malta_machdep.c revision 182901 
1/*-
2 * Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/mips/malta/malta_machdep.c 182901 2008-09-10 03:49:08Z gonzo $
27 */
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: head/sys/mips/malta/malta_machdep.c 182901 2008-09-10 03:49:08Z gonzo $");
30
31#include "opt_ddb.h"
32
33#include <sys/param.h>
34#include <sys/conf.h>
35#include <sys/kernel.h>
36#include <sys/systm.h>
37#include <sys/imgact.h>
38#include <sys/bio.h>
39#include <sys/buf.h>
40#include <sys/bus.h>
41#include <sys/cpu.h>
42#include <sys/cons.h>
43#include <sys/exec.h>
44#include <sys/ucontext.h>
45#include <sys/proc.h>
46#include <sys/kdb.h>
47#include <sys/ptrace.h>
48#include <sys/reboot.h>
49#include <sys/signalvar.h>
50#include <sys/sysent.h>
51#include <sys/sysproto.h>
52#include <sys/user.h>
53
54#include <vm/vm.h>
55#include <vm/vm_object.h>
56#include <vm/vm_page.h>
57#include <vm/vm_pager.h>
58
59#include <machine/clock.h>
60#include <machine/cpu.h>
61#include <machine/cpuregs.h>
62#include <machine/hwfunc.h>
63#include <machine/md_var.h>
64#include <machine/pmap.h>
65#include <machine/trap.h>
66
67#ifdef TICK_USE_YAMON_FREQ
68#include <mips/malta/yamon.h>
69#endif
70
71#ifdef TICK_USE_MALTA_RTC
72#include <mips/mips4k/malta/maltareg.h>
73#include <dev/mc146818/mc146818reg.h>
74#include <isa/rtc.h>
75#endif
76
77#include <mips/malta/maltareg.h>
78
79extern int	*edata;
80extern int	*end;
81
82void	lcd_init(void);
83void	lcd_puts(char *);
84void	malta_reset(void);
85
86/*
87 * Offsets to MALTA LCD characters.
88 */
89static int malta_lcd_offs[] = {
90	MALTA_ASCIIPOS0,
91	MALTA_ASCIIPOS1,
92	MALTA_ASCIIPOS2,
93	MALTA_ASCIIPOS3,
94	MALTA_ASCIIPOS4,
95	MALTA_ASCIIPOS5,
96	MALTA_ASCIIPOS6,
97	MALTA_ASCIIPOS7
98};
99
100/*
101 * Put character to Malta LCD at given position.
102 */
103static void
104malta_lcd_putc(int pos, char c)
105{
106	void *addr;
107	char *ch;
108
109	if (pos < 0 || pos > 7)
110		return;
111	addr = (void *)(MALTA_ASCII_BASE + malta_lcd_offs[pos]);
112	ch = (char *)MIPS_PHYS_TO_KSEG0(addr);
113	*ch = c;
114}
115
116/*
117 * Print given string on LCD.
118 */
119static void
120malta_lcd_print(char *str)
121{
122	int i;
123
124	if (str == NULL)
125		return;
126
127	for (i = 0; *str != '\0'; i++, str++)
128		malta_lcd_putc(i, *str);
129}
130
131void
132lcd_init(void)
133{
134	malta_lcd_print("FreeBSD_");
135}
136
137void
138lcd_puts(char *s)
139{
140	malta_lcd_print(s);
141}
142
143#ifdef TICK_USE_MALTA_RTC
144static __inline uint8_t
145rtcin(uint8_t addr)
146{
147
148	*((volatile uint8_t *)
149	    MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
150	return (*((volatile uint8_t *)
151	    MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))));
152}
153
154static __inline void
155writertc(uint8_t addr, uint8_t val)
156{
157
158	*((volatile uint8_t *)
159	    MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
160	*((volatile uint8_t *)
161	    MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))) = val;
162}
163#endif
164
165static void
166mips_init(void)
167{
168	int i;
169
170	for (i = 0; i < 10; i++) {
171		phys_avail[i] = 0;
172	}
173
174	/* phys_avail regions are in bytes */
175	phys_avail[0] = MIPS_KSEG0_TO_PHYS((vm_offset_t)&end);
176	phys_avail[1] = ctob(realmem);
177
178	physmem = realmem;
179
180	init_param1();
181	init_param2(physmem);
182	mips_cpu_init();
183	pmap_bootstrap();
184	mips_proc0_init();
185	mutex_init();
186#ifdef DDB
187	kdb_init();
188#endif
189}
190
191void
192platform_halt(void)
193{
194
195}
196
197
198void
199platform_identify(void)
200{
201
202}
203
204/*
205 * Perform a board-level soft-reset.
206 * Note that this is not emulated by gxemul.
207 */
208void
209platform_reset(void)
210{
211	char *c;
212
213	c = (char *)MIPS_PHYS_TO_KSEG0(MALTA_SOFTRES);
214	*c = MALTA_GORESET;
215}
216
217void
218platform_trap_enter(void)
219{
220
221}
222
223void
224platform_trap_exit(void)
225{
226
227}
228
229void
230platform_start(__register_t a0, __register_t a1,  __register_t a2,
231    __register_t a3)
232{
233	vm_offset_t kernend;
234	uint64_t platform_counter_freq;
235	int argc = a0;
236	char **argv = (char **)a1;
237	char **envp = (char **)a2;
238	unsigned int memsize = a3;
239	int i;
240
241	/* clear the BSS and SBSS segments */
242	kernend = round_page((vm_offset_t)&end);
243	memset(&edata, 0, kernend - (vm_offset_t)(&edata));
244
245	cninit();
246	printf("entry: platform_start()\n");
247
248	bootverbose = 1;
249	if (bootverbose) {
250		printf("cmd line: ");
251		for (i = 0; i < argc; i++)
252			printf("%s ", argv[i]);
253		printf("\n");
254
255		printf("envp:\n");
256		for (i = 0; envp[i]; i += 2)
257			printf("\t%s = %s\n", envp[i], envp[i+1]);
258
259		printf("memsize = %08x\n", memsize);
260	}
261
262	realmem = btoc(memsize);
263	mips_init();
264
265	do {
266#if defined(TICK_USE_YAMON_FREQ)
267		/*
268		 * If we are running on a board which uses YAMON firmware,
269		 * then query CPU pipeline clock from the syscon object.
270		 * If unsuccessful, use hard-coded default.
271		 */
272		platform_counter_freq = yamon_getcpufreq();
273		if (platform_counter_freq == 0)
274			platform_counter_freq = MIPS_DEFAULT_HZ;
275
276#elif defined(TICK_USE_MALTA_RTC)
277		/*
278		 * If we are running on a board with the MC146818 RTC,
279		 * use it to determine CPU pipeline clock frequency.
280		 */
281		u_int64_t counterval[2];
282
283		/* Set RTC to binary mode. */
284		writertc(RTC_STATUSB, (rtcin(RTC_STATUSB) | RTCSB_BCD));
285
286		/* Busy-wait for falling edge of RTC update. */
287		while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
288			;
289		while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
290			;
291		counterval[0] = mips_rd_count();
292
293		/* Busy-wait for falling edge of RTC update. */
294		while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
295			;
296		while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
297			;
298		counterval[1] = mips_rd_count();
299
300		platform_counter_freq = counterval[1] - counterval[0];
301#endif
302	} while(0);
303
304	mips_timer_init_params(platform_counter_freq, 0);
305}
306