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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * OpenRISC setup.c
4 *
5 * Linux architectural port borrowing liberally from similar works of
6 * others. All original copyrights apply as per the original source
7 * declaration.
8 *
9 * Modifications for the OpenRISC architecture:
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
12 *
13 * This file handles the architecture-dependent parts of initialization
14 */
15
16#include <linux/errno.h>
17#include <linux/sched.h>
18#include <linux/kernel.h>
19#include <linux/mm.h>
20#include <linux/stddef.h>
21#include <linux/unistd.h>
22#include <linux/ptrace.h>
23#include <linux/slab.h>
24#include <linux/tty.h>
25#include <linux/ioport.h>
26#include <linux/delay.h>
27#include <linux/console.h>
28#include <linux/init.h>
29#include <linux/memblock.h>
30#include <linux/seq_file.h>
31#include <linux/serial.h>
32#include <linux/initrd.h>
33#include <linux/of_fdt.h>
34#include <linux/of.h>
35#include <linux/device.h>
36
37#include <asm/sections.h>
38#include <asm/types.h>
39#include <asm/setup.h>
40#include <asm/io.h>
41#include <asm/cpuinfo.h>
42#include <asm/delay.h>
43
44#include "vmlinux.h"
45
46static void __init setup_memory(void)
47{
48 unsigned long ram_start_pfn;
49 unsigned long ram_end_pfn;
50 phys_addr_t memory_start, memory_end;
51 struct memblock_region *region;
52
53 memory_end = memory_start = 0;
54
55 /* Find main memory where is the kernel, we assume its the only one */
56 for_each_memblock(memory, region) {
57 memory_start = region->base;
58 memory_end = region->base + region->size;
59 printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__,
60 memory_start, memory_end);
61 }
62
63 if (!memory_end) {
64 panic("No memory!");
65 }
66
67 ram_start_pfn = PFN_UP(memory_start);
68 ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
69
70 /* setup bootmem globals (we use no_bootmem, but mm still depends on this) */
71 min_low_pfn = ram_start_pfn;
72 max_low_pfn = ram_end_pfn;
73 max_pfn = ram_end_pfn;
74
75 /*
76 * initialize the boot-time allocator (with low memory only).
77 *
78 * This makes the memory from the end of the kernel to the end of
79 * RAM usable.
80 */
81 memblock_reserve(__pa(_stext), _end - _stext);
82
83#ifdef CONFIG_BLK_DEV_INITRD
84 /* Then reserve the initrd, if any */
85 if (initrd_start && (initrd_end > initrd_start)) {
86 unsigned long aligned_start = ALIGN_DOWN(initrd_start, PAGE_SIZE);
87 unsigned long aligned_end = ALIGN(initrd_end, PAGE_SIZE);
88
89 memblock_reserve(__pa(aligned_start), aligned_end - aligned_start);
90 }
91#endif /* CONFIG_BLK_DEV_INITRD */
92
93 early_init_fdt_reserve_self();
94 early_init_fdt_scan_reserved_mem();
95
96 memblock_dump_all();
97}
98
99struct cpuinfo_or1k cpuinfo_or1k[NR_CPUS];
100
101static void print_cpuinfo(void)
102{
103 unsigned long upr = mfspr(SPR_UPR);
104 unsigned long vr = mfspr(SPR_VR);
105 unsigned int version;
106 unsigned int revision;
107 struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
108
109 version = (vr & SPR_VR_VER) >> 24;
110 revision = (vr & SPR_VR_REV);
111
112 printk(KERN_INFO "CPU: OpenRISC-%x (revision %d) @%d MHz\n",
113 version, revision, cpuinfo->clock_frequency / 1000000);
114
115 if (!(upr & SPR_UPR_UP)) {
116 printk(KERN_INFO
117 "-- no UPR register... unable to detect configuration\n");
