2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/module.h>
39 #include <sys/mutex.h>
41 #include <sys/sysctl.h>
42 #include <sys/taskqueue.h>
44 #include <machine/bus.h>
46 #include <dev/ofw/ofw_bus.h>
47 #include <dev/ofw/ofw_bus_subr.h>
49 #include <dev/mmc/bridge.h>
50 #include <dev/mmc/mmcreg.h>
52 #include <dev/sdhci/sdhci.h>
57 #include "opt_mmccam.h"
59 #include "bcm2835_dma.h"
60 #include <arm/broadcom/bcm2835/bcm2835_mbox_prop.h>
62 #include <arm/broadcom/bcm2835/bcm2835_clkman.h>
64 #include <arm/broadcom/bcm2835/bcm2835_vcbus.h>
66 #define BCM2835_DEFAULT_SDHCI_FREQ 50
67 #define BCM2838_DEFAULT_SDHCI_FREQ 100
69 #define BCM_SDHCI_BUFFER_SIZE 512
71 * NUM_DMA_SEGS is the number of DMA segments we want to accommodate on average.
72 * We add in a number of segments based on how much we may need to spill into
73 * another segment due to crossing page boundaries. e.g. up to PAGE_SIZE, an
74 * extra page is needed as we can cross a page boundary exactly once.
76 #define NUM_DMA_SEGS 1
77 #define NUM_DMA_SPILL_SEGS \
78 ((((NUM_DMA_SEGS * BCM_SDHCI_BUFFER_SIZE) - 1) / PAGE_SIZE) + 1)
79 #define ALLOCATED_DMA_SEGS (NUM_DMA_SEGS + NUM_DMA_SPILL_SEGS)
80 #define BCM_DMA_MAXSIZE (NUM_DMA_SEGS * BCM_SDHCI_BUFFER_SIZE)
82 #define BCM_SDHCI_SLOT_LEFT(slot) \
83 ((slot)->curcmd->data->len - (slot)->offset)
85 #define BCM_SDHCI_SEGSZ_LEFT(slot) \
86 min(BCM_DMA_MAXSIZE, \
87 rounddown(BCM_SDHCI_SLOT_LEFT(slot), BCM_SDHCI_BUFFER_SIZE))
89 #define DATA_PENDING_MASK (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL)
90 #define DATA_XFER_MASK (DATA_PENDING_MASK | SDHCI_INT_DATA_END)
93 static int bcm2835_sdhci_debug = 0;
95 TUNABLE_INT("hw.bcm2835.sdhci.debug", &bcm2835_sdhci_debug);
96 SYSCTL_INT(_hw_sdhci, OID_AUTO, bcm2835_sdhci_debug, CTLFLAG_RWTUN,
97 &bcm2835_sdhci_debug, 0, "bcm2835 SDHCI debug level");
99 #define dprintf(fmt, args...) \
101 if (bcm2835_sdhci_debug) \
102 printf("%s: " fmt, __func__, ##args); \
105 #define dprintf(fmt, args...)
