drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * This is the driver for the GMAC on-chip Ethernet controller for ST SoCs.
  * DWC Ether MAC version 4.xx  has been used for  developing this code.
  *
  * This contains the functions to handle the dma.
  *
  * Copyright (C) 2015  STMicroelectronics Ltd
  *
  * Author: Alexandre Torgue <alexandre.torgue@st.com>
  */

 #include <linux/io.h>
 #include "dwmac4.h"
 #include "dwmac4_dma.h"

 static void dwmac4_dma_axi(void __iomem *ioaddr, struct stmmac_axi *axi)
 {
 	u32 value = readl(ioaddr + DMA_SYS_BUS_MODE);
 	int i;

 	pr_info("dwmac4: Master AXI performs %s burst length\n",
 		(value & DMA_SYS_BUS_FB) ? "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_OSR_MAX) <<
 		 DMA_AXI_WR_OSR_LMT_SHIFT;

 	value &= ~DMA_AXI_RD_OSR_LMT;
 	value |= (axi->axi_rd_osr_lmt & DMA_AXI_OSR_MAX) <<
 		 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_SYS_BUS_MODE);
 }

 static void dwmac4_dma_init_rx_chan(void __iomem *ioaddr,
 				    struct stmmac_dma_cfg *dma_cfg,
 				    dma_addr_t dma_rx_phy, u32 chan)
 {
 	u32 value;
 	u32 rxpbl = dma_cfg->rxpbl ?: dma_cfg->pbl;

 	value = readl(ioaddr + DMA_CHAN_RX_CONTROL(chan));
 	value = value | (rxpbl << DMA_BUS_MODE_RPBL_SHIFT);
 	writel(value, ioaddr + DMA_CHAN_RX_CONTROL(chan));

 	writel(lower_32_bits(dma_rx_phy), ioaddr + DMA_CHAN_RX_BASE_ADDR(chan));
 }

 static void dwmac4_dma_init_tx_chan(void __iomem *ioaddr,
 				    struct stmmac_dma_cfg *dma_cfg,
 				    dma_addr_t dma_tx_phy, u32 chan)
 {
 	u32 value;
 	u32 txpbl = dma_cfg->txpbl ?: dma_cfg->pbl;

 	value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan));
 	value = value | (txpbl << DMA_BUS_MODE_PBL_SHIFT);

 	/* Enable OSP to get best performance */
 	value |= DMA_CONTROL_OSP;

 	writel(value, ioaddr + DMA_CHAN_TX_CONTROL(chan));

 	writel(lower_32_bits(dma_tx_phy), ioaddr + DMA_CHAN_TX_BASE_ADDR(chan));
 }

 static void dwmac4_dma_init_channel(void __iomem *ioaddr,
 				    struct stmmac_dma_cfg *dma_cfg, u32 chan)
 {
 	u32 value;

 	/* common channel control register config */
 	value = readl(ioaddr + DMA_CHAN_CONTROL(chan));
 	if (dma_cfg->pblx8)
 		value = value | DMA_BUS_MODE_PBL;
 	writel(value, ioaddr + DMA_CHAN_CONTROL(chan));

 	/* Mask interrupts by writing to CSR7 */
 	writel(DMA_CHAN_INTR_DEFAULT_MASK,
 	       ioaddr + DMA_CHAN_INTR_ENA(chan));
 }

 static void dwmac4_dma_init(void __iomem *ioaddr,
 			    struct stmmac_dma_cfg *dma_cfg, int atds)
 {
 	u32 value = readl(ioaddr + DMA_SYS_BUS_MODE);

 	/* Set the Fixed burst mode */
 	if (dma_cfg->fixed_burst)
 		value |= DMA_SYS_BUS_FB;

 	/* Mixed Burst has no effect when fb is set */
 	if (dma_cfg->mixed_burst)
 		value |= DMA_SYS_BUS_MB;

 	if (dma_cfg->aal)
 		value |= DMA_SYS_BUS_AAL;

 	writel(value, ioaddr + DMA_SYS_BUS_MODE);
 }

 static void _dwmac4_dump_dma_regs(void __iomem *ioaddr, u32 channel,
 				  u32 *reg_space)
 {
 	reg_space[DMA_CHAN_CONTROL(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_CONTROL(channel));
 	reg_space[DMA_CHAN_TX_CONTROL(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_TX_CONTROL(channel));
 	reg_space[DMA_CHAN_RX_CONTROL(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_RX_CONTROL(channel));
 	reg_space[DMA_CHAN_TX_BASE_ADDR(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_TX_BASE_ADDR(channel));
 	reg_space[DMA_CHAN_RX_BASE_ADDR(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_RX_BASE_ADDR(channel));
 	reg_space[DMA_CHAN_TX_END_ADDR(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_TX_END_ADDR(channel));
 	reg_space[DMA_CHAN_RX_END_ADDR(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_RX_END_ADDR(channel));
 	reg_space[DMA_CHAN_TX_RING_LEN(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_TX_RING_LEN(channel));
 	reg_space[DMA_CHAN_RX_RING_LEN(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_RX_RING_LEN(channel));
 	reg_space[DMA_CHAN_INTR_ENA(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_INTR_ENA(channel));
 	reg_space[DMA_CHAN_RX_WATCHDOG(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_RX_WATCHDOG(channel));
 	reg_space[DMA_CHAN_SLOT_CTRL_STATUS(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_SLOT_CTRL_STATUS(channel));
 	reg_space[DMA_CHAN_CUR_TX_DESC(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_CUR_TX_DESC(channel));
 	reg_space[DMA_CHAN_CUR_RX_DESC(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_CUR_RX_DESC(channel));
 	reg_space[DMA_CHAN_CUR_TX_BUF_ADDR(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_CUR_TX_BUF_ADDR(channel));
 	reg_space[DMA_CHAN_CUR_RX_BUF_ADDR(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_CUR_RX_BUF_ADDR(channel));
 	reg_space[DMA_CHAN_STATUS(channel) / 4] =
 		readl(ioaddr + DMA_CHAN_STATUS(channel));
 }

