~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/openrisc/kernel/setup.c

Version: ~ [ linux-5.15-rc5 ] ~ [ linux-5.14.11 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.72 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.152 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.210 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.250 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.286 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.288 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * OpenRISC setup.c
  3  *
  4  * Linux architectural port borrowing liberally from similar works of
  5  * others.  All original copyrights apply as per the original source
  6  * declaration.
  7  *
  8  * Modifications for the OpenRISC architecture:
  9  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
 10  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
 11  *
 12  *      This program is free software; you can redistribute it and/or
 13  *      modify it under the terms of the GNU General Public License
 14  *      as published by the Free Software Foundation; either version
 15  *      2 of the License, or (at your option) any later version.
 16  *
 17  * This file handles the architecture-dependent parts of initialization
 18  */
 19 
 20 #include <linux/errno.h>
 21 #include <linux/sched.h>
 22 #include <linux/kernel.h>
 23 #include <linux/mm.h>
 24 #include <linux/stddef.h>
 25 #include <linux/unistd.h>
 26 #include <linux/ptrace.h>
 27 #include <linux/slab.h>
 28 #include <linux/tty.h>
 29 #include <linux/ioport.h>
 30 #include <linux/delay.h>
 31 #include <linux/console.h>
 32 #include <linux/init.h>
 33 #include <linux/bootmem.h>
 34 #include <linux/seq_file.h>
 35 #include <linux/serial.h>
 36 #include <linux/initrd.h>
 37 #include <linux/of_fdt.h>
 38 #include <linux/of.h>
 39 #include <linux/memblock.h>
 40 #include <linux/device.h>
 41 
 42 #include <asm/sections.h>
 43 #include <asm/segment.h>
 44 #include <asm/pgtable.h>
 45 #include <asm/types.h>
 46 #include <asm/setup.h>
 47 #include <asm/io.h>
 48 #include <asm/cpuinfo.h>
 49 #include <asm/delay.h>
 50 
 51 #include "vmlinux.h"
 52 
 53 static void __init setup_memory(void)
 54 {
 55         unsigned long ram_start_pfn;
 56         unsigned long ram_end_pfn;
 57         phys_addr_t memory_start, memory_end;
 58         struct memblock_region *region;
 59 
 60         memory_end = memory_start = 0;
 61 
 62         /* Find main memory where is the kernel, we assume its the only one */
 63         for_each_memblock(memory, region) {
 64                 memory_start = region->base;
 65                 memory_end = region->base + region->size;
 66                 printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__,
 67                        memory_start, memory_end);
 68         }
 69 
 70         if (!memory_end) {
 71                 panic("No memory!");
 72         }
 73 
 74         ram_start_pfn = PFN_UP(memory_start);
 75         ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
 76 
 77         /* setup bootmem globals (we use no_bootmem, but mm still depends on this) */
 78         min_low_pfn = ram_start_pfn;
 79         max_low_pfn = ram_end_pfn;
 80         max_pfn = ram_end_pfn;
 81 
 82         /*
 83          * initialize the boot-time allocator (with low memory only).
 84          *
 85          * This makes the memory from the end of the kernel to the end of
 86          * RAM usable.
