diff options
Diffstat (limited to 'drivers/net/ethernet/altera/altera_msgdma.c')
| -rw-r--r-- | drivers/net/ethernet/altera/altera_msgdma.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/drivers/net/ethernet/altera/altera_msgdma.c b/drivers/net/ethernet/altera/altera_msgdma.c new file mode 100644 index 000000000000..4d1f2fdd5c32 --- /dev/null +++ b/drivers/net/ethernet/altera/altera_msgdma.c @@ -0,0 +1,206 @@ +/* Altera TSE SGDMA and MSGDMA Linux driver + * Copyright (C) 2014 Altera Corporation. All rights reserved + * + * 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. + * + * This program is distributed in the hope 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 <linux/netdevice.h> +#include "altera_utils.h" +#include "altera_tse.h" +#include "altera_msgdmahw.h" +#include "altera_msgdma.h" + +/* No initialization work to do for MSGDMA */ +int msgdma_initialize(struct altera_tse_private *priv) +{ + return 0; +} + +void msgdma_uninitialize(struct altera_tse_private *priv) +{ +} + +void msgdma_start_rxdma(struct altera_tse_private *priv) +{ +} + +void msgdma_reset(struct altera_tse_private *priv) +{ + int counter; + struct msgdma_csr *txcsr = + (struct msgdma_csr *)priv->tx_dma_csr; + struct msgdma_csr *rxcsr = + (struct msgdma_csr *)priv->rx_dma_csr; + + /* Reset Rx mSGDMA */ + iowrite32(MSGDMA_CSR_STAT_MASK, &rxcsr->status); + iowrite32(MSGDMA_CSR_CTL_RESET, &rxcsr->control); + + counter = 0; + while (counter++ < ALTERA_TSE_SW_RESET_WATCHDOG_CNTR) { + if (tse_bit_is_clear(&rxcsr->status, + MSGDMA_CSR_STAT_RESETTING)) + break; + udelay(1); + } + + if (counter >= ALTERA_TSE_SW_RESET_WATCHDOG_CNTR) + netif_warn(priv, drv, priv->dev, + "TSE Rx mSGDMA resetting bit never cleared!\n"); + + /* clear all status bits */ + iowrite32(MSGDMA_CSR_STAT_MASK, &rxcsr->status); + + /* Reset Tx mSGDMA */ + iowrite32(MSGDMA_CSR_STAT_MASK, &txcsr->status); + iowrite32(MSGDMA_CSR_CTL_RESET, &txcsr->control); + + counter = 0; + while (counter++ < ALTERA_TSE_SW_RESET_WATCHDOG_CNTR) { + if (tse_bit_is_clear(&txcsr->status, + MSGDMA_CSR_STAT_RESETTING)) + break; + udelay(1); + } + + if (counter >= ALTERA_TSE_SW_RESET_WATCHDOG_CNTR) + netif_warn(priv, drv, priv->dev, + "TSE Tx mSGDMA resetting bit never cleared!\n"); + + /* clear all status bits */ + iowrite32(MSGDMA_CSR_STAT_MASK, &txcsr->status); +} + +void msgdma_disable_rxirq(struct altera_tse_private *priv) +{ + struct msgdma_csr *csr = priv->rx_dma_csr; + tse_clear_bit(&csr->control, MSGDMA_CSR_CTL_GLOBAL_INTR); +} + +void msgdma_enable_rxirq(struct altera_tse_private *priv) +{ + struct msgdma_csr *csr = priv->rx_dma_csr; + tse_set_bit(&csr->control, MSGDMA_CSR_CTL_GLOBAL_INTR); +} + +void msgdma_disable_txirq(struct altera_tse_private *priv) +{ + struct msgdma_csr *csr = priv->tx_dma_csr; + tse_clear_bit(&csr->control, MSGDMA_CSR_CTL_GLOBAL_INTR); +} + +void msgdma_enable_txirq(struct altera_tse_private *priv) +{ + struct msgdma_csr *csr = priv->tx_dma_csr; + tse_set_bit(&csr->control, MSGDMA_CSR_CTL_GLOBAL_INTR); +} + +void msgdma_clear_rxirq(struct altera_tse_private *priv) +{ + struct msgdma_csr *csr = priv->rx_dma_csr; + iowrite32(MSGDMA_CSR_STAT_IRQ, &csr->status); +} + +void msgdma_clear_txirq(struct altera_tse_private *priv) +{ + struct msgdma_csr *csr = priv->tx_dma_csr; + iowrite32(MSGDMA_CSR_STAT_IRQ, &csr->status); +} + +/* return 0 to indicate transmit is pending */ +int msgdma_tx_buffer(struct altera_tse_private *priv, struct tse_buffer *buffer) +{ + struct msgdma_extended_desc *desc = priv->tx_dma_desc; + + iowrite32(lower_32_bits(buffer->dma_addr), &desc->read_addr_lo); + iowrite32(upper_32_bits(buffer->dma_addr), &desc->read_addr_hi); + iowrite32(0, &desc->write_addr_lo); + iowrite32(0, &desc->write_addr_hi); + iowrite32(buffer->len, &desc->len); + iowrite32(0, &desc->burst_seq_num); + iowrite32(MSGDMA_DESC_TX_STRIDE, &desc->stride); + iowrite32(MSGDMA_DESC_CTL_TX_SINGLE, &desc->control); + return 0; +} + +u32 msgdma_tx_completions(struct altera_tse_private *priv) +{ + u32 ready = 0; + u32 inuse; + u32 status; + struct msgdma_csr *txcsr = + (struct msgdma_csr *)priv->tx_dma_csr; + + /* Get number of sent descriptors */ + inuse = ioread32(&txcsr->rw_fill_level) & 0xffff; + + if (inuse) { /* Tx FIFO is not empty */ + ready = priv->tx_prod - priv->tx_cons - inuse - 1; + } else { + /* Check for buffered last packet */ + status = ioread32(&txcsr->status); + if (status & MSGDMA_CSR_STAT_BUSY) + ready = priv->tx_prod - priv->tx_cons - 1; + else + ready = priv->tx_prod - priv->tx_cons; + } + return ready; +} + +/* Put buffer to the mSGDMA RX FIFO + */ +void msgdma_add_rx_desc(struct altera_tse_private *priv, + struct tse_buffer *rxbuffer) +{ + struct msgdma_extended_desc *desc = priv->rx_dma_desc; + u32 len = priv->rx_dma_buf_sz; + dma_addr_t dma_addr = rxbuffer->dma_addr; + u32 control = (MSGDMA_DESC_CTL_END_ON_EOP + | MSGDMA_DESC_CTL_END_ON_LEN + | MSGDMA_DESC_CTL_TR_COMP_IRQ + | MSGDMA_DESC_CTL_EARLY_IRQ + | MSGDMA_DESC_CTL_TR_ERR_IRQ + | MSGDMA_DESC_CTL_GO); + + iowrite32(0, &desc->read_addr_lo); + iowrite32(0, &desc->read_addr_hi); + iowrite32(lower_32_bits(dma_addr), &desc->write_addr_lo); + iowrite32(upper_32_bits(dma_addr), &desc->write_addr_hi); + iowrite32(len, &desc->len); + iowrite32(0, &desc->burst_seq_num); + iowrite32(0x00010001, &desc->stride); + iowrite32(control, &desc->control); +} + +/* status is returned on upper 16 bits, + * length is returned in lower 16 bits + */ +u32 msgdma_rx_status(struct altera_tse_private *priv) +{ + u32 rxstatus = 0; + u32 pktlength; + u32 pktstatus; + struct msgdma_csr *rxcsr = + (struct msgdma_csr *)priv->rx_dma_csr; + struct msgdma_response *rxresp = + (struct msgdma_response *)priv->rx_dma_resp; + + if (ioread32(&rxcsr->resp_fill_level) & 0xffff) { + pktlength = ioread32(&rxresp->bytes_transferred); + pktstatus = ioread32(&rxresp->status); + rxstatus = pktstatus; + rxstatus = rxstatus << 16; + rxstatus |= (pktlength & 0xffff); + } + return rxstatus; +} |