1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright 2012-2014 Freescale Semiconductor, Inc.
4 * Copyright (C) 2012 Marek Vasut <marex@denx.de>
5 * on behalf of DENX Software Engineering GmbH
6 */
7
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/platform_device.h>
11 #include <linux/clk.h>
12 #include <linux/usb/otg.h>
13 #include <linux/stmp_device.h>
14 #include <linux/delay.h>
15 #include <linux/err.h>
16 #include <linux/io.h>
17 #include <linux/of.h>
18 #include <linux/regmap.h>
19 #include <linux/mfd/syscon.h>
20 #include <linux/iopoll.h>
21
22 #define DRIVER_NAME "mxs_phy"
23
24 /* Register Macro */
25 #define HW_USBPHY_PWD 0x00
26 #define HW_USBPHY_TX 0x10
27 #define HW_USBPHY_CTRL 0x30
28 #define HW_USBPHY_CTRL_SET 0x34
29 #define HW_USBPHY_CTRL_CLR 0x38
30
31 #define HW_USBPHY_DEBUG_SET 0x54
32 #define HW_USBPHY_DEBUG_CLR 0x58
33
34 #define HW_USBPHY_IP 0x90
35 #define HW_USBPHY_IP_SET 0x94
36 #define HW_USBPHY_IP_CLR 0x98
37
38 #define GM_USBPHY_TX_TXCAL45DP(x) (((x) & 0xf) << 16)
39 #define GM_USBPHY_TX_TXCAL45DN(x) (((x) & 0xf) << 8)
40 #define GM_USBPHY_TX_D_CAL(x) (((x) & 0xf) << 0)
41
42 /* imx7ulp */
43 #define HW_USBPHY_PLL_SIC 0xa0
44 #define HW_USBPHY_PLL_SIC_SET 0xa4
45 #define HW_USBPHY_PLL_SIC_CLR 0xa8
46
47 #define BM_USBPHY_CTRL_SFTRST BIT(31)
48 #define BM_USBPHY_CTRL_CLKGATE BIT(30)
49 #define BM_USBPHY_CTRL_OTG_ID_VALUE BIT(27)
50 #define BM_USBPHY_CTRL_ENAUTOSET_USBCLKS BIT(26)
51 #define BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE BIT(25)
52 #define BM_USBPHY_CTRL_ENVBUSCHG_WKUP BIT(23)
53 #define BM_USBPHY_CTRL_ENIDCHG_WKUP BIT(22)
54 #define BM_USBPHY_CTRL_ENDPDMCHG_WKUP BIT(21)
55 #define BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD BIT(20)
56 #define BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE BIT(19)
57 #define BM_USBPHY_CTRL_ENAUTO_PWRON_PLL BIT(18)
58 #define BM_USBPHY_CTRL_ENUTMILEVEL3 BIT(15)
59 #define BM_USBPHY_CTRL_ENUTMILEVEL2 BIT(14)
60 #define BM_USBPHY_CTRL_ENHOSTDISCONDETECT BIT(1)
61
62 #define BM_USBPHY_IP_FIX (BIT(17) | BIT(18))
63
64 #define BM_USBPHY_DEBUG_CLKGATE BIT(30)
65 /* imx7ulp */
66 #define BM_USBPHY_PLL_LOCK BIT(31)
67 #define BM_USBPHY_PLL_REG_ENABLE BIT(21)
68 #define BM_USBPHY_PLL_BYPASS BIT(16)
69 #define BM_USBPHY_PLL_POWER BIT(12)
70 #define BM_USBPHY_PLL_EN_USB_CLKS BIT(6)
71
72 /* Anatop Registers */
73 #define ANADIG_ANA_MISC0 0x150
74 #define ANADIG_ANA_MISC0_SET 0x154
75 #define ANADIG_ANA_MISC0_CLR 0x158
76
77 #define ANADIG_USB1_CHRG_DETECT_SET 0x1b4
