1/*
2 * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
3 * Copyright (c) 2012 Damjan Marion <dmarion@freebsd.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
| 1/*
2 * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
3 * Copyright (c) 2012 Damjan Marion <dmarion@freebsd.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
|
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/bus.h>
34#include <sys/kernel.h>
35#include <sys/module.h>
36#include <sys/malloc.h>
37#include <sys/rman.h>
38#include <sys/timeet.h>
39#include <sys/timetc.h>
40#include <sys/watchdog.h>
41#include <machine/bus.h>
42#include <machine/cpu.h>
43#include <machine/intr.h>
44
45#include <dev/fdt/fdt_common.h>
46#include <dev/ofw/openfirm.h>
47#include <dev/ofw/ofw_bus.h>
48#include <dev/ofw/ofw_bus_subr.h>
49
50#include <machine/bus.h>
51#include <machine/fdt.h>
52
53#define BCM2835_NUM_TIMERS 4
54
55#define DEFAULT_TIMER 3
56#define DEFAULT_FREQUENCY 1000000
57#define MIN_PERIOD 5LLU
58
59#define SYSTIMER_CS 0x00
60#define SYSTIMER_CLO 0x04
61#define SYSTIMER_CHI 0x08
62#define SYSTIMER_C0 0x0C
63#define SYSTIMER_C1 0x10
64#define SYSTIMER_C2 0x14
65#define SYSTIMER_C3 0x18
66
67struct systimer {
68 int index;
69 bool enabled;
70 struct eventtimer et;
71};
72
73struct bcm_systimer_softc {
74 struct resource* mem_res;
75 struct resource* irq_res[BCM2835_NUM_TIMERS];
76 void* intr_hl[BCM2835_NUM_TIMERS];
77 uint32_t sysclk_freq;
78 bus_space_tag_t bst;
79 bus_space_handle_t bsh;
80 struct systimer st[BCM2835_NUM_TIMERS];
81};
82
83static struct resource_spec bcm_systimer_irq_spec[] = {
84 { SYS_RES_IRQ, 0, RF_ACTIVE },
85 { SYS_RES_IRQ, 1, RF_ACTIVE },
86 { SYS_RES_IRQ, 2, RF_ACTIVE },
87 { SYS_RES_IRQ, 3, RF_ACTIVE },
88 { -1, 0, 0 }
89};
90
91static struct bcm_systimer_softc *bcm_systimer_sc = NULL;
92
93/* Read/Write macros for Timer used as timecounter */
94#define bcm_systimer_tc_read_4(reg) \
95 bus_space_read_4(bcm_systimer_sc->bst, \
96 bcm_systimer_sc->bsh, reg)
97
98#define bcm_systimer_tc_write_4(reg, val) \
99 bus_space_write_4(bcm_systimer_sc->bst, \
100 bcm_systimer_sc->bsh, reg, val)
101
102static unsigned bcm_systimer_tc_get_timecount(struct timecounter *);
103
104static struct timecounter bcm_systimer_tc = {
105 .tc_name = "BCM2835 Timecounter",
106 .tc_get_timecount = bcm_systimer_tc_get_timecount,
107 .tc_poll_pps = NULL,
108 .tc_counter_mask = ~0u,
109 .tc_frequency = 0,
110 .tc_quality = 1000,
111};
112
113static unsigned
114bcm_systimer_tc_get_timecount(struct timecounter *tc)
115{
116 return bcm_systimer_tc_read_4(SYSTIMER_CLO);
117}
118
119static int
120bcm_systimer_start(struct eventtimer *et, sbintime_t first, sbintime_t period)
121{
122 struct systimer *st = et->et_priv;
123 uint32_t clo, clo1;
124 uint32_t count;
125 register_t s;
126
127 if (first != 0) {
128
129 count = ((uint32_t)et->et_frequency * first) >> 32;
130
131 s = intr_disable();
132 clo = bcm_systimer_tc_read_4(SYSTIMER_CLO);
133restart:
134 clo += count;
135 /*
136 * Clear pending interrupts
137 */
138 bcm_systimer_tc_write_4(SYSTIMER_CS, (1 << st->index));
139 bcm_systimer_tc_write_4(SYSTIMER_C0 + st->index*4, clo);
140 clo1 = bcm_systimer_tc_read_4(SYSTIMER_CLO);
141 if ((int32_t)(clo1 - clo) >= 0) {
142 count *= 2;
143 clo = clo1;
144 goto restart;
145 }
146 st->enabled = 1;
147 intr_restore(s);
148
149 return (0);
150 }
151
152 return (EINVAL);
153}
154
155static int
