drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c - kernel/bruno - Git at Google

 /* Copyright Altera Corporation (C) 2014. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License, version 2,
  * as published by the Free Software Foundation.
  *
  * 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/>.
  *
  * Adopted from dwmac-sti.c
  */

 #include <linux/mfd/syscon.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_net.h>
 #include <linux/phy.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
 #include <linux/stmmac.h>

 #include "stmmac.h"
 #include "stmmac_platform.h"

 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII 0x0
 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII 0x1
 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RMII 0x2
 #define SYSMGR_EMACGRP_CTRL_PHYSEL_WIDTH 2
 #define SYSMGR_EMACGRP_CTRL_PHYSEL_MASK 0x00000003

 #define EMAC_SPLITTER_CTRL_REG			0x0
 #define EMAC_SPLITTER_CTRL_SPEED_MASK		0x3
 #define EMAC_SPLITTER_CTRL_SPEED_10		0x2
 #define EMAC_SPLITTER_CTRL_SPEED_100		0x3
 #define EMAC_SPLITTER_CTRL_SPEED_1000		0x0

 struct socfpga_dwmac {
 	int	interface;
 	u32	reg_offset;
 	u32	reg_shift;
 	struct	device *dev;
 	struct regmap *sys_mgr_base_addr;
 	struct reset_control *stmmac_rst;
 	void __iomem *splitter_base;
 };

 static void socfpga_dwmac_fix_mac_speed(void *priv, unsigned int speed)
 {
 	struct socfpga_dwmac *dwmac = (struct socfpga_dwmac *)priv;
 	void __iomem *splitter_base = dwmac->splitter_base;
 	u32 val;

 	if (!splitter_base)
 		return;

 	val = readl(splitter_base + EMAC_SPLITTER_CTRL_REG);
 	val &= ~EMAC_SPLITTER_CTRL_SPEED_MASK;

 	switch (speed) {
 	case 1000:
 		val |= EMAC_SPLITTER_CTRL_SPEED_1000;
 		break;
 	case 100:
 		val |= EMAC_SPLITTER_CTRL_SPEED_100;
 		break;
 	case 10:
 		val |= EMAC_SPLITTER_CTRL_SPEED_10;
 		break;
 	default:
 		return;
 	}

 	writel(val, splitter_base + EMAC_SPLITTER_CTRL_REG);
 }

 static int socfpga_dwmac_parse_data(struct socfpga_dwmac *dwmac, struct device *dev)
 {
 	struct device_node *np = dev->of_node;
 	struct regmap *sys_mgr_base_addr;
 	u32 reg_offset, reg_shift;
 	int ret;
 	struct device_node *np_splitter;
 	struct resource res_splitter;

 	dwmac->stmmac_rst = devm_reset_control_get(dev,
 						  STMMAC_RESOURCE_NAME);
 	if (IS_ERR(dwmac->stmmac_rst)) {
 		dev_info(dev, "Could not get reset control!\n");
 		if (PTR_ERR(dwmac->stmmac_rst) == -EPROBE_DEFER)
 			return -EPROBE_DEFER;
 		dwmac->stmmac_rst = NULL;
 	}

 	dwmac->interface = of_get_phy_mode(np);

 	sys_mgr_base_addr = syscon_regmap_lookup_by_phandle(np, "altr,sysmgr-syscon");
 	if (IS_ERR(sys_mgr_base_addr)) {
 		dev_info(dev, "No sysmgr-syscon node found\n");
 		return PTR_ERR(sys_mgr_base_addr);
 	}

 	ret = of_property_read_u32_index(np, "altr,sysmgr-syscon", 1, &reg_offset);
 	if (ret) {
 		dev_info(dev, "Could not read reg_offset from sysmgr-syscon!\n");
 		return -EINVAL;
 	}

 	ret = of_property_read_u32_index(np, "altr,sysmgr-syscon", 2, &reg_shift);
 	if (ret) {
 		dev_info(dev, "Could not read reg_shift from sysmgr-syscon!\n");
 		return -EINVAL;
 	}