108 static int bcm2835_sdhci_hs = 1;
109 static int bcm2835_sdhci_pio_mode = 0;
111 struct bcm_mmc_conf {
119 struct bcm_mmc_conf bcm2835_sdhci_conf = {
120 .clock_id = BCM2835_MBOX_CLOCK_ID_EMMC,
122 .default_freq = BCM2835_DEFAULT_SDHCI_FREQ,
123 .quirks = SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
124 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL | SDHCI_QUIRK_DONT_SET_HISPD_BIT |
125 SDHCI_QUIRK_MISSING_CAPS,
129 struct bcm_mmc_conf bcm2838_emmc2_conf = {
130 .clock_id = BCM2838_MBOX_CLOCK_ID_EMMC2,
132 .default_freq = BCM2838_DEFAULT_SDHCI_FREQ,
134 /* XXX DMA is currently broken, but it shouldn't be. */
138 static struct ofw_compat_data compat_data[] = {
139 {"broadcom,bcm2835-sdhci", (uintptr_t)&bcm2835_sdhci_conf},
140 {"brcm,bcm2835-sdhci", (uintptr_t)&bcm2835_sdhci_conf},
141 {"brcm,bcm2835-mmc", (uintptr_t)&bcm2835_sdhci_conf},
142 {"brcm,bcm2711-emmc2", (uintptr_t)&bcm2838_emmc2_conf},
143 {"brcm,bcm2838-emmc2", (uintptr_t)&bcm2838_emmc2_conf},
147 TUNABLE_INT("hw.bcm2835.sdhci.hs", &bcm2835_sdhci_hs);
148 TUNABLE_INT("hw.bcm2835.sdhci.pio_mode", &bcm2835_sdhci_pio_mode);
150 struct bcm_sdhci_softc {
152 struct resource * sc_mem_res;
153 struct resource * sc_irq_res;
154 bus_space_tag_t sc_bst;
155 bus_space_handle_t sc_bsh;
157 struct mmc_request * sc_req;
158 struct sdhci_slot sc_slot;
160 bus_dma_tag_t sc_dma_tag;
161 bus_dmamap_t sc_dma_map;
162 vm_paddr_t sc_sdhci_buffer_phys;
163 bus_addr_t dmamap_seg_addrs[ALLOCATED_DMA_SEGS];
164 bus_size_t dmamap_seg_sizes[ALLOCATED_DMA_SEGS];
165 int dmamap_seg_count;
166 int dmamap_seg_index;
168 uint32_t blksz_and_count;
169 uint32_t cmd_and_mode;
170 bool need_update_blk;
174 struct bcm_mmc_conf * conf;
177 static int bcm_sdhci_probe(device_t);
178 static int bcm_sdhci_attach(device_t);
179 static int bcm_sdhci_detach(device_t);
180 static void bcm_sdhci_intr(void *);
182 static int bcm_sdhci_get_ro(device_t, device_t);
183 static void bcm_sdhci_dma_intr(int ch, void *arg);
184 static void bcm_sdhci_start_dma(struct sdhci_slot *slot);
187 bcm_sdhci_dmacb(void *arg, bus_dma_segment_t *segs, int nseg, int err)
189 struct bcm_sdhci_softc *sc = arg;
192 /* Sanity check: we can only ever have one mapping at a time. */
193 KASSERT(sc->dmamap_seg_count == 0, ("leaked DMA segment"));
194 sc->dmamap_status = err;
195 sc->dmamap_seg_count = nseg;
197 /* Note nseg is guaranteed to be zero if err is non-zero. */
198 for (i = 0; i < nseg; i++) {
199 sc->dmamap_seg_addrs[i] = segs[i].ds_addr;
200 sc->dmamap_seg_sizes[i] = segs[i].ds_len;
205 bcm_sdhci_probe(device_t dev)
208 if (!ofw_bus_status_okay(dev))
211 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
214 device_set_desc(dev, "Broadcom 2708 SDHCI controller");
216 return (BUS_PROBE_DEFAULT);
220 bcm_sdhci_attach(device_t dev)
222 struct bcm_sdhci_softc *sc = device_get_softc(dev);
231 sc->conf = (struct bcm_mmc_conf *)ofw_bus_search_compatible(dev,
232 compat_data)->ocd_data;
236 err = bcm2835_mbox_set_power_state(BCM2835_MBOX_POWER_ID_EMMC, TRUE);
239 device_printf(dev, "Unable to enable the power\n");
244 err = bcm2835_mbox_get_clock_rate(sc->conf->clock_id, &default_freq);
247 default_freq /= 1000000;
249 if (default_freq == 0) {
250 node = ofw_bus_get_node(sc->sc_dev);
251 if ((OF_getencprop(node, "clock-frequency", &cell,
253 default_freq = cell / 1000000;
255 if (default_freq == 0)
