> The ethernet frame to be sent to MAC-PHY is converted into multiple > transmit data chunks. A transmit data chunk consists of a 4-byte data > header followed by the transmit data chunk payload. > > The received ethernet frame from the network is converted into multiple > receive data chunks by the MAC-PHY and a receive data chunk consists of > the receive data chunk payload followed by a 4-byte data footer at the > end. > > The MAC-PHY shall support a default data chunk payload size of 64 bytes. > Data chunk payload sizes of 32, 16, or 8 bytes may also be supported. The > data chunk payload is always a multiple of 4 bytes. > > The 4-byte data header occurs at the beginning of each transmit data > chunk on MOSI and the 4-byte data footer occurs at the end of each > receive data chunk on MISO. The data header and footer contain the > information needed to determine the validity and location of the transmit > and receive frame data within the data chunk payload. Ethernet frames > shall be aligned to a 32-bit boundary within the data chunk payload. > > Signed-off-by: Parthiban Veerasooran <Parthiban.Veerasooran@xxxxxxxxxxxxx> > --- > drivers/net/ethernet/oa_tc6.c | 425 +++++++++++++++++++++++++++++++++- > include/linux/oa_tc6.h | 65 +++++- > 2 files changed, 485 insertions(+), 5 deletions(-) > > diff --git a/drivers/net/ethernet/oa_tc6.c b/drivers/net/ethernet/oa_tc6.c > index 65a7317f768d..20138b178185 100644 > --- a/drivers/net/ethernet/oa_tc6.c > +++ b/drivers/net/ethernet/oa_tc6.c > @@ -5,6 +5,7 @@ > * Author: Parthiban Veerasooran <parthiban.veerasooran@xxxxxxxxxxxxx> > */ > > +#include <linux/etherdevice.h> > #include <linux/bitfield.h> > #include <linux/interrupt.h> > #include <linux/oa_tc6.h> > @@ -193,17 +194,224 @@ int oa_tc6_perform_ctrl(struct oa_tc6 *tc6, u32 addr, u32 val[], u8 len, > return ret; > } > > +static u16 oa_tc6_prepare_empty_chunk(struct oa_tc6 *tc6, u8 *buf, u8 cp_count) > +{ > + u32 hdr; > + > + /* Prepare empty chunks used for getting interrupt information or if > + * receive data available. > + */ > + for (u8 i = 0; i < cp_count; i++) { > + hdr = FIELD_PREP(DATA_HDR_DNC, 1); > + hdr |= FIELD_PREP(DATA_HDR_P, oa_tc6_get_parity(hdr)); > + hdr = cpu_to_be32(hdr); > + *(u32 *)&buf[i * (tc6->cps + TC6_HDR_SIZE)] = hdr; > + memset(&buf[TC6_HDR_SIZE + (i * (tc6->cps + TC6_HDR_SIZE))], 0, > + tc6->cps); > + } > + > + return cp_count * (tc6->cps + TC6_HDR_SIZE); > +} > + > +static void oa_tc6_rx_eth_ready(struct oa_tc6 *tc6) > +{ > + struct sk_buff *skb = NULL; Unnecessary initialization for skb. > + > + /* Send the received ethernet packet to network layer */ > + skb = netdev_alloc_skb(tc6->netdev, tc6->rxd_bytes + NET_IP_ALIGN); > + if (!skb) { > + tc6->netdev->stats.rx_dropped++; > + netdev_err(tc6->netdev, "Out of memory for rx'd frame"); > + } else { > + skb_reserve(skb, NET_IP_ALIGN); > + memcpy(skb_put(skb, tc6->rxd_bytes), &tc6->eth_rx_buf[0], > + tc6->rxd_bytes); > + skb->protocol = eth_type_trans(skb, tc6->netdev); > + tc6->netdev->stats.rx_packets++; > + tc6->netdev->stats.rx_bytes += tc6->rxd_bytes; > + netif_rx(skb); netif_rx() may fail, I think it is good to add check and statistics. > + } > +} > + > +static int oa_tc6_process_exst(struct oa_tc6 *tc6) > +{ > + u32 regval; > + int ret; > + > + ret = oa_tc6_read_register(tc6, OA_TC6_STS0, ®val, 1); > + if (ret) { > + netdev_err(tc6->netdev, "STS0 register read failed.\n"); > + return ret; > + } > + if (regval & TXPE) > + netdev_err(tc6->netdev, "Transmit protocol error\n"); > + if (regval & TXBOE) > + netdev_err(tc6->netdev, "Transmit buffer overflow\n"); > + if (regval & TXBUE) > + netdev_err(tc6->netdev, "Transmit buffer underflow\n"); > + if (regval & RXBOE) > + netdev_err(tc6->netdev, "Receive buffer overflow\n"); > + if (regval & LOFE) > + netdev_err(tc6->netdev, "Loss of frame\n"); > + if (regval & HDRE) > + netdev_err(tc6->netdev, "Header error\n"); > + if (regval & TXFCSE) > + netdev_err(tc6->netdev, "Transmit Frame Check Sequence Error\n"); > + ret = oa_tc6_write_register(tc6, OA_TC6_STS0, ®val, 1); > + if (ret) > + netdev_err(tc6->netdev, "STS0 register write failed.\n"); > + return ret; > +} > + > +static int oa_tc6_process_rx_chunks(struct oa_tc6 *tc6, u8 *buf, u16 len) > +{ > + u8 cp_count; > + u8 *payload; > + u32 ftr; > + u16 ebo; > + u16 sbo; > + > + /* Calculate the number of chunks received */ > + cp_count = len / (tc6->cps + TC6_FTR_SIZE); > + > + for (u8 i = 0; i < cp_count; i++) { > + /* Get the footer and payload */ > + ftr = *(u32 *)&buf[tc6->cps + (i * (tc6->cps + TC6_FTR_SIZE))]; > + ftr = be32_to_cpu(ftr); > + payload = &buf[(i * (tc6->cps + TC6_FTR_SIZE))]; > + /* Check for footer parity error */ > + if (oa_tc6_get_parity(ftr)) { > + netdev_err(tc6->netdev, "Footer: Parity error\n"); > + goto err_exit; > + } > + /* If EXST set in the footer then read STS0 register to get the > + * status information. > + */ > + if (FIELD_GET(DATA_FTR_EXST, ftr)) { > + if (oa_tc6_process_exst(tc6)) > + netdev_err(tc6->netdev, "Failed to process EXST\n"); > + goto err_exit; > + } > + if (FIELD_GET(DATA_FTR_HDRB, ftr)) { > + netdev_err(tc6->netdev, "Footer: Received header bad\n"); > + goto err_exit; > + } > + if (!FIELD_GET(DATA_FTR_SYNC, ftr)) { > + netdev_err(tc6->netdev, "Footer: Configuration unsync\n"); > + goto err_exit; > + } > + /* If Frame Drop is set, indicates that the MAC has detected a > + * condition for which the SPI host should drop the received > + * ethernet frame. > + */ > + if (FIELD_GET(DATA_FTR_FD, ftr) && FIELD_GET(DATA_FTR_EV, ftr)) { > + netdev_warn(tc6->netdev, "Footer: Frame drop\n"); > + if (FIELD_GET(DATA_FTR_SV, ftr)) { > + goto start_new_frame; > + } else { > + if (tc6->rx_eth_started) { > + tc6->rxd_bytes = 0; > + tc6->rx_eth_started = false; > + tc6->netdev->stats.rx_dropped++; > + } > + continue; > + } > + } > + /* Check for data valid */ > + if (FIELD_GET(DATA_FTR_DV, ftr)) { > + /* Check