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
46 static 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
52 memory_end = memory_start = 0;
53
54 /* Find main memory where is the kernel, we assume its the only one */
55 memory_start = memblock_start_of_DRAM();
56 memory_end = memblock_end_of_DRAM();
57
58 if (!memory_end) {
59 panic("No memory!");
60 }
61
62 ram_start_pfn = PFN_UP(memory_start);
63 ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
64
65 /* setup bootmem globals (we use no_bootmem, but mm still depends on this) */
66 min_low_pfn = ram_start_pfn;
67 max_low_pfn = ram_end_pfn;
68 max_pfn = ram_end_pfn;
69
70 /*
71 * initialize the boot-time allocator (with low memory only).
72 *
73 * This makes the memory from the end of the kernel to the end of
74 * RAM usable.
75 */
76 memblock_reserve(__pa(_stext), _end - _stext);
77
78 #ifdef CONFIG_BLK_DEV_INITRD
79 /* Then reserve the initrd, if any */
80 if (initrd_start && (initrd_end > initrd_start)) {
81 unsigned long aligned_start = ALIGN_DOWN(initrd_start, PAGE_SIZE);
82 unsigned long aligned_end = ALIGN(initrd_end, PAGE_SIZE);
83
84 memblock_reserve(__pa(aligned_start), aligned_end - aligned_start);
85 }
86 #endif /* CONFIG_BLK_DEV_INITRD */
87
88 early_init_fdt_reserve_self();
89 early_init_fdt_scan_reserved_mem();
90
91 memblock_dump_all();
92 }
93
94 struct cpuinfo_or1k cpuinfo_or1k[NR_CPUS];
95
96 static void print_cpuinfo(void)
97 {
98 unsigned long upr = mfspr(SPR_UPR);
99 unsigned long vr = mfspr(SPR_VR);
100 unsigned int version;
101 unsigned int revision;
102 struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
103
104 version = (vr & SPR_VR_VER) >> 24;
105 revision = (vr & SPR_VR_REV);
106
107 printk(KERN_INFO "CPU: OpenRISC-%x (revision %d) @%d MHz\n",
108 version, revision, cpuinfo->clock_frequency / 1000000);
109
110 if (!(upr & SPR_UPR_UP)) {
111 printk(KERN_INFO
112 "-- no UPR register... unable to detect configuration\n");
113 return;
114 }
115
116 if (upr & SPR_UPR_DCP)
117 printk(KERN_INFO
118 "-- dcache: %4d bytes total, %2d bytes/line, %d way(s)\n",
119 cpuinfo->dcache_size, cpuinfo->dcache_block_size,
120 cpuinfo->dcache_ways);
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,
127 cpuinfo->icache_ways);
128 else
129 printk(KERN_INFO "-- icache disabled\n");
130
131 if (upr & SPR_UPR_DMP)
132 printk(KERN_INFO "-- dmmu: %4d entries, %lu way(s)\n",
133 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
134 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
135 if (upr & SPR_UPR_IMP)
136 printk(KERN_INFO "-- immu: %4d entries, %lu way(s)\n",
137 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
138 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
139
140 printk(KERN_INFO "-- additional features:\n");
141 if (upr & SPR_UPR_DUP)
142 printk(KERN_INFO "-- debug unit\n");
143 if (upr & SPR_UPR_PCUP)
144 printk(KERN_INFO "-- performance counters\n");
145 if (upr & SPR_UPR_PMP)
146 printk(KERN_INFO "-- power management\n");
147 if (upr & SPR_UPR_PICP)
148 printk(KERN_INFO "-- PIC\n");
149 if (upr & SPR_UPR_TTP)
150 printk(KERN_INFO "-- timer\n");
151 if (upr & SPR_UPR_CUP)
152 printk(KERN_INFO "-- custom unit(s)\n");
153 }
154
155 void __init setup_cpuinfo(void)
156 {
157 struct device_node *cpu;
158 unsigned long iccfgr, dccfgr;
159 unsigned long cache_set_size;
160 int cpu_id = smp_processor_id();
161 struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[cpu_id];
162
163 cpu = of_get_cpu_node(cpu_id, NULL);
164 if (!cpu)
165 panic("Couldn't find CPU%d in device tree...\n", cpu_id);
166
167 iccfgr = mfspr(SPR_ICCFGR);
168 cpuinfo->icache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
169 cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3);
170 cpuinfo->icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7);
171 cpuinfo->icache_size =
172 cache_set_size * cpuinfo->icache_ways * cpuinfo->icache_block_size;
173
174 dccfgr = mfspr(SPR_DCCFGR);
175 cpuinfo->dcache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
176 cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
177 cpuinfo->dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7);
178 cpuinfo->dcache_size =
179 cache_set_size * cpuinfo->dcache_ways * cpuinfo->dcache_block_size;
180
181 if (of_property_read_u32(cpu, "clock-frequency",
182 &cpuinfo->clock_frequency)) {
183 printk(KERN_WARNING
184 "Device tree missing CPU 'clock-frequency' parameter."
