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authorLinus Torvalds <torvalds@linux-foundation.org>2015-09-04 11:10:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-04 11:10:18 -0700
commit352712274507645b6f82b8763977ad87321919a3 (patch)
tree62ec7872a91e8e984f557f96496f2a369631a068 /drivers/dma/xgene-dma.c
parent88a99886c26fec8bf662e7b6bc080431a8660326 (diff)
parentab98193dace971f4742eebb5103212e23bb392f5 (diff)
downloadop-kernel-dev-352712274507645b6f82b8763977ad87321919a3.zip
op-kernel-dev-352712274507645b6f82b8763977ad87321919a3.tar.gz
Merge tag 'dmaengine-4.3-rc1' of git://git.infradead.org/users/vkoul/slave-dma
Pull dmaengine updates from Vinod Koul: "This time we have aded a new capability for scatter-gathered memset using dmaengine APIs. This is supported in xdmac & hdmac drivers We have added support for reusing descriptors for examples like video buffers etc. Driver will follow The behaviour of descriptor ack has been clarified and documented New devices added are: - dma controller in sun[457]i SoCs - lpc18xx dmamux - ZTE ZX296702 dma controller - Analog Devices AXI-DMAC DMA controller - eDMA support for dma-crossbar - imx6sx support in imx-sdma driver - imx-sdma device to device support Other: - jz4780 fixes - ioatdma large refactor and cleanup for removal of ioat v1 and v2 which is deprecated and fixes - ACPI support in X-Gene DMA engine driver - ipu irq fixes - mvxor fixes - minor fixes spread thru drivers" [ The Kconfig and Makefile entries got re-sorted alphabetically, and I handled the conflict with the new Intel integrated IDMA driver by slightly mis-sorting it on purpose: "IDMA64" got sorted after "IMX" in order to keep the Intel entries together. I think it might be a good idea to just rename the IDMA64 config entry to INTEL_IDMA64 to make the sorting be a true sort, not this mismash. Also, this merge disables the COMPILE_TEST for the sun4i DMA controller, because it does not compile cleanly at all. - Linus ] * tag 'dmaengine-4.3-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (89 commits) dmaengine: ioatdma: add Broadwell EP ioatdma PCI dev IDs dmaengine :ipu: change ipu_irq_handler() to remove compile warning dmaengine: ioatdma: Fix variable array length dmaengine: ioatdma: fix sparse "error" with prep lock dmaengine: hdmac: Add memset capabilities dmaengine: sort the sh Makefile dmaengine: sort the sh Kconfig dmaengine: sort the dw Kconfig dmaengine: sort the Kconfig dmaengine: sort the makefile drivers/dma: make mv_xor.c driver explicitly non-modular dmaengine: Add support for the Analog Devices AXI-DMAC DMA controller devicetree: Add bindings documentation for Analog Devices AXI-DMAC dmaengine: xgene-dma: Fix the lock to allow client for further submission of requests dmaengine: ioatdma: fix coccinelle warning dmaengine: ioatdma: fix zero day warning on incompatible pointer type dmaengine: tegra-apb: Simplify locking for device using global pause dmaengine: tegra-apb: Remove unnecessary return statements and variables dmaengine: tegra-apb: Avoid unnecessary channel base address calculation dmaengine: tegra-apb: Remove unused variables ...
Diffstat (limited to 'drivers/dma/xgene-dma.c')
-rw-r--r--drivers/dma/xgene-dma.c66
1 files changed, 45 insertions, 21 deletions
diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c
index dff22ab..b23e8d5 100644
--- a/drivers/dma/xgene-dma.c
+++ b/drivers/dma/xgene-dma.c
@@ -21,6 +21,7 @@
* NOTE: PM support is currently not available.
*/
+#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
@@ -151,7 +152,6 @@
#define XGENE_DMA_PQ_CHANNEL 1
#define XGENE_DMA_MAX_BYTE_CNT 0x4000 /* 16 KB */
#define XGENE_DMA_MAX_64B_DESC_BYTE_CNT 0x14000 /* 80 KB */
-#define XGENE_DMA_XOR_ALIGNMENT 6 /* 64 Bytes */
#define XGENE_DMA_MAX_XOR_SRC 5
#define XGENE_DMA_16K_BUFFER_LEN_CODE 0x0
#define XGENE_DMA_INVALID_LEN_CODE 0x7800000000000000ULL
@@ -764,12 +764,17 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
struct xgene_dma_ring *ring = &chan->rx_ring;
struct xgene_dma_desc_sw *desc_sw, *_desc_sw;
struct xgene_dma_desc_hw *desc_hw;
+ struct list_head ld_completed;
u8 status;
+ INIT_LIST_HEAD(&ld_completed);
+
+ spin_lock_bh(&chan->lock);
+
/* Clean already completed and acked descriptors */
xgene_dma_clean_completed_descriptor(chan);
- /* Run the callback for each descriptor, in order */
+ /* Move all completed descriptors to ld completed queue, in order */
list_for_each_entry_safe(desc_sw, _desc_sw, &chan->ld_running, node) {
/* Get subsequent hw descriptor from DMA rx ring */
desc_hw = &ring->desc_hw[ring->head];
@@ -812,15 +817,17 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
/* Mark this hw descriptor as processed */
desc_hw->m0 = cpu_to_le64(XGENE_DMA_DESC_EMPTY_SIGNATURE);
- xgene_dma_run_tx_complete_actions(chan, desc_sw);
-
- xgene_dma_clean_running_descriptor(chan, desc_sw);
-
/*
* Decrement the pending transaction count
* as we have processed one
*/
chan->pending--;
+
+ /*
+ * Delete this node from ld running queue and append it to
+ * ld completed queue for further processing
+ */
+ list_move_tail(&desc_sw->node, &ld_completed);
}
/*
@@ -829,6 +836,14 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan)
* ahead and free the descriptors below.
