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(+) (limited to 'drivers/dma') 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(-) (limited to 'drivers/dma') 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(-) (limited to 'drivers/dma') 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(-) (limited to 'drivers/dma') 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(-) (limited to 'drivers/dma') 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