On 15/09/2014 16:50, Ludovic Desroches : > New atmel DMA controller known as XDMAC, introduced with SAMA5D4 > devices. > > Signed-off-by: Ludovic Desroches <ludovic.desroches@xxxxxxxxx> > --- > drivers/dma/Kconfig | 7 + > drivers/dma/Makefile | 1 + > drivers/dma/at_xdmac.c | 1210 ++++++++++++++++++++++++++++++++++++++++ > drivers/dma/at_xdmac.h | 307 ++++++++++ > include/dt-bindings/dma/at91.h | 25 + > 5 files changed, 1550 insertions(+) > create mode 100644 drivers/dma/at_xdmac.c > create mode 100644 drivers/dma/at_xdmac.h > > diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig > index 9b1ea0e..d04e79a 100644 > --- a/drivers/dma/Kconfig > +++ b/drivers/dma/Kconfig > @@ -107,6 +107,13 @@ config AT_HDMAC > help > Support the Atmel AHB DMA controller. > > +config AT_XDMAC > + tristate "Atmel XDMA support" > + depends on ARCH_AT91 > + select DMA_ENGINE > + help > + Support the Atmel XDMA controller. > + > config FSL_DMA > tristate "Freescale Elo series DMA support" > depends on FSL_SOC > diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile > index c6adb92..f32bfe1 100644 > --- a/drivers/dma/Makefile > +++ b/drivers/dma/Makefile > @@ -17,6 +17,7 @@ obj-$(CONFIG_PPC_BESTCOMM) += bestcomm/ > obj-$(CONFIG_MV_XOR) += mv_xor.o > obj-$(CONFIG_DW_DMAC_CORE) += dw/ > obj-$(CONFIG_AT_HDMAC) += at_hdmac.o > +obj-$(CONFIG_AT_XDMAC) += at_xdmac.o > obj-$(CONFIG_MX3_IPU) += ipu/ > obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o > obj-$(CONFIG_SH_DMAE_BASE) += sh/ > diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c > new file mode 100644 > index 0000000..9c7af22 > --- /dev/null > +++ b/drivers/dma/at_xdmac.c > @@ -0,0 +1,1210 @@ > +/* > + * Driver for the Atmel Extensible DMA Controller (aka XDMAC on AT91 systems) > + * > + * Copyright (C) 2014 Atmel Corporation > + * > + * Author: Ludovic Desroches <ludovic.desroches@xxxxxxxxx> > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License version 2 as published by > + * the Free Software Foundation. > + * > + * This program is distributed in the hope that it will be useful, but WITHOUT > + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or > + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for > + * more details. > + * > + * You should have received a copy of the GNU General Public License along with > + * this program. If not, see <http://www.gnu.org/licenses/>. > + */ > + > +#include <dt-bindings/dma/at91.h> > +#include <linux/clk.h> > +#include <linux/dmaengine.h> > +#include <linux/dmapool.h> > +#include <linux/interrupt.h> > +#include <linux/irq.h> > +#include <linux/list.h> > +#include <linux/module.h> > +#include <linux/of_dma.h> > +#include <linux/of_platform.h> > +#include <linux/platform_device.h> > +#include <linux/pm.h> > + > +#include "dmaengine.h" > +#include "at_xdmac.h" > + > +static unsigned int init_nr_desc_per_channel = 64; > +module_param(init_nr_desc_per_channel, uint, 0644); > +MODULE_PARM_DESC(init_nr_desc_per_channel, > + "initial descriptors per channel (default: 64)"); > + > + > +static bool at_xdmac_chan_is_enabled(struct at_xdmac_chan *atchan) > +{ > + return at_xdmac_chan_read(atchan, AT_XDMAC_GS) & atchan->mask; > +} > + > +static void at_xdmac_off(struct at_xdmac *atxdmac) > +{ > + at_xdmac_write(atxdmac, AT_XDMAC_GD, -1L); > + > + /* Wait that all chans are disabled. */ > + while (at_xdmac_read(atxdmac, AT_XDMAC_GS)) > + cpu_relax(); > + at_xdmac_write(atxdmac, AT_XDMAC_GID, -1L); > +} > + > +/* Call with lock hold. */ > +static void at_xdmac_start_xfer(struct at_xdmac_chan *atchan, > + struct at_xdmac_desc *first) > +{ > + struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); > + u32 reg; > + > + dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, first); > + > + if (at_xdmac_chan_is_enabled(atchan)) > + return; > + > + /* Set transfer as active to not try to start it again. */ > + first->active_xfer = true; > + > + /* Tell xdmac where to get the first descriptor. */ > + reg = AT_XDMAC_CNDA_NDA(first->tx_dma_desc.phys) > + | AT_XDMAC_CNDA_NDAIF(atchan->memif); > + at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, reg); > + > + /* > + * When doing memory to memory transfer we need to use the next > + * descriptor view 2 since some fields of the configuration register > + * depend on transfer size and src/dest addresses. > + */ > + if (atchan->cfg & AT_XDMAC_CC_TYPE_PER_TRAN) { > + reg = AT_XDMAC_CNDC_NDVIEW_NDV1; > + at_xdmac_chan_write(atchan, AT_XDMAC_CC, atchan->cfg); > + } else Style: we need {} even in the alternative. > + reg = AT_XDMAC_CNDC_NDVIEW_NDV2; > + > + reg |= AT_XDMAC_CNDC_NDDUP > + | AT_XDMAC_CNDC_NDSUP > + | AT_XDMAC_CNDC_NDE; > + at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, reg); > + > + dev_vdbg(chan2dev(&atchan->chan), > + "%s: XDMAC_CC=0x%08x XDMAC_CNDA=0x%08x, XDMAC_CNDC=0x%08x, " > + "XDMAC_CSA=0x%08x, XDMAC_CDA=0x%08x, XDMAC_CUBC=0x%08x\n", > + __func__, at_xdmac_chan_read(atchan, AT_XDMAC_CC), > + at_xdmac_chan_read(atchan, AT_XDMAC_CNDA), > + at_xdmac_chan_read(atchan, AT_XDMAC_CNDC), > + at_xdmac_chan_read(atchan, AT_XDMAC_CSA), > + at_xdmac_chan_read(atchan, AT_XDMAC_CDA), > + at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); > + > + /* > + * There is no end of list when doing cyclic dma, we need to get > + * an interrupt after each periods. > + */ > + if (at_xdmac_chan_is_cyclic(atchan)) > + at_xdmac_chan_write(atchan, AT_XDMAC_CIE, AT_XDMAC_CIE_BIE); > + else > + at_xdmac_chan_write(atchan, AT_XDMAC_CIE, AT_XDMAC_CIE_LIE); > + at_xdmac_write(atxdmac, AT_XDMAC_GIE, atchan->mask); > + dev_vdbg(chan2dev(&atchan->chan), > + "%s: enable channel (0x%08x)\n", __func__, atchan->mask); After having read the remark from Arnd and as we discussed together, a write memory barrier seems needed here. > + at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask); > + > + dev_vdbg(chan2dev(&atchan->chan), > + "%s: XDMAC_CC=0x%08x XDMAC_CNDA=0x%08x, XDMAC_CNDC=0x%08x, " > + "XDMAC_CSA=0x%08x, XDMAC_CDA=0x%08x, XDMAC_CUBC=0x%08x\n", > + __func__, at_xdmac_chan_read(atchan, AT_XDMAC_CC), > + at_xdmac_chan_read(atchan, AT_XDMAC_CNDA), > + at_xdmac_chan_read(atchan, AT_XDMAC_CNDC), > + at_xdmac_chan_read(atchan, AT_XDMAC_CSA), > + at_xdmac_chan_read(atchan, AT_XDMAC_CDA), > + at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); > + > +} > + > +static dma_cookie_t at_xdmac_tx_submit(struct dma_async_tx_descriptor *tx) > +{ > + struct at_xdmac_desc *desc = txd_to_at_desc(tx); > + struct at_xdmac_chan *atchan = to_at_xdmac_chan(tx->chan); > + dma_cookie_t cookie; > + unsigned long flags; > + > + spin_lock_irqsave(&atchan->lock, flags); > + cookie = dma_cookie_assign(tx); > + > + dev_vdbg(chan2dev(tx->chan), "%s: atchan 0x%p, add desc 0x%p to xfers_list\n", > + __func__, atchan, desc); > + list_add_tail(&desc->xfer_node, &atchan->xfers_list); > + if (list_is_singular(&atchan->xfers_list)) > + at_xdmac_start_xfer(atchan, desc); > + > + spin_unlock_irqrestore(&atchan->lock, flags); > + return cookie; > +} > + > +static struct at_xdmac_desc *at_xdmac_alloc_desc(struct dma_chan *chan, > + gfp_t gfp_flags) > +{ > + struct at_xdmac_desc *desc; > + struct