linux-kernel - [PATCH 08/11] mfd: flexcard: add DMA device

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Date:	Wed, 25 Mar 2015 10:51:57 +0100
From:	Holger Dengler <dengler@...utronix.de>
To:	linux-kernel@...r.kernel.org
Cc:	Peter Mahler <mahler@...ug.com>, Juergen Bubeck <bubeck@...ug.com>,
	Benedikt Spranger <b.spranger@...utronix.de>,
	Holger Dengler <dengler@...utronix.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 08/11] mfd: flexcard: add DMA device

From: Benedikt Spranger <b.spranger@...utronix.de>

The Flexcard interface design split packet receive and transmit. All
received packets and card status information are multiplexed with a
Flexcard specific protocol and handled through a DMA capable ringbuffer.
The TX path has to poke each available component separate.

Add a platform device for the DMA receive channel.

Signed-off-by: Holger Dengler <dengler@...utronix.de>
Signed-off-by: Benedikt Spranger <b.spranger@...utronix.de>
cc: Samuel Ortiz <sameo@...ux.intel.com>
cc: Lee Jones <lee.jones@...aro.org>
---
 drivers/mfd/flexcard/core.c     | 60 +++++++++++++++++++++++++++++++++++++++++
 drivers/mfd/flexcard/flexcard.h |  5 ++++
 2 files changed, 65 insertions(+)

diff --git a/drivers/mfd/flexcard/core.c b/drivers/mfd/flexcard/core.c
index cd06854..39d1d4d 100644
--- a/drivers/mfd/flexcard/core.c
+++ b/drivers/mfd/flexcard/core.c
@@ -52,6 +52,34 @@ static struct mfd_cell flexcard_clk_dev[] = {
 	},
 };
 
+static struct resource flexcard_dma_res[] = {
+	{
+		.name   = "flexcard-dma",
+		.start  = 0x500,
+		.end    = 0x580,
+		.flags  = IORESOURCE_MEM,
+	}, {
+		.name   = "flexcard-dma",
+		.start  = FLEXCARD_DMA_IRQ_CBL,
+		.end    = FLEXCARD_DMA_IRQ_CBL,
+		.flags  = IORESOURCE_IRQ,
+	}, {
+		.name   = "flexcard-dma",
+		.start  = FLEXCARD_DMA_IRQ_CO,
+		.end    = FLEXCARD_DMA_IRQ_CO,
+		.flags  = IORESOURCE_IRQ,
+	},
+};
+
+static struct mfd_cell flexcard_dma_dev[] = {
+	{
+		.id = 0,
+		.name = "flexcard-dma",
+		.num_resources = ARRAY_SIZE(flexcard_dma_res),
+		.resources = flexcard_dma_res,
+	},
+};
+
 irq_res(CC1CCYS);
 irq_res(CC2CCYS);
 irq_res(CC3CCYS);
@@ -187,6 +215,32 @@ static int flexcard_clk_setup(struct flexcard_device *priv)
 			       &pdev->resource[0], 0, NULL);
 }
 
+static int flexcard_add_dma(struct flexcard_device *priv)
+{
+	struct pci_dev *pdev = priv->pdev;
+
+	/* check for a DMA capable firmware version*/
+	if (priv->conf->fc_fw_ver.maj < DMA_MIN_FW_MAJOR)
+		goto out;
+
+	if (priv->conf->fc_fw_ver.maj == DMA_MIN_FW_MAJOR) {
+		if (priv->conf->fc_fw_ver.min < DMA_MIN_FW_MINOR)
+			goto out;
+		if ((priv->conf->fc_fw_ver.min == DMA_MIN_FW_MINOR) &&
+		    (priv->conf->fc_fw_ver.dev < DMA_MIN_FW_UPDATE))
+			goto out;
+	}
+
+	return mfd_add_devices(&pdev->dev, 0, flexcard_dma_dev,
+			       ARRAY_SIZE(flexcard_dma_dev),
+			       &pdev->resource[0], 0, priv->dma_domain);
+
+out:
+	dev_info(&pdev->dev, "Firmware is not DMA capable\n");
+
+	return 0;
+}
+
 static int flexcard_add_uio(struct flexcard_device *priv)
 {
 	struct pci_dev *pdev = priv->pdev;
@@ -330,6 +384,12 @@ static int flexcard_probe(struct pci_dev *pdev,
 		goto out_remove;
 	}
 
+	ret = flexcard_add_dma(priv);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to add DMA device: %d", ret);
+		goto out_remove;
+	}
+
 	ret = flexcard_add_uio(priv);
 	if (ret) {
 		dev_err(&pdev->dev, "unable to add irq UIO devices: %d", ret);
diff --git a/drivers/mfd/flexcard/flexcard.h b/drivers/mfd/flexcard/flexcard.h
index 0d05f78..ee6b773 100644
--- a/drivers/mfd/flexcard/flexcard.h
+++ b/drivers/mfd/flexcard/flexcard.h
@@ -1,6 +1,11 @@
 #ifndef __FLEXCARD_H
 #define  __FLEXCARD_H
 
+/* The first FW Version supporting DMA is 6.4.0 */
+#define DMA_MIN_FW_MAJOR	6
+#define DMA_MIN_FW_MINOR	4
+#define DMA_MIN_FW_UPDATE	0
+
 int flexcard_misc_add_attrs(struct device *dev);
 void flexcard_misc_del_attrs(struct device *dev);
 int flexcard_setup_irq(struct pci_dev *pdev);
-- 
2.1.4

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