78 #define ANADIG_USB1_CHRG_DETECT_CLR 0x1b8
79 #define ANADIG_USB2_CHRG_DETECT_SET 0x214
80 #define ANADIG_USB1_CHRG_DETECT_EN_B BIT(20)
81 #define ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B BIT(19)
82 #define ANADIG_USB1_CHRG_DETECT_CHK_CONTACT BIT(18)
83
84 #define ANADIG_USB1_VBUS_DET_STAT 0x1c0
85 #define ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID BIT(3)
86
87 #define ANADIG_USB1_CHRG_DET_STAT 0x1d0
88 #define ANADIG_USB1_CHRG_DET_STAT_DM_STATE BIT(2)
89 #define ANADIG_USB1_CHRG_DET_STAT_CHRG_DETECTED BIT(1)
90 #define ANADIG_USB1_CHRG_DET_STAT_PLUG_CONTACT BIT(0)
91
92 #define ANADIG_USB2_VBUS_DET_STAT 0x220
93
94 #define ANADIG_USB1_LOOPBACK_SET 0x1e4
95 #define ANADIG_USB1_LOOPBACK_CLR 0x1e8
96 #define ANADIG_USB1_LOOPBACK_UTMI_TESTSTART BIT(0)
97
98 #define ANADIG_USB2_LOOPBACK_SET 0x244
99 #define ANADIG_USB2_LOOPBACK_CLR 0x248
100
101 #define ANADIG_USB1_MISC 0x1f0
102 #define ANADIG_USB2_MISC 0x250
103
104 #define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG BIT(12)
105 #define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG_SL BIT(11)
106
107 #define BM_ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID BIT(3)
108 #define BM_ANADIG_USB2_VBUS_DET_STAT_VBUS_VALID BIT(3)
109
110 #define BM_ANADIG_USB1_LOOPBACK_UTMI_DIG_TST1 BIT(2)
111 #define BM_ANADIG_USB1_LOOPBACK_TSTI_TX_EN BIT(5)
112 #define BM_ANADIG_USB2_LOOPBACK_UTMI_DIG_TST1 BIT(2)
113 #define BM_ANADIG_USB2_LOOPBACK_TSTI_TX_EN BIT(5)
114
115 #define BM_ANADIG_USB1_MISC_RX_VPIN_FS BIT(29)
116 #define BM_ANADIG_USB1_MISC_RX_VMIN_FS BIT(28)
117 #define BM_ANADIG_USB2_MISC_RX_VPIN_FS BIT(29)
118 #define BM_ANADIG_USB2_MISC_RX_VMIN_FS BIT(28)
119
120 #define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)
121
122 /* Do disconnection between PHY and controller without vbus */
123 #define MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS BIT(0)
124
125 /*
126 * The PHY will be in messy if there is a wakeup after putting
127 * bus to suspend (set portsc.suspendM) but before setting PHY to low
128 * power mode (set portsc.phcd).
129 */
130 #define MXS_PHY_ABNORMAL_IN_SUSPEND BIT(1)
131
132 /*
133 * The SOF sends too fast after resuming, it will cause disconnection
134 * between host and high speed device.
135 */
136 #define MXS_PHY_SENDING_SOF_TOO_FAST BIT(2)
137
138 /*
139 * IC has bug fixes logic, they include
140 * MXS_PHY_ABNORMAL_IN_SUSPEND and MXS_PHY_SENDING_SOF_TOO_FAST
141 * which are described at above flags, the RTL will handle it
142 * according to different versions.
