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>
29 __FBSDID("$FreeBSD: releng/10.0/sys/arm/versatile/sp804.c 247463 2013-02-28 13:46:03Z mav $");
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/frame.h>
44 #include <machine/intr.h>
45
46 #include <dev/fdt/fdt_common.h>
47 #include <dev/ofw/openfirm.h>
48 #include <dev/ofw/ofw_bus.h>
49 #include <dev/ofw/ofw_bus_subr.h>
50
51 #include <machine/bus.h>
52 #include <machine/fdt.h>
53
54 #define SP804_TIMER1_LOAD 0x00
55 #define SP804_TIMER1_VALUE 0x04
56 #define SP804_TIMER1_CONTROL 0x08
57 #define TIMER_CONTROL_EN (1 << 7)
58 #define TIMER_CONTROL_FREERUN (0 << 6)
59 #define TIMER_CONTROL_PERIODIC (1 << 6)
60 #define TIMER_CONTROL_INTREN (1 << 5)
61 #define TIMER_CONTROL_DIV1 (0 << 2)
62 #define TIMER_CONTROL_DIV16 (1 << 2)
63 #define TIMER_CONTROL_DIV256 (2 << 2)
64 #define TIMER_CONTROL_32BIT (1 << 1)
65 #define TIMER_CONTROL_ONESHOT (1 << 0)
66 #define SP804_TIMER1_INTCLR 0x0C
67 #define SP804_TIMER1_RIS 0x10
68 #define SP804_TIMER1_MIS 0x14
69 #define SP804_TIMER1_BGLOAD 0x18
70 #define SP804_TIMER2_LOAD 0x20
71 #define SP804_TIMER2_VALUE 0x24
72 #define SP804_TIMER2_CONTROL 0x28
73 #define SP804_TIMER2_INTCLR 0x2C
74 #define SP804_TIMER2_RIS 0x30
75 #define SP804_TIMER2_MIS 0x34
76 #define SP804_TIMER2_BGLOAD 0x38
77
78 #define SP804_PERIPH_ID0 0xFE0
79 #define SP804_PERIPH_ID1 0xFE4
80 #define SP804_PERIPH_ID2 0xFE8
81 #define SP804_PERIPH_ID3 0xFEC
82 #define SP804_PRIMECELL_ID0 0xFF0
83 #define SP804_PRIMECELL_ID1 0xFF4
84 #define SP804_PRIMECELL_ID2 0xFF8
85 #define SP804_PRIMECELL_ID3 0xFFC
86
87 #define DEFAULT_FREQUENCY 1000000
88 /*
89 * QEMU seems to have problem with full frequency
90 */
91 #define DEFAULT_DIVISOR 16
92 #define DEFAULT_CONTROL_DIV TIMER_CONTROL_DIV16
93
94 struct sp804_timer_softc {
95 struct resource* mem_res;
96 struct resource* irq_res;
97 void* intr_hl;
98 uint32_t sysclk_freq;
99 bus_space_tag_t bst;
100 bus_space_handle_t bsh;
101 struct timecounter tc;
102 bool et_enabled;
103 struct eventtimer et;
104 };
105
106 /* Read/Write macros for Timer used as timecounter */
107 #define sp804_timer_tc_read_4(reg) \
108 bus_space_read_4(sc->bst, sc->bsh, reg)
109
110 #define sp804_timer_tc_write_4(reg, val) \
111 bus_space_write_4(sc->bst, sc->bsh, reg, val)
112
113 static unsigned sp804_timer_tc_get_timecount(struct timecounter *);
114
115 static unsigned
116 sp804_timer_tc_get_timecount(struct timecounter *tc)
117 {
118 struct sp804_timer_softc *sc = tc->tc_priv;
119 return 0xffffffff - sp804_timer_tc_read_4(SP804_TIMER1_VALUE);
120 }
121
122 static int
123 sp804_timer_start(struct eventtimer *et, sbintime_t first, sbintime_t period)
124 {
125 struct sp804_timer_softc *sc = et->et_priv;
126 uint32_t count, reg;
127
128 if (first != 0) {
129 sc->et_enabled = 1;
130
131 count = ((uint32_t)et->et_frequency * first) >> 32;