256 default_freq = sc->conf->default_freq;
259 device_printf(dev, "SDHCI frequency: %dMHz\n", default_freq);
261 if (sc->conf->clock_src > 0) {
263 sc->clkman = devclass_get_device(
264 devclass_find("bcm2835_clkman"), 0);
265 if (sc->clkman == NULL) {
266 device_printf(dev, "cannot find Clock Manager\n");
270 f = bcm2835_clkman_set_frequency(sc->clkman,
271 sc->conf->clock_src, default_freq);
276 device_printf(dev, "Clock source frequency: %dMHz\n",
282 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
284 if (!sc->sc_mem_res) {
285 device_printf(dev, "cannot allocate memory window\n");
290 sc->sc_bst = rman_get_bustag(sc->sc_mem_res);
291 sc->sc_bsh = rman_get_bushandle(sc->sc_mem_res);
294 sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
295 RF_ACTIVE | RF_SHAREABLE);
296 if (!sc->sc_irq_res) {
297 device_printf(dev, "cannot allocate interrupt\n");
302 if (bus_setup_intr(dev, sc->sc_irq_res, INTR_TYPE_BIO | INTR_MPSAFE,
303 NULL, bcm_sdhci_intr, sc, &sc->sc_intrhand)) {
304 device_printf(dev, "cannot setup interrupt handler\n");
309 if (!bcm2835_sdhci_pio_mode)
310 sc->sc_slot.opt = SDHCI_PLATFORM_TRANSFER;
312 sc->sc_slot.caps = SDHCI_CAN_VDD_330 | SDHCI_CAN_VDD_180;
313 if (bcm2835_sdhci_hs)
314 sc->sc_slot.caps |= SDHCI_CAN_DO_HISPD;
315 sc->sc_slot.caps |= (default_freq << SDHCI_CLOCK_BASE_SHIFT);
316 sc->sc_slot.quirks = sc->conf->quirks;
318 sdhci_init_slot(dev, &sc->sc_slot, 0);
320 if (sc->conf->use_dma) {
321 sc->sc_dma_ch = bcm_dma_allocate(BCM_DMA_CH_ANY);
322 if (sc->sc_dma_ch == BCM_DMA_CH_INVALID)
325 err = bcm_dma_setup_intr(sc->sc_dma_ch, bcm_sdhci_dma_intr, sc);
328 "cannot setup dma interrupt handler\n");
333 /* Allocate bus_dma resources. */
334 err = bus_dma_tag_create(bus_get_dma_tag(dev),
335 1, 0, bcm283x_dmabus_peripheral_lowaddr(),
336 BUS_SPACE_MAXADDR, NULL, NULL,
337 BCM_DMA_MAXSIZE, ALLOCATED_DMA_SEGS, BCM_SDHCI_BUFFER_SIZE,
338 BUS_DMA_ALLOCNOW, NULL, NULL,
342 device_printf(dev, "failed allocate DMA tag");
346 err = bus_dmamap_create(sc->sc_dma_tag, 0, &sc->sc_dma_map);
348 device_printf(dev, "bus_dmamap_create failed\n");
353 /* FIXME: Fix along with other BUS_SPACE_PHYSADDR instances */
354 sc->sc_sdhci_buffer_phys = rman_get_start(sc->sc_mem_res) +
357 bus_generic_probe(dev);
358 bus_generic_attach(dev);
360 sdhci_start_slot(&sc->sc_slot);
362 /* Seed our copies. */
363 sc->blksz_and_count = SDHCI_READ_4(dev, &sc->sc_slot, SDHCI_BLOCK_SIZE);
364 sc->cmd_and_mode = SDHCI_READ_4(dev, &sc->sc_slot, SDHCI_TRANSFER_MODE);
370 bus_teardown_intr(dev, sc->sc_irq_res, sc->sc_intrhand);
372 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq_res);
374 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
380 bcm_sdhci_detach(device_t dev)
387 bcm_sdhci_intr(void *arg)
389 struct bcm_sdhci_softc *sc = arg;
391 sdhci_generic_intr(&sc->sc_slot);
395 bcm_sdhci_get_ro(device_t bus, device_t child)
401 static inline uint32_t
402 RD4(struct bcm_sdhci_softc *sc, bus_size_t off)
404 uint32_t val = bus_space_read_4(sc->sc_bst, sc->sc_bsh, off);
409 WR4(struct bcm_sdhci_softc *sc, bus_size_t off, uint32_t val)
412 bus_space_write_4(sc->sc_bst, sc->sc_bsh, off, val);
414 * The Arasan HC has a bug where it may lose the content of
415 * consecutive writes to registers that are within two SD-card
416 * clock cycles of each other (a clock domain crossing problem).
