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Linux/arch/sh/kernel/setup.c

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  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 <linux/of.h>
 33 #include <linux/of_fdt.h>
 34 #include <asm/uaccess.h>
 35 #include <asm/io.h>
 36 #include <asm/page.h>
 37 #include <asm/elf.h>
 38 #include <asm/sections.h>
 39 #include <asm/irq.h>
 40 #include <asm/setup.h>
 41 #include <asm/clock.h>
 42 #include <asm/smp.h>
 43 #include <asm/mmu_context.h>
 44 #include <asm/mmzone.h>
 45 #include <asm/sparsemem.h>
 46 
 47 /*
 48  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
 49  * This value will be used at the very early stage of serial setup.
 50  * The bigger value means no problem.
 51  */
 52 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
 53         [0] = {
 54                 .type                   = CPU_SH_NONE,
 55                 .family                 = CPU_FAMILY_UNKNOWN,
 56                 .loops_per_jiffy        = 10000000,
 57                 .phys_bits              = MAX_PHYSMEM_BITS,
 58         },
 59 };
 60 EXPORT_SYMBOL(cpu_data);
 61 
 62 /*
 63  * The machine vector. First entry in .machvec.init, or clobbered by
 64  * sh_mv= on the command line, prior to .machvec.init teardown.
 65  */
 66 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
 67 EXPORT_SYMBOL(sh_mv);
 68 
 69 #ifdef CONFIG_VT
 70 struct screen_info screen_info;
 71 #endif
 72 
 73 extern int root_mountflags;
 74 
 75 #define RAMDISK_IMAGE_START_MASK        0x07FF
 76 #define RAMDISK_PROMPT_FLAG             0x8000
 77 #define RAMDISK_LOAD_FLAG               0x4000
 78 
 79 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
 80 
 81 static struct resource code_resource = {
 82         .name = "Kernel code",
 83         .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 84 };
 85 
 86 static struct resource data_resource = {
 87         .name = "Kernel data",
 88         .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 89 };
 90 
 91 static struct resource bss_resource = {
 92         .name   = "Kernel bss",
 93         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 94 };
 95 
 96 unsigned long memory_start;
 97 EXPORT_SYMBOL(memory_start);
 98 unsigned long memory_end = 0;
 99 EXPORT_SYMBOL(memory_end);
100 unsigned long memory_limit = 0;
101 
102 static struct resource mem_resources[MAX_NUMNODES];
103 
104 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
105 
106 static int __init early_parse_mem(char *p)
107 {
108         if (!p)
109                 return 1;
110 
111         memory_limit = PAGE_ALIGN(memparse(p, &p));
112 
113         pr_notice("Memory limited to %ldMB\n", memory_limit >> 20);
114 
115         return 0;
116 }
117 early_param("mem", early_parse_mem);
118 
119 void __init check_for_initrd(void)
120 {
121 #ifdef CONFIG_BLK_DEV_INITRD
122         unsigned long start, end;
123 
124         /*
125          * Check for the rare cases where boot loaders adhere to the boot
126          * ABI.
127          */
128         if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE)
129                 goto disable;
130 
131         start = INITRD_START + __MEMORY_START;
132         end = start + INITRD_SIZE;
133 
134         if (unlikely(end <= start))
135                 goto disable;
136         if (unlikely(start & ~PAGE_MASK)) {
137                 pr_err("initrd must be page aligned\n");
138                 goto disable;
139         }
140 
141         if (unlikely(start < __MEMORY_START)) {
142                 pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n",
143                         start, __MEMORY_START);
144                 goto disable;
145         }
146 
147         if (unlikely(end > memblock_end_of_DRAM())) {
148                 pr_err("initrd extends beyond end of memory "
149                        "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
150                        end, (unsigned long)memblock_end_of_DRAM());
151                 goto disable;
152         }
153 
154         /*
155          * If we got this far in spite of the boot loader's best efforts
156          * to the contrary, assume we actually have a valid initrd and
157          * fix up the root dev.
158          */
159         ROOT_DEV = Root_RAM0;
160 
161         /*
162          * Address sanitization
163          */
164         initrd_start = (unsigned long)__va(start);
165         initrd_end = initrd_start + INITRD_SIZE;
166 
167         memblock_reserve(__pa(initrd_start), INITRD_SIZE);
168 
169         return;
170 
171 disable:
172         pr_info("initrd disabled\n");
173         initrd_start = initrd_end = 0;
174 #endif
175 }
176 
177 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY
178 void calibrate_delay(void)
179 {
180         struct clk *clk = clk_get(NULL, "cpu_clk");
181 
182         if (IS_ERR(clk))
183                 panic("Need a sane CPU clock definition!");
184 
185         loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
186 
187         printk(KERN_INFO "Calibrating delay loop (skipped)... "
188                          "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
189                          loops_per_jiffy/(500000/HZ),
190                          (loops_per_jiffy/(5000/HZ)) % 100,
191                          loops_per_jiffy);
192 }
193 #endif
194 
195 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
196                                                 unsigned long end_pfn)
197 {
198         struct resource *res = &mem_resources[nid];
199         unsigned long start, end;
200 
201         WARN_ON(res->name); /* max one active range per node for now */
202 
203         start = start_pfn << PAGE_SHIFT;
204         end = end_pfn << PAGE_SHIFT;
205 
206         res->name = "System RAM";
207         res->start = start;
208         res->end = end - 1;
209         res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
210 
211         if (request_resource(&iomem_resource, res)) {
212                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
213                        start_pfn, end_pfn);
214                 return;
215         }
216 
217         /*
218          * We don't know which RAM region contains kernel data or
219          * the reserved crashkernel region, so try it repeatedly
220          * and let the resource manager test it.
