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at91_pit.c (237130) at91_pit.c (238370)
1/*-
2 * Copyright (c) 2009 Gallon Sylvestre. All rights reserved.
3 * Copyright (c) 2010 Greg Ansley. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
1/*-
2 * Copyright (c) 2009 Gallon Sylvestre. All rights reserved.
3 * Copyright (c) 2010 Greg Ansley. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

--- 11 unchanged lines hidden (view full) ---

20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/arm/at91/at91_pit.c 237130 2012-06-15 08:37:50Z imp $");
28__FBSDID("$FreeBSD: head/sys/arm/at91/at91_pit.c 238370 2012-07-11 17:11:54Z imp $");
29
30#include <sys/param.h>
31#include <sys/bus.h>
32#include <sys/kernel.h>
33#include <sys/module.h>
34#include <sys/resource.h>
35#include <sys/systm.h>
36#include <sys/rman.h>

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54
55static struct pit_softc {
56 struct resource *mem_res; /* Memory resource */
57 void *intrhand; /* Interrupt handle */
58 device_t sc_dev;
59} *sc;
60
61static uint32_t timecount = 0;
29
30#include <sys/param.h>
31#include <sys/bus.h>
32#include <sys/kernel.h>
33#include <sys/module.h>
34#include <sys/resource.h>
35#include <sys/systm.h>
36#include <sys/rman.h>

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54
55static struct pit_softc {
56 struct resource *mem_res; /* Memory resource */
57 void *intrhand; /* Interrupt handle */
58 device_t sc_dev;
59} *sc;
60
61static uint32_t timecount = 0;
62static unsigned at91pit_get_timecount(struct timecounter *tc);
62static unsigned at91_pit_get_timecount(struct timecounter *tc);
63static int pit_intr(void *arg);
64
65static inline uint32_t
66RD4(struct pit_softc *sc, bus_size_t off)
67{
68
69 return (bus_read_4(sc->mem_res, off));
70}
71
72static inline void
73WR4(struct pit_softc *sc, bus_size_t off, uint32_t val)
74{
75
76 bus_write_4(sc->mem_res, off, val);
77}
78
63static int pit_intr(void *arg);
64
65static inline uint32_t
66RD4(struct pit_softc *sc, bus_size_t off)
67{
68
69 return (bus_read_4(sc->mem_res, off));
70}
71
72static inline void
73WR4(struct pit_softc *sc, bus_size_t off, uint32_t val)
74{
75
76 bus_write_4(sc->mem_res, off, val);
77}
78
79static void
80at91pit_delay(int us)
79void
80at91_pit_delay(int us)
81{
82 int32_t cnt, last, piv;
83 uint64_t pit_freq;
84 const uint64_t mhz = 1E6;
85
86 last = PIT_PIV(RD4(sc, PIT_PIIR));
87
88 /* Max delay ~= 260s. @ 133Mhz */

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94 piv = PIT_PIV(RD4(sc, PIT_PIIR));
95 cnt -= piv - last ;
96 if (piv < last)
97 cnt -= PIT_PIV(~0u) - last;
98 last = piv;
99 }
100}
101
81{
82 int32_t cnt, last, piv;
83 uint64_t pit_freq;
84 const uint64_t mhz = 1E6;
85
86 last = PIT_PIV(RD4(sc, PIT_PIIR));
87
88 /* Max delay ~= 260s. @ 133Mhz */

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94 piv = PIT_PIV(RD4(sc, PIT_PIIR));
95 cnt -= piv - last ;
96 if (piv < last)
97 cnt -= PIT_PIV(~0u) - last;
98 last = piv;
99 }
100}
101
102static struct timecounter at91pit_timecounter = {
103 at91pit_get_timecount, /* get_timecount */
102static struct timecounter at91_pit_timecounter = {
103 at91_pit_get_timecount, /* get_timecount */
104 NULL, /* no poll_pps */
105 0xffffffff, /* counter mask */
106 0 / PIT_PRESCALE, /* frequency */
107 "AT91SAM9 timer", /* name */
108 1000 /* quality */
109};
110
111static int
104 NULL, /* no poll_pps */
105 0xffffffff, /* counter mask */
106 0 / PIT_PRESCALE, /* frequency */
107 "AT91SAM9 timer", /* name */
108 1000 /* quality */
109};
110
111static int
112at91pit_probe(device_t dev)
112at91_pit_probe(device_t dev)
113{
114
115 device_set_desc(dev, "AT91SAM9 PIT");
116 return (0);
117}
118
119static int
113{
114
115 device_set_desc(dev, "AT91SAM9 PIT");
116 return (0);
117}
118
119static int
120at91pit_attach(device_t dev)
120at91_pit_attach(device_t dev)
121{
122 void *ih;
123 int rid, err = 0;
124 struct at91_softc *at91_sc;
125 struct resource *irq;
126
127 at91_sc = device_get_softc(device_get_parent(dev));
128 sc = device_get_softc(dev);

