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dmaengine: vdma: Add Support for Xilinx AXI Direct Memory Access Engine

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This patch adds support for the AXI Direct Memory Access (AXI DMA)
core in the existing vdma driver, AXI DMA Core is a
soft Xilinx IP core that provides high-bandwidth
direct memory access between memory and AXI4-Stream
type target peripherals.

Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Kedareswara rao Appana 2016-04-07 10:59:43 +05:30 committed by Vinod Koul
parent 7e4cda70c0
commit c0bba3a99f
2 changed files with 444 additions and 42 deletions
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474
drivers/dma/xilinx/xilinx_vdma.c
View File

@ -16,6 +16,11 @@
* video device (S2MM). Initialization, status, interrupt and management
* registers are accessed through an AXI4-Lite slave interface.
*
* The AXI Direct Memory Access (AXI DMA) core is a soft Xilinx IP core that
* provides high-bandwidth one dimensional direct memory access between memory
* and AXI4-Stream target peripherals. It supports one receive and one
* transmit channel, both of them optional at synthesis time.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
@ -140,6 +145,19 @@
/* Delay loop counter to prevent hardware failure */
#define XILINX_DMA_LOOP_COUNT 1000000
/* AXI DMA Specific Registers/Offsets */
#define XILINX_DMA_REG_SRCDSTADDR 0x18
#define XILINX_DMA_REG_BTT 0x28
/* AXI DMA Specific Masks/Bit fields */
#define XILINX_DMA_MAX_TRANS_LEN GENMASK(22, 0)
#define XILINX_DMA_CR_COALESCE_MAX GENMASK(23, 16)
#define XILINX_DMA_CR_COALESCE_SHIFT 16
#define XILINX_DMA_BD_SOP BIT(27)
#define XILINX_DMA_BD_EOP BIT(26)
#define XILINX_DMA_COALESCE_MAX 255
#define XILINX_DMA_NUM_APP_WORDS 5
/**
* struct xilinx_vdma_desc_hw - Hardware Descriptor
* @next_desc: Next Descriptor Pointer @0x00
@ -161,6 +179,30 @@ struct xilinx_vdma_desc_hw {
u32 stride;
} __aligned(64);
/**
* struct xilinx_axidma_desc_hw - Hardware Descriptor for AXI DMA
* @next_desc: Next Descriptor Pointer @0x00
* @pad1: Reserved @0x04
* @buf_addr: Buffer address @0x08
* @pad2: Reserved @0x0C
* @pad3: Reserved @0x10
* @pad4: Reserved @0x14
* @control: Control field @0x18
* @status: Status field @0x1C
* @app: APP Fields @0x20 - 0x30
*/
struct xilinx_axidma_desc_hw {
u32 next_desc;
u32 pad1;
u32 buf_addr;
u32 pad2;
u32 pad3;
u32 pad4;
u32 control;
u32 status;
u32 app[XILINX_DMA_NUM_APP_WORDS];
} __aligned(64);
/**
* struct xilinx_vdma_tx_segment - Descriptor segment
* @hw: Hardware descriptor
@ -173,6 +215,18 @@ struct xilinx_vdma_tx_segment {
dma_addr_t phys;
} __aligned(64);
/**
* struct xilinx_axidma_tx_segment - Descriptor segment
* @hw: Hardware descriptor
* @node: Node in the descriptor segments list
* @phys: Physical address of segment
*/
struct xilinx_axidma_tx_segment {
struct xilinx_axidma_desc_hw hw;
struct list_head node;
dma_addr_t phys;
} __aligned(64);
/**
* struct xilinx_dma_tx_descriptor - Per Transaction structure
* @async_tx: Async transaction descriptor
@ -210,6 +264,9 @@ struct xilinx_dma_tx_descriptor {
* @desc_pendingcount: Descriptor pending count
* @ext_addr: Indicates 64 bit addressing is supported by dma channel
* @desc_submitcount: Descriptor h/w submitted count
* @residue: Residue for AXI DMA
* @seg_v: Statically allocated segments base
* @start_transfer: Differentiate b/w DMA IP's transfer
*/
struct xilinx_dma_chan {
struct xilinx_dma_device *xdev;
@ -235,6 +292,9 @@ struct xilinx_dma_chan {
u32 desc_pendingcount;
bool ext_addr;
u32 desc_submitcount;
u32 residue;
struct xilinx_axidma_tx_segment *seg_v;
void (*start_transfer)(struct xilinx_dma_chan *chan);
};
/**
@ -246,6 +306,7 @@ 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
*/
struct xilinx_dma_device {
void __iomem *regs;
@ -255,6 +316,7 @@ struct xilinx_dma_device {
bool has_sg;
u32 flush_on_fsync;
bool ext_addr;
enum xdma_ip_type dmatype;
};
/* Macros */
@ -352,6 +414,39 @@ xilinx_vdma_alloc_tx_segment(struct xilinx_dma_chan *chan)
return segment;
}
/**
* xilinx_axidma_alloc_tx_segment - Allocate transaction segment
* @chan: Driver specific DMA channel
*
* Return: The allocated segment on success and NULL on failure.
