xref: /netbsd-src/sys/arch/evbmips/atheros/machdep.c (revision f36002f244a49908fef9cba8789032bdbf48d572)
1 /* $NetBSD: machdep.c,v 1.34 2024/03/05 14:15:30 thorpej Exp $ */
2 
3 /*
4  * Copyright (c) 2006 Urbana-Champaign Independent Media Center.
5  * Copyright (c) 2006 Garrett D'Amore.
6  * All rights reserved.
7  *
8  * Portions of this code were written by Garrett D'Amore for the
9  * Champaign-Urbana Community Wireless Network Project.
10  *
11  * Redistribution and use in source and binary forms, with or
12  * without modification, are permitted provided that the following
13  * conditions are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above
17  *    copyright notice, this list of conditions and the following
18  *    disclaimer in the documentation and/or other materials provided
19  *    with the distribution.
20  * 3. All advertising materials mentioning features or use of this
21  *    software must display the following acknowledgements:
22  *      This product includes software developed by the Urbana-Champaign
23  *      Independent Media Center.
24  *	This product includes software developed by Garrett D'Amore.
25  * 4. Urbana-Champaign Independent Media Center's name and Garrett
26  *    D'Amore's name may not be used to endorse or promote products
27  *    derived from this software without specific prior written permission.
28  *
29  * THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT
30  * MEDIA CENTER AND GARRETT D'AMORE ``AS IS'' AND ANY EXPRESS OR
31  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
32  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE URBANA-CHAMPAIGN INDEPENDENT
34  * MEDIA CENTER OR GARRETT D'AMORE BE LIABLE FOR ANY DIRECT, INDIRECT,
35  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
37  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
38  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
40  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
41  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42  */
43 /*-
44  * Copyright (c) 2006 Itronix Inc.
45  * All rights reserved.
46  *
47  * Portions written by Garrett D'Amore for Itronix Inc.
48  *
49  * Redistribution and use in source and binary forms, with or without
50  * modification, are permitted provided that the following conditions
51  * are met:
52  * 1. Redistributions of source code must retain the above copyright
53  *    notice, this list of conditions and the following disclaimer.
54  * 2. Redistributions in binary form must reproduce the above copyright
55  *    notice, this list of conditions and the following disclaimer in the
56  *    documentation and/or other materials provided with the distribution.
57  * 3. The name of Itronix Inc. may not be used to endorse
58  *    or promote products derived from this software without specific
59  *    prior written permission.
60  *
61  * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND
62  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
63  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
64  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY
65  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
66  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
67  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
68  * ON ANY THEORY OF LIABILITY, WHETHER IN
69  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
70  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
71  * POSSIBILITY OF SUCH DAMAGE.
72  */
73 
74 /*
75  * Copyright (c) 1988 University of Utah.
76  * Copyright (c) 1992, 1993
77  *	The Regents of the University of California.  All rights reserved.
78  *
79  * This code is derived from software contributed to Berkeley by
80  * the Systems Programming Group of the University of Utah Computer
81  * Science Department, The Mach Operating System project at
82  * Carnegie-Mellon University and Ralph Campbell.
83  *
84  * Redistribution and use in source and binary forms, with or without
85  * modification, are permitted provided that the following conditions
86  * are met:
87  * 1. Redistributions of source code must retain the above copyright
88  *    notice, this list of conditions and the following disclaimer.
89  * 2. Redistributions in binary form must reproduce the above copyright
90  *    notice, this list of conditions and the following disclaimer in the
91  *    documentation and/or other materials provided with the distribution.
92  * 3. Neither the name of the University nor the names of its contributors
93  *    may be used to endorse or promote products derived from this software
94  *    without specific prior written permission.
95  *
96  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
97  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
98  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
99  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
100  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
101  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
102  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
103  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
104  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
105  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
106  * SUCH DAMAGE.
