1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Adaptrum Anarion DWMAC glue layer
  4 *
  5 * Copyright (C) 2017, Adaptrum, Inc.
  6 * (Written by Alexandru Gagniuc <alex.g at adaptrum.com> for Adaptrum, Inc.)
  7 */
  8
  9#include <linux/io.h>
 10#include <linux/of.h>
 11#include <linux/of_net.h>
 12#include <linux/stmmac.h>
 13
 14#include "stmmac.h"
 15#include "stmmac_platform.h"
 16
 17#define GMAC_RESET_CONTROL_REG		0
 18#define GMAC_SW_CONFIG_REG		4
 19#define  GMAC_CONFIG_INTF_SEL_MASK	(0x7 << 0)
 20#define  GMAC_CONFIG_INTF_RGMII		(0x1 << 0)
 21
 22struct anarion_gmac {
 23	uintptr_t ctl_block;
 24	uint32_t phy_intf_sel;
 25};
 26
 27static uint32_t gmac_read_reg(struct anarion_gmac *gmac, uint8_t reg)
 28{
 29	return readl((void *)(gmac->ctl_block + reg));
 30};
 31
 32static void gmac_write_reg(struct anarion_gmac *gmac, uint8_t reg, uint32_t val)
 33{
 34	writel(val, (void *)(gmac->ctl_block + reg));
 35}
 36
 37static int anarion_gmac_init(struct platform_device *pdev, void *priv)
 38{
 39	uint32_t sw_config;
 40	struct anarion_gmac *gmac = priv;
 41
 42	/* Reset logic, configure interface mode, then release reset. SIMPLE! */
 43	gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 1);
 44
 45	sw_config = gmac_read_reg(gmac, GMAC_SW_CONFIG_REG);
 46	sw_config &= ~GMAC_CONFIG_INTF_SEL_MASK;
 47	sw_config |= (gmac->phy_intf_sel & GMAC_CONFIG_INTF_SEL_MASK);
 48	gmac_write_reg(gmac, GMAC_SW_CONFIG_REG, sw_config);
 49
 50	gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 0);
 51
 52	return 0;
 53}
 54
 55static void anarion_gmac_exit(struct platform_device *pdev, void *priv)
 56{
 57	struct anarion_gmac *gmac = priv;
 58
 59	gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 1);
 60}
 61
 62static struct anarion_gmac *anarion_config_dt(struct platform_device *pdev)
 63{
 64	int phy_mode;
 65	void __iomem *ctl_block;
 66	struct anarion_gmac *gmac;
 67
 68	ctl_block = devm_platform_ioremap_resource(pdev, 1);
 69	if (IS_ERR(ctl_block)) {
 70		dev_err(&pdev->dev, "Cannot get reset region (%ld)!\n",
 71			PTR_ERR(ctl_block));
 72		return ctl_block;
 73	}
 74
 75	gmac = devm_kzalloc(&pdev->dev, sizeof(*gmac), GFP_KERNEL);
 76	if (!gmac)
 77		return ERR_PTR(-ENOMEM);
 78
 79	gmac->ctl_block = (uintptr_t)ctl_block;
 80
 81	phy_mode = of_get_phy_mode(pdev->dev.of_node);
 82	switch (phy_mode) {
 83	case PHY_INTERFACE_MODE_RGMII:		/* Fall through */
 84	case PHY_INTERFACE_MODE_RGMII_ID	/* Fall through */:
 85	case PHY_INTERFACE_MODE_RGMII_RXID:	/* Fall through */
 86	case PHY_INTERFACE_MODE_RGMII_TXID:
 87		gmac->phy_intf_sel = GMAC_CONFIG_INTF_RGMII;
 88		break;
 89	default:
 90		dev_err(&pdev->dev, "Unsupported phy-mode (%d)\n",
 91			phy_mode);
 92		return ERR_PTR(-ENOTSUPP);
 93	}
 94
 95	return gmac;
 96}
 97
 98static int anarion_dwmac_probe(struct platform_device *pdev)
 99{
100	int ret;
101	struct anarion_gmac *gmac;
102	struct plat_stmmacenet_data *plat_dat;
103	struct stmmac_resources stmmac_res;
104
105	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
106	if (ret)
107		return ret;
108
109	gmac = anarion_config_dt(pdev);
110	if (IS_ERR(gmac))
111		return PTR_ERR(gmac);
112
113	plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
114	if (IS_ERR(plat_dat))
115		return PTR_ERR(plat_dat);
116
117	plat_dat->init = anarion_gmac_init;
118	plat_dat->exit = anarion_gmac_exit;
119	anarion_gmac_init(pdev, gmac);
120	plat_dat->bsp_priv = gmac;
121
122	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
123	if (ret) {
124		stmmac_remove_config_dt(pdev, plat_dat);
125		return ret;
126	}
127
128	return 0;
129}
130
131static const struct of_device_id anarion_dwmac_match[] = {
132	{ .compatible = "adaptrum,anarion-gmac" },
133	{ }
134};
135MODULE_DEVICE_TABLE(of, anarion_dwmac_match);
136
137static struct platform_driver anarion_dwmac_driver = {
138	.probe  = anarion_dwmac_probe,
139	.remove = stmmac_pltfr_remove,
140	.driver = {
141		.name           = "anarion-dwmac",
142		.pm		= &stmmac_pltfr_pm_ops,
143		.of_match_table = anarion_dwmac_match,
144	},
145};
146module_platform_driver(anarion_dwmac_driver);
147
148MODULE_DESCRIPTION("Adaptrum Anarion DWMAC specific glue layer");
149MODULE_AUTHOR("Alexandru Gagniuc <mr.nuke.me@gmail.com>");
150MODULE_LICENSE("GPL v2");