at_xdmac *atxdmac = to_at_xdmac(chan->device); > + dma_addr_t phys; > + > + desc = dma_pool_alloc(atxdmac->at_xdmac_desc_pool, gfp_flags, &phys); > + if (desc) { > + memset(desc, 0, sizeof(*desc)); > + INIT_LIST_HEAD(&desc->descs_list); > + dma_async_tx_descriptor_init(&desc->tx_dma_desc, chan); > + desc->tx_dma_desc.tx_submit = at_xdmac_tx_submit; > + desc->tx_dma_desc.phys = phys; > + } > + > + return desc; > +} > + > +/* Call must be protected by lock. */ > +static struct at_xdmac_desc *at_xdmac_get_desc(struct at_xdmac_chan *atchan) > +{ > + struct at_xdmac_desc *desc; > + > + if (list_empty(&atchan->free_descs_list)) { > + desc = at_xdmac_alloc_desc(&atchan->chan, GFP_NOWAIT); > + } else { > + desc = list_first_entry(&atchan->free_descs_list, > + struct at_xdmac_desc, desc_node); > + list_del(&desc->desc_node); > + } > + > + return desc; > +} > + > +static struct dma_chan *at_xdmac_xlate(struct of_phandle_args *dma_spec, > + struct of_dma *of_dma) > +{ > + struct at_xdmac *atxdmac = of_dma->of_dma_data; > + struct at_xdmac_chan *atchan; > + struct dma_chan *chan; > + struct device *dev = atxdmac->dma.dev; > + dma_cap_mask_t mask; > + > + if (dma_spec->args_count != 2) { > + dev_err(dev, "dma phandler args: bad number of args\n"); > + return NULL; > + } > + > + dma_cap_zero(mask); > + dma_cap_set(DMA_SLAVE, mask); > + chan = dma_get_any_slave_channel(&atxdmac->dma); > + if (!chan) { > + dev_err(dev, "can't get a dma channel\n"); > + return NULL; > + } > + > + atchan = to_at_xdmac_chan(chan); > + atchan->memif = AT91_XDMAC_DT_GET_MEM_IF(dma_spec->args[0]); > + atchan->perif = AT91_XDMAC_DT_GET_PER_IF(dma_spec->args[0]); > + atchan->perid = AT91_XDMAC_DT_GET_PERID(dma_spec->args[1]); > + dev_info(dev, "chan dt cfg: memif=%u perif=%u perid=%u\n", > + atchan->memif, atchan->perif, atchan->perid); > + > + return chan; > +} > + > +static int at_xdmac_set_slave_config(struct dma_chan *chan, > + struct dma_slave_config *sconfig) > +{ > + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); > + > + atchan->cfg = AT91_XDMAC_DT_PERID(atchan->perid) > + | AT_XDMAC_CC_SWREQ_HWR_CONNECTED > + | AT_XDMAC_CC_MBSIZE_SIXTEEN > + | AT_XDMAC_CC_TYPE_PER_TRAN; > + > + if (sconfig->direction == DMA_DEV_TO_MEM) { > + atchan->cfg |= AT_XDMAC_CC_DAM_INCREMENTED_AM > + | AT_XDMAC_CC_SAM_FIXED_AM > + | AT_XDMAC_CC_DIF(atchan->memif) > + | AT_XDMAC_CC_SIF(atchan->perif) > + | AT_XDMAC_CC_DSYNC_PER2MEM; > + atchan->dwidth = ffs(sconfig->src_addr_width) - 1; > + atchan->cfg |= AT_XDMAC_CC_DWIDTH(atchan->dwidth); > + atchan->cfg |= at_xdmac_csize(sconfig->src_maxburst); > + } else if (sconfig->direction == DMA_MEM_TO_DEV) { > + atchan->cfg |= AT_XDMAC_CC_DAM_FIXED_AM > + | AT_XDMAC_CC_SAM_INCREMENTED_AM > + | AT_XDMAC_CC_DIF(atchan->perif) > + | AT_XDMAC_CC_SIF(atchan->memif) > + | AT_XDMAC_CC_DSYNC_MEM2PER; > + atchan->dwidth = ffs(sconfig->dst_addr_width) - 1; > + atchan->cfg |= AT_XDMAC_CC_DWIDTH(atchan->dwidth); > + atchan->cfg |= at_xdmac_csize(sconfig->dst_maxburst); > + } else Style: {} missing. > + return -EINVAL; > + > + /* > + * Src address and dest addr are needed to configure the link list > + * descriptor so keep the slave configuration. > + */ > + memcpy(&atchan->dma_sconfig, sconfig, sizeof(struct dma_slave_config)); > + > + dev_dbg(chan2dev(chan), "%s: atchan->cfg=0x%08x\n", __func__, atchan->cfg); > + > + return 0; > +} > + > +static struct dma_async_tx_descriptor * > +at_xdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, > + unsigned int sg_len, enum dma_transfer_direction direction, > + unsigned long flags, void *context) > +{ > + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); > + struct dma_slave_config *sconfig = &atchan->dma_sconfig; > + struct at_xdmac_desc *first = NULL, *prev = NULL; > + struct scatterlist *sg; > + int i; > + > + if (!sgl) > + return NULL; > + > + if (!is_slave_direction(direction)) { > + dev_err(chan2dev(chan), "invalid DMA direction\n"); > + return NULL; > + } > + > + dev_dbg(chan2dev(chan), "%s: sg_len=%d, dir=%s, flags=0x%lx\n", > + __func__, sg_len, > + direction == DMA_MEM_TO_DEV ? "to device" : "from device", > + flags); > + > + /* Protect dma_sconfig field that can be modified by set_slave_conf. */ > + spin_lock(&atchan->lock); > + > + /* Prepare descriptors. */ > + for_each_sg(sgl, sg, sg_len, i) { > + struct at_xdmac_desc *desc = NULL; > + u32 len, mem; > + > + len = sg_dma_len(sg); > + mem = sg_dma_address(sg); > + if (unlikely(!len)) { > + dev_err(chan2dev(chan), "sg data length is zero\n"); > + spin_unlock(&atchan->lock); > + return NULL; > + } > + dev_dbg(chan2dev(chan), "%s: * sg%d len=%u, mem=0x%08x\n", > + __func__, i, len, mem); > + > + desc = at_xdmac_get_desc(atchan); > + if (!desc) { > + dev_err(chan2dev(chan), "can't get descriptor\n"); > + if (first) > + list_splice_init(&first->descs_list, &atchan->free_descs_list); > + spin_unlock(&atchan->lock); > + return NULL; > + } > + > + /* Linked list descriptor setup. */ > + if (direction == DMA_DEV_TO_MEM) { > + desc->lld.mbr_sa = sconfig->src_addr; > + desc->lld.mbr_da = mem; > + } else { > + desc->lld.mbr_sa = mem; > + desc->lld.mbr_da = sconfig->dst_addr; > + } > + desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV1 /* next descriptor view */ > + | AT_XDMAC_MBR_UBC_NDEN /* next descriptor dst parameter update */ > + | AT_XDMAC_MBR_UBC_NSEN /* next descriptor src parameter update */ > + | (i == sg_len - 1 ? 0 : AT_XDMAC_MBR_UBC_NDE) /* descriptor fetch */ > + | len / (1 << atchan->dwidth); /* microblock length */ > + dev_dbg(chan2dev(chan), > + "%s: lld: mbr_sa=0x%08x, mbr_da=0x%08x, mbr_ubc=0x%08x\n", > + __func__, desc->lld.mbr_sa, desc->lld.mbr_da, desc->lld.mbr_ubc); > + > + /* Chain lld. */ > + if (prev) { > + prev->lld.mbr_nda = desc->tx_dma_desc.phys; > + dev_dbg(chan2dev(chan), > + "%s: chain lld: prev=0x%p, mbr_nda=0x%08x\n", > + __func__, prev, prev->lld.mbr_nda); > + } > + > + prev = desc; > + if (!first) > + first = desc; > + > + dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n", > + __func__, desc, first); > + list_add_tail(&desc->desc_node, &first->descs_list); > + } > + > + spin_unlock(&atchan->lock); > + > + first->tx_dma_desc.cookie = -EBUSY; > + first->tx_dma_desc.flags = flags; > + first->xfer_size = sg_len; > + > + return &first->tx_dma_desc; > +} > + > +static struct dma_async_tx_descriptor * > +at_xdmac_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, > + size_t buf_len, size_t period_len, > + enum dma_transfer_direction direction, > + unsigned long flags) > +{ > + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); > + struct dma_slave_config *sconfig = &atchan->dma_sconfig; > + struct at_xdmac_desc *first = NULL, *prev = NULL; > + unsigned int periods = buf_len / period_len; > + unsigned long lock_flags; > + int i; > + > + dev_dbg(chan2dev(chan), "%s: buf_addr=0x%08x, buf_len=%d, period_len=%d, " > + "dir=%s, flags=0x%lx\n", > + __func__, buf_addr, buf_len, period_len, > + direction == DMA_MEM_TO_DEV ? "mem2per" : "per2mem", flags); > + > + if (!is_slave_direction(direction)) { > + dev_err(chan2dev(chan), "invalid DMA direction\n"); > + return