2 * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
28 * i.MX6 Smart Direct Memory Access Controller (sDMA)
29 * Chapter 41, i.MX 6Dual/6Quad Applications Processor Reference Manual,
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/param.h>
37 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/module.h>
41 #include <sys/malloc.h>
42 #include <sys/endian.h>
44 #include <sys/timeet.h>
45 #include <sys/timetc.h>
46 #include <sys/firmware.h>
49 #include <vm/vm_extern.h>
50 #include <vm/vm_kern.h>
53 #include <dev/ofw/openfirm.h>
54 #include <dev/ofw/ofw_bus.h>
55 #include <dev/ofw/ofw_bus_subr.h>
57 #include <machine/bus.h>
58 #include <machine/cpu.h>
59 #include <machine/intr.h>
61 #include <arm/freescale/imx/imx6_sdma.h>
63 #define MAX_BD (PAGE_SIZE / sizeof(struct sdma_buffer_descriptor))
65 #define READ4(_sc, _reg) \
66 bus_space_read_4(_sc->bst, _sc->bsh, _reg)
67 #define WRITE4(_sc, _reg, _val) \
68 bus_space_write_4(_sc->bst, _sc->bsh, _reg, _val)
70 struct sdma_softc *sdma_sc;
72 static struct resource_spec sdma_spec[] = {
73 { SYS_RES_MEMORY, 0, RF_ACTIVE },
74 { SYS_RES_IRQ, 0, RF_ACTIVE },
81 struct sdma_buffer_descriptor *bd;
82 struct sdma_channel *channel;
83 struct sdma_conf *conf;
84 struct sdma_softc *sc;
91 pending = READ4(sc, SDMAARM_INTR);
94 WRITE4(sc, SDMAARM_INTR, pending);
96 for (i = 0; i < SDMA_N_CHANNELS; i++) {
97 if ((pending & (1 << i)) == 0)
99 channel = &sc->channel[i];
100 conf = channel->conf;
103 for (j = 0; j < conf->num_bd; j++) {
104 bd = &channel->bd[j];
105 bd->mode.status |= BD_DONE;
106 if (bd->mode.status & BD_RROR)
107 printf("sDMA error\n");
110 conf->ih(conf->ih_user, 1);
112 WRITE4(sc, SDMAARM_HSTART, (1 << i));
117 sdma_probe(device_t dev)
120 if (!ofw_bus_status_okay(dev))
123 if (!ofw_bus_is_compatible(dev, "fsl,imx6q-sdma"))
126 device_set_desc(dev, "i.MX6 Smart Direct Memory Access Controller");
127 return (BUS_PROBE_DEFAULT);
133 struct sdma_softc *sc;
137 WRITE4(sc, SDMAARM_HSTART, (1 << chn));
145 struct sdma_softc *sc;
149 WRITE4(sc, SDMAARM_STOP_STAT, (1 << chn));
157 struct sdma_channel *channel;
158 struct sdma_softc *sc;
166 /* Channel 0 can't be used */
167 for (i = 1; i < SDMA_N_CHANNELS; i++) {
168 channel = &sc->channel[i];
169 if (channel->in_use == 0) {
181 /* Allocate area for buffer descriptors */
182 channel->bd = (void *)kmem_alloc_contig(PAGE_SIZE, M_ZERO, 0, ~0,
183 PAGE_SIZE, 0, VM_MEMATTR_UNCACHEABLE);
191 struct sdma_channel *channel;
192 struct sdma_softc *sc;
196 channel = &sc->channel[chn];
199 kmem_free((vm_offset_t)channel->bd, PAGE_SIZE);
205 sdma_overrides(struct sdma_softc *sc, int chn,
206 int evt, int host, int dsp)
210 /* Ignore sDMA requests */
211 reg = READ4(sc, SDMAARM_EVTOVR);
216 WRITE4(sc, SDMAARM_EVTOVR, reg);
218 /* Ignore enable bit (HE) */
219 reg = READ4(sc, SDMAARM_HOSTOVR);
