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(¤t_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