ramips: rename ethernet driver folder to the same one that upstream uses
[openwrt/openwrt.git] / target / linux / ramips / files-4.14 / drivers / net / ethernet / mediatek / gsw_mt7621.c
1 /* This program is free software; you can redistribute it and/or modify
2 * it under the terms of the GNU General Public License as published by
3 * the Free Software Foundation; version 2 of the License
4 *
5 * This program is distributed in the hope that it will be useful,
6 * but WITHOUT ANY WARRANTY; without even the implied warranty of
7 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
8 * GNU General Public License for more details.
9 *
10 * Copyright (C) 2009-2015 John Crispin <blogic@openwrt.org>
11 * Copyright (C) 2009-2015 Felix Fietkau <nbd@nbd.name>
12 * Copyright (C) 2013-2015 Michael Lee <igvtee@gmail.com>
13 */
14
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/platform_device.h>
19 #include <linux/of_device.h>
20 #include <linux/of_irq.h>
21
22 #include <ralink_regs.h>
23
24 #include "mtk_eth_soc.h"
25 #include "gsw_mt7620.h"
26
27 void mtk_switch_w32(struct mt7620_gsw *gsw, u32 val, unsigned reg)
28 {
29 iowrite32(val, gsw->base + reg);
30 }
31
32 u32 mtk_switch_r32(struct mt7620_gsw *gsw, unsigned reg)
33 {
34 return ioread32(gsw->base + reg);
35 }
36
37 static irqreturn_t gsw_interrupt_mt7621(int irq, void *_priv)
38 {
39 struct fe_priv *priv = (struct fe_priv *)_priv;
40 struct mt7620_gsw *gsw = (struct mt7620_gsw *)priv->soc->swpriv;
41 u32 reg, i;
42
43 reg = mt7530_mdio_r32(gsw, 0x700c);
44 mt7530_mdio_w32(gsw, 0x700c, reg);
45
46 for (i = 0; i < 5; i++)
47 if (reg & BIT(i)) {
48 unsigned int link;
49
50 link = mt7530_mdio_r32(gsw,
51 0x3008 + (i * 0x100)) & 0x1;
52
53 if (link != priv->link[i]) {
54 priv->link[i] = link;
55 if (link)
56 netdev_info(priv->netdev,
57 "port %d link up\n", i);
58 else
59 netdev_info(priv->netdev,
60 "port %d link down\n", i);
61 }
62 }
63
64 mt7620_handle_carrier(priv);
65
66 return IRQ_HANDLED;
67 }
68
69 static void mt7621_hw_init(struct mt7620_gsw *gsw, struct device_node *np)
70 {
71 u32 i;
72 u32 val;
73
74 /* wardware reset the switch */
75 fe_reset(RST_CTRL_MCM);
76 mdelay(10);
77
78 /* reduce RGMII2 PAD driving strength */
79 rt_sysc_m32(3 << 4, 0, SYSC_PAD_RGMII2_MDIO);
80
81 /* gpio mux - RGMII1=Normal mode */
82 rt_sysc_m32(BIT(14), 0, SYSC_GPIO_MODE);
83
84 /* set GMAC1 RGMII mode */
85 rt_sysc_m32(3 << 12, 0, SYSC_REG_CFG1);
86
87 /* enable MDIO to control MT7530 */
88 rt_sysc_m32(3 << 12, 0, SYSC_GPIO_MODE);
89
90 /* turn off all PHYs */
91 for (i = 0; i <= 4; i++) {
92 val = _mt7620_mii_read(gsw, i, 0x0);
