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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 <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