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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
53static 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
96struct cpuinfo_or1k cpuinfo_or1k[NR_CPUS];
97
98static 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 struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
105
106 version = (vr & SPR_VR_VER) >> 24;
107 revision = (vr & SPR_VR_REV);
108
109 printk(KERN_INFO "CPU: OpenRISC-%x (revision %d) @%d MHz\n",
110 version, revision, cpuinfo->clock_frequency / 1000000);
111
112 if (!(upr & SPR_UPR_UP)) {
113 printk(KERN_INFO
114 "-- no UPR register... unable to detect configuration\n");
115 return;
116 }
117
118 if (upr & SPR_UPR_DCP)
119 printk(KERN_INFO
120 "-- dcache: %4d bytes total, %2d bytes/line, %d way(s)\n",
121 cpuinfo->dcache_size, cpuinfo->dcache_block_size,
122 cpuinfo->dcache_ways);
123 else
124 printk(KERN_INFO "-- dcache disabled\n");
125 if (upr & SPR_UPR_ICP)
126 printk(KERN_INFO
127 "-- icache: %4d bytes total, %2d bytes/line, %d way(s)\n",
128 cpuinfo->icache_size, cpuinfo->icache_block_size,
129 cpuinfo->icache_ways);
130 else
131 printk(KERN_INFO "-- icache disabled\n");
132
133 if (upr & SPR_UPR_DMP)
134 printk(KERN_INFO "-- dmmu: %4d entries, %lu way(s)\n",
135 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
136 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
137 if (upr & SPR_UPR_IMP)
138 printk(KERN_INFO "-- immu: %4d entries, %lu way(s)\n",
139 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
140 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
141
142 printk(KERN_INFO "-- additional features:\n");
143 if (upr & SPR_UPR_DUP)
144 printk(KERN_INFO "-- debug unit\n");
145 if (upr & SPR_UPR_PCUP)
146 printk(KERN_INFO "-- performance counters\n");
147 if (upr & SPR_UPR_PMP)
148 printk(KERN_INFO "-- power management\n");
149 if (upr & SPR_UPR_PICP)
150 printk(KERN_INFO "-- PIC\n");
151 if (upr & SPR_UPR_TTP)
152 printk(KERN_INFO "-- timer\n");
153 if (upr & SPR_UPR_CUP)
154 printk(KERN_INFO "-- custom unit(s)\n");
155}
156
157static struct device_node *setup_find_cpu_node(int cpu)
158{
159 u32 hwid;
160 struct device_node *cpun;
161 struct device_node *cpus = of_find_node_by_path("/cpus");
162
163 for_each_available_child_of_node(cpus, cpun) {
164 if (of_property_read_u32(cpun, "reg", &hwid))
165 continue;
166 if (hwid == cpu)
167 return cpun;
168 }
169
170 return NULL;
171}
172
173void __init setup_cpuinfo(void)
174{
175 struct device_node *cpu;
176 unsigned long iccfgr, dccfgr;
177 unsigned long cache_set_size;
178 int cpu_id = smp_processor_id();
179 struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[cpu_id];
180
181 cpu = setup_find_cpu_node(cpu_id);
182 if (!cpu)
183 panic("Couldn't find CPU%d in device tree...\n", cpu_id);
184
185 iccfgr = mfspr(SPR_ICCFGR);
186 cpuinfo->icache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
187 cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3);
188 cpuinfo->icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7);
189 cpuinfo->icache_size =
190 cache_set_size * cpuinfo->icache_ways * cpuinfo->icache_block_size;
191
192 dccfgr = mfspr(SPR_DCCFGR);
193 cpuinfo->dcache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
194 cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
195 cpuinfo->dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7);
196 cpuinfo->dcache_size =
197 cache_set_size * cpuinfo->dcache_ways * cpuinfo->dcache_block_size;
198
199 if (of_property_read_u32(cpu, "clock-frequency",
200 &cpuinfo->clock_frequency)) {
201 printk(KERN_WARNING
202 "Device tree missing CPU 'clock-frequency' parameter."
203 "Assuming frequency 25MHZ"
204 "This is probably not what you want.");
205 }
206
207 cpuinfo->coreid = mfspr(SPR_COREID);
208
209 of_node_put(cpu);
210
211 print_cpuinfo();
212}
213
214/**
215 * or32_early_setup
216 *
217 * Handles the pointer to the device tree that this kernel is to use
218 * for establishing the available platform devices.