*/
static struct xilinx_axidma_tx_segment *
xilinx_axidma_alloc_tx_segment(struct xilinx_dma_chan *chan)
{
struct xilinx_axidma_tx_segment *segment;
dma_addr_t phys;
segment = dma_pool_alloc(chan->desc_pool, GFP_ATOMIC, &phys);
if (!segment)
return NULL;
memset(segment, 0, sizeof(*segment));
segment->phys = phys;
return segment;
}
/**
* xilinx_dma_free_tx_segment - Free transaction segment
* @chan: Driver specific DMA channel
* @segment: DMA transaction segment
*/
static void xilinx_dma_free_tx_segment(struct xilinx_dma_chan *chan,
struct xilinx_axidma_tx_segment *segment)
{
dma_pool_free(chan->desc_pool, segment, segment->phys);
}
/**
* xilinx_vdma_free_tx_segment - Free transaction segment
* @chan: Driver specific DMA channel
@ -393,13 +488,22 @@ xilinx_dma_free_tx_descriptor(struct xilinx_dma_chan *chan,
struct xilinx_dma_tx_descriptor *desc)
{
struct xilinx_vdma_tx_segment *segment, *next;
struct xilinx_axidma_tx_segment *axidma_segment, *axidma_next;
if (!desc)
return;
list_for_each_entry_safe(segment, next, &desc->segments, node) {
list_del(&segment->node);
xilinx_vdma_free_tx_segment(chan, segment);
if (chan->xdev->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 {
list_for_each_entry_safe(axidma_segment, axidma_next,
&desc->segments, node) {
list_del(&axidma_segment->node);
xilinx_dma_free_tx_segment(chan, axidma_segment);
}
}
kfree(desc);
@ -451,6 +555,8 @@ 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)
xilinx_dma_free_tx_segment(chan, chan->seg_v);
dma_pool_destroy(chan->desc_pool);
chan->desc_pool = NULL;
}
@ -519,10 +625,20 @@ 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.
*/
chan->desc_pool = dma_pool_create("xilinx_vdma_desc_pool",
chan->dev,
sizeof(struct xilinx_vdma_tx_segment),
__alignof__(struct xilinx_vdma_tx_segment), 0);
if (chan->xdev->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 {
chan->desc_pool = dma_pool_create("xilinx_vdma_desc_pool",
chan->dev,
sizeof(struct xilinx_vdma_tx_segment),
__alignof__(struct xilinx_vdma_tx_segment),
0);
}
if (!chan->desc_pool) {
dev_err(chan->dev,
"unable to allocate channel %d descriptor pool\n",
@ -530,7 +646,27 @@ static int xilinx_dma_alloc_chan_resources(struct dma_chan *dchan)
return -ENOMEM;
}
if (chan->xdev->dmatype == XDMA_TYPE_AXIDMA)
/*
* For AXI DMA case after submitting a pending_list, keep
* an extra segment allocated so that the "next descriptor"
* pointer on the tail descriptor always points to a
* valid descriptor, even when paused after reaching taildesc.
