1 /**
2 * dwmac-rk.c - Rockchip RK3288 DWMAC specific glue layer
3 *
4 * Copyright (C) 2014 Chen-Zhi (Roger Chen)
5 *
6 * Chen-Zhi (Roger Chen) <roger.chen@rock-chips.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18
19 #include <linux/stmmac.h>
20 #include <linux/bitops.h>
21 #include <linux/clk.h>
22 #include <linux/phy.h>
23 #include <linux/of_net.h>
24 #include <linux/gpio.h>
25 #include <linux/of_gpio.h>
26 #include <linux/of_device.h>
27 #include <linux/regulator/consumer.h>
28 #include <linux/delay.h>
29 #include <linux/mfd/syscon.h>
30 #include <linux/regmap.h>
31
32 struct rk_priv_data {
33 struct platform_device *pdev;
34 int phy_iface;
35 struct regulator *regulator;
36
37 bool clk_enabled;
38 bool clock_input;
39
40 struct clk *clk_mac;
41 struct clk *gmac_clkin;
42 struct clk *mac_clk_rx;
43 struct clk *mac_clk_tx;
44 struct clk *clk_mac_ref;
45 struct clk *clk_mac_refout;
46 struct clk *aclk_mac;
47 struct clk *pclk_mac;
48
49 int tx_delay;
50 int rx_delay;
51
52 struct regmap *grf;
53 };
54
55 #define HIWORD_UPDATE(val, mask, shift) \
56 ((val) << (shift) | (mask) << ((shift) + 16))
57
58 #define GRF_BIT(nr) (BIT(nr) | BIT(nr+16))
59 #define GRF_CLR_BIT(nr) (BIT(nr+16))
60
61 #define RK3288_GRF_SOC_CON1 0x0248
62 #define RK3288_GRF_SOC_CON3 0x0250
63 #define RK3288_GRF_GPIO3D_E 0x01ec
64 #define RK3288_GRF_GPIO4A_E 0x01f0
65 #define RK3288_GRF_GPIO4B_E 0x01f4
66
67 /*RK3288_GRF_SOC_CON1*/
68 #define GMAC_PHY_INTF_SEL_RGMII (GRF_BIT(6) | GRF_CLR_BIT(7) | GRF_CLR_BIT(8))
69 #define GMAC_PHY_INTF_SEL_RMII (GRF_CLR_BIT(6) | GRF_CLR_BIT(7) | GRF_BIT(8))
70 #define GMAC_FLOW_CTRL GRF_BIT(9)
71 #define GMAC_FLOW_CTRL_CLR GRF_CLR_BIT(9)
72 #define GMAC_SPEED_10M GRF_CLR_BIT(10)
73 #define GMAC_SPEED_100M GRF_BIT(10)
74 #define GMAC_RMII_CLK_25M GRF_BIT(11)
75 #define GMAC_RMII_CLK_2_5M GRF_CLR_BIT(11)
76 #define GMAC_CLK_125M (GRF_CLR_BIT(12) | GRF_CLR_BIT(13))
77 #define GMAC_CLK_25M (GRF_BIT(12) | GRF_BIT(13))
78 #define GMAC_CLK_2_5M (GRF_CLR_BIT(12) | GRF_BIT(13))
79 #define GMAC_RMII_MODE GRF_BIT(14)
80 #define GMAC_RMII_MODE_CLR GRF_CLR_BIT(14)
81
82 /*RK3288_GRF_SOC_CON3*/
83 #define GMAC_TXCLK_DLY_ENABLE GRF_BIT(14)
84 #define GMAC_TXCLK_DLY_DISABLE GRF_CLR_BIT(14)
85 #define GMAC_RXCLK_DLY_ENABLE GRF_BIT(15)
86 #define GMAC_RXCLK_DLY_DISABLE GRF_CLR_BIT(15)
87 #define GMAC_CLK_RX_DL_CFG(val) HIWORD_UPDATE(val, 0x7F, 7)
88 #define GMAC_CLK_TX_DL_CFG(val) HIWORD_UPDATE(val, 0x7F, 0)
89
set_to_rgmii(struct rk_priv_data * bsp_priv,int tx_delay,int rx_delay)90 static void set_to_rgmii(struct rk_priv_data *bsp_priv,
91 int tx_delay, int rx_delay)
92 {
93 struct device *dev = &bsp_priv->pdev->dev;
94
95 if (IS_ERR(bsp_priv->grf)) {
96 dev_err(dev, "%s: Missing rockchip,grf property\n", __func__);
97 return;
98 }
99
100 regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
101 GMAC_PHY_INTF_SEL_RGMII | GMAC_RMII_MODE_CLR);
102 regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON3,
103 GMAC_RXCLK_DLY_ENABLE | GMAC_TXCLK_DLY_ENABLE |
104 GMAC_CLK_RX_DL_CFG(rx_delay) |
105 GMAC_CLK_TX_DL_CFG(tx_delay));
106 }
107
set_to_rmii(struct rk_priv_data * bsp_priv)108 static void set_to_rmii(struct rk_priv_data *bsp_priv)
109 {
110 struct device *dev = &bsp_priv->pdev->dev;
111