 87          */
 88         memblock_reserve(__pa(_stext), _end - _stext);
 89 
 90         early_init_fdt_reserve_self();
 91         early_init_fdt_scan_reserved_mem();
 92 
 93         memblock_dump_all();
 94 }
 95 
 96 struct cpuinfo cpuinfo;
 97 
 98 static void print_cpuinfo(void)
 99 {
100         unsigned long upr = mfspr(SPR_UPR);
101         unsigned long vr = mfspr(SPR_VR);
102         unsigned int version;
103         unsigned int revision;
104 
105         version = (vr & SPR_VR_VER) >> 24;
106         revision = (vr & SPR_VR_REV);
107 
108         printk(KERN_INFO "CPU: OpenRISC-%x (revision %d) @%d MHz\n",
109                version, revision, cpuinfo.clock_frequency / 1000000);
110 
111         if (!(upr & SPR_UPR_UP)) {
112                 printk(KERN_INFO
113                        "-- no UPR register... unable to detect configuration\n");
114                 return;
115         }
116 
117         if (upr & SPR_UPR_DCP)
118                 printk(KERN_INFO
119                        "-- dcache: %4d bytes total, %2d bytes/line, %d way(s)\n",
120                        cpuinfo.dcache_size, cpuinfo.dcache_block_size, 1);
121         else
122                 printk(KERN_INFO "-- dcache disabled\n");
123         if (upr & SPR_UPR_ICP)
124                 printk(KERN_INFO
125                        "-- icache: %4d bytes total, %2d bytes/line, %d way(s)\n",
126                        cpuinfo.icache_size, cpuinfo.icache_block_size, 1);
127         else
128                 printk(KERN_INFO "-- icache disabled\n");
129 
130         if (upr & SPR_UPR_DMP)
131                 printk(KERN_INFO "-- dmmu: %4d entries, %lu way(s)\n",
132                        1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
133                        1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
134         if (upr & SPR_UPR_IMP)
135                 printk(KERN_INFO "-- immu: %4d entries, %lu way(s)\n",
136                        1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
137                        1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
138 
139         printk(KERN_INFO "-- additional features:\n");
140         if (upr & SPR_UPR_DUP)
141                 printk(KERN_INFO "-- debug unit\n");
142         if (upr & SPR_UPR_PCUP)
143                 printk(KERN_INFO "-- performance counters\n");
144         if (upr & SPR_UPR_PMP)
145                 printk(KERN_INFO "-- power management\n");
146         if (upr & SPR_UPR_PICP)
147                 printk(KERN_INFO "-- PIC\n");
148         if (upr & SPR_UPR_TTP)
149                 printk(KERN_INFO "-- timer\n");
150         if (upr & SPR_UPR_CUP)
151                 printk(KERN_INFO "-- custom unit(s)\n");
152 }
153 
154 void __init setup_cpuinfo(void)
155 {
156         struct device_node *cpu;
157         unsigned long iccfgr, dccfgr;
158         unsigned long cache_set_size, cache_ways;
159 
160         cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481");
161         if (!cpu)
162                 panic("No compatible CPU found in device tree...\n");
163 
164         iccfgr = mfspr(SPR_ICCFGR);
165         cache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
166         cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3);
167         cpuinfo.icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7);
168         cpuinfo.icache_size =
169             cache_set_size * cache_ways * cpuinfo.icache_block_size;
170 
171         dccfgr = mfspr(SPR_DCCFGR);
172         cache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
173         cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
174         cpuinfo.dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7);
175         cpuinfo.dcache_size =
176             cache_set_size * cache_ways * cpuinfo.dcache_block_size;
177 
178         if (of_property_read_u32(cpu, "clock-frequency",
179                                  &cpuinfo.clock_frequency)) {
180                 printk(KERN_WARNING
181                        "Device tree missing CPU 'clock-frequency' parameter."
182                        "Assuming frequency 25MHZ"
183                        "This is probably not what you want.");
184         }
185 
186         of_node_put(cpu);
187 
188         print_cpuinfo();
189 }
190 
191 /**
192  * or32_early_setup
193  *
194  * Handles the pointer to the device tree that this kernel is to use
195  * for establishing the available platform devices.
196  *
197  * Falls back on built-in device tree in case null pointer is passed.