* This way, it is possible to issue additional
* transfers without halting and restarting the channel.
*/
chan->seg_v = xilinx_axidma_alloc_tx_segment(chan);
dma_cookie_init(dchan);
if (chan->xdev->dmatype == XDMA_TYPE_AXIDMA) {
/* For AXI DMA resetting once channel will reset the
* other channel as well so enable the interrupts here.
*/
dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
XILINX_DMA_DMAXR_ALL_IRQ_MASK);
}
return 0;
}
@ -546,7 +682,37 @@ static enum dma_status xilinx_dma_tx_status(struct dma_chan *dchan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
return dma_cookie_status(dchan, cookie, txstate);
struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
struct xilinx_dma_tx_descriptor *desc;
struct xilinx_axidma_tx_segment *segment;
struct xilinx_axidma_desc_hw *hw;
enum dma_status ret;
unsigned long flags;
u32 residue = 0;
ret = dma_cookie_status(dchan, cookie, txstate);
if (ret == DMA_COMPLETE || !txstate)
return ret;
if (chan->xdev->dmatype == XDMA_TYPE_AXIDMA) {
spin_lock_irqsave(&chan->lock, flags);
desc = list_last_entry(&chan->active_list,
struct xilinx_dma_tx_descriptor, node);
if (chan->has_sg) {
list_for_each_entry(segment, &desc->segments, node) {
hw = &segment->hw;
residue += (hw->control - hw->status) &
XILINX_DMA_MAX_TRANS_LEN;
}
}
spin_unlock_irqrestore(&chan->lock, flags);
chan->residue = residue;
dma_set_residue(txstate, chan->residue);
}
return ret;
}
/**
@ -753,6 +919,91 @@ static void xilinx_vdma_start_transfer(struct xilinx_dma_chan *chan)
}
}
/**
* xilinx_dma_start_transfer - Starts DMA transfer
* @chan: Driver specific channel struct pointer
*/
static void xilinx_dma_start_transfer(struct xilinx_dma_chan *chan)
{
struct xilinx_dma_tx_descriptor *head_desc, *tail_desc;
struct xilinx_axidma_tx_segment *tail_segment, *old_head, *new_head;
u32 reg;
if (chan->err)
return;
if (list_empty(&chan->pending_list))
return;
/* If it is SG mode and hardware is busy, cannot submit */
if (chan->has_sg && xilinx_dma_is_running(chan) &&
!xilinx_dma_is_idle(chan)) {
dev_dbg(chan->dev, "DMA controller still busy\n");
return;
}
head_desc = list_first_entry(&chan->pending_list,
struct xilinx_dma_tx_descriptor, node);
tail_desc = list_last_entry(&chan->pending_list,
struct xilinx_dma_tx_descriptor, node);
tail_segment = list_last_entry(&tail_desc->segments,
struct xilinx_axidma_tx_segment, node);
old_head = list_first_entry(&head_desc->segments,
struct xilinx_axidma_tx_segment, node);
new_head = chan->seg_v;
/* Copy Buffer Descriptor fields. */
new_head->hw = old_head->hw;
/* Swap and save new reserve */
list_replace_init(&old_head->node, &new_head->node);
chan->seg_v = old_head;
tail_segment->hw.next_desc = chan->seg_v->phys;
head_desc->async_tx.phys = new_head->phys;
reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
if (chan->desc_pendingcount <= XILINX_DMA_COALESCE_MAX) {
reg &= ~XILINX_DMA_CR_COALESCE_MAX;
reg |= chan->desc_pendingcount <<
XILINX_DMA_CR_COALESCE_SHIFT;
dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
}
if (chan->has_sg)
dma_ctrl_write(chan, XILINX_DMA_REG_CURDESC,
head_desc->async_tx.phys);
xilinx_dma_start(chan);
if (chan->err)
return;