 	np_splitter = of_parse_phandle(np, "altr,emac-splitter", 0);
 	if (np_splitter) {
 		if (of_address_to_resource(np_splitter, 0, &res_splitter)) {
 			dev_info(dev, "Missing emac splitter address\n");
 			return -EINVAL;
 		}

 		dwmac->splitter_base = devm_ioremap_resource(dev, &res_splitter);
 		if (IS_ERR(dwmac->splitter_base)) {
 			dev_info(dev, "Failed to mapping emac splitter\n");
 			return PTR_ERR(dwmac->splitter_base);
 		}
 	}

 	dwmac->reg_offset = reg_offset;
 	dwmac->reg_shift = reg_shift;
 	dwmac->sys_mgr_base_addr = sys_mgr_base_addr;
 	dwmac->dev = dev;

 	return 0;
 }

 static int socfpga_dwmac_setup(struct socfpga_dwmac *dwmac)
 {
 	struct regmap *sys_mgr_base_addr = dwmac->sys_mgr_base_addr;
 	int phymode = dwmac->interface;
 	u32 reg_offset = dwmac->reg_offset;
 	u32 reg_shift = dwmac->reg_shift;
 	u32 ctrl, val;

 	switch (phymode) {
 	case PHY_INTERFACE_MODE_RGMII:
 	case PHY_INTERFACE_MODE_RGMII_ID:
 		val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII;
 		break;
 	case PHY_INTERFACE_MODE_MII:
 	case PHY_INTERFACE_MODE_GMII:
 		val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;
 		break;
 	default:
 		dev_err(dwmac->dev, "bad phy mode %d\n", phymode);
 		return -EINVAL;
 	}

 	/* Overwrite val to GMII if splitter core is enabled. The phymode here
 	 * is the actual phy mode on phy hardware, but phy interface from
 	 * EMAC core is GMII.
 	 */
 	if (dwmac->splitter_base)
 		val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;

 	regmap_read(sys_mgr_base_addr, reg_offset, &ctrl);
 	ctrl &= ~(SYSMGR_EMACGRP_CTRL_PHYSEL_MASK << reg_shift);
 	ctrl |= val << reg_shift;

 	regmap_write(sys_mgr_base_addr, reg_offset, ctrl);
 	return 0;
 }

 static void socfpga_dwmac_exit(struct platform_device *pdev, void *priv)
 {
 	struct socfpga_dwmac	*dwmac = priv;

 	/* On socfpga platform exit, assert and hold reset to the
 	 * enet controller - the default state after a hard reset.
 	 */
 	if (dwmac->stmmac_rst)
 		reset_control_assert(dwmac->stmmac_rst);
 }

 static int socfpga_dwmac_init(struct platform_device *pdev, void *priv)
 {
 	struct socfpga_dwmac	*dwmac = priv;
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct stmmac_priv *stpriv = NULL;
 	int ret = 0;

 	if (ndev)
 		stpriv = netdev_priv(ndev);

 	/* Assert reset to the enet controller before changing the phy mode */
 	if (dwmac->stmmac_rst)
 		reset_control_assert(dwmac->stmmac_rst);

 	/* Setup the phy mode in the system manager registers according to
 	 * devicetree configuration
 	 */
 	ret = socfpga_dwmac_setup(dwmac);

 	/* Deassert reset for the phy configuration to be sampled by
 	 * the enet controller, and operation to start in requested mode
 	 */
 	if (dwmac->stmmac_rst)
 		reset_control_deassert(dwmac->stmmac_rst);

 	/* Before the enet controller is suspended, the phy is suspended.
 	 * This causes the phy clock to be gated. The enet controller is
 	 * resumed before the phy, so the clock is still gated "off" when
 	 * the enet controller is resumed. This code makes sure the phy
 	 * is "resumed" before reinitializing the enet controller since
 	 * the enet controller depends on an active phy clock to complete
 	 * a DMA reset. A DMA reset will "time out" if executed
 	 * with no phy clock input on the Synopsys enet controller.
 	 * Verified through Synopsys Case #8000711656.
 	 *
 	 * Note that the phy clock is also gated when the phy is isolated.
 	 * Phy "suspend" and "isolate" controls are located in phy basic
 	 * control register 0, and can be modified by the phy driver
 	 * framework.
 	 */
 	if (stpriv && stpriv->phydev)
 		phy_resume(stpriv->phydev);

 	return ret;
 }

 static int socfpga_dwmac_probe(struct platform_device *pdev)
 {
 	struct plat_stmmacenet_data *plat_dat;
 	struct stmmac_resources stmmac_res;
 	struct device		*dev = &pdev->dev;
 	int			ret;
 	struct socfpga_dwmac	*dwmac;

