summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/net/ethernet/renesas/ravb_main.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/drivers/net/ethernet/renesas/ravb_main.c')
-rw-r--r--kernel/drivers/net/ethernet/renesas/ravb_main.c1894
1 files changed, 1894 insertions, 0 deletions
diff --git a/kernel/drivers/net/ethernet/renesas/ravb_main.c b/kernel/drivers/net/ethernet/renesas/ravb_main.c
new file mode 100644
index 000000000..467d41698
--- /dev/null
+++ b/kernel/drivers/net/ethernet/renesas/ravb_main.c
@@ -0,0 +1,1894 @@
+/* Renesas Ethernet AVB device driver
+ *
+ * Copyright (C) 2014-2015 Renesas Electronics Corporation
+ * Copyright (C) 2015 Renesas Solutions Corp.
+ * Copyright (C) 2015 Cogent Embedded, Inc. <source@cogentembedded.com>
+ *
+ * Based on the SuperH Ethernet driver
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License version 2,
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/cache.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/if_vlan.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/net_tstamp.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/of_mdio.h>
+#include <linux/of_net.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#include "ravb.h"
+
+#define RAVB_DEF_MSG_ENABLE \
+ (NETIF_MSG_LINK | \
+ NETIF_MSG_TIMER | \
+ NETIF_MSG_RX_ERR | \
+ NETIF_MSG_TX_ERR)
+
+int ravb_wait(struct net_device *ndev, enum ravb_reg reg, u32 mask, u32 value)
+{
+ int i;
+
+ for (i = 0; i < 10000; i++) {
+ if ((ravb_read(ndev, reg) & mask) == value)
+ return 0;
+ udelay(10);
+ }
+ return -ETIMEDOUT;
+}
+
+static int ravb_config(struct net_device *ndev)
+{
+ int error;
+
+ /* Set config mode */
+ ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) | CCC_OPC_CONFIG,
+ CCC);
+ /* Check if the operating mode is changed to the config mode */
+ error = ravb_wait(ndev, CSR, CSR_OPS, CSR_OPS_CONFIG);
+ if (error)
+ netdev_err(ndev, "failed to switch device to config mode\n");
+
+ return error;
+}
+
+static void ravb_set_duplex(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ u32 ecmr = ravb_read(ndev, ECMR);
+
+ if (priv->duplex) /* Full */
+ ecmr |= ECMR_DM;
+ else /* Half */
+ ecmr &= ~ECMR_DM;
+ ravb_write(ndev, ecmr, ECMR);
+}
+
+static void ravb_set_rate(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+
+ switch (priv->speed) {
+ case 100: /* 100BASE */
+ ravb_write(ndev, GECMR_SPEED_100, GECMR);
+ break;
+ case 1000: /* 1000BASE */
+ ravb_write(ndev, GECMR_SPEED_1000, GECMR);
+ break;
+ default:
+ break;
+ }
+}
+
+static void ravb_set_buffer_align(struct sk_buff *skb)
+{
+ u32 reserve = (unsigned long)skb->data & (RAVB_ALIGN - 1);
+
+ if (reserve)
+ skb_reserve(skb, RAVB_ALIGN - reserve);
+}
+
+/* Get MAC address from the MAC address registers
+ *
+ * Ethernet AVB device doesn't have ROM for MAC address.
+ * This function gets the MAC address that was used by a bootloader.
+ */
+static void ravb_read_mac_address(struct net_device *ndev, const u8 *mac)
+{
+ if (mac) {
+ ether_addr_copy(ndev->dev_addr, mac);
+ } else {
+ ndev->dev_addr[0] = (ravb_read(ndev, MAHR) >> 24);
+ ndev->dev_addr[1] = (ravb_read(ndev, MAHR) >> 16) & 0xFF;
+ ndev->dev_addr[2] = (ravb_read(ndev, MAHR) >> 8) & 0xFF;
+ ndev->dev_addr[3] = (ravb_read(ndev, MAHR) >> 0) & 0xFF;
+ ndev->dev_addr[4] = (ravb_read(ndev, MALR) >> 8) & 0xFF;
+ ndev->dev_addr[5] = (ravb_read(ndev, MALR) >> 0) & 0xFF;
+ }
+}
+
+static void ravb_mdio_ctrl(struct mdiobb_ctrl *ctrl, u32 mask, int set)
+{
+ struct ravb_private *priv = container_of(ctrl, struct ravb_private,
+ mdiobb);
+ u32 pir = ravb_read(priv->ndev, PIR);
+
+ if (set)
+ pir |= mask;
+ else
+ pir &= ~mask;
+ ravb_write(priv->ndev, pir, PIR);
+}
+
+/* MDC pin control */
+static void ravb_set_mdc(struct mdiobb_ctrl *ctrl, int level)
+{
+ ravb_mdio_ctrl(ctrl, PIR_MDC, level);
+}
+
+/* Data I/O pin control */
+static void ravb_set_mdio_dir(struct mdiobb_ctrl *ctrl, int output)
+{
+ ravb_mdio_ctrl(ctrl, PIR_MMD, output);
+}
+
+/* Set data bit */
+static void ravb_set_mdio_data(struct mdiobb_ctrl *ctrl, int value)
+{
+ ravb_mdio_ctrl(ctrl, PIR_MDO, value);
+}
+
+/* Get data bit */
+static int ravb_get_mdio_data(struct mdiobb_ctrl *ctrl)
+{
+ struct ravb_private *priv = container_of(ctrl, struct ravb_private,
+ mdiobb);
+
+ return (ravb_read(priv->ndev, PIR) & PIR_MDI) != 0;
+}
+
+/* MDIO bus control struct */
+static struct mdiobb_ops bb_ops = {
+ .owner = THIS_MODULE,
+ .set_mdc = ravb_set_mdc,
+ .set_mdio_dir = ravb_set_mdio_dir,
+ .set_mdio_data = ravb_set_mdio_data,
+ .get_mdio_data = ravb_get_mdio_data,
+};
+
+/* Free skb's and DMA buffers for Ethernet AVB */
+static void ravb_ring_free(struct net_device *ndev, int q)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ int ring_size;
+ int i;
+
+ /* Free RX skb ringbuffer */
+ if (priv->rx_skb[q]) {
+ for (i = 0; i < priv->num_rx_ring[q]; i++)
+ dev_kfree_skb(priv->rx_skb[q][i]);
+ }
+ kfree(priv->rx_skb[q]);
+ priv->rx_skb[q] = NULL;
+
+ /* Free TX skb ringbuffer */
+ if (priv->tx_skb[q]) {
+ for (i = 0; i < priv->num_tx_ring[q]; i++)
+ dev_kfree_skb(priv->tx_skb[q][i]);
+ }
+ kfree(priv->tx_skb[q]);
+ priv->tx_skb[q] = NULL;
+
+ /* Free aligned TX buffers */
+ kfree(priv->tx_align[q]);
+ priv->tx_align[q] = NULL;
+
+ if (priv->rx_ring[q]) {
+ ring_size = sizeof(struct ravb_ex_rx_desc) *
+ (priv->num_rx_ring[q] + 1);
+ dma_free_coherent(ndev->dev.parent, ring_size, priv->rx_ring[q],
+ priv->rx_desc_dma[q]);
+ priv->rx_ring[q] = NULL;
+ }
+
+ if (priv->tx_ring[q]) {
+ ring_size = sizeof(struct ravb_tx_desc) *
+ (priv->num_tx_ring[q] * NUM_TX_DESC + 1);
+ dma_free_coherent(ndev->dev.parent, ring_size, priv->tx_ring[q],
+ priv->tx_desc_dma[q]);
+ priv->tx_ring[q] = NULL;
+ }
+}
+
+/* Format skb and descriptor buffer for Ethernet AVB */
+static void ravb_ring_format(struct net_device *ndev, int q)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ struct ravb_ex_rx_desc *rx_desc;
+ struct ravb_tx_desc *tx_desc;
+ struct ravb_desc *desc;
+ int rx_ring_size = sizeof(*rx_desc) * priv->num_rx_ring[q];
+ int tx_ring_size = sizeof(*tx_desc) * priv->num_tx_ring[q] *
+ NUM_TX_DESC;
+ dma_addr_t dma_addr;
+ int i;
+
+ priv->cur_rx[q] = 0;
+ priv->cur_tx[q] = 0;
+ priv->dirty_rx[q] = 0;
+ priv->dirty_tx[q] = 0;
+
+ memset(priv->rx_ring[q], 0, rx_ring_size);
+ /* Build RX ring buffer */
+ for (i = 0; i < priv->num_rx_ring[q]; i++) {
+ /* RX descriptor */
+ rx_desc = &priv->rx_ring[q][i];
+ /* The size of the buffer should be on 16-byte boundary. */
+ rx_desc->ds_cc = cpu_to_le16(ALIGN(PKT_BUF_SZ, 16));
+ dma_addr = dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->data,
+ ALIGN(PKT_BUF_SZ, 16),
+ DMA_FROM_DEVICE);
+ /* We just set the data size to 0 for a failed mapping which
+ * should prevent DMA from happening...
