ixp425_timer.c revision 331722 
1/*	$NetBSD: ixp425_timer.c,v 1.11 2006/04/10 03:36:03 simonb Exp $ */
2
3/*
4 * Copyright (c) 2003
5 *	Ichiro FUKUHARA <ichiro@ichiro.org>.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by Ichiro FUKUHARA.
19 * 4. The name of the company nor the name of the author may be used to
20 *    endorse or promote products derived from this software without specific
21 *    prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY ICHIRO FUKUHARA ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL ICHIRO FUKUHARA OR THE VOICES IN HIS HEAD BE LIABLE FOR
27 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: stable/11/sys/arm/xscale/ixp425/ixp425_timer.c 331722 2018-03-29 02:50:57Z eadler $");
38
39#include <sys/param.h>
40#include <sys/systm.h>
41#include <sys/kernel.h>
42#include <sys/module.h>
43#include <sys/time.h>
44#include <sys/bus.h>
45#include <sys/resource.h>
46#include <sys/rman.h>
47#include <sys/timetc.h>
48
49#include <machine/armreg.h>
50#include <machine/bus.h>
51#include <machine/cpu.h>
52#include <machine/frame.h>
53#include <machine/resource.h>
54#include <machine/intr.h>
55#include <arm/xscale/ixp425/ixp425reg.h>
56#include <arm/xscale/ixp425/ixp425var.h>
57
58static uint32_t counts_per_hz;
59
60/* callback functions for intr_functions */
61int	ixpclk_intr(void *);
62
63struct ixpclk_softc {
64	device_t		sc_dev;
65	bus_addr_t		sc_baseaddr;
66	bus_space_tag_t		sc_iot;
67	bus_space_handle_t      sc_ioh;
68};
69
70static unsigned ixp425_timer_get_timecount(struct timecounter *tc);
71
72#ifndef IXP425_CLOCK_FREQ
73#define	COUNTS_PER_SEC		66666600	/* 66MHz */
74#else
75#define	COUNTS_PER_SEC		IXP425_CLOCK_FREQ
76#endif
77#define	COUNTS_PER_USEC		((COUNTS_PER_SEC / 1000000) + 1)
78
79static struct ixpclk_softc *ixpclk_sc = NULL;
80
81#define GET_TS_VALUE(sc)	(*(volatile u_int32_t *) \
82				  (IXP425_TIMER_VBASE + IXP425_OST_TS))
83
84static struct timecounter ixp425_timer_timecounter = {
85	ixp425_timer_get_timecount,	/* get_timecount */
86	NULL, 				/* no poll_pps */
87	~0u, 				/* counter_mask */
88	COUNTS_PER_SEC,			/* frequency */
89	"IXP4XX Timer", 		/* name */
90	1000,				/* quality */
91};
92
93static int
94ixpclk_probe(device_t dev)
95{
96	device_set_desc(dev, "IXP4XX Timer");
97	return (0);
98}
99
100static int
101ixpclk_attach(device_t dev)
102{
103	struct ixpclk_softc *sc = device_get_softc(dev);
104	struct ixp425_softc *sa = device_get_softc(device_get_parent(dev));
105
106	ixpclk_sc = sc;
107
108	sc->sc_dev = dev;
109	sc->sc_iot = sa->sc_iot;
110	sc->sc_baseaddr = IXP425_TIMER_HWBASE;
111
112	if (bus_space_map(sc->sc_iot, sc->sc_baseaddr, 8, 0,
113			  &sc->sc_ioh))
114		panic("%s: Cannot map registers", device_get_name(dev));
115
116	return (0);
117}
118
119static device_method_t ixpclk_methods[] = {
120	DEVMETHOD(device_probe, ixpclk_probe),
121	DEVMETHOD(device_attach, ixpclk_attach),
122	{0, 0},
123};
124
125static driver_t ixpclk_driver = {
126	"ixpclk",
127	ixpclk_methods,
128	sizeof(struct ixpclk_softc),
129};
130static devclass_t ixpclk_devclass;
131
132DRIVER_MODULE(ixpclk, ixp, ixpclk_driver, ixpclk_devclass, 0, 0);
133static unsigned
134ixp425_timer_get_timecount(struct timecounter *tc)
135{
136	uint32_t ret;
137
138	ret = GET_TS_VALUE(sc);
139	return (ret);
140}
141
142/*
143 * cpu_initclocks:
144 *
145 *	Initialize the clock and get them going.
