dmaengine: fsl-dpaa2-qdma: Adding shutdown hook

We need to ensure DMA engine could be stopped in order for kexec
to start the next kernel.
So add the shutdown operation support.
Signed-off-by: Peng Ma <peng.ma@nxp.com>
Link: https://lore.kernel.org/r/20200227042841.18358-1-peng.ma@nxp.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c

@@ -790,6 +790,22 @@ static int dpaa2_qdma_remove(struct fsl_mc_device *ls_dev)
 	return 0;
 }
 
+static void dpaa2_qdma_shutdown(struct fsl_mc_device *ls_dev)
+{
+	struct dpaa2_qdma_engine *dpaa2_qdma;
+	struct dpaa2_qdma_priv *priv;
+	struct device *dev;
+
+	dev = &ls_dev->dev;
+	priv = dev_get_drvdata(dev);
+	dpaa2_qdma = priv->dpaa2_qdma;
+
+	dpdmai_disable(priv->mc_io, 0, ls_dev->mc_handle);
+	dpaa2_dpdmai_dpio_unbind(priv);
+	dpdmai_close(priv->mc_io, 0, ls_dev->mc_handle);
+	dpdmai_destroy(priv->mc_io, 0, ls_dev->mc_handle);
+}
+
 static const struct fsl_mc_device_id dpaa2_qdma_id_table[] = {
 	{
 		.vendor = FSL_MC_VENDOR_FREESCALE,
@@ -805,6 +821,7 @@ static struct fsl_mc_driver dpaa2_qdma_driver = {
 	},
 	.probe          = dpaa2_qdma_probe,
 	.remove		= dpaa2_qdma_remove,
+	.shutdown	= dpaa2_qdma_shutdown,
 	.match_id_table	= dpaa2_qdma_id_table
 };
 

drivers/dma/fsl-dpaa2-qdma/dpdmai.c

@@ -159,6 +159,27 @@ int dpdmai_create(struct fsl_mc_io *mc_io, u32 cmd_flags,
 	return 0;
 }
 
+/**
+ * dpdmai_destroy() - Destroy the DPDMAI object and release all its resources.
+ * @mc_io:      Pointer to MC portal's I/O object
+ * @cmd_flags:  Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:      Token of DPDMAI object
+ *
+ * Return:      '0' on Success; error code otherwise.
+ */
+int dpdmai_destroy(struct fsl_mc_io *mc_io, u32 cmd_flags, u16 token)
+{
+	struct fsl_mc_command cmd = { 0 };
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPDMAI_CMDID_DESTROY,
+					  cmd_flags, token);
+
+	/* send command to mc*/
+	return mc_send_command(mc_io, &cmd);
+}
+EXPORT_SYMBOL_GPL(dpdmai_destroy);
+
 /**
  * dpdmai_enable() - Enable the DPDMAI, allow sending and receiving frames.
  * @mc_io:	Pointer to MC portal's I/O object

drivers/dma/fsl-dpaa2-qdma/dpdmai.h

@@ -18,6 +18,7 @@
 #define DPDMAI_CMDID_CLOSE		DPDMAI_CMDID_FORMAT(0x800)
 #define DPDMAI_CMDID_OPEN               DPDMAI_CMDID_FORMAT(0x80E)
 #define DPDMAI_CMDID_CREATE             DPDMAI_CMDID_FORMAT(0x90E)
+#define DPDMAI_CMDID_DESTROY            DPDMAI_CMDID_FORMAT(0x900)
 
 #define DPDMAI_CMDID_ENABLE             DPDMAI_CMDID_FORMAT(0x002)
 #define DPDMAI_CMDID_DISABLE            DPDMAI_CMDID_FORMAT(0x003)
@@ -160,6 +161,7 @@ struct dpdmai_rx_queue_attr {
 int dpdmai_open(struct fsl_mc_io *mc_io, u32 cmd_flags,
 		int dpdmai_id, u16 *token);
 int dpdmai_close(struct fsl_mc_io *mc_io, u32 cmd_flags, u16 token);
+int dpdmai_destroy(struct fsl_mc_io *mc_io, u32 cmd_flags, u16 token);
 int dpdmai_create(struct fsl_mc_io *mc_io, u32 cmd_flags,
 		  const struct dpdmai_cfg *cfg, u16 *token);
 int dpdmai_enable(struct fsl_mc_io *mc_io, u32 cmd_flags, u16 token);