[PATCH v4 1/3] dmaengine: vdma: Add config structure to differentiate dmas

From: Kedareswara rao Appana
Date: Fri Apr 22 2016 - 02:14:23 EST

This patch adds config structure in the driver to differentiate
AXI DMA's and to add more features(clock support etc..) to these DMA's.

Signed-off-by: Kedareswara rao Appana <appanad@xxxxxxxxxx>
---
Changes for v4:
---> None.
Changes for v3:
---> New patch.

drivers/dma/xilinx/xilinx_vdma.c | 83 ++++++++++++++++++++++++----------------
1 file changed, 51 insertions(+), 32 deletions(-)

diff --git a/drivers/dma/xilinx/xilinx_vdma.c b/drivers/dma/xilinx/xilinx_vdma.c
index 70caea6..255cdca 100644
--- a/drivers/dma/xilinx/xilinx_vdma.c
+++ b/drivers/dma/xilinx/xilinx_vdma.c
@@ -342,6 +342,10 @@ struct xilinx_dma_chan {
void (*start_transfer)(struct xilinx_dma_chan *chan);
};

+struct dma_config {
+ enum xdma_ip_type dmatype;
+};
+
/**
* struct xilinx_dma_device - DMA device structure
* @regs: I/O mapped base address
@@ -351,7 +355,7 @@ struct xilinx_dma_chan {
* @has_sg: Specifies whether Scatter-Gather is present or not
* @flush_on_fsync: Flush on frame sync
* @ext_addr: Indicates 64 bit addressing is supported by dma device
- * @dmatype: DMA ip type
+ * @dma_config: DMA config structure
*/
struct xilinx_dma_device {
void __iomem *regs;
@@ -361,7 +365,7 @@ struct xilinx_dma_device {
bool has_sg;
u32 flush_on_fsync;
bool ext_addr;
- enum xdma_ip_type dmatype;
+ const struct dma_config *dma_config;
};

/* Macros */
@@ -573,12 +577,12 @@ xilinx_dma_free_tx_descriptor(struct xilinx_dma_chan *chan,
if (!desc)
return;

- if (chan->xdev->dmatype == XDMA_TYPE_VDMA) {
+ if (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
list_for_each_entry_safe(segment, next, &desc->segments, node) {
list_del(&segment->node);
xilinx_vdma_free_tx_segment(chan, segment);
}
- } else if (chan->xdev->dmatype == XDMA_TYPE_CDMA) {
+ } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
list_for_each_entry_safe(cdma_segment, cdma_next,
&desc->segments, node) {
list_del(&cdma_segment->node);
@@ -641,7 +645,7 @@ static void xilinx_dma_free_chan_resources(struct dma_chan *dchan)
dev_dbg(chan->dev, "Free all channel resources.\n");

xilinx_dma_free_descriptors(chan);
- if (chan->xdev->dmatype == XDMA_TYPE_AXIDMA)
+ if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA)
xilinx_dma_free_tx_segment(chan, chan->seg_v);
dma_pool_destroy(chan->desc_pool);
chan->desc_pool = NULL;
@@ -711,13 +715,13 @@ static int xilinx_dma_alloc_chan_resources(struct dma_chan *dchan)
* We need the descriptor to be aligned to 64bytes
* for meeting Xilinx VDMA specification requirement.
*/
- if (chan->xdev->dmatype == XDMA_TYPE_AXIDMA) {
+ if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
chan->desc_pool = dma_pool_create("xilinx_dma_desc_pool",
chan->dev,
sizeof(struct xilinx_axidma_tx_segment),
__alignof__(struct xilinx_axidma_tx_segment),
0);
- } else if (chan->xdev->dmatype == XDMA_TYPE_CDMA) {
+ } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
chan->desc_pool = dma_pool_create("xilinx_cdma_desc_pool",
chan->dev,
sizeof(struct xilinx_cdma_tx_segment),
@@ -738,7 +742,7 @@ static int xilinx_dma_alloc_chan_resources(struct dma_chan *dchan)
return -ENOMEM;
}