 static void dwmac4_dump_dma_regs(void __iomem *ioaddr, u32 *reg_space)
 {
 	int i;

 	for (i = 0; i < DMA_CHANNEL_NB_MAX; i++)
 		_dwmac4_dump_dma_regs(ioaddr, i, reg_space);
 }

 static void dwmac4_rx_watchdog(void __iomem *ioaddr, u32 riwt, u32 number_chan)
 {
 	u32 chan;

 	for (chan = 0; chan < number_chan; chan++)
 		writel(riwt, ioaddr + DMA_CHAN_RX_WATCHDOG(chan));
 }

 static void dwmac4_dma_rx_chan_op_mode(void __iomem *ioaddr, int mode,
 				       u32 channel, int fifosz, u8 qmode)
 {
 	unsigned int rqs = fifosz / 256 - 1;
 	u32 mtl_rx_op, mtl_rx_int;

 	mtl_rx_op = readl(ioaddr + MTL_CHAN_RX_OP_MODE(channel));

 	if (mode == SF_DMA_MODE) {
 		pr_debug("GMAC: enable RX store and forward mode\n");
 		mtl_rx_op |= MTL_OP_MODE_RSF;
 	} else {
 		pr_debug("GMAC: disable RX SF mode (threshold %d)\n", mode);
 		mtl_rx_op &= ~MTL_OP_MODE_RSF;
 		mtl_rx_op &= MTL_OP_MODE_RTC_MASK;
 		if (mode <= 32)
 			mtl_rx_op |= MTL_OP_MODE_RTC_32;
 		else if (mode <= 64)
 			mtl_rx_op |= MTL_OP_MODE_RTC_64;
 		else if (mode <= 96)
 			mtl_rx_op |= MTL_OP_MODE_RTC_96;
 		else
 			mtl_rx_op |= MTL_OP_MODE_RTC_128;
 	}

 	mtl_rx_op &= ~MTL_OP_MODE_RQS_MASK;
 	mtl_rx_op |= rqs << MTL_OP_MODE_RQS_SHIFT;

 	/* Enable flow control only if each channel gets 4 KiB or more FIFO and
 	 * only if channel is not an AVB channel.
 	 */
 	if ((fifosz >= 4096) && (qmode != MTL_QUEUE_AVB)) {
 		unsigned int rfd, rfa;

 		mtl_rx_op |= MTL_OP_MODE_EHFC;

 		/* Set Threshold for Activating Flow Control to min 2 frames,
 		 * i.e. 1500 * 2 = 3000 bytes.
 		 *
 		 * Set Threshold for Deactivating Flow Control to min 1 frame,
 		 * i.e. 1500 bytes.
 		 */
 		switch (fifosz) {
 		case 4096:
 			/* This violates the above formula because of FIFO size
 			 * limit therefore overflow may occur in spite of this.
 			 */
 			rfd = 0x03; /* Full-2.5K */
 			rfa = 0x01; /* Full-1.5K */
 			break;

 		case 8192:
 			rfd = 0x06; /* Full-4K */
 			rfa = 0x0a; /* Full-6K */
 			break;

 		case 16384:
 			rfd = 0x06; /* Full-4K */
 			rfa = 0x12; /* Full-10K */
 			break;

 		default:
 			rfd = 0x06; /* Full-4K */
 			rfa = 0x1e; /* Full-16K */
 			break;
 		}

 		mtl_rx_op &= ~MTL_OP_MODE_RFD_MASK;
 		mtl_rx_op |= rfd << MTL_OP_MODE_RFD_SHIFT;

 		mtl_rx_op &= ~MTL_OP_MODE_RFA_MASK;
 		mtl_rx_op |= rfa << MTL_OP_MODE_RFA_SHIFT;
 	}

 	writel(mtl_rx_op, ioaddr + MTL_CHAN_RX_OP_MODE(channel));

 	/* Enable MTL RX overflow */
 	mtl_rx_int = readl(ioaddr + MTL_CHAN_INT_CTRL(channel));
 	writel(mtl_rx_int | MTL_RX_OVERFLOW_INT_EN,
 	       ioaddr + MTL_CHAN_INT_CTRL(channel));
 }

 static void dwmac4_dma_tx_chan_op_mode(void __iomem *ioaddr, int mode,
 				       u32 channel, int fifosz, u8 qmode)
 {
 	u32 mtl_tx_op = readl(ioaddr + MTL_CHAN_TX_OP_MODE(channel));
 	unsigned int tqs = fifosz / 256 - 1;