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143 err = ENOMEM;
144 goto out;
145 }
146
147 /* Activate the interrupt. */
148 err = bus_setup_intr(dev, irq, INTR_TYPE_CLK, pit_intr, NULL, NULL,
149 &ih);
150
121{
122 void *ih;
123 int rid, err = 0;
124 struct at91_softc *at91_sc;
125 struct resource *irq;
126
127 at91_sc = device_get_softc(device_get_parent(dev));
128 sc = device_get_softc(dev);

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143 err = ENOMEM;
144 goto out;
145 }
146
147 /* Activate the interrupt. */
148 err = bus_setup_intr(dev, irq, INTR_TYPE_CLK, pit_intr, NULL, NULL,
149 &ih);
150
151 at91pit_timecounter.tc_frequency = at91_master_clock / PIT_PRESCALE;
152 tc_init(&at91pit_timecounter);
151 at91_pit_timecounter.tc_frequency = at91_master_clock / PIT_PRESCALE;
152 tc_init(&at91_pit_timecounter);
153
154 /* Enable the PIT here. */
155 WR4(sc, PIT_MR, PIT_PIV(at91_master_clock / PIT_PRESCALE / hz) |
156 PIT_EN | PIT_IEN);
153
154 /* Enable the PIT here. */
155 WR4(sc, PIT_MR, PIT_PIV(at91_master_clock / PIT_PRESCALE / hz) |
156 PIT_EN | PIT_IEN);
157 soc_data.delay = at91pit_delay;
158out:
159 return (err);
160}
161
157out:
158 return (err);
159}
160
162static device_method_t at91pit_methods[] = {
163 DEVMETHOD(device_probe, at91pit_probe),
164 DEVMETHOD(device_attach, at91pit_attach),
161static device_method_t at91_pit_methods[] = {
162 DEVMETHOD(device_probe, at91_pit_probe),
163 DEVMETHOD(device_attach, at91_pit_attach),
165 DEVMETHOD_END
166};
167
164 DEVMETHOD_END
165};
166
168static driver_t at91pit_driver = {
167static driver_t at91_pit_driver = {
169 "at91_pit",
168 "at91_pit",
170 at91pit_methods,
169 at91_pit_methods,
171 sizeof(struct pit_softc),
172};
173
170 sizeof(struct pit_softc),
171};
172
174static devclass_t at91pit_devclass;
173static devclass_t at91_pit_devclass;
175
174
176DRIVER_MODULE(at91_pit, atmelarm, at91pit_driver, at91pit_devclass, NULL,
175DRIVER_MODULE(at91_pit, atmelarm, at91_pit_driver, at91_pit_devclass, NULL,
177 NULL);
178
179static int
180pit_intr(void *arg)
181{
182 struct trapframe *fp = arg;
183 uint32_t icnt;
184

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190
191 hardclock(TRAPF_USERMODE(fp), TRAPF_PC(fp));
192 return (FILTER_HANDLED);
193 }
194 return (FILTER_STRAY);
195}
196
197static unsigned
176 NULL);
177
178static int
179pit_intr(void *arg)
180{
181 struct trapframe *fp = arg;
182 uint32_t icnt;
183

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189
190 hardclock(TRAPF_USERMODE(fp), TRAPF_PC(fp));
191 return (FILTER_HANDLED);
192 }
193 return (FILTER_STRAY);
194}
195
196static unsigned
198at91pit_get_timecount(struct timecounter *tc)
197at91_pit_get_timecount(struct timecounter *tc)
199{
200 uint32_t piir, icnt;
201
202 piir = RD4(sc, PIT_PIIR); /* Current count | over flows */
203 icnt = piir >> 20; /* Overflows */
204 return (timecount + PIT_PIV(piir) + PIT_PIV(RD4(sc, PIT_MR)) * icnt);
205}
198{
199 uint32_t piir, icnt;
200
201 piir = RD4(sc, PIT_PIIR); /* Current count | over flows */
202 icnt = piir >> 20; /* Overflows */
203 return (timecount + PIT_PIV(piir) + PIT_PIV(RD4(sc, PIT_MR)) * icnt);
204}