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 init_mm.start_code = (unsigned long) _text;
298 init_mm.end_code = (unsigned long) _etext;
299 init_mm.end_data = (unsigned long) _edata;
300 init_mm.brk = (unsigned long) _end;
301
302 code_resource.start = virt_to_phys(_text);
303 code_resource.end = virt_to_phys(_etext)-1;
304 data_resource.start = virt_to_phys(_etext);
305 data_resource.end = virt_to_phys(_edata)-1;
306 bss_resource.start = virt_to_phys(__bss_start);
307 bss_resource.end = virt_to_phys(__bss_stop)-1;
308
309 #ifdef CONFIG_CMDLINE_OVERWRITE
310 strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
311 #else
312 strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
313 #ifdef CONFIG_CMDLINE_EXTEND
314 strlcat(command_line, " ", sizeof(command_line));
315 strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
316 #endif
317 #endif
318
319 /* Save unparsed command line copy for /proc/cmdline */
320 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
321 *cmdline_p = command_line;
322
323 parse_early_param();
324
325 plat_early_device_setup();
326
327 sh_mv_setup();
328
329 /* Let earlyprintk output early console messages */
330 sh_early_platform_driver_probe("earlyprintk", 1, 1);
331
332 #ifdef CONFIG_OF_FLATTREE
333 #ifdef CONFIG_USE_BUILTIN_DTB
334 unflatten_and_copy_device_tree();
335 #else
336 unflatten_device_tree();
337 #endif
338 #endif
339
340 paging_init();
341
342 /* Perform the machine specific initialisation */
343 if (likely(sh_mv.mv_setup))
344 sh_mv.mv_setup(cmdline_p);
345
346 plat_smp_setup();
347 }
348
349 /* processor boot mode configuration */
generic_mode_pins(void)350 int generic_mode_pins(void)
351 {
352 pr_warn("generic_mode_pins(): missing mode pin configuration\n");
353 return 0;
354 }
355
test_mode_pin(int pin)356 int test_mode_pin(int pin)
357 {
358 return sh_mv.mv_mode_pins() & pin;
359 }
360
