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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");
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 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 dev_err(&pdev->dev, "Cannot get reset region (%ld)!\n",
72 PTR_ERR(ctl_block));
73 return 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 = (uintptr_t)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 = 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 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
128 if (ret) {
129 stmmac_remove_config_dt(pdev, plat_dat);
130 return ret;
131 }
132
133 return 0;
134}
135
136static const struct of_device_id anarion_dwmac_match[] = {
137 { .compatible = "adaptrum,anarion-gmac" },
138 { }
139};
140MODULE_DEVICE_TABLE(of, anarion_dwmac_match);
141
142static struct platform_driver anarion_dwmac_driver = {
143 .probe = anarion_dwmac_probe,
144 .remove = stmmac_pltfr_remove,
145 .driver = {
146 .name = "anarion-dwmac",
147 .pm = &stmmac_pltfr_pm_ops,
148 .of_match_table = anarion_dwmac_match,
149 },
150};
151module_platform_driver(anarion_dwmac_driver);
152
153MODULE_DESCRIPTION("Adaptrum Anarion DWMAC specific glue layer");
154MODULE_AUTHOR("Alexandru Gagniuc <mr.nuke.me@gmail.com>");
155MODULE_LICENSE("GPL v2");