// SPDX-License-Identifier: GPL-2.0-only /******************************************************************************* This is the driver for the GMAC on-chip Ethernet controller for ST SoCs. DWC Ether MAC 10/100/1000 Universal version 3.41a has been used for developing this code. This contains the functions to handle the dma. Copyright (C) 2007-2009 STMicroelectronics Ltd Author: Giuseppe Cavallaro *******************************************************************************/ #include #include "dwmac1000.h" #include "dwmac_dma.h" static void dwmac1000_dma_axi(void __iomem *ioaddr, struct stmmac_axi *axi) { u32 value = readl(ioaddr + DMA_AXI_BUS_MODE); int i; pr_info("dwmac1000: Master AXI performs %s burst length\n", !(value & DMA_AXI_UNDEF) ? "fixed" : "any"); if (axi->axi_lpi_en) value |= DMA_AXI_EN_LPI; if (axi->axi_xit_frm) value |= DMA_AXI_LPI_XIT_FRM; value &= ~DMA_AXI_WR_OSR_LMT; value |= (axi->axi_wr_osr_lmt & DMA_AXI_WR_OSR_LMT_MASK) << DMA_AXI_WR_OSR_LMT_SHIFT; value &= ~DMA_AXI_RD_OSR_LMT; value |= (axi->axi_rd_osr_lmt & DMA_AXI_RD_OSR_LMT_MASK) << DMA_AXI_RD_OSR_LMT_SHIFT; /* Depending on the UNDEF bit the Master AXI will perform any burst * length according to the BLEN programmed (by default all BLEN are * set). */ for (i = 0; i < AXI_BLEN; i++) { switch (axi->axi_blen[i]) { case 256: value |= DMA_AXI_BLEN256; break; case 128: value |= DMA_AXI_BLEN128; break; case 64: value |= DMA_AXI_BLEN64; break; case 32: value |= DMA_AXI_BLEN32; break; case 16: value |= DMA_AXI_BLEN16; break; case 8: value |= DMA_AXI_BLEN8; break; case 4: value |= DMA_AXI_BLEN4; break; } } writel(value, ioaddr + DMA_AXI_BUS_MODE); } static void dwmac1000_dma_init_channel(struct stmmac_priv *priv, void __iomem *ioaddr, struct stmmac_dma_cfg *dma_cfg, u32 chan) { int txpbl = dma_cfg->txpbl ?: dma_cfg->pbl; int rxpbl = dma_cfg->rxpbl ?: dma_cfg->pbl; u32 value; value = readl(ioaddr + DMA_CHAN_BUS_MODE(chan)); /* Set the DMA PBL (Programmable Burst Length) mode. * * Note: before stmmac core 3.50 this mode bit was 4xPBL, and * post 3.5 mode bit acts as 8*PBL. */ if (dma_cfg->pblx8) value |= DMA_BUS_MODE_MAXPBL; value |= DMA_BUS_MODE_USP; value &= ~(DMA_BUS_MODE_PBL_MASK | DMA_BUS_MODE_RPBL_MASK); value |= (txpbl << DMA_BUS_MODE_PBL_SHIFT); value |= (rxpbl << DMA_BUS_MODE_RPBL_SHIFT); /* Set the Fixed burst mode */ if (dma_cfg->fixed_burst) value |= DMA_BUS_MODE_FB; /* Mixed Burst has no effect when fb is set */ if (dma_cfg->mixed_burst) value |= DMA_BUS_MODE_MB; if (dma_cfg->atds) value |= DMA_BUS_MODE_ATDS; if (dma_cfg->aal) value |= DMA_BUS_MODE_AAL; writel(value, ioaddr + DMA_CHAN_BUS_MODE(chan)); /* Mask interrupts by writing to CSR7 */ writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_CHAN_INTR_ENA(chan)); } static void dwmac1000_dma_init_rx(struct stmmac_priv *priv, void __iomem *ioaddr, struct stmmac_dma_cfg *dma_cfg, dma_addr_t dma_rx_phy, u32 chan) { /* RX descriptor base address list must be written into DMA CSR3 */ writel(lower_32_bits(dma_rx_phy), ioaddr + DMA_CHAN_RCV_BASE_ADDR(chan)); } static void dwmac1000_dma_init_tx(struct stmmac_priv *priv, void __iomem *ioaddr, struct stmmac_dma_cfg *dma_cfg, dma_addr_t dma_tx_phy, u32 chan) { /* TX descriptor base address list must be written into DMA CSR4 */ writel(lower_32_bits(dma_tx_phy), ioaddr + DMA_CHAN_TX_BASE_ADDR(chan)); } static u32 dwmac1000_configure_fc(u32 csr6, int rxfifosz) { csr6 &= ~DMA_CONTROL_RFA_MASK; csr6 &= ~DMA_CONTROL_RFD_MASK; /* Leave flow control disabled if receive fifo size is less than * 4K or 0. Otherwise, send XOFF when fifo is 1K less than full, * and send XON when 2K less than full. */ if (rxfifosz < 4096) { csr6 &= ~DMA_CONTROL_EFC; pr_debug("GMAC: disabling flow control, rxfifo too small(%d)\n", rxfifosz); } else { csr6 |= DMA_CONTROL_EFC; csr6 |= RFA_FULL_MINUS_1K; csr6 |= RFD_FULL_MINUS_2K; } return csr6; } static void dwmac1000_dma_operation_mode_rx(struct stmmac_priv *priv, void __iomem *ioaddr, int mode, u32 channel, int fifosz, u8 qmode) { u32 csr6 = readl(ioaddr + DMA_CHAN_CONTROL(channel)); if (mode == SF_DMA_MODE) { pr_debug("GMAC: enable RX store and forward mode\n"); csr6 |= DMA_CONTROL_RSF; } else { pr_debug("GMAC: disable RX SF mode (threshold %d)\n", mode); csr6 &= ~DMA_CONTROL_RSF; csr6 &= DMA_CONTROL_TC_RX_MASK; if (mode <= 32) csr6 |= DMA_CONTROL_RTC_32; else if (mode <= 64) csr6 |= DMA_CONTROL_RTC_64; else if (mode <= 96) csr6 |= DMA_CONTROL_RTC_96; else csr6 |= DMA_CONTROL_RTC_128; } /* Configure flow control based on rx fifo size */ csr6 = dwmac1000_configure_fc(csr6, fifosz); writel(csr6, ioaddr + DMA_CHAN_CONTROL(channel)); } static void dwmac1000_dma_operation_mode_tx(struct stmmac_priv *priv, void __iomem *ioaddr, int mode, u32 channel, int fifosz, u8 qmode) { u32 csr6 = readl(ioaddr + DMA_CHAN_CONTROL(channel)); if (mode == SF_DMA_MODE) { pr_debug("GMAC: enable TX store and forward mode\n"); /* Transmit COE type 2 cannot be done in cut-through mode. */ csr6 |= DMA_CONTROL_TSF; /* Operating on second frame increase the performance * especially when transmit store-and-forward is used. */ csr6 |= DMA_CONTROL_OSF; } else { pr_debug("GMAC: disabling TX SF (threshold %d)\n", mode); csr6 &= ~DMA_CONTROL_TSF; csr6 &= DMA_CONTROL_TC_TX_MASK; /* Set the transmit threshold */ if (mode <= 32) csr6 |= DMA_CONTROL_TTC_32; else if (mode <= 64) csr6 |= DMA_CONTROL_TTC_64; else if (mode <= 128) csr6 |= DMA_CONTROL_TTC_128; else if (mode <= 192) csr6 |= DMA_CONTROL_TTC_192; else csr6 |= DMA_CONTROL_TTC_256; } writel(csr6, ioaddr + DMA_CHAN_CONTROL(channel)); } static void dwmac1000_dump_dma_regs(struct stmmac_priv *priv, void __iomem *ioaddr, u32 *reg_space) { int i; for (i = 0; i < NUM_DWMAC1000_DMA_REGS; i++) if ((i < 12) || (i > 17)) reg_space[DMA_BUS_MODE / 4 + i] = readl(ioaddr + DMA_BUS_MODE + i * 4); } static int dwmac1000_get_hw_feature(void __iomem *ioaddr, struct dma_features *dma_cap) { u32 hw_cap = readl(ioaddr + DMA_HW_FEATURE); if (!hw_cap) { /* 0x00000000 is the value read on old hardware that does not * implement this register */ return -EOPNOTSUPP; } dma_cap->mbps_10_100 = (hw_cap & DMA_HW_FEAT_MIISEL); dma_cap->mbps_1000 = (hw_cap & DMA_HW_FEAT_GMIISEL) >> 1; dma_cap->half_duplex = (hw_cap & DMA_HW_FEAT_HDSEL) >> 2; dma_cap->hash_filter = (hw_cap & DMA_HW_FEAT_HASHSEL) >> 4; dma_cap->multi_addr = (hw_cap & DMA_HW_FEAT_ADDMAC) >> 5; dma_cap->pcs = (hw_cap & DMA_HW_FEAT_PCSSEL) >> 6; dma_cap->sma_mdio = (hw_cap & DMA_HW_FEAT_SMASEL) >> 8; dma_cap->pmt_remote_wake_up = (hw_cap & DMA_HW_FEAT_RWKSEL) >> 9; dma_cap->pmt_magic_frame = (hw_cap & DMA_HW_FEAT_MGKSEL) >> 10; /* MMC */ dma_cap->rmon = (hw_cap & DMA_HW_FEAT_MMCSEL) >> 11; /* IEEE 1588-2002 */ dma_cap->time_stamp = (hw_cap & DMA_HW_FEAT_TSVER1SEL) >> 12; /* IEEE 1588-2008 */ dma_cap->atime_stamp = (hw_cap & DMA_HW_FEAT_TSVER2SEL) >> 13; /* 802.3az - Energy-Efficient Ethernet (EEE) */ dma_cap->eee = (hw_cap & DMA_HW_FEAT_EEESEL) >> 14; dma_cap->av = (hw_cap & DMA_HW_FEAT_AVSEL) >> 15; /* TX and RX csum */ dma_cap->tx_coe = (hw_cap & DMA_HW_FEAT_TXCOESEL) >> 16; dma_cap->rx_coe_type1 = (hw_cap & DMA_HW_FEAT_RXTYP1COE) >> 17; dma_cap->rx_coe_type2 = (hw_cap & DMA_HW_FEAT_RXTYP2COE) >> 18; dma_cap->rxfifo_over_2048 = (hw_cap & DMA_HW_FEAT_RXFIFOSIZE) >> 19; /* TX and RX number of channels */ dma_cap->number_rx_channel = (hw_cap & DMA_HW_FEAT_RXCHCNT) >> 20; dma_cap->number_tx_channel = (hw_cap & DMA_HW_FEAT_TXCHCNT) >> 22; /* Alternate (enhanced) DESC mode */ dma_cap->enh_desc = (hw_cap & DMA_HW_FEAT_ENHDESSEL) >> 24; return 0; } static void dwmac1000_rx_watchdog(struct stmmac_priv *priv, void __iomem *ioaddr, u32 riwt, u32 queue) { writel(riwt, ioaddr + DMA_CHAN_RX_WATCHDOG(queue)); } const struct stmmac_dma_ops dwmac1000_dma_ops = { .reset = dwmac_dma_reset, .init_chan = dwmac1000_dma_init_channel, .init_rx_chan = dwmac1000_dma_init_rx, .init_tx_chan = dwmac1000_dma_init_tx, .axi = dwmac1000_dma_axi, .dump_regs = dwmac1000_dump_dma_regs, .dma_rx_mode = dwmac1000_dma_operation_mode_rx, .dma_tx_mode = dwmac1000_dma_operation_mode_tx, .enable_dma_transmission = dwmac_enable_dma_transmission, .enable_dma_irq = dwmac_enable_dma_irq, .disable_dma_irq = dwmac_disable_dma_irq, .start_tx = dwmac_dma_start_tx, .stop_tx = dwmac_dma_stop_tx, .start_rx = dwmac_dma_start_rx, .stop_rx = dwmac_dma_stop_rx, .dma_interrupt = dwmac_dma_interrupt, .get_hw_feature = dwmac1000_get_hw_feature, .rx_watchdog = dwmac1000_rx_watchdog, }; EXPORT_SYMBOL_GPL(dwmac1000_dma_ops);