 	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. */
 		mtl_tx_op |= MTL_OP_MODE_TSF;
 	} else {
 		pr_debug("GMAC: disabling TX SF (threshold %d)\n", mode);
 		mtl_tx_op &= ~MTL_OP_MODE_TSF;
 		mtl_tx_op &= MTL_OP_MODE_TTC_MASK;
 		/* Set the transmit threshold */
 		if (mode <= 32)
 			mtl_tx_op |= MTL_OP_MODE_TTC_32;
 		else if (mode <= 64)
 			mtl_tx_op |= MTL_OP_MODE_TTC_64;
 		else if (mode <= 96)
 			mtl_tx_op |= MTL_OP_MODE_TTC_96;
 		else if (mode <= 128)
 			mtl_tx_op |= MTL_OP_MODE_TTC_128;
 		else if (mode <= 192)
 			mtl_tx_op |= MTL_OP_MODE_TTC_192;
 		else if (mode <= 256)
 			mtl_tx_op |= MTL_OP_MODE_TTC_256;
 		else if (mode <= 384)
 			mtl_tx_op |= MTL_OP_MODE_TTC_384;
 		else
 			mtl_tx_op |= MTL_OP_MODE_TTC_512;
 	}
 	/* For an IP with DWC_EQOS_NUM_TXQ == 1, the fields TXQEN and TQS are RO
 	 * with reset values: TXQEN on, TQS == DWC_EQOS_TXFIFO_SIZE.
 	 * For an IP with DWC_EQOS_NUM_TXQ > 1, the fields TXQEN and TQS are R/W
 	 * with reset values: TXQEN off, TQS 256 bytes.
 	 *
 	 * TXQEN must be written for multi-channel operation and TQS must
 	 * reflect the available fifo size per queue (total fifo size / number
 	 * of enabled queues).
 	 */
 	mtl_tx_op &= ~MTL_OP_MODE_TXQEN_MASK;
 	if (qmode != MTL_QUEUE_AVB)
 		mtl_tx_op |= MTL_OP_MODE_TXQEN;
 	else
 		mtl_tx_op |= MTL_OP_MODE_TXQEN_AV;
 	mtl_tx_op &= ~MTL_OP_MODE_TQS_MASK;
 	mtl_tx_op |= tqs << MTL_OP_MODE_TQS_SHIFT;

 	writel(mtl_tx_op, ioaddr +  MTL_CHAN_TX_OP_MODE(channel));
 }

 static void dwmac4_get_hw_feature(void __iomem *ioaddr,
 				  struct dma_features *dma_cap)
 {
 	u32 hw_cap = readl(ioaddr + GMAC_HW_FEATURE0);

 	/*  MAC HW feature0 */
 	dma_cap->mbps_10_100 = (hw_cap & GMAC_HW_FEAT_MIISEL);
 	dma_cap->mbps_1000 = (hw_cap & GMAC_HW_FEAT_GMIISEL) >> 1;
 	dma_cap->half_duplex = (hw_cap & GMAC_HW_FEAT_HDSEL) >> 2;
 	dma_cap->hash_filter = (hw_cap & GMAC_HW_FEAT_VLHASH) >> 4;
 	dma_cap->multi_addr = (hw_cap & GMAC_HW_FEAT_ADDMAC) >> 18;
 	dma_cap->pcs = (hw_cap & GMAC_HW_FEAT_PCSSEL) >> 3;
 	dma_cap->sma_mdio = (hw_cap & GMAC_HW_FEAT_SMASEL) >> 5;
 	dma_cap->pmt_remote_wake_up = (hw_cap & GMAC_HW_FEAT_RWKSEL) >> 6;
 	dma_cap->pmt_magic_frame = (hw_cap & GMAC_HW_FEAT_MGKSEL) >> 7;
 	/* MMC */
 	dma_cap->rmon = (hw_cap & GMAC_HW_FEAT_MMCSEL) >> 8;
 	/* IEEE 1588-2008 */
 	dma_cap->atime_stamp = (hw_cap & GMAC_HW_FEAT_TSSEL) >> 12;
 	/* 802.3az - Energy-Efficient Ethernet (EEE) */
 	dma_cap->eee = (hw_cap & GMAC_HW_FEAT_EEESEL) >> 13;
 	/* TX and RX csum */
 	dma_cap->tx_coe = (hw_cap & GMAC_HW_FEAT_TXCOSEL) >> 14;
 	dma_cap->rx_coe =  (hw_cap & GMAC_HW_FEAT_RXCOESEL) >> 16;

 	/* MAC HW feature1 */
 	hw_cap = readl(ioaddr + GMAC_HW_FEATURE1);
 	dma_cap->hash_tb_sz = (hw_cap & GMAC_HW_HASH_TB_SZ) >> 24;
 	dma_cap->av = (hw_cap & GMAC_HW_FEAT_AVSEL) >> 20;
 	dma_cap->tsoen = (hw_cap & GMAC_HW_TSOEN) >> 18;
 	/* RX and TX FIFO sizes are encoded as log2(n / 128). Undo that by
 	 * shifting and store the sizes in bytes.
 	 */
 	dma_cap->tx_fifo_size = 128 << ((hw_cap & GMAC_HW_TXFIFOSIZE) >> 6);
 	dma_cap->rx_fifo_size = 128 << ((hw_cap & GMAC_HW_RXFIFOSIZE) >> 0);
 	/* MAC HW feature2 */
 	hw_cap = readl(ioaddr + GMAC_HW_FEATURE2);
 	/* TX and RX number of channels */
 	dma_cap->number_rx_channel =
 		((hw_cap & GMAC_HW_FEAT_RXCHCNT) >> 12) + 1;
 	dma_cap->number_tx_channel =
 		((hw_cap & GMAC_HW_FEAT_TXCHCNT) >> 18) + 1;
 	/* TX and RX number of queues */
 	dma_cap->number_rx_queues =
 		((hw_cap & GMAC_HW_FEAT_RXQCNT) >> 0) + 1;
 	dma_cap->number_tx_queues =
 		((hw_cap & GMAC_HW_FEAT_TXQCNT) >> 6) + 1;
 	/* PPS output */
 	dma_cap->pps_out_num = (hw_cap & GMAC_HW_FEAT_PPSOUTNUM) >> 24;

 	/* IEEE 1588-2002 */
 	dma_cap->time_stamp = 0;

 	/* MAC HW feature3 */
 	hw_cap = readl(ioaddr + GMAC_HW_FEATURE3);