219 *
220 * Falls back on built-in device tree in case null pointer is passed.
221 */
222
223void __init or32_early_setup(void *fdt)
224{
225 if (fdt)
226 pr_info("FDT at %p\n", fdt);
227 else {
228 fdt = __dtb_start;
229 pr_info("Compiled-in FDT at %p\n", fdt);
230 }
231 early_init_devtree(fdt);
232}
233
234static inline unsigned long extract_value_bits(unsigned long reg,
235 short bit_nr, short width)
236{
237 return (reg >> bit_nr) & (0 << width);
238}
239
240static inline unsigned long extract_value(unsigned long reg, unsigned long mask)
241{
242 while (!(mask & 0x1)) {
243 reg = reg >> 1;
244 mask = mask >> 1;
245 }
246 return mask & reg;
247}
248
249void __init detect_unit_config(unsigned long upr, unsigned long mask,
250 char *text, void (*func) (void))
251{
252 if (text != NULL)
253 printk("%s", text);
254
255 if (upr & mask) {
256 if (func != NULL)
257 func();
258 else
259 printk("present\n");
260 } else
261 printk("not present\n");
262}
263
264/*
265 * calibrate_delay
266 *
267 * Lightweight calibrate_delay implementation that calculates loops_per_jiffy
268 * from the clock frequency passed in via the device tree
269 *
270 */
271
272void calibrate_delay(void)
273{
274 const int *val;
275 struct device_node *cpu = setup_find_cpu_node(smp_processor_id());
276
277 val = of_get_property(cpu, "clock-frequency", NULL);
278 if (!val)
279 panic("no cpu 'clock-frequency' parameter in device tree");
280 loops_per_jiffy = *val / HZ;
281 pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
282 loops_per_jiffy / (500000 / HZ),
283 (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
284}
285
286void __init setup_arch(char **cmdline_p)
287{
288 unflatten_and_copy_device_tree();
289
290 setup_cpuinfo();
291
292#ifdef CONFIG_SMP
293 smp_init_cpus();
294#endif
295
296 /* process 1's initial memory region is the kernel code/data */
297 init_mm.start_code = (unsigned long)_stext;
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#ifdef CONFIG_BLK_DEV_INITRD
303 initrd_start = (unsigned long)&__initrd_start;
304 initrd_end = (unsigned long)&__initrd_end;
305 if (initrd_start == initrd_end) {
306 initrd_start = 0;
307 initrd_end = 0;
308 }
309 initrd_below_start_ok = 1;
310#endif
311
312 /* setup memblock allocator */
313 setup_memory();
314
315 /* paging_init() sets up the MMU and marks all pages as reserved */
316 paging_init();
317
318#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
319 if (!conswitchp)
320 conswitchp = &dummy_con;
321#endif
322
323 *cmdline_p = boot_command_line;
324
325 printk(KERN_INFO "OpenRISC Linux -- http://openrisc.io\n");
326}
327
328static int show_cpuinfo(struct seq_file *m, void *v)
329{
330 unsigned int vr, cpucfgr;
331 unsigned int avr;
332 unsigned int version;
333 struct cpuinfo_or1k *cpuinfo = v;
334
335 vr = mfspr(SPR_VR);
336 cpucfgr = mfspr(SPR_CPUCFGR);
337
338#ifdef CONFIG_SMP
339 seq_printf(m, "processor\t\t: %d\n", cpuinfo->coreid);
340#endif
341 if (vr & SPR_VR_UVRP) {
342 vr = mfspr(SPR_VR2);
343 version = vr & SPR_VR2_VER;
344 avr = mfspr(SPR_AVR);
345 seq_printf(m, "cpu architecture\t: "
346 "OpenRISC 1000 (%d.%d-rev%d)\n",
347 (avr >> 24) & 0xff,
348 (avr >> 16) & 0xff,
349 (avr >> 8) & 0xff);
350 seq_printf(m, "cpu implementation id\t: 0x%x\n",
351 (vr & SPR_VR2_CPUID) >> 24);
352 seq_printf(m, "cpu version\t\t: 0x%x\n", version);
353 } else {
354 version = (vr & SPR_VR_VER) >> 24;