- if (chan->xdev->dmatype == XDMA_TYPE_AXIDMA)
+ if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA)
/*
* For AXI DMA case after submitting a pending_list, keep
* an extra segment allocated so that the "next descriptor"
@@ -751,7 +755,7 @@ static int xilinx_dma_alloc_chan_resources(struct dma_chan *dchan)

dma_cookie_init(dchan);

- if (chan->xdev->dmatype == XDMA_TYPE_AXIDMA) {
+ if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
/* For AXI DMA resetting once channel will reset the
* other channel as well so enable the interrupts here.
*/
@@ -759,7 +763,7 @@ static int xilinx_dma_alloc_chan_resources(struct dma_chan *dchan)
XILINX_DMA_DMAXR_ALL_IRQ_MASK);
}

- if ((chan->xdev->dmatype == XDMA_TYPE_CDMA) && chan->has_sg)
+ if ((chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) && chan->has_sg)
dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
XILINX_CDMA_CR_SGMODE);

@@ -790,7 +794,7 @@ static enum dma_status xilinx_dma_tx_status(struct dma_chan *dchan,
if (ret == DMA_COMPLETE || !txstate)
return ret;

- if (chan->xdev->dmatype == XDMA_TYPE_AXIDMA) {
+ if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
spin_lock_irqsave(&chan->lock, flags);

desc = list_last_entry(&chan->active_list,
@@ -1332,12 +1336,12 @@ static void append_desc_queue(struct xilinx_dma_chan *chan,
*/
tail_desc = list_last_entry(&chan->pending_list,
struct xilinx_dma_tx_descriptor, node);
- if (chan->xdev->dmatype == XDMA_TYPE_VDMA) {
+ if (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
tail_segment = list_last_entry(&tail_desc->segments,
struct xilinx_vdma_tx_segment,
node);
tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
- } else if (chan->xdev->dmatype == XDMA_TYPE_CDMA) {
+ } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
cdma_tail_segment = list_last_entry(&tail_desc->segments,
struct xilinx_cdma_tx_segment,
node);
@@ -1357,8 +1361,8 @@ append:
list_add_tail(&desc->node, &chan->pending_list);
chan->desc_pendingcount++;

- if (chan->has_sg && (chan->xdev->dmatype == XDMA_TYPE_VDMA) &&
- unlikely(chan->desc_pendingcount > chan->num_frms)) {
+ if (chan->has_sg && (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA)
+ && unlikely(chan->desc_pendingcount > chan->num_frms)) {
dev_dbg(chan->dev, "desc pendingcount is too high\n");
chan->desc_pendingcount = chan->num_frms;
}
@@ -1811,7 +1815,7 @@ static int xilinx_dma_chan_probe(struct xilinx_dma_device *xdev,
chan->id = 0;

chan->ctrl_offset = XILINX_DMA_MM2S_CTRL_OFFSET;
- if (xdev->dmatype == XDMA_TYPE_VDMA) {
+ if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
chan->desc_offset = XILINX_VDMA_MM2S_DESC_OFFSET;

if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH ||
@@ -1824,7 +1828,7 @@ static int xilinx_dma_chan_probe(struct xilinx_dma_device *xdev,
chan->id = 1;

chan->ctrl_offset = XILINX_DMA_S2MM_CTRL_OFFSET;
- if (xdev->dmatype == XDMA_TYPE_VDMA) {
+ if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
chan->desc_offset = XILINX_VDMA_S2MM_DESC_OFFSET;

if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH ||
@@ -1845,9 +1849,9 @@ static int xilinx_dma_chan_probe(struct xilinx_dma_device *xdev,
return err;
}

- if (xdev->dmatype == XDMA_TYPE_AXIDMA)
+ if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA)
chan->start_transfer = xilinx_dma_start_transfer;
- else if (xdev->dmatype == XDMA_TYPE_CDMA)
+ else if (xdev->dma_config->dmatype == XDMA_TYPE_CDMA)
chan->start_transfer = xilinx_cdma_start_transfer;
else
chan->start_transfer = xilinx_vdma_start_transfer;
@@ -1894,13 +1898,22 @@ static struct dma_chan *of_dma_xilinx_xlate(struct of_phandle_args *dma_spec,
return dma_get_slave_channel(&xdev->chan[chan_id]->common);
}

