mmu();
244
245 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
246
247 printk(KERN_NOTICE "Boot params:\n"
248 "... MOUNT_ROOT_RDONLY - %08lx\n"
249 "... RAMDISK_FLAGS - %08lx\n"
250 "... ORIG_ROOT_DEV - %08lx\n"
251 "... LOADER_TYPE - %08lx\n"
252 "... INITRD_START - %08lx\n"
253 "... INITRD_SIZE - %08lx\n",
254 MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
255 ORIG_ROOT_DEV, LOADER_TYPE,
256 INITRD_START, INITRD_SIZE);
257
258 #ifdef CONFIG_BLK_DEV_RAM
259 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
260 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
261 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
262 #endif
263
264 if (!MOUNT_ROOT_RDONLY)
265 root_mountflags &= ~MS_RDONLY;
266 init_mm.start_code = (unsigned long) _text;
267 init_mm.end_code = (unsigned long) _etext;
268 init_mm.end_data = (unsigned long) _edata;
269 init_mm.brk = (unsigned long) _end;
270
271 code_resource.start = virt_to_phys(_text);
272 code_resource.end = virt_to_phys(_etext)-1;
273 data_resource.start = virt_to_phys(_etext);
274 data_resource.end = virt_to_phys(_edata)-1;
275 bss_resource.start = virt_to_phys(__bss_start);
276 bss_resource.end = virt_to_phys(__bss_stop)-1;
277
278 #ifdef CONFIG_CMDLINE_OVERWRITE
279 strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
280 #else
281 strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
282 #ifdef CONFIG_CMDLINE_EXTEND
283 strlcat(command_line, " ", sizeof(command_line));
284 strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
285 #endif
286 #endif
287
288 /* Save unparsed command line copy for /proc/cmdline */
289 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
290 *cmdline_p = command_line;
291
292 parse_early_param();
293
294 plat_early_device_setup();
295
296 sh_mv_setup();
297
298 /* Let earlyprintk output early console messages */
299 early_platform_driver_probe("earlyprintk", 1, 1);
300
301 paging_init();
302
303 #ifdef CONFIG_DUMMY_CONSOLE
304 conswitchp = &dummy_con;
305 #endif
306
307 /* Perform the machine specific initialisation */
308 if (likely(sh_mv.mv_setup))
309 sh_mv.mv_setup(cmdline_p);
310
311 plat_smp_setup();
312 }
313
314 /* processor boot mode configuration */
generic_mode_pins(void)315 int generic_mode_pins(void)
316 {
317 pr_warning("generic_mode_pins(): missing mode pin configuration\n");
318 return 0;
319 }
320
test_mode_pin(int pin)321 int test_mode_pin(int pin)
322 {
323 return sh_mv.mv_mode_pins() & pin;
324 }
325