355 seq_printf(m, "cpu\t\t\t: OpenRISC-%x\n", version);
356 seq_printf(m, "revision\t\t: %d\n", vr & SPR_VR_REV);
357 }
358 seq_printf(m, "frequency\t\t: %ld\n", loops_per_jiffy * HZ);
359 seq_printf(m, "dcache size\t\t: %d bytes\n", cpuinfo->dcache_size);
360 seq_printf(m, "dcache block size\t: %d bytes\n",
361 cpuinfo->dcache_block_size);
362 seq_printf(m, "dcache ways\t\t: %d\n", cpuinfo->dcache_ways);
363 seq_printf(m, "icache size\t\t: %d bytes\n", cpuinfo->icache_size);
364 seq_printf(m, "icache block size\t: %d bytes\n",
365 cpuinfo->icache_block_size);
366 seq_printf(m, "icache ways\t\t: %d\n", cpuinfo->icache_ways);
367 seq_printf(m, "immu\t\t\t: %d entries, %lu ways\n",
368 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
369 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
370 seq_printf(m, "dmmu\t\t\t: %d entries, %lu ways\n",
371 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
372 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
373 seq_printf(m, "bogomips\t\t: %lu.%02lu\n",
374 (loops_per_jiffy * HZ) / 500000,
375 ((loops_per_jiffy * HZ) / 5000) % 100);
376
377 seq_puts(m, "features\t\t: ");
378 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB32S ? "orbis32" : "");
379 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB64S ? "orbis64" : "");
380 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF32S ? "orfpx32" : "");
381 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF64S ? "orfpx64" : "");
382 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OV64S ? "orvdx64" : "");
383 seq_puts(m, "\n");
384
385 seq_puts(m, "\n");
386
387 return 0;
388}
389
390static void *c_start(struct seq_file *m, loff_t *pos)
391{
392 *pos = cpumask_next(*pos - 1, cpu_online_mask);
393 if ((*pos) < nr_cpu_ids)
394 return &cpuinfo_or1k[*pos];
395 return NULL;
396}
397
398static void *c_next(struct seq_file *m, void *v, loff_t *pos)
399{
400 (*pos)++;
401 return c_start(m, pos);
402}
403
404static void c_stop(struct seq_file *m, void *v)
405{
406}
407
408const struct seq_operations cpuinfo_op = {
409 .start = c_start,
410 .next = c_next,
411 .stop = c_stop,
412 .show = show_cpuinfo,
413};
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/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
53char __initdata cmd_line[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
54
55static unsigned long __init setup_memory(void)
56{
57 unsigned long bootmap_size;
58 unsigned long ram_start_pfn;
59 unsigned long free_ram_start_pfn;
60 unsigned long ram_end_pfn;
61 phys_addr_t memory_start, memory_end;
62 struct memblock_region *region;
63
64 memory_end = memory_start = 0;
65
66 /* Find main memory where is the kernel */
67 for_each_memblock(memory, region) {
68 memory_start = region->base;
69 memory_end = region->base + region->size;
70 printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__,
71 memory_start, memory_end);
72 }
73
74 if (!memory_end) {
75 panic("No memory!");
76 }
77
78 ram_start_pfn = PFN_UP(memory_start);
79 /* free_ram_start_pfn is first page after kernel */
80 free_ram_start_pfn = PFN_UP(__pa(&_end));
81 ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
82
83 max_pfn = ram_end_pfn;
84
85 /*
86 * initialize the boot-time allocator (with low memory only).
87 *
88 * This makes the memory from the end of the kernel to the end of
89 * RAM usable.
90 * init_bootmem sets the global values min_low_pfn, max_low_pfn.
