static int
bcmemmc_xfer_data_dma(struct sdhc_softc *sdhc_sc, struct sdmmc_command *cmd)
{
struct bcmemmc_softc * const sc = device_private(sdhc_sc->sc_dev);
kmutex_t *plock = sdhc_host_lock(sc->sc_hosts[0]);
size_t seg;
int error;
KASSERT(mutex_owned(plock));
for (seg = 0; seg < cmd->c_dmamap->dm_nsegs; seg++) {
sc->sc_cblk[seg].cb_ti =
__SHIFTIN(11, DMAC_TI_PERMAP); /* e.MMC */
sc->sc_cblk[seg].cb_txfr_len =
cmd->c_dmamap->dm_segs[seg].ds_len;
/*
* All transfers are assumed to be multiples of 32-bits.
*/
KASSERTMSG((sc->sc_cblk[seg].cb_txfr_len & 0x3) == 0,
"seg %zu len %d", seg, sc->sc_cblk[seg].cb_txfr_len);
if (ISSET(cmd->c_flags, SCF_CMD_READ)) {
sc->sc_cblk[seg].cb_ti |= DMAC_TI_DEST_INC;
/*
* Use 128-bit mode if transfer is a multiple of
* 16-bytes.
*/
if ((sc->sc_cblk[seg].cb_txfr_len & 0xf) == 0)
sc->sc_cblk[seg].cb_ti |= DMAC_TI_DEST_WIDTH;
sc->sc_cblk[seg].cb_ti |= DMAC_TI_SRC_DREQ;
sc->sc_cblk[seg].cb_source_ad =
BCM2835_PERIPHERALS_TO_BUS(sc->sc_physaddr +
SDHC_DATA);
sc->sc_cblk[seg].cb_dest_ad =
cmd->c_dmamap->dm_segs[seg].ds_addr;
} else {
sc->sc_cblk[seg].cb_ti |= DMAC_TI_SRC_INC;
/*
* Use 128-bit mode if transfer is a multiple of
* 16-bytes.
*/
if ((sc->sc_cblk[seg].cb_txfr_len & 0xf) == 0)
sc->sc_cblk[seg].cb_ti |= DMAC_TI_SRC_WIDTH;
sc->sc_cblk[seg].cb_ti |= DMAC_TI_DEST_DREQ;
sc->sc_cblk[seg].cb_ti |= DMAC_TI_WAIT_RESP;
sc->sc_cblk[seg].cb_source_ad =
cmd->c_dmamap->dm_segs[seg].ds_addr;
sc->sc_cblk[seg].cb_dest_ad =
BCM2835_PERIPHERALS_TO_BUS(sc->sc_physaddr +
SDHC_DATA);
}
sc->sc_cblk[seg].cb_stride = 0;
if (seg == cmd->c_dmamap->dm_nsegs - 1) {
sc->sc_cblk[seg].cb_ti |= DMAC_TI_INTEN;
sc->sc_cblk[seg].cb_nextconbk = 0;
} else {
sc->sc_cblk[seg].cb_nextconbk =
sc->sc_dmamap->dm_segs[0].ds_addr +
sizeof(struct bcm_dmac_conblk) * (seg+1);
}
sc->sc_cblk[seg].cb_padding[0] = 0;
sc->sc_cblk[seg].cb_padding[1] = 0;
}
bus_dmamap_sync(sc->sc.sc_dmat, sc->sc_dmamap, 0,
sc->sc_dmamap->dm_mapsize, BUS_DMASYNC_PREWRITE);
error = 0;
KASSERT(sc->sc_state == EMMC_DMA_STATE_IDLE);
sc->sc_state = EMMC_DMA_STATE_BUSY;
bcm_dmac_set_conblk_addr(sc->sc_dmac,
sc->sc_dmamap->dm_segs[0].ds_addr);
error = bcm_dmac_transfer(sc->sc_dmac);
if (error)
return error;
while (sc->sc_state == EMMC_DMA_STATE_BUSY) {
error = cv_timedwait(&sc->sc_cv, plock, hz * 10);
if (error == EWOULDBLOCK) {
device_printf(sc->sc.sc_dev, "transfer timeout!\n");
bcm_dmac_halt(sc->sc_dmac);
sc->sc_state = EMMC_DMA_STATE_IDLE;
error = ETIMEDOUT;
break;
}
}
bus_dmamap_sync(sc->sc.sc_dmat, sc->sc_dmamap, 0,
sc->sc_dmamap->dm_mapsize, BUS_DMASYNC_POSTWRITE);
return error;
}
void
bcm_dmac_halt(struct bcm_dmac_channel *ch)
{
bcm_dmac_set_conblk_addr(ch, 0);
}
