125 lines
3.7 KiB
C
125 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*******************************************************************************
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This is the driver for the MAC 10/100 on-chip Ethernet controller
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currently tested on all the ST boards based on STb7109 and stx7200 SoCs.
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DWC Ether MAC 10/100 Universal version 4.0 has been used for developing
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this code.
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This contains the functions to handle the dma.
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Copyright (C) 2007-2009 STMicroelectronics Ltd
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Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
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*******************************************************************************/
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#include <linux/io.h>
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#include "dwmac100.h"
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#include "dwmac_dma.h"
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static void dwmac100_dma_init(void __iomem *ioaddr,
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struct stmmac_dma_cfg *dma_cfg)
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{
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/* Enable Application Access by writing to DMA CSR0 */
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writel(DMA_BUS_MODE_DEFAULT | (dma_cfg->pbl << DMA_BUS_MODE_PBL_SHIFT),
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ioaddr + DMA_BUS_MODE);
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/* Mask interrupts by writing to CSR7 */
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writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_INTR_ENA);
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}
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static void dwmac100_dma_init_rx(struct stmmac_priv *priv, void __iomem *ioaddr,
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struct stmmac_dma_cfg *dma_cfg,
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dma_addr_t dma_rx_phy, u32 chan)
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{
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/* RX descriptor base addr lists must be written into DMA CSR3 */
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writel(lower_32_bits(dma_rx_phy), ioaddr + DMA_RCV_BASE_ADDR);
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}
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static void dwmac100_dma_init_tx(struct stmmac_priv *priv, void __iomem *ioaddr,
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struct stmmac_dma_cfg *dma_cfg,
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dma_addr_t dma_tx_phy, u32 chan)
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{
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/* TX descriptor base addr lists must be written into DMA CSR4 */
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writel(lower_32_bits(dma_tx_phy), ioaddr + DMA_TX_BASE_ADDR);
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}
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/* Store and Forward capability is not used at all.
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*
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* The transmit threshold can be programmed by setting the TTC bits in the DMA
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* control register.
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*/
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static void dwmac100_dma_operation_mode_tx(struct stmmac_priv *priv,
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void __iomem *ioaddr, int mode,
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u32 channel, int fifosz, u8 qmode)
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{
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u32 csr6 = readl(ioaddr + DMA_CONTROL);
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if (mode <= 32)
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csr6 |= DMA_CONTROL_TTC_32;
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else if (mode <= 64)
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csr6 |= DMA_CONTROL_TTC_64;
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else
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csr6 |= DMA_CONTROL_TTC_128;
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writel(csr6, ioaddr + DMA_CONTROL);
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}
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static void dwmac100_dump_dma_regs(struct stmmac_priv *priv,
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void __iomem *ioaddr, u32 *reg_space)
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{
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int i;
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for (i = 0; i < NUM_DWMAC100_DMA_REGS; i++)
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reg_space[DMA_BUS_MODE / 4 + i] =
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readl(ioaddr + DMA_BUS_MODE + i * 4);
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reg_space[DMA_CUR_TX_BUF_ADDR / 4] =
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readl(ioaddr + DMA_CUR_TX_BUF_ADDR);
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reg_space[DMA_CUR_RX_BUF_ADDR / 4] =
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readl(ioaddr + DMA_CUR_RX_BUF_ADDR);
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}
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/* DMA controller has two counters to track the number of the missed frames. */
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static void dwmac100_dma_diagnostic_fr(struct stmmac_extra_stats *x,
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void __iomem *ioaddr)
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{
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u32 csr8 = readl(ioaddr + DMA_MISSED_FRAME_CTR);
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if (unlikely(csr8)) {
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if (csr8 & DMA_MISSED_FRAME_OVE) {
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x->rx_overflow_cntr += 0x800;
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} else {
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unsigned int ove_cntr;
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ove_cntr = ((csr8 & DMA_MISSED_FRAME_OVE_CNTR) >> 17);
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x->rx_overflow_cntr += ove_cntr;
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}
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if (csr8 & DMA_MISSED_FRAME_OVE_M) {
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x->rx_missed_cntr += 0xffff;
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} else {
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unsigned int miss_f = (csr8 & DMA_MISSED_FRAME_M_CNTR);
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x->rx_missed_cntr += miss_f;
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}
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}
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}
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const struct stmmac_dma_ops dwmac100_dma_ops = {
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.reset = dwmac_dma_reset,
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.init = dwmac100_dma_init,
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.init_rx_chan = dwmac100_dma_init_rx,
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.init_tx_chan = dwmac100_dma_init_tx,
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.dump_regs = dwmac100_dump_dma_regs,
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.dma_tx_mode = dwmac100_dma_operation_mode_tx,
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.dma_diagnostic_fr = dwmac100_dma_diagnostic_fr,
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.enable_dma_transmission = dwmac_enable_dma_transmission,
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.enable_dma_irq = dwmac_enable_dma_irq,
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.disable_dma_irq = dwmac_disable_dma_irq,
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.start_tx = dwmac_dma_start_tx,
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.stop_tx = dwmac_dma_stop_tx,
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.start_rx = dwmac_dma_start_rx,
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.stop_rx = dwmac_dma_stop_rx,
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.dma_interrupt = dwmac_dma_interrupt,
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};
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