NULL; > + } > + > + if (test_and_set_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status)) { > + dev_err(chan2dev(chan), "channel currently used\n"); > + return NULL; > + } > + > + for (i = 0; i < periods; i++) { > + struct at_xdmac_desc *desc = NULL; > + > + spin_lock_irqsave(&atchan->lock, lock_flags); > + desc = at_xdmac_get_desc(atchan); > + spin_unlock_irqrestore(&atchan->lock, lock_flags); > + if (!desc) { > + dev_err(chan2dev(chan), "can't get descriptor\n"); > + if (first) > + list_splice_init(&first->descs_list, &atchan->free_descs_list); > + return NULL; > + } > + dev_dbg(chan2dev(chan), > + "%s: desc=0x%p, tx_dma_desc.phys=0x%08x\n", > + __func__, desc, desc->tx_dma_desc.phys); > + > + if (direction == DMA_DEV_TO_MEM) { > + desc->lld.mbr_sa = sconfig->src_addr; > + desc->lld.mbr_da = buf_addr + i * period_len; > + } else { > + desc->lld.mbr_sa = buf_addr + i * period_len; > + desc->lld.mbr_da = sconfig->dst_addr; > + }; > + desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV1 > + | AT_XDMAC_MBR_UBC_NDEN > + | AT_XDMAC_MBR_UBC_NSEN > + | AT_XDMAC_MBR_UBC_NDE > + | period_len / (1 << atchan->dwidth); > + > + dev_dbg(chan2dev(chan), > + "%s: lld: mbr_sa=0x%08x, mbr_da=0x%08x, mbr_ubc=0x%08x\n", > + __func__, desc->lld.mbr_sa, desc->lld.mbr_da, desc->lld.mbr_ubc); > + > + /* Chain lld. */ > + if (prev) { > + prev->lld.mbr_nda = desc->tx_dma_desc.phys; > + dev_dbg(chan2dev(chan), > + "%s: chain lld: prev=0x%p, mbr_nda=0x%08x\n", > + __func__, prev, prev->lld.mbr_nda); > + } > + > + prev = desc; > + if (!first) > + first = desc; > + > + dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n", > + __func__, desc, first); > + list_add_tail(&desc->desc_node, &first->descs_list); > + } > + > + prev->lld.mbr_nda = first->tx_dma_desc.phys; > + dev_dbg(chan2dev(chan), > + "%s: chain lld: prev=0x%p, mbr_nda=0x%08x\n", > + __func__, prev, prev->lld.mbr_nda); > + first->tx_dma_desc.cookie = -EBUSY; > + first->tx_dma_desc.flags = flags; > + first->xfer_size = buf_len; > + > + return &first->tx_dma_desc; > +} > + > +static struct dma_async_tx_descriptor * > +at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, > + size_t len, unsigned long flags) > +{ > + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); > + struct at_xdmac_desc *first = NULL, *prev = NULL; > + size_t remaining_size = len, xfer_size = 0, ublen; > + dma_addr_t src_addr = src, dst_addr = dest; > + u32 dwidth; > + /* > + * WARNING: The channel configuration is set here since there is no > + * dmaengine_slave_config call in this case. Moreover we don't know the > + * direction, it involves we can't dynamically set the source and dest > + * interface so we have to use the same one. Only interface 0 allows EBI > + * access. Hopefully we can access DDR through both ports (at least on > + * SAMA5D4x), so we can use the same interface for source and dest, > + * that solves the fact we don't know the direction. > + */ > + u32 chan_cc = AT_XDMAC_CC_DAM_INCREMENTED_AM > + | AT_XDMAC_CC_SAM_INCREMENTED_AM > + | AT_XDMAC_CC_DIF(0) > + | AT_XDMAC_CC_SIF(0) > + | AT_XDMAC_CC_MBSIZE_SIXTEEN > + | AT_XDMAC_CC_TYPE_MEM_TRAN; > + > + dev_dbg(chan2dev(chan), "%s: src=0x%08x, dest=0x%08x, len=%d, flags=0x%lx\n", > + __func__, src, dest, len, flags); > + > + if (unlikely(!len)) > + return NULL; > + > + /* Check address alignment to select the greater data width we can use. Style: "/*" alone on the line ;-) > + * Some XDMAC implementations don't provide dword transfer, in this > + * case selecting dword has the same behavior as selecting word transfers. > + */ > + if (!((src_addr | dst_addr) & 7)) { > + dwidth = AT_XDMAC_CC_DWIDTH_DWORD; > + dev_dbg(chan2dev(chan), "%s: dwidth: double word\n", __func__); > + } else if (!((src_addr | dst_addr) & 3)) { > + dwidth = AT_XDMAC_CC_DWIDTH_WORD; > + dev_dbg(chan2dev(chan), "%s: dwidth: word\n", __func__); > + } else if (!((src_addr | dst_addr) & 1)) { > + dwidth = AT_XDMAC_CC_DWIDTH_HALFWORD; > + dev_dbg(chan2dev(chan), "%s: dwidth: half word\n", __func__); > + } else { > + dwidth = AT_XDMAC_CC_DWIDTH_BYTE; > + dev_dbg(chan2dev(chan), "%s: dwidth: byte\n", __func__); > + } > + > + atchan->cfg = chan_cc | AT_XDMAC_CC_DWIDTH(dwidth); > + > + /* Prepare descriptors. */ > + while (remaining_size) { > + struct at_xdmac_desc *desc = NULL; > + > + dev_dbg(chan2dev(chan), "%s: remaining_size=%u\n", __func__, remaining_size); > + > + spin_lock_irqsave(&atchan->lock, flags); > + desc = at_xdmac_get_desc(atchan); > + spin_unlock_irqrestore(&atchan->lock, flags); > + if (!desc) { > + dev_err(chan2dev(chan), "can't get descriptor\n"); > + if (first) > + list_splice_init(&first->descs_list, &atchan->free_descs_list); > + return NULL; > + } > + > + /* Update src and dest addresses. */ > + src_addr += xfer_size; > + dst_addr += xfer_size; > + > + if (remaining_size >= AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth) > + xfer_size = AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth; > + else > + xfer_size = remaining_size; > + > + dev_dbg(chan2dev(chan), "%s: xfer_size=%u\n", __func__, xfer_size); > + > + /* Check remaining length and change data width if needed. */ > + if (!((src_addr | dst_addr | xfer_size) & 7)) { > + dwidth = AT_XDMAC_CC_DWIDTH_DWORD; > + dev_dbg(chan2dev(chan), "%s: dwidth: double word\n", __func__); > + } else if (!((src_addr | dst_addr | xfer_size) & 3)) { > + dwidth = AT_XDMAC_CC_DWIDTH_WORD; > + dev_dbg(chan2dev(chan), "%s: dwidth: word\n", __func__); > + } else if (!((src_addr | dst_addr | xfer_size) & 1)) { > + dwidth = AT_XDMAC_CC_DWIDTH_HALFWORD; > + dev_dbg(chan2dev(chan), "%s: dwidth: half word\n", __func__); > + } else if ((src_addr | dst_addr | xfer_size) & 1) { > + dwidth = AT_XDMAC_CC_DWIDTH_BYTE; > + dev_dbg(chan2dev(chan), "%s: dwidth: byte\n", __func__); > + } > + chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth); > + > + ublen = xfer_size >> dwidth; > + remaining_size -= xfer_size; > + > + desc->lld.mbr_sa = src_addr; > + desc->lld.mbr_da = dst_addr; > + desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV2 > + | AT_XDMAC_MBR_UBC_NDEN > + | AT_XDMAC_MBR_UBC_NSEN > + | (remaining_size ? 0 : AT_XDMAC_MBR_UBC_NDE) > + | ublen; > + desc->lld.mbr_cfg = chan_cc; > + > + dev_dbg(chan2dev(chan), > + "%s: lld: mbr_sa=0x%08x, mbr_da=0x%08x, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n", > + __func__, desc->lld.mbr_sa, desc->lld.mbr_da, desc->lld.mbr_ubc, desc->lld.mbr_cfg); > + > + /* Chain lld. */ > + if (prev) { > + prev->lld.mbr_nda = desc->tx_dma_desc.phys; > + dev_dbg(chan2dev(chan), > + "%s: chain lld: prev=0x%p, mbr_nda=0x%08x\n", > + __func__, prev, prev->lld.mbr_nda); > + } > + > + prev = desc; > + if (!first) > + first = desc; > + > + dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n", > + __func__, desc, first); > + list_add_tail(&desc->desc_node, &first->descs_list); > + } > + > + first->tx_dma_desc.cookie = -EBUSY; > + first->tx_dma_desc.flags = flags; > + first->xfer_size = len; > + > + return &first->tx_dma_desc; > +} > + > +static enum dma_status > +at_xdmac_tx_status(struct dma_chan *chan, dma_cookie_t cookie, > + struct dma_tx_state *txstate) > +{ > + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); > + struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); > + struct at_xdmac_desc *desc, *_desc; > + unsigned long flags; > + enum dma_status ret; > + int residue; > + u32 cur_nda; > + > + ret = dma_cookie_status(chan, cookie, txstate); > + if (ret == DMA_COMPLETE) > + return ret; > + > + if (!txstate) > + return ret; > + > + spin_lock_irqsave(&atchan->lock, flags); > + > + desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node); > + > + /* > + * If the transfer has not been started yet, don't need to compute the > + * residue, it's the transfer length. > + */ > + if (!desc->active_xfer) { > + dma_set_residue(txstate, desc->xfer_size); > + return ret; > + } > + > + residue = desc->xfer_size; > + /* Flush FIFO. */ > + at_xdmac_write(atxdmac, AT_XDMAC_GSWF, atchan->mask); > + while (!