118 return;
119 }
120
121 if (upr & SPR_UPR_DCP)
122 printk(KERN_INFO
123 "-- dcache: %4d bytes total, %2d bytes/line, %d way(s)\n",
124 cpuinfo->dcache_size, cpuinfo->dcache_block_size,
125 cpuinfo->dcache_ways);
126 else
127 printk(KERN_INFO "-- dcache disabled\n");
128 if (upr & SPR_UPR_ICP)
129 printk(KERN_INFO
130 "-- icache: %4d bytes total, %2d bytes/line, %d way(s)\n",
131 cpuinfo->icache_size, cpuinfo->icache_block_size,
132 cpuinfo->icache_ways);
133 else
134 printk(KERN_INFO "-- icache disabled\n");
135
136 if (upr & SPR_UPR_DMP)
137 printk(KERN_INFO "-- dmmu: %4d entries, %lu way(s)\n",
138 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
139 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
140 if (upr & SPR_UPR_IMP)
141 printk(KERN_INFO "-- immu: %4d entries, %lu way(s)\n",
142 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
143 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
144
145 printk(KERN_INFO "-- additional features:\n");
146 if (upr & SPR_UPR_DUP)
147 printk(KERN_INFO "-- debug unit\n");
148 if (upr & SPR_UPR_PCUP)
149 printk(KERN_INFO "-- performance counters\n");
150 if (upr & SPR_UPR_PMP)
151 printk(KERN_INFO "-- power management\n");
152 if (upr & SPR_UPR_PICP)
153 printk(KERN_INFO "-- PIC\n");
154 if (upr & SPR_UPR_TTP)
155 printk(KERN_INFO "-- timer\n");
156 if (upr & SPR_UPR_CUP)
157 printk(KERN_INFO "-- custom unit(s)\n");
158}
159
160static struct device_node *setup_find_cpu_node(int cpu)
161{
162 u32 hwid;
163 struct device_node *cpun;
164
165 for_each_of_cpu_node(cpun) {
166 if (of_property_read_u32(cpun, "reg", &hwid))
167 continue;
168 if (hwid == cpu)
169 return cpun;
170 }
171
172 return NULL;
173}
174
175void __init setup_cpuinfo(void)
176{
177 struct device_node *cpu;
178 unsigned long iccfgr, dccfgr;
179 unsigned long cache_set_size;
180 int cpu_id = smp_processor_id();
181 struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[cpu_id];
182
183 cpu = setup_find_cpu_node(cpu_id);
184 if (!cpu)
185 panic("Couldn't find CPU%d in device tree...\n", cpu_id);
186
187 iccfgr = mfspr(SPR_ICCFGR);
188 cpuinfo->icache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
189 cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3);
190 cpuinfo->icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7);
191 cpuinfo->icache_size =
192 cache_set_size * cpuinfo->icache_ways * cpuinfo->icache_block_size;
193
194 dccfgr = mfspr(SPR_DCCFGR);
195 cpuinfo->dcache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
196 cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
197 cpuinfo->dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7);
198 cpuinfo->dcache_size =
199 cache_set_size * cpuinfo->dcache_ways * cpuinfo->dcache_block_size;
200
201 if (of_property_read_u32(cpu, "clock-frequency",
202 &cpuinfo->clock_frequency)) {
203 printk(KERN_WARNING
204 "Device tree missing CPU 'clock-frequency' parameter."
205 "Assuming frequency 25MHZ"
206 "This is probably not what you want.");
207 }
208
209 cpuinfo->coreid = mfspr(SPR_COREID);
210
211 of_node_put(cpu);
212
213 print_cpuinfo();
214}
215
216/**
217 * or32_early_setup
218 *
219 * Handles the pointer to the device tree that this kernel is to use
220 * for establishing the available platform devices.
221 *
222 * Falls back on built-in device tree in case null pointer is passed.