93 val |= BIT(11);
94 _mt7620_mii_write(gsw, i, 0x0, val);
95 }
96
97 /* reset the switch */
98 mt7530_mdio_w32(gsw, 0x7000, 0x3);
99 usleep_range(10, 20);
100
101 if ((rt_sysc_r32(SYSC_REG_CHIP_REV_ID) & 0xFFFF) == 0x0101) {
102 /* (GE1, Force 1000M/FD, FC ON, MAX_RX_LENGTH 1536) */
103 mtk_switch_w32(gsw, 0x2305e30b, GSW_REG_MAC_P0_MCR);
104 mt7530_mdio_w32(gsw, 0x3600, 0x5e30b);
105 } else {
106 /* (GE1, Force 1000M/FD, FC ON, MAX_RX_LENGTH 1536) */
107 mtk_switch_w32(gsw, 0x2305e33b, GSW_REG_MAC_P0_MCR);
108 mt7530_mdio_w32(gsw, 0x3600, 0x5e33b);
109 }
110
111 /* (GE2, Link down) */
112 mtk_switch_w32(gsw, 0x8000, GSW_REG_MAC_P1_MCR);
113
114 /* Set switch max RX frame length to 2k */
115 mt7530_mdio_w32(gsw, GSW_REG_GMACCR, 0x3F0B);
116
117 /* Enable Port 6, P5 as GMAC5, P5 disable */
118 val = mt7530_mdio_r32(gsw, 0x7804);
119 val &= ~BIT(8);
120 val |= BIT(6) | BIT(13) | BIT(16);
121 mt7530_mdio_w32(gsw, 0x7804, val);
122
123 val = rt_sysc_r32(0x10);
124 val = (val >> 6) & 0x7;
125 if (val >= 6) {
126 /* 25Mhz Xtal - do nothing */
127 } else if (val >= 3) {
128 /* 40Mhz */
129
130 /* disable MT7530 core clock */
131 _mt7620_mii_write(gsw, 0, 13, 0x1f);
132 _mt7620_mii_write(gsw, 0, 14, 0x410);
133 _mt7620_mii_write(gsw, 0, 13, 0x401f);
134 _mt7620_mii_write(gsw, 0, 14, 0x0);
135
136 /* disable MT7530 PLL */
137 _mt7620_mii_write(gsw, 0, 13, 0x1f);
138 _mt7620_mii_write(gsw, 0, 14, 0x40d);
139 _mt7620_mii_write(gsw, 0, 13, 0x401f);
140 _mt7620_mii_write(gsw, 0, 14, 0x2020);
141
142 /* for MT7530 core clock = 500Mhz */
143 _mt7620_mii_write(gsw, 0, 13, 0x1f);
144 _mt7620_mii_write(gsw, 0, 14, 0x40e);
145 _mt7620_mii_write(gsw, 0, 13, 0x401f);
146 _mt7620_mii_write(gsw, 0, 14, 0x119);
147
148 /* enable MT7530 PLL */
149 _mt7620_mii_write(gsw, 0, 13, 0x1f);
150 _mt7620_mii_write(gsw, 0, 14, 0x40d);
151 _mt7620_mii_write(gsw, 0, 13, 0x401f);
152 _mt7620_mii_write(gsw, 0, 14, 0x2820);
153
154 usleep_range(20, 40);
155
156 /* enable MT7530 core clock */
157 _mt7620_mii_write(gsw, 0, 13, 0x1f);
158 _mt7620_mii_write(gsw, 0, 14, 0x410);
159 _mt7620_mii_write(gsw, 0, 13, 0x401f);
160 } else {
161 /* 20Mhz Xtal - TODO */
162 }
163
164 /* RGMII */
165 _mt7620_mii_write(gsw, 0, 14, 0x1);
166
167 /* set MT7530 central align */
168 val = mt7530_mdio_r32(gsw, 0x7830);
169 val &= ~BIT(0);
170 val |= BIT(1);
171 mt7530_mdio_w32(gsw, 0x7830, val);
172 val = mt7530_mdio_r32(gsw, 0x7a40);
173 val &= ~BIT(30);
174 mt7530_mdio_w32(gsw, 0x7a40, val);
175 mt7530_mdio_w32(gsw, 0x7a78, 0x855);
176
177 /* delay setting for 10/1000M */
178 mt7530_mdio_w32(gsw, 0x7b00, 0x102);
