drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c - manifest_repos/valens - Git at Google

 /* Applied Micro X-Gene SoC Ethernet Driver
  *
  * Copyright (c) 2014, Applied Micro Circuits Corporation
  * Authors: Iyappan Subramanian <isubramanian@apm.com>
  *	    Keyur Chudgar <kchudgar@apm.com>
  *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
  * Free Software Foundation;  either version 2 of the  License, or (at your
  * option) any later version.
  *
  * This program is distributed in the hope that 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 "xgene_enet_main.h"
 #include "xgene_enet_hw.h"
 #include "xgene_enet_sgmac.h"
 #include "xgene_enet_xgmac.h"

 static void xgene_enet_wr_csr(struct xgene_enet_pdata *p, u32 offset, u32 val)
 {
 	iowrite32(val, p->eth_csr_addr + offset);
 }

 static void xgene_enet_wr_clkrst_csr(struct xgene_enet_pdata *p, u32 offset,
 				     u32 val)
 {
 	iowrite32(val, p->base_addr + offset);
 }

 static void xgene_enet_wr_ring_if(struct xgene_enet_pdata *p,
 				  u32 offset, u32 val)
 {
 	iowrite32(val, p->eth_ring_if_addr + offset);
 }

 static void xgene_enet_wr_diag_csr(struct xgene_enet_pdata *p,
 				   u32 offset, u32 val)
 {
 	iowrite32(val, p->eth_diag_csr_addr + offset);
 }

 static void xgene_enet_wr_mcx_csr(struct xgene_enet_pdata *pdata,
 				  u32 offset, u32 val)
 {
 	void __iomem *addr = pdata->mcx_mac_csr_addr + offset;

 	iowrite32(val, addr);
 }

 static u32 xgene_enet_rd_csr(struct xgene_enet_pdata *p, u32 offset)
 {
 	return ioread32(p->eth_csr_addr + offset);
 }

 static u32 xgene_enet_rd_diag_csr(struct xgene_enet_pdata *p, u32 offset)
 {
 	return ioread32(p->eth_diag_csr_addr + offset);
 }

 static u32 xgene_enet_rd_mcx_csr(struct xgene_enet_pdata *p, u32 offset)
 {
 	return ioread32(p->mcx_mac_csr_addr + offset);
 }

 static int xgene_enet_ecc_init(struct xgene_enet_pdata *p)
 {
 	struct net_device *ndev = p->ndev;
 	u32 data, shutdown;
 	int i = 0;

 	shutdown = xgene_enet_rd_diag_csr(p, ENET_CFG_MEM_RAM_SHUTDOWN_ADDR);
 	data = xgene_enet_rd_diag_csr(p, ENET_BLOCK_MEM_RDY_ADDR);

 	if (!shutdown && data == ~0U) {
 		netdev_dbg(ndev, "+ ecc_init done, skipping\n");
 		return 0;
 	}

 	xgene_enet_wr_diag_csr(p, ENET_CFG_MEM_RAM_SHUTDOWN_ADDR, 0);
 	do {
 		usleep_range(100, 110);
 		data = xgene_enet_rd_diag_csr(p, ENET_BLOCK_MEM_RDY_ADDR);
 		if (data == ~0U)
 			return 0;
 	} while (++i < 10);

 	netdev_err(ndev, "Failed to release memory from shutdown\n");
 	return -ENODEV;
 }

 static void xgene_sgmac_get_drop_cnt(struct xgene_enet_pdata *pdata,
 				     u32 *rx, u32 *tx)
 {
 	u32 addr, count;

 	addr = (pdata->enet_id != XGENE_ENET1) ?
 		XG_MCX_ICM_ECM_DROP_COUNT_REG0_ADDR :
 		ICM_ECM_DROP_COUNT_REG0_ADDR + pdata->port_id * OFFSET_4;
 	count = xgene_enet_rd_mcx_csr(pdata, addr);
 	*rx = ICM_DROP_COUNT(count);
 	*tx = ECM_DROP_COUNT(count);
 	/* Errata: 10GE_4 - ICM_ECM_DROP_COUNT not clear-on-read */
 	addr = (pdata->enet_id != XGENE_ENET1) ?
 		XG_MCX_ECM_CONFIG0_REG_0_ADDR :
 		ECM_CONFIG0_REG_0_ADDR + pdata->port_id * OFFSET_4;
 	xgene_enet_rd_mcx_csr(pdata, addr);
 }

 static void xgene_enet_config_ring_if_assoc(struct xgene_enet_pdata *p)
 {
 	u32 val;

 	val = (p->enet_id == XGENE_ENET1) ? 0xffffffff : 0;
 	xgene_enet_wr_ring_if(p, ENET_CFGSSQMIWQASSOC_ADDR, val);
 	xgene_enet_wr_ring_if(p, ENET_CFGSSQMIFPQASSOC_ADDR, val);
 }

 static void xgene_mii_phy_write(struct xgene_enet_pdata *p, u8 phy_id,
 				u32 reg, u16 data)
 {
 	u32 addr, wr_data, done;
 	int i;

 	addr = PHY_ADDR(phy_id) | REG_ADDR(reg);
 	xgene_enet_wr_mac(p, MII_MGMT_ADDRESS_ADDR, addr);

 	wr_data = PHY_CONTROL(data);
 	xgene_enet_wr_mac(p, MII_MGMT_CONTROL_ADDR, wr_data);

 	for (i = 0; i < 10; i++) {
 		done = xgene_enet_rd_mac(p, MII_MGMT_INDICATORS_ADDR);
 		if (!(done & BUSY_MASK))
 			return;
 		usleep_range(10, 20);
 	}

 	netdev_err(p->ndev, "MII_MGMT write failed\n");
 }

 static u32 xgene_mii_phy_read(struct xgene_enet_pdata *p, u8 phy_id, u32 reg)
 {
 	u32 addr, data, done;
 	int i;

 	addr = PHY_ADDR(phy_id) | REG_ADDR(reg);
 	xgene_enet_wr_mac(p, MII_MGMT_ADDRESS_ADDR, addr);
 	xgene_enet_wr_mac(p, MII_MGMT_COMMAND_ADDR, READ_CYCLE_MASK);

 	for (i = 0; i < 10; i++) {
 		done = xgene_enet_rd_mac(p, MII_MGMT_INDICATORS_ADDR);
 		if (!(done & BUSY_MASK)) {
 			data = xgene_enet_rd_mac(p, MII_MGMT_STATUS_ADDR);
 			xgene_enet_wr_mac(p, MII_MGMT_COMMAND_ADDR, 0);

 			return data;
 		}
 		usleep_range(10, 20);
 	}

 	netdev_err(p->ndev, "MII_MGMT read failed\n");

