Merge branches 'sh/core', 'sh/io-overhaul' and 'sh/urgent' into sh-latest
[~shefty/rdma-dev.git] / arch / sh / kernel / setup.c
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
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
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 inspite 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
175 void __cpuinit 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
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,
215          *  so we try it repeatedly and let the resource manager
216          *  test it.
217          */
218         request_resource(res, &code_resource);
219         request_resource(res, &data_resource);
220         request_resource(res, &bss_resource);
221
222         /*
223          * Also make sure that there is a PMB mapping that covers this
224          * range before we attempt to activate it, to avoid reset by MMU.
225          * We can hit this path with NUMA or memory hot-add.
226          */
227         pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
228                          PAGE_KERNEL);
229
230         add_active_range(nid, start_pfn, end_pfn);
231 }
232
233 void __init __weak plat_early_device_setup(void)
234 {
235 }
236
237 void __init setup_arch(char **cmdline_p)
238 {
239         enable_mmu();
240
241         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
242
243         printk(KERN_NOTICE "Boot params:\n"
244                            "... MOUNT_ROOT_RDONLY - %08lx\n"
245                            "... RAMDISK_FLAGS     - %08lx\n"
246                            "... ORIG_ROOT_DEV     - %08lx\n"
247                            "... LOADER_TYPE       - %08lx\n"
248                            "... INITRD_START      - %08lx\n"
249                            "... INITRD_SIZE       - %08lx\n",
250                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
251                            ORIG_ROOT_DEV, LOADER_TYPE,
252                            INITRD_START, INITRD_SIZE);
253
254 #ifdef CONFIG_BLK_DEV_RAM
255         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
256         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
257         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
258 #endif
259
260         if (!MOUNT_ROOT_RDONLY)
261                 root_mountflags &= ~MS_RDONLY;
262         init_mm.start_code = (unsigned long) _text;
263         init_mm.end_code = (unsigned long) _etext;
264         init_mm.end_data = (unsigned long) _edata;
265         init_mm.brk = (unsigned long) _end;
266
267         code_resource.start = virt_to_phys(_text);
268         code_resource.end = virt_to_phys(_etext)-1;
269         data_resource.start = virt_to_phys(_etext);
270         data_resource.end = virt_to_phys(_edata)-1;
271         bss_resource.start = virt_to_phys(__bss_start);
272         bss_resource.end = virt_to_phys(_ebss)-1;
273
274 #ifdef CONFIG_CMDLINE_OVERWRITE
275         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
276 #else
277         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
278 #ifdef CONFIG_CMDLINE_EXTEND
279         strlcat(command_line, " ", sizeof(command_line));
280         strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
281 #endif
282 #endif
283
284         /* Save unparsed command line copy for /proc/cmdline */
285         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
286         *cmdline_p = command_line;
287
288         parse_early_param();
289
290         plat_early_device_setup();
291
292         sh_mv_setup();
293
294         /* Let earlyprintk output early console messages */
295         early_platform_driver_probe("earlyprintk", 1, 1);
296
297         paging_init();
298
299 #ifdef CONFIG_DUMMY_CONSOLE
300         conswitchp = &dummy_con;
301 #endif
302
303         /* Perform the machine specific initialisation */
304         if (likely(sh_mv.mv_setup))
305                 sh_mv.mv_setup(cmdline_p);
306
307         plat_smp_setup();
308 }
309
310 /* processor boot mode configuration */
311 int generic_mode_pins(void)
312 {
313         pr_warning("generic_mode_pins(): missing mode pin configuration\n");
314         return 0;
315 }
316
317 int test_mode_pin(int pin)
318 {
319         return sh_mv.mv_mode_pins() & pin;
320 }