+static const struct dma_config axidma_config = {
+ .dmatype = XDMA_TYPE_AXIDMA,
+};
+
+static const struct dma_config axicdma_config = {
+ .dmatype = XDMA_TYPE_CDMA,
+};
+
+static const struct dma_config axivdma_config = {
+ .dmatype = XDMA_TYPE_VDMA,
+};
+
static const struct of_device_id xilinx_dma_of_ids[] = {
- { .compatible = "xlnx,axi-dma-1.00.a",
- .data = (void *)XDMA_TYPE_AXIDMA },
- { .compatible = "xlnx,axi-cdma-1.00.a",
- .data = (void *)XDMA_TYPE_CDMA },
- { .compatible = "xlnx,axi-vdma-1.00.a",
- .data = (void *)XDMA_TYPE_VDMA },
+ { .compatible = "xlnx,axi-dma-1.00.a", .data = &axidma_config },
+ { .compatible = "xlnx,axi-cdma-1.00.a", .data = &axicdma_config },
+ { .compatible = "xlnx,axi-vdma-1.00.a", .data = &axivdma_config },
{}
};
MODULE_DEVICE_TABLE(of, xilinx_dma_of_ids);
@@ -1915,7 +1928,7 @@ static int xilinx_dma_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct xilinx_dma_device *xdev;
- struct device_node *child;
+ struct device_node *child, *np = pdev->dev.of_node;
struct resource *io;
u32 num_frames, addr_width;
int i, err;
@@ -1926,7 +1939,13 @@ static int xilinx_dma_probe(struct platform_device *pdev)
return -ENOMEM;

xdev->dev = &pdev->dev;
- xdev->dmatype = (enum xdma_ip_type)of_device_get_match_data(&pdev->dev);
+ if (np) {
+ const struct of_device_id *match;
+
+ match = of_match_node(xilinx_dma_of_ids, np);
+ if (match && match->data)
+ xdev->dma_config = match->data;
+ }

/* Request and map I/O memory */
io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -1937,7 +1956,7 @@ static int xilinx_dma_probe(struct platform_device *pdev)
/* Retrieve the DMA engine properties from the device tree */
xdev->has_sg = of_property_read_bool(node, "xlnx,include-sg");

- if (xdev->dmatype == XDMA_TYPE_VDMA) {
+ if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
err = of_property_read_u32(node, "xlnx,num-fstores",
&num_frames);
if (err < 0) {
@@ -1969,7 +1988,7 @@ static int xilinx_dma_probe(struct platform_device *pdev)
xdev->common.dev = &pdev->dev;

INIT_LIST_HEAD(&xdev->common.channels);
- if (!(xdev->dmatype == XDMA_TYPE_CDMA)) {
+ if (!(xdev->dma_config->dmatype == XDMA_TYPE_CDMA)) {
dma_cap_set(DMA_SLAVE, xdev->common.cap_mask);
dma_cap_set(DMA_PRIVATE, xdev->common.cap_mask);
}
@@ -1981,12 +2000,12 @@ static int xilinx_dma_probe(struct platform_device *pdev)
xdev->common.device_terminate_all = xilinx_dma_terminate_all;
xdev->common.device_tx_status = xilinx_dma_tx_status;
xdev->common.device_issue_pending = xilinx_dma_issue_pending;
- if (xdev->dmatype == XDMA_TYPE_AXIDMA) {
+ if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
xdev->common.device_prep_slave_sg = xilinx_dma_prep_slave_sg;
/* Residue calculation is supported by only AXI DMA */
xdev->common.residue_granularity =
DMA_RESIDUE_GRANULARITY_SEGMENT;
- } else if (xdev->dmatype == XDMA_TYPE_CDMA) {
+ } else if (xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
dma_cap_set(DMA_MEMCPY, xdev->common.cap_mask);
xdev->common.device_prep_dma_memcpy = xilinx_cdma_prep_memcpy;
} else {
@@ -2003,7 +2022,7 @@ static int xilinx_dma_probe(struct platform_device *pdev)
goto error;
}

- if (xdev->dmatype == XDMA_TYPE_VDMA) {
+ if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
for (i = 0; i < XILINX_DMA_MAX_CHANS_PER_DEVICE; i++)
if (xdev->chan[i])
xdev->chan[i]->num_frms = num_frames;
--
2.1.2