malta_machdep.c revision 249589 
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 249589 2013-04-17 18:26:01Z adrian $
27 */
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: head/sys/mips/malta/malta_machdep.c 249589 2013-04-17 18:26:01Z adrian $");
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
58#include <machine/clock.h>
59#include <machine/cpu.h>
60#include <machine/cpuregs.h>
61#include <machine/hwfunc.h>
62#include <machine/md_var.h>
63#include <machine/pmap.h>
64#include <machine/trap.h>
65
66#ifdef TICK_USE_YAMON_FREQ
67#include <mips/malta/yamon.h>
68#endif
69
70#ifdef TICK_USE_MALTA_RTC
71#include <mips/mips4k/malta/maltareg.h>
72#include <dev/mc146818/mc146818reg.h>
73#include <isa/rtc.h>
74#endif
75
76#include <mips/malta/maltareg.h>
77
78extern int	*edata;
79extern int	*end;
80
81void	lcd_init(void);
82void	lcd_puts(char *);
83void	malta_reset(void);
84
85/*
86 * Temporary boot environment used at startup.
87 */
88static char boot1_env[4096];
89
90/*
91 * Offsets to MALTA LCD characters.
92 */
93static int malta_lcd_offs[] = {
94	MALTA_ASCIIPOS0,
95	MALTA_ASCIIPOS1,
96	MALTA_ASCIIPOS2,
97	MALTA_ASCIIPOS3,
98	MALTA_ASCIIPOS4,
99	MALTA_ASCIIPOS5,
100	MALTA_ASCIIPOS6,
101	MALTA_ASCIIPOS7
102};
103
104void
105platform_cpu_init()
106{
107	/* Nothing special */
108}
109
110/*
111 * Put character to Malta LCD at given position.
112 */
113static void
114malta_lcd_putc(int pos, char c)
115{
116	void *addr;
117	char *ch;
118
119	if (pos < 0 || pos > 7)
120		return;
121	addr = (void *)(MALTA_ASCII_BASE + malta_lcd_offs[pos]);
122	ch = (char *)MIPS_PHYS_TO_KSEG0(addr);
123	*ch = c;
124}
125
126/*
127 * Print given string on LCD.
128 */
129static void
130malta_lcd_print(char *str)
131{
132	int i;
133
134	if (str == NULL)
135		return;
136
137	for (i = 0; *str != '\0'; i++, str++)
138		malta_lcd_putc(i, *str);
139}
140
141void
142lcd_init(void)
143{
144	malta_lcd_print("FreeBSD_");
145}
146
147void
148lcd_puts(char *s)
149{
150	malta_lcd_print(s);
151}
152
153#ifdef TICK_USE_MALTA_RTC
154static __inline uint8_t
155rtcin(uint8_t addr)
156{
157
158	*((volatile uint8_t *)
159	    MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
160	return (*((volatile uint8_t *)
161	    MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))));
162}
163
164static __inline void
165writertc(uint8_t addr, uint8_t val)
166{
167
168	*((volatile uint8_t *)
169	    MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
170	*((volatile uint8_t *)
171	    MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))) = val;
172}
173#endif
174
175static void
176mips_init(void)
177{
178	int i;
179
180	for (i = 0; i < 10; i++) {
181		phys_avail[i] = 0;
182	}
183
184	/* phys_avail regions are in bytes */
185	phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
186	phys_avail[1] = ctob(realmem);
187
188	dump_avail[0] = phys_avail[0];
189	dump_avail[1] = phys_avail[1];
190
191	physmem = realmem;
192
193	init_param1();
194	init_param2(physmem);
195	mips_cpu_init();
196	pmap_bootstrap();
197	mips_proc0_init();
198	mutex_init();
199	kdb_init();
200#ifdef KDB
201	if (boothowto & RB_KDB)
202		kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
203#endif
204}
205
206/*
207 * Perform a board-level soft-reset.
208 * Note that this is not emulated by gxemul.
209 */
210void
211platform_reset(void)
212{
213	char *c;
214
215	c = (char *)MIPS_PHYS_TO_KSEG0(MALTA_SOFTRES);
216	*c = MALTA_GORESET;
217}
218
219static uint64_t
220malta_cpu_freq(void)
221{
222	uint64_t platform_counter_freq = 0;
223
224#if defined(TICK_USE_YAMON_FREQ)
225	/*
226	 * If we are running on a board which uses YAMON firmware,
227	 * then query CPU pipeline clock from the syscon object.
228	 * If unsuccessful, use hard-coded default.
229	 */
230	platform_counter_freq = yamon_getcpufreq();
231
232#elif defined(TICK_USE_MALTA_RTC)
233	/*
234	 * If we are running on a board with the MC146818 RTC,
235	 * use it to determine CPU pipeline clock frequency.
236	 */
237	u_int64_t counterval[2];
238
239	/* Set RTC to binary mode. */
240	writertc(RTC_STATUSB, (rtcin(RTC_STATUSB) | RTCSB_BCD));
241
242	/* Busy-wait for falling edge of RTC update. */
243	while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
244		;
245	while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
246		;
247	counterval[0] = mips_rd_count();
248
249	/* Busy-wait for falling edge of RTC update. */
250	while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
251		;
252	while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
253		;
254	counterval[1] = mips_rd_count();
255
256	platform_counter_freq = counterval[1] - counterval[0];
257#endif
258
259	if (platform_counter_freq == 0)
260		platform_counter_freq = MIPS_DEFAULT_HZ;
261
262	return (platform_counter_freq);
263}
264
265void
266platform_start(__register_t a0, __register_t a1,  __register_t a2,
267    __register_t a3)
268{
269	vm_offset_t kernend;
270	uint64_t platform_counter_freq;
271	int argc = a0;
272	char **argv = (char **)a1;
273	char **envp = (char **)a2;
274	unsigned int memsize = a3;
275	int i;
276
277	/* clear the BSS and SBSS segments */
278	kernend = (vm_offset_t)&end;
279	memset(&edata, 0, kernend - (vm_offset_t)(&edata));
280
281	mips_postboot_fixup();
282
283	mips_pcpu0_init();
284	platform_counter_freq = malta_cpu_freq();
285	mips_timer_early_init(platform_counter_freq);
286	init_static_kenv(boot1_env, sizeof(boot1_env));
287
288	cninit();
289	printf("entry: platform_start()\n");
290
291	bootverbose = 1;
292	if (bootverbose) {
293		printf("cmd line: ");
294		for (i = 0; i < argc; i++)
295			printf("%s ", argv[i]);
296		printf("\n");
297
298		printf("envp:\n");
299		for (i = 0; envp[i]; i += 2)
300			printf("\t%s = %s\n", envp[i], envp[i+1]);
301
302		printf("memsize = %08x\n", memsize);
303	}
304
305	realmem = btoc(memsize);
306	mips_init();
307
308	mips_timer_init_params(platform_counter_freq, 0);
309}
310