malta_machdep.c revision 202849 
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 202849 2010-01-23 00:18:12Z imp $
27 */
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: head/sys/mips/malta/malta_machdep.c 202849 2010-01-23 00:18:12Z imp $");
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
100void
101platform_cpu_init()
102{
103	/* Nothing special */
104}
105
106/*
107 * Put character to Malta LCD at given position.
108 */
109static void
110malta_lcd_putc(int pos, char c)
111{
112	void *addr;
113	char *ch;
114
115	if (pos < 0 || pos > 7)
116		return;
117	addr = (void *)(MALTA_ASCII_BASE + malta_lcd_offs[pos]);
118	ch = (char *)MIPS_PHYS_TO_KSEG0(addr);
119	*ch = c;
120}
121
122/*
123 * Print given string on LCD.
124 */
125static void
126malta_lcd_print(char *str)
127{
128	int i;
129
130	if (str == NULL)
131		return;
132
133	for (i = 0; *str != '\0'; i++, str++)
134		malta_lcd_putc(i, *str);
135}
136
137void
138lcd_init(void)
139{
140	malta_lcd_print("FreeBSD_");
141}
142
143void
144lcd_puts(char *s)
145{
146	malta_lcd_print(s);
147}
148
149#ifdef TICK_USE_MALTA_RTC
150static __inline uint8_t
151rtcin(uint8_t addr)
152{
153
154	*((volatile uint8_t *)
155	    MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
156	return (*((volatile uint8_t *)
157	    MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))));
158}
159
160static __inline void
161writertc(uint8_t addr, uint8_t val)
162{
163
164	*((volatile uint8_t *)
165	    MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCADR))) = addr;
166	*((volatile uint8_t *)
167	    MIPS_PHYS_TO_KSEG1(MALTA_PCI0_ADDR(MALTA_RTCDAT))) = val;
168}
169#endif
170
171static void
172mips_init(void)
173{
174	int i;
175
176	for (i = 0; i < 10; i++) {
177		phys_avail[i] = 0;
178	}
179
180	/* phys_avail regions are in bytes */
181	phys_avail[0] = MIPS_KSEG0_TO_PHYS((vm_offset_t)&end);
182	phys_avail[1] = ctob(realmem);
183
184	physmem = realmem;
185
186	init_param1();
187	init_param2(physmem);
188	mips_cpu_init();
189	pmap_bootstrap();
190	mips_proc0_init();
191	mutex_init();
192	kdb_init();
193#ifdef KDB
194	if (boothowto & RB_KDB)
195		kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
196#endif
197}
198
199void
200platform_halt(void)
201{
202
203}
204
205
206void
207platform_identify(void)
208{
209
210}
211
212/*
213 * Perform a board-level soft-reset.
214 * Note that this is not emulated by gxemul.
215 */
216void
217platform_reset(void)
218{
219	char *c;
220
221	c = (char *)MIPS_PHYS_TO_KSEG0(MALTA_SOFTRES);
222	*c = MALTA_GORESET;
223}
224
225void
226platform_trap_enter(void)
227{
228
229}
230
231void
232platform_trap_exit(void)
233{
234
235}
236
237static uint64_t
238malta_cpu_freq(void)
239{
240	uint64_t platform_counter_freq = 0;
241
242#if defined(TICK_USE_YAMON_FREQ)
243	/*
244	 * If we are running on a board which uses YAMON firmware,
245	 * then query CPU pipeline clock from the syscon object.
246	 * If unsuccessful, use hard-coded default.
247	 */
248	platform_counter_freq = yamon_getcpufreq();
249
250#elif defined(TICK_USE_MALTA_RTC)
251	/*
252	 * If we are running on a board with the MC146818 RTC,
253	 * use it to determine CPU pipeline clock frequency.
254	 */
255	u_int64_t counterval[2];
256
257	/* Set RTC to binary mode. */
258	writertc(RTC_STATUSB, (rtcin(RTC_STATUSB) | RTCSB_BCD));
259
260	/* Busy-wait for falling edge of RTC update. */
261	while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
262		;
263	while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
264		;
265	counterval[0] = mips_rd_count();
266
267	/* Busy-wait for falling edge of RTC update. */
268	while (((rtcin(RTC_STATUSA) & RTCSA_TUP) == 0))
269		;
270	while (((rtcin(RTC_STATUSA)& RTCSA_TUP) != 0))
271		;
272	counterval[1] = mips_rd_count();
273
274	platform_counter_freq = counterval[1] - counterval[0];
275#endif
276
277	if (platform_counter_freq == 0)
278		platform_counter_freq = MIPS_DEFAULT_HZ;
279
280	return (platform_counter_freq);
281}
282
283void
284platform_start(__register_t a0, __register_t a1,  __register_t a2,
285    __register_t a3)
286{
287	vm_offset_t kernend;
288	uint64_t platform_counter_freq;
289	int argc = a0;
290	char **argv = (char **)a1;
291	char **envp = (char **)a2;
292	unsigned int memsize = a3;
293	int i;
294
295	/* clear the BSS and SBSS segments */
296	kernend = round_page((vm_offset_t)&end);
297	memset(&edata, 0, kernend - (vm_offset_t)(&edata));
298
299	mips_pcpu0_init();
300	platform_counter_freq = malta_cpu_freq();
301	mips_timer_early_init(platform_counter_freq);
302
303	cninit();
304	printf("entry: platform_start()\n");
305
306	bootverbose = 1;
307	if (bootverbose) {
308		printf("cmd line: ");
309		for (i = 0; i < argc; i++)
310			printf("%s ", argv[i]);
311		printf("\n");
312
313		printf("envp:\n");
314		for (i = 0; envp[i]; i += 2)
315			printf("\t%s = %s\n", envp[i], envp[i+1]);
316
317		printf("memsize = %08x\n", memsize);
318	}
319
320	realmem = btoc(memsize);
321	mips_init();
322
323	mips_timer_init_params(platform_counter_freq, 0);
324}
325