(at_xdmac_chan_read(atchan, AT_XDMAC_CIS) & AT_XDMAC_CIS_FIS)); > + cpu_relax(); > + > + cur_nda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA) & 0xfffffffc; > + /* > + * Remove size of all microblocks already transferred and the current > + * one. Then add the remaining size to transfer of the current > + * microblock. > + */ > + list_for_each_entry_safe(desc, _desc, &desc->descs_list, desc_node) { > + residue -= (desc->lld.mbr_ubc & 0xffffff) << atchan->dwidth; > + if ((desc->lld.mbr_nda & 0xfffffffc) == cur_nda) > + break; > + } > + residue += at_xdmac_chan_read(atchan, AT_XDMAC_CUBC) << atchan->dwidth; > + > + spin_unlock_irqrestore(&atchan->lock, flags); > + > + dma_set_residue(txstate, residue); > + > + dev_dbg(chan2dev(chan), > + "%s: desc=0x%p, tx_dma_desc.phys=0x%08x, tx_status=%d, cookie=%d, residue=%d\n", > + __func__, desc, desc->tx_dma_desc.phys, ret, cookie, residue); > + > + return ret; > +} > + > +static void at_xdmac_remove_xfer(struct at_xdmac_chan *atchan, > + struct at_xdmac_desc *desc) > +{ > + dev_dbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc); > + > + /* > + * Remove the transfer from the transfer list then move the transfer > + * descriptors into the free descriptors list. > + */ > + list_del(&desc->xfer_node); > + list_splice_init(&desc->descs_list, &atchan->free_descs_list); > +} > + > +static void at_xdmac_advance_work(struct at_xdmac_chan *atchan) > +{ > + struct at_xdmac_desc *desc; > + unsigned long flags; > + > + spin_lock_irqsave(&atchan->lock, flags); > + > + /* > + * If channel is enabled, do nothing, advance_work will be triggered > + * after the interruption. > + */ > + if (!at_xdmac_chan_is_enabled(atchan) && !list_empty(&atchan->xfers_list)) { > + desc = list_first_entry(&atchan->xfers_list, > + struct at_xdmac_desc, > + xfer_node); > + dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc); > + if (!desc->active_xfer) > + at_xdmac_start_xfer(atchan, desc); > + } > + > + spin_unlock_irqrestore(&atchan->lock, flags); > +} > + > +static void at_xdmac_handle_cyclic(struct at_xdmac_chan *atchan) > +{ > + struct at_xdmac_desc *desc; > + struct dma_async_tx_descriptor *txd; > + > + desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node); > + txd = &desc->tx_dma_desc; > + > + if (txd->callback && (txd->flags & DMA_PREP_INTERRUPT)) > + txd->callback(txd->callback_param); > +} > + > +static void at_xdmac_tasklet(unsigned long data) > +{ > + struct at_xdmac_chan *atchan = (struct at_xdmac_chan *)data; > + struct at_xdmac_desc *desc; > + u32 error_mask; > + > + dev_dbg(chan2dev(&atchan->chan), "%s: status=0x%08lx\n", > + __func__, atchan->status); > + > + error_mask = AT_XDMAC_CIS_RBEIS > + | AT_XDMAC_CIS_WBEIS > + | AT_XDMAC_CIS_ROIS; > + > + if (at_xdmac_chan_is_cyclic(atchan)) { > + at_xdmac_handle_cyclic(atchan); > + } else if ((atchan->status & AT_XDMAC_CIS_LIS) > + || (atchan->status & error_mask)) { > + struct dma_async_tx_descriptor *txd; > + > + if (atchan->status & AT_XDMAC_CIS_RBEIS) > + dev_err(chan2dev(&atchan->chan), "read bus error!!!"); > + else if (atchan->status & AT_XDMAC_CIS_WBEIS) > + dev_err(chan2dev(&atchan->chan), "write bus error!!!"); > + else if (atchan->status & AT_XDMAC_CIS_ROIS) > + dev_err(chan2dev(&atchan->chan), "request overflow error!!!"); > + > + desc = list_first_entry(&atchan->xfers_list, > + struct at_xdmac_desc, > + xfer_node); > + dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc); > + BUG_ON(!desc->active_xfer); > + > + txd = &desc->tx_dma_desc; > + > + at_xdmac_remove_xfer(atchan, desc); > + > + if (!at_xdmac_chan_is_cyclic(atchan)) { > + dma_cookie_complete(txd); > + if (txd->callback && (txd->flags & DMA_PREP_INTERRUPT)) > + txd->callback(txd->callback_param); > + } > + > + dma_run_dependencies(txd); > + > + at_xdmac_advance_work(atchan); > + } > +} > + > +static irqreturn_t at_xdmac_interrupt(int irq, void *dev_id) > +{ > + struct at_xdmac *atxdmac = (struct at_xdmac *)dev_id; > + struct at_xdmac_chan *atchan; > + u32 imr, status, pending; > + u32 chan_imr, chan_status; > + int i, ret = IRQ_NONE; > + > + do { > + imr = at_xdmac_read(atxdmac, AT_XDMAC_GIM); > + status = at_xdmac_read(atxdmac, AT_XDMAC_GIS); > + pending = status & imr; > + > + dev_vdbg(atxdmac->dma.dev, > + "%s: status=0x%08x, imr=0x%08x, pending=0x%08x\n", > + __func__, status, imr, pending); > + > + if (!pending) > + break; > + > + /* We have to find which channel has generated the interrupt. */ > + for (i = 0; i < atxdmac->dma.chancnt; i++) { > + if (!((1 << i) & pending)) > + continue; > + > + atchan = &atxdmac->chan[i]; > + chan_imr = at_xdmac_chan_read(atchan, AT_XDMAC_CIM); > + chan_status = at_xdmac_chan_read(atchan, AT_XDMAC_CIS); > + atchan->status = chan_status & chan_imr; > + dev_vdbg(atxdmac->dma.dev, > + "%s: chan%d: imr=0x%x, status=0x%x\n", > + __func__, i, chan_imr, chan_status); > + dev_vdbg(chan2dev(&atchan->chan), > + "%s: XDMAC_CC=0x%08x XDMAC_CNDA=0x%08x, " > + "XDMAC_CNDC=0x%08x, XDMAC_CSA=0x%08x, " > + "XDMAC_CDA=0x%08x, XDMAC_CUBC=0x%08x\n", > + __func__, > + at_xdmac_chan_read(atchan, AT_XDMAC_CC), > + at_xdmac_chan_read(atchan, AT_XDMAC_CNDA), > + at_xdmac_chan_read(atchan, AT_XDMAC_CNDC), > + at_xdmac_chan_read(atchan, AT_XDMAC_CSA), > + at_xdmac_chan_read(atchan, AT_XDMAC_CDA), > + at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); > + > + if (atchan->status & (AT_XDMAC_CIS_RBEIS | AT_XDMAC_CIS_WBEIS)) > + at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask); > + > + tasklet_schedule(&atchan->tasklet); > + ret = IRQ_HANDLED; > + } > + > + } while (pending); > + > + return ret; > +} > + > +static void at_xdmac_issue_pending(struct dma_chan *chan) > +{ > + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); > + > + dev_dbg(chan2dev(&atchan->chan), "%s\n", __func__); > + > + if (!at_xdmac_chan_is_cyclic(atchan)) > + at_xdmac_advance_work(atchan); > + > + return; > +} > + > +static int at_xdmac_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, > + unsigned long arg) > +{ > + struct at_xdmac_desc *desc, *_desc; > + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); > + struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); > + unsigned long flags; > + int ret = 0; > + > + dev_dbg(chan2dev(chan), "%s: cmd=%d\n", __func__, cmd); > + > + spin_lock_irqsave(&atchan->lock, flags); > + > + switch (cmd) { > + case DMA_PAUSE: > + at_xdmac_write(atxdmac, AT_XDMAC_GRWS, atchan->mask); > + set_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status); > + break; > + > + case DMA_RESUME: > + if (!at_xdmac_chan_is_paused(atchan)) > + break; > + > + at_xdmac_write(atxdmac, AT_XDMAC_GRWR, atchan->mask); > + clear_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status); > + break; > + > + case DMA_TERMINATE_ALL: > + at_xdmac_write(atxdmac, AT_XDMAC_GIE, atchan->mask); This is not needed, is it? > + at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask); > + while (at_xdmac_read(atxdmac, AT_XDMAC_GS) & atchan->mask) > + cpu_relax(); > + > + /* Cancel all pending transfers. */ > + list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node) > + at_xdmac_remove_xfer(atchan, desc); > + > + clear_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status); > + break; > + > + case DMA_SLAVE_CONFIG: > + ret = at_xdmac_set_slave_config(chan, > + (struct dma_slave_config *)arg); > + break; > + > + default: > + dev_err(chan2dev(chan), > + "unmanaged or unknown dma control cmd: %d\n", cmd); > + ret = -ENXIO; > + } > + > + spin_unlock_irqrestore(&atchan->lock, flags); > + > + return ret; > +} > + > +static int at_xdmac_alloc_chan_resources(struct dma_chan *chan) > +{ > + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); > + struct at_xdmac_desc *desc; > + unsigned long flags; > + int i; > + > + spin_lock_irqsave(&atchan->lock, flags); > + > + if (at_xdmac_chan_is_enabled(atchan)) { > + dev_err(chan2dev(chan), > + "can't allocate channel resources (channel enabled)\n"); > + i = -EIO; > + goto spin_unlock; > + } > + > + if (!list_empty(&atchan->free_descs_list)) { > + dev_err(chan2dev(chan), > + "can't allocate channel resources (channel not free from a previous use)\n"); > + i = -EIO; > + goto spin_unlock; > + } > + > + for (i = 0; i < init_nr_desc_per_channel; i++) { > + desc = at_xdmac_alloc_desc(chan, GFP_ATOMIC); > + if (!desc) { > + dev_warn(chan2dev(chan), > + "only %d descriptors have been allocated\n", i); > + break; > + } > + list_add_tail(&desc->desc_node, &atchan->free_descs_list); > + } > + > + dma_cookie_init(chan); > + > + dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i); > + > +spin_unlock: > + spin_unlock_irqrestore(&atchan->lock, flags); > + return i; > +} > + > +static void at_xdmac_free_chan_resources(struct dma_chan *chan) > +{ > + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); > + struct at_xdmac *atxdmac = to_at_xdmac(chan->device); > + struct at_xdmac_desc *desc, *_desc; > + > + list_for_each_entry_safe(desc, _desc, &atchan->free_descs_list, desc_node) { > + dev_dbg(chan2dev(chan), "%s: freeing descriptor %p\n", __func__, desc); > + list_del(&desc->desc_node); > + dma_pool_free(atxdmac->at_xdmac_desc_pool, desc, desc->tx_dma_desc.phys); > + } > + > + return; > +} > + > +#define AT_XDMAC_DMA_BUSWIDTHS\ > + (BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \ > + BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ > + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ > + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \ > + BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)) > + > +static int at_xdmac_device_slave_caps(struct dma_chan *dchan, > + struct dma_slave_caps *caps) > +{ > + > + caps->src_addr_widths = AT_XDMAC_DMA_BUSWIDTHS; > + caps->dstn_addr_widths = AT_XDMAC_DMA_BUSWIDTHS; > + caps->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); > + caps->cmd_pause = true; > + caps->cmd_terminate = true; > + caps->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; > + > + return 0; > +} > + > +#ifdef CONFIG_PM_SLEEP > +static int atmel_xdmac_prepare(struct device *dev) For this funtion, maybe CONFIG_PM is the directive that you should use. > +{ > + struct platform_device *pdev = to_platform_device(dev); > + struct at_xdmac *atxdmac = platform_get_drvdata(pdev); > + struct dma_chan *chan, *_chan; > + > + list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { > + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); > + > + /* Wait for transfer completion, except in cyclic case. */ > + if (at_xdmac_chan_is_enabled(atchan) && !at_xdmac_chan_is_cyclic(atchan)) > + return -EAGAIN; > + } > + return 0; > +} > + > +static int atmel_xdmac_suspend(struct device *dev) > +{ > + struct platform_device *pdev = to_platform_device(dev); > + struct at_xdmac *atxdmac = platform_get_drvdata(pdev); > + struct dma_chan *chan, *_chan; > + > + list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { > + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); > + > + if (at_xdmac_chan_is_cyclic(atchan)) { > + if (!at_xdmac_chan_is_paused(atchan)) > + at_xdmac_control(chan, DMA_PAUSE, 0); > + atchan->save_cim = at_xdmac_chan_read(atchan, AT_XDMAC_CIM); > + atchan->save_cnda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA); > + atchan->save_cndc = at_xdmac_chan_read(atchan, AT_XDMAC_CNDC); > + } > + } > + atxdmac->save_gim = at_xdmac_read(atxdmac, AT_XDMAC_GIM); > + > + at_xdmac_off(atxdmac); > + clk_disable_unprepare(atxdmac->clk); > + return 0; > +} > + > +static int atmel_xdmac_resume(struct device *dev) > +{ > + struct platform_device *pdev = to_platform_device(dev); > + struct at_xdmac *atxdmac = platform_get_drvdata(pdev); > + struct at_xdmac_chan *atchan; > + struct dma_chan *chan, *_chan; > + int i; > + > + clk_prepare_enable(atxdmac->clk); > + > + /* Clear pending interrupts. */ > + for (i = 0; i < atxdmac->dma.chancnt; i++) { > + atchan = &atxdmac->chan[i]; > + while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS)) > + cpu_relax(); > + } > + > + at_xdmac_write(atxdmac, AT_XDMAC_GIE, atxdmac->save_gim); > + at_xdmac_write(atxdmac, AT_XDMAC_GE, atxdmac->save_gs); > + list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { > + atchan = to_at_xdmac_chan(chan); > + at_xdmac_chan_write(atchan, AT_XDMAC_CC, atchan->cfg); > + if (at_xdmac_chan_is_cyclic(atchan)) { > + at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, atchan->save_cnda); > + at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, atchan->save_cndc); > + at_xdmac_chan_write(atchan, AT_XDMAC_CIE, atchan->save_cim); As realized together, a write memory barried seems needed here. > + at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask); > + } > + } > + return 0; > +} > +#else > +# define atmel_xdmac_prepare NULL > +#endif /* CONFIG_PM_SLEEP */ > + > +static int at_xdmac_probe(struct platform_device *pdev) > +{ > + struct resource *res; > + struct at_xdmac *atxdmac; > + int irq, size, nr_channels, i, ret; > + void __iomem *base; > + u32 reg; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + if (!res) > + return -EINVAL; > + > + irq = platform_get_irq(pdev, 0); > + if (irq < 0) > + return irq; > + > + base = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(base)) > + return PTR_ERR(base); > + > + /* > + * Read number of xdmac channels, read helper function can't be used > + * since atxdmac is not yet allocated and we need to know the number > + * of channels to do the allocation. > + */ > + reg = readl_relaxed(base + AT_XDMAC_GTYPE); > + nr_channels = AT_XDMAC_NB_CH(reg); > + if (nr_channels > AT_XDMAC_MAX_CHAN) { > + dev_err(&pdev->dev, "invalid number of channels (%u)\n", > + nr_channels); > + return -EINVAL; > + } > + > + size = sizeof(*atxdmac); > + size += nr_channels * sizeof(struct at_xdmac_chan); > + atxdmac = devm_kzalloc(&pdev->dev, size, GFP_KERNEL); > + if (!atxdmac) { > + dev_err(&pdev->dev, "can't allocate at_xdmac structure\n"); > + return -ENOMEM; > + } > + > + atxdmac->regs = base; > + atxdmac->irq = irq; > + > + atxdmac->clk = devm_clk_get(&pdev->dev, "dma_clk"); > + if (IS_ERR(atxdmac->clk)) { > + dev_err(&pdev->dev, "can't get dma_clk\n"); > + return PTR_ERR(atxdmac->clk); > + } > + > + /* Do not use dev res to prevent races with tasklet */ > + ret = request_irq(atxdmac->irq, at_xdmac_interrupt, 0, "at_xdmac", atxdmac); > + if (ret) { > + dev_err(&pdev->dev, "can't request irq\n"); > + return ret; > + } > + > + ret = clk_prepare_enable(atxdmac->clk); > + if (ret) { > + dev_err(&pdev->dev, "can't prepare or enable clock\n"); > + goto err_free_irq; > + } > + > + atxdmac->at_xdmac_desc_pool = > + dmam_pool_create(dev_name(&pdev->dev), &pdev->dev, > + sizeof(struct at_xdmac_desc), 4, 0); > + if (!atxdmac->at_xdmac_desc_pool) { > + dev_err(&pdev->dev, "no memory for descriptors dma pool\n"); > + ret = -ENOMEM; > + goto err_clk_disable; > + } > + > + dma_cap_set(DMA_CYCLIC, atxdmac->dma.cap_mask); > + dma_cap_set(DMA_MEMCPY, atxdmac->dma.cap_mask); > + dma_cap_set(DMA_SLAVE, atxdmac->dma.cap_mask); > + atxdmac->dma.dev = &pdev->dev; > + atxdmac->dma.device_alloc_chan_resources = at_xdmac_alloc_chan_resources; > + atxdmac->dma.device_free_chan_resources = at_xdmac_free_chan_resources; > + atxdmac->dma.device_tx_status = at_xdmac_tx_status; > + atxdmac->dma.device_issue_pending = at_xdmac_issue_pending; > + atxdmac->dma.device_prep_dma_cyclic = at_xdmac_prep_dma_cyclic; > + atxdmac->dma.device_prep_dma_memcpy = at_xdmac_prep_dma_memcpy; > + atxdmac->dma.device_prep_slave_sg = at_xdmac_prep_slave_sg; > + atxdmac->dma.device_control = at_xdmac_control; > + atxdmac->dma.chancnt = nr_channels; > + atxdmac->dma.device_slave_caps = at_xdmac_device_slave_caps; > + > + /* Disable all chans and interrupts. */ > + at_xdmac_off(atxdmac); > + > + /* Init channels. */ > + INIT_LIST_HEAD(&atxdmac->dma.channels); > + for (i = 0; i < nr_channels; i++) { > + struct at_xdmac_chan *atchan = &atxdmac->chan[i]; > + > + atchan->chan.device = &atxdmac->dma; > + list_add_tail(&atchan->chan.device_node, > + &atxdmac->dma.channels); > + > + atchan->ch_regs = at_xdmac_chan_reg_base(atxdmac, i); > + atchan->mask = 1 << i; > + > + spin_lock_init(&atchan->lock); > + INIT_LIST_HEAD(&atchan->xfers_list); > + INIT_LIST_HEAD(&atchan->free_descs_list); > + tasklet_init(&atchan->tasklet, at_xdmac_tasklet, > + (unsigned long)atchan); > + > + /* Clear pending interrupts. */ > + while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS)) > + cpu_relax(); > + } > + platform_set_drvdata(pdev, atxdmac); > + > + ret = dma_async_device_register(&atxdmac->dma); > + if (ret) { > + dev_err(&pdev->dev, "fail to register DMA engine device\n"); > + goto err_clk_disable; > + } > + > + ret = of_dma_controller_register(pdev->dev.of_node, > + at_xdmac_xlate, atxdmac); > + if (ret) { > + dev_err(&pdev->dev, "could not register of dma controller\n"); > + goto err_dma_unregister; > + } > + > + dev_info(&pdev->dev, "%d channels, mapped at 0x%p\n", > + nr_channels, atxdmac->regs); > + > + return 0; > + > +err_dma_unregister: > + dma_async_device_unregister(&atxdmac->dma); > +err_clk_disable: > + clk_disable_unprepare(atxdmac->clk); > +err_free_irq: > + free_irq(atxdmac->irq, atxdmac->dma.dev); > + return ret; > +} > + > +static int at_xdmac_remove(struct platform_device *pdev) > +{ > + struct at_xdmac *atxdmac = (struct at_xdmac *)platform_get_drvdata(pdev); > + int i; > + > + at_xdmac_off(atxdmac); > + of_dma_controller_free(pdev->dev.of_node); > + dma_async_device_unregister(&atxdmac->dma); > + clk_disable_unprepare(atxdmac->clk); > + > + synchronize_irq(atxdmac->irq); > + > + free_irq(atxdmac->irq, atxdmac->dma.dev); > + > + for (i = 0; i < atxdmac->dma.chancnt; i++) { > + struct at_xdmac_chan *atchan = &atxdmac->chan[i]; > + > + tasklet_kill(&atchan->tasklet); > + at_xdmac_free_chan_resources(&atchan->chan); > + } > + > + return 0; > +} > + > +static const struct dev_pm_ops atmel_xdmac_dev_pm_ops = { > + .prepare = atmel_xdmac_prepare, > + SET_LATE_SYSTEM_SLEEP_PM_OPS(atmel_xdmac_suspend, atmel_xdmac_resume) > +}; > + > +static const struct of_device_id atmel_xdmac_dt_ids[] = { > + { > + .compatible = "atmel,sama5d4-dma", > + }, { > + /* sentinel */ > + } > +}; > +MODULE_DEVICE_TABLE(of, atmel_xdmac_dt_ids); > + > +static struct platform_driver at_xdmac_driver = { > + .probe = at_xdmac_probe, > + .remove = at_xdmac_remove, > + .driver = { > + .name = "at_xdmac", > + .owner = THIS_MODULE, > + .of_match_table = of_match_ptr(atmel_xdmac_dt_ids), > + .pm = &atmel_xdmac_dev_pm_ops, > + } > +}; > + > +static int __init at_xdmac_init(void) > +{ > + return platform_driver_probe(&at_xdmac_driver, at_xdmac_probe); > +} > +subsys_initcall(at_xdmac_init); > + > +MODULE_DESCRIPTION("Atmel Extended DMA Controller driver"); > +MODULE_AUTHOR("Ludovic Desroches <ludovic.desroches@xxxxxxxxx>"); > +MODULE_LICENSE("GPL"); > diff --git a/drivers/dma/at_xdmac.h b/drivers/dma/at_xdmac.h > new file mode 100644 > index 0000000..5f4d898 > --- /dev/null > +++ b/drivers/dma/at_xdmac.h > @@ -0,0 +1,307 @@ > +/* > + * Copyright (C) 2014 Atmel Corporation > + * > + * Author: Ludovic Desroches <ludovic.desroches@xxxxxxxxx> > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License version 2 as published by > + * the Free Software Foundation. > + * > + * This program is distributed in the hope that it will be useful, but WITHOUT > + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or > + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for > + * more details. > + * > + * You should have received a copy of the GNU General Public License along with > + * this program. If not, see <http://www.gnu.org/licenses/>. > + */ > + > +#ifndef __AT_XDMAC_H__ > +#define __AT_XDMAC_H__ > + > +#include <linux/clk.h> > +#include <linux/dmaengine.h> > +#include <linux/dmapool.h> > +#include <linux/interrupt.h> > +#include <linux/irq.h> > +#include <linux/list.h> > +#include <linux/module.h> > +#include <linux/of_dma.h> > +#include <linux/platform_device.h> > + > +#include "dmaengine.h" > + > +/* Global registers */ > +#define AT_XDMAC_GTYPE 0x00 /* Global Type Register */ > +#define AT_XDMAC_NB_CH(i) (((i) & 0x1F) + 1) /* Number of Channels Minus One */ > +#define AT_XDMAC_FIFO_SZ(i) (((i) >> 5) & 0x7FF) /* Number of Bytes */ > +#define AT_XDMAC_NB_REQ(i) ((((i) >> 16) & 0x3F) + 1) /* Number of Peripheral Requests Minus One */ > +#define AT_XDMAC_GCFG 0x04 /* Global Configuration Register */ > +#define AT_XDMAC_GWAC 0x08 /* Global Weighted Arbiter Configuration Register */ > +#define AT_XDMAC_GIE 0x0C /* Global Interrupt Enable Register */ > +#define AT_XDMAC_GID 0x10 /* Global Interrupt Disable Register */ > +#define AT_XDMAC_GIM 0x14 /* Global Interrupt Mask Register */ > +#define AT_XDMAC_GIS 0x18 /* Global Interrupt Status Register */ > +#define AT_XDMAC_GE 0x1C /* Global Channel Enable Register */ > +#define AT_XDMAC_GD 0x20 /* Global Channel Disable Register */ > +#define AT_XDMAC_GS 0x24 /* Global Channel Status Register */ > +#define AT_XDMAC_GRS 0x28 /* Global Channel Read Suspend Register */ > +#define AT_XDMAC_GWS 0x2C /* Global Write Suspend Register */ > +#define AT_XDMAC_GRWS 0x30 /* Global Channel Read Write Suspend Register */ > +#define AT_XDMAC_GRWR 0x34 /* Global Channel Read Write Resume Register */ > +#define AT_XDMAC_GSWR 0x38 /* Global Channel Software Request Register */ > +#define AT_XDMAC_GSWS 0x3C /* Global channel Software Request Status Register */ > +#define AT_XDMAC_GSWF 0x40 /* Global Channel Software Flush Request Register */ > +#define AT_XDMAC_VERSION 0xFFC /* XDMAC Version Register */ > + > +/* Channel relative registers offsets */ > +#define AT_XDMAC_CIE 0x00 /* Channel Interrupt Enable Register */ > +#define AT_XDMAC_CIE_BIE BIT(0) /* End of Block Interrupt Enable Bit */ > +#define AT_XDMAC_CIE_LIE BIT(1) /* End of Linked List Interrupt Enable Bit */ > +#define AT_XDMAC_CIE_DIE BIT(2) /* End of Disable Interrupt Enable Bit */ > +#define AT_XDMAC_CIE_FIE BIT(3) /* End of Flush Interrupt Enable Bit */ > +#define AT_XDMAC_CIE_RBEIE BIT(4) /* Read Bus Error Interrupt Enable Bit */ > +#define AT_XDMAC_CIE_WBEIE BIT(5) /* Write Bus Error Interrupt Enable Bit */ > +#define AT_XDMAC_CIE_ROIE BIT(6) /* Request Overflow Interrupt Enable Bit */ > +#define AT_XDMAC_CID 0x04 /* Channel Interrupt Disable Register */ > +#define AT_XDMAC_CID_BID BIT(0) /* End of Block Interrupt Disable Bit */ > +#define AT_XDMAC_CID_LID BIT(1) /* End of Linked List Interrupt Disable Bit */ > +#define AT_XDMAC_CID_DID BIT(2) /* End of Disable Interrupt Disable Bit */ > +#define AT_XDMAC_CID_FID BIT(3) /* End of Flush Interrupt Disable Bit */ > +#define AT_XDMAC_CID_RBEID BIT(4) /* Read Bus Error Interrupt Disable Bit */ > +#define AT_XDMAC_CID_WBEID BIT(5) /* Write Bus Error Interrupt Disable Bit */ > +#define AT_XDMAC_CID_ROID BIT(6) /* Request Overflow Interrupt Disable Bit */ > +#define AT_XDMAC_CIM 0x08 /* Channel Interrupt Mask Register */ > +#define AT_XDMAC_CIM_BIM BIT(0) /* End of Block Interrupt Mask Bit */ > +#define AT_XDMAC_CIM_LIM BIT(1) /* End of Linked List Interrupt Mask Bit */ > +#define AT_XDMAC_CIM_DIM BIT(2) /* End of Disable Interrupt Mask Bit */ > +#define AT_XDMAC_CIM_FIM BIT(3) /* End of Flush Interrupt Mask Bit */ > +#define AT_XDMAC_CIM_RBEIM BIT(4) /* Read Bus Error Interrupt Mask Bit */ > +#define AT_XDMAC_CIM_WBEIM BIT(5) /* Write Bus Error Interrupt Mask Bit */ > +#define AT_XDMAC_CIM_ROIM BIT(6) /* Request Overflow Interrupt Mask Bit */ > +#define AT_XDMAC_CIS 0x0C /* Channel Interrupt Status Register */ > +#define AT_XDMAC_CIS_BIS BIT(0) /* End of Block Interrupt Status Bit */ > +#define AT_XDMAC_CIS_LIS BIT(1) /* End of Linked List Interrupt Status Bit */ > +#define AT_XDMAC_CIS_DIS BIT(2) /* End of Disable Interrupt Status Bit */ > +#define AT_XDMAC_CIS_FIS BIT(3) /* End of Flush Interrupt Status Bit */ > +#define AT_XDMAC_CIS_RBEIS BIT(4) /* Read Bus Error Interrupt Status Bit */ > +#define AT_XDMAC_CIS_WBEIS BIT(5) /* Write Bus Error Interrupt Status Bit */ > +#define AT_XDMAC_CIS_ROIS BIT(6) /* Request Overflow Interrupt Status Bit */ > +#define AT_XDMAC_CSA 0x10 /* Channel Source Address Register */ > +#define AT_XDMAC_CDA 0x14 /* Channel Destination Address Register */ > +#define AT_XDMAC_CNDA 0x18 /* Channel Next Descriptor Address Register */ > +#define AT_XDMAC_CNDA_NDAIF(i) ((i) & 0x1) /* Channel x Next Descriptor Interface */ > +#define AT_XDMAC_CNDA_NDA(i) ((i) & 0xfffffffc) /* Channel x Next Descriptor Address */ > +#define AT_XDMAC_CNDC 0x1C /* Channel Next Descriptor Control Register */ > +#define AT_XDMAC_CNDC_NDE (0x1 << 0) /* Channel x Next Descriptor Enable */ > +#define AT_XDMAC_CNDC_NDSUP (0x1 << 1) /* Channel x Next Descriptor Source Update */ > +#define AT_XDMAC_CNDC_NDDUP (0x1 << 2) /* Channel x Next Descriptor Destination Update */ > +#define AT_XDMAC_CNDC_NDVIEW_NDV0 (0x0 << 3) /* Channel x Next Descriptor View 0 */ > +#define AT_XDMAC_CNDC_NDVIEW_NDV1 (0x1 << 3) /* Channel x Next Descriptor View 1 */ > +#define AT_XDMAC_CNDC_NDVIEW_NDV2 (0x2 << 3) /* Channel x Next Descriptor View 2 */ > +#define AT_XDMAC_CNDC_NDVIEW_NDV3 (0x3 << 3) /* Channel x Next Descriptor View 3 */ > +#define AT_XDMAC_CUBC 0x20 /* Channel Microblock Control Register */ > +#define AT_XDMAC_CBC 0x24 /* Channel Block Control Register */ > +#define AT_XDMAC_CC 0x28 /* Channel Configuration Register */ > +#define AT_XDMAC_CC_TYPE (0x1 << 0) /* Channel Transfer Type */ > +#define AT_XDMAC_CC_TYPE_MEM_TRAN (0x0 << 0) /* Memory to Memory Transfer */ > +#define AT_XDMAC_CC_TYPE_PER_TRAN (0x1 << 0) /* Peripheral to Memory or Memory to Peripheral Transfer */ > +#define AT_XDMAC_CC_MBSIZE_MASK (0x3 << 1) > +#define AT_XDMAC_CC_MBSIZE_SINGLE (0x0 << 1) > +#define AT_XDMAC_CC_MBSIZE_FOUR (0x1 << 1) > +#define AT_XDMAC_CC_MBSIZE_EIGHT (0x2 << 1) > +#define AT_XDMAC_CC_MBSIZE_SIXTEEN (0x3 << 1) > +#define AT_XDMAC_CC_DSYNC (0x1 << 4) /* Channel Synchronization */ > +#define AT_XDMAC_CC_DSYNC_PER2MEM (0x0 << 4) > +#define AT_XDMAC_CC_DSYNC_MEM2PER (0x1 << 4) > +#define AT_XDMAC_CC_PROT (0x1 << 5) /* Channel Protection */ > +#define AT_XDMAC_CC_PROT_SEC (0x0 << 5) > +#define AT_XDMAC_CC_PROT_UNSEC (0x1 << 5) > +#define AT_XDMAC_CC_SWREQ (0x1 << 6) /* Channel Software Request Trigger */ > +#define AT_XDMAC_CC_SWREQ_HWR_CONNECTED (0x0 << 6) > +#define AT_XDMAC_CC_SWREQ_SWR_CONNECTED (0x1 << 6) > +#define AT_XDMAC_CC_MEMSET (0x1 << 7) /* Channel Fill Block of memory */ > +#define AT_XDMAC_CC_MEMSET_NORMAL_MODE (0x0 << 7) > +#define AT_XDMAC_CC_MEMSET_HW_MODE (0x1 << 7) > +#define AT_XDMAC_CC_CSIZE_MASK (0x7 << 8) /* Channel Chunk Size */ > +#define AT_XDMAC_CC_CSIZE_CHK_1 (0x0 << 8) > +#define AT_XDMAC_CC_CSIZE_CHK_2 (0x1 << 8) > +#define AT_XDMAC_CC_CSIZE_CHK_4 (0x2 << 8) > +#define AT_XDMAC_CC_CSIZE_CHK_8 (0x3 << 8) > +#define AT_XDMAC_CC_CSIZE_CHK_16 (0x4 << 8) > +#define AT_XDMAC_CC_DWIDTH(i) ((i) << 11) /* Channel Data Width */ > +#define AT_XDMAC_CC_DWIDTH_BYTE 0x0 > +#define AT_XDMAC_CC_DWIDTH_HALFWORD 0x1 > +#define AT_XDMAC_CC_DWIDTH_WORD 0x2 > +#define AT_XDMAC_CC_DWIDTH_DWORD 0x3 > +#define AT_XDMAC_CC_SIF(i) ((0x1 & (i)) << 13) /* Channel Source Interface Identifier */ > +#define AT_XDMAC_CC_DIF(i) ((0x1 & (i)) << 14) /* Channel Destination Interface Identifier */ > +#define AT_XDMAC_CC_SAM_MASK (0x3 << 16) /* Channel Source Addressing Mode */ > +#define AT_XDMAC_CC_SAM_FIXED_AM (0x0 << 16) > +#define AT_XDMAC_CC_SAM_INCREMENTED_AM (0x1 << 16) > +#define AT_XDMAC_CC_SAM_UBS_AM (0x2 << 16) > +#define AT_XDMAC_CC_SAM_UBS_DS_AM (0x3 << 16) > +#define AT_XDMAC_CC_DAM_MASK (0x3 << 18) /* Channel Source Addressing Mode */ > +#define AT_XDMAC_CC_DAM_FIXED_AM (0x0 << 