146 */
147void
148cpu_initclocks(void)
149{
150	struct ixpclk_softc* sc = ixpclk_sc;
151	struct resource *irq;
152	device_t dev = sc->sc_dev;
153	u_int oldirqstate;
154	int rid = 0;
155	void *ihl;
156
157	if (hz < 50 || COUNTS_PER_SEC % hz) {
158		printf("Cannot get %d Hz clock; using 100 Hz\n", hz);
159		hz = 100;
160	}
161	tick = 1000000 / hz;	/* number of microseconds between interrupts */
162
163	/*
164	 * We only have one timer available; stathz and profhz are
165	 * always left as 0 (the upper-layer clock code deals with
166	 * this situation).
167	 */
168	if (stathz != 0)
169		printf("Cannot get %d Hz statclock\n", stathz);
170	stathz = 0;
171
172	if (profhz != 0)
173		printf("Cannot get %d Hz profclock\n", profhz);
174	profhz = 0;
175
176	/* Report the clock frequency. */
177
178	oldirqstate = disable_interrupts(PSR_I);
179
180	irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, IXP425_INT_TMR0,
181	    IXP425_INT_TMR0, 1, RF_ACTIVE);
182	if (!irq)
183		panic("Unable to setup the clock irq handler.\n");
184	else
185		bus_setup_intr(dev, irq, INTR_TYPE_CLK, ixpclk_intr, NULL,
186		    NULL, &ihl);
187
188	/* Set up the new clock parameters. */
189
190	/* clear interrupt */
191	bus_space_write_4(sc->sc_iot, sc->sc_ioh, IXP425_OST_STATUS,
192			  OST_WARM_RESET | OST_WDOG_INT | OST_TS_INT |
193			  OST_TIM1_INT | OST_TIM0_INT);
194
195	counts_per_hz = COUNTS_PER_SEC / hz;
196
197	/* reload value & Timer enable */
198	bus_space_write_4(sc->sc_iot, sc->sc_ioh, IXP425_OST_TIM0_RELOAD,
199			  (counts_per_hz & TIMERRELOAD_MASK) | OST_TIMER_EN);
200
201	tc_init(&ixp425_timer_timecounter);
202	restore_interrupts(oldirqstate);
203	rid = 0;
204}
205
206
207/*
208 * DELAY:
209 *
210 *	Delay for at least N microseconds.
211 */
212void
213DELAY(int n)
214{
215	u_int32_t first, last;
216	int usecs;
217
218	if (n == 0)
219		return;
220
221	/*
222	 * Clamp the timeout at a maximum value (about 32 seconds with
223	 * a 66MHz clock). *Nobody* should be delay()ing for anywhere
224	 * near that length of time and if they are, they should be hung
225	 * out to dry.
226	 */
227	if (n >= (0x80000000U / COUNTS_PER_USEC))
228		usecs = (0x80000000U / COUNTS_PER_USEC) - 1;
229	else
230		usecs = n * COUNTS_PER_USEC;
231
232	/* Note: Timestamp timer counts *up*, unlike the other timers */
233	first = GET_TS_VALUE();
234
235	while (usecs > 0) {
236		last = GET_TS_VALUE();
237		usecs -= (int)(last - first);
238		first = last;
239	}
240}
241
242/*
243 * ixpclk_intr:
244 *
245 *	Handle the hardclock interrupt.
246 */
247int
248ixpclk_intr(void *arg)
249{
250	struct ixpclk_softc* sc = ixpclk_sc;
251	struct trapframe *frame = arg;
252
253	bus_space_write_4(sc->sc_iot, sc->sc_ioh, IXP425_OST_STATUS,
254			  OST_TIM0_INT);
255
256	hardclock(TRAPF_USERMODE(frame), TRAPF_PC(frame));
257	return (FILTER_HANDLED);
258}
259
260void
261cpu_startprofclock(void)
262{
263}
264
265void
266cpu_stopprofclock(void)
267{
268}
269