/* Start the transfer */
if (chan->has_sg) {
dma_ctrl_write(chan, XILINX_DMA_REG_TAILDESC,
tail_segment->phys);
} else {
struct xilinx_axidma_tx_segment *segment;
struct xilinx_axidma_desc_hw *hw;
segment = list_first_entry(&head_desc->segments,
struct xilinx_axidma_tx_segment,
node);
hw = &segment->hw;
dma_ctrl_write(chan, XILINX_DMA_REG_SRCDSTADDR, hw->buf_addr);
/* Start the transfer */
dma_ctrl_write(chan, XILINX_DMA_REG_BTT,
hw->control & XILINX_DMA_MAX_TRANS_LEN);
}
list_splice_tail_init(&chan->pending_list, &chan->active_list);
chan->desc_pendingcount = 0;
}
/**
* xilinx_dma_issue_pending - Issue pending transactions
* @dchan: DMA channel
@ -763,7 +1014,7 @@ static void xilinx_dma_issue_pending(struct dma_chan *dchan)
unsigned long flags;
spin_lock_irqsave(&chan->lock, flags);
xilinx_vdma_start_transfer(chan);
chan->start_transfer(chan);
spin_unlock_irqrestore(&chan->lock, flags);
}
@ -895,7 +1146,7 @@ static irqreturn_t xilinx_dma_irq_handler(int irq, void *data)
if (status & XILINX_DMA_DMASR_FRM_CNT_IRQ) {
spin_lock(&chan->lock);
xilinx_dma_complete_descriptor(chan);
xilinx_vdma_start_transfer(chan);
chan->start_transfer(chan);
spin_unlock(&chan->lock);
}
@ -913,6 +1164,7 @@ static void append_desc_queue(struct xilinx_dma_chan *chan,
{
struct xilinx_vdma_tx_segment *tail_segment;
struct xilinx_dma_tx_descriptor *tail_desc;
struct xilinx_axidma_tx_segment *axidma_tail_segment;
if (list_empty(&chan->pending_list))
goto append;
@ -923,9 +1175,17 @@ static void append_desc_queue(struct xilinx_dma_chan *chan,
*/
tail_desc = list_last_entry(&chan->pending_list,
struct xilinx_dma_tx_descriptor, node);
tail_segment = list_last_entry(&tail_desc->segments,
struct xilinx_vdma_tx_segment, node);
tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
if (chan->xdev->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 {
axidma_tail_segment = list_last_entry(&tail_desc->segments,
struct xilinx_axidma_tx_segment,
node);
axidma_tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
}
/*
* Add the software descriptor and all children to the list
@ -935,7 +1195,7 @@ append:
list_add_tail(&desc->node, &chan->pending_list);
chan->desc_pendingcount++;
if (chan->has_sg &&
if (chan->has_sg && (chan->xdev->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;
@ -1062,6 +1322,109 @@ error:
return NULL;
}
/**
* xilinx_dma_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction
* @dchan: DMA channel
* @sgl: scatterlist to transfer to/from
* @sg_len: number of entries in @scatterlist
* @direction: DMA direction
* @flags: transfer ack flags
* @context: APP words of the descriptor
*
* Return: Async transaction descriptor on success and NULL on failure
*/
static struct dma_async_tx_descriptor *xilinx_dma_prep_slave_sg(
struct dma_chan *dchan, struct scatterlist *sgl, unsigned int sg_len,
enum dma_transfer_direction direction, unsigned long flags,
void *context)
{
struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
struct xilinx_dma_tx_descriptor *desc;
struct xilinx_axidma_tx_segment *segment = NULL, *prev = NULL;
u32 *app_w = (u32 *)context;
struct scatterlist *sg;
size_t copy;
size_t sg_used;
unsigned int i;