418 if (sc->sc_slot.clock > 0)
419 DELAY(((2 * 1000000) / sc->sc_slot.clock) + 1);
423 bcm_sdhci_read_1(device_t dev, struct sdhci_slot *slot, bus_size_t off)
425 struct bcm_sdhci_softc *sc = device_get_softc(dev);
426 uint32_t val = RD4(sc, off & ~3);
428 return ((val >> (off & 3)*8) & 0xff);
432 bcm_sdhci_read_2(device_t dev, struct sdhci_slot *slot, bus_size_t off)
434 struct bcm_sdhci_softc *sc = device_get_softc(dev);
438 * Standard 32-bit handling of command and transfer mode, as
439 * well as block size and count.
441 if ((off == SDHCI_BLOCK_SIZE || off == SDHCI_BLOCK_COUNT) &&
443 val32 = sc->blksz_and_count;
444 else if (off == SDHCI_TRANSFER_MODE || off == SDHCI_COMMAND_FLAGS)
445 val32 = sc->cmd_and_mode;
447 val32 = RD4(sc, off & ~3);
449 return ((val32 >> (off & 3)*8) & 0xffff);
453 bcm_sdhci_read_4(device_t dev, struct sdhci_slot *slot, bus_size_t off)
455 struct bcm_sdhci_softc *sc = device_get_softc(dev);
461 bcm_sdhci_read_multi_4(device_t dev, struct sdhci_slot *slot, bus_size_t off,
462 uint32_t *data, bus_size_t count)
464 struct bcm_sdhci_softc *sc = device_get_softc(dev);
466 bus_space_read_multi_4(sc->sc_bst, sc->sc_bsh, off, data, count);
470 bcm_sdhci_write_1(device_t dev, struct sdhci_slot *slot, bus_size_t off,
473 struct bcm_sdhci_softc *sc = device_get_softc(dev);
474 uint32_t val32 = RD4(sc, off & ~3);
475 val32 &= ~(0xff << (off & 3)*8);
476 val32 |= (val << (off & 3)*8);
477 WR4(sc, off & ~3, val32);
481 bcm_sdhci_write_2(device_t dev, struct sdhci_slot *slot, bus_size_t off,
484 struct bcm_sdhci_softc *sc = device_get_softc(dev);
488 * If we have a queued up 16bit value for blk size or count, use and
489 * update the saved value rather than doing any real register access.
490 * If we did not touch either since the last write, then read from
491 * register as at least block count can change.