112 if (IS_ERR(bsp_priv->grf)) {
113 dev_err(dev, "%s: Missing rockchip,grf property\n", __func__);
114 return;
115 }
116
117 regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
118 GMAC_PHY_INTF_SEL_RMII | GMAC_RMII_MODE);
119 }
120
set_rgmii_speed(struct rk_priv_data * bsp_priv,int speed)121 static void set_rgmii_speed(struct rk_priv_data *bsp_priv, int speed)
122 {
123 struct device *dev = &bsp_priv->pdev->dev;
124
125 if (IS_ERR(bsp_priv->grf)) {
126 dev_err(dev, "%s: Missing rockchip,grf property\n", __func__);
127 return;
128 }
129
130 if (speed == 10)
131 regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1, GMAC_CLK_2_5M);
132 else if (speed == 100)
133 regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1, GMAC_CLK_25M);
134 else if (speed == 1000)
135 regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1, GMAC_CLK_125M);
136 else
137 dev_err(dev, "unknown speed value for RGMII! speed=%d", speed);
138 }
139
set_rmii_speed(struct rk_priv_data * bsp_priv,int speed)140 static void set_rmii_speed(struct rk_priv_data *bsp_priv, int speed)
141 {
142 struct device *dev = &bsp_priv->pdev->dev;
143
144 if (IS_ERR(bsp_priv->grf)) {
145 dev_err(dev, "%s: Missing rockchip,grf property\n", __func__);
146 return;
147 }
148
149 if (speed == 10) {
150 regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
151 GMAC_RMII_CLK_2_5M | GMAC_SPEED_10M);
152 } else if (speed == 100) {
153 regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
154 GMAC_RMII_CLK_25M | GMAC_SPEED_100M);
155 } else {
156 dev_err(dev, "unknown speed value for RMII! speed=%d", speed);
157 }
158 }
159
gmac_clk_init(struct rk_priv_data * bsp_priv)160 static int gmac_clk_init(struct rk_priv_data *bsp_priv)
161 {
162 struct device *dev = &bsp_priv->pdev->dev;
163
164 bsp_priv->clk_enabled = false;
165
166 bsp_priv->mac_clk_rx = devm_clk_get(dev, "mac_clk_rx");
167 if (IS_ERR(bsp_priv->mac_clk_rx))
168 dev_err(dev, "%s: cannot get clock %s\n",
169 __func__, "mac_clk_rx");
170
171 bsp_priv->mac_clk_tx = devm_clk_get(dev, "mac_clk_tx");
172 if (IS_ERR(bsp_priv->mac_clk_tx))
173 dev_err(dev, "%s: cannot get clock %s\n",
174 __func__, "mac_clk_tx");
175
176 bsp_priv->aclk_mac = devm_clk_get(dev, "aclk_mac");
177 if (IS_ERR(bsp_priv->aclk_mac))
178 dev_err(dev, "%s: cannot get clock %s\n",
179 __func__, "aclk_mac");
180
181 bsp_priv->pclk_mac = devm_clk_get(dev, "pclk_mac");
182 if (IS_ERR(bsp_priv->pclk_mac))
183 dev_err(dev, "%s: cannot get clock %s\n",
184 __func__, "pclk_mac");
185
186 bsp_priv->clk_mac = devm_clk_get(dev, "stmmaceth");
187 if (IS_ERR(bsp_priv->clk_mac))
188 dev_err(dev, "%s: cannot get clock %s\n",
189 __func__, "stmmaceth");
190
191 if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII) {
192 bsp_priv->clk_mac_ref = devm_clk_get(dev, "clk_mac_ref");
193 if (IS_ERR(bsp_priv->clk_mac_ref))
194 dev_err(dev, "%s: cannot get clock %s\n",
195 __func__, "clk_mac_ref");
196
197 if (!bsp_priv->clock_input) {
198 bsp_priv->clk_mac_refout =
199 devm_clk_get(dev, "clk_mac_refout");
200 if (IS_ERR(bsp_priv->clk_mac_refout))
201 dev_err(dev, "%s: cannot get clock %s\n",
202 __func__, "clk_mac_refout");
203 }
204 }
205
206 if (bsp_priv->clock_input) {
207 dev_info(dev, "%s: clock input from PHY\n", __func__);
208 } else {