 	return 0;
 }

 static void xgene_sgmac_reset(struct xgene_enet_pdata *p)
 {
 	xgene_enet_wr_mac(p, MAC_CONFIG_1_ADDR, SOFT_RESET1);
 	xgene_enet_wr_mac(p, MAC_CONFIG_1_ADDR, 0);
 }

 static void xgene_sgmac_set_mac_addr(struct xgene_enet_pdata *p)
 {
 	u32 addr0, addr1;
 	u8 *dev_addr = p->ndev->dev_addr;

 	addr0 = (dev_addr[3] << 24) | (dev_addr[2] << 16) |
 		(dev_addr[1] << 8) | dev_addr[0];
 	xgene_enet_wr_mac(p, STATION_ADDR0_ADDR, addr0);

 	addr1 = xgene_enet_rd_mac(p, STATION_ADDR1_ADDR);
 	addr1 |= (dev_addr[5] << 24) | (dev_addr[4] << 16);
 	xgene_enet_wr_mac(p, STATION_ADDR1_ADDR, addr1);
 }

 static u32 xgene_enet_link_status(struct xgene_enet_pdata *p)
 {
 	u32 data;

 	data = xgene_mii_phy_read(p, INT_PHY_ADDR,
 				  SGMII_BASE_PAGE_ABILITY_ADDR >> 2);

 	if (LINK_SPEED(data) == PHY_SPEED_1000)
 		p->phy_speed = SPEED_1000;
 	else if (LINK_SPEED(data) == PHY_SPEED_100)
 		p->phy_speed = SPEED_100;
 	else
 		p->phy_speed = SPEED_10;

 	return data & LINK_UP;
 }

 static void xgene_sgmii_configure(struct xgene_enet_pdata *p)
 {
 	xgene_mii_phy_write(p, INT_PHY_ADDR, SGMII_TBI_CONTROL_ADDR >> 2,
 			    0x8000);
 	xgene_mii_phy_write(p, INT_PHY_ADDR, SGMII_CONTROL_ADDR >> 2, 0x9000);
 	xgene_mii_phy_write(p, INT_PHY_ADDR, SGMII_TBI_CONTROL_ADDR >> 2, 0);
 }

 static void xgene_sgmii_tbi_control_reset(struct xgene_enet_pdata *p)
 {
 	xgene_mii_phy_write(p, INT_PHY_ADDR, SGMII_TBI_CONTROL_ADDR >> 2,
 			    0x8000);
 	xgene_mii_phy_write(p, INT_PHY_ADDR, SGMII_TBI_CONTROL_ADDR >> 2, 0);
 }

 static void xgene_sgmii_reset(struct xgene_enet_pdata *p)
 {
 	u32 value;

 	if (p->phy_speed == SPEED_UNKNOWN)
 		return;

 	value = xgene_mii_phy_read(p, INT_PHY_ADDR,
 				   SGMII_BASE_PAGE_ABILITY_ADDR >> 2);
 	if (!(value & LINK_UP))
 		xgene_sgmii_tbi_control_reset(p);
 }

 static void xgene_sgmac_set_speed(struct xgene_enet_pdata *p)
 {
 	u32 icm0_addr, icm2_addr, debug_addr;
 	u32 icm0, icm2, intf_ctl;
 	u32 mc2, value;

 	xgene_sgmii_reset(p);

 	if (p->enet_id == XGENE_ENET1) {
 		icm0_addr = ICM_CONFIG0_REG_0_ADDR + p->port_id * OFFSET_8;
 		icm2_addr = ICM_CONFIG2_REG_0_ADDR + p->port_id * OFFSET_4;
 		debug_addr = DEBUG_REG_ADDR;
 	} else {
 		icm0_addr = XG_MCX_ICM_CONFIG0_REG_0_ADDR;
 		icm2_addr = XG_MCX_ICM_CONFIG2_REG_0_ADDR;
 		debug_addr = XG_DEBUG_REG_ADDR;
 	}

 	icm0 = xgene_enet_rd_mcx_csr(p, icm0_addr);
 	icm2 = xgene_enet_rd_mcx_csr(p, icm2_addr);
 	mc2 = xgene_enet_rd_mac(p, MAC_CONFIG_2_ADDR);
 	intf_ctl = xgene_enet_rd_mac(p, INTERFACE_CONTROL_ADDR);

 	switch (p->phy_speed) {
 	case SPEED_10:
 		ENET_INTERFACE_MODE2_SET(&mc2, 1);
 		intf_ctl &= ~(ENET_LHD_MODE | ENET_GHD_MODE);
 		CFG_MACMODE_SET(&icm0, 0);
 		CFG_WAITASYNCRD_SET(&icm2, 500);
 		break;
 	case SPEED_100:
 		ENET_INTERFACE_MODE2_SET(&mc2, 1);
 		intf_ctl &= ~ENET_GHD_MODE;
 		intf_ctl |= ENET_LHD_MODE;
 		CFG_MACMODE_SET(&icm0, 1);
 		CFG_WAITASYNCRD_SET(&icm2, 80);
 		break;
 	default:
 		ENET_INTERFACE_MODE2_SET(&mc2, 2);
 		intf_ctl &= ~ENET_LHD_MODE;
 		intf_ctl |= ENET_GHD_MODE;
 		CFG_MACMODE_SET(&icm0, 2);
 		CFG_WAITASYNCRD_SET(&icm2, 16);
 		value = xgene_enet_rd_csr(p, debug_addr);
 		value |= CFG_BYPASS_UNISEC_TX | CFG_BYPASS_UNISEC_RX;
 		xgene_enet_wr_csr(p, debug_addr, value);
 		break;
 	}

 	mc2 |= FULL_DUPLEX2 | PAD_CRC;
 	xgene_enet_wr_mac(p, MAC_CONFIG_2_ADDR, mc2);
 	xgene_enet_wr_mac(p, INTERFACE_CONTROL_ADDR, intf_ctl);
 	xgene_enet_wr_mcx_csr(p, icm0_addr, icm0);
 	xgene_enet_wr_mcx_csr(p, icm2_addr, icm2);
 }

 static void xgene_sgmac_set_frame_size(struct xgene_enet_pdata *pdata, int size)
 {
 	xgene_enet_wr_mac(pdata, MAX_FRAME_LEN_ADDR, size);
 }

 static void xgene_sgmii_enable_autoneg(struct xgene_enet_pdata *p)
 {
 	u32 data, loop = 10;

 	xgene_sgmii_configure(p);

 	while (loop--) {
 		data = xgene_mii_phy_read(p, INT_PHY_ADDR,
 					  SGMII_STATUS_ADDR >> 2);
 		if ((data & AUTO_NEG_COMPLETE) && (data & LINK_STATUS))
 			break;
 		usleep_range(1000, 2000);
 	}
 	if (!(data & AUTO_NEG_COMPLETE) || !(data & LINK_STATUS))
 		netdev_err(p->ndev, "Auto-negotiation failed\n");
 }

