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
setup_memory(void)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
print_cpuinfo(void)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_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
setup_cpuinfo(void)140 void __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_id, NULL);
147 if (!cpu)
148 panic("Couldn't find CPU%d in device tree...\n", cpu_id);
149
150 if (of_property_read_u32(cpu, "clock-frequency",
151 &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(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
or1k_early_setup(void * fdt)175 void __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
extract_value_bits(unsigned long reg,short bit_nr,short width)186 static 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
extract_value(unsigned long reg,unsigned long mask)192 static 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
calibrate_delay(void)209 void 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(cpu, "clock-frequency", NULL);
215 if (!val)
216 panic("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(cpu);
223 }
224
setup_arch(char ** cmdline_p)225 void __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(_stext, _etext, _edata, _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
253 /* paging_init() sets up the MMU and marks all pages as reserved */
254 paging_init();
255
256 *cmdline_p = boot_command_line;
257
258 printk(KERN_INFO "OpenRISC Linux -- http://openrisc.io\n");
259 }
260
show_cpuinfo(struct seq_file * m,void * v)261 static int show_cpuinfo(struct seq_file *m, void *v)
262 {
263 unsigned int vr, cpucfgr;
264 unsigned int avr;
265 unsigned int version;
266 #ifdef CONFIG_SMP
267 struct cpuinfo_or1k *cpuinfo = v;
268 seq_printf(m, "processor\t\t: %d\n", cpuinfo->coreid);
269 #endif
270
271 vr = mfspr(SPR_VR);
272 cpucfgr = mfspr(SPR_CPUCFGR);
273
274 if (vr & SPR_VR_UVRP) {
275 vr = mfspr(SPR_VR2);
276 version = vr & SPR_VR2_VER;
277 avr = mfspr(SPR_AVR);
278 seq_printf(m, "cpu architecture\t: "
279 "OpenRISC 1000 (%d.%d-rev%d)\n",
280 (avr >> 24) & 0xff,
281 (avr >> 16) & 0xff,
282 (avr >> 8) & 0xff);
283 seq_printf(m, "cpu implementation id\t: 0x%x\n",
284 (vr & SPR_VR2_CPUID) >> 24);
285 seq_printf(m, "cpu version\t\t: 0x%x\n", version);
286 } else {
287 version = (vr & SPR_VR_VER) >> 24;
288 seq_printf(m, "cpu\t\t\t: OpenRISC-%x\n", version);
289 seq_printf(m, "revision\t\t: %d\n", vr & SPR_VR_REV);
290 }
291 seq_printf(m, "frequency\t\t: %ld\n", loops_per_jiffy * HZ);
292 seq_printf(m, "immu\t\t\t: %d entries, %lu ways\n",
293 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
294 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
295 seq_printf(m, "dmmu\t\t\t: %d entries, %lu ways\n",
296 1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
297 1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
298 seq_printf(m, "bogomips\t\t: %lu.%02lu\n",
299 (loops_per_jiffy * HZ) / 500000,
300 ((loops_per_jiffy * HZ) / 5000) % 100);
301
302 seq_puts(m, "features\t\t: ");
303 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB32S ? "orbis32" : "");
304 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OB64S ? "orbis64" : "");
305 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF32S ? "orfpx32" : "");
306 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OF64S ? "orfpx64" : "");
307 seq_printf(m, "%s ", cpucfgr & SPR_CPUCFGR_OV64S ? "orvdx64" : "");
308 seq_puts(m, "\n");
309
310 seq_puts(m, "\n");
311
312 return 0;
313 }
314
c_start(struct seq_file * m,loff_t * pos)315 static void *c_start(struct seq_file *m, loff_t *pos)
316 {
317 *pos = cpumask_next(*pos - 1, cpu_online_mask);
318 if ((*pos) < nr_cpu_ids)
319 return &cpuinfo_or1k[*pos];
320 return NULL;
321 }
322
c_next(struct seq_file * m,void * v,loff_t * pos)323 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
324 {
325 (*pos)++;
326 return c_start(m, pos);
327 }
328
c_stop(struct seq_file * m,void * v)329 static void c_stop(struct seq_file *m, void *v)
330 {
331 }
332
333 const struct seq_operations cpuinfo_op = {
334 .start = c_start,
335 .next = c_next,
336 .stop = c_stop,
337 .show = show_cpuinfo,
338 };
339