whether both start valid and end valid are in a > + * single chunk payload means a single chunk payload may > + * contain an entire ethernet frame. > + */ > + if (FIELD_GET(DATA_FTR_SV, ftr) && > + FIELD_GET(DATA_FTR_EV, ftr)) { > + sbo = FIELD_GET(DATA_FTR_SWO, ftr) * 4; > + ebo = FIELD_GET(DATA_FTR_EBO, ftr) + 1; > + if (ebo <= sbo) { > + memcpy(&tc6->eth_rx_buf[tc6->rxd_bytes], > + &payload[0], ebo); > + tc6->rxd_bytes += ebo; > + oa_tc6_rx_eth_ready(tc6); > + tc6->rxd_bytes = 0; > + memcpy(&tc6->eth_rx_buf[tc6->rxd_bytes], > + &payload[sbo], tc6->cps - sbo); > + tc6->rxd_bytes += (tc6->cps - sbo); > + goto exit; > + } else { > + memcpy(&tc6->eth_rx_buf[tc6->rxd_bytes], > + &payload[sbo], ebo - sbo); > + tc6->rxd_bytes += (ebo - sbo); > + oa_tc6_rx_eth_ready(tc6); > + tc6->rxd_bytes = 0; > + goto exit; > + } > + } > +start_new_frame: > + /* Check for start valid to start capturing the incoming > + * ethernet frame. > + */ > + if (FIELD_GET(DATA_FTR_SV, ftr) && !tc6->rx_eth_started) { > + tc6->rxd_bytes = 0; > + tc6->rx_eth_started = true; > + sbo = FIELD_GET(DATA_FTR_SWO, ftr) * 4; > + memcpy(&tc6->eth_rx_buf[tc6->rxd_bytes], > + &payload[sbo], tc6->cps - sbo); > + tc6->rxd_bytes += (tc6->cps - sbo); > + goto exit; > + } > + > + /* Check for end valid and calculate the copy length */ > + if (tc6->rx_eth_started) { > + if (FIELD_GET(DATA_FTR_EV, ftr)) > + ebo = FIELD_GET(DATA_FTR_EBO, ftr) + 1; > + else > + ebo = tc6->cps; > + > + memcpy(&tc6->eth_rx_buf[tc6->rxd_bytes], > + &payload[0], ebo); > + tc6->rxd_bytes += ebo; > + if (FIELD_GET(DATA_FTR_EV, ftr)) { > + /* If End Valid set then send the > + * received ethernet frame to n/w. > + */ > + oa_tc6_rx_eth_ready(tc6); > + tc6->rxd_bytes = 0; > + tc6->rx_eth_started = false; > + } > + } > + } > + > +exit: > + tc6->txc = FIELD_GET(DATA_FTR_TXC, ftr); > + tc6->rca = FIELD_GET(DATA_FTR_RCA, ftr); > + } > + return FTR_OK; > + > +err_exit: > + if (tc6->rx_eth_started) { > + tc6->rxd_bytes = 0; > + tc6->rx_eth_started = false; > + tc6->netdev->stats.rx_dropped++; > + } > + return FTR_ERR; > +} > + > static int oa_tc6_handler(void *data) > { > struct oa_tc6 *tc6 = data; > + bool txc_wait = false; > + u16 tx_pos = 0; > u32 regval; > + u16 len; > int ret; > > while (likely(!kthread_should_stop())) { > - wait_event_interruptible(tc6->tc6_wq, tc6->int_flag || > + wait_event_interruptible(tc6->tc6_wq, tc6->tx_flag || > + tc6->int_flag || tc6->rca || > kthread_should_stop()); > - if (tc6->int_flag) { > + if (tc6->int_flag && !tc6->reset) { > tc6->int_flag = false; > + tc6->reset = true; > ret = oa_tc6_perform_ctrl(tc6, OA_TC6_STS0, ®val, 1, > false, false); > if (ret) { > @@ -227,10 +435,170 @@ static int oa_tc6_handler(void *data) > complete(&tc6->rst_complete); > } > } > + > + if (tc6->int_flag || tc6->rca) { > + /* If rca is updated from the previous footer then > + * prepare the empty chunks equal to rca and perform > + * SPI transfer to receive the ethernet frame. > + */ > + if (tc6->rca) { > + len = oa_tc6_prepare_empty_chunk(tc6, > + tc6->spi_tx_buf, > + tc6->rca); > + } else { > + /* If there is an interrupt then perform a SPI > + * transfer with a empty chunk to get the > + * details. > + */ > + tc6->int_flag = false; > + len = oa_tc6_prepare_empty_chunk(tc6, > + tc6->spi_tx_buf, > + 1); > + } > + /* Perform SPI transfer */ > + ret = oa_tc6_spi_transfer(tc6->spi, tc6->spi_tx_buf, > + tc6->spi_rx_buf, len); > + if (ret) { > + netdev_err(tc6->netdev, "SPI transfer failed\n"); > + continue; > + } > + /* Process the received chunks to get the ethernet frame > + * or interrupt details. > + */ > + if (oa_tc6_process_rx_chunks(tc6, tc6->spi_rx_buf, len)) > + continue; > + } > + > + /* If there is a tx ethernet frame available */ > + if (tc6->tx_flag || txc_wait) { > + tc6->tx_flag = false; > + txc_wait = false; > + len = 0; > + if (!tc6->txc) { > + /* If there is no txc available to transport the > + * tx ethernet frames then wait for the MAC-PHY > + * interrupt to get the txc availability. > + */ > + txc_wait = true; > + continue; > + } else if (tc6->txc >= tc6->txc_needed) { > + len = tc6->txc_needed * (tc6->cps + TC6_HDR_SIZE); > + } else { > + len = tc6->txc * (tc6->cps + TC6_HDR_SIZE); > + } > + memcpy(&tc6->spi_tx_buf[0], &tc6->eth_tx_buf[tx_pos], > + len); > + ret = oa_tc6_spi_transfer(tc6->spi, tc6->spi_tx_buf, > + tc6->spi_rx_buf, len); > + if (ret) { > + netdev_err(tc6->netdev, "SPI transfer failed\n"); > + continue; > + } > + /* Process the received chunks to get the ethernet frame > + * or status. > + */ > + if (oa_tc6_process_rx_chunks(tc6, tc6->spi_rx_buf, > + len)) { > + /* In case of error while processing rx chunks > + * discard the incomplete tx ethernet frame and > + * resend it. > + */ > + tx_pos = 0; > + tc6->txc_needed = tc6->total_txc_needed; > + } else { > + tx_pos += len; > + tc6->txc_needed = tc6->txc_needed - > + (len / (tc6->cps + TC6_HDR_SIZE)); > + /* If the complete ethernet frame is transmitted > + * then return the skb and update the details to > + * n/w layer. > + */ > + if (!tc6->txc_needed) { > + tc6->netdev->stats.tx_packets++; > + tc6->netdev->stats.tx_bytes += tc6->tx_skb->len; > + dev_kfree_skb(tc6->tx_skb); > + tx_pos = 0; > + tc6->tx_skb = NULL; > + if (netif_queue_stopped(tc6->netdev)) > + netif_wake_queue(tc6->netdev); > + } else if (tc6->txc) { > + /* If txc is available again and updated > + * from the previous footer then perform > + * tx again. > + */ > + tc6->tx_flag = true; > + } else { > + /* If there is no txc then wait for the > + * interrupt to indicate txc > + * availability. > + */ > + txc_wait = true; > + } > + } > + } > } > return 0; > } > > +static void oa_tc6_prepare_tx_chunks(struct oa_tc6 *tc6, u8 *buf, > + struct sk_buff *skb) > +{ > + bool frame_started = false; > + u16 copied_bytes = 0; > + u16 copy_len; > + u32 hdr; > + > + /* Calculate the number tx credit counts needed to transport the tx > + * ethernet frame. > + */ > + tc6->txc_needed = (skb->len / tc6->cps) + ((skb->len % tc6->cps) ? 