107  *
108  *	@(#)machdep.c	8.3 (Berkeley) 1/12/94
109  * 	from: Utah Hdr: machdep.c 1.63 91/04/24
110  */
111 
112 #include <sys/cdefs.h>
113 __KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.34 2024/03/05 14:15:30 thorpej Exp $");
114 
115 #include "opt_ddb.h"
116 #include "opt_kgdb.h"
117 #include "opt_modular.h"
118 
119 #include <sys/param.h>
120 #include <sys/boot_flag.h>
121 #include <sys/device.h>
122 #include <sys/kernel.h>
123 #include <sys/kcore.h>
124 #include <sys/ksyms.h>
125 #include <sys/mount.h>
126 #include <sys/reboot.h>
127 #include <sys/cpu.h>
128 
129 #include <uvm/uvm_extern.h>
130 
131 #include <dev/cons.h>
132 
133 #include "ksyms.h"
134 
135 #if NKSYMS || defined(DDB) || defined(MODULAR)
136 #include <mips/db_machdep.h>
137 #include <ddb/db_extern.h>
138 #endif
139 
140 #include <mips/cache.h>
141 #include <mips/locore.h>
142 #include <mips/cpuregs.h>
143 
144 #include <mips/atheros/include/platform.h>
145 #include <mips/atheros/include/arbusvar.h>
146 
147 /* Maps for VM objects. */
148 struct vm_map *phys_map = NULL;
149 
150 int maxmem;			/* max memory per process */
151 
152 int mem_cluster_cnt;
153 phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];
154 
155 void	mach_init(void); /* XXX */
156 
157 /* Currently the Atheros kernels only support big endian boards */
158 CTASSERT(_BYTE_ORDER == _BIG_ENDIAN);
159 
160 static void
cal_timer(void)161 cal_timer(void)
162 {
163 	uint32_t	cntfreq;
164 
165 	cntfreq = curcpu()->ci_cpu_freq = atheros_get_cpu_freq();
166 
167 	/* MIPS 4Kc CP0 counts every other clock */
168 	if (mips_options.mips_cpu_flags & CPU_MIPS_DOUBLE_COUNT)
169 		cntfreq /= 2;
170 
171 	curcpu()->ci_cctr_freq = cntfreq;
172 	curcpu()->ci_cycles_per_hz = (cntfreq + hz / 2) / hz;
173 
174 	/* Compute number of cycles per 1us (1/MHz). 0.5MHz is for roundup. */
175 	curcpu()->ci_divisor_delay = ((cntfreq + 500000) / 1000000);
176 }
177 
178 void
mach_init(void)179 mach_init(void)
180 {
181 	void *kernend;
182 	uint32_t memsize;
183 
184 	extern char edata[], end[];	/* XXX */
185 
186 	/* clear the BSS segment */
187 	kernend = (void *)mips_round_page(end);
188 
189 	memset(edata, 0, (char *)kernend - edata);
190 
191 	/* setup early console */
192 	atheros_set_platformsw();
193 
194 	/* set CPU model info for sysctl_hw */
195 	cpu_setmodel("Atheros %s", atheros_get_cpuname());
196 
197 	/*
198 	 * Set up the exception vectors and CPU-specific function
199 	 * vectors early on.  We need the wbflush() vector set up
200 	 * before comcnattach() is called (or at least before the
201 	 * first printf() after that is called).
202 	 * Sets up mips_cpu_flags that may be queried by other
203 	 * functions called during startup.
204 	 * Also clears the I+D caches.
205 	 */
206 	mips_vector_init(NULL, false);
207 
208 	/*
209 	 * Calibrate timers.
210 	 */
211 	cal_timer();
212 
213 	uvm_md_init();
214 
215 	/*
216 	 * Look at arguments passed to us and compute boothowto.
217 	 */
218 	boothowto = RB_AUTOBOOT;
219 #ifdef KADB
220 	boothowto |= RB_KDB;
221 #endif
222 
223 	/*
224 	 * This would be a good place to parse a boot command line, if
225 	 * we got one from the bootloader.  Right now we have no way to
226 	 * get one from e.g. vxworks.
227 	 */
228 
229 	/*
230 	 * Determine the memory size.
231 	 *
232 	 * Note: Reserve the first page!  That's where the trap
233 	 * vectors are located.
234 	 */
235 	memsize = atheros_get_memsize();
236 
237 	printf("Memory size: 0x%08x\n", memsize);
238 	physmem = btoc(memsize);
239 
240 	mem_clusters[mem_cluster_cnt].start = PAGE_SIZE;
241 	mem_clusters[mem_cluster_cnt].size =
242 	    memsize - mem_clusters[mem_cluster_cnt].start;
243 	mem_cluster_cnt++;
244 
245 	/*
246 	 * Load the available pages into the VM system.