 	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
 	if (ret)
 		return ret;

 	plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
 	if (IS_ERR(plat_dat))
 		return PTR_ERR(plat_dat);

 	dwmac = devm_kzalloc(dev, sizeof(*dwmac), GFP_KERNEL);
 	if (!dwmac)
 		return -ENOMEM;

 	ret = socfpga_dwmac_parse_data(dwmac, dev);
 	if (ret) {
 		dev_err(dev, "Unable to parse OF data\n");
 		return ret;
 	}

 	ret = socfpga_dwmac_setup(dwmac);
 	if (ret) {
 		dev_err(dev, "couldn't setup SoC glue (%d)\n", ret);
 		return ret;
 	}

 	plat_dat->bsp_priv = dwmac;
 	plat_dat->init = socfpga_dwmac_init;
 	plat_dat->exit = socfpga_dwmac_exit;
 	plat_dat->fix_mac_speed = socfpga_dwmac_fix_mac_speed;

 	ret = socfpga_dwmac_init(pdev, plat_dat->bsp_priv);
 	if (ret)
 		return ret;

 	return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
 }

 static const struct of_device_id socfpga_dwmac_match[] = {
 	{ .compatible = "altr,socfpga-stmmac" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, socfpga_dwmac_match);

 static struct platform_driver socfpga_dwmac_driver = {
 	.probe  = socfpga_dwmac_probe,
 	.remove = stmmac_pltfr_remove,
 	.driver = {
 		.name           = "socfpga-dwmac",
 		.pm		= &stmmac_pltfr_pm_ops,
 		.of_match_table = socfpga_dwmac_match,
 	},
 };
 module_platform_driver(socfpga_dwmac_driver);

 MODULE_LICENSE("GPL v2");
	/* Copyright Altera Corporation (C) 2014. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License, version 2,
	* as published by the Free Software Foundation.
	*
	* 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/>.
	*
	* Adopted from dwmac-sti.c
	*/

	#include <linux/mfd/syscon.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/of_net.h>
	#include <linux/phy.h>
	#include <linux/regmap.h>
	#include <linux/reset.h>
	#include <linux/stmmac.h>

	#include "stmmac.h"
	#include "stmmac_platform.h"

	#define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII 0x0
	#define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII 0x1
	#define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RMII 0x2
	#define SYSMGR_EMACGRP_CTRL_PHYSEL_WIDTH 2
	#define SYSMGR_EMACGRP_CTRL_PHYSEL_MASK 0x00000003

	#define EMAC_SPLITTER_CTRL_REG 0x0
	#define EMAC_SPLITTER_CTRL_SPEED_MASK 0x3
	#define EMAC_SPLITTER_CTRL_SPEED_10 0x2
	#define EMAC_SPLITTER_CTRL_SPEED_100 0x3
	#define EMAC_SPLITTER_CTRL_SPEED_1000 0x0

	struct socfpga_dwmac {
	int interface;
	u32 reg_offset;
	u32 reg_shift;
	struct device *dev;
	struct regmap *sys_mgr_base_addr;
	struct reset_control *stmmac_rst;
	void __iomem *splitter_base;
	};

	static void socfpga_dwmac_fix_mac_speed(void *priv, unsigned int speed)
	{
	struct socfpga_dwmac dwmac = (struct socfpga_dwmac )priv;
	void __iomem *splitter_base = dwmac->splitter_base;
	u32 val;

	if (!splitter_base)
	return;

	val = readl(splitter_base + EMAC_SPLITTER_CTRL_REG);
	val &= ~EMAC_SPLITTER_CTRL_SPEED_MASK;

