1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * arch/sh/kernel/setup.c
4  *
5  * This file handles the architecture-dependent parts of initialization
6  *
7  *  Copyright (C) 1999  Niibe Yutaka
8  *  Copyright (C) 2002 - 2010 Paul Mundt
9  */
10 #include <linux/screen_info.h>
11 #include <linux/ioport.h>
12 #include <linux/init.h>
13 #include <linux/initrd.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 <linux/uaccess.h>
35 #include <uapi/linux/mount.h>
36 #include <asm/io.h>
37 #include <asm/page.h>
38 #include <asm/elf.h>
39 #include <asm/sections.h>
40 #include <asm/irq.h>
41 #include <asm/setup.h>
42 #include <asm/clock.h>
43 #include <asm/smp.h>
44 #include <asm/mmu_context.h>
45 #include <asm/mmzone.h>
46 #include <asm/processor.h>
47 #include <asm/sparsemem.h>
48 #include <asm/platform_early.h>
49 
50 /*
51  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
52  * This value will be used at the very early stage of serial setup.
53  * The bigger value means no problem.
54  */
55 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
56 	[0] = {
57 		.type			= CPU_SH_NONE,
58 		.family			= CPU_FAMILY_UNKNOWN,
59 		.loops_per_jiffy	= 10000000,
60 		.phys_bits		= MAX_PHYSMEM_BITS,
61 	},
62 };
63 EXPORT_SYMBOL(cpu_data);
64 
65 /*
66  * The machine vector. First entry in .machvec.init, or clobbered by
67  * sh_mv= on the command line, prior to .machvec.init teardown.
68  */
69 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
70 EXPORT_SYMBOL(sh_mv);
71 
72 #ifdef CONFIG_VT
73 struct screen_info screen_info;
74 #endif
75 
76 extern int root_mountflags;
77 
78 #define RAMDISK_IMAGE_START_MASK	0x07FF
79 #define RAMDISK_PROMPT_FLAG		0x8000
80 #define RAMDISK_LOAD_FLAG		0x4000
81 
82 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
83 
84 static struct resource code_resource = {
85 	.name = "Kernel code",
86 	.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
87 };
88 
89 static struct resource data_resource = {
90 	.name = "Kernel data",
91 	.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
92 };
93 
94 static struct resource bss_resource = {
95 	.name	= "Kernel bss",
96 	.flags	= IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
97 };
98 
99 unsigned long memory_start;
100 EXPORT_SYMBOL(memory_start);
101 unsigned long memory_end = 0;
102 EXPORT_SYMBOL(memory_end);
103 unsigned long memory_limit = 0;
104 
105 static struct resource mem_resources[MAX_NUMNODES];
106 
107 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
108 
early_parse_mem(char * p)109 static int __init early_parse_mem(char *p)
110 {
111 	if (!p)
112 		return 1;
113 
114 	memory_limit = PAGE_ALIGN(memparse(p, &p));
115 
116 	pr_notice("Memory limited to %ldMB\n", memory_limit >> 20);
117 
118 	return 0;
119 }
120 early_param("mem", early_parse_mem);
121 
check_for_initrd(void)122 void __init check_for_initrd(void)
123 {
124 #ifdef CONFIG_BLK_DEV_INITRD
125 	unsigned long start, end;
126 
127 	/*
128 	 * Check for the rare cases where boot loaders adhere to the boot
129 	 * ABI.
130 	 */
131 	if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE)
132 		goto disable;
133 
134 	start = INITRD_START + __MEMORY_START;
135 	end = start + INITRD_SIZE;
136 
137 	if (unlikely(end <= start))
138 		goto disable;
139 	if (unlikely(start & ~PAGE_MASK)) {
140 		pr_err("initrd must be page aligned\n");
141 		goto disable;
142 	}
143 
144 	if (unlikely(start < __MEMORY_START)) {
145 		pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n",
146 			start, __MEMORY_START);
147 		goto disable;
148 	}
149 
150 	if (unlikely(end > memblock_end_of_DRAM())) {
151 		pr_err("initrd extends beyond end of memory "
152 		       "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
153 		       end, (unsigned long)memblock_end_of_DRAM());
154 		goto disable;
155 	}
156 
157 	/*
158 	 * If we got this far in spite of the boot loader's best efforts
159 	 * to the contrary, assume we actually have a valid initrd and
160 	 * fix up the root dev.
