2 * Oxford Semiconductor OXNAS DWMAC glue layer
4 * Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com>
5 * Copyright (C) 2014 Daniel Golle <daniel@makrotopia.org>
6 * Copyright (C) 2013 Ma Haijun <mahaijuns@gmail.com>
7 * Copyright (C) 2012 John Crispin <blogic@openwrt.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 #include <linux/device.h>
19 #include <linux/module.h>
21 #include <linux/platform_device.h>
22 #include <linux/regmap.h>
23 #include <linux/mfd/syscon.h>
24 #include <linux/stmmac.h>
26 #include "stmmac_platform.h"
28 /* System Control regmap offsets */
29 #define OXNAS_DWMAC_CTRL_REGOFFSET 0x78
30 #define OXNAS_DWMAC_DELAY_REGOFFSET 0x100
32 /* Control Register */
33 #define DWMAC_CKEN_RX_IN 14
34 #define DWMAC_CKEN_RXN_OUT 13
35 #define DWMAC_CKEN_RX_OUT 12
36 #define DWMAC_CKEN_TX_IN 10
37 #define DWMAC_CKEN_TXN_OUT 9
38 #define DWMAC_CKEN_TX_OUT 8
39 #define DWMAC_RX_SOURCE 7
40 #define DWMAC_TX_SOURCE 6
41 #define DWMAC_LOW_TX_SOURCE 4
42 #define DWMAC_AUTO_TX_SOURCE 3
44 #define DWMAC_SIMPLE_MUX 1
45 #define DWMAC_CKEN_GTX 0
48 #define DWMAC_TX_VARDELAY_SHIFT 0
49 #define DWMAC_TXN_VARDELAY_SHIFT 8
50 #define DWMAC_RX_VARDELAY_SHIFT 16
51 #define DWMAC_RXN_VARDELAY_SHIFT 24
52 #define DWMAC_TX_VARDELAY(d) ((d) << DWMAC_TX_VARDELAY_SHIFT)
53 #define DWMAC_TXN_VARDELAY(d) ((d) << DWMAC_TXN_VARDELAY_SHIFT)
54 #define DWMAC_RX_VARDELAY(d) ((d) << DWMAC_RX_VARDELAY_SHIFT)
55 #define DWMAC_RXN_VARDELAY(d) ((d) << DWMAC_RXN_VARDELAY_SHIFT)
60 struct regmap *regmap;
63 static int oxnas_dwmac_init(struct oxnas_dwmac *dwmac)
68 /* Reset HW here before changing the glue configuration */
69 ret = device_reset(dwmac->dev);
73 ret = clk_prepare_enable(dwmac->clk);
77 ret = regmap_read(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, &value);
79 clk_disable_unprepare(dwmac->clk);
83 /* Enable GMII_GTXCLK to follow GMII_REFCLK, required for gigabit PHY */
84 value |= BIT(DWMAC_CKEN_GTX) |
85 /* Use simple mux for 25/125 Mhz clock switching */
86 BIT(DWMAC_SIMPLE_MUX) |
87 /* set auto switch tx clock source */
88 BIT(DWMAC_AUTO_TX_SOURCE) |
89 /* enable tx & rx vardelay */
90 BIT(DWMAC_CKEN_TX_OUT) |
91 BIT(DWMAC_CKEN_TXN_OUT) |
92 BIT(DWMAC_CKEN_TX_IN) |
93 BIT(DWMAC_CKEN_RX_OUT) |
94 BIT(DWMAC_CKEN_RXN_OUT) |
95 BIT(DWMAC_CKEN_RX_IN);
96 regmap_write(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, value);
98 /* set tx & rx vardelay */
99 value = DWMAC_TX_VARDELAY(4) |
100 DWMAC_TXN_VARDELAY(2) |
101 DWMAC_RX_VARDELAY(10) |
102 DWMAC_RXN_VARDELAY(8);
103 regmap_write(dwmac->regmap, OXNAS_DWMAC_DELAY_REGOFFSET, value);
108 static int oxnas_dwmac_probe(struct platform_device *pdev)
110 struct plat_stmmacenet_data *plat_dat;
111 struct stmmac_resources stmmac_res;
112 struct device_node *sysctrl;
113 struct oxnas_dwmac *dwmac;
116 sysctrl = of_parse_phandle(pdev->dev.of_node, "oxsemi,sys-ctrl", 0);
118 dev_err(&pdev->dev, "failed to get sys-ctrl node\n");
122 ret = stmmac_get_platform_resources(pdev, &stmmac_res);
126 plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
127 if (IS_ERR(plat_dat))
128 return PTR_ERR(plat_dat);
130 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
134 dwmac->dev = &pdev->dev;
135 plat_dat->bsp_priv = dwmac;
137 dwmac->regmap = syscon_node_to_regmap(sysctrl);
138 if (IS_ERR(dwmac->regmap)) {
139 dev_err(&pdev->dev, "failed to have sysctrl regmap\n");
140 return PTR_ERR(dwmac->regmap);
143 dwmac->clk = devm_clk_get(&pdev->dev, "gmac");
144 if (IS_ERR(dwmac->clk))
145 return PTR_ERR(dwmac->clk);
147 ret = oxnas_dwmac_init(dwmac);
151 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
153 clk_disable_unprepare(dwmac->clk);
158 static int oxnas_dwmac_remove(struct platform_device *pdev)
160 struct oxnas_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
161 int ret = stmmac_dvr_remove(&pdev->dev);
163 clk_disable_unprepare(dwmac->clk);
168 #ifdef CONFIG_PM_SLEEP
169 static int oxnas_dwmac_suspend(struct device *dev)
171 struct oxnas_dwmac *dwmac = get_stmmac_bsp_priv(dev);
174 ret = stmmac_suspend(dev);
175 clk_disable_unprepare(dwmac->clk);
180 static int oxnas_dwmac_resume(struct device *dev)
182 struct oxnas_dwmac *dwmac = get_stmmac_bsp_priv(dev);
185 ret = oxnas_dwmac_init(dwmac);
189 ret = stmmac_resume(dev);
193 #endif /* CONFIG_PM_SLEEP */
195 static SIMPLE_DEV_PM_OPS(oxnas_dwmac_pm_ops,
196 oxnas_dwmac_suspend, oxnas_dwmac_resume);
198 static const struct of_device_id oxnas_dwmac_match[] = {
199 { .compatible = "oxsemi,ox820-dwmac" },
202 MODULE_DEVICE_TABLE(of, oxnas_dwmac_match);
204 static struct platform_driver oxnas_dwmac_driver = {
205 .probe = oxnas_dwmac_probe,
206 .remove = oxnas_dwmac_remove,
208 .name = "oxnas-dwmac",
209 .pm = &oxnas_dwmac_pm_ops,
210 .of_match_table = oxnas_dwmac_match,
213 module_platform_driver(oxnas_dwmac_driver);
215 MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
216 MODULE_DESCRIPTION("Oxford Semiconductor OXNAS DWMAC glue layer");
217 MODULE_LICENSE("GPL v2");