156bcm_systimer_stop(struct eventtimer *et)
157{
158 struct systimer *st = et->et_priv;
159 st->enabled = 0;
160
161 return (0);
162}
163
164static int
165bcm_systimer_intr(void *arg)
166{
167 struct systimer *st = (struct systimer *)arg;
168 uint32_t cs;
169
170 cs = bcm_systimer_tc_read_4(SYSTIMER_CS);
171 if ((cs & (1 << st->index)) == 0)
172 return (FILTER_STRAY);
173
174 /* ACK interrupt */
175 bcm_systimer_tc_write_4(SYSTIMER_CS, (1 << st->index));
176 if (st->enabled) {
177 if (st->et.et_active) {
178 st->et.et_event_cb(&st->et, st->et.et_arg);
179 }
180 }
181
182 return (FILTER_HANDLED);
183}
184
185static int
186bcm_systimer_probe(device_t dev)
187{
188
189 if (!ofw_bus_status_okay(dev))
190 return (ENXIO);
191
192 if (ofw_bus_is_compatible(dev, "broadcom,bcm2835-system-timer")) {
193 device_set_desc(dev, "BCM2835 System Timer");
194 return (BUS_PROBE_DEFAULT);
195 }
196
197 return (ENXIO);
198}
199
200static int
201bcm_systimer_attach(device_t dev)
202{
203 struct bcm_systimer_softc *sc = device_get_softc(dev);
204 int err;
205 int rid = 0;
206
207 if (bcm_systimer_sc != NULL)
208 return (EINVAL);
209
210 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
211 if (sc->mem_res == NULL) {
212 device_printf(dev, "could not allocate memory resource\n");
213 return (ENXIO);
214 }
215
216 sc->bst = rman_get_bustag(sc->mem_res);
217 sc->bsh = rman_get_bushandle(sc->mem_res);
218
219 /* Request the IRQ resources */
220 err = bus_alloc_resources(dev, bcm_systimer_irq_spec,
221 sc->irq_res);
222 if (err) {
223 device_printf(dev, "Error: could not allocate irq resources\n");
224 return (ENXIO);
225 }
226
227 /* TODO: get frequency from FDT */
228 sc->sysclk_freq = DEFAULT_FREQUENCY;
229
230 /* Setup and enable the timer */
231 if (bus_setup_intr(dev, sc->irq_res[DEFAULT_TIMER], INTR_TYPE_CLK,
232 bcm_systimer_intr, NULL, &sc->st[DEFAULT_TIMER],
233 &sc->intr_hl[DEFAULT_TIMER]) != 0) {
234 bus_release_resources(dev, bcm_systimer_irq_spec,
235 sc->irq_res);
236 device_printf(dev, "Unable to setup the clock irq handler.\n");
237 return (ENXIO);
238 }
239
240 sc->st[DEFAULT_TIMER].index = DEFAULT_TIMER;
241 sc->st[DEFAULT_TIMER].enabled = 0;
242 sc->st[DEFAULT_TIMER].et.et_name = malloc(64, M_DEVBUF, M_NOWAIT | M_ZERO);
243 sprintf(sc->st[DEFAULT_TIMER].et.et_name, "BCM2835 Event Timer %d", DEFAULT_TIMER);
244 sc->st[DEFAULT_TIMER].et.et_flags = ET_FLAGS_ONESHOT;
245 sc->st[DEFAULT_TIMER].et.et_quality = 1000;
246 sc->st[DEFAULT_TIMER].et.et_frequency = sc->sysclk_freq;
247 sc->st[DEFAULT_TIMER].et.et_min_period =
248 (MIN_PERIOD << 32) / sc->st[DEFAULT_TIMER].et.et_frequency + 1;
249 sc->st[DEFAULT_TIMER].et.et_max_period =
250 (0x7ffffffeLLU << 32) / sc->st[DEFAULT_TIMER].et.et_frequency;
251 sc->st[DEFAULT_TIMER].et.et_start = bcm_systimer_start;
252 sc->st[DEFAULT_TIMER].et.et_stop = bcm_systimer_stop;
253 sc->st[DEFAULT_TIMER].et.et_priv = &sc->st[DEFAULT_TIMER];
254 et_register(&sc->st[DEFAULT_TIMER].et);
255
256 bcm_systimer_sc = sc;
257
258 bcm_systimer_tc.tc_frequency = DEFAULT_FREQUENCY;
259 tc_init(&bcm_systimer_tc);
260
261 return (0);
262}
263
264static device_method_t bcm_systimer_methods[] = {
265 DEVMETHOD(device_probe, bcm_systimer_probe),
266 DEVMETHOD(device_attach, bcm_systimer_attach),
267 { 0, 0 }
268};
269
270static driver_t bcm_systimer_driver = {
271 "systimer",
272 bcm_systimer_methods,
273 sizeof(struct bcm_systimer_softc),
