[PATCH v2 net-next 4/6] drivers: net: xgene-v2: Add base driver
Iyappan Subramanian
isubramanian at apm.com
Sun Feb 26 21:18:24 PST 2017
This patch adds,
- probe, remove, shutdown
- open, close and stats
- create and delete ring
- request and delete irq
Signed-off-by: Iyappan Subramanian <isubramanian at apm.com>
Signed-off-by: Keyur Chudgar <kchudgar at apm.com>
---
drivers/net/ethernet/apm/xgene-v2/main.c | 510 +++++++++++++++++++++++++++++++
1 file changed, 510 insertions(+)
create mode 100644 drivers/net/ethernet/apm/xgene-v2/main.c
diff --git a/drivers/net/ethernet/apm/xgene-v2/main.c b/drivers/net/ethernet/apm/xgene-v2/main.c
new file mode 100644
index 0000000..c96b4cc
--- /dev/null
+++ b/drivers/net/ethernet/apm/xgene-v2/main.c
@@ -0,0 +1,510 @@
+/*
+ * Applied Micro X-Gene SoC Ethernet v2 Driver
+ *
+ * Copyright (c) 2017, Applied Micro Circuits Corporation
+ * Author(s): Iyappan Subramanian <isubramanian at apm.com>
+ * Keyur Chudgar <kchudgar at apm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "main.h"
+
+static const struct acpi_device_id xge_acpi_match[];
+
+static int xge_get_resources(struct xge_pdata *pdata)
+{
+ struct platform_device *pdev;
+ struct net_device *ndev;
+ struct device *dev;
+ struct resource *res;
+ int phy_mode, ret = 0;
+
+ pdev = pdata->pdev;
+ dev = &pdev->dev;
+ ndev = pdata->ndev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "Resource enet_csr not defined\n");
+ return -ENODEV;
+ }
+
+ pdata->resources.base_addr = devm_ioremap(dev, res->start,
+ resource_size(res));
+ if (!pdata->resources.base_addr) {
+ dev_err(dev, "Unable to retrieve ENET Port CSR region\n");
+ return -ENOMEM;
+ }
+
+ if (!device_get_mac_address(dev, ndev->dev_addr, ETH_ALEN))
+ eth_hw_addr_random(ndev);
+
+ memcpy(ndev->perm_addr, ndev->dev_addr, ndev->addr_len);
+
+ phy_mode = device_get_phy_mode(dev);
+ if (phy_mode < 0) {
+ dev_err(dev, "Unable to get phy-connection-type\n");
+ return phy_mode;
+ }
+ pdata->resources.phy_mode = phy_mode;
+
+ if (pdata->resources.phy_mode != PHY_INTERFACE_MODE_RGMII) {
+ dev_err(dev, "Incorrect phy-connection-type specified\n");
+ return -ENODEV;
+ }
+
+ ret = platform_get_irq(pdev, 0);
+ if (ret <= 0) {
+ dev_err(dev, "Unable to get ENET IRQ\n");
+ ret = ret ? : -ENXIO;
+ return ret;
+ }
+ pdata->resources.irq = ret;
+
+ return 0;
+}
+
+static int xge_refill_buffers(struct net_device *ndev, u32 nbuf)
+{
+ struct xge_pdata *pdata = netdev_priv(ndev);
+ struct xge_desc_ring *ring = pdata->rx_ring;
+ const u8 slots = XGENE_ENET_NUM_DESC - 1;
+ struct device *dev = &pdata->pdev->dev;
+ struct xge_raw_desc *raw_desc;
+ u64 addr_lo, addr_hi;
+ u8 tail = ring->tail;
+ struct sk_buff *skb;
+ dma_addr_t dma_addr;
+ u16 len;
+ int i;
+
+ for (i = 0; i < nbuf; i++) {
+ raw_desc = &ring->raw_desc[tail];
+
+ len = XGENE_ENET_STD_MTU;
+ skb = netdev_alloc_skb(ndev, len);
+ if (unlikely(!skb))
+ return -ENOMEM;
