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 | |
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 | |
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), size: 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 |
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 | |
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(root: &iomem_resource, new: 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(root: res, new: &code_resource); |
221 | request_resource(root: res, new: &data_resource); |
222 | request_resource(root: res, new: &bss_resource); |
223 | #ifdef CONFIG_CRASH_RESERVE |
224 | request_resource(root: res, new: &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 | type: &memblock.memory, nid); |
237 | } |
238 | |
239 | void __init __weak plat_early_device_setup(void) |
240 | { |
241 | } |
242 | |
243 | #ifdef CONFIG_OF_EARLY_FLATTREE |
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(address: dt_phys); |
256 | #endif |
257 | |
258 | if (!dt_virt || !early_init_dt_scan(params: 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 | |
270 | void __init setup_arch(char **cmdline_p) |
271 | { |
272 | enable_mmu(); |
273 | |
274 | ROOT_DEV = old_decode_dev(val: 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(start_code: _text, end_code: _etext, end_data: _edata, brk: _end); |
294 | |
295 | code_resource.start = virt_to_phys(address: _text); |
296 | code_resource.end = virt_to_phys(address: _etext)-1; |
297 | data_resource.start = virt_to_phys(address: _etext); |
298 | data_resource.end = virt_to_phys(address: _edata)-1; |
299 | bss_resource.start = virt_to_phys(address: __bss_start); |
300 | bss_resource.end = virt_to_phys(address: __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 */ |
343 | int generic_mode_pins(void) |
344 | { |
345 | pr_warn("generic_mode_pins(): missing mode pin configuration\n" ); |
346 | return 0; |
347 | } |
348 | |
349 | int test_mode_pin(int pin) |
350 | { |
351 | return sh_mv.mv_mode_pins() & pin; |
352 | } |
353 | |
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 | |