	switch (speed) {
	case 1000:
	val \|= EMAC_SPLITTER_CTRL_SPEED_1000;
	break;
	case 100:
	val \|= EMAC_SPLITTER_CTRL_SPEED_100;
	break;
	case 10:
	val \|= EMAC_SPLITTER_CTRL_SPEED_10;
	break;
	default:
	return;
	}

	writel(val, splitter_base + EMAC_SPLITTER_CTRL_REG);
	}

	static int socfpga_dwmac_parse_data(struct socfpga_dwmac dwmac, struct device dev)
	{
	struct device_node *np = dev->of_node;
	struct regmap *sys_mgr_base_addr;
	u32 reg_offset, reg_shift;
	int ret;
	struct device_node *np_splitter;
	struct resource res_splitter;

	dwmac->stmmac_rst = devm_reset_control_get(dev,
	STMMAC_RESOURCE_NAME);
	if (IS_ERR(dwmac->stmmac_rst)) {
	dev_info(dev, "Could not get reset control!\n");
	if (PTR_ERR(dwmac->stmmac_rst) == -EPROBE_DEFER)
	return -EPROBE_DEFER;
	dwmac->stmmac_rst = NULL;
	}

	dwmac->interface = of_get_phy_mode(np);

	sys_mgr_base_addr = syscon_regmap_lookup_by_phandle(np, "altr,sysmgr-syscon");
	if (IS_ERR(sys_mgr_base_addr)) {
	dev_info(dev, "No sysmgr-syscon node found\n");
	return PTR_ERR(sys_mgr_base_addr);
	}

	ret = of_property_read_u32_index(np, "altr,sysmgr-syscon", 1, &reg_offset);
	if (ret) {
	dev_info(dev, "Could not read reg_offset from sysmgr-syscon!\n");
	return -EINVAL;
	}

	ret = of_property_read_u32_index(np, "altr,sysmgr-syscon", 2, &reg_shift);
	if (ret) {
	dev_info(dev, "Could not read reg_shift from sysmgr-syscon!\n");
	return -EINVAL;
	}

	np_splitter = of_parse_phandle(np, "altr,emac-splitter", 0);
	if (np_splitter) {
	if (of_address_to_resource(np_splitter, 0, &res_splitter)) {
	dev_info(dev, "Missing emac splitter address\n");
	return -EINVAL;
	}

	dwmac->splitter_base = devm_ioremap_resource(dev, &res_splitter);
	if (IS_ERR(dwmac->splitter_base)) {
	dev_info(dev, "Failed to mapping emac splitter\n");
	return PTR_ERR(dwmac->splitter_base);
	}
	}

	dwmac->reg_offset = reg_offset;
	dwmac->reg_shift = reg_shift;
	dwmac->sys_mgr_base_addr = sys_mgr_base_addr;
	dwmac->dev = dev;

	return 0;
	}

	static int socfpga_dwmac_setup(struct socfpga_dwmac *dwmac)
	{
	struct regmap *sys_mgr_base_addr = dwmac->sys_mgr_base_addr;
	int phymode = dwmac->interface;
	u32 reg_offset = dwmac->reg_offset;
	u32 reg_shift = dwmac->reg_shift;
	u32 ctrl, val;

	switch (phymode) {
	case PHY_INTERFACE_MODE_RGMII:
	case PHY_INTERFACE_MODE_RGMII_ID:
	val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII;
	break;
	case PHY_INTERFACE_MODE_MII:
	case PHY_INTERFACE_MODE_GMII:
	val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;
	break;
	default:
	dev_err(dwmac->dev, "bad phy mode %d\n", phymode);
	return -EINVAL;
	}

	/* Overwrite val to GMII if splitter core is enabled. The phymode here
	* is the actual phy mode on phy hardware, but phy interface from
	* EMAC core is GMII.
	*/
	if (dwmac->splitter_base)
	val = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;

	regmap_read(sys_mgr_base_addr, reg_offset, &ctrl);
	ctrl &= ~(SYSMGR_EMACGRP_CTRL_PHYSEL_MASK << reg_shift);
	ctrl \|= val << reg_shift;

	regmap_write(sys_mgr_base_addr, reg_offset, ctrl);
	return 0;
	}

	static void socfpga_dwmac_exit(struct platform_device pdev, void priv)
	{
	struct socfpga_dwmac *dwmac = priv;

