dwmac-anarion.c

  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	void __iomem *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(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, gmac->ctl_block + reg);
 35}
 36
 37static int anarion_gmac_init(struct device *dev, 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 device *dev, 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 *
 63anarion_config_dt(struct platform_device *pdev,
 64		  struct plat_stmmacenet_data *plat_dat)
 65{
 66	struct anarion_gmac *gmac;
 67	void __iomem *ctl_block;
 68
 69	ctl_block = devm_platform_ioremap_resource(pdev, 1);
 70	if (IS_ERR(ctl_block)) {
 71		dev_err(&pdev->dev, "Cannot get reset region (%pe)!\n",
 72			ctl_block);
 73		return ERR_CAST(ctl_block);
 74	}
 75
 76	gmac = devm_kzalloc(&pdev->dev, sizeof(*gmac), GFP_KERNEL);
 77	if (!gmac)
 78		return ERR_PTR(-ENOMEM);
 79
 80	gmac->ctl_block = ctl_block;
 81
 82	if (phy_interface_mode_is_rgmii(plat_dat->phy_interface)) {
 83		gmac->phy_intf_sel = GMAC_CONFIG_INTF_RGMII;
 84	} else {
 85		dev_err(&pdev->dev, "Unsupported phy-mode (%s)\n",
 86			phy_modes(plat_dat->phy_interface));
 87		return ERR_PTR(-ENOTSUPP);
 88	}
 89
 90	return gmac;
 91}
 92
 93static int anarion_dwmac_probe(struct platform_device *pdev)
 94{
 95	int ret;
 96	struct anarion_gmac *gmac;
 97	struct plat_stmmacenet_data *plat_dat;
 98	struct stmmac_resources stmmac_res;
 99
100	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
101	if (ret)
102		return ret;
103
104	plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
105	if (IS_ERR(plat_dat))
106		return PTR_ERR(plat_dat);
107
108	gmac = anarion_config_dt(pdev, plat_dat);
109	if (IS_ERR(gmac))
110		return PTR_ERR(gmac);
111
112	plat_dat->init = anarion_gmac_init;
113	plat_dat->exit = anarion_gmac_exit;
114	plat_dat->bsp_priv = gmac;
115
116	return devm_stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res);
117}
118
119static const struct of_device_id anarion_dwmac_match[] = {
120	{ .compatible = "adaptrum,anarion-gmac" },
121	{ }
122};
123MODULE_DEVICE_TABLE(of, anarion_dwmac_match);
124
125static struct platform_driver anarion_dwmac_driver = {
126	.probe  = anarion_dwmac_probe,
127	.driver = {
128		.name           = "anarion-dwmac",
129		.pm		= &stmmac_pltfr_pm_ops,
130		.of_match_table = anarion_dwmac_match,
131	},
132};
133module_platform_driver(anarion_dwmac_driver);
134
135MODULE_DESCRIPTION("Adaptrum Anarion DWMAC specific glue layer");
136MODULE_AUTHOR("Alexandru Gagniuc <mr.nuke.me@gmail.com>");
137MODULE_LICENSE("GPL v2");