91 */
92 bootmap_size = init_bootmem(free_ram_start_pfn,
93 ram_end_pfn - ram_start_pfn);
94 free_bootmem(PFN_PHYS(free_ram_start_pfn),
95 (ram_end_pfn - free_ram_start_pfn) << PAGE_SHIFT);
96 reserve_bootmem(PFN_PHYS(free_ram_start_pfn), bootmap_size,
97 BOOTMEM_DEFAULT);
98
99 for_each_memblock(reserved, region) {
100 printk(KERN_INFO "Reserved - 0x%08x-0x%08x\n",
101 (u32) region->base, (u32) region->size);
102 reserve_bootmem(region->base, region->size, BOOTMEM_DEFAULT);
103 }
104
105 return ram_end_pfn;
106}
107
108struct cpuinfo cpuinfo;
109
110static void print_cpuinfo(void)
111{
112 unsigned long upr = mfspr(SPR_UPR);
113 unsigned long vr = mfspr(SPR_VR);
114 unsigned int version;
115 unsigned int revision;
116
117 version = (vr & SPR_VR_VER) >> 24;
118 revision = (vr & SPR_VR_REV);
119
120 printk(KERN_INFO "CPU: OpenRISC-%x (revision %d) @%d MHz\n",
121 version, revision, cpuinfo.clock_frequency / 1000000);
122
123 if (!(upr & SPR_UPR_UP)) {
124 printk(KERN_INFO
125 "-- no UPR register... unable to detect configuration\n");
126 return;
127 }
128
129 if (upr & SPR_UPR_DCP)
130 printk(KERN_INFO
131 "-- dcache: %4d bytes total, %2d bytes/line, %d way(s)\n",
132 cpuinfo.dcache_size, cpuinfo.dcache_block_size, 1);
133 else
134 printk(KERN_INFO "-- dcache disabled\n");
135 if (upr & SPR_UPR_ICP)
136 printk(KERN_INFO
137 "-- icache: %4d bytes total, %2d bytes/line, %d way(s)\n",
138 cpuinfo.icache_size, cpuinfo.icache_block_size, 1);
139 else
140 printk(KERN_INFO "-- icache disabled\n");
141
142 if (upr & SPR_UPR_DMP)
143 printk(KERN_INFO "-- dmmu: %4d entries, %lu way(s)\n",
144 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
145 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
146 if (upr & SPR_UPR_IMP)
147 printk(KERN_INFO "-- immu: %4d entries, %lu way(s)\n",
148 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
149 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
150
151 printk(KERN_INFO "-- additional features:\n");
152 if (upr & SPR_UPR_DUP)
153 printk(KERN_INFO "-- debug unit\n");
154 if (upr & SPR_UPR_PCUP)
155 printk(KERN_INFO "-- performance counters\n");
156 if (upr & SPR_UPR_PMP)
157 printk(KERN_INFO "-- power management\n");
158 if (upr & SPR_UPR_PICP)
159 printk(KERN_INFO "-- PIC\n");
160 if (upr & SPR_UPR_TTP)
161 printk(KERN_INFO "-- timer\n");
162 if (upr & SPR_UPR_CUP)
163 printk(KERN_INFO "-- custom unit(s)\n");
164}
165
166void __init setup_cpuinfo(void)
167{
168 struct device_node *cpu;
169 unsigned long iccfgr, dccfgr;
170 unsigned long cache_set_size, cache_ways;
171
172 cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481");
173 if (!cpu)
174 panic("No compatible CPU found in device tree...\n");
175
176 iccfgr = mfspr(SPR_ICCFGR);
177 cache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
178 cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3);
179 cpuinfo.icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7);
180 cpuinfo.icache_size =
181 cache_set_size * cache_ways * cpuinfo.icache_block_size;
182
183 dccfgr = mfspr(SPR_DCCFGR);
184 cache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
185 cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
186 cpuinfo.dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7);
187 cpuinfo.dcache_size =
188 cache_set_size * cache_ways * cpuinfo.dcache_block_size;
189
190 if (of_property_read_u32(cpu, "clock-frequency",
191 &cpuinfo.clock_frequency)) {
192 printk(KERN_WARNING
193 "Device tree missing CPU 'clock-frequency' parameter."
194 "Assuming frequency 25MHZ"
195 "This is probably not what you want.");
196 }
197
198 of_node_put(cpu);
199
200 print_cpuinfo();
201}
202
203/**
204 * or32_early_setup
205 *
206 * Handles the pointer to the device tree that this kernel is to use
207 * for establishing the available platform devices.
208 *
209 * Falls back on built-in device tree in case null pointer is passed.
