diff options
author | David S. Miller <davem@davemloft.net> | 2010-03-15 23:23:54 (GMT) |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2010-03-15 23:23:54 (GMT) |
commit | 4961e02f1999e1c3468c09b2669c94d7c3ae82a8 (patch) | |
tree | 44c15abb09d7ba5e17a9aba95ee246648b1c1a8a /drivers/dma/coh901318.c | |
parent | d14a0ebda7d3daede1a99c01527affb9ceaa4c22 (diff) | |
parent | a3d3203e4bb40f253b1541e310dc0f9305be7c84 (diff) | |
download | linux-fsl-qoriq-4961e02f1999e1c3468c09b2669c94d7c3ae82a8.tar.xz |
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
Diffstat (limited to 'drivers/dma/coh901318.c')
-rw-r--r-- | drivers/dma/coh901318.c | 182 |
1 files changed, 96 insertions, 86 deletions
diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c index 64a9372..1656fdc 100644 --- a/drivers/dma/coh901318.c +++ b/drivers/dma/coh901318.c @@ -39,7 +39,6 @@ struct coh901318_desc { unsigned int sg_len; struct coh901318_lli *data; enum dma_data_direction dir; - int pending_irqs; unsigned long flags; }; @@ -72,7 +71,6 @@ struct coh901318_chan { unsigned long nbr_active_done; unsigned long busy; - int pending_irqs; struct coh901318_base *base; }; @@ -80,18 +78,16 @@ struct coh901318_chan { static void coh901318_list_print(struct coh901318_chan *cohc, struct coh901318_lli *lli) { - struct coh901318_lli *l; - dma_addr_t addr = virt_to_phys(lli); + struct coh901318_lli *l = lli; int i = 0; - while (addr) { - l = phys_to_virt(addr); + while (l) { dev_vdbg(COHC_2_DEV(cohc), "i %d, lli %p, ctrl 0x%x, src 0x%x" - ", dst 0x%x, link 0x%x link_virt 0x%p\n", + ", dst 0x%x, link 0x%x virt_link_addr 0x%p\n", i, l, l->control, l->src_addr, l->dst_addr, - l->link_addr, phys_to_virt(l->link_addr)); + l->link_addr, l->virt_link_addr); i++; - addr = l->link_addr; + l = l->virt_link_addr; } } @@ -125,7 +121,7 @@ static int coh901318_debugfs_read(struct file *file, char __user *buf, goto err_kmalloc; tmp = dev_buf; - tmp += sprintf(tmp, "DMA -- enable dma channels\n"); + tmp += sprintf(tmp, "DMA -- enabled dma channels\n"); for (i = 0; i < debugfs_dma_base->platform->max_channels; i++) if (started_channels & (1 << i)) @@ -337,16 +333,22 @@ coh901318_desc_get(struct coh901318_chan *cohc) * TODO: alloc a pile of descs instead of just one, * avoid many small allocations. */ - desc = kmalloc(sizeof(struct coh901318_desc), GFP_NOWAIT); + desc = kzalloc(sizeof(struct coh901318_desc), GFP_NOWAIT); if (desc == NULL) goto out; INIT_LIST_HEAD(&desc->node); + dma_async_tx_descriptor_init(&desc->desc, &cohc->chan); } else { /* Reuse an old desc. */ desc = list_first_entry(&cohc->free, struct coh901318_desc, node); list_del(&desc->node); + /* Initialize it a bit so it's not insane */ + desc->sg = NULL; + desc->sg_len = 0; + desc->desc.callback = NULL; + desc->desc.callback_param = NULL; } out: @@ -364,10 +366,6 @@ static void coh901318_desc_submit(struct coh901318_chan *cohc, struct coh901318_desc *desc) { list_add_tail(&desc->node, &cohc->active); - - BUG_ON(cohc->pending_irqs != 0); - - cohc->pending_irqs = desc->pending_irqs; } static struct coh901318_desc * @@ -592,6 +590,10 @@ static struct coh901318_desc *coh901318_queue_start(struct coh901318_chan *cohc) return cohd_que; } +/* + * This tasklet is called from the interrupt handler to + * handle each descriptor (DMA job) that is sent to a channel. + */ static void dma_tasklet(unsigned long data) { struct coh901318_chan *cohc = (struct coh901318_chan *) data; @@ -600,55 +602,58 @@ static void dma_tasklet(unsigned long data) dma_async_tx_callback callback; void *callback_param; + dev_vdbg(COHC_2_DEV(cohc), "[%s] chan_id %d" + " nbr_active_done %ld\n", __func__, + cohc->id, cohc->nbr_active_done); + spin_lock_irqsave(&cohc->lock, flags); - /* get first active entry from list */ + /* get first active descriptor entry from list */ cohd_fin = coh901318_first_active_get(cohc); - BUG_ON(cohd_fin->pending_irqs == 0); - if (cohd_fin == NULL) goto err; - cohd_fin->pending_irqs--; - cohc->completed = cohd_fin->desc.cookie; + /* locate callback to client */ + callback = cohd_fin->desc.callback; + callback_param = cohd_fin->desc.callback_param; - if (cohc->nbr_active_done == 0) - return; + /* sign this job as completed on the channel */ + cohc->completed = cohd_fin->desc.cookie; - if (!cohd_fin->pending_irqs) { - /* release the lli allocation*/ - coh901318_lli_free(&cohc->base->pool, &cohd_fin->data); - } + /* release the lli allocation and remove the descriptor */ + coh901318_lli_free(&cohc->base->pool, &cohd_fin->data); - dev_vdbg(COHC_2_DEV(cohc), "[%s] chan_id %d pending_irqs %d" - " nbr_active_done %ld\n", __func__, - cohc->id, cohc->pending_irqs, cohc->nbr_active_done); + /* return desc to free-list */ + coh901318_desc_remove(cohd_fin); + coh901318_desc_free(cohc, cohd_fin); - /* callback to client */ - callback = cohd_fin->desc.callback; - callback_param = cohd_fin->desc.callback_param; - - if (!cohd_fin->pending_irqs) { - coh901318_desc_remove(cohd_fin); + spin_unlock_irqrestore(&cohc->lock, flags); - /* return desc to free-list */ - coh901318_desc_free(cohc, cohd_fin); - } + /* Call the callback when we're done */ + if (callback) + callback(callback_param); - if (cohc->nbr_active_done) - cohc->nbr_active_done--; + spin_lock_irqsave(&cohc->lock, flags); + /* + * If another interrupt fired while the tasklet was scheduling, + * we don't get called twice, so we have this number of active + * counter that keep track of the number of IRQs expected to + * be handled for this channel. If there happen to be more than + * one IRQ to be ack:ed, we simply schedule this tasklet again. + */ + cohc->nbr_active_done--; if (cohc->nbr_active_done) { + dev_dbg(COHC_2_DEV(cohc), "scheduling tasklet again, new IRQs " + "came in while we were scheduling this tasklet\n"); if (cohc_chan_conf(cohc)->priority_high) tasklet_hi_schedule(&cohc->tasklet); else tasklet_schedule(&cohc->tasklet); } - spin_unlock_irqrestore(&cohc->lock, flags); - if (callback) - callback(callback_param); + spin_unlock_irqrestore(&cohc->lock, flags); return; @@ -667,16 +672,17 @@ static void dma_tc_handle(struct coh901318_chan *cohc) if (!cohc->allocated) return; - BUG_ON(cohc->pending_irqs == 0); + spin_lock(&cohc->lock); - cohc->pending_irqs--; cohc->nbr_active_done++; - if (cohc->pending_irqs == 0 && coh901318_queue_start(cohc) == NULL) + if (coh901318_queue_start(cohc) == NULL) cohc->busy = 0; BUG_ON(list_empty(&cohc->active)); + spin_unlock(&cohc->lock); + if (cohc_chan_conf(cohc)->priority_high) tasklet_hi_schedule(&cohc->tasklet); else @@ -870,6 +876,7 @@ coh901318_prep_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, struct coh901318_chan *cohc = to_coh901318_chan(chan); int lli_len; u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last; + int ret; spin_lock_irqsave(&cohc->lock, flg); @@ -890,22 +897,19 @@ coh901318_prep_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, if (data == NULL) goto err; - cohd = coh901318_desc_get(cohc); - cohd->sg = NULL; - cohd->sg_len = 0; - cohd->data = data; - - cohd->pending_irqs = - coh901318_lli_fill_memcpy( - &cohc->base->pool, data, src, size, dest, - cohc_chan_param(cohc)->ctrl_lli_chained, - ctrl_last); - cohd->flags = flags; + ret = coh901318_lli_fill_memcpy( + &cohc->base->pool, data, src, size, dest, + cohc_chan_param(cohc)->ctrl_lli_chained, + ctrl_last); + if (ret) + goto err; COH_DBG(coh901318_list_print(cohc, data)); - dma_async_tx_descriptor_init(&cohd->desc, chan); - + /* Pick a descriptor to handle this transfer */ + cohd = coh901318_desc_get(cohc); + cohd->data = data; + cohd->flags = flags; cohd->desc.tx_submit = coh901318_tx_submit; spin_unlock_irqrestore(&cohc->lock, flg); @@ -924,6 +928,7 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, struct coh901318_chan *cohc = to_coh901318_chan(chan); struct coh901318_lli *data; struct coh901318_desc *cohd; + const struct coh901318_params *params; struct scatterlist *sg; int len = 0; int size; @@ -931,7 +936,9 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, u32 ctrl_chained = cohc_chan_param(cohc)->ctrl_lli_chained; u32 ctrl = cohc_chan_param(cohc)->ctrl_lli; u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last; + u32 config; unsigned long flg; + int ret; if (!sgl) goto out; @@ -947,15 +954,14 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, /* Trigger interrupt after last lli */ ctrl_last |= COH901318_CX_CTRL_TC_IRQ_ENABLE; - cohd = coh901318_desc_get(cohc); - cohd->sg = NULL; - cohd->sg_len = 0; - cohd->dir = direction; + params = cohc_chan_param(cohc); + config = params->config; if (direction == DMA_TO_DEVICE) { u32 tx_flags = COH901318_CX_CTRL_PRDD_SOURCE | COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE; + config |= COH901318_CX_CFG_RM_MEMORY_TO_PRIMARY; ctrl_chained |= tx_flags; ctrl_last |= tx_flags; ctrl |= tx_flags; @@ -963,16 +969,14 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, u32 rx_flags = COH901318_CX_CTRL_PRDD_DEST | COH901318_CX_CTRL_DST_ADDR_INC_ENABLE; + config |= COH901318_CX_CFG_RM_PRIMARY_TO_MEMORY; ctrl_chained |= rx_flags; ctrl_last |= rx_flags; ctrl |= rx_flags; } else goto err_direction; - dma_async_tx_descriptor_init(&cohd->desc, chan); - - cohd->desc.tx_submit = coh901318_tx_submit; - + coh901318_set_conf(cohc, config); /* The dma only supports transmitting packages up to * MAX_DMA_PACKET_SIZE. Calculate to total number of @@ -994,32 +998,37 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, len += factor; } + pr_debug("Allocate %d lli:s for this transfer\n", len); data = coh901318_lli_alloc(&cohc->base->pool, len); if (data == NULL) goto err_dma_alloc; /* initiate allocated data list */ - cohd->pending_irqs = - coh901318_lli_fill_sg(&cohc->base->pool, data, sgl, sg_len, - cohc_dev_addr(cohc), - ctrl_chained, - ctrl, - ctrl_last, - direction, COH901318_CX_CTRL_TC_IRQ_ENABLE); - cohd->data = data; - - cohd->flags = flags; + ret = coh901318_lli_fill_sg(&cohc->base->pool, data, sgl, sg_len, + cohc_dev_addr(cohc), + ctrl_chained, + ctrl, + ctrl_last, + direction, COH901318_CX_CTRL_TC_IRQ_ENABLE); + if (ret) + goto err_lli_fill; COH_DBG(coh901318_list_print(cohc, data)); + /* Pick a descriptor to handle this transfer */ + cohd = coh901318_desc_get(cohc); + cohd->dir = direction; + cohd->flags = flags; + cohd->desc.tx_submit = coh901318_tx_submit; + cohd->data = data; + spin_unlock_irqrestore(&cohc->lock, flg); return &cohd->desc; + err_lli_fill: err_dma_alloc: err_direction: - coh901318_desc_remove(cohd); - coh901318_desc_free(cohc, cohd); spin_unlock_irqrestore(&cohc->lock, flg); out: return NULL; @@ -1092,9 +1101,8 @@ coh901318_terminate_all(struct dma_chan *chan) /* release the lli allocation*/ coh901318_lli_free(&cohc->base->pool, &cohd->data); - coh901318_desc_remove(cohd); - /* return desc to free-list */ + coh901318_desc_remove(cohd); coh901318_desc_free(cohc, cohd); } @@ -1102,16 +1110,14 @@ coh901318_terminate_all(struct dma_chan *chan) /* release the lli allocation*/ coh901318_lli_free(&cohc->base->pool, &cohd->data); - coh901318_desc_remove(cohd); - /* return desc to free-list */ + coh901318_desc_remove(cohd); coh901318_desc_free(cohc, cohd); } cohc->nbr_active_done = 0; cohc->busy = 0; - cohc->pending_irqs = 0; spin_unlock_irqrestore(&cohc->lock, flags); } @@ -1138,7 +1144,6 @@ void coh901318_base_init(struct dma_device *dma, const int *pick_chans, spin_lock_init(&cohc->lock); - cohc->pending_irqs = 0; cohc->nbr_active_done = 0; cohc->busy = 0; INIT_LIST_HEAD(&cohc->free); @@ -1254,12 +1259,17 @@ static int __init coh901318_probe(struct platform_device *pdev) base->dma_memcpy.device_issue_pending = coh901318_issue_pending; base->dma_memcpy.device_terminate_all = coh901318_terminate_all; base->dma_memcpy.dev = &pdev->dev; + /* + * This controller can only access address at even 32bit boundaries, + * i.e. 2^2 + */ + base->dma_memcpy.copy_align = 2; err = dma_async_device_register(&base->dma_memcpy); if (err) goto err_register_memcpy; - dev_dbg(&pdev->dev, "Initialized COH901318 DMA on virtual base 0x%08x\n", + dev_info(&pdev->dev, "Initialized COH901318 DMA on virtual base 0x%08x\n", (u32) base->virtbase); return err; |