 static void xgene_sgmac_rxtx(struct xgene_enet_pdata *p, u32 bits, bool set)
 {
 	u32 data;

 	data = xgene_enet_rd_mac(p, MAC_CONFIG_1_ADDR);

 	if (set)
 		data |= bits;
 	else
 		data &= ~bits;

 	xgene_enet_wr_mac(p, MAC_CONFIG_1_ADDR, data);
 }

 static void xgene_sgmac_flowctl_tx(struct xgene_enet_pdata *p, bool enable)
 {
 	xgene_sgmac_rxtx(p, TX_FLOW_EN, enable);

 	p->mac_ops->enable_tx_pause(p, enable);
 }

 static void xgene_sgmac_flowctl_rx(struct xgene_enet_pdata *pdata, bool enable)
 {
 	xgene_sgmac_rxtx(pdata, RX_FLOW_EN, enable);
 }

 static void xgene_sgmac_init(struct xgene_enet_pdata *p)
 {
 	u32 pause_thres_reg, pause_off_thres_reg;
 	u32 enet_spare_cfg_reg, rsif_config_reg;
 	u32 cfg_bypass_reg, rx_dv_gate_reg;
 	u32 data, data1, data2, offset;
 	u32 multi_dpf_reg;

 	if (!(p->enet_id == XGENE_ENET2 && p->mdio_driver))
 		xgene_sgmac_reset(p);

 	xgene_sgmii_enable_autoneg(p);
 	xgene_sgmac_set_speed(p);
 	xgene_sgmac_set_mac_addr(p);

 	if (p->enet_id == XGENE_ENET1) {
 		enet_spare_cfg_reg = ENET_SPARE_CFG_REG_ADDR;
 		rsif_config_reg = RSIF_CONFIG_REG_ADDR;
 		cfg_bypass_reg = CFG_BYPASS_ADDR;
 		offset = p->port_id * OFFSET_4;
 		rx_dv_gate_reg = SG_RX_DV_GATE_REG_0_ADDR + offset;
 	} else {
 		enet_spare_cfg_reg = XG_ENET_SPARE_CFG_REG_ADDR;
 		rsif_config_reg = XG_RSIF_CONFIG_REG_ADDR;
 		cfg_bypass_reg = XG_CFG_BYPASS_ADDR;
 		rx_dv_gate_reg = XG_MCX_RX_DV_GATE_REG_0_ADDR;
 	}

 	data = xgene_enet_rd_csr(p, enet_spare_cfg_reg);
 	data |= MPA_IDLE_WITH_QMI_EMPTY;
 	xgene_enet_wr_csr(p, enet_spare_cfg_reg, data);

 	/* Adjust MDC clock frequency */
 	data = xgene_enet_rd_mac(p, MII_MGMT_CONFIG_ADDR);
 	MGMT_CLOCK_SEL_SET(&data, 7);
 	xgene_enet_wr_mac(p, MII_MGMT_CONFIG_ADDR, data);

 	/* Enable drop if bufpool not available */
 	data = xgene_enet_rd_csr(p, rsif_config_reg);
 	data |= CFG_RSIF_FPBUFF_TIMEOUT_EN;
 	xgene_enet_wr_csr(p, rsif_config_reg, data);

 	/* Configure HW pause frame generation */
 	multi_dpf_reg = (p->enet_id == XGENE_ENET1) ? CSR_MULTI_DPF0_ADDR :
 			 XG_MCX_MULTI_DPF0_ADDR;
 	data = xgene_enet_rd_mcx_csr(p, multi_dpf_reg);
 	data = (DEF_QUANTA << 16) | (data & 0xffff);
 	xgene_enet_wr_mcx_csr(p, multi_dpf_reg, data);

 	if (p->enet_id != XGENE_ENET1) {
 		data = xgene_enet_rd_mcx_csr(p, XG_MCX_MULTI_DPF1_ADDR);
 		data =  (NORM_PAUSE_OPCODE << 16) | (data & 0xFFFF);
 		xgene_enet_wr_mcx_csr(p, XG_MCX_MULTI_DPF1_ADDR, data);
 	}

 	pause_thres_reg = (p->enet_id == XGENE_ENET1) ? RXBUF_PAUSE_THRESH :
 			   XG_RXBUF_PAUSE_THRESH;
 	pause_off_thres_reg = (p->enet_id == XGENE_ENET1) ?
 			       RXBUF_PAUSE_OFF_THRESH : 0;

 	if (p->enet_id == XGENE_ENET1) {
 		data1 = xgene_enet_rd_csr(p, pause_thres_reg);
 		data2 = xgene_enet_rd_csr(p, pause_off_thres_reg);

 		if (!(p->port_id % 2)) {
 			data1 = (data1 & 0xffff0000) | DEF_PAUSE_THRES;
 			data2 = (data2 & 0xffff0000) | DEF_PAUSE_OFF_THRES;
 		} else {
 			data1 = (data1 & 0xffff) | (DEF_PAUSE_THRES << 16);
 			data2 = (data2 & 0xffff) | (DEF_PAUSE_OFF_THRES << 16);
 		}

 		xgene_enet_wr_csr(p, pause_thres_reg, data1);
 		xgene_enet_wr_csr(p, pause_off_thres_reg, data2);
 	} else {
 		data = (DEF_PAUSE_OFF_THRES << 16) | DEF_PAUSE_THRES;
 		xgene_enet_wr_csr(p, pause_thres_reg, data);
 	}

 	xgene_sgmac_flowctl_tx(p, p->tx_pause);
 	xgene_sgmac_flowctl_rx(p, p->rx_pause);