274};
275
276static devclass_t bcm_systimer_devclass;
277
278DRIVER_MODULE(bcm_systimer, simplebus, bcm_systimer_driver, bcm_systimer_devclass, 0, 0);
279
280void
| 30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/bus.h>
34#include <sys/kernel.h>
35#include <sys/module.h>
36#include <sys/malloc.h>
37#include <sys/rman.h>
38#include <sys/timeet.h>
39#include <sys/timetc.h>
40#include <sys/watchdog.h>
41#include <machine/bus.h>
42#include <machine/cpu.h>
43#include <machine/intr.h>
44
45#include <dev/fdt/fdt_common.h>
46#include <dev/ofw/openfirm.h>
47#include <dev/ofw/ofw_bus.h>
48#include <dev/ofw/ofw_bus_subr.h>
49
50#include <machine/bus.h>
51#include <machine/fdt.h>
52
53#define BCM2835_NUM_TIMERS 4
54
55#define DEFAULT_TIMER 3
56#define DEFAULT_FREQUENCY 1000000
57#define MIN_PERIOD 5LLU
58
59#define SYSTIMER_CS 0x00
60#define SYSTIMER_CLO 0x04
61#define SYSTIMER_CHI 0x08
62#define SYSTIMER_C0 0x0C
63#define SYSTIMER_C1 0x10
64#define SYSTIMER_C2 0x14
65#define SYSTIMER_C3 0x18
66
67struct systimer {
68 int index;
69 bool enabled;
70 struct eventtimer et;
71};
72
73struct bcm_systimer_softc {
74 struct resource* mem_res;
75 struct resource* irq_res[BCM2835_NUM_TIMERS];
76 void* intr_hl[BCM2835_NUM_TIMERS];
77 uint32_t sysclk_freq;
78 bus_space_tag_t bst;
79 bus_space_handle_t bsh;
80 struct systimer st[BCM2835_NUM_TIMERS];
81};
82
83static struct resource_spec bcm_systimer_irq_spec[] = {
84 { SYS_RES_IRQ, 0, RF_ACTIVE },
85 { SYS_RES_IRQ, 1, RF_ACTIVE },
86 { SYS_RES_IRQ, 2, RF_ACTIVE },
87 { SYS_RES_IRQ, 3, RF_ACTIVE },
88 { -1, 0, 0 }
89};
90
91static struct bcm_systimer_softc *bcm_systimer_sc = NULL;
92
93/* Read/Write macros for Timer used as timecounter */
94#define bcm_systimer_tc_read_4(reg) \
95 bus_space_read_4(bcm_systimer_sc->bst, \
96 bcm_systimer_sc->bsh, reg)
97
98#define bcm_systimer_tc_write_4(reg, val) \
99 bus_space_write_4(bcm_systimer_sc->bst, \
100 bcm_systimer_sc->bsh, reg, val)
101
102static unsigned bcm_systimer_tc_get_timecount(struct timecounter *);
103
104static struct timecounter bcm_systimer_tc = {
105 .tc_name = "BCM2835 Timecounter",
106 .tc_get_timecount = bcm_systimer_tc_get_timecount,
107 .tc_poll_pps = NULL,
108 .tc_counter_mask = ~0u,
109 .tc_frequency = 0,
110 .tc_quality = 1000,
111};
112
113static unsigned
114bcm_systimer_tc_get_timecount(struct timecounter *tc)
115{
116 return bcm_systimer_tc_read_4(SYSTIMER_CLO);
117}
118
119static int
120bcm_systimer_start(struct eventtimer *et, sbintime_t first, sbintime_t period)
121{
122 struct systimer *st = et->et_priv;
123 uint32_t clo, clo1;
124 uint32_t count;
125 register_t s;
126
127 if (first != 0) {
128
129 count = ((uint32_t)et->et_frequency * first) >> 32;
130
131 s = intr_disable();
132 clo = bcm_systimer_tc_read_4(SYSTIMER_CLO);
133restart:
134 clo += count;
135 /*
136 * Clear pending interrupts
137 */
138 bcm_systimer_tc_write_4(SYSTIMER_CS, (1 << st->index));
139 bcm_systimer_tc_write_4(SYSTIMER_C0 + st->index*4, clo);
140 clo1 = bcm_systimer_tc_read_4(SYSTIMER_CLO);
141 if ((int32_t)(clo1 - clo) >= 0) {
142 count *= 2;
143 clo = clo1;
144 goto restart;
145 }
146 st->enabled = 1;
147 intr_restore(s);
148
149 return (0);
150 }
151
152 return (EINVAL);
153}
154
155static int
156bcm_systimer_stop(struct eventtimer *et)
157{
158 struct systimer *st = et->et_priv;
159 st->enabled = 0;
160
161 return (0);
162}
163
164static int