209 if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII)
210 clk_set_rate(bsp_priv->clk_mac, 50000000);
211 }
212
213 return 0;
214 }
215
gmac_clk_enable(struct rk_priv_data * bsp_priv,bool enable)216 static int gmac_clk_enable(struct rk_priv_data *bsp_priv, bool enable)
217 {
218 int phy_iface = phy_iface = bsp_priv->phy_iface;
219
220 if (enable) {
221 if (!bsp_priv->clk_enabled) {
222 if (phy_iface == PHY_INTERFACE_MODE_RMII) {
223 if (!IS_ERR(bsp_priv->mac_clk_rx))
224 clk_prepare_enable(
225 bsp_priv->mac_clk_rx);
226
227 if (!IS_ERR(bsp_priv->clk_mac_ref))
228 clk_prepare_enable(
229 bsp_priv->clk_mac_ref);
230
231 if (!IS_ERR(bsp_priv->clk_mac_refout))
232 clk_prepare_enable(
233 bsp_priv->clk_mac_refout);
234 }
235
236 if (!IS_ERR(bsp_priv->aclk_mac))
237 clk_prepare_enable(bsp_priv->aclk_mac);
238
239 if (!IS_ERR(bsp_priv->pclk_mac))
240 clk_prepare_enable(bsp_priv->pclk_mac);
241
242 if (!IS_ERR(bsp_priv->mac_clk_tx))
243 clk_prepare_enable(bsp_priv->mac_clk_tx);
244
245 /**
246 * if (!IS_ERR(bsp_priv->clk_mac))
247 * clk_prepare_enable(bsp_priv->clk_mac);
248 */
249 mdelay(5);
250 bsp_priv->clk_enabled = true;
251 }
252 } else {
253 if (bsp_priv->clk_enabled) {
254 if (phy_iface == PHY_INTERFACE_MODE_RMII) {
255 if (!IS_ERR(bsp_priv->mac_clk_rx))
256 clk_disable_unprepare(
257 bsp_priv->mac_clk_rx);
258
259 if (!IS_ERR(bsp_priv->clk_mac_ref))
260 clk_disable_unprepare(
261 bsp_priv->clk_mac_ref);
262
263 if (!IS_ERR(bsp_priv->clk_mac_refout))
264 clk_disable_unprepare(
265 bsp_priv->clk_mac_refout);
266 }
267
268 if (!IS_ERR(bsp_priv->aclk_mac))
269 clk_disable_unprepare(bsp_priv->aclk_mac);
270
271 if (!IS_ERR(bsp_priv->pclk_mac))
272 clk_disable_unprepare(bsp_priv->pclk_mac);
273
274 if (!IS_ERR(bsp_priv->mac_clk_tx))
275 clk_disable_unprepare(bsp_priv->mac_clk_tx);
276 /**
277 * if (!IS_ERR(bsp_priv->clk_mac))
278 * clk_disable_unprepare(bsp_priv->clk_mac);
279 */
280 bsp_priv->clk_enabled = false;
281 }
282 }
283
284 return 0;
285 }
286
phy_power_on(struct rk_priv_data * bsp_priv,bool enable)287 static int phy_power_on(struct rk_priv_data *bsp_priv, bool enable)
288 {
289 struct regulator *ldo = bsp_priv->regulator;
290 int ret;
291 struct device *dev = &bsp_priv->pdev->dev;
292
293 if (!ldo) {
294 dev_err(dev, "%s: no regulator found\n", __func__);
295 return -1;
296 }
297
298 if (enable) {
299 ret = regulator_enable(ldo);
300 if (ret)
301 dev_err(dev, "%s: fail to enable phy-supply\n",
302 __func__);
303 } else {
304 ret = regulator_disable(ldo);
305 if (ret)
306 dev_err(dev, "%s: fail to disable phy-supply\n",
307 __func__);
308 }
309
310 return 0;
311 }
312
rk_gmac_setup(struct platform_device * pdev)313 static void *rk_gmac_setup(struct platform_device *pdev)
314 {
315 struct rk_priv_data *bsp_priv;
316 struct device *dev = &pdev->dev;
317 int ret;
318 const char *strings = NULL;
319 int value;
320
321 bsp_priv = devm_kzalloc(dev, sizeof(*bsp_priv), GFP_KERNEL);
322 if (!bsp_priv)
323 return ERR_PTR(-ENOMEM);
324
325 bsp_priv->phy_iface = of_get_phy_mode(dev->of_node);
326
327 bsp_priv->regulator = devm_regulator_get_optional(dev, "phy");
328 if (IS_ERR(bsp_priv->regulator)) {
329 if (PTR_ERR(bsp_priv->regulator) == -EPROBE_DEFER) {
330 dev_err(dev, "phy regulator is not available yet, deferred probing\n");
