initial commit
[freebsd-arm:freebsd-arm.git] / arm / xscale / pxa / pxa_timer.c
1 /*-
2  * Copyright (c) 2006 Benno Rice.  All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23  */
24
25 #include <sys/cdefs.h>
26 __FBSDID("$FreeBSD$");
27
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/bus.h>
31 #include <sys/kernel.h>
32 #include <sys/module.h>
33 #include <sys/malloc.h>
34 #include <sys/rman.h>
35 #include <sys/timetc.h>
36 #include <machine/bus.h>
37 #include <machine/cpu.h>
38 #include <machine/frame.h>
39 #include <machine/intr.h>
40
41 #include <arm/xscale/pxa/pxavar.h>
42 #include <arm/xscale/pxa/pxareg.h>
43
44 #define PXA_TIMER_FREQUENCY     3686400
45 #define PXA_TIMER_TICK          (PXA_TIMER_FREQUENCY / hz)
46
47 struct pxa_timer_softc {
48         struct resource *       pt_res[5];
49         bus_space_tag_t         pt_bst;
50         bus_space_handle_t      pt_bsh;
51 };
52
53 static struct resource_spec pxa_timer_spec[] = {
54         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
55         { SYS_RES_IRQ,          0,      RF_ACTIVE },
56         { SYS_RES_IRQ,          1,      RF_ACTIVE },
57         { SYS_RES_IRQ,          2,      RF_ACTIVE },
58         { SYS_RES_IRQ,          3,      RF_ACTIVE },
59         { -1, 0 }
60 };
61
62 static struct pxa_timer_softc *timer_softc = NULL;
63
64 static int      pxa_timer_probe(device_t);
65 static int      pxa_timer_attach(device_t);
66
67 static driver_filter_t  pxa_hardclock;
68
69 static unsigned pxa_timer_get_timecount(struct timecounter *);
70
71 uint32_t        pxa_timer_get_osmr(int);
72 void            pxa_timer_set_osmr(int, uint32_t);
73 uint32_t        pxa_timer_get_oscr(void);
74 void            pxa_timer_set_oscr(uint32_t);
75 uint32_t        pxa_timer_get_ossr(void);
76 void            pxa_timer_clear_ossr(uint32_t);
77 void            pxa_timer_watchdog_enable(void);
78 void            pxa_timer_watchdog_disable(void);
79 void            pxa_timer_interrupt_enable(int);
80 void            pxa_timer_interrupt_disable(int);
81
82 static struct timecounter pxa_timer_timecounter = {
83         .tc_get_timecount = pxa_timer_get_timecount,
84         .tc_name = "OS Timer",
85         .tc_frequency = PXA_TIMER_FREQUENCY,
86         .tc_counter_mask = ~0u,
87         .tc_quality = 1000,
88 };
89
90 static int
91 pxa_timer_probe(device_t dev)
92 {
93
94         device_set_desc(dev, "OS Timer");
95         return (0);
96 }
97
98 static int
99 pxa_timer_attach(device_t dev)
100 {
101         int     error;
102         void    *ihl;
103         struct  pxa_timer_softc *sc;
104
105         sc = (struct pxa_timer_softc *)device_get_softc(dev);
106
107         if (timer_softc != NULL)
108                 return (ENXIO);
109
110         error = bus_alloc_resources(dev, pxa_timer_spec, sc->pt_res);
111         if (error) {
112                 device_printf(dev, "could not allocate resources\n");
113                 return (ENXIO);
114         }
115
116         sc->pt_bst = rman_get_bustag(sc->pt_res[0]);
117         sc->pt_bsh = rman_get_bushandle(sc->pt_res[0]);
118
119         timer_softc = sc;
120
121         pxa_timer_interrupt_disable(-1);
122         pxa_timer_watchdog_disable();
123
124         if (bus_setup_intr(dev, sc->pt_res[1], INTR_TYPE_CLK,
125             pxa_hardclock, NULL, NULL, &ihl) != 0) {
126                 bus_release_resources(dev, pxa_timer_spec, sc->pt_res);
127                 device_printf(dev, "could not setup hardclock interrupt\n");
128                 return (ENXIO);
129         }
130
131         return (0);
132 }
133
134 static int
135 pxa_hardclock(void *arg)
136 {
137         struct          trapframe *frame;
138
139         frame = (struct trapframe *)arg;
140
141         /* Clear the interrupt */
142         pxa_timer_clear_ossr(OST_SR_CH0);
143
144         /* Schedule next tick */
145         pxa_timer_set_osmr(0, pxa_timer_get_oscr() + PXA_TIMER_TICK);
146
147         /* Do what we came here for */
148         hardclock(TRAPF_USERMODE(frame), TRAPF_PC(frame));
149         
