From b9b3f82f94b52ebb0bbdf6cd77ccc5e8ee3f53b5 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Wed, 12 Jan 2011 12:12:31 +0100 Subject: dmaengine i.MX sdma: set maximum segment size for our device Signed-off-by: Sascha Hauer --- drivers/dma/imx-sdma.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index d5a5d4d9c19b..c50305043f15 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -301,6 +301,7 @@ struct sdma_firmware_header { struct sdma_engine { struct device *dev; + struct device_dma_parameters dma_parms; struct sdma_channel channel[MAX_DMA_CHANNELS]; struct sdma_channel_control *channel_control; void __iomem *regs; @@ -1317,6 +1318,8 @@ static int __init sdma_probe(struct platform_device *pdev) sdma->dma_device.device_prep_dma_cyclic = sdma_prep_dma_cyclic; sdma->dma_device.device_control = sdma_control; sdma->dma_device.device_issue_pending = sdma_issue_pending; + sdma->dma_device.dev->dma_parms = &sdma->dma_parms; + dma_set_max_seg_size(sdma->dma_device.dev, 65535); ret = dma_async_device_register(&sdma->dma_device); if (ret) { -- cgit v1.2.3 From 1fa81c270da4d8dffa84fcca448654a10ed0a5dc Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Wed, 12 Jan 2011 13:02:28 +0100 Subject: dmaengine i.MX sdma: check sg entries for valid addresses and lengths This patch lets sdma_prep_slave_sg fail if the entries of an sg list do not start on multiples of the word size or if the lengths are not multiple of the word size. Also, catch the previously unhandled DMA_SLAVE_BUSWIDTH_8_BYTES and DMA_SLAVE_BUSWIDTH_UNDEFINED cases. Signed-off-by: Sascha Hauer --- drivers/dma/imx-sdma.c | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index c50305043f15..8707723e36da 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -925,10 +925,24 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg( ret = -EINVAL; goto err_out; } - if (sdmac->word_size == DMA_SLAVE_BUSWIDTH_4_BYTES) + + switch (sdmac->word_size) { + case DMA_SLAVE_BUSWIDTH_4_BYTES: bd->mode.command = 0; - else - bd->mode.command = sdmac->word_size; + if (count & 3 || sg->dma_address & 3) + return NULL; + break; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + bd->mode.command = 2; + if (count & 1 || sg->dma_address & 1) + return NULL; + break; + case DMA_SLAVE_BUSWIDTH_1_BYTE: + bd->mode.command = 1; + break; + default: + return NULL; + } param = BD_DONE | BD_EXTD | BD_CONT; -- cgit v1.2.3 From 7a0e9b2557902bdca563a5eb1bbac87560bd7d20 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Mon, 31 Jan 2011 10:19:53 +0100 Subject: dmaengine i.MX SDMA: do not initialize chan_id field This is bogus as the dmaengine core will overwrite this field. Signed-off-by: Sascha Hauer --- drivers/dma/imx-sdma.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 8707723e36da..3e848ee9a18a 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -1307,7 +1307,6 @@ static int __init sdma_probe(struct platform_device *pdev) dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask); sdmac->chan.device = &sdma->dma_device; - sdmac->chan.chan_id = i; sdmac->channel = i; /* Add the channel to the DMAC list */ -- cgit v1.2.3 From 7214a8b14f63a1603401124bc150e17b145aa476 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Mon, 31 Jan 2011 10:21:35 +0100 Subject: dmaengine i.MX SDMA: initialize dma capabilities outside channel loop The capabilities are device specific fields, not channel specific fields. Signed-off-by: Sascha Hauer --- drivers/dma/imx-sdma.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 3e848ee9a18a..eb250681804b 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -1295,6 +1295,9 @@ static int __init sdma_probe(struct platform_device *pdev) sdma->version = pdata->sdma_version; + dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask); + dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask); + INIT_LIST_HEAD(&sdma->dma_device.channels); /* Initialize channel parameters */ for (i = 0; i < MAX_DMA_CHANNELS; i++) { @@ -1303,9 +1306,6 @@ static int __init sdma_probe(struct platform_device *pdev) sdmac->sdma = sdma; spin_lock_init(&sdmac->lock); - dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask); - dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask); - sdmac->chan.device = &sdma->dma_device; sdmac->channel = i; -- cgit v1.2.3 From 23889c6352ab4a842a30221bb412ff49954b2fb3 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Mon, 31 Jan 2011 10:56:58 +0100 Subject: dmaengine i.MX SDMA: reserve channel 0 by not registering it We need channel 0 of the sdma engine for internal purposes. We accomplished this by calling dma_request_channel() in the probe function. This does not work when multiple dma engines are present which is the case when IPU support for i.MX31/35 is compiled in. So instead of registering channel 0 and reserving it afterwards simply do not register it in the first place. With this the dmaengine channel counting does not match sdma channel counting anymore, so we have to use sdma channel counting in the driver. Signed-off-by: Sascha Hauer --- drivers/dma/imx-sdma.c | 30 ++++++++++++------------------ 1 file changed, 12 insertions(+), 18 deletions(-) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index eb250681804b..1eb3f0077403 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -230,7 +230,7 @@ struct sdma_engine; * struct sdma_channel - housekeeping for a SDMA channel * * @sdma pointer to the SDMA engine for this channel - * @channel the channel number, matches dmaengine chan_id + * @channel the channel number, matches dmaengine chan_id + 1 * @direction transfer type. Needed for setting SDMA script * @peripheral_type Peripheral type. Needed for setting SDMA script * @event_id0 aka dma request line @@ -799,7 +799,7 @@ static dma_cookie_t sdma_tx_submit(struct dma_async_tx_descriptor *tx) cookie = sdma_assign_cookie(sdmac); - sdma_enable_channel(sdma, tx->chan->chan_id); + sdma_enable_channel(sdma, sdmac->channel); spin_unlock_irq(&sdmac->lock); @@ -812,10 +812,6 @@ static int sdma_alloc_chan_resources(struct dma_chan *chan) struct imx_dma_data *data = chan->private; int prio, ret; - /* No need to execute this for internal channel 0 */ - if (chan->chan_id == 0) - return 0; - if (!data) return -EINVAL; @@ -880,7 +876,7 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg( struct sdma_channel *sdmac = to_sdma_chan(chan); struct sdma_engine *sdma = sdmac->sdma; int ret, i, count; - int channel = chan->chan_id; + int channel = sdmac->channel; struct scatterlist *sg; if (sdmac->status == DMA_IN_PROGRESS) @@ -978,7 +974,7 @@ static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic( struct sdma_channel *sdmac = to_sdma_chan(chan); struct sdma_engine *sdma = sdmac->sdma; int num_periods = buf_len / period_len; - int channel = chan->chan_id; + int channel = sdmac->channel; int ret, i = 0, buf = 0; dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel); @@ -1252,7 +1248,6 @@ static int __init sdma_probe(struct platform_device *pdev) struct resource *iores; struct sdma_platform_data *pdata = pdev->dev.platform_data; int i; - dma_cap_mask_t mask; struct sdma_engine *sdma; sdma = kzalloc(sizeof(*sdma), GFP_KERNEL); @@ -1309,8 +1304,14 @@ static int __init sdma_probe(struct platform_device *pdev) sdmac->chan.device = &sdma->dma_device; sdmac->channel = i; - /* Add the channel to the DMAC list */ - list_add_tail(&sdmac->chan.device_node, &sdma->dma_device.channels); + /* + * Add the channel to the DMAC list. Do not add channel 0 though + * because we need it internally in the SDMA driver. This also means + * that channel 0 in dmaengine counting matches sdma channel 1. + */ + if (i) + list_add_tail(&sdmac->chan.device_node, + &sdma->dma_device.channels); } ret = sdma_init(sdma); @@ -1340,13 +1341,6 @@ static int __init sdma_probe(struct platform_device *pdev) goto err_init; } - /* request channel 0. This is an internal control channel - * to the SDMA engine and not available to clients. - */ - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - dma_request_channel(mask, NULL, NULL); - dev_info(sdma->dev, "initialized\n"); return 0; -- cgit v1.2.3 From 1e070a60997f5bbaadd498c34380e2aa110336cf Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Wed, 12 Jan 2011 13:14:37 +0100 Subject: dmaengine i.MX dma: set maximum segment size for our device Signed-off-by: Sascha Hauer --- drivers/dma/imx-dma.