 	/* Bypass traffic gating */
 	xgene_enet_wr_csr(p, XG_ENET_SPARE_CFG_REG_1_ADDR, 0x84);
 	xgene_enet_wr_csr(p, cfg_bypass_reg, RESUME_TX);
 	xgene_enet_wr_mcx_csr(p, rx_dv_gate_reg, RESUME_RX0);
 }

 static void xgene_sgmac_rx_enable(struct xgene_enet_pdata *p)
 {
 	xgene_sgmac_rxtx(p, RX_EN, true);
 }

 static void xgene_sgmac_tx_enable(struct xgene_enet_pdata *p)
 {
 	xgene_sgmac_rxtx(p, TX_EN, true);
 }

 static void xgene_sgmac_rx_disable(struct xgene_enet_pdata *p)
 {
 	xgene_sgmac_rxtx(p, RX_EN, false);
 }

 static void xgene_sgmac_tx_disable(struct xgene_enet_pdata *p)
 {
 	xgene_sgmac_rxtx(p, TX_EN, false);
 }

 static int xgene_enet_reset(struct xgene_enet_pdata *p)
 {
 	struct device *dev = &p->pdev->dev;

 	if (!xgene_ring_mgr_init(p))
 		return -ENODEV;

 	if (p->mdio_driver && p->enet_id == XGENE_ENET2) {
 		xgene_enet_config_ring_if_assoc(p);
 		return 0;
 	}

 	if (p->enet_id == XGENE_ENET2)
 		xgene_enet_wr_clkrst_csr(p, XGENET_CONFIG_REG_ADDR, SGMII_EN);

 	if (dev->of_node) {
 		if (!IS_ERR(p->clk)) {
 			clk_prepare_enable(p->clk);
 			udelay(5);
 			clk_disable_unprepare(p->clk);
 			udelay(5);
 			clk_prepare_enable(p->clk);
 			udelay(5);
 		}
 	} else {
 #ifdef CONFIG_ACPI
 		if (acpi_has_method(ACPI_HANDLE(&p->pdev->dev), "_RST"))
 			acpi_evaluate_object(ACPI_HANDLE(&p->pdev->dev),
 					     "_RST", NULL, NULL);
 		else if (acpi_has_method(ACPI_HANDLE(&p->pdev->dev), "_INI"))
 			acpi_evaluate_object(ACPI_HANDLE(&p->pdev->dev),
 					     "_INI", NULL, NULL);
 #endif
 	}

 	if (!p->port_id) {
 		xgene_enet_ecc_init(p);
 		xgene_enet_config_ring_if_assoc(p);
 	}

 	return 0;
 }

 static void xgene_enet_cle_bypass(struct xgene_enet_pdata *p,
 				  u32 dst_ring_num, u16 bufpool_id,
 				  u16 nxtbufpool_id)
 {
 	u32 cle_bypass_reg0, cle_bypass_reg1;
 	u32 offset = p->port_id * MAC_OFFSET;
 	u32 data, fpsel, nxtfpsel;

 	if (p->enet_id == XGENE_ENET1) {
 		cle_bypass_reg0 = CLE_BYPASS_REG0_0_ADDR;
 		cle_bypass_reg1 = CLE_BYPASS_REG1_0_ADDR;
 	} else {
 		cle_bypass_reg0 = XCLE_BYPASS_REG0_ADDR;
 		cle_bypass_reg1 = XCLE_BYPASS_REG1_ADDR;
 	}

 	data = CFG_CLE_BYPASS_EN0;
 	xgene_enet_wr_csr(p, cle_bypass_reg0 + offset, data);

 	fpsel = xgene_enet_get_fpsel(bufpool_id);
 	nxtfpsel = xgene_enet_get_fpsel(nxtbufpool_id);
 	data = CFG_CLE_DSTQID0(dst_ring_num) | CFG_CLE_FPSEL0(fpsel) |
 	       CFG_CLE_NXTFPSEL0(nxtfpsel);
 	xgene_enet_wr_csr(p, cle_bypass_reg1 + offset, data);
 }

 static void xgene_enet_clear(struct xgene_enet_pdata *pdata,
 			     struct xgene_enet_desc_ring *ring)
 {
 	u32 addr, data;

 	if (xgene_enet_is_bufpool(ring->id)) {
 		addr = ENET_CFGSSQMIFPRESET_ADDR;
 		data = BIT(xgene_enet_get_fpsel(ring->id));
 	} else {
 		addr = ENET_CFGSSQMIWQRESET_ADDR;
 		data = BIT(xgene_enet_ring_bufnum(ring->id));
 	}

 	xgene_enet_wr_ring_if(pdata, addr, data);
 }

 static void xgene_enet_shutdown(struct xgene_enet_pdata *p)
 {
 	struct device *dev = &p->pdev->dev;

 	if (dev->of_node) {
 		if (!IS_ERR(p->clk))
 			clk_disable_unprepare(p->clk);
 	}
 }

 static void xgene_enet_link_state(struct work_struct *work)
 {
 	struct xgene_enet_pdata *p = container_of(to_delayed_work(work),
 				     struct xgene_enet_pdata, link_work);
 	struct net_device *ndev = p->ndev;
 	u32 link, poll_interval;

 	link = xgene_enet_link_status(p);
 	if (link) {
 		if (!netif_carrier_ok(ndev)) {
 			netif_carrier_on(ndev);
 			xgene_sgmac_set_speed(p);
 			xgene_sgmac_rx_enable(p);
 			xgene_sgmac_tx_enable(p);
 			netdev_info(ndev, "Link is Up - %dMbps\n",
 				    p->phy_speed);
 		}
 		poll_interval = PHY_POLL_LINK_ON;
 	} else {
 		if (netif_carrier_ok(ndev)) {
 			xgene_sgmac_rx_disable(p);
 			xgene_sgmac_tx_disable(p);
 			netif_carrier_off(ndev);
 			netdev_info(ndev, "Link is Down\n");
 		}
 		poll_interval = PHY_POLL_LINK_OFF;
 	}

 	schedule_delayed_work(&p->link_work, poll_interval);
 }

 static void xgene_sgmac_enable_tx_pause(struct xgene_enet_pdata *p, bool enable)
 {
 	u32 data, ecm_cfg_addr;

 	if (p->enet_id == XGENE_ENET1) {
 		ecm_cfg_addr = (!(p->port_id % 2)) ? CSR_ECM_CFG_0_ADDR :
 				CSR_ECM_CFG_1_ADDR;
 	} else {
 		ecm_cfg_addr = XG_MCX_ECM_CFG_0_ADDR;
 	}

 	data = xgene_enet_rd_mcx_csr(p, ecm_cfg_addr);
 	if (enable)
 		data |= MULTI_DPF_AUTOCTRL | PAUSE_XON_EN;
 	else
 		data &= ~(MULTI_DPF_AUTOCTRL | PAUSE_XON_EN);
 	xgene_enet_wr_mcx_csr(p, ecm_cfg_addr, data);
 }

 const struct xgene_mac_ops xgene_sgmac_ops = {
 	.init		= xgene_sgmac_init,
 	.reset		= xgene_sgmac_reset,
 	.rx_enable	= xgene_sgmac_rx_enable,
 	.tx_enable	= xgene_sgmac_tx_enable,
 	.rx_disable	= xgene_sgmac_rx_disable,
 	.tx_disable	= xgene_sgmac_tx_disable,
 	.get_drop_cnt   = xgene_sgmac_get_drop_cnt,
 	.set_speed	= xgene_sgmac_set_speed,
 	.set_mac_addr	= xgene_sgmac_set_mac_addr,
 	.set_framesize  = xgene_sgmac_set_frame_size,
 	.link_state	= xgene_enet_link_state,
 	.enable_tx_pause = xgene_sgmac_enable_tx_pause,
 	.flowctl_tx     = xgene_sgmac_flowctl_tx,
 	.flowctl_rx     = xgene_sgmac_flowctl_rx
 };