224 WRITE4(sc, SDMAARM_HOSTOVR, reg);
226 /* Prevent sDMA channel from starting */
227 reg = READ4(sc, SDMAARM_DSPOVR);
232 WRITE4(sc, SDMAARM_DSPOVR, reg);
238 sdma_configure(int chn, struct sdma_conf *conf)
240 struct sdma_buffer_descriptor *bd0;
241 struct sdma_buffer_descriptor *bd;
242 struct sdma_context_data *context;
243 struct sdma_channel *channel;
244 struct sdma_softc *sc;
253 channel = &sc->channel[chn];
254 channel->conf = conf;
256 /* Ensure operation has stopped */
259 /* Set priority and enable the channel */
260 WRITE4(sc, SDMAARM_SDMA_CHNPRI(chn), 1);
261 WRITE4(sc, SDMAARM_CHNENBL(conf->event), (1 << chn));
263 sdma_overrides(sc, chn, 0, 0, 0);
265 if (conf->num_bd > MAX_BD) {
266 device_printf(sc->dev, "Error: too much buffer"
267 " descriptors requested\n");
271 for (i = 0; i < conf->num_bd; i++) {
272 bd = &channel->bd[i];
273 bd->mode.command = conf->command;
274 bd->mode.status = BD_DONE | BD_EXTD | BD_CONT | BD_INTR;
275 if (i == (conf->num_bd - 1))
276 bd->mode.status |= BD_WRAP;
277 bd->mode.count = conf->period;
278 bd->buffer_addr = conf->saddr + (conf->period * i);
279 bd->ext_buffer_addr = 0;
282 sc->ccb[chn].base_bd_ptr = vtophys(channel->bd);
283 sc->ccb[chn].current_bd_ptr = vtophys(channel->bd);
288 * i.MX6 Reference Manual: Appendix A SDMA Scripts
289 * A.3.1.7.1 (mcu_2_app)
293 * TODO: allow using other scripts
295 context = sc->context;
296 memset(context, 0, sizeof(*context));
297 context->channel_state.pc = sc->fw_scripts->mcu_2_app_addr;
300 * Tx FIFO 0 address (r6)
303 * Watermark level (r7)
306 if (conf->event > 32) {
307 context->gReg[0] = (1 << (conf->event % 32));
308 context->gReg[1] = 0;
310 context->gReg[0] = 0;
311 context->gReg[1] = (1 << conf->event);
314 context->gReg[6] = conf->daddr;
315 context->gReg[7] = conf->word_length;
318 bd0->mode.command = C0_SETDM;
319 bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
320 bd0->mode.count = sizeof(*context) / 4;
321 bd0->buffer_addr = sc->context_phys;
322 bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * chn;
324 WRITE4(sc, SDMAARM_HSTART, 1);
330 while (!(ret = READ4(sc, SDMAARM_INTR) & 1)) {
337 device_printf(sc->dev, "Failed to load context.\n");
341 WRITE4(sc, SDMAARM_INTR, ret);
343 device_printf(sc->dev, "Context loaded successfully.\n");
350 load_firmware(struct sdma_softc *sc)
352 const struct sdma_firmware_header *header;
353 const struct firmware *fp;
355 fp = firmware_get("sdma_fw");
357 device_printf(sc->dev, "Can't get firmware.\n");
362 if (header->magic != FW_HEADER_MAGIC) {
363 device_printf(sc->dev, "Can't use firmware.\n");
367 sc->fw_header = header;
368 sc->fw_scripts = (const void *)((const char *)header +
369 header->script_addrs_start);
375 boot_firmware(struct sdma_softc *sc)
377 struct sdma_buffer_descriptor *bd0;
378 const uint32_t *ram_code;