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c index e53d438142bb..a46e1d9fa3e4 100644 --- a/drivers/dma/imx-dma.c +++ b/drivers/dma/imx-dma.c @@ -49,6 +49,7 @@ struct imxdma_channel { struct imxdma_engine { struct device *dev; + struct device_dma_parameters dma_parms; struct dma_device dma_device; struct imxdma_channel channel[MAX_DMA_CHANNELS]; }; @@ -370,6 +371,9 @@ static int __init imxdma_probe(struct platform_device *pdev) platform_set_drvdata(pdev, imxdma); + imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms; + dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff); + ret = dma_async_device_register(&imxdma->dma_device); if (ret) { dev_err(&pdev->dev, "unable to register\n"); -- cgit v1.2.3 From d07102a1bb0e759ce4571df30c62998ef5d8a8d3 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Wed, 12 Jan 2011 14:13:23 +0100 Subject: dmaengine i.MX dma: check sg entries for valid addresses and lengths Signed-off-by: Sascha Hauer --- drivers/dma/imx-dma.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c index a46e1d9fa3e4..a1eac99a5fa1 100644 --- a/drivers/dma/imx-dma.c +++ b/drivers/dma/imx-dma.c @@ -243,6 +243,21 @@ static struct dma_async_tx_descriptor *imxdma_prep_slave_sg( else dmamode = DMA_MODE_WRITE; + switch (imxdmac->word_size) { + case DMA_SLAVE_BUSWIDTH_4_BYTES: + if (sgl->length & 3 || sgl->dma_address & 3) + return NULL; + break; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + if (sgl->length & 1 || sgl->dma_address & 1) + return NULL; + break; + case DMA_SLAVE_BUSWIDTH_1_BYTE: + break; + default: + return NULL; + } + ret = imx_dma_setup_sg(imxdmac->imxdma_channel, sgl, sg_len, dma_length, imxdmac->per_address, dmamode); if (ret) -- cgit v1.2.3 From 97a43dfe84119528ec2576129b91d619219ab716 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Mon, 31 Jan 2011 11:35:44 +0100 Subject: dmaengine i.MX DMA: do not initialize chan_id field Signed-off-by: Sascha Hauer --- drivers/dma/imx-dma.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c index a1eac99a5fa1..82627087b550 100644 --- a/drivers/dma/imx-dma.c +++ b/drivers/dma/imx-dma.c @@ -366,7 +366,6 @@ static int __init imxdma_probe(struct platform_device *pdev) dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask); imxdmac->chan.device = &imxdma->dma_device; - imxdmac->chan.chan_id = i; imxdmac->channel = i; /* Add the channel to the DMAC list */ -- cgit v1.2.3 From f8a356ff96a9070156f863e4f7716e2a0eb8c995 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Mon, 31 Jan 2011 11:35:59 +0100 Subject: dmaengine i.MX dma: initialize dma capabilities outside channel loop The capabilities are device specific fields, not channel specific fields. Signed-off-by: Sascha Hauer --- drivers/dma/imx-dma.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c index 82627087b550..e18eaabe92b9 100644 --- a/drivers/dma/imx-dma.c +++ b/drivers/dma/imx-dma.c @@ -345,6 +345,9 @@ static int __init imxdma_probe(struct platform_device *pdev) INIT_LIST_HEAD(&imxdma->dma_device.channels); + dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask); + dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask); + /* Initialize channel parameters */ for (i = 0; i < MAX_DMA_CHANNELS; i++) { struct imxdma_channel *imxdmac = &imxdma->channel[i]; @@ -362,9 +365,6 @@ static int __init imxdma_probe(struct platform_device *pdev) imxdmac->imxdma = imxdma; spin_lock_init(&imxdmac->lock); - dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask); - dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask); - imxdmac->chan.device = &imxdma->dma_device; imxdmac->channel = i; -- cgit v1.2.3 From 1797c33f0edcdcc9a483c06233a203786666a97f Mon Sep 17 00:00:00 2001 From: Shawn Guo Date: Thu, 20 Jan 2011 05:50:35 +0800 Subject: dmaengine: imx-sdma: remove IMX_DMA_SG_LOOP handling in sdma_prep_slave_sg() This is a leftover from the time that the driver did not have sdma_prep_dma_cyclic callback and implemented sound dma as a looped sg chain. And it can be removed now. Signed-off-by: Shawn Guo Signed-off-by: Sascha Hauer --- drivers/dma/imx-sdma.