+ */
+ if (dma_mapping_error(ndev->dev.parent, dma_addr))
+ rx_desc->ds_cc = cpu_to_le16(0);
+ rx_desc->dptr = cpu_to_le32(dma_addr);
+ rx_desc->die_dt = DT_FEMPTY;
+ }
+ rx_desc = &priv->rx_ring[q][i];
+ rx_desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
+ rx_desc->die_dt = DT_LINKFIX; /* type */
+
+ memset(priv->tx_ring[q], 0, tx_ring_size);
+ /* Build TX ring buffer */
+ for (i = 0, tx_desc = priv->tx_ring[q]; i < priv->num_tx_ring[q];
+ i++, tx_desc++) {
+ tx_desc->die_dt = DT_EEMPTY;
+ tx_desc++;
+ tx_desc->die_dt = DT_EEMPTY;
+ }
+ tx_desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]);
+ tx_desc->die_dt = DT_LINKFIX; /* type */
+
+ /* RX descriptor base address for best effort */
+ desc = &priv->desc_bat[RX_QUEUE_OFFSET + q];
+ desc->die_dt = DT_LINKFIX; /* type */
+ desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
+
+ /* TX descriptor base address for best effort */
+ desc = &priv->desc_bat[q];
+ desc->die_dt = DT_LINKFIX; /* type */
+ desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]);
+}
+
+/* Init skb and descriptor buffer for Ethernet AVB */
+static int ravb_ring_init(struct net_device *ndev, int q)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ struct sk_buff *skb;
+ int ring_size;
+ int i;
+
+ /* Allocate RX and TX skb rings */
+ priv->rx_skb[q] = kcalloc(priv->num_rx_ring[q],
+ sizeof(*priv->rx_skb[q]), GFP_KERNEL);
+ priv->tx_skb[q] = kcalloc(priv->num_tx_ring[q],
+ sizeof(*priv->tx_skb[q]), GFP_KERNEL);
+ if (!priv->rx_skb[q] || !priv->tx_skb[q])
+ goto error;
+
+ for (i = 0; i < priv->num_rx_ring[q]; i++) {
+ skb = netdev_alloc_skb(ndev, PKT_BUF_SZ + RAVB_ALIGN - 1);
+ if (!skb)
+ goto error;
+ ravb_set_buffer_align(skb);
+ priv->rx_skb[q][i] = skb;
+ }
+
+ /* Allocate rings for the aligned buffers */
+ priv->tx_align[q] = kmalloc(DPTR_ALIGN * priv->num_tx_ring[q] +
+ DPTR_ALIGN - 1, GFP_KERNEL);
+ if (!priv->tx_align[q])
+ goto error;
+
+ /* Allocate all RX descriptors. */
+ ring_size = sizeof(struct ravb_ex_rx_desc) * (priv->num_rx_ring[q] + 1);
+ priv->rx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size,
+ &priv->rx_desc_dma[q],
+ GFP_KERNEL);
+ if (!priv->rx_ring[q])
+ goto error;
+
+ priv->dirty_rx[q] = 0;
+
+ /* Allocate all TX descriptors. */
+ ring_size = sizeof(struct ravb_tx_desc) *
+ (priv->num_tx_ring[q] * NUM_TX_DESC + 1);
+ priv->tx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size,
+ &priv->tx_desc_dma[q],
+ GFP_KERNEL);
+ if (!priv->tx_ring[q])
+ goto error;
+
+ return 0;
+
+error:
+ ravb_ring_free(ndev, q);
+
+ return -ENOMEM;
+}
+
+/* E-MAC init function */
+static void ravb_emac_init(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ u32 ecmr;
+
+ /* Receive frame limit set register */
+ ravb_write(ndev, ndev->mtu + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN, RFLR);
+
+ /* PAUSE prohibition */
+ ecmr = ravb_read(ndev, ECMR);
+ ecmr &= ECMR_DM;
+ ecmr |= ECMR_ZPF | (priv->duplex ? ECMR_DM : 0) | ECMR_TE | ECMR_RE;
+ ravb_write(ndev, ecmr, ECMR);
+
+ ravb_set_rate(ndev);
+
+ /* Set MAC address */
+ ravb_write(ndev,
+ (ndev->dev_addr[0] << 24) | (ndev->dev_addr[1] << 16) |
+ (ndev->dev_addr[2] << 8) | (ndev->dev_addr[3]), MAHR);
+ ravb_write(ndev,
+ (ndev->dev_addr[4] << 8) | (ndev->dev_addr[5]), MALR);
+
+ ravb_write(ndev, 1, MPR);
+
+ /* E-MAC status register clear */
+ ravb_write(ndev, ECSR_ICD | ECSR_MPD, ECSR);
+
+ /* E-MAC interrupt enable register */
+ ravb_write(ndev, ECSIPR_ICDIP | ECSIPR_MPDIP | ECSIPR_LCHNGIP, ECSIPR);
+}
+
+/* Device init function for Ethernet AVB */
+static int ravb_dmac_init(struct net_device *ndev)
+{
+ int error;
+
+ /* Set CONFIG mode */
+ error = ravb_config(ndev);
+ if (error)
+ return error;
+
+ error = ravb_ring_init(ndev, RAVB_BE);
+ if (error)
+ return error;
+ error = ravb_ring_init(ndev, RAVB_NC);
+ if (error) {
+ ravb_ring_free(ndev, RAVB_BE);
+ return error;
+ }
+
+ /* Descriptor format */
+ ravb_ring_format(ndev, RAVB_BE);
+ ravb_ring_format(ndev, RAVB_NC);
+
+#if defined(__LITTLE_ENDIAN)
+ ravb_write(ndev, ravb_read(ndev, CCC) & ~CCC_BOC, CCC);
+#else
+ ravb_write(ndev, ravb_read(ndev, CCC) | CCC_BOC, CCC);
+#endif
+
+ /* Set AVB RX */
+ ravb_write(ndev, RCR_EFFS | RCR_ENCF | RCR_ETS0 | 0x18000000, RCR);
+
+ /* Set FIFO size */
+ ravb_write(ndev, TGC_TQP_AVBMODE1 | 0x00222200, TGC);
+
+ /* Timestamp enable */
+ ravb_write(ndev, TCCR_TFEN, TCCR);
+
+ /* Interrupt enable: */
+ /* Frame receive */
+ ravb_write(ndev, RIC0_FRE0 | RIC0_FRE1, RIC0);
+ /* Receive FIFO full error, descriptor empty */
+ ravb_write(ndev, RIC2_QFE0 | RIC2_QFE1 | RIC2_RFFE, RIC2);
+ /* Frame transmitted, timestamp FIFO updated */
+ ravb_write(ndev, TIC_FTE0 | TIC_FTE1 | TIC_TFUE, TIC);
+
+ /* Setting the control will start the AVB-DMAC process. */
+ ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) | CCC_OPC_OPERATION,
+ CCC);
+
+ return 0;
+}
+
+/* Free TX skb function for AVB-IP */