331 return ERR_PTR(-EPROBE_DEFER);
332 }
333 dev_err(dev, "no regulator found\n");
334 bsp_priv->regulator = NULL;
335 }
336
337 ret = of_property_read_string(dev->of_node, "clock_in_out", &strings);
338 if (ret) {
339 dev_err(dev, "%s: Can not read property: clock_in_out.\n",
340 __func__);
341 bsp_priv->clock_input = true;
342 } else {
343 dev_info(dev, "%s: clock input or output? (%s).\n",
344 __func__, strings);
345 if (!strcmp(strings, "input"))
346 bsp_priv->clock_input = true;
347 else
348 bsp_priv->clock_input = false;
349 }
350
351 ret = of_property_read_u32(dev->of_node, "tx_delay", &value);
352 if (ret) {
353 bsp_priv->tx_delay = 0x30;
354 dev_err(dev, "%s: Can not read property: tx_delay.", __func__);
355 dev_err(dev, "%s: set tx_delay to 0x%x\n",
356 __func__, bsp_priv->tx_delay);
357 } else {
358 dev_info(dev, "%s: TX delay(0x%x).\n", __func__, value);
359 bsp_priv->tx_delay = value;
360 }
361
362 ret = of_property_read_u32(dev->of_node, "rx_delay", &value);
363 if (ret) {
364 bsp_priv->rx_delay = 0x10;
365 dev_err(dev, "%s: Can not read property: rx_delay.", __func__);
366 dev_err(dev, "%s: set rx_delay to 0x%x\n",
367 __func__, bsp_priv->rx_delay);
368 } else {
369 dev_info(dev, "%s: RX delay(0x%x).\n", __func__, value);
370 bsp_priv->rx_delay = value;
371 }
372
373 bsp_priv->grf = syscon_regmap_lookup_by_phandle(dev->of_node,
374 "rockchip,grf");
375 bsp_priv->pdev = pdev;
376
377 /*rmii or rgmii*/
378 if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RGMII) {
379 dev_info(dev, "%s: init for RGMII\n", __func__);
380 set_to_rgmii(bsp_priv, bsp_priv->tx_delay, bsp_priv->rx_delay);
381 } else if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII) {
382 dev_info(dev, "%s: init for RMII\n", __func__);
383 set_to_rmii(bsp_priv);
384 } else {
385 dev_err(dev, "%s: NO interface defined!\n", __func__);
386 }
387
388 gmac_clk_init(bsp_priv);
389
390 return bsp_priv;
391 }
392
rk_gmac_init(struct platform_device * pdev,void * priv)393 static int rk_gmac_init(struct platform_device *pdev, void *priv)
394 {
395 struct rk_priv_data *bsp_priv = priv;
396 int ret;
397
398 ret = phy_power_on(bsp_priv, true);
399 if (ret)
400 return ret;
401
402 ret = gmac_clk_enable(bsp_priv, true);
403 if (ret)
404 return ret;
405
406 return 0;
407 }
408
rk_gmac_exit(struct platform_device * pdev,void * priv)409 static void rk_gmac_exit(struct platform_device *pdev, void *priv)
410 {
411 struct rk_priv_data *gmac = priv;
412
413 phy_power_on(gmac, false);
414 gmac_clk_enable(gmac, false);
415 }
416
rk_fix_speed(void * priv,unsigned int speed)417 static void rk_fix_speed(void *priv, unsigned int speed)
418 {
419 struct rk_priv_data *bsp_priv = priv;
420 struct device *dev = &bsp_priv->pdev->dev;
421
422 if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RGMII)
423 set_rgmii_speed(bsp_priv, speed);
424 else if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII)
425 set_rmii_speed(bsp_priv, speed);
426 else
427 dev_err(dev, "unsupported interface %d", bsp_priv->phy_iface);
428 }
429
430 const struct stmmac_of_data rk3288_gmac_data = {
431 .has_gmac = 1,
432 .fix_mac_speed = rk_fix_speed,
433 .setup = rk_gmac_setup,
434 .init = rk_gmac_init,
435 .exit = rk_gmac_exit,
436 };
437