FreeBSD/Linux Kernel Cross Reference
sys/arm/lpc/lpc_dmac.c
1 /*-
2 * Copyright (c) 2011 Jakub Wojciech Klama <jceel@FreeBSD.org>
3 * 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
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD: releng/10.0/sys/arm/lpc/lpc_dmac.c 239278 2012-08-15 05:37:10Z gonzo $");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/bio.h>
34 #include <sys/bus.h>
35 #include <sys/conf.h>
36 #include <sys/endian.h>
37 #include <sys/kernel.h>
38 #include <sys/kthread.h>
39 #include <sys/lock.h>
40 #include <sys/malloc.h>
41 #include <sys/module.h>
42 #include <sys/mutex.h>
43 #include <sys/queue.h>
44 #include <sys/resource.h>
45 #include <sys/rman.h>
46 #include <sys/time.h>
47 #include <sys/timetc.h>
48 #include <sys/watchdog.h>
49
50 #include <sys/kdb.h>
51
52 #include <dev/ofw/ofw_bus.h>
53 #include <dev/ofw/ofw_bus_subr.h>
54
55 #include <arm/lpc/lpcreg.h>
56 #include <arm/lpc/lpcvar.h>
57
58 struct lpc_dmac_channel
59 {
60 struct lpc_dmac_channel_config *ldc_config;
61 int ldc_flags;
62 };
63
64 struct lpc_dmac_softc
65 {
66 device_t ld_dev;
67 struct mtx ld_mtx;
68 struct resource * ld_mem_res;
69 struct resource * ld_irq_res;
70 bus_space_tag_t ld_bst;
71 bus_space_handle_t ld_bsh;
72 void * ld_intrhand;
73 struct lpc_dmac_channel ld_channels[8];
74 };
75
76 static struct lpc_dmac_softc *lpc_dmac_sc = NULL;
77
78 static int lpc_dmac_probe(device_t);
79 static int lpc_dmac_attach(device_t);
80 static void lpc_dmac_intr(void *);
81
82 #define lpc_dmac_read_4(_sc, _reg) \
83 bus_space_read_4(_sc->ld_bst, _sc->ld_bsh, _reg)
84 #define lpc_dmac_write_4(_sc, _reg, _value) \
85 bus_space_write_4(_sc->ld_bst, _sc->ld_bsh, _reg, _value)
86 #define lpc_dmac_read_ch_4(_sc, _n, _reg) \
87 bus_space_read_4(_sc->ld_bst, _sc->ld_bsh, (_reg + LPC_DMAC_CHADDR(_n)))
88 #define lpc_dmac_write_ch_4(_sc, _n, _reg, _value) \
89 bus_space_write_4(_sc->ld_bst, _sc->ld_bsh, (_reg + LPC_DMAC_CHADDR(_n)), _value)
90
91 static int lpc_dmac_probe(device_t dev)
92 {
93 if (!ofw_bus_is_compatible(dev, "lpc,dmac"))
94 return (ENXIO);
95
96 device_set_desc(dev, "LPC32x0 General Purpose DMA controller");
97 return (BUS_PROBE_DEFAULT);
98 }
99
100 static int lpc_dmac_attach(device_t dev)
101 {
102 struct lpc_dmac_softc *sc = device_get_softc(dev);
103 int rid;
104
105 rid = 0;
106 sc->ld_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
107 RF_ACTIVE);
108 if (!sc->ld_mem_res) {
109 device_printf(dev, "cannot allocate memory window\n");
110 return (ENXIO);
111 }
112
113 sc->ld_bst = rman_get_bustag(sc->ld_mem_res);
114 sc->ld_bsh = rman_get_bushandle(sc->ld_mem_res);
115
116 rid = 0;
117 sc->ld_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
118 RF_ACTIVE);
119 if (!sc->ld_irq_res) {
120 device_printf(dev, "cannot allocate cmd interrupt\n");
121 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->ld_mem_res);
122 return (ENXIO);
123 }
124
125 if (bus_setup_intr(dev, sc->ld_irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
126 NULL, lpc_dmac_intr, sc, &sc->ld_intrhand))
127 {
128 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->ld_mem_res);
129 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->ld_irq_res);
130 device_printf(dev, "cannot setup interrupt handler\n");
131 return (ENXIO);
132 }
133
134 lpc_dmac_sc = sc;
135
136 lpc_pwr_write(dev, LPC_CLKPWR_DMACLK_CTRL, LPC_CLKPWR_DMACLK_CTRL_EN);
137 lpc_dmac_write_4(sc, LPC_DMAC_CONFIG, LPC_DMAC_CONFIG_ENABLE);
138
139 lpc_dmac_write_4(sc, LPC_DMAC_INTTCCLEAR, 0xff);
140 lpc_dmac_write_4(sc, LPC_DMAC_INTERRCLEAR, 0xff);
141
142 return (0);
143 }
144
145 static void lpc_dmac_intr(void *arg)
146 {
147 struct lpc_dmac_softc *sc = (struct lpc_dmac_softc *)arg;
148 struct lpc_dmac_channel *ch;
149 uint32_t intstat, tcstat, errstat;