198  */
199 
200 void __init or32_early_setup(void *fdt)
201 {
202         if (fdt)
203                 pr_info("FDT at %p\n", fdt);
204         else {
205                 fdt = __dtb_start;
206                 pr_info("Compiled-in FDT at %p\n", fdt);
207         }
208         early_init_devtree(fdt);
209 }
210 
211 static inline unsigned long extract_value_bits(unsigned long reg,
212                                                short bit_nr, short width)
213 {
214         return (reg >> bit_nr) & (0 << width);
215 }
216 
217 static inline unsigned long extract_value(unsigned long reg, unsigned long mask)
218 {
219         while (!(mask & 0x1)) {
220                 reg = reg >> 1;
221                 mask = mask >> 1;
222         }
223         return mask & reg;
224 }
225 
226 void __init detect_unit_config(unsigned long upr, unsigned long mask,
227                                char *text, void (*func) (void))
228 {
229         if (text != NULL)
230                 printk("%s", text);
231 
232         if (upr & mask) {
233                 if (func != NULL)
234                         func();
235                 else
236                         printk("present\n");
237         } else
238                 printk("not present\n");
239 }
240 
241 /*
242  * calibrate_delay
243  *
244  * Lightweight calibrate_delay implementation that calculates loops_per_jiffy
245  * from the clock frequency passed in via the device tree
246  *
247  */
248 
249 void calibrate_delay(void)
250 {
251         const int *val;
252         struct device_node *cpu = NULL;
253         cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481");
254         val = of_get_property(cpu, "clock-frequency", NULL);
255         if (!val)
256                 panic("no cpu 'clock-frequency' parameter in device tree");
257         loops_per_jiffy = *val / HZ;
258         pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
259                 loops_per_jiffy / (500000 / HZ),
260                 (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
261 }
262 
263 void __init setup_arch(char **cmdline_p)
264 {
265         unflatten_and_copy_device_tree();
266 
267         setup_cpuinfo();
268 
269         /* process 1's initial memory region is the kernel code/data */
270         init_mm.start_code = (unsigned long)_stext;
271         init_mm.end_code = (unsigned long)_etext;
272         init_mm.end_data = (unsigned long)_edata;
273         init_mm.brk = (unsigned long)_end;
274 
275 #ifdef CONFIG_BLK_DEV_INITRD
276         initrd_start = (unsigned long)&__initrd_start;
277         initrd_end = (unsigned long)&__initrd_end;
278         if (initrd_start == initrd_end) {
279                 initrd_start = 0;
280                 initrd_end = 0;
281         }
282         initrd_below_start_ok = 1;
283 #endif
284 
285         /* setup memblock allocator */
286         setup_memory();
287 
288         /* paging_init() sets up the MMU and marks all pages as reserved */
289         paging_init();
290 
291 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
292         if (!conswitchp)
293                 conswitchp = &dummy_con;
294 #endif
295 
296         *cmdline_p = boot_command_line;
297 
298         printk(KERN_INFO "OpenRISC Linux -- http://openrisc.io\n");
299 }
300 
301 static int show_cpuinfo(struct seq_file *m, void *v)
302 {
303         unsigned long vr;
304         int version, revision;
305 
306         vr = mfspr(SPR_VR);
307         version = (vr & SPR_VR_VER) >> 24;
308         revision = vr & SPR_VR_REV;
309 
310         seq_printf(m,
311                    "cpu\t\t: OpenRISC-%x\n"
312                    "revision\t: %d\n"
313                    "frequency\t: %ld\n"
314                    "dcache size\t: %d bytes\n"
315                    "dcache block size\t: %d bytes\n"
316                    "icache size\t: %d bytes\n"
317                    "icache block size\t: %d bytes\n"
318                    "immu\t\t: %d entries, %lu ways\n"
319                    "dmmu\t\t: %d entries, %lu ways\n"
320                    "bogomips\t: %lu.%02lu\n",
321                    version,
322                    revision,
323                    loops_per_jiffy * HZ,
324                    cpuinfo.dcache_size,
325                    cpuinfo.dcache_block_size,
326                    cpuinfo.icache_size,
327                    cpuinfo.icache_block_size,
328                    1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
329                    1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW),
330                    1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
331                    1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW),
332                    (loops_per_jiffy * HZ) / 500000,
333                    ((loops_per_jiffy * HZ) / 5000) % 100);
334 
335         return 0;
336 }
337 
338 static void *c_start(struct seq_file *m, loff_t * pos)
339 {
340         /* We only have one CPU... */
341         return *pos < 1 ? (void *)1 : NULL;
342 }
343 
344 static void *c_next(struct seq_file *m, void *v, loff_t * pos)
345 {
346         ++*pos;
347         return NULL;
348 }
349 
350 static void c_stop(struct seq_file *m, void *v)
351 {
352 }
353 
354 const struct seq_operations cpuinfo_op = {
355         .start = c_start,
356         .next = c_next,
357         .stop = c_stop,
358         .show = show_cpuinfo,
359 };
360 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp