diff options
author | Vinod Koul <vinod.koul@intel.com> | 2017-11-14 10:33:16 +0530 |
---|---|---|
committer | Vinod Koul <vinod.koul@intel.com> | 2017-11-14 10:33:16 +0530 |
commit | c7960fc5e0f445bc4c9e096814ed31efed469406 (patch) | |
tree | a6f67cbc9ba893663dc44832b1e91391004067c4 /drivers/dma | |
parent | 4cd46d0c5e6e456dedc9ac4cd2f9cc37b96a5dd5 (diff) | |
parent | 6b4faeac05bc0b91616b921191cb054d1376f3b4 (diff) |
Merge branch 'topic/qcom' into for-linus
Diffstat (limited to 'drivers/dma')
-rw-r--r-- | drivers/dma/qcom/bam_dma.c | 169 |
1 files changed, 109 insertions, 60 deletions
diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c index 6d89fb6a6a92..d076940e0c69 100644 --- a/drivers/dma/qcom/bam_dma.c +++ b/drivers/dma/qcom/bam_dma.c @@ -46,6 +46,7 @@ #include <linux/of_address.h> #include <linux/of_irq.h> #include <linux/of_dma.h> +#include <linux/circ_buf.h> #include <linux/clk.h> #include <linux/dmaengine.h> #include <linux/pm_runtime.h> @@ -78,6 +79,8 @@ struct bam_async_desc { struct bam_desc_hw *curr_desc; + /* list node for the desc in the bam_chan list of descriptors */ + struct list_head desc_node; enum dma_transfer_direction dir; size_t length; struct bam_desc_hw desc[0]; @@ -347,6 +350,8 @@ static const struct reg_offset_data bam_v1_7_reg_info[] = { #define BAM_DESC_FIFO_SIZE SZ_32K #define MAX_DESCRIPTORS (BAM_DESC_FIFO_SIZE / sizeof(struct bam_desc_hw) - 1) #define BAM_FIFO_SIZE (SZ_32K - 8) +#define IS_BUSY(chan) (CIRC_SPACE(bchan->tail, bchan->head,\ + MAX_DESCRIPTORS + 1) == 0) struct bam_chan { struct virt_dma_chan vc; @@ -356,8 +361,6 @@ struct bam_chan { /* configuration from device tree */ u32 id; - struct bam_async_desc *curr_txd; /* current running dma */ - /* runtime configuration */ struct dma_slave_config slave; @@ -372,6 +375,8 @@ struct bam_chan { unsigned int initialized; /* is the channel hw initialized? */ unsigned int paused; /* is the channel paused? */ unsigned int reconfigure; /* new slave config? */ + /* list of descriptors currently processed */ + struct list_head desc_list; struct list_head node; }; @@ -539,7 +544,7 @@ static void bam_free_chan(struct dma_chan *chan) vchan_free_chan_resources(to_virt_chan(chan)); - if (bchan->curr_txd) { + if (!list_empty(&bchan->desc_list)) { dev_err(bchan->bdev->dev, "Cannot free busy channel\n"); goto err; } @@ -632,8 +637,6 @@ static struct dma_async_tx_descriptor *bam_prep_slave_sg(struct dma_chan *chan, if (flags & DMA_PREP_INTERRUPT) async_desc->flags |= DESC_FLAG_EOT; - else - async_desc->flags |= DESC_FLAG_INT; async_desc->num_desc = num_alloc; async_desc->curr_desc = async_desc->desc; @@ -684,14 +687,16 @@ err_out: static int bam_dma_terminate_all(struct dma_chan *chan) { struct bam_chan *bchan = to_bam_chan(chan); + struct bam_async_desc *async_desc, *tmp; unsigned long flag; LIST_HEAD(head); /* remove all transactions, including active transaction */ spin_lock_irqsave(&bchan->vc.lock, flag); - if (bchan->curr_txd) { - list_add(&bchan->curr_txd->vd.node, &bchan->vc.desc_issued); - bchan->curr_txd = NULL; + list_for_each_entry_safe(async_desc, tmp, + &bchan->desc_list, desc_node) { + list_add(&async_desc->vd.node, &bchan->vc.desc_issued); + list_del(&async_desc->desc_node); } vchan_get_all_descriptors(&bchan->vc, &head); @@ -763,9 +768,9 @@ static int bam_resume(struct dma_chan *chan) */ static u32 process_channel_irqs(struct bam_device *bdev) { - u32 i, srcs, pipe_stts; + u32 i, srcs, pipe_stts, offset, avail; unsigned long flags; - struct bam_async_desc *async_desc; + struct bam_async_desc *async_desc, *tmp; srcs = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_SRCS_EE)); @@ -785,27 +790,40 @@ static u32 process_channel_irqs(struct bam_device *bdev) writel_relaxed(pipe_stts, bam_addr(bdev, i, BAM_P_IRQ_CLR)); spin_lock_irqsave(&bchan->vc.lock, flags); - async_desc = bchan->curr_txd; - if (async_desc) { - async_desc->num_desc -= async_desc->xfer_len; - async_desc->curr_desc += async_desc->xfer_len; - bchan->curr_txd = NULL; + offset = readl_relaxed(bam_addr(bdev, i, BAM_P_SW_OFSTS)) & + P_SW_OFSTS_MASK; + offset /= sizeof(struct bam_desc_hw); + + /* Number of bytes available to read */ + avail = CIRC_CNT(offset, bchan->head, MAX_DESCRIPTORS + 1); + + list_for_each_entry_safe(async_desc, tmp, + &bchan->desc_list, desc_node) { + /* Not enough data to read */ + if (avail < async_desc->xfer_len) + break; /* manage FIFO */ bchan->head += async_desc->xfer_len; bchan->head %= MAX_DESCRIPTORS; + async_desc->num_desc -= async_desc->xfer_len; + async_desc->curr_desc += async_desc->xfer_len; + avail -= async_desc->xfer_len; + /* - * if complete, process cookie. Otherwise + * if complete, process cookie. Otherwise * push back to front of desc_issued so that * it gets restarted by the tasklet */ - if (!async_desc->num_desc) + if (!async_desc->num_desc) { vchan_cookie_complete(&async_desc->vd); - else + } else { list_add(&async_desc->vd.node, - &bchan->vc.desc_issued); + &bchan->vc.desc_issued); + } + list_del(&async_desc->desc_node); } spin_unlock_irqrestore(&bchan->vc.lock, flags); @@ -867,6 +885,7 @@ static enum dma_status bam_tx_status(struct dma_chan *chan, dma_cookie_t cookie, struct dma_tx_state *txstate) { struct bam_chan *bchan = to_bam_chan(chan); + struct bam_async_desc *async_desc; struct virt_dma_desc *vd; int ret; size_t residue = 0; @@ -882,11 +901,17 @@ static enum dma_status bam_tx_status(struct dma_chan *chan, dma_cookie_t cookie, spin_lock_irqsave(&bchan->vc.lock, flags); vd = vchan_find_desc(&bchan->vc, cookie); - if (vd) + if (vd) { residue = container_of(vd, struct bam_async_desc, vd)->length; - else if (bchan->curr_txd && bchan->curr_txd->vd.tx.cookie == cookie) - for (i = 0; i < bchan->curr_txd->num_desc; i++) - residue += bchan->curr_txd->curr_desc[i].size; + } else { + list_for_each_entry(async_desc, &bchan->desc_list, desc_node) { + if (async_desc->vd.tx.cookie != cookie) + continue; + + for (i = 0; i < async_desc->num_desc; i++) + residue += async_desc->curr_desc[i].size; + } + } spin_unlock_irqrestore(&bchan->vc.lock, flags); @@ -927,63 +952,86 @@ static void bam_start_dma(struct bam_chan *bchan) { struct virt_dma_desc *vd = vchan_next_desc(&bchan->vc); struct bam_device *bdev = bchan->bdev; - struct bam_async_desc *async_desc; + struct bam_async_desc *async_desc = NULL; struct bam_desc_hw *desc; struct bam_desc_hw *fifo = PTR_ALIGN(bchan->fifo_virt, sizeof(struct bam_desc_hw)); int ret; + unsigned int avail; + struct dmaengine_desc_callback cb; lockdep_assert_held(&bchan->vc.lock); if (!vd) return; - list_del(&vd->node); - - async_desc = container_of(vd, struct bam_async_desc, vd); - bchan->curr_txd = async_desc; - ret = pm_runtime_get_sync(bdev->dev); if (ret < 0) return; - /* on first use, initialize the channel hardware */ - if (!bchan->initialized) - bam_chan_init_hw(bchan, async_desc->dir); + while (vd && !IS_BUSY(bchan)) { + list_del(&vd->node); - /* apply new slave config changes, if necessary */ - if (bchan->reconfigure) - bam_apply_new_config(bchan, async_desc->dir); + async_desc = container_of(vd, struct bam_async_desc, vd); - desc = bchan->curr_txd->curr_desc; + /* on first use, initialize the channel hardware */ + if (!bchan->initialized) + bam_chan_init_hw(bchan, async_desc->dir); - if (async_desc->num_desc > MAX_DESCRIPTORS) - async_desc->xfer_len = MAX_DESCRIPTORS; - else - async_desc->xfer_len = async_desc->num_desc; + /* apply new slave config changes, if necessary */ + if (bchan->reconfigure) + bam_apply_new_config(bchan, async_desc->dir); - /* set any special flags on the last descriptor */ - if (async_desc->num_desc == async_desc->xfer_len) - desc[async_desc->xfer_len - 1].flags |= - cpu_to_le16(async_desc->flags); - else - desc[async_desc->xfer_len - 1].flags |= - cpu_to_le16(DESC_FLAG_INT); + desc = async_desc->curr_desc; + avail = CIRC_SPACE(bchan->tail, bchan->head, + MAX_DESCRIPTORS + 1); + + if (async_desc->num_desc > avail) + async_desc->xfer_len = avail; + else + async_desc->xfer_len = async_desc->num_desc; + + /* set any special flags on the last descriptor */ + if (async_desc->num_desc == async_desc->xfer_len) + desc[async_desc->xfer_len - 1].flags |= + cpu_to_le16(async_desc->flags); - if (bchan->tail + async_desc->xfer_len > MAX_DESCRIPTORS) { - u32 partial = MAX_DESCRIPTORS - bchan->tail; + vd = vchan_next_desc(&bchan->vc); - memcpy(&fifo[bchan->tail], desc, - partial * sizeof(struct bam_desc_hw)); - memcpy(fifo, &desc[partial], (async_desc->xfer_len - partial) * + dmaengine_desc_get_callback(&async_desc->vd.tx, &cb); + + /* + * An interrupt is generated at this desc, if + * - FIFO is FULL. + * - No more descriptors to add. + * - If a callback completion was requested for this DESC, + * In this case, BAM will deliver the completion callback + * for this desc and continue processing the next desc. + */ + if (((avail <= async_desc->xfer_len) || !vd || + dmaengine_desc_callback_valid(&cb)) && + !(async_desc->flags & DESC_FLAG_EOT)) + desc[async_desc->xfer_len - 1].flags |= + cpu_to_le16(DESC_FLAG_INT); + + if (bchan->tail + async_desc->xfer_len > MAX_DESCRIPTORS) { + u32 partial = MAX_DESCRIPTORS - bchan->tail; + + memcpy(&fifo[bchan->tail], desc, + partial * sizeof(struct bam_desc_hw)); + memcpy(fifo, &desc[partial], + (async_desc->xfer_len - partial) * sizeof(struct bam_desc_hw)); - } else { - memcpy(&fifo[bchan->tail], desc, - async_desc->xfer_len * sizeof(struct bam_desc_hw)); - } + } else { + memcpy(&fifo[bchan->tail], desc, + async_desc->xfer_len * + sizeof(struct bam_desc_hw)); + } - bchan->tail += async_desc->xfer_len; - bchan->tail %= MAX_DESCRIPTORS; + bchan->tail += async_desc->xfer_len; + bchan->tail %= MAX_DESCRIPTORS; + list_add_tail(&async_desc->desc_node, &bchan->desc_list); + } /* ensure descriptor writes and dma start not reordered */ wmb(); @@ -1012,7 +1060,7 @@ static void dma_tasklet(unsigned long data) bchan = &bdev->channels[i]; spin_lock_irqsave(&bchan->vc.lock, flags); - if (!list_empty(&bchan->vc.desc_issued) && !bchan->curr_txd) + if (!list_empty(&bchan->vc.desc_issued) && !IS_BUSY(bchan)) bam_start_dma(bchan); spin_unlock_irqrestore(&bchan->vc.lock, flags); } @@ -1033,7 +1081,7 @@ static void bam_issue_pending(struct dma_chan *chan) spin_lock_irqsave(&bchan->vc.lock, flags); /* if work pending and idle, start a transaction */ - if (vchan_issue_pending(&bchan->vc) && !bchan->curr_txd) + if (vchan_issue_pending(&bchan->vc) && !IS_BUSY(bchan)) bam_start_dma(bchan); spin_unlock_irqrestore(&bchan->vc.lock, flags); @@ -1133,6 +1181,7 @@ static void bam_channel_init(struct bam_device *bdev, struct bam_chan *bchan, vchan_init(&bchan->vc, &bdev->common); bchan->vc.desc_free = bam_dma_free_desc; + INIT_LIST_HEAD(&bchan->desc_list); } static const struct of_device_id bam_of_match[] = { |