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
48 /*
49 * Initialize loops_per_jiffy as 10000000 (1000MIPS).
50 * This value will be used at the very early stage of serial setup.
51 * The bigger value means no problem.
52 */
53 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
54 [0] = {
55 .type = CPU_SH_NONE,
56 .family = CPU_FAMILY_UNKNOWN,
57 .loops_per_jiffy = 10000000,
58 .phys_bits = MAX_PHYSMEM_BITS,
59 },
60 };
61 EXPORT_SYMBOL(cpu_data);
62
63 /*
64 * The machine vector. First entry in .machvec.init, or clobbered by
65 * sh_mv= on the command line, prior to .machvec.init teardown.
66 */
67 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
68 EXPORT_SYMBOL(sh_mv);
69
70 #ifdef CONFIG_VT
71 struct screen_info screen_info;
72 #endif
73
74 extern int root_mountflags;
75
76 #define RAMDISK_IMAGE_START_MASK 0x07FF
77 #define RAMDISK_PROMPT_FLAG 0x8000
78 #define RAMDISK_LOAD_FLAG 0x4000
79
80 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
81
82 static struct resource code_resource = {
83 .name = "Kernel code",
84 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
85 };
86
87 static struct resource data_resource = {
88 .name = "Kernel data",
89 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
90 };
91
92 static struct resource bss_resource = {
93 .name = "Kernel bss",
94 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
95 };
96
97 unsigned long memory_start;
98 EXPORT_SYMBOL(memory_start);
99 unsigned long memory_end = 0;
100 EXPORT_SYMBOL(memory_end);
101 unsigned long memory_limit = 0;
102
103 static struct resource mem_resources[MAX_NUMNODES];
104
105 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
106
early_parse_mem(char * p)107 static int __init early_parse_mem(char *p)
108 {
109 if (!p)
110 return 1;
111
112 memory_limit = PAGE_ALIGN(memparse(p, &p));
113
114 pr_notice("Memory limited to %ldMB\n", memory_limit >> 20);
115
116 return 0;
117 }
118 early_param("mem", early_parse_mem);
119
check_for_initrd(void)120 void __init check_for_initrd(void)
121 {
122 #ifdef CONFIG_BLK_DEV_INITRD
123 unsigned long start, end;
124
125 /*
126 * Check for the rare cases where boot loaders adhere to the boot
127 * ABI.
128 */
129 if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE)
130 goto disable;
131
132 start = INITRD_START + __MEMORY_START;
133 end = start + INITRD_SIZE;
134
135 if (unlikely(end <= start))
136 goto disable;
137 if (unlikely(start & ~PAGE_MASK)) {
138 pr_err("initrd must be page aligned\n");
139 goto disable;
140 }
141
142 if (unlikely(start < __MEMORY_START)) {
143 pr_err("initrd start (%08lx) < __MEMORY_START(%x)\n",
144 start, __MEMORY_START);
145 goto disable;
146 }
147
148 if (unlikely(end > memblock_end_of_DRAM())) {
149 pr_err("initrd extends beyond end of memory "
150 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
151 end, (unsigned long)memblock_end_of_DRAM());
152 goto disable;
153 }
154
155 /*
156 * If we got this far in spite of the boot loader's best efforts
157 * to the contrary, assume we actually have a valid initrd and
158 * fix up the root dev.
159 */
160 ROOT_DEV = Root_RAM0;
161
162 /*
163 * Address sanitization
164 */
165 initrd_start = (unsigned long)__va(start);
166 initrd_end = initrd_start + INITRD_SIZE;
167
168 memblock_reserve(__pa(initrd_start), INITRD_SIZE);
169
170 return;
171
172 disable:
173 pr_info("initrd disabled\n");
174 initrd_start = initrd_end = 0;
175 #endif
176 }
177
178 #ifndef CONFIG_GENERIC_CALIBRATE_DELAY
calibrate_delay(void)179 void calibrate_delay(void)
180 {
181 struct clk *clk = clk_get(NULL, "cpu_clk");
182
183 if (IS_ERR(clk))
184 panic("Need a sane CPU clock definition!");
185
186 loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
187
188 printk(KERN_INFO "Calibrating delay loop (skipped)... "
189 "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
190 loops_per_jiffy/(500000/HZ),
191 (loops_per_jiffy/(5000/HZ)) % 100,
192 loops_per_jiffy);
193 }
194 #endif
195
__add_active_range(unsigned int nid,unsigned long start_pfn,unsigned long end_pfn)196 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
197 unsigned long end_pfn)
198 {
199 struct resource *res = &mem_resources[nid];
200 unsigned long start, end;
201
202 WARN_ON(res->name); /* max one active range per node for now */
203
204 start = start_pfn << PAGE_SHIFT;
205 end = end_pfn << PAGE_SHIFT;
206
207 res->name = "System RAM";
208 res->start = start;
209 res->end = end - 1;
210 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
211
212 if (request_resource(&iomem_resource, res)) {
213 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
214 start_pfn, end_pfn);
215 return;
216 }
217
218 /*
219 * We don't know which RAM region contains kernel data or
220 * the reserved crashkernel region, so try it repeatedly
221 * and let the resource manager test it.