+static int ravb_tx_free(struct net_device *ndev, int q)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ struct net_device_stats *stats = &priv->stats[q];
+ struct ravb_tx_desc *desc;
+ int free_num = 0;
+ int entry;
+ u32 size;
+
+ for (; priv->cur_tx[q] - priv->dirty_tx[q] > 0; priv->dirty_tx[q]++) {
+ entry = priv->dirty_tx[q] % (priv->num_tx_ring[q] *
+ NUM_TX_DESC);
+ desc = &priv->tx_ring[q][entry];
+ if (desc->die_dt != DT_FEMPTY)
+ break;
+ /* Descriptor type must be checked before all other reads */
+ dma_rmb();
+ size = le16_to_cpu(desc->ds_tagl) & TX_DS;
+ /* Free the original skb. */
+ if (priv->tx_skb[q][entry / NUM_TX_DESC]) {
+ dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
+ size, DMA_TO_DEVICE);
+ /* Last packet descriptor? */
+ if (entry % NUM_TX_DESC == NUM_TX_DESC - 1) {
+ entry /= NUM_TX_DESC;
+ dev_kfree_skb_any(priv->tx_skb[q][entry]);
+ priv->tx_skb[q][entry] = NULL;
+ stats->tx_packets++;
+ }
+ free_num++;
+ }
+ stats->tx_bytes += size;
+ desc->die_dt = DT_EEMPTY;
+ }
+ return free_num;
+}
+
+static void ravb_get_tx_tstamp(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ struct ravb_tstamp_skb *ts_skb, *ts_skb2;
+ struct skb_shared_hwtstamps shhwtstamps;
+ struct sk_buff *skb;
+ struct timespec64 ts;
+ u16 tag, tfa_tag;
+ int count;
+ u32 tfa2;
+
+ count = (ravb_read(ndev, TSR) & TSR_TFFL) >> 8;
+ while (count--) {
+ tfa2 = ravb_read(ndev, TFA2);
+ tfa_tag = (tfa2 & TFA2_TST) >> 16;
+ ts.tv_nsec = (u64)ravb_read(ndev, TFA0);
+ ts.tv_sec = ((u64)(tfa2 & TFA2_TSV) << 32) |
+ ravb_read(ndev, TFA1);
+ memset(&shhwtstamps, 0, sizeof(shhwtstamps));
+ shhwtstamps.hwtstamp = timespec64_to_ktime(ts);
+ list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list,
+ list) {
+ skb = ts_skb->skb;
+ tag = ts_skb->tag;
+ list_del(&ts_skb->list);
+ kfree(ts_skb);
+ if (tag == tfa_tag) {
+ skb_tstamp_tx(skb, &shhwtstamps);
+ break;
+ }
+ }
+ ravb_write(ndev, ravb_read(ndev, TCCR) | TCCR_TFR, TCCR);
+ }
+}
+
+/* Packet receive function for Ethernet AVB */
+static bool ravb_rx(struct net_device *ndev, int *quota, int q)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ int entry = priv->cur_rx[q] % priv->num_rx_ring[q];
+ int boguscnt = (priv->dirty_rx[q] + priv->num_rx_ring[q]) -
+ priv->cur_rx[q];
+ struct net_device_stats *stats = &priv->stats[q];
+ struct ravb_ex_rx_desc *desc;
+ struct sk_buff *skb;
+ dma_addr_t dma_addr;
+ struct timespec64 ts;
+ u8 desc_status;
+ u16 pkt_len;
+ int limit;
+
+ boguscnt = min(boguscnt, *quota);
+ limit = boguscnt;
+ desc = &priv->rx_ring[q][entry];
+ while (desc->die_dt != DT_FEMPTY) {
+ /* Descriptor type must be checked before all other reads */
+ dma_rmb();
+ desc_status = desc->msc;
+ pkt_len = le16_to_cpu(desc->ds_cc) & RX_DS;
+
+ if (--boguscnt < 0)
+ break;
+
+ /* We use 0-byte descriptors to mark the DMA mapping errors */
+ if (!pkt_len)
+ continue;
+
+ if (desc_status & MSC_MC)
+ stats->multicast++;
+
+ if (desc_status & (MSC_CRC | MSC_RFE | MSC_RTSF | MSC_RTLF |
+ MSC_CEEF)) {
+ stats->rx_errors++;
+ if (desc_status & MSC_CRC)
+ stats->rx_crc_errors++;
+ if (desc_status & MSC_RFE)
+ stats->rx_frame_errors++;
+ if (desc_status & (MSC_RTLF | MSC_RTSF))
+ stats->rx_length_errors++;
+ if (desc_status & MSC_CEEF)
+ stats->rx_missed_errors++;
+ } else {
+ u32 get_ts = priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE;
+
+ skb = priv->rx_skb[q][entry];
+ priv->rx_skb[q][entry] = NULL;
+ dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
+ ALIGN(PKT_BUF_SZ, 16),
+ DMA_FROM_DEVICE);
+ get_ts &= (q == RAVB_NC) ?
+ RAVB_RXTSTAMP_TYPE_V2_L2_EVENT :
+ ~RAVB_RXTSTAMP_TYPE_V2_L2_EVENT;
+ if (get_ts) {
+ struct skb_shared_hwtstamps *shhwtstamps;
+
+ shhwtstamps = skb_hwtstamps(skb);
+ memset(shhwtstamps, 0, sizeof(*shhwtstamps));
+ ts.tv_sec = ((u64) le16_to_cpu(desc->ts_sh) <<
+ 32) | le32_to_cpu(desc->ts_sl);
+ ts.tv_nsec = le32_to_cpu(desc->ts_n);
+ shhwtstamps->hwtstamp = timespec64_to_ktime(ts);
+ }
+ skb_put(skb, pkt_len);
+ skb->protocol = eth_type_trans(skb, ndev);
+ napi_gro_receive(&priv->napi[q], skb);
+ stats->rx_packets++;
+ stats->rx_bytes += pkt_len;
+ }
+
+ entry = (++priv->cur_rx[q]) % priv->num_rx_ring[q];
+ desc = &priv->rx_ring[q][entry];
+ }
+
+ /* Refill the RX ring buffers. */
+ for (; priv->cur_rx[q] - priv->dirty_rx[q] > 0; priv->dirty_rx[q]++) {
+ entry = priv->dirty_rx[q] % priv->num_rx_ring[q];
+ desc = &priv->rx_ring[q][entry];
+ /* The size of the buffer should be on 16-byte boundary. */
+ desc->ds_cc = cpu_to_le16(ALIGN(PKT_BUF_SZ, 16));
+
+ if (!priv->rx_skb[q][entry]) {
+ skb = netdev_alloc_skb(ndev,
+ PKT_BUF_SZ + RAVB_ALIGN - 1);
+ if (!skb)
+ break; /* Better luck next round. */
+ ravb_set_buffer_align(skb);
+ dma_addr = dma_map_single(ndev->dev.parent, skb->data,
+ le16_to_cpu(desc->ds_cc),
+ DMA_FROM_DEVICE);
+ skb_checksum_none_assert(skb);
+ /* We just set the data size to 0 for a failed mapping
+ * which should prevent DMA from happening...
