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/ioport.h>
11 #include <linux/init.h>
12 #include <linux/initrd.h>
13 #include <linux/console.h>
14 #include <linux/root_dev.h>
15 #include <linux/utsname.h>
16 #include <linux/nodemask.h>
17 #include <linux/cpu.h>
18 #include <linux/pfn.h>
19 #include <linux/fs.h>
20 #include <linux/mm.h>
21 #include <linux/kexec.h>
22 #include <linux/module.h>
23 #include <linux/smp.h>
24 #include <linux/err.h>
25 #include <linux/crash_dump.h>
26 #include <linux/mmzone.h>
27 #include <linux/clk.h>
28 #include <linux/delay.h>
29 #include <linux/platform_device.h>
30 #include <linux/memblock.h>
31 #include <linux/of.h>
32 #include <linux/of_fdt.h>
33 #include <linux/uaccess.h>
34 #include <uapi/linux/mount.h>
35 #include <asm/io.h>
36 #include <asm/page.h>
37 #include <asm/elf.h>
38 #include <asm/sections.h>
39 #include <asm/irq.h>
40 #include <asm/setup.h>
41 #include <asm/clock.h>
42 #include <asm/smp.h>
43 #include <asm/mmu_context.h>
44 #include <asm/mmzone.h>
45 #include <asm/processor.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 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_SYSTEM_RAM,
82 };
83
84 static struct resource data_resource = {
85 .name = "Kernel data",
86 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
87 };
88
89 static struct resource bss_resource = {
90 .name = "Kernel bss",
91 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
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
175 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY
calibrate_delay(void)176 void calibrate_delay(void)
177 {
178 struct clk *clk = clk_get(NULL, "cpu_clk");
179
180 if (IS_ERR(clk))
181 panic("Need a sane CPU clock definition!");
182
183 loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
184
185 printk(KERN_INFO "Calibrating delay loop (skipped)... "
186 "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
187 loops_per_jiffy/(500000/HZ),
188 (loops_per_jiffy/(5000/HZ)) % 100,
189 loops_per_jiffy);
190 }
191 #endif
192
__add_active_range(unsigned int nid,unsigned long start_pfn,unsigned long end_pfn)193 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
194 unsigned long end_pfn)
195 {
196 struct resource *res = &mem_resources[nid];
197 unsigned long start, end;
198
199 WARN_ON(res->name); /* max one active range per node for now */
200
201 start = start_pfn << PAGE_SHIFT;
202 end = end_pfn << PAGE_SHIFT;
203
204 res->name = "System RAM";
205 res->start = start;
206 res->end = end - 1;
207 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
208
209 if (request_resource(&iomem_resource, res)) {
210 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
211 start_pfn, end_pfn);
212 return;
213 }
214
215 /*
216 * We don't know which RAM region contains kernel data or
217 * the reserved crashkernel region, so try it repeatedly
218 * and let the resource manager test it.
219 */
220 request_resource(res, &code_resource);
221 request_resource(res, &data_resource);
222 request_resource(res, &bss_resource);
223 #ifdef CONFIG_CRASH_RESERVE
224 request_resource(res, &crashk_res);
225 #endif
226
227 /*
228 * Also make sure that there is a PMB mapping that covers this
229 * range before we attempt to activate it, to avoid reset by MMU.
230 * We can hit this path with NUMA or memory hot-add.
