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: releng/11.0/sys/arm/xscale/ixp425/ixp425_timer.c 271398 2014-09-10 15:25:15Z andrew $");
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/cpufunc.h>
53#include <machine/frame.h>
54#include <machine/resource.h>
55#include <machine/intr.h>
56#include <arm/xscale/ixp425/ixp425reg.h>
57#include <arm/xscale/ixp425/ixp425var.h>
58
59static uint32_t counts_per_hz;
60
61/* callback functions for intr_functions */
62int	ixpclk_intr(void *);
63
64struct ixpclk_softc {
65	device_t		sc_dev;
66	bus_addr_t		sc_baseaddr;
67	bus_space_tag_t		sc_iot;
68	bus_space_handle_t      sc_ioh;
69};
70
71static unsigned ixp425_timer_get_timecount(struct timecounter *tc);
72
73#ifndef IXP425_CLOCK_FREQ
74#define	COUNTS_PER_SEC		66666600	/* 66MHz */
75#else
76#define	COUNTS_PER_SEC		IXP425_CLOCK_FREQ
77#endif
78#define	COUNTS_PER_USEC		((COUNTS_PER_SEC / 1000000) + 1)
79
80static struct ixpclk_softc *ixpclk_sc = NULL;
81
82#define GET_TS_VALUE(sc)	(*(volatile u_int32_t *) \
83				  (IXP425_TIMER_VBASE + IXP425_OST_TS))
84
85static struct timecounter ixp425_timer_timecounter = {
86	ixp425_timer_get_timecount,	/* get_timecount */
87	NULL, 				/* no poll_pps */
88	~0u, 				/* counter_mask */
89	COUNTS_PER_SEC,			/* frequency */
90	"IXP4XX Timer", 		/* name */
91	1000,				/* quality */
92};
93
94static int
95ixpclk_probe(device_t dev)
96{
97	device_set_desc(dev, "IXP4XX Timer");
98	return (0);
99}
100
101static int
102ixpclk_attach(device_t dev)
103{
104	struct ixpclk_softc *sc = device_get_softc(dev);
105	struct ixp425_softc *sa = device_get_softc(device_get_parent(dev));
106
107	ixpclk_sc = sc;
108
109	sc->sc_dev = dev;
110	sc->sc_iot = sa->sc_iot;
111	sc->sc_baseaddr = IXP425_TIMER_HWBASE;
112
113	if (bus_space_map(sc->sc_iot, sc->sc_baseaddr, 8, 0,
114			  &sc->sc_ioh))
115		panic("%s: Cannot map registers", device_get_name(dev));
116
117	return (0);
118}
119
120static device_method_t ixpclk_methods[] = {
121	DEVMETHOD(device_probe, ixpclk_probe),
122	DEVMETHOD(device_attach, ixpclk_attach),
123	{0, 0},
124};
125
126static driver_t ixpclk_driver = {
127	"ixpclk",
128	ixpclk_methods,
129	sizeof(struct ixpclk_softc),
130};
131static devclass_t ixpclk_devclass;
132
133DRIVER_MODULE(ixpclk, ixp, ixpclk_driver, ixpclk_devclass, 0, 0);
134static unsigned
135ixp425_timer_get_timecount(struct timecounter *tc)
136{
137	uint32_t ret;
138
139	ret = GET_TS_VALUE(sc);
140	return (ret);
141}
142
143/*
144 * cpu_initclocks:
145 *
146 *	Initialize the clock and get them going.
147 */
148void
149cpu_initclocks(void)
150{
151	struct ixpclk_softc* sc = ixpclk_sc;
152	struct resource *irq;
153	device_t dev = sc->sc_dev;
154	u_int oldirqstate;
155	int rid = 0;
156	void *ihl;
157
158	if (hz < 50 || COUNTS_PER_SEC % hz) {
159		printf("Cannot get %d Hz clock; using 100 Hz\n", hz);
160		hz = 100;
161	}
162	tick = 1000000 / hz;	/* number of microseconds between interrupts */
163
164	/*
165	 * We only have one timer available; stathz and profhz are
166	 * always left as 0 (the upper-layer clock code deals with
167	 * this situation).
168	 */
169	if (stathz != 0)
170		printf("Cannot get %d Hz statclock\n", stathz);
171	stathz = 0;
172
173	if (profhz != 0)
174		printf("Cannot get %d Hz profclock\n", profhz);
175	profhz = 0;
176
177	/* Report the clock frequency. */
178
179	oldirqstate = disable_interrupts(PSR_I);
180
181	irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, IXP425_INT_TMR0,
182	    IXP425_INT_TMR0, 1, RF_ACTIVE);
183	if (!irq)
184		panic("Unable to setup the clock irq handler.\n");
185	else
186		bus_setup_intr(dev, irq, INTR_TYPE_CLK, ixpclk_intr, NULL,
187		    NULL, &ihl);
188
189	/* Set up the new clock parameters. */
190
191	/* clear interrupt */
192	bus_space_write_4(sc->sc_iot, sc->sc_ioh, IXP425_OST_STATUS,
193			  OST_WARM_RESET | OST_WDOG_INT | OST_TS_INT |
194			  OST_TIM1_INT | OST_TIM0_INT);
195
196	counts_per_hz = COUNTS_PER_SEC / hz;
197
198	/* reload value & Timer enable */
199	bus_space_write_4(sc->sc_iot, sc->sc_ioh, IXP425_OST_TIM0_RELOAD,
200			  (counts_per_hz & TIMERRELOAD_MASK) | OST_TIMER_EN);
201
202	tc_init(&ixp425_timer_timecounter);
203	restore_interrupts(oldirqstate);
204	rid = 0;
205}
206
207
208/*
209 * DELAY:
210 *
211 *	Delay for at least N microseconds.
212 */
213void
214DELAY(int n)
215{
216	u_int32_t first, last;
217	int usecs;
218
219	if (n == 0)
220		return;
221
222	/*
223	 * Clamp the timeout at a maximum value (about 32 seconds with
224	 * a 66MHz clock). *Nobody* should be delay()ing for anywhere
225	 * near that length of time and if they are, they should be hung
226	 * out to dry.
227	 */
228	if (n >= (0x80000000U / COUNTS_PER_USEC))
229		usecs = (0x80000000U / COUNTS_PER_USEC) - 1;
230	else
231		usecs = n * COUNTS_PER_USEC;
232
233	/* Note: Timestamp timer counts *up*, unlike the other timers */
234	first = GET_TS_VALUE();
235
236	while (usecs > 0) {
237		last = GET_TS_VALUE();
238		usecs -= (int)(last - first);
239		first = last;
240	}
241}
242
243/*
244 * ixpclk_intr:
245 *
246 *	Handle the hardclock interrupt.
247 */
248int
249ixpclk_intr(void *arg)
250{
251	struct ixpclk_softc* sc = ixpclk_sc;
252	struct trapframe *frame = arg;
253
254	bus_space_write_4(sc->sc_iot, sc->sc_ioh, IXP425_OST_STATUS,
255			  OST_TIM0_INT);
256
257	hardclock(TRAPF_USERMODE(frame), TRAPF_PC(frame));
258	return (FILTER_HANDLED);
259}
260
261void
262cpu_startprofclock(void)
263{
264}
265
266void
267cpu_stopprofclock(void)
268{
269}
270