+ */
+ if (dma_mapping_error(ndev->dev.parent, dma_addr))
+ desc->ds_cc = cpu_to_le16(0);
+ desc->dptr = cpu_to_le32(dma_addr);
+ priv->rx_skb[q][entry] = skb;
+ }
+ /* Descriptor type must be set after all the above writes */
+ dma_wmb();
+ desc->die_dt = DT_FEMPTY;
+ }
+
+ *quota -= limit - (++boguscnt);
+
+ return boguscnt <= 0;
+}
+
+static void ravb_rcv_snd_disable(struct net_device *ndev)
+{
+ /* Disable TX and RX */
+ ravb_write(ndev, ravb_read(ndev, ECMR) & ~(ECMR_RE | ECMR_TE), ECMR);
+}
+
+static void ravb_rcv_snd_enable(struct net_device *ndev)
+{
+ /* Enable TX and RX */
+ ravb_write(ndev, ravb_read(ndev, ECMR) | ECMR_RE | ECMR_TE, ECMR);
+}
+
+/* function for waiting dma process finished */
+static int ravb_stop_dma(struct net_device *ndev)
+{
+ int error;
+
+ /* Wait for stopping the hardware TX process */
+ error = ravb_wait(ndev, TCCR,
+ TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, 0);
+ if (error)
+ return error;
+
+ error = ravb_wait(ndev, CSR, CSR_TPO0 | CSR_TPO1 | CSR_TPO2 | CSR_TPO3,
+ 0);
+ if (error)
+ return error;
+
+ /* Stop the E-MAC's RX/TX processes. */
+ ravb_rcv_snd_disable(ndev);
+
+ /* Wait for stopping the RX DMA process */
+ error = ravb_wait(ndev, CSR, CSR_RPO, 0);
+ if (error)
+ return error;
+
+ /* Stop AVB-DMAC process */
+ return ravb_config(ndev);
+}
+
+/* E-MAC interrupt handler */
+static void ravb_emac_interrupt(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ u32 ecsr, psr;
+
+ ecsr = ravb_read(ndev, ECSR);
+ ravb_write(ndev, ecsr, ECSR); /* clear interrupt */
+ if (ecsr & ECSR_ICD)
+ ndev->stats.tx_carrier_errors++;
+ if (ecsr & ECSR_LCHNG) {
+ /* Link changed */
+ if (priv->no_avb_link)
+ return;
+ psr = ravb_read(ndev, PSR);
+ if (priv->avb_link_active_low)
+ psr ^= PSR_LMON;
+ if (!(psr & PSR_LMON)) {
+ /* DIsable RX and TX */
+ ravb_rcv_snd_disable(ndev);
+ } else {
+ /* Enable RX and TX */
+ ravb_rcv_snd_enable(ndev);
+ }
+ }
+}
+
+/* Error interrupt handler */
+static void ravb_error_interrupt(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ u32 eis, ris2;
+
+ eis = ravb_read(ndev, EIS);
+ ravb_write(ndev, ~EIS_QFS, EIS);
+ if (eis & EIS_QFS) {
+ ris2 = ravb_read(ndev, RIS2);
+ ravb_write(ndev, ~(RIS2_QFF0 | RIS2_RFFF), RIS2);
+
+ /* Receive Descriptor Empty int */
+ if (ris2 & RIS2_QFF0)
+ priv->stats[RAVB_BE].rx_over_errors++;
+
+ /* Receive Descriptor Empty int */
+ if (ris2 & RIS2_QFF1)
+ priv->stats[RAVB_NC].rx_over_errors++;
+
+ /* Receive FIFO Overflow int */
+ if (ris2 & RIS2_RFFF)
+ priv->rx_fifo_errors++;
+ }
+}
+
+static irqreturn_t ravb_interrupt(int irq, void *dev_id)
+{
+ struct net_device *ndev = dev_id;
+ struct ravb_private *priv = netdev_priv(ndev);
+ irqreturn_t result = IRQ_NONE;
+ u32 iss;
+
+ spin_lock(&priv->lock);
+ /* Get interrupt status */
+ iss = ravb_read(ndev, ISS);
+
+ /* Received and transmitted interrupts */
+ if (iss & (ISS_FRS | ISS_FTS | ISS_TFUS)) {
+ u32 ris0 = ravb_read(ndev, RIS0);
+ u32 ric0 = ravb_read(ndev, RIC0);
+ u32 tis = ravb_read(ndev, TIS);
+ u32 tic = ravb_read(ndev, TIC);
+ int q;
+
+ /* Timestamp updated */
+ if (tis & TIS_TFUF) {
+ ravb_write(ndev, ~TIS_TFUF, TIS);
+ ravb_get_tx_tstamp(ndev);
+ result = IRQ_HANDLED;
+ }
+
+ /* Network control and best effort queue RX/TX */
+ for (q = RAVB_NC; q >= RAVB_BE; q--) {
+ if (((ris0 & ric0) & BIT(q)) ||
+ ((tis & tic) & BIT(q))) {
+ if (napi_schedule_prep(&priv->napi[q])) {
+ /* Mask RX and TX interrupts */
+ ric0 &= ~BIT(q);
+ tic &= ~BIT(q);
+ ravb_write(ndev, ric0, RIC0);
+ ravb_write(ndev, tic, TIC);
+ __napi_schedule(&priv->napi[q]);
+ } else {
+ netdev_warn(ndev,
+ "ignoring interrupt, rx status 0x%08x, rx mask 0x%08x,\n",
+ ris0, ric0);
+ netdev_warn(ndev,
+ " tx status 0x%08x, tx mask 0x%08x.\n",
+ tis, tic);
+ }
+ result = IRQ_HANDLED;
+ }
+ }
+ }
+
+ /* E-MAC status summary */
+ if (iss & ISS_MS) {
+ ravb_emac_interrupt(ndev);
+ result = IRQ_HANDLED;
+ }
+
+ /* Error status summary */
+ if (iss & ISS_ES) {
+ ravb_error_interrupt(ndev);
+ result = IRQ_HANDLED;
+ }
+
+ if (iss & ISS_CGIS)
+ result = ravb_ptp_interrupt(ndev);
+
+ mmiowb();
+ spin_unlock(&priv->lock);
+ return result;
+}
+
+static int ravb_poll(struct napi_struct *napi, int budget)
+{
+ struct net_device *ndev = napi->dev;
+ struct ravb_private *priv = netdev_priv(ndev);
+ unsigned long flags;
+ int q = napi - priv->napi;
+ int mask = BIT(q);
+ int quota = budget;
+ u32 ris0, tis;
+
+ for (;;) {
+ tis = ravb_read(ndev, TIS);
+ ris0 = ravb_read(ndev, RIS0);
+ if (!((ris0 & mask) || (tis & mask)))
+ break;
+
+ /* Processing RX Descriptor Ring */
+ if (ris0 & mask) {
+ /* Clear RX interrupt */
+ ravb_write(ndev, ~mask, RIS0);
+ if (ravb_rx(ndev, &quota, q))
+ goto out;
+ }
+ /* Processing TX Descriptor Ring */
+ if (tis & mask) {
+ spin_lock_irqsave(&priv->lock, flags);
+ /* Clear TX interrupt */
+ ravb_write(ndev, ~mask, TIS);
+ ravb_tx_free(ndev, q);
+ netif_wake_subqueue(ndev, q);
+ mmiowb();
+ spin_unlock_irqrestore(&priv->lock, flags);
+ }
+ }
+
+ napi_complete(napi);
+
+ /* Re-enable RX/TX interrupts */
+ spin_lock_irqsave(&priv->lock, flags);
+ ravb_write(ndev, ravb_read(ndev, RIC0) | mask, RIC0);
+ ravb_write(ndev, ravb_read(ndev, TIC) | mask, TIC);
+ mmiowb();
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ /* Receive error message handling */
+ priv->rx_over_errors = priv->stats[RAVB_BE].rx_over_errors;
+ priv->rx_over_errors += priv->stats[RAVB_NC].rx_over_errors;
+ if (priv->rx_over_errors != ndev->stats.rx_over_errors) {
+ ndev->stats.rx_over_errors = priv->rx_over_errors;
+ netif_err(priv, rx_err, ndev, "Receive Descriptor Empty\n");
+ }
+ if (priv->rx_fifo_errors != ndev->stats.rx_fifo_errors) {
+ ndev->stats.rx_fifo_errors = priv->rx_fifo_errors;
+ netif_err(priv, rx_err, ndev, "Receive FIFO Overflow\n");
+ }
+out:
+ return budget - quota;
+}
+
+/* PHY state control function */
+static void ravb_adjust_link(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ struct phy_device *phydev = priv->phydev;
+ bool new_state = false;
+
+ if (phydev->link) {
+ if (phydev->duplex != priv->duplex) {
+ new_state = true;
+ priv->duplex = phydev->duplex;
+ ravb_set_duplex(ndev);
+ }
+
+ if (phydev->speed != priv->speed) {
+ new_state = true;
+ priv->speed = phydev->speed;
+ ravb_set_rate(ndev);
+ }
+ if (!priv->link) {
+ ravb_write(ndev, ravb_read(ndev, ECMR) & ~ECMR_TXF,
+ ECMR);
+ new_state = true;
+ priv->link = phydev->link;
+ if (priv->no_avb_link)
+ ravb_rcv_snd_enable(ndev);
+ }
+ } else if (priv->link) {
+ new_state = true;
+ priv->link = 0;
+ priv->speed = 0;
+ priv->duplex = -1;
+ if (priv->no_avb_link)
+ ravb_rcv_snd_disable(ndev);
+ }
+
+ if (new_state && netif_msg_link(priv))
+ phy_print_status(phydev);
+}
+
+/* PHY init function */
+static int ravb_phy_init(struct net_device *ndev)
+{
+ struct device_node *np = ndev->dev.parent->of_node;
+ struct ravb_private *priv = netdev_priv(ndev);
+ struct phy_device *phydev;
+ struct device_node *pn;
+
+ priv->link = 0;
+ priv->speed = 0;
+ priv->duplex = -1;
+
+ /* Try connecting to PHY */
+ pn = of_parse_phandle(np, "phy-handle", 0);
+ phydev = of_phy_connect(ndev, pn, ravb_adjust_link, 0,
+ priv->phy_interface);
+ if (!phydev) {
+ netdev_err(ndev, "failed to connect PHY\n");
+ return -ENOENT;
+ }
+
+ /* This driver only support 10/100Mbit speeds on Gen3
+ * at this time.