222 */
223 request_resource(res, &code_resource);
224 request_resource(res, &data_resource);
225 request_resource(res, &bss_resource);
226 #ifdef CONFIG_KEXEC
227 request_resource(res, &crashk_res);
228 #endif
229
230 /*
231 * Also make sure that there is a PMB mapping that covers this
232 * range before we attempt to activate it, to avoid reset by MMU.
233 * We can hit this path with NUMA or memory hot-add.
234 */
235 pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
236 PAGE_KERNEL);
237
238 memblock_set_node(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
239 &memblock.memory, nid);
240 }
241
plat_early_device_setup(void)242 void __init __weak plat_early_device_setup(void)
243 {
244 }
245
246 #ifdef CONFIG_OF_FLATTREE
sh_fdt_init(phys_addr_t dt_phys)247 void __ref sh_fdt_init(phys_addr_t dt_phys)
248 {
249 static int done = 0;
250 void *dt_virt;
251
252 /* Avoid calling an __init function on secondary cpus. */
253 if (done) return;
254
255 #ifdef CONFIG_USE_BUILTIN_DTB
256 dt_virt = __dtb_start;
257 #else
258 dt_virt = phys_to_virt(dt_phys);
259 #endif
260
261 if (!dt_virt || !early_init_dt_scan(dt_virt)) {
262 pr_crit("Error: invalid device tree blob"
263 " at physical address %p\n", (void *)dt_phys);
264
265 while (true)
266 cpu_relax();
267 }
268
269 done = 1;
270 }
271 #endif
272
setup_arch(char ** cmdline_p)273 void __init setup_arch(char **cmdline_p)
274 {
275 enable_mmu();
276
277 ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
278
279 printk(KERN_NOTICE "Boot params:\n"
280 "... MOUNT_ROOT_RDONLY - %08lx\n"
281 "... RAMDISK_FLAGS - %08lx\n"
282 "... ORIG_ROOT_DEV - %08lx\n"
283 "... LOADER_TYPE - %08lx\n"
284 "... INITRD_START - %08lx\n"
285 "... INITRD_SIZE - %08lx\n",
286 MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
287 ORIG_ROOT_DEV, LOADER_TYPE,
288 INITRD_START, INITRD_SIZE);
289
290 #ifdef CONFIG_BLK_DEV_RAM
291 rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
292 rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
293 rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
294 #endif
295
296 if (!MOUNT_ROOT_RDONLY)
297 root_mountflags &= ~MS_RDONLY;
298 init_mm.start_code = (unsigned long) _text;
299 init_mm.end_code = (unsigned long) _etext;
300 init_mm.end_data = (unsigned long) _edata;
301 init_mm.brk = (unsigned long) _end;
302
303 code_resource.start = virt_to_phys(_text);
304 code_resource.end = virt_to_phys(_etext)-1;
305 data_resource.start = virt_to_phys(_etext);
306 data_resource.end = virt_to_phys(_edata)-1;
307 bss_resource.start = virt_to_phys(__bss_start);
308 bss_resource.end = virt_to_phys(__bss_stop)-1;
309
310 #ifdef CONFIG_CMDLINE_OVERWRITE
311 strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
312 #else
313 strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
314 #ifdef CONFIG_CMDLINE_EXTEND
315 strlcat(command_line, " ", sizeof(command_line));
316 strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
317 #endif
318 #endif
319
320 /* Save unparsed command line copy for /proc/cmdline */
321 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
322 *cmdline_p = command_line;
323
324 parse_early_param();
325
326 plat_early_device_setup();
327
328 sh_mv_setup();
329
330 /* Let earlyprintk output early console messages */
331 early_platform_driver_probe("earlyprintk", 1, 1);
332
333 #ifdef CONFIG_OF_FLATTREE
334 #ifdef CONFIG_USE_BUILTIN_DTB
335 unflatten_and_copy_device_tree();
336 #else
337 unflatten_device_tree();
338 #endif
339 #endif
340
341 paging_init();
342
343 #ifdef CONFIG_DUMMY_CONSOLE
344 conswitchp = &dummy_con;
345 #endif
346
347 /* Perform the machine specific initialisation */
348 if (likely(sh_mv.mv_setup))
349 sh_mv.mv_setup(cmdline_p);
350
351 plat_smp_setup();
352 }
353
354 /* processor boot mode configuration */
generic_mode_pins(void)355 int generic_mode_pins(void)
356 {
357 pr_warning("generic_mode_pins(): missing mode pin configuration\n");
358 return 0;
359 }
360
test_mode_pin(int pin)361 int test_mode_pin(int pin)
362 {
363 return sh_mv.mv_mode_pins() & pin;
364 }
365
