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
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(fmt: "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), size: _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), size: 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
94struct cpuinfo_or1k cpuinfo_or1k[NR_CPUS];
95
96static 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_DMP)
117 printk(KERN_INFO "-- dmmu: %4d entries, %lu way(s)\n",
118 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
119 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
120 if (upr & SPR_UPR_IMP)
121 printk(KERN_INFO "-- immu: %4d entries, %lu way(s)\n",
122 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
123 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
124
125 printk(KERN_INFO "-- additional features:\n");
126 if (upr & SPR_UPR_DUP)
127 printk(KERN_INFO "-- debug unit\n");
128 if (upr & SPR_UPR_PCUP)
129 printk(KERN_INFO "-- performance counters\n");
130 if (upr & SPR_UPR_PMP)
131 printk(KERN_INFO "-- power management\n");
132 if (upr & SPR_UPR_PICP)
133 printk(KERN_INFO "-- PIC\n");
134 if (upr & SPR_UPR_TTP)
135 printk(KERN_INFO "-- timer\n");
136 if (upr & SPR_UPR_CUP)
137 printk(KERN_INFO "-- custom unit(s)\n");
138}
139
140void __init setup_cpuinfo(void)
141{
142 struct device_node *cpu;
143 int cpu_id = smp_processor_id();
144 struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[cpu_id];
145
146 cpu = of_get_cpu_node(cpu: cpu_id, NULL);
147 if (!cpu)
148 panic(fmt: "Couldn't find CPU%d in device tree...\n", cpu_id);
149
150 if (of_property_read_u32(np: cpu, propname: "clock-frequency",
151 out_value: &cpuinfo->clock_frequency)) {
152 printk(KERN_WARNING
153 "Device tree missing CPU 'clock-frequency' parameter."
154 "Assuming frequency 25MHZ"
155 "This is probably not what you want.");
156 }
157
158 cpuinfo->coreid = mfspr(SPR_COREID);
159
160 of_node_put(node: cpu);
161
162 print_cpuinfo();
163}
164
165/**
166 * or1k_early_setup
167 * @fdt: pointer to the start of the device tree in memory or NULL
168 *
169 * Handles the pointer to the device tree that this kernel is to use
170 * for establishing the available platform devices.
171 *
172 * Falls back on built-in device tree in case null pointer is passed.
173 */
174
175void __init or1k_early_setup(void *fdt)
176{
177 if (fdt)
178 pr_info("FDT at %p\n", fdt);
179 else {
180 fdt = __dtb_start;
181 pr_info("Compiled-in FDT at %p\n", fdt);
182 }
183 early_init_devtree(fdt);
184}
185
186static inline unsigned long extract_value_bits(unsigned long reg,
187 short bit_nr, short width)
188{
189 return (reg >> bit_nr) & (0 << width);
190}
191
192static inline unsigned long extract_value(unsigned long reg, unsigned long mask)
193{
194 while (!(mask & 0x1)) {
195 reg = reg >> 1;
196 mask = mask >> 1;
197 }
198 return mask & reg;
199}
200
201/*
202 * calibrate_delay
203 *
204 * Lightweight calibrate_delay implementation that calculates loops_per_jiffy
205 * from the clock frequency passed in via the device tree
206 *
207 */
208
209void calibrate_delay(void)
210{
211 const int *val;
212 struct device_node *cpu = of_get_cpu_node(smp_processor_id(), NULL);
213
214 val = of_get_property(node: cpu, name: "clock-frequency", NULL);
215 if (!val)
216 panic(fmt: "no cpu 'clock-frequency' parameter in device tree");
217 loops_per_jiffy = *val / HZ;
218 pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
219 loops_per_jiffy / (500000 / HZ),
220 (loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
221
222 of_node_put(node: cpu);
223}
224
225void __init setup_arch(char **cmdline_p)