+ */
+ if (priv->chip_id == RCAR_GEN3) {
+ int err;
+
+ err = phy_set_max_speed(phydev, SPEED_100);
+ if (err) {
+ netdev_err(ndev, "failed to limit PHY to 100Mbit/s\n");
+ phy_disconnect(phydev);
+ return err;
+ }
+
+ netdev_info(ndev, "limited PHY to 100Mbit/s\n");
+ }
+
+ /* 10BASE is not supported */
+ phydev->supported &= ~PHY_10BT_FEATURES;
+
+ netdev_info(ndev, "attached PHY %d (IRQ %d) to driver %s\n",
+ phydev->addr, phydev->irq, phydev->drv->name);
+
+ priv->phydev = phydev;
+
+ return 0;
+}
+
+/* PHY control start function */
+static int ravb_phy_start(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ int error;
+
+ error = ravb_phy_init(ndev);
+ if (error)
+ return error;
+
+ phy_start(priv->phydev);
+
+ return 0;
+}
+
+static int ravb_get_settings(struct net_device *ndev, struct ethtool_cmd *ecmd)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ int error = -ENODEV;
+ unsigned long flags;
+
+ if (priv->phydev) {
+ spin_lock_irqsave(&priv->lock, flags);
+ error = phy_ethtool_gset(priv->phydev, ecmd);
+ spin_unlock_irqrestore(&priv->lock, flags);
+ }
+
+ return error;
+}
+
+static int ravb_set_settings(struct net_device *ndev, struct ethtool_cmd *ecmd)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ unsigned long flags;
+ int error;
+
+ if (!priv->phydev)
+ return -ENODEV;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ /* Disable TX and RX */
+ ravb_rcv_snd_disable(ndev);
+
+ error = phy_ethtool_sset(priv->phydev, ecmd);
+ if (error)
+ goto error_exit;
+
+ if (ecmd->duplex == DUPLEX_FULL)
+ priv->duplex = 1;
+ else
+ priv->duplex = 0;
+
+ ravb_set_duplex(ndev);
+
+error_exit:
+ mdelay(1);
+
+ /* Enable TX and RX */
+ ravb_rcv_snd_enable(ndev);
+
+ mmiowb();
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return error;
+}
+
+static int ravb_nway_reset(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ int error = -ENODEV;
+ unsigned long flags;
+
+ if (priv->phydev) {
+ spin_lock_irqsave(&priv->lock, flags);
+ error = phy_start_aneg(priv->phydev);
+ spin_unlock_irqrestore(&priv->lock, flags);
+ }
+
+ return error;
+}
+
+static u32 ravb_get_msglevel(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+
+ return priv->msg_enable;
+}
+
+static void ravb_set_msglevel(struct net_device *ndev, u32 value)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+
+ priv->msg_enable = value;
+}
+
+static const char ravb_gstrings_stats[][ETH_GSTRING_LEN] = {
+ "rx_queue_0_current",
+ "tx_queue_0_current",
+ "rx_queue_0_dirty",
+ "tx_queue_0_dirty",
+ "rx_queue_0_packets",
+ "tx_queue_0_packets",
+ "rx_queue_0_bytes",
+ "tx_queue_0_bytes",
+ "rx_queue_0_mcast_packets",
+ "rx_queue_0_errors",
+ "rx_queue_0_crc_errors",
+ "rx_queue_0_frame_errors",
+ "rx_queue_0_length_errors",
+ "rx_queue_0_missed_errors",
+ "rx_queue_0_over_errors",
+
+ "rx_queue_1_current",
+ "tx_queue_1_current",
+ "rx_queue_1_dirty",
+ "tx_queue_1_dirty",
+ "rx_queue_1_packets",
+ "tx_queue_1_packets",
+ "rx_queue_1_bytes",
+ "tx_queue_1_bytes",
+ "rx_queue_1_mcast_packets",
+ "rx_queue_1_errors",
+ "rx_queue_1_crc_errors",
+ "rx_queue_1_frame_errors",
+ "rx_queue_1_length_errors",
+ "rx_queue_1_missed_errors",
+ "rx_queue_1_over_errors",
+};
+
+#define RAVB_STATS_LEN ARRAY_SIZE(ravb_gstrings_stats)
+
+static int ravb_get_sset_count(struct net_device *netdev, int sset)
+{
+ switch (sset) {
+ case ETH_SS_STATS:
+ return RAVB_STATS_LEN;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static void ravb_get_ethtool_stats(struct net_device *ndev,
+ struct ethtool_stats *stats, u64 *data)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ int i = 0;
+ int q;
+
+ /* Device-specific stats */
+ for (q = RAVB_BE; q < NUM_RX_QUEUE; q++) {
+ struct net_device_stats *stats = &priv->stats[q];
+
+ data[i++] = priv->cur_rx[q];
+ data[i++] = priv->cur_tx[q];
+ data[i++] = priv->dirty_rx[q];
+ data[i++] = priv->dirty_tx[q];
+ data[i++] = stats->rx_packets;
+ data[i++] = stats->tx_packets;
+ data[i++] = stats->rx_bytes;
+ data[i++] = stats->tx_bytes;
+ data[i++] = stats->multicast;
+ data[i++] = stats->rx_errors;
+ data[i++] = stats->rx_crc_errors;
+ data[i++] = stats->rx_frame_errors;
+ data[i++] = stats->rx_length_errors;
+ data[i++] = stats->rx_missed_errors;
+ data[i++] = stats->rx_over_errors;
+ }
+}
+
+static void ravb_get_strings(struct net_device *ndev, u32 stringset, u8 *data)
+{
+ switch (stringset) {
+ case ETH_SS_STATS:
+ memcpy(data, *ravb_gstrings_stats, sizeof(ravb_gstrings_stats));
+ break;
+ }
+}
+
+static void ravb_get_ringparam(struct net_device *ndev,
+ struct ethtool_ringparam *ring)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+
+ ring->rx_max_pending = BE_RX_RING_MAX;
+ ring->tx_max_pending = BE_TX_RING_MAX;
+ ring->rx_pending = priv->num_rx_ring[RAVB_BE];
+ ring->tx_pending = priv->num_tx_ring[RAVB_BE];
+}
+
+static int ravb_set_ringparam(struct net_device *ndev,
+ struct ethtool_ringparam *ring)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ int error;
+
+ if (ring->tx_pending > BE_TX_RING_MAX ||
+ ring->rx_pending > BE_RX_RING_MAX ||
+ ring->tx_pending < BE_TX_RING_MIN ||
+ ring->rx_pending < BE_RX_RING_MIN)
+ return -EINVAL;
+ if (ring->rx_mini_pending || ring->rx_jumbo_pending)
+ return -EINVAL;
+
+ if (netif_running(ndev)) {
+ netif_device_detach(ndev);
+ /* Stop PTP Clock driver */
+ ravb_ptp_stop(ndev);
+ /* Wait for DMA stopping */
+ error = ravb_stop_dma(ndev);
+ if (error) {
+ netdev_err(ndev,
+ "cannot set ringparam! Any AVB processes are still running?\n");
+ return error;
+ }
+ synchronize_irq(ndev->irq);
+
+ /* Free all the skb's in the RX queue and the DMA buffers. */
+ ravb_ring_free(ndev, RAVB_BE);
+ ravb_ring_free(ndev, RAVB_NC);
+ }
+
+ /* Set new parameters */
+ priv->num_rx_ring[RAVB_BE] = ring->rx_pending;
+ priv->num_tx_ring[RAVB_BE] = ring->tx_pending;