 const struct xgene_port_ops xgene_sgport_ops = {
 	.reset		= xgene_enet_reset,
 	.clear		= xgene_enet_clear,
 	.cle_bypass	= xgene_enet_cle_bypass,
 	.shutdown	= xgene_enet_shutdown
 };
	/* Applied Micro X-Gene SoC Ethernet Driver
	*
	* Copyright (c) 2014, Applied Micro Circuits Corporation
	* Authors: Iyappan Subramanian <isubramanian@apm.com>
	* Keyur Chudgar <kchudgar@apm.com>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*
	* This program is distributed in the hope that 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 "xgene_enet_main.h"
	#include "xgene_enet_hw.h"
	#include "xgene_enet_sgmac.h"
	#include "xgene_enet_xgmac.h"

	static void xgene_enet_wr_csr(struct xgene_enet_pdata *p, u32 offset, u32 val)
	{
	iowrite32(val, p->eth_csr_addr + offset);
	}

	static void xgene_enet_wr_clkrst_csr(struct xgene_enet_pdata *p, u32 offset,
	u32 val)
	{
	iowrite32(val, p->base_addr + offset);
	}

	static void xgene_enet_wr_ring_if(struct xgene_enet_pdata *p,
	u32 offset, u32 val)
	{
	iowrite32(val, p->eth_ring_if_addr + offset);
	}

	static void xgene_enet_wr_diag_csr(struct xgene_enet_pdata *p,
	u32 offset, u32 val)
	{
	iowrite32(val, p->eth_diag_csr_addr + offset);
	}

	static void xgene_enet_wr_mcx_csr(struct xgene_enet_pdata *pdata,
	u32 offset, u32 val)
	{
	void __iomem *addr = pdata->mcx_mac_csr_addr + offset;

	iowrite32(val, addr);
	}

	static u32 xgene_enet_rd_csr(struct xgene_enet_pdata *p, u32 offset)
	{
	return ioread32(p->eth_csr_addr + offset);
	}

	static u32 xgene_enet_rd_diag_csr(struct xgene_enet_pdata *p, u32 offset)
	{
	return ioread32(p->eth_diag_csr_addr + offset);
	}

	static u32 xgene_enet_rd_mcx_csr(struct xgene_enet_pdata *p, u32 offset)
	{
	return ioread32(p->mcx_mac_csr_addr + offset);
	}

	static int xgene_enet_ecc_init(struct xgene_enet_pdata *p)
	{
	struct net_device *ndev = p->ndev;
	u32 data, shutdown;
	int i = 0;

	shutdown = xgene_enet_rd_diag_csr(p, ENET_CFG_MEM_RAM_SHUTDOWN_ADDR);
	data = xgene_enet_rd_diag_csr(p, ENET_BLOCK_MEM_RDY_ADDR);

	if (!shutdown && data == ~0U) {
	netdev_dbg(ndev, "+ ecc_init done, skipping\n");
	return 0;
	}

	xgene_enet_wr_diag_csr(p, ENET_CFG_MEM_RAM_SHUTDOWN_ADDR, 0);
	do {
	usleep_range(100, 110);
	data = xgene_enet_rd_diag_csr(p, ENET_BLOCK_MEM_RDY_ADDR);
	if (data == ~0U)
	return 0;
	} while (++i < 10);

	netdev_err(ndev, "Failed to release memory from shutdown\n");
	return -ENODEV;
	}

	static void xgene_sgmac_get_drop_cnt(struct xgene_enet_pdata *pdata,
	u32 rx, u32 tx)
	{
	u32 addr, count;

	addr = (pdata->enet_id != XGENE_ENET1) ?
	XG_MCX_ICM_ECM_DROP_COUNT_REG0_ADDR :
	ICM_ECM_DROP_COUNT_REG0_ADDR + pdata->port_id * OFFSET_4;
	count = xgene_enet_rd_mcx_csr(pdata, addr);
	*rx = ICM_DROP_COUNT(count);
	*tx = ECM_DROP_COUNT(count);
	/* Errata: 10GE_4 - ICM_ECM_DROP_COUNT not clear-on-read */
	addr = (pdata->enet_id != XGENE_ENET1) ?
	XG_MCX_ECM_CONFIG0_REG_0_ADDR :
	ECM_CONFIG0_REG_0_ADDR + pdata->port_id * OFFSET_4;
	xgene_enet_rd_mcx_csr(pdata, addr);
	}

	static void xgene_enet_config_ring_if_assoc(struct xgene_enet_pdata *p)
	{
	u32 val;

	val = (p->enet_id == XGENE_ENET1) ? 0xffffffff : 0;
	xgene_enet_wr_ring_if(p, ENET_CFGSSQMIWQASSOC_ADDR, val);
	xgene_enet_wr_ring_if(p, ENET_CFGSSQMIFPQASSOC_ADDR, val);
	}

	static void xgene_mii_phy_write(struct xgene_enet_pdata *p, u8 phy_id,
	u32 reg, u16 data)
	{
	u32 addr, wr_data, done;
	int i;

	addr = PHY_ADDR(phy_id) \| REG_ADDR(reg);
	xgene_enet_wr_mac(p, MII_MGMT_ADDRESS_ADDR, addr);

	wr_data = PHY_CONTROL(data);
	xgene_enet_wr_mac(p, MII_MGMT_CONTROL_ADDR, wr_data);

	for (i = 0; i < 10; i++) {
	done = xgene_enet_rd_mac(p, MII_MGMT_INDICATORS_ADDR);
	if (!(done & BUSY_MASK))
	return;
	usleep_range(10, 20);
	}

	netdev_err(p->ndev, "MII_MGMT write failed\n");
	}

	static u32 xgene_mii_phy_read(struct xgene_enet_pdata *p, u8 phy_id, u32 reg)
	{
	u32 addr, data, done;
	int i;

	addr = PHY_ADDR(phy_id) \| REG_ADDR(reg);
	xgene_enet_wr_mac(p, MII_MGMT_ADDRESS_ADDR, addr);
	xgene_enet_wr_mac(p, MII_MGMT_COMMAND_ADDR, READ_CYCLE_MASK);

	for (i = 0; i < 10; i++) {
	done = xgene_enet_rd_mac(p, MII_MGMT_INDICATORS_ADDR);
	if (!(done & BUSY_MASK)) {
	data = xgene_enet_rd_mac(p, MII_MGMT_STATUS_ADDR);
	xgene_enet_wr_mac(p, MII_MGMT_COMMAND_ADDR, 0);

	return data;
	}
	usleep_range(10, 20);
	}

	netdev_err(p->ndev, "MII_MGMT read failed\n");

	return 0;
	}

	static void xgene_sgmac_reset(struct xgene_enet_pdata *p)
	{
	xgene_enet_wr_mac(p, MAC_CONFIG_1_ADDR, SOFT_RESET1);
	xgene_enet_wr_mac(p, MAC_CONFIG_1_ADDR, 0);
	}

	static void xgene_sgmac_set_mac_addr(struct xgene_enet_pdata *p)
	{
	u32 addr0, addr1;
	u8 *dev_addr = p->ndev->dev_addr;

	addr0 = (dev_addr[3] << 24) \| (dev_addr[2] << 16) \|
	(dev_addr[1] << 8) \| dev_addr[0];
	xgene_enet_wr_mac(p, STATION_ADDR0_ADDR, addr0);

	addr1 = xgene_enet_rd_mac(p, STATION_ADDR1_ADDR);
	addr1 \|= (dev_addr[5] << 24) \| (dev_addr[4] << 16);
	xgene_enet_wr_mac(p, STATION_ADDR1_ADDR, addr1);
	}

	static u32 xgene_enet_link_status(struct xgene_enet_pdata *p)
	{
	u32 data;

	data = xgene_mii_phy_read(p, INT_PHY_ADDR,
	SGMII_BASE_PAGE_ABILITY_ADDR >> 2);

	if (LINK_SPEED(data) == PHY_SPEED_1000)
	p->phy_speed = SPEED_1000;
	else if (LINK_SPEED(data) == PHY_SPEED_100)
	p->phy_speed = SPEED_100;
	else
	p->phy_speed = SPEED_10;

	return data & LINK_UP;
	}

	static void xgene_sgmii_configure(struct xgene_enet_pdata *p)
	{
	xgene_mii_phy_write(p, INT_PHY_ADDR, SGMII_TBI_CONTROL_ADDR >> 2,
	0x8000);
	xgene_mii_phy_write(p, INT_PHY_ADDR, SGMII_CONTROL_ADDR >> 2, 0x9000);
	xgene_mii_phy_write(p, INT_PHY_ADDR, SGMII_TBI_CONTROL_ADDR >> 2, 0);
	}

	static void xgene_sgmii_tbi_control_reset(struct xgene_enet_pdata *p)
	{
	xgene_mii_phy_write(p, INT_PHY_ADDR, SGMII_TBI_CONTROL_ADDR >> 2,
	0x8000);
	xgene_mii_phy_write(p, INT_PHY_ADDR, SGMII_TBI_CONTROL_ADDR >> 2, 0);
	}

	static void xgene_sgmii_reset(struct xgene_enet_pdata *p)
	{
	u32 value;

	if (p->phy_speed == SPEED_UNKNOWN)
	return;

	value = xgene_mii_phy_read(p, INT_PHY_ADDR,
	SGMII_BASE_PAGE_ABILITY_ADDR >> 2);
	if (!(value & LINK_UP))
	xgene_sgmii_tbi_control_reset(p);
	}

	static void xgene_sgmac_set_speed(struct xgene_enet_pdata *p)
	{
	u32 icm0_addr, icm2_addr, debug_addr;
	u32 icm0, icm2, intf_ctl;
	u32 mc2, value;

	xgene_sgmii_reset(p);

	if (p->enet_id == XGENE_ENET1) {
	icm0_addr = ICM_CONFIG0_REG_0_ADDR + p->port_id * OFFSET_8;
	icm2_addr = ICM_CONFIG2_REG_0_ADDR + p->port_id * OFFSET_4;
	debug_addr = DEBUG_REG_ADDR;
	} else {
	icm0_addr = XG_MCX_ICM_CONFIG0_REG_0_ADDR;
	icm2_addr = XG_MCX_ICM_CONFIG2_REG_0_ADDR;
	debug_addr = XG_DEBUG_REG_ADDR;
	}

	icm0 = xgene_enet_rd_mcx_csr(p, icm0_addr);
	icm2 = xgene_enet_rd_mcx_csr(p, icm2_addr);
	mc2 = xgene_enet_rd_mac(p, MAC_CONFIG_2_ADDR);
	intf_ctl = xgene_enet_rd_mac(p, INTERFACE_CONTROL_ADDR);

	switch (p->phy_speed) {
	case SPEED_10:
	ENET_INTERFACE_MODE2_SET(&mc2, 1);
	intf_ctl &= ~(ENET_LHD_MODE \| ENET_GHD_MODE);
	CFG_MACMODE_SET(&icm0, 0);
	CFG_WAITASYNCRD_SET(&icm2, 500);
	break;
	case SPEED_100:
	ENET_INTERFACE_MODE2_SET(&mc2, 1);
	intf_ctl &= ~ENET_GHD_MODE;
	intf_ctl \|= ENET_LHD_MODE;
	CFG_MACMODE_SET(&icm0, 1);
	CFG_WAITASYNCRD_SET(&icm2, 80);
	break;
	default:
	ENET_INTERFACE_MODE2_SET(&mc2, 2);
	intf_ctl &= ~ENET_LHD_MODE;
	intf_ctl \|= ENET_GHD_MODE;
	CFG_MACMODE_SET(&icm0, 2);
	CFG_WAITASYNCRD_SET(&icm2, 16);
	value = xgene_enet_rd_csr(p, debug_addr);
	value \|= CFG_BYPASS_UNISEC_TX \| CFG_BYPASS_UNISEC_RX;
	xgene_enet_wr_csr(p, debug_addr, value);
	break;
	}

	mc2 \|= FULL_DUPLEX2 \| PAD_CRC;
	xgene_enet_wr_mac(p, MAC_CONFIG_2_ADDR, mc2);
	xgene_enet_wr_mac(p, INTERFACE_CONTROL_ADDR, intf_ctl);
	xgene_enet_wr_mcx_csr(p, icm0_addr, icm0);
	xgene_enet_wr_mcx_csr(p, icm2_addr, icm2);
	}

	static void xgene_sgmac_set_frame_size(struct xgene_enet_pdata *pdata, int size)
	{
	xgene_enet_wr_mac(pdata, MAX_FRAME_LEN_ADDR, size);
	}

	static void xgene_sgmii_enable_autoneg(struct xgene_enet_pdata *p)
	{
	u32 data, loop = 10;

	xgene_sgmii_configure(p);

	while (loop--) {
	data = xgene_mii_phy_read(p, INT_PHY_ADDR,
	SGMII_STATUS_ADDR >> 2);
	if ((data & AUTO_NEG_COMPLETE) && (data & LINK_STATUS))
	break;
	usleep_range(1000, 2000);
	}
	if (!(data & AUTO_NEG_COMPLETE) \|\| !(data & LINK_STATUS))
	netdev_err(p->ndev, "Auto-negotiation failed\n");
	}