165bcm_systimer_intr(void *arg)
166{
167 struct systimer *st = (struct systimer *)arg;
168 uint32_t cs;
169
170 cs = bcm_systimer_tc_read_4(SYSTIMER_CS);
171 if ((cs & (1 << st->index)) == 0)
172 return (FILTER_STRAY);
173
174 /* ACK interrupt */
175 bcm_systimer_tc_write_4(SYSTIMER_CS, (1 << st->index));
176 if (st->enabled) {
177 if (st->et.et_active) {
178 st->et.et_event_cb(&st->et, st->et.et_arg);
179 }
180 }
181
182 return (FILTER_HANDLED);
183}
184
185static int
186bcm_systimer_probe(device_t dev)
187{
188
189 if (!ofw_bus_status_okay(dev))
190 return (ENXIO);
191
192 if (ofw_bus_is_compatible(dev, "broadcom,bcm2835-system-timer")) {
193 device_set_desc(dev, "BCM2835 System Timer");
194 return (BUS_PROBE_DEFAULT);
195 }
196
197 return (ENXIO);
198}
199
200static int
201bcm_systimer_attach(device_t dev)
202{
203 struct bcm_systimer_softc *sc = device_get_softc(dev);
204 int err;
205 int rid = 0;
206
207 if (bcm_systimer_sc != NULL)
208 return (EINVAL);
209
210 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
211 if (sc->mem_res == NULL) {
212 device_printf(dev, "could not allocate memory resource\n");
213 return (ENXIO);
214 }
215
216 sc->bst = rman_get_bustag(sc->mem_res);
217 sc->bsh = rman_get_bushandle(sc->mem_res);
218
219 /* Request the IRQ resources */
220 err = bus_alloc_resources(dev, bcm_systimer_irq_spec,
221 sc->irq_res);
222 if (err) {
223 device_printf(dev, "Error: could not allocate irq resources\n");
224 return (ENXIO);
225 }
226
227 /* TODO: get frequency from FDT */
228 sc->sysclk_freq = DEFAULT_FREQUENCY;
229
230 /* Setup and enable the timer */
231 if (bus_setup_intr(dev, sc->irq_res[DEFAULT_TIMER], INTR_TYPE_CLK,
232 bcm_systimer_intr, NULL, &sc->st[DEFAULT_TIMER],
233 &sc->intr_hl[DEFAULT_TIMER]) != 0) {
234 bus_release_resources(dev, bcm_systimer_irq_spec,
235 sc->irq_res);
236 device_printf(dev, "Unable to setup the clock irq handler.\n");
237 return (ENXIO);
238 }
239
240 sc->st[DEFAULT_TIMER].index = DEFAULT_TIMER;
241 sc->st[DEFAULT_TIMER].enabled = 0;
242 sc->st[DEFAULT_TIMER].et.et_name = malloc(64, M_DEVBUF, M_NOWAIT | M_ZERO);
243 sprintf(sc->st[DEFAULT_TIMER].et.et_name, "BCM2835 Event Timer %d", DEFAULT_TIMER);
244 sc->st[DEFAULT_TIMER].et.et_flags = ET_FLAGS_ONESHOT;
245 sc->st[DEFAULT_TIMER].et.et_quality = 1000;
246 sc->st[DEFAULT_TIMER].et.et_frequency = sc->sysclk_freq;
247 sc->st[DEFAULT_TIMER].et.et_min_period =
248 (MIN_PERIOD << 32) / sc->st[DEFAULT_TIMER].et.et_frequency + 1;
249 sc->st[DEFAULT_TIMER].et.et_max_period =
250 (0x7ffffffeLLU << 32) / sc->st[DEFAULT_TIMER].et.et_frequency;
251 sc->st[DEFAULT_TIMER].et.et_start = bcm_systimer_start;
252 sc->st[DEFAULT_TIMER].et.et_stop = bcm_systimer_stop;
253 sc->st[DEFAULT_TIMER].et.et_priv = &sc->st[DEFAULT_TIMER];
254 et_register(&sc->st[DEFAULT_TIMER].et);
255
256 bcm_systimer_sc = sc;
257
258 bcm_systimer_tc.tc_frequency = DEFAULT_FREQUENCY;
259 tc_init(&bcm_systimer_tc);
260
261 return (0);
262}
263
264static device_method_t bcm_systimer_methods[] = {
265 DEVMETHOD(device_probe, bcm_systimer_probe),
266 DEVMETHOD(device_attach, bcm_systimer_attach),
267 { 0, 0 }
268};
269
270static driver_t bcm_systimer_driver = {
271 "systimer",
272 bcm_systimer_methods,
273 sizeof(struct bcm_systimer_softc),
274};
275
276static devclass_t bcm_systimer_devclass;
277
278DRIVER_MODULE(bcm_systimer, simplebus, bcm_systimer_driver, bcm_systimer_devclass, 0, 0);
279
280void
|