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Subject[PATCH v2 net-next 1/2] net: nixge: Separate ctrl and dma resources
Date
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
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