summaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/stmicro/stmmac/dwmac-anarion.c
blob: d0d2d0fc5f0a9a78da74c9f4c042b3de631fdd29 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Adaptrum Anarion DWMAC glue layer
 *
 * Copyright (C) 2017, Adaptrum, Inc.
 * (Written by Alexandru Gagniuc <alex.g at adaptrum.com> for Adaptrum, Inc.)
 */

#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_net.h>
#include <linux/stmmac.h>

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

#define GMAC_RESET_CONTROL_REG		0
#define GMAC_SW_CONFIG_REG		4
#define  GMAC_CONFIG_INTF_SEL_MASK	(0x7 << 0)
#define  GMAC_CONFIG_INTF_RGMII		(0x1 << 0)

struct anarion_gmac {
	uintptr_t ctl_block;
	uint32_t phy_intf_sel;
};

static uint32_t gmac_read_reg(struct anarion_gmac *gmac, uint8_t reg)
{
	return readl((void *)(gmac->ctl_block + reg));
};

static void gmac_write_reg(struct anarion_gmac *gmac, uint8_t reg, uint32_t val)
{
	writel(val, (void *)(gmac->ctl_block + reg));
}

static int anarion_gmac_init(struct platform_device *pdev, void *priv)
{
	uint32_t sw_config;
	struct anarion_gmac *gmac = priv;

	/* Reset logic, configure interface mode, then release reset. SIMPLE! */
	gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 1);

	sw_config = gmac_read_reg(gmac, GMAC_SW_CONFIG_REG);
	sw_config &= ~GMAC_CONFIG_INTF_SEL_MASK;
	sw_config |= (gmac->phy_intf_sel & GMAC_CONFIG_INTF_SEL_MASK);
	gmac_write_reg(gmac, GMAC_SW_CONFIG_REG, sw_config);

	gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 0);

	return 0;
}

static void anarion_gmac_exit(struct platform_device *pdev, void *priv)
{
	struct anarion_gmac *gmac = priv;

	gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 1);
}

static struct anarion_gmac *anarion_config_dt(struct platform_device *pdev)
{
	struct anarion_gmac *gmac;
	phy_interface_t phy_mode;
	void __iomem *ctl_block;
	int err;

	ctl_block = devm_platform_ioremap_resource(pdev, 1);
	if (IS_ERR(ctl_block)) {
		dev_err(&pdev->dev, "Cannot get reset region (%ld)!\n",
			PTR_ERR(ctl_block));
		return ctl_block;
	}

	gmac = devm_kzalloc(&pdev->dev, sizeof(*gmac), GFP_KERNEL);
	if (!gmac)
		return ERR_PTR(-ENOMEM);

	gmac->ctl_block = (uintptr_t)ctl_block;

	err = of_get_phy_mode(pdev->dev.of_node, &phy_mode);
	if (err)
		return ERR_PTR(err);

	switch (phy_mode) {
	case PHY_INTERFACE_MODE_RGMII:		/* Fall through */
	case PHY_INTERFACE_MODE_RGMII_ID	/* Fall through */:
	case PHY_INTERFACE_MODE_RGMII_RXID:	/* Fall through */
	case PHY_INTERFACE_MODE_RGMII_TXID:
		gmac->phy_intf_sel = GMAC_CONFIG_INTF_RGMII;
		break;
	default:
		dev_err(&pdev->dev, "Unsupported phy-mode (%d)\n",
			phy_mode);
		return ERR_PTR(-ENOTSUPP);
	}

	return gmac;
}

static int anarion_dwmac_probe(struct platform_device *pdev)
{
	int ret;
	struct anarion_gmac *gmac;
	struct plat_stmmacenet_data *plat_dat;
	struct stmmac_resources stmmac_res;

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

	gmac = anarion_config_dt(pdev);
	if (IS_ERR(gmac))
		return PTR_ERR(gmac);

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

	plat_dat->init = anarion_gmac_init;
	plat_dat->exit = anarion_gmac_exit;
	anarion_gmac_init(pdev, gmac);
	plat_dat->bsp_priv = gmac;

	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
	if (ret) {
		stmmac_remove_config_dt(pdev, plat_dat);
		return ret;
	}

	return 0;
}

static const struct of_device_id anarion_dwmac_match[] = {
	{ .compatible = "adaptrum,anarion-gmac" },
	{ }
};
MODULE_DEVICE_TABLE(of, anarion_dwmac_match);

static struct platform_driver anarion_dwmac_driver = {
	.probe  = anarion_dwmac_probe,
	.remove = stmmac_pltfr_remove,
	.driver = {
		.name           = "anarion-dwmac",
		.pm		= &stmmac_pltfr_pm_ops,
		.of_match_table = anarion_dwmac_match,
	},
};
module_platform_driver(anarion_dwmac_driver);

MODULE_DESCRIPTION("Adaptrum Anarion DWMAC specific glue layer");
MODULE_AUTHOR("Alexandru Gagniuc <mr.nuke.me@gmail.com>");
MODULE_LICENSE("GPL v2");