if (!is_slave_direction(direction))
return NULL;
/* Allocate a transaction descriptor. */
desc = xilinx_dma_alloc_tx_descriptor(chan);
if (!desc)
return NULL;
dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
desc->async_tx.tx_submit = xilinx_dma_tx_submit;
/* Build transactions using information in the scatter gather list */
for_each_sg(sgl, sg, sg_len, i) {
sg_used = 0;
/* Loop until the entire scatterlist entry is used */
while (sg_used < sg_dma_len(sg)) {
struct xilinx_axidma_desc_hw *hw;
/* Get a free segment */
segment = xilinx_axidma_alloc_tx_segment(chan);
if (!segment)
goto error;
/*
* Calculate the maximum number of bytes to transfer,
* making sure it is less than the hw limit
*/
copy = min_t(size_t, sg_dma_len(sg) - sg_used,
XILINX_DMA_MAX_TRANS_LEN);
hw = &segment->hw;
/* Fill in the descriptor */
hw->buf_addr = sg_dma_address(sg) + sg_used;
hw->control = copy;
if (chan->direction == DMA_MEM_TO_DEV) {
if (app_w)
memcpy(hw->app, app_w, sizeof(u32) *
XILINX_DMA_NUM_APP_WORDS);
}
if (prev)
prev->hw.next_desc = segment->phys;
prev = segment;
sg_used += copy;
/*
* Insert the segment into the descriptor segments
* list.
*/
list_add_tail(&segment->node, &desc->segments);
}
}
segment = list_first_entry(&desc->segments,
struct xilinx_axidma_tx_segment, node);
desc->async_tx.phys = segment->phys;
prev->hw.next_desc = segment->phys;
/* For the last DMA_MEM_TO_DEV transfer, set EOP */
if (chan->direction == DMA_MEM_TO_DEV) {
segment->hw.control |= XILINX_DMA_BD_SOP;
segment = list_last_entry(&desc->segments,
struct xilinx_axidma_tx_segment,
node);
segment->hw.control |= XILINX_DMA_BD_EOP;
}
return &desc->async_tx;
error:
xilinx_dma_free_tx_descriptor(chan, desc);
return NULL;
}
/**
* xilinx_dma_terminate_all - Halt the channel and free descriptors
* @chan: Driver specific DMA Channel pointer
@ -1224,22 +1587,26 @@ static int xilinx_dma_chan_probe(struct xilinx_dma_device *xdev,
chan->id = 0;
chan->ctrl_offset = XILINX_DMA_MM2S_CTRL_OFFSET;
chan->desc_offset = XILINX_VDMA_MM2S_DESC_OFFSET;
if (xdev->dmatype == XDMA_TYPE_VDMA) {
chan->desc_offset = XILINX_VDMA_MM2S_DESC_OFFSET;
if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH ||
xdev->flush_on_fsync == XILINX_DMA_FLUSH_MM2S)
chan->flush_on_fsync = true;
if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH ||
xdev->flush_on_fsync == XILINX_DMA_FLUSH_MM2S)
chan->flush_on_fsync = true;
}
} else if (of_device_is_compatible(node,
"xlnx,axi-vdma-s2mm-channel")) {
chan->direction = DMA_DEV_TO_MEM;
chan->id = 1;
chan->ctrl_offset = XILINX_DMA_S2MM_CTRL_OFFSET;
chan->desc_offset = XILINX_VDMA_S2MM_DESC_OFFSET;
if (xdev->dmatype == XDMA_TYPE_VDMA) {
chan->desc_offset = XILINX_VDMA_S2MM_DESC_OFFSET;
if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH ||
xdev->flush_on_fsync == XILINX_DMA_FLUSH_S2MM)
chan->flush_on_fsync = true;
if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH ||
xdev->flush_on_fsync == XILINX_DMA_FLUSH_S2MM)
chan->flush_on_fsync = true;
}
} else {
dev_err(xdev->dev, "Invalid channel compatible node\n");
return -EINVAL;
@ -1254,6 +1621,11 @@ static int xilinx_dma_chan_probe(struct xilinx_dma_device *xdev,
return err;
}