161 	 */
162 	ROOT_DEV = Root_RAM0;
163 
164 	/*
165 	 * Address sanitization
166 	 */
167 	initrd_start = (unsigned long)__va(start);
168 	initrd_end = initrd_start + INITRD_SIZE;
169 
170 	memblock_reserve(__pa(initrd_start), INITRD_SIZE);
171 
172 	return;
173 
174 disable:
175 	pr_info("initrd disabled\n");
176 	initrd_start = initrd_end = 0;
177 #endif
178 }
179 
180 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY
calibrate_delay(void)181 void calibrate_delay(void)
182 {
183 	struct clk *clk = clk_get(NULL, "cpu_clk");
184 
185 	if (IS_ERR(clk))
186 		panic("Need a sane CPU clock definition!");
187 
188 	loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
189 
190 	printk(KERN_INFO "Calibrating delay loop (skipped)... "
191 			 "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
192 			 loops_per_jiffy/(500000/HZ),
193 			 (loops_per_jiffy/(5000/HZ)) % 100,
194 			 loops_per_jiffy);
195 }
196 #endif
197 
__add_active_range(unsigned int nid,unsigned long start_pfn,unsigned long end_pfn)198 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
199 						unsigned long end_pfn)
200 {
201 	struct resource *res = &mem_resources[nid];
202 	unsigned long start, end;
203 
204 	WARN_ON(res->name); /* max one active range per node for now */
205 
206 	start = start_pfn << PAGE_SHIFT;
207 	end = end_pfn << PAGE_SHIFT;
208 
209 	res->name = "System RAM";
210 	res->start = start;
211 	res->end = end - 1;
212 	res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
213 
214 	if (request_resource(&iomem_resource, res)) {
215 		pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
216 		       start_pfn, end_pfn);
217 		return;
218 	}
219 
220 	/*
221 	 * We don't know which RAM region contains kernel data or
222 	 * the reserved crashkernel region, so try it repeatedly
223 	 * and let the resource manager test it.
224 	 */
225 	request_resource(res, &code_resource);
226 	request_resource(res, &data_resource);
227 	request_resource(res, &bss_resource);
228 #ifdef CONFIG_KEXEC
229 	request_resource(res, &crashk_res);
230 #endif
231 
232 	/*
233 	 * Also make sure that there is a PMB mapping that covers this
234 	 * range before we attempt to activate it, to avoid reset by MMU.
235 	 * We can hit this path with NUMA or memory hot-add.
236 	 */
237 	pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
238 			 PAGE_KERNEL);
239 
240 	memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
241 			  &memblock.memory, nid);
242 }
243 
plat_early_device_setup(void)244 void __init __weak plat_early_device_setup(void)
245 {
246 }
247 
248 #ifdef CONFIG_OF_EARLY_FLATTREE
sh_fdt_init(phys_addr_t dt_phys)249 void __ref sh_fdt_init(phys_addr_t dt_phys)
250 {
251 	static int done = 0;
252 	void *dt_virt;
253 
254 	/* Avoid calling an __init function on secondary cpus. */
255 	if (done) return;
256 
257 #ifdef CONFIG_USE_BUILTIN_DTB
258 	dt_virt = __dtb_start;
259 #else
260 	dt_virt = phys_to_virt(dt_phys);
261 #endif
262 
263 	if (!dt_virt || !early_init_dt_scan(dt_virt)) {
264 		pr_crit("Error: invalid device tree blob"
265 			" at physical address %p\n", (void *)dt_phys);
266 
267 		while (true)
268 			cpu_relax();
269 	}
270 
271 	done = 1;
272 }
273 #endif
274 
setup_arch(char ** cmdline_p)275 void __init setup_arch(char **cmdline_p)
276 {
277 	enable_mmu();
278 
279 	ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
280 
281 	printk(KERN_NOTICE "Boot params:\n"
282 			   "... MOUNT_ROOT_RDONLY - %08lx\n"