+
+ if (netif_running(ndev)) {
+ error = ravb_dmac_init(ndev);
+ if (error) {
+ netdev_err(ndev,
+ "%s: ravb_dmac_init() failed, error %d\n",
+ __func__, error);
+ return error;
+ }
+
+ ravb_emac_init(ndev);
+
+ /* Initialise PTP Clock driver */
+ ravb_ptp_init(ndev, priv->pdev);
+
+ netif_device_attach(ndev);
+ }
+
+ return 0;
+}
+
+static int ravb_get_ts_info(struct net_device *ndev,
+ struct ethtool_ts_info *info)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+
+ info->so_timestamping =
+ SOF_TIMESTAMPING_TX_SOFTWARE |
+ SOF_TIMESTAMPING_RX_SOFTWARE |
+ SOF_TIMESTAMPING_SOFTWARE |
+ SOF_TIMESTAMPING_TX_HARDWARE |
+ SOF_TIMESTAMPING_RX_HARDWARE |
+ SOF_TIMESTAMPING_RAW_HARDWARE;
+ info->tx_types = (1 << HWTSTAMP_TX_OFF) | (1 << HWTSTAMP_TX_ON);
+ info->rx_filters =
+ (1 << HWTSTAMP_FILTER_NONE) |
+ (1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
+ (1 << HWTSTAMP_FILTER_ALL);
+ info->phc_index = ptp_clock_index(priv->ptp.clock);
+
+ return 0;
+}
+
+static const struct ethtool_ops ravb_ethtool_ops = {
+ .get_settings = ravb_get_settings,
+ .set_settings = ravb_set_settings,
+ .nway_reset = ravb_nway_reset,
+ .get_msglevel = ravb_get_msglevel,
+ .set_msglevel = ravb_set_msglevel,
+ .get_link = ethtool_op_get_link,
+ .get_strings = ravb_get_strings,
+ .get_ethtool_stats = ravb_get_ethtool_stats,
+ .get_sset_count = ravb_get_sset_count,
+ .get_ringparam = ravb_get_ringparam,
+ .set_ringparam = ravb_set_ringparam,
+ .get_ts_info = ravb_get_ts_info,
+};
+
+/* Network device open function for Ethernet AVB */
+static int ravb_open(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ int error;
+
+ napi_enable(&priv->napi[RAVB_BE]);
+ napi_enable(&priv->napi[RAVB_NC]);
+
+ error = request_irq(ndev->irq, ravb_interrupt, IRQF_SHARED, ndev->name,
+ ndev);
+ if (error) {
+ netdev_err(ndev, "cannot request IRQ\n");
+ goto out_napi_off;
+ }
+
+ if (priv->chip_id == RCAR_GEN3) {
+ error = request_irq(priv->emac_irq, ravb_interrupt,
+ IRQF_SHARED, ndev->name, ndev);
+ if (error) {
+ netdev_err(ndev, "cannot request IRQ\n");
+ goto out_free_irq;
+ }
+ }
+
+ /* Device init */
+ error = ravb_dmac_init(ndev);
+ if (error)
+ goto out_free_irq2;
+ ravb_emac_init(ndev);
+
+ /* Initialise PTP Clock driver */
+ ravb_ptp_init(ndev, priv->pdev);
+
+ netif_tx_start_all_queues(ndev);
+
+ /* PHY control start */
+ error = ravb_phy_start(ndev);
+ if (error)
+ goto out_ptp_stop;
+
+ return 0;
+
+out_ptp_stop:
+ /* Stop PTP Clock driver */
+ ravb_ptp_stop(ndev);
+out_free_irq2:
+ if (priv->chip_id == RCAR_GEN3)
+ free_irq(priv->emac_irq, ndev);
+out_free_irq:
+ free_irq(ndev->irq, ndev);
+out_napi_off:
+ napi_disable(&priv->napi[RAVB_NC]);
+ napi_disable(&priv->napi[RAVB_BE]);
+ return error;
+}
+
+/* Timeout function for Ethernet AVB */
+static void ravb_tx_timeout(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+
+ netif_err(priv, tx_err, ndev,
+ "transmit timed out, status %08x, resetting...\n",
+ ravb_read(ndev, ISS));
+
+ /* tx_errors count up */
+ ndev->stats.tx_errors++;
+
+ schedule_work(&priv->work);
+}
+
+static void ravb_tx_timeout_work(struct work_struct *work)
+{
+ struct ravb_private *priv = container_of(work, struct ravb_private,
+ work);
+ struct net_device *ndev = priv->ndev;
+
+ netif_tx_stop_all_queues(ndev);
+
+ /* Stop PTP Clock driver */
+ ravb_ptp_stop(ndev);
+
+ /* Wait for DMA stopping */
+ ravb_stop_dma(ndev);
+
+ ravb_ring_free(ndev, RAVB_BE);
+ ravb_ring_free(ndev, RAVB_NC);
+
+ /* Device init */
+ ravb_dmac_init(ndev);
+ ravb_emac_init(ndev);
+
+ /* Initialise PTP Clock driver */
+ ravb_ptp_init(ndev, priv->pdev);
+
+ netif_tx_start_all_queues(ndev);
+}
+
+/* Packet transmit function for Ethernet AVB */
+static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ u16 q = skb_get_queue_mapping(skb);
+ struct ravb_tstamp_skb *ts_skb;
+ struct ravb_tx_desc *desc;
+ unsigned long flags;
+ u32 dma_addr;
+ void *buffer;
+ u32 entry;
+ u32 len;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ if (priv->cur_tx[q] - priv->dirty_tx[q] > (priv->num_tx_ring[q] - 1) *
+ NUM_TX_DESC) {
+ netif_err(priv, tx_queued, ndev,
+ "still transmitting with the full ring!\n");
+ netif_stop_subqueue(ndev, q);
+ spin_unlock_irqrestore(&priv->lock, flags);
+ return NETDEV_TX_BUSY;
+ }
+ entry = priv->cur_tx[q] % (priv->num_tx_ring[q] * NUM_TX_DESC);
+ priv->tx_skb[q][entry / NUM_TX_DESC] = skb;
+
+ if (skb_put_padto(skb, ETH_ZLEN))
+ goto drop;
+
+ buffer = PTR_ALIGN(priv->tx_align[q], DPTR_ALIGN) +
+ entry / NUM_TX_DESC * DPTR_ALIGN;
+ len = PTR_ALIGN(skb->data, DPTR_ALIGN) - skb->data;
+ memcpy(buffer, skb->data, len);
+ dma_addr = dma_map_single(ndev->dev.parent, buffer, len, DMA_TO_DEVICE);
+ if (dma_mapping_error(ndev->dev.parent, dma_addr))
+ goto drop;
+
+ desc = &priv->tx_ring[q][entry];
+ desc->ds_tagl = cpu_to_le16(len);
+ desc->dptr = cpu_to_le32(dma_addr);
+
+ buffer = skb->data + len;
+ len = skb->len - len;
+ dma_addr = dma_map_single(ndev->dev.parent, buffer, len, DMA_TO_DEVICE);
+ if (dma_mapping_error(ndev->dev.parent, dma_addr))
+ goto unmap;
+
+ desc++;
+ desc->ds_tagl = cpu_to_le16(len);
+ desc->dptr = cpu_to_le32(dma_addr);
+
+ /* TX timestamp required */
+ if (q == RAVB_NC) {
+ ts_skb = kmalloc(sizeof(*ts_skb), GFP_ATOMIC);
+ if (!ts_skb) {
+ desc--;
+ dma_unmap_single(ndev->dev.parent, dma_addr, len,
+ DMA_TO_DEVICE);
+ goto unmap;
+ }
+ ts_skb->skb = skb;
+ ts_skb->tag = priv->ts_skb_tag++;
+ priv->ts_skb_tag &= 0x3ff;
+ list_add_tail(&ts_skb->list, &priv->ts_skb_list);
+
+ /* TAG and timestamp required flag */
+ skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
+ skb_tx_timestamp(skb);
+ desc->tagh_tsr = (ts_skb->tag >> 4) | TX_TSR;
+ desc->ds_tagl |= le16_to_cpu(ts_skb->tag << 12);
+ }
+
+ /* Descriptor type must be set after all the above writes */
