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 */
50struct 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};
58EXPORT_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 */
64struct sh_machine_vector sh_mv = { .mv_name = "generic", };
65EXPORT_SYMBOL(sh_mv);
66
67#ifdef CONFIG_VT
68struct screen_info screen_info;
69#endif
70
71extern int root_mountflags;
72
73#define RAMDISK_IMAGE_START_MASK	0x07FF
74#define RAMDISK_PROMPT_FLAG		0x8000
75#define RAMDISK_LOAD_FLAG		0x4000
76
77static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
78
79static struct resource code_resource = {
80	.name = "Kernel code",
81	.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
82};
83
84static struct resource data_resource = {
85	.name = "Kernel data",
86	.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
87};
88
89static struct resource bss_resource = {
90	.name	= "Kernel bss",
91	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM,
92};
93
94unsigned long memory_start;
95EXPORT_SYMBOL(memory_start);
96unsigned long memory_end = 0;
97EXPORT_SYMBOL(memory_end);
98unsigned long memory_limit = 0;
99
100static struct resource mem_resources[MAX_NUMNODES];
101
102int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
103
104static 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}
115early_param("mem", early_parse_mem);
116
117void __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
169disable:
170	pr_info("initrd disabled\n");
171	initrd_start = initrd_end = 0;
172#endif
173}
174
175void 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
191void __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
237void __init __weak plat_early_device_setup(void)
238{
239}
240
241void __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 */
315int generic_mode_pins(void)
316{
317	pr_warning("generic_mode_pins(): missing mode pin configuration\n");
318	return 0;
319}
320
321int test_mode_pin(int pin)
322{
323	return sh_mv.mv_mode_pins() & pin;
324}
325