1 : 0); > + tc6->total_txc_needed = tc6->txc_needed; > + > + for (u8 i = 0; i < tc6->txc_needed; i++) { > + /* Prepare the header for each chunks to be transmitted */ > + hdr = FIELD_PREP(DATA_HDR_DNC, 1) | > + FIELD_PREP(DATA_HDR_DV, 1); > + if (!frame_started) { > + hdr |= FIELD_PREP(DATA_HDR_SV, 1) | > + FIELD_PREP(DATA_HDR_SWO, 0); > + frame_started = true; > + } > + if ((tc6->cps + copied_bytes) >= skb->len) { > + copy_len = skb->len - copied_bytes; > + hdr |= FIELD_PREP(DATA_HDR_EBO, copy_len - 1) | > + FIELD_PREP(DATA_HDR_EV, 1); > + } else { > + copy_len = tc6->cps; > + } > + copied_bytes += copy_len; > + hdr |= FIELD_PREP(DATA_HDR_P, oa_tc6_get_parity(hdr)); > + hdr = cpu_to_be32(hdr); > + *(u32 *)&buf[i * (tc6->cps + TC6_HDR_SIZE)] = hdr; > + /* Copy the ethernet frame in the chunk payload section */ > + memcpy(&buf[TC6_HDR_SIZE + (i * (tc6->cps + TC6_HDR_SIZE))], > + &skb->data[copied_bytes - copy_len], copy_len); > + } > +} > + > +netdev_tx_t oa_tc6_send_eth_pkt(struct oa_tc6 *tc6, struct sk_buff *skb) > +{ > + if (tc6->tx_skb) { > + netif_stop_queue(tc6->netdev); > + return NETDEV_TX_BUSY; > + } > + > + tc6->tx_skb = skb; > + /* Prepare tx chunks using the tx ethernet frame */ > + oa_tc6_prepare_tx_chunks(tc6, tc6->eth_tx_buf, skb); > + > + /* Wake tc6 task to perform tx transfer */ > + tc6->tx_flag = true; > + wake_up_interruptible(&tc6->tc6_wq); > + > + return NETDEV_TX_OK; > +} > +EXPORT_SYMBOL_GPL(oa_tc6_send_eth_pkt); > + > static irqreturn_t macphy_irq(int irq, void *dev_id) > { > struct oa_tc6 *tc6 = dev_id; > @@ -293,6 +661,14 @@ int oa_tc6_configure(struct oa_tc6 *tc6, u8 cps, bool ctrl_prot, bool tx_cut_thr > u32 regval; > int ret; > > + /* Read BUFSTS register to get the current txc and rca. */ > + ret = oa_tc6_read_register(tc6, OA_TC6_BUFSTS, ®val, 1); > + if (ret) > + return ret; > + > + tc6->txc = FIELD_GET(TXC, regval); > + tc6->rca = FIELD_GET(RCA, regval); > + > /* Read and configure the IMASK0 register for unmasking the interrupts */ > ret = oa_tc6_read_register(tc6, OA_TC6_IMASK0, ®val, 1); > if (ret) > @@ -326,7 +702,7 @@ int oa_tc6_configure(struct oa_tc6 *tc6, u8 cps, bool ctrl_prot, bool tx_cut_thr > } > EXPORT_SYMBOL_GPL(oa_tc6_configure); > > -struct oa_tc6 *oa_tc6_init(struct spi_device *spi) > +struct oa_tc6 *oa_tc6_init(struct spi_device *spi, struct net_device *netdev) > { > struct oa_tc6 *tc6; > int ret; > @@ -334,11 +710,39 @@ struct oa_tc6 *oa_tc6_init(struct spi_device *spi) > if (!spi) > return NULL; > > + if (!netdev) > + return NULL; > + > tc6 = kzalloc(sizeof(*tc6), GFP_KERNEL); > if (!tc6) > return NULL; > > tc6->spi = spi; > + tc6->netdev = netdev; > + > + /* Allocate memory for the tx buffer used for SPI transfer. */ > + tc6->spi_tx_buf = kzalloc(MAX_ETH_LEN + (OA_TC6_MAX_CPS * TC6_HDR_SIZE), > + GFP_KERNEL); > + if (!tc6->spi_tx_buf) > + goto err_spi_tx_buf_alloc; > + > + /* Allocate memory for the rx buffer used for SPI transfer. */ > + tc6->spi_rx_buf = kzalloc(MAX_ETH_LEN + (OA_TC6_MAX_CPS * TC6_FTR_SIZE), > + GFP_KERNEL); > + if (!tc6->spi_rx_buf) > + goto err_spi_rx_buf_alloc; > + > + /* Allocate memory for the tx ethernet chunks to transfer on SPI. */ > + tc6->eth_tx_buf = kzalloc(MAX_ETH_LEN + (OA_TC6_MAX_CPS * TC6_HDR_SIZE), > + GFP_KERNEL); > + if (!tc6->eth_tx_buf) > + goto err_eth_tx_buf_alloc; > + > + /* Allocate memory for the rx ethernet packet. */ > + tc6->eth_rx_buf = kzalloc(MAX_ETH_LEN + (OA_TC6_MAX_CPS * TC6_FTR_SIZE), > + GFP_KERNEL); > + if (!tc6->eth_rx_buf) > + goto err_eth_rx_buf_alloc; > > /* Used for triggering the OA TC6 task */ > init_waitqueue_head(&tc6->tc6_wq); > @@ -372,6 +776,14 @@ struct oa_tc6 *oa_tc6_init(struct spi_device *spi) > err_macphy_irq: > kthread_stop(tc6->tc6_task); > err_tc6_task: > + kfree(tc6->eth_rx_buf); > +err_eth_rx_buf_alloc: > + kfree(tc6->eth_tx_buf); > +err_eth_tx_buf_alloc: > + kfree(tc6->spi_rx_buf); > +err_spi_rx_buf_alloc: > + kfree(tc6->spi_tx_buf); > +err_spi_tx_buf_alloc: > kfree(tc6); > return NULL; > } > @@ -383,8 +795,13 @@ int oa_tc6_deinit(struct oa_tc6 *tc6) > > devm_free_irq(&tc6->spi->dev, tc6->spi->irq, tc6); > ret = kthread_stop(tc6->tc6_task); > - if (!ret) > + if (!ret) { > + kfree(tc6->eth_rx_buf); > + kfree(tc6->eth_tx_buf); > + kfree(tc6->spi_rx_buf); > + kfree(tc6->spi_tx_buf); > kfree(tc6); > + } > return ret; > } > EXPORT_SYMBOL_GPL(oa_tc6_deinit); > diff --git a/include/linux/oa_tc6.h b/include/linux/oa_tc6.h > index fa29c4e09720..61ac1cdfa7d6 100644 > --- a/include/linux/oa_tc6.h > +++ b/include/linux/oa_tc6.h > @@ -6,6 +6,7 @@ > */ > > #include <linux/spi/spi.h> > +#include <linux/netdevice.h> > > /* Control header */ > #define CTRL_HDR_DNC BIT(31) /* Data-Not-Control */ > @@ -17,10 +18,36 @@ > #define CTRL_HDR_LEN GENMASK(7, 1) /* Length */ > #define CTRL_HDR_P BIT(0) /* Parity Bit */ > > +/* Data header */ > +#define DATA_HDR_DNC BIT(31) /* Data-Not-Control */ > +#define DATA_HDR_SEQ BIT(30) /* Data Chunk Sequence */ > +#define DATA_HDR_NORX BIT(29) /* No Receive */ > +#define DATA_HDR_DV BIT(21) /* Data Valid */ > +#define DATA_HDR_SV BIT(20) /* Start Valid */ > +#define DATA_HDR_SWO GENMASK(19, 16) /* Start Word Offset */ > +#define DATA_HDR_EV BIT(14) /* End Valid */ > +#define DATA_HDR_EBO GENMASK(13, 8) /* End Byte Offset */ > +#define DATA_HDR_P BIT(0) /* Header Parity Bit */ > + > +/* Data footer */ > +#define DATA_FTR_EXST BIT(31) /* Extended Status */ > +#define DATA_FTR_HDRB BIT(30) /* Received Header Bad */ > +#define DATA_FTR_SYNC BIT(29) /* Configuration Synchronized */ > +#define DATA_FTR_RCA GENMASK(28, 24) /* Receive Chunks Available */ > +#define DATA_FTR_DV BIT(21) /* Data Valid */ > +#define DATA_FTR_SV BIT(20) /* Start Valid */ > +#define DATA_FTR_SWO GENMASK(19, 16) /* Start Word Offset */ > +#define DATA_FTR_FD BIT(15) /* Frame Drop */ > +#define DATA_FTR_EV BIT(14) /* End