 	/* 5.10 Features */
 	dma_cap->asp = (hw_cap & GMAC_HW_FEAT_ASP) >> 28;
 	dma_cap->frpes = (hw_cap & GMAC_HW_FEAT_FRPES) >> 13;
 	dma_cap->frpbs = (hw_cap & GMAC_HW_FEAT_FRPBS) >> 11;
 	dma_cap->frpsel = (hw_cap & GMAC_HW_FEAT_FRPSEL) >> 10;
 }

 /* Enable/disable TSO feature and set MSS */
 static void dwmac4_enable_tso(void __iomem *ioaddr, bool en, u32 chan)
 {
 	u32 value;

 	if (en) {
 		/* enable TSO */
 		value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan));
 		writel(value | DMA_CONTROL_TSE,
 		       ioaddr + DMA_CHAN_TX_CONTROL(chan));
 	} else {
 		/* enable TSO */
 		value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan));
 		writel(value & ~DMA_CONTROL_TSE,
 		       ioaddr + DMA_CHAN_TX_CONTROL(chan));
 	}
 }

 static void dwmac4_qmode(void __iomem *ioaddr, u32 channel, u8 qmode)
 {
 	u32 mtl_tx_op = readl(ioaddr + MTL_CHAN_TX_OP_MODE(channel));

 	mtl_tx_op &= ~MTL_OP_MODE_TXQEN_MASK;
 	if (qmode != MTL_QUEUE_AVB)
 		mtl_tx_op |= MTL_OP_MODE_TXQEN;
 	else
 		mtl_tx_op |= MTL_OP_MODE_TXQEN_AV;

 	writel(mtl_tx_op, ioaddr +  MTL_CHAN_TX_OP_MODE(channel));
 }

 static void dwmac4_set_bfsize(void __iomem *ioaddr, int bfsize, u32 chan)
 {
 	u32 value = readl(ioaddr + DMA_CHAN_RX_CONTROL(chan));

 	value &= ~DMA_RBSZ_MASK;
 	value |= (bfsize << DMA_RBSZ_SHIFT) & DMA_RBSZ_MASK;

 	writel(value, ioaddr + DMA_CHAN_RX_CONTROL(chan));
 }

 const struct stmmac_dma_ops dwmac4_dma_ops = {
 	.reset = dwmac4_dma_reset,
 	.init = dwmac4_dma_init,
 	.init_chan = dwmac4_dma_init_channel,
 	.init_rx_chan = dwmac4_dma_init_rx_chan,
 	.init_tx_chan = dwmac4_dma_init_tx_chan,
 	.axi = dwmac4_dma_axi,
 	.dump_regs = dwmac4_dump_dma_regs,
 	.dma_rx_mode = dwmac4_dma_rx_chan_op_mode,
 	.dma_tx_mode = dwmac4_dma_tx_chan_op_mode,
 	.enable_dma_irq = dwmac4_enable_dma_irq,
 	.disable_dma_irq = dwmac4_disable_dma_irq,
 	.start_tx = dwmac4_dma_start_tx,
 	.stop_tx = dwmac4_dma_stop_tx,
 	.start_rx = dwmac4_dma_start_rx,
 	.stop_rx = dwmac4_dma_stop_rx,
 	.dma_interrupt = dwmac4_dma_interrupt,
 	.get_hw_feature = dwmac4_get_hw_feature,
 	.rx_watchdog = dwmac4_rx_watchdog,
 	.set_rx_ring_len = dwmac4_set_rx_ring_len,
 	.set_tx_ring_len = dwmac4_set_tx_ring_len,
 	.set_rx_tail_ptr = dwmac4_set_rx_tail_ptr,
 	.set_tx_tail_ptr = dwmac4_set_tx_tail_ptr,
 	.enable_tso = dwmac4_enable_tso,
 	.qmode = dwmac4_qmode,
 	.set_bfsize = dwmac4_set_bfsize,
 };

 const struct stmmac_dma_ops dwmac410_dma_ops = {
 	.reset = dwmac4_dma_reset,
 	.init = dwmac4_dma_init,
 	.init_chan = dwmac4_dma_init_channel,
 	.init_rx_chan = dwmac4_dma_init_rx_chan,
 	.init_tx_chan = dwmac4_dma_init_tx_chan,
 	.axi = dwmac4_dma_axi,
 	.dump_regs = dwmac4_dump_dma_regs,
 	.dma_rx_mode = dwmac4_dma_rx_chan_op_mode,
 	.dma_tx_mode = dwmac4_dma_tx_chan_op_mode,
 	.enable_dma_irq = dwmac410_enable_dma_irq,
 	.disable_dma_irq = dwmac4_disable_dma_irq,
 	.start_tx = dwmac4_dma_start_tx,
 	.stop_tx = dwmac4_dma_stop_tx,
 	.start_rx = dwmac4_dma_start_rx,
 	.stop_rx = dwmac4_dma_stop_rx,
 	.dma_interrupt = dwmac4_dma_interrupt,
 	.get_hw_feature = dwmac4_get_hw_feature,
 	.rx_watchdog = dwmac4_rx_watchdog,
 	.set_rx_ring_len = dwmac4_set_rx_ring_len,
 	.set_tx_ring_len = dwmac4_set_tx_ring_len,
 	.set_rx_tail_ptr = dwmac4_set_rx_tail_ptr,
 	.set_tx_tail_ptr = dwmac4_set_tx_tail_ptr,
 	.enable_tso = dwmac4_enable_tso,
 	.qmode = dwmac4_qmode,
 	.set_bfsize = dwmac4_set_bfsize,
 };
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* This is the driver for the GMAC on-chip Ethernet controller for ST SoCs.
	* DWC Ether MAC version 4.xx has been used for developing this code.
	*
	* This contains the functions to handle the dma.
	*
	* Copyright (C) 2015 STMicroelectronics Ltd
	*
	* Author: Alexandre Torgue <alexandre.torgue@st.com>
	*/