179 mt7530_mdio_w32(gsw, 0x7b04, 0x14);
180
181 /* lower Tx Driving*/
182 mt7530_mdio_w32(gsw, 0x7a54, 0x44);
183 mt7530_mdio_w32(gsw, 0x7a5c, 0x44);
184 mt7530_mdio_w32(gsw, 0x7a64, 0x44);
185 mt7530_mdio_w32(gsw, 0x7a6c, 0x44);
186 mt7530_mdio_w32(gsw, 0x7a74, 0x44);
187 mt7530_mdio_w32(gsw, 0x7a7c, 0x44);
188
189 /* turn on all PHYs */
190 for (i = 0; i <= 4; i++) {
191 val = _mt7620_mii_read(gsw, i, 0);
192 val &= ~BIT(11);
193 _mt7620_mii_write(gsw, i, 0, val);
194 }
195
196 /* enable irq */
197 mt7530_mdio_w32(gsw, 0x7008, 0x1f);
198 val = mt7530_mdio_r32(gsw, 0x7808);
199 val |= 3 << 16;
200 mt7530_mdio_w32(gsw, 0x7808, val);
201 }
202
203 static const struct of_device_id mediatek_gsw_match[] = {
204 { .compatible = "mediatek,mt7621-gsw" },
205 {},
206 };
207 MODULE_DEVICE_TABLE(of, mediatek_gsw_match);
208
209 int mtk_gsw_init(struct fe_priv *priv)
210 {
211 struct device_node *np = priv->switch_np;
212 struct platform_device *pdev = of_find_device_by_node(np);
213 struct mt7620_gsw *gsw;
214
215 if (!pdev)
216 return -ENODEV;
217
218 if (!of_device_is_compatible(np, mediatek_gsw_match->compatible))
219 return -EINVAL;
220
221 gsw = platform_get_drvdata(pdev);
222 priv->soc->swpriv = gsw;
223
224 if (gsw->irq) {
225 request_irq(gsw->irq, gsw_interrupt_mt7621, 0,
226 "gsw", priv);
227 disable_irq(gsw->irq);
228 }
229
230 mt7621_hw_init(gsw, np);
231
232 if (gsw->irq)
233 enable_irq(gsw->irq);
234
235 return 0;
236 }
237
238 static int mt7621_gsw_probe(struct platform_device *pdev)
239 {
240 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
241 struct mt7620_gsw *gsw;
242
243 gsw = devm_kzalloc(&pdev->dev, sizeof(struct mt7620_gsw), GFP_KERNEL);
244 if (!gsw)
245 return -ENOMEM;
246
247 gsw->base = devm_ioremap_resource(&pdev->dev, res);
248 if (IS_ERR(gsw->base))
249 return PTR_ERR(gsw->base);
250
251 gsw->dev = &pdev->dev;
252 gsw->irq = platform_get_irq(pdev, 0);
253
254 platform_set_drvdata(pdev, gsw);
255
256 return 0;
257 }
258
259 static int mt7621_gsw_remove(struct platform_device *pdev)
260 {
261 platform_set_drvdata(pdev, NULL);
262
263 return 0;
264 }
265
266 static struct platform_driver gsw_driver = {
267 .probe = mt7621_gsw_probe,
268 .remove = mt7621_gsw_remove,
269 .driver = {
270 .name = "mt7621-gsw",
271 .owner = THIS_MODULE,
272 .of_match_table = mediatek_gsw_match,
273 },
274 };
275
276 module_platform_driver(gsw_driver);
277
278 MODULE_LICENSE("GPL");
279 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
280 MODULE_DESCRIPTION("GBit switch driver for Mediatek MT7621 SoC");
281 MODULE_VERSION(MTK_FE_DRV_VERSION);