150         return (FILTER_HANDLED);
151 }
152
153 static device_method_t pxa_timer_methods[] = {
154         DEVMETHOD(device_probe, pxa_timer_probe),
155         DEVMETHOD(device_attach, pxa_timer_attach),
156
157         {0, 0}
158 };
159
160 static driver_t pxa_timer_driver = {
161         "timer",
162         pxa_timer_methods,
163         sizeof(struct pxa_timer_softc),
164 };
165
166 static devclass_t pxa_timer_devclass;
167
168 DRIVER_MODULE(pxatimer, pxa, pxa_timer_driver, pxa_timer_devclass, 0, 0);
169
170 static unsigned
171 pxa_timer_get_timecount(struct timecounter *tc)
172 {
173
174         return (pxa_timer_get_oscr());
175 }
176
177 void
178 cpu_initclocks(void)
179 {
180
181         pxa_timer_set_oscr(0);
182         pxa_timer_set_osmr(0, PXA_TIMER_TICK);
183         pxa_timer_interrupt_enable(0);
184
185         tc_init(&pxa_timer_timecounter);
186 }
187
188 void
189 cpu_reset(void)
190 {
191         uint32_t        val;
192
193         (void)disable_interrupts(I32_bit|F32_bit);
194
195         val = pxa_timer_get_oscr();
196         val += PXA_TIMER_FREQUENCY;
197         pxa_timer_set_osmr(3, val);
198         pxa_timer_watchdog_enable();
199
200         for(;;);
201 }
202
203 void
204 DELAY(int usec)
205 {
206         uint32_t        val;
207
208         if (timer_softc == NULL) {
209                 for (; usec > 0; usec--)
210                         for (val = 100; val > 0; val--)
211                                 ;
212                 return;
213         }
214
215         val = pxa_timer_get_oscr();
216         val += (PXA_TIMER_FREQUENCY * usec) / 1000000;
217         while (pxa_timer_get_oscr() <= val);
218 }
219
220 uint32_t
221 pxa_timer_get_osmr(int which)
222 {
223
224         return (bus_space_read_4(timer_softc->pt_bst,
225             timer_softc->pt_bsh, which * 0x4));
226 }
227
228 void
229 pxa_timer_set_osmr(int which, uint32_t val)
230 {
231
232         bus_space_write_4(timer_softc->pt_bst,
233             timer_softc->pt_bsh, which * 0x4, val);
234 }
235
236 uint32_t
237 pxa_timer_get_oscr()
238 {
239
240         return (bus_space_read_4(timer_softc->pt_bst,
241             timer_softc->pt_bsh, OST_CR));
242 }
243
244 void
245 pxa_timer_set_oscr(uint32_t val)
246 {
247
248         bus_space_write_4(timer_softc->pt_bst,
249             timer_softc->pt_bsh, OST_CR, val);
250 }
251
252 uint32_t
253 pxa_timer_get_ossr()
254 {
255
256         return (bus_space_read_4(timer_softc->pt_bst,
257             timer_softc->pt_bsh, OST_SR));
258 }
259
260 void
261 pxa_timer_clear_ossr(uint32_t val)
262 {
263
264         bus_space_write_4(timer_softc->pt_bst,
265             timer_softc->pt_bsh, OST_SR, val);
266 }
267
268 void
269 pxa_timer_watchdog_enable()
270 {
271
272         bus_space_write_4(timer_softc->pt_bst,
273             timer_softc->pt_bsh, OST_WR, 0x1);
274 }
275
276 void
277 pxa_timer_watchdog_disable()    
278 {
279
280         bus_space_write_4(timer_softc->pt_bst,
281             timer_softc->pt_bsh, OST_WR, 0x0);
282 }
283
284 void
285 pxa_timer_interrupt_enable(int which)
286 {
287         uint32_t        oier;
288
289         if (which == -1) {
290                 bus_space_write_4(timer_softc->pt_bst,
291                     timer_softc->pt_bsh, OST_IR, 0xf);
292                 return;
293         }
294
295         oier = bus_space_read_4(timer_softc->pt_bst,
296             timer_softc->pt_bsh, OST_IR);
297         oier |= 1 << which;
298         bus_space_write_4(timer_softc->pt_bst,
299             timer_softc->pt_bsh, OST_IR, oier);
300 }
301
302 void
303 pxa_timer_interrupt_disable(int which)
304 {
305         uint32_t        oier;
306
307         if (which == -1) {
308                 bus_space_write_4(timer_softc->pt_bst,
309                     timer_softc->pt_bsh, OST_IR, 0);
310         }
311
312         oier = bus_space_read_4(timer_softc->pt_bst,
313             timer_softc->pt_bsh, OST_IR);
314         oier &= ~(1 << which);
315         bus_space_write_4(timer_softc->pt_bst,
316             timer_softc->pt_bsh, OST_IR, oier);
317 }