+
+ dma_addr = dma_map_single(dev, skb->data, len, DMA_FROM_DEVICE);
+ if (dma_mapping_error(dev, dma_addr)) {
+ netdev_err(ndev, "DMA mapping error\n");
+ dev_kfree_skb_any(skb);
+ return -EINVAL;
+ }
+
+ ring->pkt_info[tail].skb = skb;
+ ring->pkt_info[tail].dma_addr = dma_addr;
+
+ addr_hi = GET_BITS(NEXT_DESC_ADDRH, le64_to_cpu(raw_desc->m1));
+ addr_lo = GET_BITS(NEXT_DESC_ADDRL, le64_to_cpu(raw_desc->m1));
+ raw_desc->m1 = cpu_to_le64(SET_BITS(NEXT_DESC_ADDRL, addr_lo) |
+ SET_BITS(NEXT_DESC_ADDRH, addr_hi) |
+ SET_BITS(PKT_ADDRH,
+ dma_addr >> PKT_ADDRL_LEN));
+
+ dma_wmb();
+ raw_desc->m0 = cpu_to_le64(SET_BITS(PKT_ADDRL, dma_addr) |
+ SET_BITS(E, 1));
+ tail = (tail + 1) & slots;
+ }
+
+ ring->tail = tail;
+
+ return 0;
+}
+
+static int xge_init_hw(struct net_device *ndev)
+{
+ struct xge_pdata *pdata = netdev_priv(ndev);
+ int ret;
+
+ ret = xge_port_reset(ndev);
+ if (ret)
+ return ret;
+
+ xge_port_init(ndev);
+ pdata->nbufs = NUM_BUFS;
+
+ return 0;
+}
+
+static irqreturn_t xge_irq(const int irq, void *data)
+{
+ struct xge_pdata *pdata = data;
+
+ if (napi_schedule_prep(&pdata->napi)) {
+ xge_intr_disable(pdata);
+ __napi_schedule(&pdata->napi);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int xge_request_irq(struct net_device *ndev)
+{
+ struct xge_pdata *pdata = netdev_priv(ndev);
+ struct device *dev = &pdata->pdev->dev;
+ int ret;
+
+ snprintf(pdata->irq_name, IRQ_ID_SIZE, "%s", ndev->name);
+
+ ret = devm_request_irq(dev, pdata->resources.irq, xge_irq,
+ 0, pdata->irq_name, pdata);
+ if (ret)
+ netdev_err(ndev, "Failed to request irq %s\n", pdata->irq_name);
+
+ return ret;
+}
+
+static void xge_free_irq(struct net_device *ndev)
+{
+ struct xge_pdata *pdata = netdev_priv(ndev);
+ struct device *dev = &pdata->pdev->dev;
+
+ devm_free_irq(dev, pdata->resources.irq, pdata);
+}
+
+static void xge_delete_desc_ring(struct net_device *ndev,
+ struct xge_desc_ring *ring)
+{
+ struct xge_pdata *pdata = netdev_priv(ndev);
+ struct device *dev = &pdata->pdev->dev;
+ u16 size;
+
+ if (!ring)
+ return;
+
+ size = XGENE_ENET_DESC_SIZE * XGENE_ENET_NUM_DESC;
+ if (ring->desc_addr)
+ dma_free_coherent(dev, size, ring->desc_addr, ring->dma_addr);
+
+ kfree(ring->pkt_info);
+ kfree(ring);
+}
+
+static void xge_free_buffers(struct net_device *ndev)
+{
+ struct xge_pdata *pdata = netdev_priv(ndev);
+ struct xge_desc_ring *ring = pdata->rx_ring;
+ struct device *dev = &pdata->pdev->dev;
+ struct sk_buff *skb;
+ dma_addr_t dma_addr;
+ int i;
+
+ for (i = 0; i < XGENE_ENET_NUM_DESC; i++) {
+ skb = ring->pkt_info[i].skb;
+ dma_addr = ring->pkt_info[i].dma_addr;
+
+ if (!skb)
+ continue;
+
+ dma_unmap_single(dev, dma_addr, XGENE_ENET_STD_MTU,
+ DMA_FROM_DEVICE);
+ dev_kfree_skb_any(skb);
+ }
+}
+
+static void xge_delete_desc_rings(struct net_device *ndev)
+{
+ struct xge_pdata *pdata = netdev_priv(ndev);
+
+ xge_delete_desc_ring(ndev, pdata->tx_ring);