	static void xgene_sgmac_rxtx(struct xgene_enet_pdata *p, u32 bits, bool set)
	{
	u32 data;

	data = xgene_enet_rd_mac(p, MAC_CONFIG_1_ADDR);

	if (set)
	data \|= bits;
	else
	data &= ~bits;

	xgene_enet_wr_mac(p, MAC_CONFIG_1_ADDR, data);
	}

	static void xgene_sgmac_flowctl_tx(struct xgene_enet_pdata *p, bool enable)
	{
	xgene_sgmac_rxtx(p, TX_FLOW_EN, enable);

	p->mac_ops->enable_tx_pause(p, enable);
	}

	static void xgene_sgmac_flowctl_rx(struct xgene_enet_pdata *pdata, bool enable)
	{
	xgene_sgmac_rxtx(pdata, RX_FLOW_EN, enable);
	}

	static void xgene_sgmac_init(struct xgene_enet_pdata *p)
	{
	u32 pause_thres_reg, pause_off_thres_reg;
	u32 enet_spare_cfg_reg, rsif_config_reg;
	u32 cfg_bypass_reg, rx_dv_gate_reg;
	u32 data, data1, data2, offset;
	u32 multi_dpf_reg;

	if (!(p->enet_id == XGENE_ENET2 && p->mdio_driver))
	xgene_sgmac_reset(p);

	xgene_sgmii_enable_autoneg(p);
	xgene_sgmac_set_speed(p);
	xgene_sgmac_set_mac_addr(p);

	if (p->enet_id == XGENE_ENET1) {
	enet_spare_cfg_reg = ENET_SPARE_CFG_REG_ADDR;
	rsif_config_reg = RSIF_CONFIG_REG_ADDR;
	cfg_bypass_reg = CFG_BYPASS_ADDR;
	offset = p->port_id * OFFSET_4;
	rx_dv_gate_reg = SG_RX_DV_GATE_REG_0_ADDR + offset;
	} else {
	enet_spare_cfg_reg = XG_ENET_SPARE_CFG_REG_ADDR;
	rsif_config_reg = XG_RSIF_CONFIG_REG_ADDR;
	cfg_bypass_reg = XG_CFG_BYPASS_ADDR;
	rx_dv_gate_reg = XG_MCX_RX_DV_GATE_REG_0_ADDR;
	}

	data = xgene_enet_rd_csr(p, enet_spare_cfg_reg);
	data \|= MPA_IDLE_WITH_QMI_EMPTY;
	xgene_enet_wr_csr(p, enet_spare_cfg_reg, data);

	/* Adjust MDC clock frequency */
	data = xgene_enet_rd_mac(p, MII_MGMT_CONFIG_ADDR);
	MGMT_CLOCK_SEL_SET(&data, 7);
	xgene_enet_wr_mac(p, MII_MGMT_CONFIG_ADDR, data);

	/* Enable drop if bufpool not available */
	data = xgene_enet_rd_csr(p, rsif_config_reg);
	data \|= CFG_RSIF_FPBUFF_TIMEOUT_EN;
	xgene_enet_wr_csr(p, rsif_config_reg, data);

	/* Configure HW pause frame generation */
	multi_dpf_reg = (p->enet_id == XGENE_ENET1) ? CSR_MULTI_DPF0_ADDR :
	XG_MCX_MULTI_DPF0_ADDR;
	data = xgene_enet_rd_mcx_csr(p, multi_dpf_reg);
	data = (DEF_QUANTA << 16) \| (data & 0xffff);
	xgene_enet_wr_mcx_csr(p, multi_dpf_reg, data);

	if (p->enet_id != XGENE_ENET1) {
	data = xgene_enet_rd_mcx_csr(p, XG_MCX_MULTI_DPF1_ADDR);
	data = (NORM_PAUSE_OPCODE << 16) \| (data & 0xFFFF);
	xgene_enet_wr_mcx_csr(p, XG_MCX_MULTI_DPF1_ADDR, data);
	}

	pause_thres_reg = (p->enet_id == XGENE_ENET1) ? RXBUF_PAUSE_THRESH :
	XG_RXBUF_PAUSE_THRESH;
	pause_off_thres_reg = (p->enet_id == XGENE_ENET1) ?
	RXBUF_PAUSE_OFF_THRESH : 0;

	if (p->enet_id == XGENE_ENET1) {
	data1 = xgene_enet_rd_csr(p, pause_thres_reg);
	data2 = xgene_enet_rd_csr(p, pause_off_thres_reg);

	if (!(p->port_id % 2)) {
	data1 = (data1 & 0xffff0000) \| DEF_PAUSE_THRES;
	data2 = (data2 & 0xffff0000) \| DEF_PAUSE_OFF_THRES;
	} else {
	data1 = (data1 & 0xffff) \| (DEF_PAUSE_THRES << 16);
	data2 = (data2 & 0xffff) \| (DEF_PAUSE_OFF_THRES << 16);
	}

	xgene_enet_wr_csr(p, pause_thres_reg, data1);
	xgene_enet_wr_csr(p, pause_off_thres_reg, data2);
	} else {
	data = (DEF_PAUSE_OFF_THRES << 16) \| DEF_PAUSE_THRES;
	xgene_enet_wr_csr(p, pause_thres_reg, data);
	}

	xgene_sgmac_flowctl_tx(p, p->tx_pause);
	xgene_sgmac_flowctl_rx(p, p->rx_pause);

	/* Bypass traffic gating */
	xgene_enet_wr_csr(p, XG_ENET_SPARE_CFG_REG_1_ADDR, 0x84);
	xgene_enet_wr_csr(p, cfg_bypass_reg, RESUME_TX);
	xgene_enet_wr_mcx_csr(p, rx_dv_gate_reg, RESUME_RX0);
	}

	static void xgene_sgmac_rx_enable(struct xgene_enet_pdata *p)
	{
	xgene_sgmac_rxtx(p, RX_EN, true);
	}

	static void xgene_sgmac_tx_enable(struct xgene_enet_pdata *p)
	{
	xgene_sgmac_rxtx(p, TX_EN, true);
	}

	static void xgene_sgmac_rx_disable(struct xgene_enet_pdata *p)
	{
	xgene_sgmac_rxtx(p, RX_EN, false);
	}

	static void xgene_sgmac_tx_disable(struct xgene_enet_pdata *p)
	{
	xgene_sgmac_rxtx(p, TX_EN, false);
	}

	static int xgene_enet_reset(struct xgene_enet_pdata *p)
	{
	struct device *dev = &p->pdev->dev;