132
133 sp804_timer_tc_write_4(SP804_TIMER2_LOAD, count);
134 reg = TIMER_CONTROL_32BIT | TIMER_CONTROL_INTREN |
135 TIMER_CONTROL_PERIODIC | DEFAULT_CONTROL_DIV |
136 TIMER_CONTROL_EN;
137 sp804_timer_tc_write_4(SP804_TIMER2_CONTROL, reg);
138
139 return (0);
140 }
141
142 if (period != 0) {
143 panic("period");
144 }
145
146 return (EINVAL);
147 }
148
149 static int
150 sp804_timer_stop(struct eventtimer *et)
151 {
152 struct sp804_timer_softc *sc = et->et_priv;
153 uint32_t reg;
154
155 sc->et_enabled = 0;
156 reg = sp804_timer_tc_read_4(SP804_TIMER2_CONTROL);
157 reg &= ~(TIMER_CONTROL_EN);
158 sp804_timer_tc_write_4(SP804_TIMER2_CONTROL, reg);
159
160 return (0);
161 }
162
163 static int
164 sp804_timer_intr(void *arg)
165 {
166 struct sp804_timer_softc *sc = arg;
167 static uint32_t prev = 0;
168 uint32_t x = 0;
169
170 x = sp804_timer_tc_read_4(SP804_TIMER1_VALUE);
171
172 prev =x ;
173 sp804_timer_tc_write_4(SP804_TIMER2_INTCLR, 1);
174 if (sc->et_enabled) {
175 if (sc->et.et_active) {
176 sc->et.et_event_cb(&sc->et, sc->et.et_arg);
177 }
178 }
179
180 return (FILTER_HANDLED);
181 }
182
183 static int
184 sp804_timer_probe(device_t dev)
185 {
186
187 if (ofw_bus_is_compatible(dev, "arm,sp804")) {
188 device_set_desc(dev, "SP804 System Timer");
189 return (BUS_PROBE_DEFAULT);
190 }
191
192 return (ENXIO);
193 }
194
195 static int
196 sp804_timer_attach(device_t dev)
197 {
198 struct sp804_timer_softc *sc = device_get_softc(dev);
199 int rid = 0;
200 int i;
201 uint32_t id, reg;
202
203 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
204 if (sc->mem_res == NULL) {
205 device_printf(dev, "could not allocate memory resource\n");
206 return (ENXIO);
207 }
208
209 sc->bst = rman_get_bustag(sc->mem_res);
210 sc->bsh = rman_get_bushandle(sc->mem_res);
211
212 /* Request the IRQ resources */
213 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
214 if (sc->irq_res == NULL) {
215 device_printf(dev, "Error: could not allocate irq resources\n");
216 return (ENXIO);
217 }
218
219 /* TODO: get frequency from FDT */
220 sc->sysclk_freq = DEFAULT_FREQUENCY;
221
222 /* Setup and enable the timer */
223 if (bus_setup_intr(dev, sc->irq_res, INTR_TYPE_CLK,
224 sp804_timer_intr, NULL, sc,
225 &sc->intr_hl) != 0) {
226 bus_release_resource(dev, SYS_RES_IRQ, rid,
227 sc->irq_res);
228 device_printf(dev, "Unable to setup the clock irq handler.\n");
229 return (ENXIO);
230 }
231
232 sp804_timer_tc_write_4(SP804_TIMER1_CONTROL, 0);
233 sp804_timer_tc_write_4(SP804_TIMER2_CONTROL, 0);
234
235 /*
236 * Timer 1, timecounter
237 */
238 sc->tc.tc_frequency = DEFAULT_FREQUENCY;
239 sc->tc.tc_name = "SP804 Timecouter";
240 sc->tc.tc_get_timecount = sp804_timer_tc_get_timecount;
241 sc->tc.tc_poll_pps = NULL;
242 sc->tc.tc_counter_mask = ~0u;
243 sc->tc.tc_quality = 1000;