+
+ xge_free_buffers(ndev);
+ xge_delete_desc_ring(ndev, pdata->rx_ring);
+}
+
+static struct xge_desc_ring *xge_create_desc_ring(struct net_device *ndev)
+{
+ struct xge_pdata *pdata = netdev_priv(ndev);
+ struct device *dev = &pdata->pdev->dev;
+ struct xge_desc_ring *ring;
+ u16 size;
+
+ ring = kzalloc(sizeof(struct xge_desc_ring), GFP_KERNEL);
+ if (!ring)
+ return NULL;
+
+ ring->ndev = ndev;
+
+ size = XGENE_ENET_DESC_SIZE * XGENE_ENET_NUM_DESC;
+ ring->desc_addr = dma_zalloc_coherent(dev, size, &ring->dma_addr,
+ GFP_KERNEL);
+ if (!ring->desc_addr)
+ goto err;
+
+ ring->pkt_info = kcalloc(XGENE_ENET_NUM_DESC, sizeof(struct pkt_info),
+ GFP_KERNEL);
+ if (!ring->pkt_info)
+ goto err;
+
+ xge_setup_desc(ring);
+
+ return ring;
+
+err:
+ xge_delete_desc_ring(ndev, ring);
+
+ return NULL;
+}
+
+static int xge_create_desc_rings(struct net_device *ndev)
+{
+ struct xge_pdata *pdata = netdev_priv(ndev);
+ struct xge_desc_ring *ring;
+ int ret;
+
+ /* create tx ring */
+ ring = xge_create_desc_ring(ndev);
+ if (!ring)
+ goto err;
+
+ pdata->tx_ring = ring;
+ xge_update_tx_desc_addr(pdata);
+
+ /* create rx ring */
+ ring = xge_create_desc_ring(ndev);
+ if (!ring)
+ goto err;
+
+ pdata->rx_ring = ring;
+ xge_update_rx_desc_addr(pdata);
+
+ ret = xge_refill_buffers(ndev, XGENE_ENET_NUM_DESC);
+ if (ret)
+ goto err;
+
+ return 0;
+err:
+ xge_delete_desc_rings(ndev);
+
+ return -ENOMEM;
+}
+
+static int xge_open(struct net_device *ndev)
+{
+ struct xge_pdata *pdata = netdev_priv(ndev);
+ int ret;
+
+ ret = xge_create_desc_rings(ndev);
+ if (ret)
+ return ret;
+
+ napi_enable(&pdata->napi);
+ ret = xge_request_irq(ndev);
+ if (ret)
+ return ret;
+
+ xge_intr_enable(pdata);
+ xge_wr_csr(pdata, DMARXCTRL, 1);
+ xge_mac_enable(pdata);
+ netif_start_queue(ndev);
+ netif_carrier_on(ndev);
+
+ return 0;
+}
+
+static int xge_close(struct net_device *ndev)
+{
+ struct xge_pdata *pdata = netdev_priv(ndev);
+
+ netif_carrier_off(ndev);
+ netif_stop_queue(ndev);
+ xge_mac_disable(pdata);
+
+ xge_intr_disable(pdata);
+ xge_free_irq(ndev);
+ napi_disable(&pdata->napi);
+ xge_delete_desc_rings(ndev);
+
+ return 0;
+}
+
+static int xge_set_mac_addr(struct net_device *ndev, void *addr)
+{
+ struct xge_pdata *pdata = netdev_priv(ndev);
+ int ret;
+
+ ret = eth_mac_addr(ndev, addr);
+ if (ret)
+ return ret;
+
+ xge_mac_set_station_addr(pdata);
+
+ return 0;
+}
+
+static void xge_timeout(struct net_device *ndev)
+{
+ struct xge_pdata *pdata = netdev_priv(ndev);
+
+ rtnl_lock();
+
+ if (netif_running(ndev)) {
+ netif_carrier_off(ndev);
+ netif_stop_queue(ndev);
+ xge_intr_disable(pdata);
+ napi_disable(&pdata->napi);
+
+ xge_wr_csr(pdata, DMATXCTRL, 0);
+ xge_txc_poll(ndev);
+ xge_free_pending_skb(ndev);
+ xge_wr_csr(pdata, DMATXSTATUS, ~0U);
+
+ xge_setup_desc(pdata->tx_ring);
+ xge_update_tx_desc_addr(pdata);
+ xge_mac_init(pdata);
+
+ napi_enable(&pdata->napi);