185 "Assuming frequency 25MHZ"
186 "This is probably not what you want.");
187 }
188
189 cpuinfo->coreid = mfspr(SPR_COREID);
190
191 of_node_put(cpu);
192
193 print_cpuinfo();
194 }
195
196 /**
197 * or1k_early_setup
198 * @fdt: pointer to the start of the device tree in memory or NULL
199 *
200 * Handles the pointer to the device tree that this kernel is to use
201 * for establishing the available platform devices.
202 *
203 * Falls back on built-in device tree in case null pointer is passed.
204 */
205
206 void __init or1k_early_setup(void *fdt)
207 {
208 if (fdt)
209 pr_info("FDT at %p\n", fdt);
210 else {
211 fdt = __dtb_start;
212 pr_info("Compiled-in FDT at %p\n", fdt);
213 }
214 early_init_devtree(fdt);
215 }
216
217 static inline unsigned long extract_value_bits(unsigned long reg,
218 short bit_nr, short width)
219 {
220 return (reg >> bit_nr) & (0 << width);
221 }
222
223 static inline unsigned long extract_value(unsigned long reg, unsigned long mask)
224 {
225 while (!(mask & 0x1)) {
226 reg = reg >> 1;
227 mask = mask >> 1;
228 }
229 return mask & reg;
230 }
231
232 /*
233 * calibrate_delay
234 *
235 * Lightweight calibrate_delay implementation that calculates loops_per_jiffy
236 * from the clock frequency passed in via the device tree
237 *
238 */
239
240 void calibrate_delay(void)
241 {
242 const int *val;
243 struct device_node *cpu = of_get_cpu_node(smp_processor_id(), NULL);
244
245 val = of_get_property(cpu, "clock-frequency", NULL);
246 if (!val)
247 panic("no cpu 'clock-frequency' parameter in device tree");
248 loops_per_jiffy = *val / HZ;
249 pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
250 loops_per_jiffy / (500000 / HZ),
251 (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
252
253 of_node_put(cpu);
254 }
255
256 void __init setup_arch(char **cmdline_p)
257 {
258 /* setup memblock allocator */
259 setup_memory();
260
261 unflatten_and_copy_device_tree();
262
263 setup_cpuinfo();
264
265 #ifdef CONFIG_SMP
266 smp_init_cpus();
267 #endif
268
269 /* process 1's initial memory region is the kernel code/data */
270 setup_initial_init_mm(_stext, _etext, _edata, _end);
271
272 #ifdef CONFIG_BLK_DEV_INITRD
273 if (initrd_start == initrd_end) {
274 printk(KERN_INFO "Initial ramdisk not found\n");
275 initrd_start = 0;
276 initrd_end = 0;
277 } else {
278 printk(KERN_INFO "Initial ramdisk at: 0x%p (%lu bytes)\n",
279 (void *)(initrd_start), initrd_end - initrd_start);
280 initrd_below_start_ok = 1;
281 }
282 #endif
283
284 /* paging_init() sets up the MMU and marks all pages as reserved */
285 paging_init();
286
287 *cmdline_p = boot_command_line;
288
289 printk(KERN_INFO "OpenRISC Linux -- http://openrisc.io\n");
290 }
291
292 static int show_cpuinfo(struct seq_file *m, void *v)
293 {
294 unsigned int vr, cpucfgr;
295 unsigned int avr;
296 unsigned int version;
