diff options
| author | Rameshwar Prasad Sahu <rsahu@apm.com> | 2015-07-21 18:44:39 +0530 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2015-08-20 11:57:11 +0530 |
| commit | 89079493437701551938652003eb75b328425c66 (patch) | |
| tree | c344bee96ef68ed7581624f7f3974029fb11f3e0 /drivers/dma/xgene-dma.c | |
| parent | b93edcdd037f713e9b62cc76fb2064282af01aec (diff) | |
| download | linux-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.c | 28 |
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), }, }; |