if (xdev->dmatype == XDMA_TYPE_AXIDMA)
chan->start_transfer = xilinx_dma_start_transfer;
else
chan->start_transfer = xilinx_vdma_start_transfer;
/* Initialize the tasklet */
tasklet_init(&chan->tasklet, xilinx_dma_do_tasklet,
(unsigned long)chan);
@ -1296,6 +1668,15 @@ 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 of_device_id xilinx_dma_of_ids[] = {
{ .compatible = "xlnx,axi-dma-1.00.a",
.data = (void *)XDMA_TYPE_AXIDMA },
{ .compatible = "xlnx,axi-vdma-1.00.a",
.data = (void *)XDMA_TYPE_VDMA },
{}
};
MODULE_DEVICE_TABLE(of, xilinx_dma_of_ids);
/**
* xilinx_dma_probe - Driver probe function
* @pdev: Pointer to the platform_device structure
@ -1317,6 +1698,7 @@ 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);
/* Request and map I/O memory */
io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@ -1327,16 +1709,21 @@ 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");
err = of_property_read_u32(node, "xlnx,num-fstores", &num_frames);
if (err < 0) {
dev_err(xdev->dev, "missing xlnx,num-fstores property\n");
return err;
}
if (xdev->dmatype == XDMA_TYPE_VDMA) {
err = of_property_read_u32(node, "xlnx,num-fstores",
&num_frames);
if (err < 0) {
dev_err(xdev->dev,
"missing xlnx,num-fstores property\n");
return err;
}
err = of_property_read_u32(node, "xlnx,flush-fsync",
&xdev->flush_on_fsync);
if (err < 0)
dev_warn(xdev->dev, "missing xlnx,flush-fsync property\n");
err = of_property_read_u32(node, "xlnx,flush-fsync",
&xdev->flush_on_fsync);
if (err < 0)
dev_warn(xdev->dev,
"missing xlnx,flush-fsync property\n");
}
err = of_property_read_u32(node, "xlnx,addrwidth", &addr_width);
if (err < 0)
@ -1361,11 +1748,18 @@ static int xilinx_dma_probe(struct platform_device *pdev)
xilinx_dma_alloc_chan_resources;
xdev->common.device_free_chan_resources =
xilinx_dma_free_chan_resources;
xdev->common.device_prep_interleaved_dma =
xilinx_vdma_dma_prep_interleaved;
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) {
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 {
xdev->common.device_prep_interleaved_dma =
xilinx_vdma_dma_prep_interleaved;
}
platform_set_drvdata(pdev, xdev);
@ -1376,9 +1770,11 @@ static int xilinx_dma_probe(struct platform_device *pdev)
goto error;
}
for (i = 0; i < XILINX_DMA_MAX_CHANS_PER_DEVICE; i++)
if (xdev->chan[i])
xdev->chan[i]->num_frms = num_frames;
if (xdev->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;
}
/* Register the DMA engine with the core */
dma_async_device_register(&xdev->common);
@ -1425,12 +1821,6 @@ static int xilinx_dma_remove(struct platform_device *pdev)
return 0;
}
static const struct of_device_id xilinx_dma_of_ids[] = {
{ .compatible = "xlnx,axi-vdma-1.00.a",},
{}
};
MODULE_DEVICE_TABLE(of, xilinx_dma_of_ids);
static struct platform_driver xilinx_vdma_driver = {
.driver = {
.name = "xilinx-vdma",

12
include/linux/dma/xilinx_dma.h
View File

@ -41,6 +41,18 @@ struct xilinx_vdma_config {
int ext_fsync;
};
/**
* enum xdma_ip_type: DMA IP type.
*
* XDMA_TYPE_AXIDMA: Axi dma ip.
* XDMA_TYPE_VDMA: Axi vdma ip.
*
*/
enum xdma_ip_type {
XDMA_TYPE_AXIDMA = 0,
XDMA_TYPE_VDMA,
};
int xilinx_vdma_channel_set_config(struct dma_chan *dchan,
struct xilinx_vdma_config *cfg);