Merge tag 'driver-core-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[sfrench/cifs-2.6.git] / arch / sh / kernel / setup.c
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
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
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
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
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
243 void __init __weak plat_early_device_setup(void)
244 {
245 }
246
247 #ifdef CONFIG_OF_FLATTREE
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
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         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
294         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
295 #endif
296
297         if (!MOUNT_ROOT_RDONLY)
298                 root_mountflags &= ~MS_RDONLY;
299         init_mm.start_code = (unsigned long) _text;
300         init_mm.end_code = (unsigned long) _etext;
301         init_mm.end_data = (unsigned long) _edata;
302         init_mm.brk = (unsigned long) _end;
303
304         code_resource.start = virt_to_phys(_text);
305         code_resource.end = virt_to_phys(_etext)-1;
306         data_resource.start = virt_to_phys(_etext);
307         data_resource.end = virt_to_phys(_edata)-1;
308         bss_resource.start = virt_to_phys(__bss_start);
309         bss_resource.end = virt_to_phys(__bss_stop)-1;
310
311 #ifdef CONFIG_CMDLINE_OVERWRITE
312         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
313 #else
314         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
315 #ifdef CONFIG_CMDLINE_EXTEND
316         strlcat(command_line, " ", sizeof(command_line));
317         strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
318 #endif
319 #endif
320
321         /* Save unparsed command line copy for /proc/cmdline */
322         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
323         *cmdline_p = command_line;
324
325         parse_early_param();
326
327         plat_early_device_setup();
328
329         sh_mv_setup();
330
331         /* Let earlyprintk output early console messages */
332         sh_early_platform_driver_probe("earlyprintk", 1, 1);
333
334 #ifdef CONFIG_OF_FLATTREE
335 #ifdef CONFIG_USE_BUILTIN_DTB
336         unflatten_and_copy_device_tree();
337 #else
338         unflatten_device_tree();
339 #endif
340 #endif
341
342         paging_init();
343
344 #ifdef CONFIG_DUMMY_CONSOLE
345         conswitchp = &dummy_con;
346 #endif
347
348         /* Perform the machine specific initialisation */
349         if (likely(sh_mv.mv_setup))
350                 sh_mv.mv_setup(cmdline_p);
351
352         plat_smp_setup();
353 }
354
355 /* processor boot mode configuration */
356 int generic_mode_pins(void)
357 {
358         pr_warn("generic_mode_pins(): missing mode pin configuration\n");
359         return 0;
360 }
361
362 int test_mode_pin(int pin)
363 {
364         return sh_mv.mv_mode_pins() & pin;
365 }