223 */
224
225void __init or32_early_setup(void *fdt)
226{
227 if (fdt)
228 pr_info("FDT at %p\n", fdt);
229 else {
230 fdt = __dtb_start;
231 pr_info("Compiled-in FDT at %p\n", fdt);
232 }
233 early_init_devtree(fdt);
234}
235
236static inline unsigned long extract_value_bits(unsigned long reg,
237 short bit_nr, short width)
238{
239 return (reg >> bit_nr) & (0 << width);
240}
241
242static inline unsigned long extract_value(unsigned long reg, unsigned long mask)
243{
244 while (!(mask & 0x1)) {
245 reg = reg >> 1;
246 mask = mask >> 1;
247 }
248 return mask & reg;
249}
250
251void __init detect_unit_config(unsigned long upr, unsigned long mask,
252 char *text, void (*func) (void))
253{
254 if (text != NULL)
255 printk("%s", text);
256
257 if (upr & mask) {
258 if (func != NULL)
259 func();
260 else
261 printk("present\n");
262 } else
263 printk("not present\n");
264}
265
266/*
267 * calibrate_delay
268 *
269 * Lightweight calibrate_delay implementation that calculates loops_per_jiffy
270 * from the clock frequency passed in via the device tree
271 *
272 */
273
274void calibrate_delay(void)
275{
276 const int *val;
277 struct device_node *cpu = setup_find_cpu_node(smp_processor_id());
278
279 val = of_get_property(cpu, "clock-frequency", NULL);
280 if (!val)
281 panic("no cpu 'clock-frequency' parameter in device tree");
282 loops_per_jiffy = *val / HZ;
283 pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
284 loops_per_jiffy / (500000 / HZ),
285 (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
286}
287
288void __init setup_arch(char **cmdline_p)
289{
290 unflatten_and_copy_device_tree();
291
292 setup_cpuinfo();
293
294#ifdef CONFIG_SMP
295 smp_init_cpus();
296#endif
297
298 /* process 1's initial memory region is the kernel code/data */
299 init_mm.start_code = (unsigned long)_stext;
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#ifdef CONFIG_BLK_DEV_INITRD
305 if (initrd_start == initrd_end) {
306 printk(KERN_INFO "Initial ramdisk not found\n");
307 initrd_start = 0;
308 initrd_end = 0;
309 } else {
310 printk(KERN_INFO "Initial ramdisk at: 0x%p (%lu bytes)\n",
311 (void *)(initrd_start), initrd_end - initrd_start);
312 initrd_below_start_ok = 1;
313 }
314#endif
315
316 /* setup memblock allocator */
317 setup_memory();
318
319 /* paging_init() sets up the MMU and marks all pages as reserved */
320 paging_init();
321
322 *cmdline_p = boot_command_line;
323
324 printk(KERN_INFO "OpenRISC Linux -- http://openrisc.io\n");
325}
326
327static int show_cpuinfo(struct seq_file *m, void *v)
328{
329 unsigned int vr, cpucfgr;
330 unsigned int avr;
331 unsigned int version;
332 struct cpuinfo_or1k *cpuinfo = v;
333
334 vr = mfspr(SPR_VR);
335 cpucfgr = mfspr(SPR_CPUCFGR);
336
337#ifdef CONFIG_SMP
338 seq_printf(m, "processor\t\t: %d\n", cpuinfo->coreid);
339#endif
340 if (vr & SPR_VR_UVRP) {
341 vr = mfspr(SPR_VR2);
342 version = vr & SPR_VR2_VER;
343 avr = mfspr(SPR_AVR);
344 seq_printf(m, "cpu architecture\t: "
345 "OpenRISC 1000 (%d.%d-rev%d)\n",
346 (avr >> 24) & 0xff,
347 (avr >> 16) & 0xff,
348 (avr >> 8) & 0xff);
349 seq_printf(m, "cpu implementation id\t: 0x%x\n",
350 (vr & SPR_VR2_CPUID) >> 24);
351 seq_printf(m, "cpu version\t\t: 0x%x\n", version);
352 } else {
353 version = (vr & SPR_VR_VER) >> 24;
354 seq_printf(m, "cpu\t\t\t: OpenRISC-%x\n", version);
355 seq_printf(m, "revision\t\t: %d\n", vr & SPR_VR_REV);
356 }