221          */
222         request_resource(res, &code_resource);
223         request_resource(res, &data_resource);
224         request_resource(res, &bss_resource);
225 #ifdef CONFIG_KEXEC
226         request_resource(res, &crashk_res);
227 #endif
228 
229         /*
230          * Also make sure that there is a PMB mapping that covers this
231          * range before we attempt to activate it, to avoid reset by MMU.
232          * We can hit this path with NUMA or memory hot-add.
233          */
234         pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
235                          PAGE_KERNEL);
236 
237         memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
238                           &memblock.memory, nid);
239 }
240 
241 void __init __weak plat_early_device_setup(void)
242 {
243 }
244 
245 #ifdef CONFIG_OF
246 void __ref sh_fdt_init(phys_addr_t dt_phys)
247 {
248         static int done = 0;
249         void *dt_virt;
250 
251         /* Avoid calling an __init function on secondary cpus. */
252         if (done) return;
253 
254         dt_virt = phys_to_virt(dt_phys);
255 
256         if (!dt_virt || !early_init_dt_scan(dt_virt)) {
257                 pr_crit("Error: invalid device tree blob"
258                         " at physical address %p\n", (void *)dt_phys);
259 
260                 while (true)
261                         cpu_relax();
262         }
263 
264         done = 1;
265 }
266 #endif
267 
268 void __init setup_arch(char **cmdline_p)
269 {
270         enable_mmu();
271 
272         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
273 
274         printk(KERN_NOTICE "Boot params:\n"
275                            "... MOUNT_ROOT_RDONLY - %08lx\n"
276                            "... RAMDISK_FLAGS     - %08lx\n"
277                            "... ORIG_ROOT_DEV     - %08lx\n"
278                            "... LOADER_TYPE       - %08lx\n"
279                            "... INITRD_START      - %08lx\n"
280                            "... INITRD_SIZE       - %08lx\n",
281                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
282                            ORIG_ROOT_DEV, LOADER_TYPE,
283                            INITRD_START, INITRD_SIZE);
284 
285 #ifdef CONFIG_BLK_DEV_RAM
286         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
287         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
288         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
289 #endif
290 
291         if (!MOUNT_ROOT_RDONLY)
292                 root_mountflags &= ~MS_RDONLY;
293         init_mm.start_code = (unsigned long) _text;
294         init_mm.end_code = (unsigned long) _etext;
295         init_mm.end_data = (unsigned long) _edata;
296         init_mm.brk = (unsigned long) _end;
297 
298         code_resource.start = virt_to_phys(_text);
299         code_resource.end = virt_to_phys(_etext)-1;
300         data_resource.start = virt_to_phys(_etext);
301         data_resource.end = virt_to_phys(_edata)-1;
302         bss_resource.start = virt_to_phys(__bss_start);
303         bss_resource.end = virt_to_phys(__bss_stop)-1;
304 
305 #ifdef CONFIG_CMDLINE_OVERWRITE
306         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
307 #else
308         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
309 #ifdef CONFIG_CMDLINE_EXTEND
310         strlcat(command_line, " ", sizeof(command_line));
311         strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
312 #endif
313 #endif
314 
315         /* Save unparsed command line copy for /proc/cmdline */
316         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
317         *cmdline_p = command_line;
318 
319         parse_early_param();
320 
321         plat_early_device_setup();
322 
323         sh_mv_setup();
324 
325         /* Let earlyprintk output early console messages */
326         early_platform_driver_probe("earlyprintk", 1, 1);
327 
328         paging_init();
329 
330 #ifdef CONFIG_DUMMY_CONSOLE
331         conswitchp = &dummy_con;
332 #endif
333 
334         /* Perform the machine specific initialisation */
335         if (likely(sh_mv.mv_setup))
336                 sh_mv.mv_setup(cmdline_p);
337 
338         plat_smp_setup();
339 }
340 
341 /* processor boot mode configuration */
342 int generic_mode_pins(void)
343 {
344         pr_warning("generic_mode_pins(): missing mode pin configuration\n");
345         return 0;
346 }
347 
348 int test_mode_pin(int pin)
349 {
350         return sh_mv.mv_mode_pins() & pin;
351 }
352 

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