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From:   alex.williams@ettus.com
To:     davem@davemloft.net
Cc:     robh+dt@kernel.org, mark.rutland@arm.com, mdf@kernel.org,
        mcgrof@kernel.org, keescook@chromium.org, netdev@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        Alex Williams <alex.williams@ni.com>
Subject: [PATCH v2 net-next 1/2] net: nixge: Separate ctrl and dma resources
Date:   Thu, 31 Jan 2019 13:33:27 -0800
Message-Id: <20190131213328.11236-1-alex.williams@ettus.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Alex Williams <alex.williams@ni.com>

The DMA engine is a separate entity altogether, and this allows the DMA
controller's address to float elsewhere in the FPGA's map.

Signed-off-by: Alex Williams <alex.williams@ni.com>
---
 drivers/net/ethernet/ni/nixge.c | 74 ++++++++++++++++++++++++++++++++---------
 1 file changed, 58 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/ni/nixge.c b/drivers/net/ethernet/ni/nixge.c
index 1e408d1a9b5f..73a98bd2fcd2 100644
--- a/drivers/net/ethernet/ni/nixge.c
+++ b/drivers/net/ethernet/ni/nixge.c
@@ -105,6 +105,12 @@
 #define NIXGE_MAX_JUMBO_FRAME_SIZE \
 	(NIXGE_JUMBO_MTU + NIXGE_HDR_SIZE + NIXGE_TRL_SIZE)
 
+enum nixge_version {
+	NIXGE_V2,
+	NIXGE_V3,
+	NIXGE_VERSION_COUNT
+};
+
 struct nixge_hw_dma_bd {
 	u32 next_lo;
 	u32 next_hi;
@@ -1225,11 +1231,59 @@ static void *nixge_get_nvmem_address(struct device *dev)
 	return mac;
 }
 
+/* Match table for of_platform binding */
+static const struct of_device_id nixge_dt_ids[] = {
+	{ .compatible = "ni,xge-enet-2.00", .data = (void *)NIXGE_V2 },
+	{ .compatible = "ni,xge-enet-3.00", .data = (void *)NIXGE_V3 },
+	{},
+};
+MODULE_DEVICE_TABLE(of, nixge_dt_ids);
+
+static int nixge_of_get_resources(struct platform_device *pdev)
+{
+	const struct of_device_id *of_id;
+	enum nixge_version version;
+	struct resource *ctrlres;
+	struct resource *dmares;
+	struct net_device *ndev;
+	struct nixge_priv *priv;
+
+	ndev = platform_get_drvdata(pdev);
+	priv = netdev_priv(ndev);
+	of_id = of_match_node(nixge_dt_ids, pdev->dev.of_node);
+	if (!of_id)
+		return -ENODEV;
+
+	version = (enum nixge_version)of_id->data;
+	if (version <= NIXGE_V2)
+		dmares = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	else
+		dmares = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+						      "dma");
+
+	priv->dma_regs = devm_ioremap_resource(&pdev->dev, dmares);
+	if (IS_ERR(priv->dma_regs)) {
+		netdev_err(ndev, "failed to map dma regs\n");
+		return PTR_ERR(priv->dma_regs);
+	}
+	if (version <= NIXGE_V2) {
+		priv->ctrl_regs = priv->dma_regs + NIXGE_REG_CTRL_OFFSET;
+	} else {
+		ctrlres = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+						       "ctrl");
+		priv->ctrl_regs = devm_ioremap_resource(&pdev->dev, ctrlres);
+	}
+	if (IS_ERR(priv->ctrl_regs)) {
+		netdev_err(ndev, "failed to map ctrl regs\n");
+		return PTR_ERR(priv->ctrl_regs);
+	}
+	return 0;
+}
+
 static int nixge_probe(struct platform_device *pdev)
 {
 	struct nixge_priv *priv;
 	struct net_device *ndev;
-	struct resource *dmares;
 	const u8 *mac_addr;
 	int err;
 
@@ -1261,14 +1315,9 @@ static int nixge_probe(struct platform_device *pdev)
 	priv->dev = &pdev->dev;
 
 	netif_napi_add(ndev, &priv->napi, nixge_poll, NAPI_POLL_WEIGHT);
-
-	dmares = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	priv->dma_regs = devm_ioremap_resource(&pdev->dev, dmares);
-	if (IS_ERR(priv->dma_regs)) {
-		netdev_err(ndev, "failed to map dma regs\n");
-		return PTR_ERR(priv->dma_regs);
-	}
-	priv->ctrl_regs = priv->dma_regs + NIXGE_REG_CTRL_OFFSET;
+	err = nixge_of_get_resources(pdev);
+	if (err)
+		return err;
 	__nixge_hw_set_mac_address(ndev);
 
 	priv->tx_irq = platform_get_irq_byname(pdev, "tx");
@@ -1337,13 +1386,6 @@ static int nixge_remove(struct platform_device *pdev)
 	return 0;
 }
 
-/* Match table for of_platform binding */
-static const struct of_device_id nixge_dt_ids[] = {
-	{ .compatible = "ni,xge-enet-2.00", },
-	{},
-};
-MODULE_DEVICE_TABLE(of, nixge_dt_ids);
-
 static struct platform_driver nixge_driver = {
 	.probe		= nixge_probe,
 	.remove		= nixge_remove,
-- 
2.14.5