226{
227 /* setup memblock allocator */
228 setup_memory();
229
230 unflatten_and_copy_device_tree();
231
232 setup_cpuinfo();
233
234#ifdef CONFIG_SMP
235 smp_init_cpus();
236#endif
237
238 /* process 1's initial memory region is the kernel code/data */
239 setup_initial_init_mm(start_code: _stext, end_code: _etext, end_data: _edata, brk: _end);
240
241#ifdef CONFIG_BLK_DEV_INITRD
242 if (initrd_start == initrd_end) {
243 printk(KERN_INFO "Initial ramdisk not found\n");
244 initrd_start = 0;
245 initrd_end = 0;
246 } else {
247 printk(KERN_INFO "Initial ramdisk at: 0x%p (%lu bytes)\n",
248 (void *)(initrd_start), initrd_end - initrd_start);
249 initrd_below_start_ok = 1;
250 }
251#endif
252 /* perform jump_table sorting before paging_init locks down read only memory */
253 jump_label_init();
254
255 /* paging_init() sets up the MMU and marks all pages as reserved */
256 paging_init();
257
258 *cmdline_p = boot_command_line;
259
260 printk(KERN_INFO "OpenRISC Linux -- http://openrisc.io\n");
261}
262
263static int show_cpuinfo(struct seq_file *m, void *v)
264{
265 unsigned int vr, cpucfgr;
266 unsigned int avr;
267 unsigned int version;
268#ifdef CONFIG_SMP
269 struct cpuinfo_or1k *cpuinfo = v;
270 seq_printf(m, fmt: "processor\t\t: %d\n", cpuinfo->coreid);
271#endif
272
273 vr = mfspr(SPR_VR);
274 cpucfgr = mfspr(SPR_CPUCFGR);
275
276 if (vr & SPR_VR_UVRP) {
277 vr = mfspr(SPR_VR2);
278 version = vr & SPR_VR2_VER;
279 avr = mfspr(SPR_AVR);
280 seq_printf(m, fmt: "cpu architecture\t: "
281 "OpenRISC 1000 (%d.%d-rev%d)\n",
282 (avr >> 24) & 0xff,
283 (avr >> 16) & 0xff,
284 (avr >> 8) & 0xff);
285 seq_printf(m, "cpu implementation id\t: 0x%x\n",
286 (vr & SPR_VR2_CPUID) >> 24);
287 seq_printf(m, fmt: "cpu version\t\t: 0x%x\n", version);
288 } else {
289 version = (vr & SPR_VR_VER) >> 24;
290 seq_printf(m, fmt: "cpu\t\t\t: OpenRISC-%x\n", version);
291 seq_printf(m, fmt: "revision\t\t: %d\n", vr & SPR_VR_REV);
292 }
293 seq_printf(m, fmt: "frequency\t\t: %ld\n", loops_per_jiffy * HZ);
294 seq_printf(m, "immu\t\t\t: %d entries, %lu ways\n",
295 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
296 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
297 seq_printf(m, "dmmu\t\t\t: %d entries, %lu ways\n",
298 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
299 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
300 seq_printf(m, fmt: "bogomips\t\t: %lu.%02lu\n",
301 (loops_per_jiffy * HZ) / 500000,
302 ((loops_per_jiffy * HZ) / 5000) % 100);
303
304 seq_puts(m, s: "features\t\t: ");
305 seq_printf(m, fmt: "%s ", cpucfgr & SPR_CPUCFGR_OB32S ? "orbis32" : "");
306 seq_printf(m, fmt: "%s ", cpucfgr & SPR_CPUCFGR_OB64S ? "orbis64" : "");
307 seq_printf(m, fmt: "%s ", cpucfgr & SPR_CPUCFGR_OF32S ? "orfpx32" : "");
308 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF64S ? "orfpx64" : "");
309 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OV64S ? "orvdx64" : "");
310 seq_puts(m, s: "\n");
311
312 seq_puts(m, s: "\n");
313
314 return 0;
315}
316
317static void *c_start(struct seq_file *m, loff_t *pos)
318{
319 *pos = cpumask_next(n: *pos - 1, cpu_online_mask);
320 if ((*pos) < nr_cpu_ids)
321 return &cpuinfo_or1k[*pos];
322 return NULL;
323}
324
325static void *c_next(struct seq_file *m, void *v, loff_t *pos)
326{
327 (*pos)++;
328 return c_start(m, pos);
329}
330
331static void c_stop(struct seq_file *m, void *v)
332{
333}
334
335const struct seq_operations cpuinfo_op = {
336 .start = c_start,
337 .next = c_next,
338 .stop = c_stop,
339 .show = show_cpuinfo,
340};
341

source code of linux/arch/openrisc/kernel/setup.c