385 ram_code = (const void *)((const char *)sc->fw_header +
386 sc->fw_header->ram_code_start);
388 /* Make sure SDMA has not started yet */
389 WRITE4(sc, SDMAARM_MC0PTR, 0);
391 sz = SDMA_N_CHANNELS * sizeof(struct sdma_channel_control) + \
392 sizeof(struct sdma_context_data);
393 sc->ccb = (void *)kmem_alloc_contig(sz, M_ZERO, 0, ~0, PAGE_SIZE, 0,
394 VM_MEMATTR_UNCACHEABLE);
395 sc->ccb_phys = vtophys(sc->ccb);
397 sc->context = (void *)((char *)sc->ccb + \
398 SDMA_N_CHANNELS * sizeof(struct sdma_channel_control));
399 sc->context_phys = vtophys(sc->context);
401 /* Disable all the channels */
402 for (i = 0; i < SDMA_N_EVENTS; i++)
403 WRITE4(sc, SDMAARM_CHNENBL(i), 0);
405 /* All channels have priority 0 */
406 for (i = 0; i < SDMA_N_CHANNELS; i++)
407 WRITE4(sc, SDMAARM_SDMA_CHNPRI(i), 0);
409 /* Channel 0 is used for booting firmware */
412 sc->bd0 = (void *)kmem_alloc_contig(PAGE_SIZE, M_ZERO, 0, ~0, PAGE_SIZE,
413 0, VM_MEMATTR_UNCACHEABLE);
415 sc->ccb[chn].base_bd_ptr = vtophys(bd0);
416 sc->ccb[chn].current_bd_ptr = vtophys(bd0);
418 WRITE4(sc, SDMAARM_SDMA_CHNPRI(chn), 1);
420 sdma_overrides(sc, chn, 1, 0, 0);
422 /* XXX: not sure what is that */
423 WRITE4(sc, SDMAARM_CHN0ADDR, 0x4050);
425 WRITE4(sc, SDMAARM_CONFIG, 0);
426 WRITE4(sc, SDMAARM_MC0PTR, sc->ccb_phys);
427 WRITE4(sc, SDMAARM_CONFIG, CONFIG_CSM);
428 WRITE4(sc, SDMAARM_SDMA_CHNPRI(chn), 1);
430 bd0->mode.command = C0_SETPM;
431 bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
432 bd0->mode.count = sc->fw_header->ram_code_size / 2;
433 bd0->buffer_addr = vtophys(ram_code);
434 bd0->ext_buffer_addr = sc->fw_scripts->ram_code_start_addr;
436 WRITE4(sc, SDMAARM_HSTART, 1);
439 while (!(ret = READ4(sc, SDMAARM_INTR) & 1)) {
446 device_printf(sc->dev, "SDMA failed to boot\n");
450 WRITE4(sc, SDMAARM_INTR, ret);
453 device_printf(sc->dev, "SDMA booted successfully.\n");
456 /* Debug is disabled */
457 WRITE4(sc, SDMAARM_ONCE_ENB, 0);
463 sdma_attach(device_t dev)
465 struct sdma_softc *sc;
468 sc = device_get_softc(dev);
471 if (bus_alloc_resources(dev, sdma_spec, sc->res)) {
472 device_printf(dev, "could not allocate resources\n");
476 /* Memory interface */
477 sc->bst = rman_get_bustag(sc->res[0]);
478 sc->bsh = rman_get_bushandle(sc->res[0]);
482 /* Setup interrupt handler */
483 err = bus_setup_intr(dev, sc->res[1], INTR_TYPE_MISC | INTR_MPSAFE,
484 NULL, sdma_intr, sc, &sc->ih);
486 device_printf(dev, "Unable to alloc interrupt resource.\n");
490 if (load_firmware(sc) == -1)
493 if (boot_firmware(sc) == -1)
499 static device_method_t sdma_methods[] = {
500 /* Device interface */
501 DEVMETHOD(device_probe, sdma_probe),
502 DEVMETHOD(device_attach, sdma_attach),
506 static driver_t sdma_driver = {
509 sizeof(struct sdma_softc),
512 static devclass_t sdma_devclass;
514 EARLY_DRIVER_MODULE(sdma, simplebus, sdma_driver, sdma_devclass, 0, 0,