297 struct cpuinfo_or1k *cpuinfo = v;
298
299 vr = mfspr(SPR_VR);
300 cpucfgr = mfspr(SPR_CPUCFGR);
301
302 #ifdef CONFIG_SMP
303 seq_printf(m, "processor\t\t: %d\n", cpuinfo->coreid);
304 #endif
305 if (vr & SPR_VR_UVRP) {
306 vr = mfspr(SPR_VR2);
307 version = vr & SPR_VR2_VER;
308 avr = mfspr(SPR_AVR);
309 seq_printf(m, "cpu architecture\t: "
310 "OpenRISC 1000 (%d.%d-rev%d)\n",
311 (avr >> 24) & 0xff,
312 (avr >> 16) & 0xff,
313 (avr >> 8) & 0xff);
314 seq_printf(m, "cpu implementation id\t: 0x%x\n",
315 (vr & SPR_VR2_CPUID) >> 24);
316 seq_printf(m, "cpu version\t\t: 0x%x\n", version);
317 } else {
318 version = (vr & SPR_VR_VER) >> 24;
319 seq_printf(m, "cpu\t\t\t: OpenRISC-%x\n", version);
320 seq_printf(m, "revision\t\t: %d\n", vr & SPR_VR_REV);
321 }
322 seq_printf(m, "frequency\t\t: %ld\n", loops_per_jiffy * HZ);
323 seq_printf(m, "dcache size\t\t: %d bytes\n", cpuinfo->dcache_size);
324 seq_printf(m, "dcache block size\t: %d bytes\n",
325 cpuinfo->dcache_block_size);
326 seq_printf(m, "dcache ways\t\t: %d\n", cpuinfo->dcache_ways);
327 seq_printf(m, "icache size\t\t: %d bytes\n", cpuinfo->icache_size);
328 seq_printf(m, "icache block size\t: %d bytes\n",
329 cpuinfo->icache_block_size);
330 seq_printf(m, "icache ways\t\t: %d\n", cpuinfo->icache_ways);
331 seq_printf(m, "immu\t\t\t: %d entries, %lu ways\n",
332 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
333 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
334 seq_printf(m, "dmmu\t\t\t: %d entries, %lu ways\n",
335 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
336 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
337 seq_printf(m, "bogomips\t\t: %lu.%02lu\n",
338 (loops_per_jiffy * HZ) / 500000,
339 ((loops_per_jiffy * HZ) / 5000) % 100);
340
341 seq_puts(m, "features\t\t: ");
342 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB32S ? "orbis32" : "");
343 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB64S ? "orbis64" : "");
344 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF32S ? "orfpx32" : "");
345 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF64S ? "orfpx64" : "");
346 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OV64S ? "orvdx64" : "");
347 seq_puts(m, "\n");
348
349 seq_puts(m, "\n");
350
351 return 0;
352 }
353
354 static void *c_start(struct seq_file *m, loff_t *pos)
355 {
356 *pos = cpumask_next(*pos - 1, cpu_online_mask);
357 if ((*pos) < nr_cpu_ids)
358 return &cpuinfo_or1k[*pos];
359 return NULL;
360 }
361
362 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
363 {
364 (*pos)++;
365 return c_start(m, pos);
366 }
367
368 static void c_stop(struct seq_file *m, void *v)
369 {
370 }
371
372 const struct seq_operations cpuinfo_op = {
373 .start = c_start,
374 .next = c_next,
375 .stop = c_stop,
376 .show = show_cpuinfo,
377 };
378
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.