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