	#include <linux/io.h>
	#include "dwmac4.h"
	#include "dwmac4_dma.h"

	static void dwmac4_dma_axi(void __iomem ioaddr, struct stmmac_axi axi)
	{
	u32 value = readl(ioaddr + DMA_SYS_BUS_MODE);
	int i;

	pr_info("dwmac4: Master AXI performs %s burst length\n",
	(value & DMA_SYS_BUS_FB) ? "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_OSR_MAX) <<
	DMA_AXI_WR_OSR_LMT_SHIFT;

	value &= ~DMA_AXI_RD_OSR_LMT;
	value \|= (axi->axi_rd_osr_lmt & DMA_AXI_OSR_MAX) <<
	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_SYS_BUS_MODE);
	}

	static void dwmac4_dma_init_rx_chan(void __iomem *ioaddr,
	struct stmmac_dma_cfg *dma_cfg,
	dma_addr_t dma_rx_phy, u32 chan)
	{
	u32 value;
	u32 rxpbl = dma_cfg->rxpbl ?: dma_cfg->pbl;

	value = readl(ioaddr + DMA_CHAN_RX_CONTROL(chan));
	value = value \| (rxpbl << DMA_BUS_MODE_RPBL_SHIFT);
	writel(value, ioaddr + DMA_CHAN_RX_CONTROL(chan));

	writel(lower_32_bits(dma_rx_phy), ioaddr + DMA_CHAN_RX_BASE_ADDR(chan));
	}

	static void dwmac4_dma_init_tx_chan(void __iomem *ioaddr,
	struct stmmac_dma_cfg *dma_cfg,
	dma_addr_t dma_tx_phy, u32 chan)
	{
	u32 value;
	u32 txpbl = dma_cfg->txpbl ?: dma_cfg->pbl;

	value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan));
	value = value \| (txpbl << DMA_BUS_MODE_PBL_SHIFT);

	/* Enable OSP to get best performance */
	value \|= DMA_CONTROL_OSP;

	writel(value, ioaddr + DMA_CHAN_TX_CONTROL(chan));

	writel(lower_32_bits(dma_tx_phy), ioaddr + DMA_CHAN_TX_BASE_ADDR(chan));
	}

	static void dwmac4_dma_init_channel(void __iomem *ioaddr,
	struct stmmac_dma_cfg *dma_cfg, u32 chan)
	{
	u32 value;

	/* common channel control register config */
	value = readl(ioaddr + DMA_CHAN_CONTROL(chan));
	if (dma_cfg->pblx8)
	value = value \| DMA_BUS_MODE_PBL;
	writel(value, ioaddr + DMA_CHAN_CONTROL(chan));

	/* Mask interrupts by writing to CSR7 */
	writel(DMA_CHAN_INTR_DEFAULT_MASK,
	ioaddr + DMA_CHAN_INTR_ENA(chan));
	}

	static void dwmac4_dma_init(void __iomem *ioaddr,
	struct stmmac_dma_cfg *dma_cfg, int atds)
	{
	u32 value = readl(ioaddr + DMA_SYS_BUS_MODE);

	/* Set the Fixed burst mode */
	if (dma_cfg->fixed_burst)
	value \|= DMA_SYS_BUS_FB;

	/* Mixed Burst has no effect when fb is set */
	if (dma_cfg->mixed_burst)
	value \|= DMA_SYS_BUS_MB;

	if (dma_cfg->aal)
	value \|= DMA_SYS_BUS_AAL;

	writel(value, ioaddr + DMA_SYS_BUS_MODE);
	}

	static void _dwmac4_dump_dma_regs(void __iomem *ioaddr, u32 channel,
	u32 *reg_space)
	{
	reg_space[DMA_CHAN_CONTROL(channel) / 4] =
	readl(ioaddr + DMA_CHAN_CONTROL(channel));
	reg_space[DMA_CHAN_TX_CONTROL(channel) / 4] =
	readl(ioaddr + DMA_CHAN_TX_CONTROL(channel));
	reg_space[DMA_CHAN_RX_CONTROL(channel) / 4] =
	readl(ioaddr + DMA_CHAN_RX_CONTROL(channel));
	reg_space[DMA_CHAN_TX_BASE_ADDR(channel) / 4] =
	readl(ioaddr + DMA_CHAN_TX_BASE_ADDR(channel));
	reg_space[DMA_CHAN_RX_BASE_ADDR(channel) / 4] =
	readl(ioaddr + DMA_CHAN_RX_BASE_ADDR(channel));
	reg_space[DMA_CHAN_TX_END_ADDR(channel) / 4] =
	readl(ioaddr + DMA_CHAN_TX_END_ADDR(channel));
	reg_space[DMA_CHAN_RX_END_ADDR(channel) / 4] =
	readl(ioaddr + DMA_CHAN_RX_END_ADDR(channel));
	reg_space[DMA_CHAN_TX_RING_LEN(channel) / 4] =
	readl(ioaddr + DMA_CHAN_TX_RING_LEN(channel));
	reg_space[DMA_CHAN_RX_RING_LEN(channel) / 4] =
	readl(ioaddr + DMA_CHAN_RX_RING_LEN(channel));
	reg_space[DMA_CHAN_INTR_ENA(channel) / 4] =
	readl(ioaddr + DMA_CHAN_INTR_ENA(channel));
	reg_space[DMA_CHAN_RX_WATCHDOG(channel) / 4] =
	readl(ioaddr + DMA_CHAN_RX_WATCHDOG(channel));
	reg_space[DMA_CHAN_SLOT_CTRL_STATUS(channel) / 4] =
	readl(ioaddr + DMA_CHAN_SLOT_CTRL_STATUS(channel));
	reg_space[DMA_CHAN_CUR_TX_DESC(channel) / 4] =
	readl(ioaddr + DMA_CHAN_CUR_TX_DESC(channel));
	reg_space[DMA_CHAN_CUR_RX_DESC(channel) / 4] =
	readl(ioaddr + DMA_CHAN_CUR_RX_DESC(channel));
	reg_space[DMA_CHAN_CUR_TX_BUF_ADDR(channel) / 4] =
	readl(ioaddr + DMA_CHAN_CUR_TX_BUF_ADDR(channel));
	reg_space[DMA_CHAN_CUR_RX_BUF_ADDR(channel) / 4] =
	readl(ioaddr + DMA_CHAN_CUR_RX_BUF_ADDR(channel));
	reg_space[DMA_CHAN_STATUS(channel) / 4] =
	readl(ioaddr + DMA_CHAN_STATUS(channel));
	}