+ dma_wmb();
+ desc->die_dt = DT_FEND;
+ desc--;
+ desc->die_dt = DT_FSTART;
+
+ ravb_write(ndev, ravb_read(ndev, TCCR) | (TCCR_TSRQ0 << q), TCCR);
+
+ priv->cur_tx[q] += NUM_TX_DESC;
+ if (priv->cur_tx[q] - priv->dirty_tx[q] >
+ (priv->num_tx_ring[q] - 1) * NUM_TX_DESC && !ravb_tx_free(ndev, q))
+ netif_stop_subqueue(ndev, q);
+
+exit:
+ mmiowb();
+ spin_unlock_irqrestore(&priv->lock, flags);
+ return NETDEV_TX_OK;
+
+unmap:
+ dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
+ le16_to_cpu(desc->ds_tagl), DMA_TO_DEVICE);
+drop:
+ dev_kfree_skb_any(skb);
+ priv->tx_skb[q][entry / NUM_TX_DESC] = NULL;
+ goto exit;
+}
+
+static u16 ravb_select_queue(struct net_device *ndev, struct sk_buff *skb,
+ void *accel_priv, select_queue_fallback_t fallback)
+{
+ /* If skb needs TX timestamp, it is handled in network control queue */
+ return (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) ? RAVB_NC :
+ RAVB_BE;
+
+}
+
+static struct net_device_stats *ravb_get_stats(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ struct net_device_stats *nstats, *stats0, *stats1;
+
+ nstats = &ndev->stats;
+ stats0 = &priv->stats[RAVB_BE];
+ stats1 = &priv->stats[RAVB_NC];
+
+ nstats->tx_dropped += ravb_read(ndev, TROCR);
+ ravb_write(ndev, 0, TROCR); /* (write clear) */
+ nstats->collisions += ravb_read(ndev, CDCR);
+ ravb_write(ndev, 0, CDCR); /* (write clear) */
+ nstats->tx_carrier_errors += ravb_read(ndev, LCCR);
+ ravb_write(ndev, 0, LCCR); /* (write clear) */
+
+ nstats->tx_carrier_errors += ravb_read(ndev, CERCR);
+ ravb_write(ndev, 0, CERCR); /* (write clear) */
+ nstats->tx_carrier_errors += ravb_read(ndev, CEECR);
+ ravb_write(ndev, 0, CEECR); /* (write clear) */
+
+ nstats->rx_packets = stats0->rx_packets + stats1->rx_packets;
+ nstats->tx_packets = stats0->tx_packets + stats1->tx_packets;
+ nstats->rx_bytes = stats0->rx_bytes + stats1->rx_bytes;
+ nstats->tx_bytes = stats0->tx_bytes + stats1->tx_bytes;
+ nstats->multicast = stats0->multicast + stats1->multicast;
+ nstats->rx_errors = stats0->rx_errors + stats1->rx_errors;
+ nstats->rx_crc_errors = stats0->rx_crc_errors + stats1->rx_crc_errors;
+ nstats->rx_frame_errors =
+ stats0->rx_frame_errors + stats1->rx_frame_errors;
+ nstats->rx_length_errors =
+ stats0->rx_length_errors + stats1->rx_length_errors;
+ nstats->rx_missed_errors =
+ stats0->rx_missed_errors + stats1->rx_missed_errors;
+ nstats->rx_over_errors =
+ stats0->rx_over_errors + stats1->rx_over_errors;
+
+ return nstats;
+}
+
+/* Update promiscuous bit */
+static void ravb_set_rx_mode(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ unsigned long flags;
+ u32 ecmr;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ ecmr = ravb_read(ndev, ECMR);
+ if (ndev->flags & IFF_PROMISC)
+ ecmr |= ECMR_PRM;
+ else
+ ecmr &= ~ECMR_PRM;
+ ravb_write(ndev, ecmr, ECMR);
+ mmiowb();
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+/* Device close function for Ethernet AVB */
+static int ravb_close(struct net_device *ndev)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ struct ravb_tstamp_skb *ts_skb, *ts_skb2;
+
+ netif_tx_stop_all_queues(ndev);
+
+ /* Disable interrupts by clearing the interrupt masks. */
+ ravb_write(ndev, 0, RIC0);
+ ravb_write(ndev, 0, RIC1);
+ ravb_write(ndev, 0, RIC2);
+ ravb_write(ndev, 0, TIC);
+
+ /* Stop PTP Clock driver */
+ ravb_ptp_stop(ndev);
+
+ /* Set the config mode to stop the AVB-DMAC's processes */
+ if (ravb_stop_dma(ndev) < 0)
+ netdev_err(ndev,
+ "device will be stopped after h/w processes are done.\n");
+
+ /* Clear the timestamp list */
+ list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list, list) {
+ list_del(&ts_skb->list);
+ kfree(ts_skb);
+ }
+
+ /* PHY disconnect */
+ if (priv->phydev) {
+ phy_stop(priv->phydev);
+ phy_disconnect(priv->phydev);
+ priv->phydev = NULL;
+ }
+
+ free_irq(ndev->irq, ndev);
+
+ napi_disable(&priv->napi[RAVB_NC]);
+ napi_disable(&priv->napi[RAVB_BE]);
+
+ /* Free all the skb's in the RX queue and the DMA buffers. */
+ ravb_ring_free(ndev, RAVB_BE);
+ ravb_ring_free(ndev, RAVB_NC);
+
+ return 0;
+}
+
+static int ravb_hwtstamp_get(struct net_device *ndev, struct ifreq *req)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ struct hwtstamp_config config;
+
+ config.flags = 0;
+ config.tx_type = priv->tstamp_tx_ctrl ? HWTSTAMP_TX_ON :
+ HWTSTAMP_TX_OFF;
+ if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_V2_L2_EVENT)
+ config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
+ else if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_ALL)
+ config.rx_filter = HWTSTAMP_FILTER_ALL;
+ else
+ config.rx_filter = HWTSTAMP_FILTER_NONE;
+
+ return copy_to_user(req->ifr_data, &config, sizeof(config)) ?
+ -EFAULT : 0;
+}
+
+/* Control hardware time stamping */
+static int ravb_hwtstamp_set(struct net_device *ndev, struct ifreq *req)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ struct hwtstamp_config config;
+ u32 tstamp_rx_ctrl = RAVB_RXTSTAMP_ENABLED;
+ u32 tstamp_tx_ctrl;
+
+ if (copy_from_user(&config, req->ifr_data, sizeof(config)))
+ return -EFAULT;
+
+ /* Reserved for future extensions */
+ if (config.flags)
+ return -EINVAL;
+
+ switch (config.tx_type) {
+ case HWTSTAMP_TX_OFF:
+ tstamp_tx_ctrl = 0;
+ break;
+ case HWTSTAMP_TX_ON:
+ tstamp_tx_ctrl = RAVB_TXTSTAMP_ENABLED;
+ break;
+ default:
+ return -ERANGE;
+ }
+
+ switch (config.rx_filter) {
+ case HWTSTAMP_FILTER_NONE:
+ tstamp_rx_ctrl = 0;
+ break;
+ case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+ tstamp_rx_ctrl |= RAVB_RXTSTAMP_TYPE_V2_L2_EVENT;
+ break;
+ default:
+ config.rx_filter = HWTSTAMP_FILTER_ALL;
+ tstamp_rx_ctrl |= RAVB_RXTSTAMP_TYPE_ALL;
+ }
+
+ priv->tstamp_tx_ctrl = tstamp_tx_ctrl;
+ priv->tstamp_rx_ctrl = tstamp_rx_ctrl;
+
+ return copy_to_user(req->ifr_data, &config, sizeof(config)) ?
