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authorRameshwar Prasad Sahu <rsahu@apm.com>2015-07-21 18:44:39 +0530
committerVinod Koul <vinod.koul@intel.com>2015-08-20 11:57:11 +0530
commit89079493437701551938652003eb75b328425c66 (patch)
treec344bee96ef68ed7581624f7f3974029fb11f3e0 /drivers/dma/xgene-dma.c
parentb93edcdd037f713e9b62cc76fb2064282af01aec (diff)
downloadlinux-89079493437701551938652003eb75b328425c66.tar.bz2
dmaengine: xgene-dma: Add ACPI support for X-Gene DMA engine driver
This patch adds ACPI support for the APM X-Gene DMA engine driver. Signed-off-by: Rameshwar Prasad Sahu <rsahu@apm.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/xgene-dma.c')
-rw-r--r--drivers/dma/xgene-dma.c28
1 files changed, 21 insertions, 7 deletions
diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c
index fe87a634b145..d1c8809a0810 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>
@@ -1940,16 +1941,18 @@ 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 */
@@ -1994,7 +1997,8 @@ 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;
}
@@ -2018,11 +2022,20 @@ 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",},
{},
@@ -2035,6 +2048,7 @@ 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),
},
};