247 	 */
248 	mips_page_physload(MIPS_KSEG0_START, (vaddr_t)kernend,
249 	    mem_clusters, mem_cluster_cnt, NULL, 0);
250 
251 	/*
252 	 * Initialize message buffer (at end of core).
253 	 */
254 	mips_init_msgbuf();
255 
256 	/*
257 	 * Initialize the virtual memory system.
258 	 */
259 	pmap_bootstrap();
260 
261 	/*
262 	 * Allocate uarea page for lwp0 and set it.
263 	 */
264 	mips_init_lwp0_uarea();
265 
266 	/*
267 	 * Initialize busses.
268 	 */
269 	atheros_bus_init();
270 
271 	/*
272 	 * Turn off (ignore) the hardware watchdog.  If we got this
273 	 * far, then we shouldn't need it anymore.
274 	 */
275 	atheros_wdog_reload(0);
276 
277 	/*
278 	 * Turn off watchpoint that may have been enabled by the
279 	 * PROM.  VxWorks bootloader seems to leave one set.
280 	 */
281 	__asm volatile (
282 		"mtc0	$0, $%0\n\t"
283 		"nop\n\t"
284 		"nop\n\t" :: "n"(MIPS_COP_0_WATCH_LO));
285 
286 	/*
287 	 * Initialize debuggers, and break into them, if appropriate.
288 	 */
289 #ifdef DDB
290 	if (boothowto & RB_KDB)
291 		Debugger();
292 #endif
293 }
294 
295 void
consinit(void)296 consinit(void)
297 {
298 
299 	/*
300 	 * Everything related to console initialization is done
301 	 * in mach_init().
302 	 */
303 	atheros_consinit();
304 }
305 
306 void
cpu_startup(void)307 cpu_startup(void)
308 {
309 	cpu_startup_common();
310 }
311 
312 void
cpu_reboot(int howto,char * bootstr)313 cpu_reboot(int howto, char *bootstr)
314 {
315 	static int waittime = -1;
316 
317 	/* Take a snapshot before clobbering any registers. */
318 	savectx(curpcb);
319 
320 	/* If "always halt" was specified as a boot flag, obey. */
321 	if (boothowto & RB_HALT)
322 		howto |= RB_HALT;
323 
324 	boothowto = howto;
325 
326 	/* If system is cold, just halt. */
327 	if (cold) {
328 		boothowto |= RB_HALT;
329 		goto haltsys;
330 	}
331 
332 	if ((boothowto & RB_NOSYNC) == 0 && waittime < 0) {
333 		waittime = 0;
334 
335 		/*
336 		 * Synchronize the disks....
337 		 */
338 		vfs_shutdown();
339 	}
340 
341 	/* Disable interrupts. */
342 	splhigh();
343 
344 	if (boothowto & RB_DUMP)
345 		dumpsys();
346 
347  haltsys:
348 	/* Run any shutdown hooks. */
349 	doshutdownhooks();
350 
351 	pmf_system_shutdown(boothowto);
352 
353 #if 0
354 	if ((boothowto & RB_POWERDOWN) == RB_POWERDOWN)
355 		if (board && board->ab_poweroff)
356 			board->ab_poweroff();
357 #endif
358 
359 	/*
360 	 * Firmware may autoboot (depending on settings), and we cannot pass
361 	 * flags to it (at least I haven't figured out how to yet), so
362 	 * we "pseudo-halt" now.
363 	 */
364 	if (boothowto & RB_HALT) {
365 		printf("\n");
366 		printf("The operating system has halted.\n");
367 		printf("Please press any key to reboot.\n\n");
368 		cnpollc(1);	/* For proper keyboard command handling */
369 		cngetc();
370 		cnpollc(0);
371 	}
372 
373 	printf("resetting board...\n\n");
374 	mips_icache_sync_all();
375 	mips_dcache_wbinv_all();
376 	atheros_reset();
377 	__asm volatile("jr	%0" :: "r"(MIPS_RESET_EXC_VEC));
378 	printf("Oops, back from reset\n\nSpinning...");
379 	for (;;)
380 		/* spin forever */ ;	/* XXX */
381 	/*NOTREACHED*/
382 }
383