+ -EFAULT : 0;
+}
+
+/* ioctl to device function */
+static int ravb_do_ioctl(struct net_device *ndev, struct ifreq *req, int cmd)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ struct phy_device *phydev = priv->phydev;
+
+ if (!netif_running(ndev))
+ return -EINVAL;
+
+ if (!phydev)
+ return -ENODEV;
+
+ switch (cmd) {
+ case SIOCGHWTSTAMP:
+ return ravb_hwtstamp_get(ndev, req);
+ case SIOCSHWTSTAMP:
+ return ravb_hwtstamp_set(ndev, req);
+ }
+
+ return phy_mii_ioctl(phydev, req, cmd);
+}
+
+static const struct net_device_ops ravb_netdev_ops = {
+ .ndo_open = ravb_open,
+ .ndo_stop = ravb_close,
+ .ndo_start_xmit = ravb_start_xmit,
+ .ndo_select_queue = ravb_select_queue,
+ .ndo_get_stats = ravb_get_stats,
+ .ndo_set_rx_mode = ravb_set_rx_mode,
+ .ndo_tx_timeout = ravb_tx_timeout,
+ .ndo_do_ioctl = ravb_do_ioctl,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_change_mtu = eth_change_mtu,
+};
+
+/* MDIO bus init function */
+static int ravb_mdio_init(struct ravb_private *priv)
+{
+ struct platform_device *pdev = priv->pdev;
+ struct device *dev = &pdev->dev;
+ int error;
+
+ /* Bitbang init */
+ priv->mdiobb.ops = &bb_ops;
+
+ /* MII controller setting */
+ priv->mii_bus = alloc_mdio_bitbang(&priv->mdiobb);
+ if (!priv->mii_bus)
+ return -ENOMEM;
+
+ /* Hook up MII support for ethtool */
+ priv->mii_bus->name = "ravb_mii";
+ priv->mii_bus->parent = dev;
+ snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
+ pdev->name, pdev->id);
+
+ /* Register MDIO bus */
+ error = of_mdiobus_register(priv->mii_bus, dev->of_node);
+ if (error)
+ goto out_free_bus;
+
+ return 0;
+
+out_free_bus:
+ free_mdio_bitbang(priv->mii_bus);
+ return error;
+}
+
+/* MDIO bus release function */
+static int ravb_mdio_release(struct ravb_private *priv)
+{
+ /* Unregister mdio bus */
+ mdiobus_unregister(priv->mii_bus);
+
+ /* Free bitbang info */
+ free_mdio_bitbang(priv->mii_bus);
+
+ return 0;
+}
+
+static const struct of_device_id ravb_match_table[] = {
+ { .compatible = "renesas,etheravb-r8a7790", .data = (void *)RCAR_GEN2 },
+ { .compatible = "renesas,etheravb-r8a7794", .data = (void *)RCAR_GEN2 },
+ { .compatible = "renesas,etheravb-r8a7795", .data = (void *)RCAR_GEN3 },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ravb_match_table);
+
+static int ravb_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ const struct of_device_id *match;
+ struct ravb_private *priv;
+ enum ravb_chip_id chip_id;
+ struct net_device *ndev;
+ int error, irq, q;
+ struct resource *res;
+
+ if (!np) {
+ dev_err(&pdev->dev,
+ "this driver is required to be instantiated from device tree\n");
+ return -EINVAL;
+ }
+
+ /* Get base address */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "invalid resource\n");
+ return -EINVAL;
+ }
+
+ ndev = alloc_etherdev_mqs(sizeof(struct ravb_private),
+ NUM_TX_QUEUE, NUM_RX_QUEUE);
+ if (!ndev)
+ return -ENOMEM;
+
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+
+ /* The Ether-specific entries in the device structure. */
+ ndev->base_addr = res->start;
+ ndev->dma = -1;
+
+ match = of_match_device(of_match_ptr(ravb_match_table), &pdev->dev);
+ chip_id = (enum ravb_chip_id)match->data;
+
+ if (chip_id == RCAR_GEN3)
+ irq = platform_get_irq_byname(pdev, "ch22");
+ else
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ error = irq;
+ goto out_release;
+ }
+ ndev->irq = irq;
+
+ SET_NETDEV_DEV(ndev, &pdev->dev);
+
+ priv = netdev_priv(ndev);
+ priv->ndev = ndev;
+ priv->pdev = pdev;
+ priv->num_tx_ring[RAVB_BE] = BE_TX_RING_SIZE;
+ priv->num_rx_ring[RAVB_BE] = BE_RX_RING_SIZE;
+ priv->num_tx_ring[RAVB_NC] = NC_TX_RING_SIZE;
+ priv->num_rx_ring[RAVB_NC] = NC_RX_RING_SIZE;
+ priv->addr = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(priv->addr)) {
+ error = PTR_ERR(priv->addr);
+ goto out_release;
+ }
+
+ spin_lock_init(&priv->lock);
+ INIT_WORK(&priv->work, ravb_tx_timeout_work);
+
+ priv->phy_interface = of_get_phy_mode(np);
+
+ priv->no_avb_link = of_property_read_bool(np, "renesas,no-ether-link");
+ priv->avb_link_active_low =
+ of_property_read_bool(np, "renesas,ether-link-active-low");
+
+ if (chip_id == RCAR_GEN3) {
+ irq = platform_get_irq_byname(pdev, "ch24");
+ if (irq < 0) {
+ error = irq;
+ goto out_release;
+ }
+ priv->emac_irq = irq;
+ }
+
+ priv->chip_id = chip_id;
+
+ /* Set function */
+ ndev->netdev_ops = &ravb_netdev_ops;
+ ndev->ethtool_ops = &ravb_ethtool_ops;
+
+ /* Set AVB config mode */
+ ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) | CCC_OPC_CONFIG,
+ CCC);
+
+ /* Set CSEL value */
+ ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_CSEL) | CCC_CSEL_HPB,
+ CCC);
+
+ /* Set GTI value */
+ ravb_write(ndev, ((1000 << 20) / 130) & GTI_TIV, GTI);
+
+ /* Request GTI loading */
+ ravb_write(ndev, ravb_read(ndev, GCCR) | GCCR_LTI, GCCR);
+
+ /* Allocate descriptor base address table */
+ priv->desc_bat_size = sizeof(struct ravb_desc) * DBAT_ENTRY_NUM;
+ priv->desc_bat = dma_alloc_coherent(ndev->dev.parent, priv->desc_bat_size,
+ &priv->desc_bat_dma, GFP_KERNEL);
+ if (!priv->desc_bat) {
+ dev_err(&pdev->dev,
+ "Cannot allocate desc base address table (size %d bytes)\n",
+ priv->desc_bat_size);
+ error = -ENOMEM;
+ goto out_release;
+ }
+ for (q = RAVB_BE; q < DBAT_ENTRY_NUM; q++)
+ priv->desc_bat[q].die_dt = DT_EOS;
+ ravb_write(ndev, priv->desc_bat_dma, DBAT);
+
+ /* Initialise HW timestamp list */
+ INIT_LIST_HEAD(&priv->ts_skb_list);
+
+ /* Debug message level */
+ priv->msg_enable = RAVB_DEF_MSG_ENABLE;
+
+ /* Read and set MAC address */
+ ravb_read_mac_address(ndev, of_get_mac_address(np));
+ if (!is_valid_ether_addr(ndev->dev_addr)) {
+ dev_warn(&pdev->dev,
+ "no valid MAC address supplied, using a random one\n");
+ eth_hw_addr_random(ndev);
+ }
+
+ /* MDIO bus init */
+ error = ravb_mdio_init(priv);
+ if (error) {
+ dev_err(&pdev->dev, "failed to initialize MDIO\n");
+ goto out_dma_free;
+ }
+
+ netif_napi_add(ndev, &priv->napi[RAVB_BE], ravb_poll, 64);
+ netif_napi_add(ndev, &priv->napi[RAVB_NC], ravb_poll, 64);
+
+ /* Network device register */
+ error = register_netdev(ndev);
+ if (error)
+ goto out_napi_del;
+
+ /* Print device information */
+ netdev_info(ndev, "Base address at %#x, %pM, IRQ %d.\n",
+ (u32)ndev->base_addr, ndev->dev_addr, ndev->irq);
+
+ platform_set_drvdata(pdev, ndev);
+
+ return 0;
+
+out_napi_del:
+ netif_napi_del(&priv->napi[RAVB_NC]);
+ netif_napi_del(&priv->napi[RAVB_BE]);
+ ravb_mdio_release(priv);
+out_dma_free:
+ dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat,
+ priv->desc_bat_dma);
+out_release:
+ if (ndev)
+ free_netdev(ndev);
+
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ return error;
+}
+
+static int ravb_remove(struct platform_device *pdev)
+{
+ struct net_device *ndev = platform_get_drvdata(pdev);
+ struct ravb_private *priv = netdev_priv(ndev);
+
+ dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat,
+ priv->desc_bat_dma);
+ /* Set reset mode */
+ ravb_write(ndev, CCC_OPC_RESET, CCC);
+ pm_runtime_put_sync(&pdev->dev);
+ unregister_netdev(ndev);
+ netif_napi_del(&priv->napi[RAVB_NC]);
+ netif_napi_del(&priv->napi[RAVB_BE]);
+ ravb_mdio_release(priv);
+ pm_runtime_disable(&pdev->dev);
+ free_netdev(ndev);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int ravb_runtime_nop(struct device *dev)
+{
+ /* Runtime PM callback shared between ->runtime_suspend()
+ * and ->runtime_resume(). Simply returns success.
+ *
+ * This driver re-initializes all registers after
+ * pm_runtime_get_sync() anyway so there is no need
+ * to save and restore registers here.
+ */
+ return 0;
+}
+
+static const struct dev_pm_ops ravb_dev_pm_ops = {
+ .runtime_suspend = ravb_runtime_nop,
+ .runtime_resume = ravb_runtime_nop,
+};
+
+#define RAVB_PM_OPS (&ravb_dev_pm_ops)
+#else
+#define RAVB_PM_OPS NULL
+#endif
+
+static struct platform_driver ravb_driver = {
+ .probe = ravb_probe,
+ .remove = ravb_remove,
+ .driver = {
+ .name = "ravb",
+ .pm = RAVB_PM_OPS,
+ .of_match_table = ravb_match_table,
+ },
+};
+
+module_platform_driver(ravb_driver);
+
+MODULE_AUTHOR("Mitsuhiro Kimura, Masaru Nagai");
+MODULE_DESCRIPTION("Renesas Ethernet AVB driver");
+MODULE_LICENSE("GPL v2");