357 seq_printf(m, "frequency\t\t: %ld\n", loops_per_jiffy * HZ);
358 seq_printf(m, "dcache size\t\t: %d bytes\n", cpuinfo->dcache_size);
359 seq_printf(m, "dcache block size\t: %d bytes\n",
360 cpuinfo->dcache_block_size);
361 seq_printf(m, "dcache ways\t\t: %d\n", cpuinfo->dcache_ways);
362 seq_printf(m, "icache size\t\t: %d bytes\n", cpuinfo->icache_size);
363 seq_printf(m, "icache block size\t: %d bytes\n",
364 cpuinfo->icache_block_size);
365 seq_printf(m, "icache ways\t\t: %d\n", cpuinfo->icache_ways);
366 seq_printf(m, "immu\t\t\t: %d entries, %lu ways\n",
367 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
368 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
369 seq_printf(m, "dmmu\t\t\t: %d entries, %lu ways\n",
370 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
371 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
372 seq_printf(m, "bogomips\t\t: %lu.%02lu\n",
373 (loops_per_jiffy * HZ) / 500000,
374 ((loops_per_jiffy * HZ) / 5000) % 100);
375
376 seq_puts(m, "features\t\t: ");
377 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB32S ? "orbis32" : "");
378 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB64S ? "orbis64" : "");
379 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF32S ? "orfpx32" : "");
380 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF64S ? "orfpx64" : "");
381 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OV64S ? "orvdx64" : "");
382 seq_puts(m, "\n");
383
384 seq_puts(m, "\n");
385
386 return 0;
387}
388
389static void *c_start(struct seq_file *m, loff_t *pos)
390{
391 *pos = cpumask_next(*pos - 1, cpu_online_mask);
392 if ((*pos) < nr_cpu_ids)
393 return &cpuinfo_or1k[*pos];
394 return NULL;
395}
396
397static void *c_next(struct seq_file *m, void *v, loff_t *pos)
398{
399 (*pos)++;
400 return c_start(m, pos);
401}
402
403static void c_stop(struct seq_file *m, void *v)
404{
405}
406
407const struct seq_operations cpuinfo_op = {
408 .start = c_start,
409 .next = c_next,
410 .stop = c_stop,
411 .show = show_cpuinfo,
412};
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#include <linux/of_platform.h>
42
43#include <asm/sections.h>
44#include <asm/segment.h>
45#include <asm/pgtable.h>
46#include <asm/types.h>
47#include <asm/setup.h>
48#include <asm/io.h>
49#include <asm/cpuinfo.h>
50#include <asm/delay.h>
51
52#include "vmlinux.h"
53
54static unsigned long __init setup_memory(void)
55{
56 unsigned long bootmap_size;
57 unsigned long ram_start_pfn;
58 unsigned long free_ram_start_pfn;
59 unsigned long ram_end_pfn;
60 phys_addr_t memory_start, memory_end;
61 struct memblock_region *region;
62
63 memory_end = memory_start = 0;
64
65 /* Find main memory where is the kernel */
66 for_each_memblock(memory, region) {
67 memory_start = region->base;
68 memory_end = region->base + region->size;
69 printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__,
70 memory_start, memory_end);
71 }
72
73 if (!memory_end) {
74 panic("No memory!");
75 }
76
77 ram_start_pfn = PFN_UP(memory_start);
78 /* free_ram_start_pfn is first page after kernel */
79 free_ram_start_pfn = PFN_UP(__pa(_end));
80 ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
81
82 max_pfn = ram_end_pfn;
83
84 /*
85 * initialize the boot-time allocator (with low memory only).
86 *
87 * This makes the memory from the end of the kernel to the end of
88 * RAM usable.
89 * init_bootmem sets the global values min_low_pfn, max_low_pfn.