492 * Similarly, if we are about to issue a command, always use the saved
493 * value for transfer mode as we can never write that without issuing
496 if ((off == SDHCI_BLOCK_SIZE || off == SDHCI_BLOCK_COUNT) &&
498 val32 = sc->blksz_and_count;
499 else if (off == SDHCI_COMMAND_FLAGS)
500 val32 = sc->cmd_and_mode;
502 val32 = RD4(sc, off & ~3);
504 val32 &= ~(0xffff << (off & 3)*8);
505 val32 |= (val << (off & 3)*8);
507 if (off == SDHCI_TRANSFER_MODE)
508 sc->cmd_and_mode = val32;
509 else if (off == SDHCI_BLOCK_SIZE || off == SDHCI_BLOCK_COUNT) {
510 sc->blksz_and_count = val32;
511 sc->need_update_blk = true;
513 if (off == SDHCI_COMMAND_FLAGS) {
514 /* If we saved blk writes, do them now before cmd. */
515 if (sc->need_update_blk) {
516 WR4(sc, SDHCI_BLOCK_SIZE, sc->blksz_and_count);
517 sc->need_update_blk = false;
519 /* Always save cmd and mode registers. */
520 sc->cmd_and_mode = val32;
522 WR4(sc, off & ~3, val32);
527 bcm_sdhci_write_4(device_t dev, struct sdhci_slot *slot, bus_size_t off,
530 struct bcm_sdhci_softc *sc = device_get_softc(dev);
535 bcm_sdhci_write_multi_4(device_t dev, struct sdhci_slot *slot, bus_size_t off,
536 uint32_t *data, bus_size_t count)
538 struct bcm_sdhci_softc *sc = device_get_softc(dev);
540 bus_space_write_multi_4(sc->sc_bst, sc->sc_bsh, off, data, count);
544 bcm_sdhci_start_dma_seg(struct bcm_sdhci_softc *sc)
546 struct sdhci_slot *slot;
547 vm_paddr_t pdst, psrc;
548 int err, idx, len, sync_op, width;
551 mtx_assert(&slot->mtx, MA_OWNED);
552 idx = sc->dmamap_seg_index++;
553 len = sc->dmamap_seg_sizes[idx];
555 width = (len & 0xf ? BCM_DMA_32BIT : BCM_DMA_128BIT);
557 if (slot->curcmd->data->flags & MMC_DATA_READ) {
558 bcm_dma_setup_src(sc->sc_dma_ch, BCM_DMA_DREQ_EMMC,
559 BCM_DMA_SAME_ADDR, BCM_DMA_32BIT);
560 bcm_dma_setup_dst(sc->sc_dma_ch, BCM_DMA_DREQ_NONE,
561 BCM_DMA_INC_ADDR, width);
562 psrc = sc->sc_sdhci_buffer_phys;
563 pdst = sc->dmamap_seg_addrs[idx];
564 sync_op = BUS_DMASYNC_PREREAD;
566 bcm_dma_setup_src(sc->sc_dma_ch, BCM_DMA_DREQ_NONE,
567 BCM_DMA_INC_ADDR, width);
568 bcm_dma_setup_dst(sc->sc_dma_ch, BCM_DMA_DREQ_EMMC,
569 BCM_DMA_SAME_ADDR, BCM_DMA_32BIT);
570 psrc = sc->dmamap_seg_addrs[idx];
571 pdst = sc->sc_sdhci_buffer_phys;
572 sync_op = BUS_DMASYNC_PREWRITE;
576 * When starting a new DMA operation do the busdma sync operation, and
577 * disable SDCHI data interrrupts because we'll be driven by DMA
578 * interrupts (or SDHCI error interrupts) until the IO is done.
581 bus_dmamap_sync(sc->sc_dma_tag, sc->sc_dma_map, sync_op);
583 slot->intmask &= ~DATA_XFER_MASK;
584 bcm_sdhci_write_4(sc->sc_dev, slot, SDHCI_SIGNAL_ENABLE,
589 * Start the DMA transfer. Only programming errors (like failing to
590 * allocate a channel) cause a non-zero return from bcm_dma_start().
592 err = bcm_dma_start(sc->sc_dma_ch, psrc, pdst, len);
593 KASSERT((err == 0), ("bcm2835_sdhci: failed DMA start"));
597 bcm_sdhci_dma_exit(struct bcm_sdhci_softc *sc)
599 struct sdhci_slot *slot = &sc->sc_slot;
601 mtx_assert(&slot->mtx, MA_OWNED);
603 /* Re-enable interrupts */
604 slot->intmask |= DATA_XFER_MASK;
605 bcm_sdhci_write_4(slot->bus, slot, SDHCI_SIGNAL_ENABLE,
610 bcm_sdhci_dma_unload(struct bcm_sdhci_softc *sc)
612 struct sdhci_slot *slot = &sc->sc_slot;
614 if (sc->dmamap_seg_count == 0)
616 if ((slot->curcmd->data->flags & MMC_DATA_READ) != 0)
617 bus_dmamap_sync(sc->sc_dma_tag, sc->sc_dma_map,
618 BUS_DMASYNC_POSTREAD);
620 bus_dmamap_sync(sc->sc_dma_tag, sc->sc_dma_map,
621 BUS_DMASYNC_POSTWRITE);
622 bus_dmamap_unload(sc->sc_dma_tag, sc->sc_dma_map);
624 sc->dmamap_seg_count = 0;
625 sc->dmamap_seg_index = 0;
629 bcm_sdhci_dma_intr(int ch, void *arg)
631 struct bcm_sdhci_softc *sc = (struct bcm_sdhci_softc *)arg;
632 struct sdhci_slot *slot = &sc->sc_slot;
635 mtx_lock(&slot->mtx);
636 if (slot->curcmd == NULL)
639 * If there are more segments for the current dma, start the next one.