18) > +#define AT_XDMAC_CC_DAM_INCREMENTED_AM (0x1 << 18) > +#define AT_XDMAC_CC_DAM_UBS_AM (0x2 << 18) > +#define AT_XDMAC_CC_DAM_UBS_DS_AM (0x3 << 18) > +#define AT_XDMAC_CC_INITD (0x1 << 21) /* Channel Initialization Terminated (read only) */ > +#define AT_XDMAC_CC_INITD_TERMINATED (0x0 << 21) > +#define AT_XDMAC_CC_INITD_IN_PROGRESS (0x1 << 21) > +#define AT_XDMAC_CC_RDIP (0x1 << 22) /* Read in Progress (read only) */ > +#define AT_XDMAC_CC_RDIP_DONE (0x0 << 22) > +#define AT_XDMAC_CC_RDIP_IN_PROGRESS (0x1 << 22) > +#define AT_XDMAC_CC_WDIP (0x1 << 23) /* Write in Progress (read only) */ > +#define AT_XDMAC_CC_WDIP_DONE (0x0 << 23) > +#define AT_XDMAC_CC_WDIP_IN_PROGRESS (0x1 << 23) > +#define AT_XDMAC_CC_PERID(i) (0x7f & (h) << 24) /* Channel Peripheral Identifier */ > +#define AT_XDMAC_CDS_MSP 0x2C /* Channel Data Stride Memory Set Pattern */ > +#define AT_XDMAC_CSUS 0x30 /* Channel Source Microblock Stride */ > +#define AT_XDMAC_CDUS 0x34 /* Channel Destination Microblock Stride */ > + > +#define AT_XDMAC_CHAN_REG_BASE 0x50 /* Channel registers base address */ > + > +/* Microblock control members */ > +#define AT_XDMAC_MBR_UBC_UBLEN_MAX 0xFFFFFFUL /* Maximum Microblock Length */ > +#define AT_XDMAC_MBR_UBC_NDE (0x1 << 24) /* Next Descriptor Enable */ > +#define AT_XDMAC_MBR_UBC_NSEN (0x1 << 25) /* Next Descriptor Source Update */ > +#define AT_XDMAC_MBR_UBC_NDEN (0x1 << 26) /* Next Descriptor Destination Update */ > +#define AT_XDMAC_MBR_UBC_NDV0 (0x0 << 27) /* Next Descriptor View 0 */ > +#define AT_XDMAC_MBR_UBC_NDV1 (0x1 << 27) /* Next Descriptor View 1 */ > +#define AT_XDMAC_MBR_UBC_NDV2 (0x2 << 27) /* Next Descriptor View 2 */ > +#define AT_XDMAC_MBR_UBC_NDV3 (0x3 << 27) /* Next Descriptor View 3 */ > + > +#define AT_XDMAC_MAX_CHAN 0x20 > + > +enum atc_status { > + AT_XDMAC_CHAN_IS_CYCLIC = 0, > + AT_XDMAC_CHAN_IS_PAUSED, > +}; > + > +/* ----- Channels ----- */ > +struct at_xdmac_chan { > + struct dma_chan chan; > + void __iomem *ch_regs; > + u32 mask; /* Channel Mask */ > + u32 cfg; /* Channel Configuration Register */ > + u8 perid; /* Peripheral ID */ > + u8 dwidth; /* Data Width */ > + u8 perif; /* Peripheral Interface */ > + u8 memif; /* Memory Interface */ > + u32 save_cim; > + u32 save_cnda; > + u32 save_cndc; > + unsigned long status; > + struct tasklet_struct tasklet; > + struct dma_slave_config dma_sconfig; > + > + spinlock_t lock; > + > + struct list_head xfers_list; > + struct list_head free_descs_list; > +}; > + > + > +/* ----- Controller ----- */ > +struct at_xdmac { > + struct dma_device dma; > + void __iomem *regs; > + int irq; > + struct clk *clk; > + u32 save_gim; > + u32 save_gs; > + struct dma_pool *at_xdmac_desc_pool; > + struct at_xdmac_chan chan[0]; > +}; > + > + > +/* ----- Descriptors ----- */ > + > +/* Linked List Descriptor */ > +struct at_xdmac_lld { > + dma_addr_t mbr_nda; /* Next Descriptor Member */ > + u32 mbr_ubc; /* Microblock Control Member */ > + dma_addr_t mbr_sa; /* Source Address Member */ > + dma_addr_t mbr_da; /* Destination Address Member */ > + u32 mbr_cfg; /* Configuration Register */ > +}; > + > + > +struct at_xdmac_desc { > + struct at_xdmac_lld lld; > + enum dma_transfer_direction direction; > + struct dma_async_tx_descriptor tx_dma_desc; > + struct list_head desc_node; > + /* Following members are only used by the first descriptor */ > + bool active_xfer; > + unsigned int xfer_size; > + struct list_head descs_list; > + struct list_head xfer_node; > +}; > + > +static inline void __iomem *at_xdmac_chan_reg_base(struct at_xdmac *atxdmac, unsigned int chan_nb) > +{ > + return (void __iomem *)(atxdmac->regs + (AT_XDMAC_CHAN_REG_BASE + chan_nb * 0x40)); > +} > + > +#define at_xdmac_read(atxdmac, reg) readl_relaxed((atxdmac)->regs + (reg)) > +#define at_xdmac_write(atxdmac, reg, value) \ > + writel_relaxed((value), (atxdmac)->regs + (reg)) > + > +#define at_xdmac_chan_read(atchan, reg) readl_relaxed((atchan)->ch_regs + (reg)) > +#define at_xdmac_chan_write(atchan, reg, value) writel_relaxed((value), (atchan)->ch_regs + (reg)) > + > +static inline struct at_xdmac_chan *to_at_xdmac_chan(struct dma_chan *dchan) > +{ > + return container_of(dchan, struct at_xdmac_chan, chan); > +} > + > +static struct device *chan2dev(struct dma_chan *chan) > +{ > + return &chan->dev->device; > +} > + > +static inline struct at_xdmac *to_at_xdmac(struct dma_device *ddev) > +{ > + return container_of(ddev, struct at_xdmac, dma); > +} > + > +static inline struct at_xdmac_desc *txd_to_at_desc(struct dma_async_tx_descriptor *txd) > +{ > + return container_of(txd, struct at_xdmac_desc, tx_dma_desc); > +} > + > +static inline int at_xdmac_chan_is_cyclic(struct at_xdmac_chan *atchan) > +{ > + return test_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status); > +} > + > +static inline int at_xdmac_chan_is_paused(struct at_xdmac_chan *atchan) > +{ > + return test_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status); > +} > + > +static inline u32 at_xdmac_csize(u32 maxburst) > +{ > + u32 csize; > + > + switch (ffs(maxburst) - 1) { > + case 1: > + csize = AT_XDMAC_CC_CSIZE_CHK_2; > + break; > + case 2: > + csize = AT_XDMAC_CC_CSIZE_CHK_4; > + break; > + case 3: > + csize = AT_XDMAC_CC_CSIZE_CHK_8; > + break; > + case 4: > + csize = AT_XDMAC_CC_CSIZE_CHK_16; > + default: > + csize = AT_XDMAC_CC_CSIZE_CHK_1; > + } > + > + return csize; > +}; > +#endif /* __AT_XDMAC_H__ */ > diff --git a/include/dt-bindings/dma/at91.h b/include/dt-bindings/dma/at91.h > index e835037..4875a50 100644 > --- a/include/dt-bindings/dma/at91.h > +++ b/include/dt-bindings/dma/at91.h > @@ -9,6 +9,8 @@ > #ifndef __DT_BINDINGS_AT91_DMA_H__ > #define __DT_BINDINGS_AT91_DMA_H__ > > +/* ---------- HDMAC ---------- */ > + > /* > * Source and/or destination peripheral ID > */ > @@ -24,4 +26,27 @@ > #define AT91_DMA_CFG_FIFOCFG_ALAP (0x1 << AT91_DMA_CFG_FIFOCFG_OFFSET) /* largest defined AHB burst */ > #define AT91_DMA_CFG_FIFOCFG_ASAP (0x2 << AT91_DMA_CFG_FIFOCFG_OFFSET) /* single AHB access */ > > + > +/* ---------- XDMAC ---------- */ > +#define AT91_XDMAC_DT_MEM_IF_MASK (0x1) > +#define AT91_XDMAC_DT_MEM_IF_OFFSET (16) > +#define AT91_XDMAC_DT_MEM_IF(mem_if) (((mem_if) & AT91_XDMAC_DT_MEM_IF_MASK) \ > + << AT91_XDMAC_DT_MEM_IF_OFFSET) > +#define AT91_XDMAC_DT_GET_MEM_IF(cfg) (((cfg) >> AT91_XDMAC_DT_MEM_IF_OFFSET) \ > + & AT91_XDMAC_DT_MEM_IF_MASK) > + > +#define AT91_XDMAC_DT_PER_IF_MASK (0x1) > +#define AT91_XDMAC_DT_PER_IF_OFFSET (0) > +#define AT91_XDMAC_DT_PER_IF(per_if) (((per_if) & AT91_XDMAC_DT_PER_IF_MASK) \ > + << AT91_XDMAC_DT_PER_IF_OFFSET) > +#define AT91_XDMAC_DT_GET_PER_IF(cfg) (((cfg) >> AT91_XDMAC_DT_PER_IF_OFFSET) \ > + & AT91_XDMAC_DT_PER_IF_MASK) > + > +#define AT91_XDMAC_DT_PERID_MASK (0x7f) > +#define AT91_XDMAC_DT_PERID_OFFSET (24) > +#define AT91_XDMAC_DT_PERID(perid) (((perid) & AT91_XDMAC_DT_PERID_MASK) \ > + << AT91_XDMAC_DT_PERID_OFFSET) > +#define AT91_XDMAC_DT_GET_PERID(cfg) (((cfg) >> AT91_XDMAC_DT_PERID_OFFSET) \ > + & AT91_XDMAC_DT_PERID_MASK) > + > #endif /* __DT_BINDINGS_AT91_DMA_H__ */ > -- Nicolas Ferre -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