90 */
91 bootmap_size = init_bootmem(free_ram_start_pfn,
92 ram_end_pfn - ram_start_pfn);
93 free_bootmem(PFN_PHYS(free_ram_start_pfn),
94 (ram_end_pfn - free_ram_start_pfn) << PAGE_SHIFT);
95 reserve_bootmem(PFN_PHYS(free_ram_start_pfn), bootmap_size,
96 BOOTMEM_DEFAULT);
97
98 for_each_memblock(reserved, region) {
99 printk(KERN_INFO "Reserved - 0x%08x-0x%08x\n",
100 (u32) region->base, (u32) region->size);
101 reserve_bootmem(region->base, region->size, BOOTMEM_DEFAULT);
102 }
103
104 return ram_end_pfn;
105}
106
107struct cpuinfo cpuinfo;
108
109static void print_cpuinfo(void)
110{
111 unsigned long upr = mfspr(SPR_UPR);
112 unsigned long vr = mfspr(SPR_VR);
113 unsigned int version;
114 unsigned int revision;
115
116 version = (vr & SPR_VR_VER) >> 24;
117 revision = (vr & SPR_VR_REV);
118
119 printk(KERN_INFO "CPU: OpenRISC-%x (revision %d) @%d MHz\n",
120 version, revision, cpuinfo.clock_frequency / 1000000);
121
122 if (!(upr & SPR_UPR_UP)) {
123 printk(KERN_INFO
124 "-- no UPR register... unable to detect configuration\n");
125 return;
126 }
127
128 if (upr & SPR_UPR_DCP)
129 printk(KERN_INFO
130 "-- dcache: %4d bytes total, %2d bytes/line, %d way(s)\n",
131 cpuinfo.dcache_size, cpuinfo.dcache_block_size, 1);
132 else
133 printk(KERN_INFO "-- dcache disabled\n");
134 if (upr & SPR_UPR_ICP)
135 printk(KERN_INFO
136 "-- icache: %4d bytes total, %2d bytes/line, %d way(s)\n",
137 cpuinfo.icache_size, cpuinfo.icache_block_size, 1);
138 else
139 printk(KERN_INFO "-- icache disabled\n");
140
141 if (upr & SPR_UPR_DMP)
142 printk(KERN_INFO "-- dmmu: %4d entries, %lu way(s)\n",
143 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
144 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
145 if (upr & SPR_UPR_IMP)
146 printk(KERN_INFO "-- immu: %4d entries, %lu way(s)\n",
147 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
148 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
149
150 printk(KERN_INFO "-- additional features:\n");
151 if (upr & SPR_UPR_DUP)
152 printk(KERN_INFO "-- debug unit\n");
153 if (upr & SPR_UPR_PCUP)
154 printk(KERN_INFO "-- performance counters\n");
155 if (upr & SPR_UPR_PMP)
156 printk(KERN_INFO "-- power management\n");
157 if (upr & SPR_UPR_PICP)
158 printk(KERN_INFO "-- PIC\n");
159 if (upr & SPR_UPR_TTP)
160 printk(KERN_INFO "-- timer\n");
161 if (upr & SPR_UPR_CUP)
162 printk(KERN_INFO "-- custom unit(s)\n");
163}
164
165void __init setup_cpuinfo(void)
166{
167 struct device_node *cpu;
168 unsigned long iccfgr, dccfgr;
169 unsigned long cache_set_size, cache_ways;
170
171 cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481");
172 if (!cpu)
173 panic("No compatible CPU found in device tree...\n");
174
175 iccfgr = mfspr(SPR_ICCFGR);
176 cache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
177 cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3);
178 cpuinfo.icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7);
179 cpuinfo.icache_size =
180 cache_set_size * cache_ways * cpuinfo.icache_block_size;
181
182 dccfgr = mfspr(SPR_DCCFGR);
183 cache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
184 cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
185 cpuinfo.dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7);
186 cpuinfo.dcache_size =
187 cache_set_size * cache_ways * cpuinfo.dcache_block_size;
188
189 if (of_property_read_u32(cpu, "clock-frequency",
190 &cpuinfo.clock_frequency)) {
191 printk(KERN_WARNING
192 "Device tree missing CPU 'clock-frequency' parameter."
193 "Assuming frequency 25MHZ"
194 "This is probably not what you want.");
195 }
196
197 of_node_put(cpu);
198
199 print_cpuinfo();
200}
201
202/**
203 * or32_early_setup
204 *
205 * Handles the pointer to the device tree that this kernel is to use
206 * for establishing the available platform devices.
207 *
208 * Falls back on built-in device tree in case null pointer is passed.