	/* On socfpga platform exit, assert and hold reset to the
	* enet controller - the default state after a hard reset.
	*/
	if (dwmac->stmmac_rst)
	reset_control_assert(dwmac->stmmac_rst);
	}

	static int socfpga_dwmac_init(struct platform_device pdev, void priv)
	{
	struct socfpga_dwmac *dwmac = priv;
	struct net_device *ndev = platform_get_drvdata(pdev);
	struct stmmac_priv *stpriv = NULL;
	int ret = 0;

	if (ndev)
	stpriv = netdev_priv(ndev);

	/* Assert reset to the enet controller before changing the phy mode */
	if (dwmac->stmmac_rst)
	reset_control_assert(dwmac->stmmac_rst);

	/* Setup the phy mode in the system manager registers according to
	* devicetree configuration
	*/
	ret = socfpga_dwmac_setup(dwmac);

	/* Deassert reset for the phy configuration to be sampled by
	* the enet controller, and operation to start in requested mode
	*/
	if (dwmac->stmmac_rst)
	reset_control_deassert(dwmac->stmmac_rst);

	/* Before the enet controller is suspended, the phy is suspended.
	* This causes the phy clock to be gated. The enet controller is
	* resumed before the phy, so the clock is still gated "off" when
	* the enet controller is resumed. This code makes sure the phy
	* is "resumed" before reinitializing the enet controller since
	* the enet controller depends on an active phy clock to complete
	* a DMA reset. A DMA reset will "time out" if executed
	* with no phy clock input on the Synopsys enet controller.
	* Verified through Synopsys Case #8000711656.
	*
	* Note that the phy clock is also gated when the phy is isolated.
	* Phy "suspend" and "isolate" controls are located in phy basic
	* control register 0, and can be modified by the phy driver
	* framework.
	*/
	if (stpriv && stpriv->phydev)
	phy_resume(stpriv->phydev);

	return ret;
	}

	static int socfpga_dwmac_probe(struct platform_device *pdev)
	{
	struct plat_stmmacenet_data *plat_dat;
	struct stmmac_resources stmmac_res;
	struct device *dev = &pdev->dev;
	int ret;
	struct socfpga_dwmac *dwmac;

	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
	if (ret)
	return ret;

	plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
	if (IS_ERR(plat_dat))
	return PTR_ERR(plat_dat);

	dwmac = devm_kzalloc(dev, sizeof(*dwmac), GFP_KERNEL);
	if (!dwmac)
	return -ENOMEM;

	ret = socfpga_dwmac_parse_data(dwmac, dev);
	if (ret) {
	dev_err(dev, "Unable to parse OF data\n");
	return ret;
	}

	ret = socfpga_dwmac_setup(dwmac);
	if (ret) {
	dev_err(dev, "couldn't setup SoC glue (%d)\n", ret);
	return ret;
	}

	plat_dat->bsp_priv = dwmac;
	plat_dat->init = socfpga_dwmac_init;
	plat_dat->exit = socfpga_dwmac_exit;
	plat_dat->fix_mac_speed = socfpga_dwmac_fix_mac_speed;

	ret = socfpga_dwmac_init(pdev, plat_dat->bsp_priv);
	if (ret)
	return ret;

	return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
	}

	static const struct of_device_id socfpga_dwmac_match[] = {
	{ .compatible = "altr,socfpga-stmmac" },
	{ }
	};
	MODULE_DEVICE_TABLE(of, socfpga_dwmac_match);

	static struct platform_driver socfpga_dwmac_driver = {
	.probe = socfpga_dwmac_probe,
	.remove = stmmac_pltfr_remove,
	.driver = {
	.name = "socfpga-dwmac",
	.pm = &stmmac_pltfr_pm_ops,
	.of_match_table = socfpga_dwmac_match,
	},
	};
	module_platform_driver(socfpga_dwmac_driver);

	MODULE_LICENSE("GPL v2");