	if (!xgene_ring_mgr_init(p))
	return -ENODEV;

	if (p->mdio_driver && p->enet_id == XGENE_ENET2) {
	xgene_enet_config_ring_if_assoc(p);
	return 0;
	}

	if (p->enet_id == XGENE_ENET2)
	xgene_enet_wr_clkrst_csr(p, XGENET_CONFIG_REG_ADDR, SGMII_EN);

	if (dev->of_node) {
	if (!IS_ERR(p->clk)) {
	clk_prepare_enable(p->clk);
	udelay(5);
	clk_disable_unprepare(p->clk);
	udelay(5);
	clk_prepare_enable(p->clk);
	udelay(5);
	}
	} else {
	#ifdef CONFIG_ACPI
	if (acpi_has_method(ACPI_HANDLE(&p->pdev->dev), "_RST"))
	acpi_evaluate_object(ACPI_HANDLE(&p->pdev->dev),
	"_RST", NULL, NULL);
	else if (acpi_has_method(ACPI_HANDLE(&p->pdev->dev), "_INI"))
	acpi_evaluate_object(ACPI_HANDLE(&p->pdev->dev),
	"_INI", NULL, NULL);
	#endif
	}

	if (!p->port_id) {
	xgene_enet_ecc_init(p);
	xgene_enet_config_ring_if_assoc(p);
	}

	return 0;
	}

	static void xgene_enet_cle_bypass(struct xgene_enet_pdata *p,
	u32 dst_ring_num, u16 bufpool_id,
	u16 nxtbufpool_id)
	{
	u32 cle_bypass_reg0, cle_bypass_reg1;
	u32 offset = p->port_id * MAC_OFFSET;
	u32 data, fpsel, nxtfpsel;

	if (p->enet_id == XGENE_ENET1) {
	cle_bypass_reg0 = CLE_BYPASS_REG0_0_ADDR;
	cle_bypass_reg1 = CLE_BYPASS_REG1_0_ADDR;
	} else {
	cle_bypass_reg0 = XCLE_BYPASS_REG0_ADDR;
	cle_bypass_reg1 = XCLE_BYPASS_REG1_ADDR;
	}

	data = CFG_CLE_BYPASS_EN0;
	xgene_enet_wr_csr(p, cle_bypass_reg0 + offset, data);

	fpsel = xgene_enet_get_fpsel(bufpool_id);
	nxtfpsel = xgene_enet_get_fpsel(nxtbufpool_id);
	data = CFG_CLE_DSTQID0(dst_ring_num) \| CFG_CLE_FPSEL0(fpsel) \|
	CFG_CLE_NXTFPSEL0(nxtfpsel);
	xgene_enet_wr_csr(p, cle_bypass_reg1 + offset, data);
	}

	static void xgene_enet_clear(struct xgene_enet_pdata *pdata,
	struct xgene_enet_desc_ring *ring)
	{
	u32 addr, data;

	if (xgene_enet_is_bufpool(ring->id)) {
	addr = ENET_CFGSSQMIFPRESET_ADDR;
	data = BIT(xgene_enet_get_fpsel(ring->id));
	} else {
	addr = ENET_CFGSSQMIWQRESET_ADDR;
	data = BIT(xgene_enet_ring_bufnum(ring->id));
	}

	xgene_enet_wr_ring_if(pdata, addr, data);
	}

	static void xgene_enet_shutdown(struct xgene_enet_pdata *p)
	{
	struct device *dev = &p->pdev->dev;

	if (dev->of_node) {
	if (!IS_ERR(p->clk))
	clk_disable_unprepare(p->clk);
	}
	}

	static void xgene_enet_link_state(struct work_struct *work)
	{
	struct xgene_enet_pdata *p = container_of(to_delayed_work(work),
	struct xgene_enet_pdata, link_work);
	struct net_device *ndev = p->ndev;
	u32 link, poll_interval;

	link = xgene_enet_link_status(p);
	if (link) {
	if (!netif_carrier_ok(ndev)) {
	netif_carrier_on(ndev);
	xgene_sgmac_set_speed(p);
	xgene_sgmac_rx_enable(p);
	xgene_sgmac_tx_enable(p);
	netdev_info(ndev, "Link is Up - %dMbps\n",
	p->phy_speed);
	}
	poll_interval = PHY_POLL_LINK_ON;
	} else {
	if (netif_carrier_ok(ndev)) {
	xgene_sgmac_rx_disable(p);
	xgene_sgmac_tx_disable(p);
	netif_carrier_off(ndev);
	netdev_info(ndev, "Link is Down\n");
	}
	poll_interval = PHY_POLL_LINK_OFF;
	}

	schedule_delayed_work(&p->link_work, poll_interval);
	}

	static void xgene_sgmac_enable_tx_pause(struct xgene_enet_pdata *p, bool enable)
	{
	u32 data, ecm_cfg_addr;

	if (p->enet_id == XGENE_ENET1) {
	ecm_cfg_addr = (!(p->port_id % 2)) ? CSR_ECM_CFG_0_ADDR :
	CSR_ECM_CFG_1_ADDR;
	} else {
	ecm_cfg_addr = XG_MCX_ECM_CFG_0_ADDR;
	}

	data = xgene_enet_rd_mcx_csr(p, ecm_cfg_addr);
	if (enable)
	data \|= MULTI_DPF_AUTOCTRL \| PAUSE_XON_EN;
	else
	data &= ~(MULTI_DPF_AUTOCTRL \| PAUSE_XON_EN);
	xgene_enet_wr_mcx_csr(p, ecm_cfg_addr, data);
	}

	const struct xgene_mac_ops xgene_sgmac_ops = {
	.init = xgene_sgmac_init,
	.reset = xgene_sgmac_reset,
	.rx_enable = xgene_sgmac_rx_enable,
	.tx_enable = xgene_sgmac_tx_enable,
	.rx_disable = xgene_sgmac_rx_disable,
	.tx_disable = xgene_sgmac_tx_disable,
	.get_drop_cnt = xgene_sgmac_get_drop_cnt,
	.set_speed = xgene_sgmac_set_speed,
	.set_mac_addr = xgene_sgmac_set_mac_addr,
	.set_framesize = xgene_sgmac_set_frame_size,
	.link_state = xgene_enet_link_state,
	.enable_tx_pause = xgene_sgmac_enable_tx_pause,
	.flowctl_tx = xgene_sgmac_flowctl_tx,
	.flowctl_rx = xgene_sgmac_flowctl_rx
	};

	const struct xgene_port_ops xgene_sgport_ops = {
	.reset = xgene_enet_reset,
	.clear = xgene_enet_clear,
	.cle_bypass = xgene_enet_cle_bypass,
	.shutdown = xgene_enet_shutdown
	};