209 */
210
211void __init or32_early_setup(void *fdt)
212{
213 if (fdt)
214 pr_info("FDT at %p\n", fdt);
215 else {
216 fdt = __dtb_start;
217 pr_info("Compiled-in FDT at %p\n", fdt);
218 }
219 early_init_devtree(fdt);
220}
221
222static int __init openrisc_device_probe(void)
223{
224 of_platform_populate(NULL, NULL, NULL, NULL);
225
226 return 0;
227}
228
229device_initcall(openrisc_device_probe);
230
231static inline unsigned long extract_value_bits(unsigned long reg,
232 short bit_nr, short width)
233{
234 return (reg >> bit_nr) & (0 << width);
235}
236
237static inline unsigned long extract_value(unsigned long reg, unsigned long mask)
238{
239 while (!(mask & 0x1)) {
240 reg = reg >> 1;
241 mask = mask >> 1;
242 }
243 return mask & reg;
244}
245
246void __init detect_unit_config(unsigned long upr, unsigned long mask,
247 char *text, void (*func) (void))
248{
249 if (text != NULL)
250 printk("%s", text);
251
252 if (upr & mask) {
253 if (func != NULL)
254 func();
255 else
256 printk("present\n");
257 } else
258 printk("not present\n");
259}
260
261/*
262 * calibrate_delay
263 *
264 * Lightweight calibrate_delay implementation that calculates loops_per_jiffy
265 * from the clock frequency passed in via the device tree
266 *
267 */
268
269void calibrate_delay(void)
270{
271 const int *val;
272 struct device_node *cpu = NULL;
273 cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481");
274 val = of_get_property(cpu, "clock-frequency", NULL);
275 if (!val)
276 panic("no cpu 'clock-frequency' parameter in device tree");
277 loops_per_jiffy = *val / HZ;
278 pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
279 loops_per_jiffy / (500000 / HZ),
280 (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
281}
282
283void __init setup_arch(char **cmdline_p)
284{
285 unsigned long max_low_pfn;
286
287 unflatten_and_copy_device_tree();
288
289 setup_cpuinfo();
290
291 /* process 1's initial memory region is the kernel code/data */
292 init_mm.start_code = (unsigned long)_stext;
293 init_mm.end_code = (unsigned long)_etext;
294 init_mm.end_data = (unsigned long)_edata;
295 init_mm.brk = (unsigned long)_end;
296
297#ifdef CONFIG_BLK_DEV_INITRD
298 initrd_start = (unsigned long)&__initrd_start;
299 initrd_end = (unsigned long)&__initrd_end;
300 if (initrd_start == initrd_end) {
301 initrd_start = 0;
302 initrd_end = 0;
303 }
304 initrd_below_start_ok = 1;
305#endif
306
307 /* setup bootmem allocator */
308 max_low_pfn = setup_memory();
309
310 /* paging_init() sets up the MMU and marks all pages as reserved */
311 paging_init();
312
313#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
314 if (!conswitchp)
315 conswitchp = &dummy_con;
316#endif
317
318 *cmdline_p = boot_command_line;
319
320 printk(KERN_INFO "OpenRISC Linux -- http://openrisc.net\n");
321}
322
323static int show_cpuinfo(struct seq_file *m, void *v)
324{
325 unsigned long vr;
326 int version, revision;
327
328 vr = mfspr(SPR_VR);
329 version = (vr & SPR_VR_VER) >> 24;
330 revision = vr & SPR_VR_REV;
331
332 return seq_printf(m,
333 "cpu\t\t: OpenRISC-%x\n"
334 "revision\t: %d\n"
335 "frequency\t: %ld\n"
336 "dcache size\t: %d bytes\n"
337 "dcache block size\t: %d bytes\n"
338 "icache size\t: %d bytes\n"
339 "icache block size\t: %d bytes\n"
340 "immu\t\t: %d entries, %lu ways\n"
341 "dmmu\t\t: %d entries, %lu ways\n"
342 "bogomips\t: %lu.%02lu\n",
343 version,
344 revision,
345 loops_per_jiffy * HZ,
346 cpuinfo.dcache_size,
347 cpuinfo.dcache_block_size,
348 cpuinfo.icache_size,
349 cpuinfo.icache_block_size,
350 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
351 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW),
352 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
353 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW),
354 (loops_per_jiffy * HZ) / 500000,
355 ((loops_per_jiffy * HZ) / 5000) % 100);
356}
357
358static void *c_start(struct seq_file *m, loff_t * pos)
359{
360 /* We only have one CPU... */
361 return *pos < 1 ? (void *)1 : NULL;
362}
363
364static void *c_next(struct seq_file *m, void *v, loff_t * pos)
365{
366 ++*pos;
367 return NULL;
368}
369
370static void c_stop(struct seq_file *m, void *v)
371{
372}
373
374const struct seq_operations cpuinfo_op = {
375 .start = c_start,
376 .next = c_next,
377 .stop = c_stop,
378 .show = show_cpuinfo,
379};