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SRVR:BL2NAM02HT155; BCL:0; PCL:0; RULEID:; SRVR:BL2NAM02HT155; X-Forefront-PRVS: 0918748D70 X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Apr 2016 07:20:08.0721 (UTC) X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c; Ip=[149.199.60.100]; Helo=[xsj-pvapsmtpgw02] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL2NAM02HT155 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160420_002030_576561_DCE46C0C X-CRM114-Status: GOOD ( 16.50 ) X-Spam-Score: -1.9 (-) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: dmaengine@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Added basic clock support. The clocks are requested at probe and released at remove. Signed-off-by: Kedareswara rao Appana --- drivers/dma/xilinx/xilinx_vdma.c | 56 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) diff --git a/drivers/dma/xilinx/xilinx_vdma.c b/drivers/dma/xilinx/xilinx_vdma.c index 70caea6..d526029 100644 --- a/drivers/dma/xilinx/xilinx_vdma.c +++ b/drivers/dma/xilinx/xilinx_vdma.c @@ -44,6 +44,7 @@ #include #include #include +#include #include "../dmaengine.h" @@ -352,6 +353,8 @@ struct xilinx_dma_chan { * @flush_on_fsync: Flush on frame sync * @ext_addr: Indicates 64 bit addressing is supported by dma device * @dmatype: DMA ip type + * @clks: pointer to array of clocks + * @numclks: number of clocks available */ struct xilinx_dma_device { void __iomem *regs; @@ -362,6 +365,8 @@ struct xilinx_dma_device { u32 flush_on_fsync; bool ext_addr; enum xdma_ip_type dmatype; + struct clk **clks; + int numclks; }; /* Macros */ @@ -1731,6 +1736,26 @@ int xilinx_vdma_channel_set_config(struct dma_chan *dchan, } EXPORT_SYMBOL(xilinx_vdma_channel_set_config); +static int xdma_clk_init(struct xilinx_dma_device *xdev, bool enable) +{ + int i = 0, ret; + + for (i = 0; i < xdev->numclks; i++) { + if (enable) { + ret = clk_prepare_enable(xdev->clks[i]); + if (ret) { + dev_err(xdev->dev, + "failed to enable the axidma clock\n"); + return ret; + } + } else { + clk_disable_unprepare(xdev->clks[i]); + } + } + + return 0; +} + /* ----------------------------------------------------------------------------- * Probe and remove */ @@ -1919,6 +1944,7 @@ static int xilinx_dma_probe(struct platform_device *pdev) struct resource *io; u32 num_frames, addr_width; int i, err; + const char *str; /* Allocate and initialize the DMA engine structure */ xdev = devm_kzalloc(&pdev->dev, sizeof(*xdev), GFP_KERNEL); @@ -1965,6 +1991,32 @@ static int xilinx_dma_probe(struct platform_device *pdev) /* Set the dma mask bits */ dma_set_mask(xdev->dev, DMA_BIT_MASK(addr_width)); + xdev->numclks = of_property_count_strings(pdev->dev.of_node, + "clock-names"); + if (xdev->numclks > 0) { + xdev->clks = devm_kmalloc_array(&pdev->dev, xdev->numclks, + sizeof(struct clk *), + GFP_KERNEL); + if (!xdev->clks) + return -ENOMEM; + + for (i = 0; i < xdev->numclks; i++) { + of_property_read_string_index(pdev->dev.of_node, + "clock-names", i, &str); + xdev->clks[i] = devm_clk_get(xdev->dev, str); + if (IS_ERR(xdev->clks[i])) { + if (PTR_ERR(xdev->clks[i]) == -ENOENT) + xdev->clks[i] = NULL; + else + return PTR_ERR(xdev->clks[i]); + } + } + + err = xdma_clk_init(xdev, true); + if (err) + return err; + } + /* Initialize the DMA engine */ xdev->common.dev = &pdev->dev; @@ -2025,6 +2077,8 @@ static int xilinx_dma_probe(struct platform_device *pdev) return 0; error: + if (xdev->numclks > 0) + xdma_clk_init(xdev, false); for (i = 0; i < XILINX_DMA_MAX_CHANS_PER_DEVICE; i++) if (xdev->chan[i]) xilinx_dma_chan_remove(xdev->chan[i]); @@ -2050,6 +2104,8 @@ static int xilinx_dma_remove(struct platform_device *pdev) for (i = 0; i < XILINX_DMA_MAX_CHANS_PER_DEVICE; i++) if (xdev->chan[i]) xilinx_dma_chan_remove(xdev->chan[i]); + if (xdev->numclks > 0) + xdma_clk_init(xdev, false); return 0; }