640 * Otherwise unload the dma map and decide what to do next based on the
641 * status of the sdhci controller and whether there's more data left.
643 if (sc->dmamap_seg_index < sc->dmamap_seg_count) {
644 bcm_sdhci_start_dma_seg(sc);
648 bcm_sdhci_dma_unload(sc);
651 * If we had no further segments pending, we need to determine how to
652 * proceed next. If the 'data/space pending' bit is already set and we
653 * can continue via DMA, do so. Otherwise, re-enable interrupts and
656 reg = bcm_sdhci_read_4(slot->bus, slot, SDHCI_INT_STATUS);
657 if ((reg & DATA_PENDING_MASK) != 0 &&
658 BCM_SDHCI_SEGSZ_LEFT(slot) >= BCM_SDHCI_BUFFER_SIZE) {
659 /* ACK any pending interrupts */
660 bcm_sdhci_write_4(slot->bus, slot, SDHCI_INT_STATUS,
663 bcm_sdhci_start_dma(slot);
664 if (slot->curcmd->error != 0) {
665 /* We won't recover from this error for this command. */
666 bcm_sdhci_dma_unload(sc);
667 bcm_sdhci_dma_exit(sc);
668 sdhci_finish_data(slot);
670 } else if ((reg & SDHCI_INT_DATA_END) != 0) {
671 bcm_sdhci_dma_exit(sc);
672 bcm_sdhci_write_4(slot->bus, slot, SDHCI_INT_STATUS,
674 slot->flags &= ~PLATFORM_DATA_STARTED;
675 sdhci_finish_data(slot);
677 bcm_sdhci_dma_exit(sc);
680 mtx_unlock(&slot->mtx);
684 bcm_sdhci_start_dma(struct sdhci_slot *slot)
686 struct bcm_sdhci_softc *sc = device_get_softc(slot->bus);
690 mtx_assert(&slot->mtx, MA_OWNED);
692 left = BCM_SDHCI_SEGSZ_LEFT(slot);
693 buf = (uint8_t *)slot->curcmd->data->data + slot->offset;
695 ("%s: DMA handling incorrectly indicated", __func__));
698 * No need to check segment count here; if we've not yet unloaded
699 * previous segments, we'll catch that in bcm_sdhci_dmacb.
701 if (bus_dmamap_load(sc->sc_dma_tag, sc->sc_dma_map, buf, left,
702 bcm_sdhci_dmacb, sc, BUS_DMA_NOWAIT) != 0 ||
703 sc->dmamap_status != 0) {
704 slot->curcmd->error = MMC_ERR_NO_MEMORY;
709 bcm_sdhci_start_dma_seg(sc);
713 bcm_sdhci_will_handle_transfer(device_t dev, struct sdhci_slot *slot)
715 struct bcm_sdhci_softc *sc = device_get_softc(slot->bus);
717 if (!sc->conf->use_dma)
721 * This indicates that we somehow let a data interrupt slip by into the
722 * SDHCI framework, when it should not have. This really needs to be
723 * caught and fixed ASAP, as it really shouldn't happen.
