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 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	struct anarion_gmac *gmac;
65	phy_interface_t phy_mode;
66	void __iomem *ctl_block;
67	int err;
68
69	ctl_block = devm_platform_ioremap_resource(pdev, 1);
70	if (IS_ERR(ctl_block)) {
71		err = PTR_ERR(ctl_block);
72		dev_err(&pdev->dev, "Cannot get reset region (%d)!\n", err);
73		return ERR_PTR(err);
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	err = of_get_phy_mode(pdev->dev.of_node, &phy_mode);
83	if (err)
84		return ERR_PTR(err);
85
86	switch (phy_mode) {
87	case PHY_INTERFACE_MODE_RGMII:
88		fallthrough;
89	case PHY_INTERFACE_MODE_RGMII_ID:
90	case PHY_INTERFACE_MODE_RGMII_RXID:
91	case PHY_INTERFACE_MODE_RGMII_TXID:
92		gmac->phy_intf_sel = GMAC_CONFIG_INTF_RGMII;
93		break;
94	default:
95		dev_err(&pdev->dev, "Unsupported phy-mode (%d)\n",
96			phy_mode);
97		return ERR_PTR(-ENOTSUPP);
98	}
99
100	return gmac;
101}
102
103static int anarion_dwmac_probe(struct platform_device *pdev)
104{
105	int ret;
106	struct anarion_gmac *gmac;
107	struct plat_stmmacenet_data *plat_dat;
108	struct stmmac_resources stmmac_res;
109
110	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
111	if (ret)
112		return ret;
113
114	gmac = anarion_config_dt(pdev);
115	if (IS_ERR(gmac))
116		return PTR_ERR(gmac);
117
118	plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
119	if (IS_ERR(plat_dat))
120		return PTR_ERR(plat_dat);
121
122	plat_dat->init = anarion_gmac_init;
123	plat_dat->exit = anarion_gmac_exit;
124	anarion_gmac_init(pdev, gmac);
125	plat_dat->bsp_priv = gmac;
126
127	return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
128}
129
130static const struct of_device_id anarion_dwmac_match[] = {
131	{ .compatible = "adaptrum,anarion-gmac" },
132	{ }
133};
134MODULE_DEVICE_TABLE(of, anarion_dwmac_match);
135
136static struct platform_driver anarion_dwmac_driver = {
137	.probe  = anarion_dwmac_probe,
138	.remove_new = stmmac_pltfr_remove,
139	.driver = {
140		.name           = "anarion-dwmac",
141		.pm		= &stmmac_pltfr_pm_ops,
142		.of_match_table = anarion_dwmac_match,
143	},
144};
145module_platform_driver(anarion_dwmac_driver);
146
147MODULE_DESCRIPTION("Adaptrum Anarion DWMAC specific glue layer");
148MODULE_AUTHOR("Alexandru Gagniuc <mr.nuke.me@gmail.com>");
149MODULE_LICENSE("GPL v2");
150