*/
xgene_chan_xfer_ld_pending(chan);
+
+ spin_unlock_bh(&chan->lock);
+
+ /* Run the callback for each descriptor, in order */
+ list_for_each_entry_safe(desc_sw, _desc_sw, &ld_completed, node) {
+ xgene_dma_run_tx_complete_actions(chan, desc_sw);
+ xgene_dma_clean_running_descriptor(chan, desc_sw);
+ }
}
static int xgene_dma_alloc_chan_resources(struct dma_chan *dchan)
@@ -877,11 +892,11 @@ static void xgene_dma_free_chan_resources(struct dma_chan *dchan)
if (!chan->desc_pool)
return;
- spin_lock_bh(&chan->lock);
-
/* Process all running descriptor */
xgene_dma_cleanup_descriptors(chan);
+ spin_lock_bh(&chan->lock);
+
/* Clean all link descriptor queues */
xgene_dma_free_desc_list(chan, &chan->ld_pending);
xgene_dma_free_desc_list(chan, &chan->ld_running);
@@ -1201,15 +1216,11 @@ static void xgene_dma_tasklet_cb(unsigned long data)
{
struct xgene_dma_chan *chan = (struct xgene_dma_chan *)data;
- spin_lock_bh(&chan->lock);
-
/* Run all cleanup for descriptors which have been completed */
xgene_dma_cleanup_descriptors(chan);
/* Re-enable DMA channel IRQ */
enable_irq(chan->rx_irq);
-
- spin_unlock_bh(&chan->lock);
}
static irqreturn_t xgene_dma_chan_ring_isr(int irq, void *id)
@@ -1741,13 +1752,13 @@ static void xgene_dma_set_caps(struct xgene_dma_chan *chan,
if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
dma_dev->device_prep_dma_xor = xgene_dma_prep_xor;
dma_dev->max_xor = XGENE_DMA_MAX_XOR_SRC;
- dma_dev->xor_align = XGENE_DMA_XOR_ALIGNMENT;
+ dma_dev->xor_align = DMAENGINE_ALIGN_64_BYTES;
}
if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
dma_dev->device_prep_dma_pq = xgene_dma_prep_pq;
dma_dev->max_pq = XGENE_DMA_MAX_XOR_SRC;
- dma_dev->pq_align = XGENE_DMA_XOR_ALIGNMENT;
+ dma_dev->pq_align = DMAENGINE_ALIGN_64_BYTES;
}
}
@@ -1944,16 +1955,18 @@ static int xgene_dma_probe(struct platform_device *pdev)
return ret;
pdma->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(pdma->clk)) {
+ if (IS_ERR(pdma->clk) && !ACPI_COMPANION(&pdev->dev)) {
dev_err(&pdev->dev, "Failed to get clk\n");
return PTR_ERR(pdma->clk);
}
/* Enable clk before accessing registers */
- ret = clk_prepare_enable(pdma->clk);
- if (ret) {
- dev_err(&pdev->dev, "Failed to enable clk %d\n", ret);
- return ret;
+ if (!IS_ERR(pdma->clk)) {
+ ret = clk_prepare_enable(pdma->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to enable clk %d\n", ret);
+ return ret;
+ }
}
/* Remove DMA RAM out of shutdown */
@@ -1998,7 +2011,8 @@ err_request_irq:
err_dma_mask:
err_clk_enable:
- clk_disable_unprepare(pdma->clk);
+ if (!IS_ERR(pdma->clk))
+ clk_disable_unprepare(pdma->clk);
return ret;
}
@@ -2022,11 +2036,20 @@ static int xgene_dma_remove(struct platform_device *pdev)
xgene_dma_delete_chan_rings(chan);
}
- clk_disable_unprepare(pdma->clk);
+ if (!IS_ERR(pdma->clk))
+ clk_disable_unprepare(pdma->clk);
return 0;
}
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id xgene_dma_acpi_match_ptr[] = {
+ {"APMC0D43", 0},
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, xgene_dma_acpi_match_ptr);
+#endif
+
static const struct of_device_id xgene_dma_of_match_ptr[] = {
{.compatible = "apm,xgene-storm-dma",},
{},
@@ -2039,6 +2062,7 @@ static struct platform_driver xgene_dma_driver = {
.driver = {
.name = "X-Gene-DMA",
.of_match_table = xgene_dma_of_match_ptr,
+ .acpi_match_table = ACPI_PTR(xgene_dma_acpi_match_ptr),
},
};
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