725 KASSERT(sc->dmamap_seg_count == 0,
726 ("data pending interrupt pushed through SDHCI framework"));
729 * Do not use DMA for transfers less than our block size. Checking
730 * alignment serves little benefit, as we round transfer sizes down to
731 * a multiple of the block size and push the transfer back to
732 * SDHCI-driven PIO once we're below the block size.
734 if (BCM_SDHCI_SEGSZ_LEFT(slot) < BCM_DMA_BLOCK_SIZE)
741 bcm_sdhci_start_transfer(device_t dev, struct sdhci_slot *slot,
745 /* DMA transfer FIFO 1KB */
746 bcm_sdhci_start_dma(slot);
750 bcm_sdhci_finish_transfer(device_t dev, struct sdhci_slot *slot)
752 struct bcm_sdhci_softc *sc = device_get_softc(slot->bus);
755 * Clean up. Interrupts are clearly enabled, because we received an
756 * SDHCI_INT_DATA_END to get this far -- just make sure we don't leave
757 * anything laying around.
759 if (sc->dmamap_seg_count != 0) {
761 * Our segment math should have worked out such that we would
762 * never finish the transfer without having used up all of the
763 * segments. If we haven't, that means we must have erroneously
764 * regressed to SDHCI-driven PIO to finish the operation and
765 * this is certainly caused by developer-error.
767 bcm_sdhci_dma_unload(sc);
770 sdhci_finish_data(slot);
773 static device_method_t bcm_sdhci_methods[] = {
774 /* Device interface */
775 DEVMETHOD(device_probe, bcm_sdhci_probe),
776 DEVMETHOD(device_attach, bcm_sdhci_attach),
777 DEVMETHOD(device_detach, bcm_sdhci_detach),
780 DEVMETHOD(bus_read_ivar, sdhci_generic_read_ivar),
781 DEVMETHOD(bus_write_ivar, sdhci_generic_write_ivar),
782 DEVMETHOD(bus_add_child, bus_generic_add_child),
784 /* MMC bridge interface */
785 DEVMETHOD(mmcbr_update_ios, sdhci_generic_update_ios),
786 DEVMETHOD(mmcbr_request, sdhci_generic_request),
787 DEVMETHOD(mmcbr_get_ro, bcm_sdhci_get_ro),
788 DEVMETHOD(mmcbr_acquire_host, sdhci_generic_acquire_host),
789 DEVMETHOD(mmcbr_release_host, sdhci_generic_release_host),
791 /* Platform transfer methods */
792 DEVMETHOD(sdhci_platform_will_handle, bcm_sdhci_will_handle_transfer),
793 DEVMETHOD(sdhci_platform_start_transfer, bcm_sdhci_start_transfer),
794 DEVMETHOD(sdhci_platform_finish_transfer, bcm_sdhci_finish_transfer),
795 /* SDHCI registers accessors */
796 DEVMETHOD(sdhci_read_1, bcm_sdhci_read_1),
797 DEVMETHOD(sdhci_read_2, bcm_sdhci_read_2),
798 DEVMETHOD(sdhci_read_4, bcm_sdhci_read_4),
799 DEVMETHOD(sdhci_read_multi_4, bcm_sdhci_read_multi_4),
800 DEVMETHOD(sdhci_write_1, bcm_sdhci_write_1),
801 DEVMETHOD(sdhci_write_2, bcm_sdhci_write_2),
802 DEVMETHOD(sdhci_write_4, bcm_sdhci_write_4),
803 DEVMETHOD(sdhci_write_multi_4, bcm_sdhci_write_multi_4),
808 static devclass_t bcm_sdhci_devclass;
810 static driver_t bcm_sdhci_driver = {
813 sizeof(struct bcm_sdhci_softc),
816 DRIVER_MODULE(sdhci_bcm, simplebus, bcm_sdhci_driver, bcm_sdhci_devclass,
819 MODULE_DEPEND(sdhci_bcm, bcm2835_clkman, 1, 1, 1);
821 SDHCI_DEPEND(sdhci_bcm);
823 MMC_DECLARE_BRIDGE(sdhci_bcm);