	static void dwmac4_dump_dma_regs(void __iomem ioaddr, u32 reg_space)
	{
	int i;

	for (i = 0; i < DMA_CHANNEL_NB_MAX; i++)
	_dwmac4_dump_dma_regs(ioaddr, i, reg_space);
	}

	static void dwmac4_rx_watchdog(void __iomem *ioaddr, u32 riwt, u32 number_chan)
	{
	u32 chan;

	for (chan = 0; chan < number_chan; chan++)
	writel(riwt, ioaddr + DMA_CHAN_RX_WATCHDOG(chan));
	}

	static void dwmac4_dma_rx_chan_op_mode(void __iomem *ioaddr, int mode,
	u32 channel, int fifosz, u8 qmode)
	{
	unsigned int rqs = fifosz / 256 - 1;
	u32 mtl_rx_op, mtl_rx_int;

	mtl_rx_op = readl(ioaddr + MTL_CHAN_RX_OP_MODE(channel));

	if (mode == SF_DMA_MODE) {
	pr_debug("GMAC: enable RX store and forward mode\n");
	mtl_rx_op \|= MTL_OP_MODE_RSF;
	} else {
	pr_debug("GMAC: disable RX SF mode (threshold %d)\n", mode);
	mtl_rx_op &= ~MTL_OP_MODE_RSF;
	mtl_rx_op &= MTL_OP_MODE_RTC_MASK;
	if (mode <= 32)
	mtl_rx_op \|= MTL_OP_MODE_RTC_32;
	else if (mode <= 64)
	mtl_rx_op \|= MTL_OP_MODE_RTC_64;
	else if (mode <= 96)
	mtl_rx_op \|= MTL_OP_MODE_RTC_96;
	else
	mtl_rx_op \|= MTL_OP_MODE_RTC_128;
	}

	mtl_rx_op &= ~MTL_OP_MODE_RQS_MASK;
	mtl_rx_op \|= rqs << MTL_OP_MODE_RQS_SHIFT;

	/* Enable flow control only if each channel gets 4 KiB or more FIFO and
	* only if channel is not an AVB channel.
	*/
	if ((fifosz >= 4096) && (qmode != MTL_QUEUE_AVB)) {
	unsigned int rfd, rfa;

	mtl_rx_op \|= MTL_OP_MODE_EHFC;

	/* Set Threshold for Activating Flow Control to min 2 frames,
	* i.e. 1500 * 2 = 3000 bytes.
	*
	* Set Threshold for Deactivating Flow Control to min 1 frame,
	* i.e. 1500 bytes.
	*/
	switch (fifosz) {
	case 4096:
	/* This violates the above formula because of FIFO size
	* limit therefore overflow may occur in spite of this.
	*/
	rfd = 0x03; /* Full-2.5K */
	rfa = 0x01; /* Full-1.5K */
	break;

	case 8192:
	rfd = 0x06; /* Full-4K */
	rfa = 0x0a; /* Full-6K */
	break;

	case 16384:
	rfd = 0x06; /* Full-4K */
	rfa = 0x12; /* Full-10K */
	break;

	default:
	rfd = 0x06; /* Full-4K */
	rfa = 0x1e; /* Full-16K */
	break;
	}

	mtl_rx_op &= ~MTL_OP_MODE_RFD_MASK;
	mtl_rx_op \|= rfd << MTL_OP_MODE_RFD_SHIFT;

	mtl_rx_op &= ~MTL_OP_MODE_RFA_MASK;
	mtl_rx_op \|= rfa << MTL_OP_MODE_RFA_SHIFT;
	}

	writel(mtl_rx_op, ioaddr + MTL_CHAN_RX_OP_MODE(channel));

	/* Enable MTL RX overflow */
	mtl_rx_int = readl(ioaddr + MTL_CHAN_INT_CTRL(channel));
	writel(mtl_rx_int \| MTL_RX_OVERFLOW_INT_EN,
	ioaddr + MTL_CHAN_INT_CTRL(channel));
	}

	static void dwmac4_dma_tx_chan_op_mode(void __iomem *ioaddr, int mode,
	u32 channel, int fifosz, u8 qmode)
	{
	u32 mtl_tx_op = readl(ioaddr + MTL_CHAN_TX_OP_MODE(channel));
	unsigned int tqs = fifosz / 256 - 1;