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index d5a5d4d9c19b..cf8cc0b8e7f7 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -931,12 +931,6 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg( param = BD_DONE | BD_EXTD | BD_CONT; - if (sdmac->flags & IMX_DMA_SG_LOOP) { - param |= BD_INTR; - if (i + 1 == sg_len) - param |= BD_WRAP; - } - if (i + 1 == sg_len) param |= BD_INTR; -- cgit v1.2.3 From 4b2ce9ddb370c4eb573540611c347d78ac4b54a0 Mon Sep 17 00:00:00 2001 From: Shawn Guo Date: Thu, 20 Jan 2011 05:50:36 +0800 Subject: dmaengine: imx-sdma: set sdmac->status to DMA_ERROR in err_out of sdma_prep_slave_sg() sdma_prep_dma_cyclic() sets sdmac->status to DMA_ERROR in err_out, and sdma_prep_slave_sg() needs to do the same. Otherwise, sdmac->status stays at DMA_IN_PROGRESS, which will make the function return immediately next time it gets called. Signed-off-by: Shawn Guo Signed-off-by: Sascha Hauer --- drivers/dma/imx-sdma.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index cf8cc0b8e7f7..6fc04d85be6b 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -947,6 +947,7 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg( return &sdmac->desc; err_out: + sdmac->status = DMA_ERROR; return NULL; } -- cgit v1.2.3 From 8a9659114c7be6f88253618252881ea6fe0588b4 Mon Sep 17 00:00:00 2001 From: Shawn Guo Date: Thu, 20 Jan 2011 05:50:37 +0800 Subject: dmaengine: imx-sdma: return sdmac->status in sdma_tx_status() The sdmac->status was designed to reflect the status of the tx, so simply return it in sdma_tx_status(). Then dma client can call dma_async_is_tx_complete() to know the status of the tx. Signed-off-by: Shawn Guo Signed-off-by: Sascha Hauer --- drivers/dma/imx-sdma.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 6fc04d85be6b..f331ae0f7ec3 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -1061,14 +1061,12 @@ static enum dma_status sdma_tx_status(struct dma_chan *chan, { struct sdma_channel *sdmac = to_sdma_chan(chan); dma_cookie_t last_used; - enum dma_status ret; last_used = chan->cookie; - ret = dma_async_is_complete(cookie, sdmac->last_completed, last_used); dma_set_tx_state(txstate, sdmac->last_completed, last_used, 0); - return ret; + return sdmac->status; } static void sdma_issue_pending(struct dma_chan *chan) -- cgit v1.2.3 From 1e9cebb42de57f1243261939c77ab5b0f9bcf311 Mon Sep 17 00:00:00 2001 From: Shawn Guo Date: Thu, 20 Jan 2011 05:50:38 +0800 Subject: dmaengine: imx-sdma: correct sdmac->status in sdma_handle_channel_loop() sdma_handle_channel_loop() is the handler of cyclic tx. One period success does not really mean the success of the tx. Instead of DMA_SUCCESS, DMA_IN_PROGRESS should be the one to tell. Signed-off-by: Shawn Guo Signed-off-by: Sascha Hauer --- drivers/dma/imx-sdma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index f331ae0f7ec3..cf93d1737f1e 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -449,7 +449,7 @@ static void sdma_handle_channel_loop(struct sdma_channel *sdmac) if (bd->mode.status & BD_RROR) sdmac->status = DMA_ERROR; else - sdmac->status = DMA_SUCCESS; + sdmac->status = DMA_IN_PROGRESS; bd->mode.status |= BD_DONE; sdmac->buf_tail++; -- cgit v1.2.3 From 341b9419a8c0a4cdb75773c576870f1eb655516d Mon Sep 17 00:00:00 2001 From: Shawn Guo Date: Thu, 20 Jan 2011 05:50:39 +0800 Subject: dmaengine: imx-sdma: fix up param for the last BD in sdma_prep_slave_sg() As per the reference manual, bit "L" should be set while bit "C" should be cleared for the last buffer descriptor in the non-cyclic chain, so that sdma can stop trying to find the next BD and end the transfer. In case of sdma_prep_slave_sg(), BD_LAST needs to be set and BD_CONT be cleared for the last BD. Signed-off-by: Shawn Guo Signed-off-by: Sascha Hauer --- drivers/dma/imx-sdma.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index cf93d1737f1e..4535f98b3553 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -931,8 +931,11 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg( param = BD_DONE | BD_EXTD | BD_CONT; - if (i + 1 == sg_len) + if (i + 1 == sg_len) { param |= BD_INTR; + param |= BD_LAST; + param &= ~BD_CONT; + } dev_dbg(sdma->dev, "entry %d: count: %d dma: 0x%08x %s%s\n", i, count, sg->dma_address, -- cgit v1.2.3