Valid */ > +#define DATA_FTR_EBO GENMASK(13, 8) /* End Byte Offset */ > +#define DATA_FTR_TXC GENMASK(5, 1) /* Transmit Credits */ > +#define DATA_FTR_P BIT(0) /* Footer Parity Bit */ > + > /* Open Alliance TC6 Standard Control and Status Registers */ > #define OA_TC6_RESET 0x0003 /* Reset Control and Status Register */ > #define OA_TC6_CONFIG0 0x0004 /* Configuration Register #0 */ > #define OA_TC6_STS0 0x0008 /* Status Register #0 */ > +#define OA_TC6_BUFSTS 0x000B /* Buffer Status Register */ > #define OA_TC6_IMASK0 0x000C /* Interrupt Mask Register #0 */ > > /* RESET register field */ > @@ -33,6 +60,17 @@ > #define PROTE BIT(5) /* Ctrl read/write Protection Enable */ > #define CPS GENMASK(2, 0) /* Chunk Payload Size */ > > +/* STATUS0 register fields */ > +#define CDPE BIT(12) /* Control Data Protection Error */ > +#define TXFCSE BIT(11) /* Transmit Frame Check Sequence Error */ > +#define RESETC BIT(6) /* Reset Complete */ > +#define HDRE BIT(5) /* Header Error */ > +#define LOFE BIT(4) /* Loss of Framing Error */ > +#define RXBOE BIT(3) /* Receive Buffer Overflow Error */ > +#define TXBUE BIT(2) /* Transmit Buffer Underflow Error */ > +#define TXBOE BIT(1) /* Transmit Buffer Overflow Error */ > +#define TXPE BIT(0) /* Transmit Protocol Error */ > + > /* Unmasking interrupt fields in IMASK0 */ > #define HDREM ~BIT(5) /* Header Error Mask */ > #define LOFEM ~BIT(4) /* Loss of Framing Error Mask */ > @@ -44,24 +82,49 @@ > /* STATUS0 register field */ > #define RESETC BIT(6) /* Reset Complete */ > > +/* BUFSTS register fields */ > +#define TXC GENMASK(15, 8) /* Transmit Credits Available */ > +#define RCA GENMASK(7, 0) /* Receive Chunks Available */ > + > #define TC6_HDR_SIZE 4 /* Ctrl command header size as per OA */ > #define TC6_FTR_SIZE 4 /* Ctrl command footer size ss per OA */ > > +#define FTR_OK 0 > +#define FTR_ERR 1 > + > +#define MAX_ETH_LEN 1536 > +#define OA_TC6_MAX_CPS 64 > + > struct oa_tc6 { > struct completion rst_complete; > struct task_struct *tc6_task; > + struct net_device *netdev; > wait_queue_head_t tc6_wq; > struct spi_device *spi; > + struct sk_buff *tx_skb; > + u8 total_txc_needed; > + bool rx_eth_started; > bool tx_cut_thr; > bool rx_cut_thr; > bool ctrl_prot; > + u8 *spi_tx_buf; > + u8 *spi_rx_buf; > + u8 *eth_tx_buf; > + u8 *eth_rx_buf; > bool int_flag; > + u16 rxd_bytes; > + u8 txc_needed; > + bool tx_flag; > + bool reset; > u8 cps; > + u8 txc; > + u8 rca; > }; > > -struct oa_tc6 *oa_tc6_init(struct spi_device *spi); > +struct oa_tc6 *oa_tc6_init(struct spi_device *spi, struct net_device *netdev); > int oa_tc6_deinit(struct oa_tc6 *tc6); > int oa_tc6_write_register(struct oa_tc6 *tc6, u32 addr, u32 value[], u8 len); > int oa_tc6_read_register(struct oa_tc6 *tc6, u32 addr, u32 value[], u8 len); > int oa_tc6_configure(struct oa_tc6 *tc6, u8 cps, bool ctrl_prot, bool tx_cut_thr, > bool rx_cut_thr); > +netdev_tx_t oa_tc6_send_eth_pkt(struct oa_tc6 *tc6, struct sk_buff *skb); >