	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. */
	mtl_tx_op \|= MTL_OP_MODE_TSF;
	} else {
	pr_debug("GMAC: disabling TX SF (threshold %d)\n", mode);
	mtl_tx_op &= ~MTL_OP_MODE_TSF;
	mtl_tx_op &= MTL_OP_MODE_TTC_MASK;
	/* Set the transmit threshold */
	if (mode <= 32)
	mtl_tx_op \|= MTL_OP_MODE_TTC_32;
	else if (mode <= 64)
	mtl_tx_op \|= MTL_OP_MODE_TTC_64;
	else if (mode <= 96)
	mtl_tx_op \|= MTL_OP_MODE_TTC_96;
	else if (mode <= 128)
	mtl_tx_op \|= MTL_OP_MODE_TTC_128;
	else if (mode <= 192)
	mtl_tx_op \|= MTL_OP_MODE_TTC_192;
	else if (mode <= 256)
	mtl_tx_op \|= MTL_OP_MODE_TTC_256;
	else if (mode <= 384)
	mtl_tx_op \|= MTL_OP_MODE_TTC_384;
	else
	mtl_tx_op \|= MTL_OP_MODE_TTC_512;
	}
	/* For an IP with DWC_EQOS_NUM_TXQ == 1, the fields TXQEN and TQS are RO
	* with reset values: TXQEN on, TQS == DWC_EQOS_TXFIFO_SIZE.
	* For an IP with DWC_EQOS_NUM_TXQ > 1, the fields TXQEN and TQS are R/W
	* with reset values: TXQEN off, TQS 256 bytes.
	*
	* TXQEN must be written for multi-channel operation and TQS must
	* reflect the available fifo size per queue (total fifo size / number
	* of enabled queues).
	*/
	mtl_tx_op &= ~MTL_OP_MODE_TXQEN_MASK;
	if (qmode != MTL_QUEUE_AVB)
	mtl_tx_op \|= MTL_OP_MODE_TXQEN;
	else
	mtl_tx_op \|= MTL_OP_MODE_TXQEN_AV;
	mtl_tx_op &= ~MTL_OP_MODE_TQS_MASK;
	mtl_tx_op \|= tqs << MTL_OP_MODE_TQS_SHIFT;

	writel(mtl_tx_op, ioaddr + MTL_CHAN_TX_OP_MODE(channel));
	}

	static void dwmac4_get_hw_feature(void __iomem *ioaddr,
	struct dma_features *dma_cap)
	{
	u32 hw_cap = readl(ioaddr + GMAC_HW_FEATURE0);

	/* MAC HW feature0 */
	dma_cap->mbps_10_100 = (hw_cap & GMAC_HW_FEAT_MIISEL);
	dma_cap->mbps_1000 = (hw_cap & GMAC_HW_FEAT_GMIISEL) >> 1;
	dma_cap->half_duplex = (hw_cap & GMAC_HW_FEAT_HDSEL) >> 2;
	dma_cap->hash_filter = (hw_cap & GMAC_HW_FEAT_VLHASH) >> 4;
	dma_cap->multi_addr = (hw_cap & GMAC_HW_FEAT_ADDMAC) >> 18;
	dma_cap->pcs = (hw_cap & GMAC_HW_FEAT_PCSSEL) >> 3;
	dma_cap->sma_mdio = (hw_cap & GMAC_HW_FEAT_SMASEL) >> 5;
	dma_cap->pmt_remote_wake_up = (hw_cap & GMAC_HW_FEAT_RWKSEL) >> 6;
	dma_cap->pmt_magic_frame = (hw_cap & GMAC_HW_FEAT_MGKSEL) >> 7;
	/* MMC */
	dma_cap->rmon = (hw_cap & GMAC_HW_FEAT_MMCSEL) >> 8;
	/* IEEE 1588-2008 */
	dma_cap->atime_stamp = (hw_cap & GMAC_HW_FEAT_TSSEL) >> 12;
	/* 802.3az - Energy-Efficient Ethernet (EEE) */
	dma_cap->eee = (hw_cap & GMAC_HW_FEAT_EEESEL) >> 13;
	/* TX and RX csum */
	dma_cap->tx_coe = (hw_cap & GMAC_HW_FEAT_TXCOSEL) >> 14;
	dma_cap->rx_coe = (hw_cap & GMAC_HW_FEAT_RXCOESEL) >> 16;

	/* MAC HW feature1 */
	hw_cap = readl(ioaddr + GMAC_HW_FEATURE1);
	dma_cap->hash_tb_sz = (hw_cap & GMAC_HW_HASH_TB_SZ) >> 24;
	dma_cap->av = (hw_cap & GMAC_HW_FEAT_AVSEL) >> 20;
	dma_cap->tsoen = (hw_cap & GMAC_HW_TSOEN) >> 18;
	/* RX and TX FIFO sizes are encoded as log2(n / 128). Undo that by
	* shifting and store the sizes in bytes.
	*/
	dma_cap->tx_fifo_size = 128 << ((hw_cap & GMAC_HW_TXFIFOSIZE) >> 6);
	dma_cap->rx_fifo_size = 128 << ((hw_cap & GMAC_HW_RXFIFOSIZE) >> 0);
	/* MAC HW feature2 */
	hw_cap = readl(ioaddr + GMAC_HW_FEATURE2);
	/* TX and RX number of channels */
	dma_cap->number_rx_channel =
	((hw_cap & GMAC_HW_FEAT_RXCHCNT) >> 12) + 1;
	dma_cap->number_tx_channel =
	((hw_cap & GMAC_HW_FEAT_TXCHCNT) >> 18) + 1;
	/* TX and RX number of queues */
	dma_cap->number_rx_queues =
	((hw_cap & GMAC_HW_FEAT_RXQCNT) >> 0) + 1;
	dma_cap->number_tx_queues =
	((hw_cap & GMAC_HW_FEAT_TXQCNT) >> 6) + 1;
	/* PPS output */
	dma_cap->pps_out_num = (hw_cap & GMAC_HW_FEAT_PPSOUTNUM) >> 24;