210 */
211
212void __init or32_early_setup(unsigned int fdt)
213{
214 if (fdt) {
215 early_init_devtree((void*) fdt);
216 printk(KERN_INFO "FDT at 0x%08x\n", fdt);
217 } else {
218 early_init_devtree(__dtb_start);
219 printk(KERN_INFO "Compiled-in FDT at %p\n", __dtb_start);
220 }
221}
222
223static int __init openrisc_device_probe(void)
224{
225 of_platform_populate(NULL, NULL, NULL, NULL);
226
227 return 0;
228}
229
230device_initcall(openrisc_device_probe);
231
232static inline unsigned long extract_value_bits(unsigned long reg,
233 short bit_nr, short width)
234{
235 return (reg >> bit_nr) & (0 << width);
236}
237
238static inline unsigned long extract_value(unsigned long reg, unsigned long mask)
239{
240 while (!(mask & 0x1)) {
241 reg = reg >> 1;
242 mask = mask >> 1;
243 }
244 return mask & reg;
245}
246
247void __init detect_unit_config(unsigned long upr, unsigned long mask,
248 char *text, void (*func) (void))
249{
250 if (text != NULL)
251 printk("%s", text);
252
253 if (upr & mask) {
254 if (func != NULL)
255 func();
256 else
257 printk("present\n");
258 } else
259 printk("not present\n");
260}
261
262/*
263 * calibrate_delay
264 *
265 * Lightweight calibrate_delay implementation that calculates loops_per_jiffy
266 * from the clock frequency passed in via the device tree
267 *
268 */
269
270void __cpuinit calibrate_delay(void)
271{
272 const int *val;
273 struct device_node *cpu = NULL;
274 cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481");
275 val = of_get_property(cpu, "clock-frequency", NULL);
276 if (!val)
277 panic("no cpu 'clock-frequency' parameter in device tree");
278 loops_per_jiffy = *val / HZ;
279 pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
280 loops_per_jiffy / (500000 / HZ),
281 (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
282}
283
284void __init setup_arch(char **cmdline_p)
285{
286 unsigned long max_low_pfn;
287
288 unflatten_device_tree();
289
290 setup_cpuinfo();
291
292 /* process 1's initial memory region is the kernel code/data */
293 init_mm.start_code = (unsigned long)&_stext;
294 init_mm.end_code = (unsigned long)&_etext;
295 init_mm.end_data = (unsigned long)&_edata;
296 init_mm.brk = (unsigned long)&_end;
297
298#ifdef CONFIG_BLK_DEV_INITRD
299 initrd_start = (unsigned long)&__initrd_start;
300 initrd_end = (unsigned long)&__initrd_end;
301 if (initrd_start == initrd_end) {
302 initrd_start = 0;
303 initrd_end = 0;
304 }
305 initrd_below_start_ok = 1;
306#endif
307
308 /* setup bootmem allocator */
309 max_low_pfn = setup_memory();
310
311 /* paging_init() sets up the MMU and marks all pages as reserved */
312 paging_init();
313
314#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
315 if (!conswitchp)
316 conswitchp = &dummy_con;
317#endif
318
319 *cmdline_p = cmd_line;
320
321 printk(KERN_INFO "OpenRISC Linux -- http://openrisc.net\n");
322}
323
324static int show_cpuinfo(struct seq_file *m, void *v)
325{
326 unsigned long vr;
327 int version, revision;
328
329 vr = mfspr(SPR_VR);
330 version = (vr & SPR_VR_VER) >> 24;
331 revision = vr & SPR_VR_REV;
332
333 return seq_printf(m,
334 "cpu\t\t: OpenRISC-%x\n"
335 "revision\t: %d\n"
336 "frequency\t: %ld\n"
337 "dcache size\t: %d bytes\n"
338 "dcache block size\t: %d bytes\n"
339 "icache size\t: %d bytes\n"
340 "icache block size\t: %d bytes\n"
341 "immu\t\t: %d entries, %lu ways\n"
342 "dmmu\t\t: %d entries, %lu ways\n"
343 "bogomips\t: %lu.%02lu\n",
344 version,
345 revision,
346 loops_per_jiffy * HZ,
347 cpuinfo.dcache_size,
348 cpuinfo.dcache_block_size,
349 cpuinfo.icache_size,
350 cpuinfo.icache_block_size,
351 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
352 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW),
353 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
354 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW),
355 (loops_per_jiffy * HZ) / 500000,
356 ((loops_per_jiffy * HZ) / 5000) % 100);
357}
358
359static void *c_start(struct seq_file *m, loff_t * pos)
360{
361 /* We only have one CPU... */
362 return *pos < 1 ? (void *)1 : NULL;
363}
364
365static void *c_next(struct seq_file *m, void *v, loff_t * pos)
366{
367 ++*pos;
368 return NULL;
369}
370
371static void c_stop(struct seq_file *m, void *v)
372{
373}
374
375const struct seq_operations cpuinfo_op = {
376 .start = c_start,
377 .next = c_next,
378 .stop = c_stop,
379 .show = show_cpuinfo,
380};