283 			   "... RAMDISK_FLAGS     - %08lx\n"
284 			   "... ORIG_ROOT_DEV     - %08lx\n"
285 			   "... LOADER_TYPE       - %08lx\n"
286 			   "... INITRD_START      - %08lx\n"
287 			   "... INITRD_SIZE       - %08lx\n",
288 			   MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
289 			   ORIG_ROOT_DEV, LOADER_TYPE,
290 			   INITRD_START, INITRD_SIZE);
291 
292 #ifdef CONFIG_BLK_DEV_RAM
293 	rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
294 #endif
295 
296 	if (!MOUNT_ROOT_RDONLY)
297 		root_mountflags &= ~MS_RDONLY;
298 	setup_initial_init_mm(_text, _etext, _edata, _end);
299 
300 	code_resource.start = virt_to_phys(_text);
301 	code_resource.end = virt_to_phys(_etext)-1;
302 	data_resource.start = virt_to_phys(_etext);
303 	data_resource.end = virt_to_phys(_edata)-1;
304 	bss_resource.start = virt_to_phys(__bss_start);
305 	bss_resource.end = virt_to_phys(__bss_stop)-1;
306 
307 #ifdef CONFIG_CMDLINE_OVERWRITE
308 	strscpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
309 #else
310 	strscpy(command_line, COMMAND_LINE, sizeof(command_line));
311 #ifdef CONFIG_CMDLINE_EXTEND
312 	strlcat(command_line, " ", sizeof(command_line));
313 	strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
314 #endif
315 #endif
316 
317 	/* Save unparsed command line copy for /proc/cmdline */
318 	memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
319 	*cmdline_p = command_line;
320 
321 	parse_early_param();
322 
323 	plat_early_device_setup();
324 
325 	sh_mv_setup();
326 
327 	/* Let earlyprintk output early console messages */
328 	sh_early_platform_driver_probe("earlyprintk", 1, 1);
329 
330 #ifdef CONFIG_OF_EARLY_FLATTREE
331 #ifdef CONFIG_USE_BUILTIN_DTB
332 	unflatten_and_copy_device_tree();
333 #else
334 	unflatten_device_tree();
335 #endif
336 #endif
337 
338 	paging_init();
339 
340 	/* Perform the machine specific initialisation */
341 	if (likely(sh_mv.mv_setup))
342 		sh_mv.mv_setup(cmdline_p);
343 
344 	plat_smp_setup();
345 }
346 
347 /* processor boot mode configuration */
generic_mode_pins(void)348 int generic_mode_pins(void)
349 {
350 	pr_warn("generic_mode_pins(): missing mode pin configuration\n");
351 	return 0;
352 }
353 
test_mode_pin(int pin)354 int test_mode_pin(int pin)
355 {
356 	return sh_mv.mv_mode_pins() & pin;
357 }
358 
arch_cpu_finalize_init(void)359 void __init arch_cpu_finalize_init(void)
360 {
361 	char *p = &init_utsname()->machine[2]; /* "sh" */
362 
363 	select_idle_routine();
364 
365 	current_cpu_data.loops_per_jiffy = loops_per_jiffy;
366 
367 	switch (current_cpu_data.family) {
368 	case CPU_FAMILY_SH2:
369 		*p++ = '2';
370 		break;
371 	case CPU_FAMILY_SH2A:
372 		*p++ = '2';
373 		*p++ = 'a';
374 		break;
375 	case CPU_FAMILY_SH3:
376 		*p++ = '3';
377 		break;
378 	case CPU_FAMILY_SH4:
379 		*p++ = '4';
380 		break;
381 	case CPU_FAMILY_SH4A:
382 		*p++ = '4';
383 		*p++ = 'a';
384 		break;
385 	case CPU_FAMILY_SH4AL_DSP:
386 		*p++ = '4';
387 		*p++ = 'a';
388 		*p++ = 'l';
389 		*p++ = '-';
390 		*p++ = 'd';
391 		*p++ = 's';
392 		*p++ = 'p';
393 		break;
394 	case CPU_FAMILY_UNKNOWN:
395 		/*
396 		 * Specifically use CPU_FAMILY_UNKNOWN rather than
397 		 * default:, so we're able to have the compiler whine
398 		 * about unhandled enumerations.
399 		 */
400 		break;
401 	}
402 
403 	pr_info("CPU: %s\n", get_cpu_subtype(&current_cpu_data));
404 
405 #ifndef __LITTLE_ENDIAN__
406 	/* 'eb' means 'Endian Big' */
407 	*p++ = 'e';
408 	*p++ = 'b';
409 #endif
410 	*p = '\0';
411 }
412