	/* IEEE 1588-2002 */
	dma_cap->time_stamp = 0;

	/* MAC HW feature3 */
	hw_cap = readl(ioaddr + GMAC_HW_FEATURE3);

	/* 5.10 Features */
	dma_cap->asp = (hw_cap & GMAC_HW_FEAT_ASP) >> 28;
	dma_cap->frpes = (hw_cap & GMAC_HW_FEAT_FRPES) >> 13;
	dma_cap->frpbs = (hw_cap & GMAC_HW_FEAT_FRPBS) >> 11;
	dma_cap->frpsel = (hw_cap & GMAC_HW_FEAT_FRPSEL) >> 10;
	}

	/* Enable/disable TSO feature and set MSS */
	static void dwmac4_enable_tso(void __iomem *ioaddr, bool en, u32 chan)
	{
	u32 value;

	if (en) {
	/* enable TSO */
	value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan));
	writel(value \| DMA_CONTROL_TSE,
	ioaddr + DMA_CHAN_TX_CONTROL(chan));
	} else {
	/* enable TSO */
	value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan));
	writel(value & ~DMA_CONTROL_TSE,
	ioaddr + DMA_CHAN_TX_CONTROL(chan));
	}
	}

	static void dwmac4_qmode(void __iomem *ioaddr, u32 channel, u8 qmode)
	{
	u32 mtl_tx_op = readl(ioaddr + MTL_CHAN_TX_OP_MODE(channel));

	mtl_tx_op &= ~MTL_OP_MODE_TXQEN_MASK;
	if (qmode != MTL_QUEUE_AVB)
	mtl_tx_op \|= MTL_OP_MODE_TXQEN;
	else
	mtl_tx_op \|= MTL_OP_MODE_TXQEN_AV;

	writel(mtl_tx_op, ioaddr + MTL_CHAN_TX_OP_MODE(channel));
	}

	static void dwmac4_set_bfsize(void __iomem *ioaddr, int bfsize, u32 chan)
	{
	u32 value = readl(ioaddr + DMA_CHAN_RX_CONTROL(chan));

	value &= ~DMA_RBSZ_MASK;
	value \|= (bfsize << DMA_RBSZ_SHIFT) & DMA_RBSZ_MASK;

	writel(value, ioaddr + DMA_CHAN_RX_CONTROL(chan));
	}

	const struct stmmac_dma_ops dwmac4_dma_ops = {
	.reset = dwmac4_dma_reset,
	.init = dwmac4_dma_init,
	.init_chan = dwmac4_dma_init_channel,
	.init_rx_chan = dwmac4_dma_init_rx_chan,
	.init_tx_chan = dwmac4_dma_init_tx_chan,
	.axi = dwmac4_dma_axi,
	.dump_regs = dwmac4_dump_dma_regs,
	.dma_rx_mode = dwmac4_dma_rx_chan_op_mode,
	.dma_tx_mode = dwmac4_dma_tx_chan_op_mode,
	.enable_dma_irq = dwmac4_enable_dma_irq,
	.disable_dma_irq = dwmac4_disable_dma_irq,
	.start_tx = dwmac4_dma_start_tx,
	.stop_tx = dwmac4_dma_stop_tx,
	.start_rx = dwmac4_dma_start_rx,
	.stop_rx = dwmac4_dma_stop_rx,
	.dma_interrupt = dwmac4_dma_interrupt,
	.get_hw_feature = dwmac4_get_hw_feature,
	.rx_watchdog = dwmac4_rx_watchdog,
	.set_rx_ring_len = dwmac4_set_rx_ring_len,
	.set_tx_ring_len = dwmac4_set_tx_ring_len,
	.set_rx_tail_ptr = dwmac4_set_rx_tail_ptr,
	.set_tx_tail_ptr = dwmac4_set_tx_tail_ptr,
	.enable_tso = dwmac4_enable_tso,
	.qmode = dwmac4_qmode,
	.set_bfsize = dwmac4_set_bfsize,
	};

	const struct stmmac_dma_ops dwmac410_dma_ops = {
	.reset = dwmac4_dma_reset,
	.init = dwmac4_dma_init,
	.init_chan = dwmac4_dma_init_channel,
	.init_rx_chan = dwmac4_dma_init_rx_chan,
	.init_tx_chan = dwmac4_dma_init_tx_chan,
	.axi = dwmac4_dma_axi,
	.dump_regs = dwmac4_dump_dma_regs,
	.dma_rx_mode = dwmac4_dma_rx_chan_op_mode,
	.dma_tx_mode = dwmac4_dma_tx_chan_op_mode,
	.enable_dma_irq = dwmac410_enable_dma_irq,
	.disable_dma_irq = dwmac4_disable_dma_irq,
	.start_tx = dwmac4_dma_start_tx,
	.stop_tx = dwmac4_dma_stop_tx,
	.start_rx = dwmac4_dma_start_rx,
	.stop_rx = dwmac4_dma_stop_rx,
	.dma_interrupt = dwmac4_dma_interrupt,
	.get_hw_feature = dwmac4_get_hw_feature,
	.rx_watchdog = dwmac4_rx_watchdog,
	.set_rx_ring_len = dwmac4_set_rx_ring_len,
	.set_tx_ring_len = dwmac4_set_tx_ring_len,
	.set_rx_tail_ptr = dwmac4_set_rx_tail_ptr,
	.set_tx_tail_ptr = dwmac4_set_tx_tail_ptr,
	.enable_tso = dwmac4_enable_tso,
	.qmode = dwmac4_qmode,
	.set_bfsize = dwmac4_set_bfsize,
	};