231 */
232 pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
233 PAGE_KERNEL);
234
235 memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
236 &memblock.memory, nid);
237 }
238
plat_early_device_setup(void)239 void __init __weak plat_early_device_setup(void)
240 {
241 }
242
243 #ifdef CONFIG_OF_EARLY_FLATTREE
sh_fdt_init(phys_addr_t dt_phys)244 void __ref sh_fdt_init(phys_addr_t dt_phys)
245 {
246 static int done = 0;
247 void *dt_virt;
248
249 /* Avoid calling an __init function on secondary cpus. */
250 if (done) return;
251
252 #ifdef CONFIG_USE_BUILTIN_DTB
253 dt_virt = __dtb_start;
254 #else
255 dt_virt = phys_to_virt(dt_phys);
256 #endif
257
258 if (!dt_virt || !early_init_dt_scan(dt_virt)) {
259 pr_crit("Error: invalid device tree blob"
260 " at physical address %p\n", (void *)dt_phys);
261
262 while (true)
263 cpu_relax();
264 }
265
266 done = 1;
267 }
268 #endif
269
setup_arch(char ** cmdline_p)270 void __init setup_arch(char **cmdline_p)
271 {
272 enable_mmu();
273
274 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
275
276 printk(KERN_NOTICE "Boot params:\n"
277 "... MOUNT_ROOT_RDONLY - %08lx\n"
278 "... RAMDISK_FLAGS - %08lx\n"
279 "... ORIG_ROOT_DEV - %08lx\n"
280 "... LOADER_TYPE - %08lx\n"
281 "... INITRD_START - %08lx\n"
282 "... INITRD_SIZE - %08lx\n",
283 MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
284 ORIG_ROOT_DEV, LOADER_TYPE,
285 INITRD_START, INITRD_SIZE);
286
287 #ifdef CONFIG_BLK_DEV_RAM
288 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
289 #endif
290
291 if (!MOUNT_ROOT_RDONLY)
292 root_mountflags &= ~MS_RDONLY;
293 setup_initial_init_mm(_text, _etext, _edata, _end);
294
295 code_resource.start = virt_to_phys(_text);
296 code_resource.end = virt_to_phys(_etext)-1;
297 data_resource.start = virt_to_phys(_etext);
298 data_resource.end = virt_to_phys(_edata)-1;
299 bss_resource.start = virt_to_phys(__bss_start);
300 bss_resource.end = virt_to_phys(__bss_stop)-1;
301
302 #ifdef CONFIG_CMDLINE_OVERWRITE
303 strscpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
304 #else
305 strscpy(command_line, COMMAND_LINE, sizeof(command_line));
306 #ifdef CONFIG_CMDLINE_EXTEND
307 strlcat(command_line, " ", sizeof(command_line));
308 strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
309 #endif
310 #endif
311
312 /* Save unparsed command line copy for /proc/cmdline */
313 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
314 *cmdline_p = command_line;
315
316 parse_early_param();
317
318 plat_early_device_setup();
319
320 sh_mv_setup();
321
322 /* Let earlyprintk output early console messages */
323 sh_early_platform_driver_probe("earlyprintk", 1, 1);
324
325 #ifdef CONFIG_OF_EARLY_FLATTREE
326 #ifdef CONFIG_USE_BUILTIN_DTB
327 unflatten_and_copy_device_tree();
328 #else
329 unflatten_device_tree();
330 #endif
331 #endif
332
333 paging_init();
334
335 /* Perform the machine specific initialisation */
336 if (likely(sh_mv.mv_setup))
337 sh_mv.mv_setup(cmdline_p);
338
339 plat_smp_setup();
340 }
341
342 /* processor boot mode configuration */
generic_mode_pins(void)343 int generic_mode_pins(void)
344 {
345 pr_warn("generic_mode_pins(): missing mode pin configuration\n");
346 return 0;
347 }
348
test_mode_pin(int pin)349 int test_mode_pin(int pin)
350 {
351 return sh_mv.mv_mode_pins() & pin;
352 }
353
arch_cpu_finalize_init(void)354 void __init arch_cpu_finalize_init(void)
355 {
356 char *p = &init_utsname()->machine[2]; /* "sh" */
357
358 select_idle_routine();
359
360 current_cpu_data.loops_per_jiffy = loops_per_jiffy;
361
362 switch (current_cpu_data.family) {
363 case CPU_FAMILY_SH2:
364 *p++ = '2';
365 break;
366 case CPU_FAMILY_SH2A:
367 *p++ = '2';
368 *p++ = 'a';
369 break;
370 case CPU_FAMILY_SH3:
371 *p++ = '3';
372 break;
373 case CPU_FAMILY_SH4:
374 *p++ = '4';
375 break;
376 case CPU_FAMILY_SH4A:
377 *p++ = '4';
378 *p++ = 'a';
379 break;
380 case CPU_FAMILY_SH4AL_DSP:
381 *p++ = '4';
382 *p++ = 'a';
383 *p++ = 'l';
384 *p++ = '-';
385 *p++ = 'd';
386 *p++ = 's';
387 *p++ = 'p';
388 break;
389 case CPU_FAMILY_UNKNOWN:
390 /*
391 * Specifically use CPU_FAMILY_UNKNOWN rather than
392 * default:, so we're able to have the compiler whine
393 * about unhandled enumerations.
394 */
395 break;
396 }
397
398 pr_info("CPU: %s\n", get_cpu_subtype(¤t_cpu_data));
399
400 #ifndef __LITTLE_ENDIAN__
401 /* 'eb' means 'Endian Big' */
402 *p++ = 'e';
403 *p++ = 'b';
404 #endif
405 *p = '\0';
406 }
407