+ xge_intr_enable(pdata);
+ xge_mac_enable(pdata);
+ netif_start_queue(ndev);
+ netif_carrier_on(ndev);
+ }
+
+ rtnl_unlock();
+}
+
+static void xge_get_stats64(struct net_device *ndev,
+ struct rtnl_link_stats64 *storage)
+{
+ struct xge_pdata *pdata = netdev_priv(ndev);
+ struct xge_stats *stats = &pdata->stats;
+
+ storage->tx_packets += stats->tx_packets;
+ storage->tx_bytes += stats->tx_bytes;
+
+ storage->rx_packets += stats->rx_packets;
+ storage->rx_bytes += stats->rx_bytes;
+}
+
+static const struct net_device_ops xgene_ndev_ops = {
+ .ndo_open = xge_open,
+ .ndo_stop = xge_close,
+ .ndo_set_mac_address = xge_set_mac_addr,
+ .ndo_tx_timeout = xge_timeout,
+ .ndo_get_stats64 = xge_get_stats64,
+};
+
+static int xge_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct net_device *ndev;
+ struct xge_pdata *pdata;
+ int ret;
+
+ ndev = alloc_etherdev(sizeof(struct xge_pdata));
+ if (!ndev)
+ return -ENOMEM;
+
+ pdata = netdev_priv(ndev);
+
+ pdata->pdev = pdev;
+ pdata->ndev = ndev;
+ SET_NETDEV_DEV(ndev, dev);
+ platform_set_drvdata(pdev, pdata);
+ ndev->netdev_ops = &xgene_ndev_ops;
+
+ ndev->features |= NETIF_F_GSO |
+ NETIF_F_GRO;
+
+ ret = xge_get_resources(pdata);
+ if (ret)
+ goto err;
+
+ ndev->hw_features = ndev->features;
+
+ ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
+ if (ret) {
+ netdev_err(ndev, "No usable DMA configuration\n");
+ goto err;
+ }
+
+ ret = xge_init_hw(ndev);
+ if (ret)
+ goto err;
+
+ netif_napi_add(ndev, &pdata->napi, xge_napi, NAPI_POLL_WEIGHT);
+
+ netif_carrier_off(ndev);
+ ret = register_netdev(ndev);
+ if (ret) {
+ netdev_err(ndev, "Failed to register netdev\n");
+ goto err;
+ }
+
+ return 0;
+
+err:
+ free_netdev(ndev);
+
+ return ret;
+}
+
+static int xge_remove(struct platform_device *pdev)
+{
+ struct xge_pdata *pdata;
+ struct net_device *ndev;
+
+ pdata = platform_get_drvdata(pdev);
+ ndev = pdata->ndev;
+
+ rtnl_lock();
+ if (netif_running(ndev))
+ dev_close(ndev);
+ rtnl_unlock();
+
+ unregister_netdev(ndev);
+ free_netdev(ndev);
+
+ return 0;
+}
+
+static void xge_shutdown(struct platform_device *pdev)
+{
+ struct xge_pdata *pdata;
+
+ pdata = platform_get_drvdata(pdev);
+ if (!pdata)
+ return;
+
+ if (!pdata->ndev)
+ return;
+
+ xge_remove(pdev);
+}
+
+static const struct acpi_device_id xge_acpi_match[] = {
+ { "APMC0D80" },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, xge_acpi_match);
+
+static struct platform_driver xge_driver = {
+ .driver = {
+ .name = "xgene-enet-v2",
+ .acpi_match_table = ACPI_PTR(xge_acpi_match),
+ },
+ .probe = xge_probe,
+ .remove = xge_remove,
+ .shutdown = xge_shutdown,
+};
+module_platform_driver(xge_driver);
+
+MODULE_DESCRIPTION("APM X-Gene SoC Ethernet v2 driver");
+MODULE_AUTHOR("Iyappan Subramanian <isubramanian at apm.com>");
+MODULE_VERSION(XGENE_ENET_V2_VERSION);
+MODULE_LICENSE("GPL");
--
1.9.1
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