244 sc->tc.tc_priv = sc;
245
246 sp804_timer_tc_write_4(SP804_TIMER1_VALUE, 0xffffffff);
247 sp804_timer_tc_write_4(SP804_TIMER1_LOAD, 0xffffffff);
248 reg = TIMER_CONTROL_PERIODIC | TIMER_CONTROL_32BIT;
249 sp804_timer_tc_write_4(SP804_TIMER1_CONTROL, reg);
250 reg |= TIMER_CONTROL_EN;
251 sp804_timer_tc_write_4(SP804_TIMER1_CONTROL, reg);
252 tc_init(&sc->tc);
253
254 /*
255 * Timer 2, event timer
256 */
257 sc->et_enabled = 0;
258 sc->et.et_name = malloc(64, M_DEVBUF, M_NOWAIT | M_ZERO);
259 sprintf(sc->et.et_name, "SP804 Event Timer %d",
260 device_get_unit(dev));
261 sc->et.et_flags = ET_FLAGS_PERIODIC | ET_FLAGS_ONESHOT;
262 sc->et.et_quality = 1000;
263 sc->et.et_frequency = sc->sysclk_freq / DEFAULT_DIVISOR;
264 sc->et.et_min_period = (0x00000002LLU << 32) / sc->et.et_frequency;
265 sc->et.et_max_period = (0xfffffffeLLU << 32) / sc->et.et_frequency;
266 sc->et.et_start = sp804_timer_start;
267 sc->et.et_stop = sp804_timer_stop;
268 sc->et.et_priv = sc;
269 et_register(&sc->et);
270
271 id = 0;
272 for (i = 3; i >= 0; i--) {
273 id = (id << 8) |
274 (sp804_timer_tc_read_4(SP804_PERIPH_ID0 + i*4) & 0xff);
275 }
276
277 device_printf(dev, "peripheral ID: %08x\n", id);
278
279 id = 0;
280 for (i = 3; i >= 0; i--) {
281 id = (id << 8) |
282 (sp804_timer_tc_read_4(SP804_PRIMECELL_ID0 + i*4) & 0xff);
283 }
284
285 device_printf(dev, "PrimeCell ID: %08x\n", id);
286
287 return (0);
288 }
289
290 static device_method_t sp804_timer_methods[] = {
291 DEVMETHOD(device_probe, sp804_timer_probe),
292 DEVMETHOD(device_attach, sp804_timer_attach),
293 { 0, 0 }
294 };
295
296 static driver_t sp804_timer_driver = {
297 "timer",
298 sp804_timer_methods,
299 sizeof(struct sp804_timer_softc),
300 };
301
302 static devclass_t sp804_timer_devclass;
303
304 DRIVER_MODULE(sp804_timer, simplebus, sp804_timer_driver, sp804_timer_devclass, 0, 0);
305
306 void
307 DELAY(int usec)
308 {
309 int32_t counts;
310 uint32_t first, last;
311 device_t timer_dev;
312 struct sp804_timer_softc *sc;
313
314 timer_dev = devclass_get_device(sp804_timer_devclass, 0);
315
316 if (timer_dev == NULL) {
317 /*
318 * Timer is not initialized yet
319 */
320 for (; usec > 0; usec--)
321 for (counts = 200; counts > 0; counts--)
322 /* Prevent gcc from optimizing out the loop */
323 cpufunc_nullop();
324 return;
325 }
326
327 sc = device_get_softc(timer_dev);
328
329 /* Get the number of times to count */
330 counts = usec * ((sc->tc.tc_frequency / 1000000) + 1);
331
332 first = sp804_timer_tc_get_timecount(&sc->tc);
333
334 while (counts > 0) {
335 last = sp804_timer_tc_get_timecount(&sc->tc);
336 if (last == first)
337 continue;
338 if (last>first) {
339 counts -= (int32_t)(last - first);
340 } else {
341 counts -= (int32_t)((0xFFFFFFFF - first) + last);
342 }
343 first = last;
344 }
345 }
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