150 int i;
151
152 do {
153 intstat = lpc_dmac_read_4(sc, LPC_DMAC_INTSTAT);
154
155 for (i = 0; i < LPC_DMAC_CHNUM; i++) {
156 if ((intstat & (1 << i)) == 0)
157 continue;
158
159 ch = &sc->ld_channels[i];
160 tcstat = lpc_dmac_read_4(sc, LPC_DMAC_INTTCSTAT);
161 errstat = lpc_dmac_read_4(sc, LPC_DMAC_INTERRSTAT);
162
163 if (tcstat & (1 << i)) {
164 ch->ldc_config->ldc_success_handler(
165 ch->ldc_config->ldc_handler_arg);
166 lpc_dmac_write_4(sc, LPC_DMAC_INTTCCLEAR, (1 << i));
167 }
168
169 if (errstat & (1 << i)) {
170 ch->ldc_config->ldc_error_handler(
171 ch->ldc_config->ldc_handler_arg);
172 lpc_dmac_write_4(sc, LPC_DMAC_INTERRCLEAR, (1 << i));
173 }
174 }
175
176 } while (intstat);
177 }
178
179 int
180 lpc_dmac_config_channel(device_t dev, int chno, struct lpc_dmac_channel_config *cfg)
181 {
182 struct lpc_dmac_softc *sc = lpc_dmac_sc;
183 struct lpc_dmac_channel *ch;
184
185 if (sc == NULL)
186 return (ENXIO);
187
188 ch = &sc->ld_channels[chno];
189 ch->ldc_config = cfg;
190
191 return 0;
192 }
193
194 int
195 lpc_dmac_setup_transfer(device_t dev, int chno, bus_addr_t src, bus_addr_t dst,
196 bus_size_t size, int flags)
197 {
198 struct lpc_dmac_softc *sc = lpc_dmac_sc;
199 struct lpc_dmac_channel *ch;
200 uint32_t ctrl, cfg;
201
202 if (sc == NULL)
203 return (ENXIO);
204
205 ch = &sc->ld_channels[chno];
206
207 ctrl = LPC_DMAC_CH_CONTROL_I |
208 (ch->ldc_config->ldc_dst_incr ? LPC_DMAC_CH_CONTROL_DI : 0) |
209 (ch->ldc_config->ldc_src_incr ? LPC_DMAC_CH_CONTROL_SI : 0) |
210 LPC_DMAC_CH_CONTROL_DWIDTH(ch->ldc_config->ldc_dst_width) |
211 LPC_DMAC_CH_CONTROL_SWIDTH(ch->ldc_config->ldc_src_width) |
212 LPC_DMAC_CH_CONTROL_DBSIZE(ch->ldc_config->ldc_dst_burst) |
213 LPC_DMAC_CH_CONTROL_SBSIZE(ch->ldc_config->ldc_src_burst) |
214 size;
215
216 cfg = LPC_DMAC_CH_CONFIG_ITC | LPC_DMAC_CH_CONFIG_IE |
217 LPC_DMAC_CH_CONFIG_FLOWCNTL(ch->ldc_config->ldc_fcntl) |
218 LPC_DMAC_CH_CONFIG_DESTP(ch->ldc_config->ldc_dst_periph) |
219 LPC_DMAC_CH_CONFIG_SRCP(ch->ldc_config->ldc_src_periph) | LPC_DMAC_CH_CONFIG_E;
220 lpc_dmac_write_ch_4(sc, chno, LPC_DMAC_CH_SRCADDR, src);
221 lpc_dmac_write_ch_4(sc, chno, LPC_DMAC_CH_DSTADDR, dst);
222 lpc_dmac_write_ch_4(sc, chno, LPC_DMAC_CH_LLI, 0);
223 lpc_dmac_write_ch_4(sc, chno, LPC_DMAC_CH_CONTROL, ctrl);
224 lpc_dmac_write_ch_4(sc, chno, LPC_DMAC_CH_CONFIG, cfg);
225
226 return 0;
227 }
228
229 int
230 lpc_dmac_enable_channel(device_t dev, int chno)
231 {
232 struct lpc_dmac_softc *sc = lpc_dmac_sc;
233 uint32_t cfg;
234
235 if (sc == NULL)
236 return (ENXIO);
237
238 cfg = lpc_dmac_read_ch_4(sc, chno, LPC_DMAC_CH_CONFIG);
239 cfg |= LPC_DMAC_CH_CONFIG_E;
240
241 lpc_dmac_write_ch_4(sc, chno, LPC_DMAC_CH_CONFIG, cfg);
242
243 return 0;
244 }
245
246 int
247 lpc_dmac_disable_channel(device_t dev, int chno)
248 {
249 struct lpc_dmac_softc *sc = lpc_dmac_sc;
250 uint32_t cfg;
251
252 if (sc == NULL)
253 return (ENXIO);
254
255 cfg = lpc_dmac_read_ch_4(sc, chno, LPC_DMAC_CH_CONFIG);
256 cfg &= ~LPC_DMAC_CH_CONFIG_E;
257
258 lpc_dmac_write_ch_4(sc, chno, LPC_DMAC_CH_CONFIG, cfg);
259
260 return 0;
261 }
262
263 int
264 lpc_dmac_start_burst(device_t dev, int id)
265 {
266 struct lpc_dmac_softc *sc = lpc_dmac_sc;
267
268 lpc_dmac_write_4(sc, LPC_DMAC_SOFTBREQ, (1 << id));
269 return (0);
270 }
271
272 static device_method_t lpc_dmac_methods[] = {
273 /* Device interface */
274 DEVMETHOD(device_probe, lpc_dmac_probe),
275 DEVMETHOD(device_attach, lpc_dmac_attach),
276
277 { 0, 0 },
278 };
279
280 static devclass_t lpc_dmac_devclass;
281
282 static driver_t lpc_dmac_driver = {
283 "dmac",
284 lpc_dmac_methods,
285 sizeof(struct lpc_dmac_softc),
286 };
287
288 DRIVER_MODULE(dmac, simplebus, lpc_dmac_driver, lpc_dmac_devclass, 0, 0);
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