143 */
144 #define MXS_PHY_NEED_IP_FIX BIT(3)
145
146 /* Minimum and maximum values for device tree entries */
147 #define MXS_PHY_TX_CAL45_MIN 35
148 #define MXS_PHY_TX_CAL45_MAX 54
149 #define MXS_PHY_TX_D_CAL_MIN 79
150 #define MXS_PHY_TX_D_CAL_MAX 119
151
152 struct mxs_phy_data {
153 unsigned int flags;
154 };
155
156 static const struct mxs_phy_data imx23_phy_data = {
157 .flags = MXS_PHY_ABNORMAL_IN_SUSPEND | MXS_PHY_SENDING_SOF_TOO_FAST,
158 };
159
160 static const struct mxs_phy_data imx6q_phy_data = {
161 .flags = MXS_PHY_SENDING_SOF_TOO_FAST |
162 MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS |
163 MXS_PHY_NEED_IP_FIX,
164 };
165
166 static const struct mxs_phy_data imx6sl_phy_data = {
167 .flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS |
168 MXS_PHY_NEED_IP_FIX,
169 };
170
171 static const struct mxs_phy_data vf610_phy_data = {
172 .flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS |
173 MXS_PHY_NEED_IP_FIX,
174 };
175
176 static const struct mxs_phy_data imx6sx_phy_data = {
177 .flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS,
178 };
179
180 static const struct mxs_phy_data imx6ul_phy_data = {
181 .flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS,
182 };
183
184 static const struct mxs_phy_data imx7ulp_phy_data = {
185 };
186
187 static const struct of_device_id mxs_phy_dt_ids[] = {
188 { .compatible = "fsl,imx6sx-usbphy", .data = &imx6sx_phy_data, },
189 { .compatible = "fsl,imx6sl-usbphy", .data = &imx6sl_phy_data, },
190 { .compatible = "fsl,imx6q-usbphy", .data = &imx6q_phy_data, },
191 { .compatible = "fsl,imx23-usbphy", .data = &imx23_phy_data, },
192 { .compatible = "fsl,vf610-usbphy", .data = &vf610_phy_data, },
193 { .compatible = "fsl,imx6ul-usbphy", .data = &imx6ul_phy_data, },
194 { .compatible = "fsl,imx7ulp-usbphy", .data = &imx7ulp_phy_data, },
195 { /* sentinel */ }
196 };
197 MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
198
199 struct mxs_phy {
200 struct usb_phy phy;
201 struct clk *clk;
202 const struct mxs_phy_data *data;
203 struct regmap *regmap_anatop;
204 int port_id;
205 u32 tx_reg_set;
206 u32 tx_reg_mask;
207 };
208
is_imx6q_phy(struct mxs_phy * mxs_phy)209 static inline bool is_imx6q_phy(struct mxs_phy *mxs_phy)
210 {
211 return mxs_phy->data == &imx6q_phy_data;
212 }
213
is_imx6sl_phy(struct mxs_phy * mxs_phy)214 static inline bool is_imx6sl_phy(struct mxs_phy *mxs_phy)
215 {
216 return mxs_phy->data == &imx6sl_phy_data;
217 }
218
is_imx7ulp_phy(struct mxs_phy * mxs_phy)219 static inline bool is_imx7ulp_phy(struct mxs_phy *mxs_phy)
220 {
221 return mxs_phy->data == &imx7ulp_phy_data;
222 }
223
224 /*
225 * PHY needs some 32K cycles to switch from 32K clock to
226 * bus (such as AHB/AXI, etc) clock.
227 */
mxs_phy_clock_switch_delay(void)228 static void mxs_phy_clock_switch_delay(void)
229 {
230 usleep_range(300, 400);
231 }
232
mxs_phy_tx_init(struct mxs_phy * mxs_phy)233 static void mxs_phy_tx_init(struct mxs_phy *mxs_phy)
234 {
235 void __iomem *base = mxs_phy->phy.io_priv;
236 u32 phytx;
237
238 /* Update TX register if there is anything to write */
239 if (mxs_phy->tx_reg_mask) {
240 phytx = readl(base + HW_USBPHY_TX);
241 phytx &= ~mxs_phy->tx_reg_mask;
242 phytx |= mxs_phy->tx_reg_set;
243 writel(phytx, base + HW_USBPHY_TX);
244 }
245 }
246
mxs_phy_pll_enable(void __iomem * base,bool enable)247 static int mxs_phy_pll_enable(void __iomem *base, bool enable)
248 {
249 int ret = 0;
250
251 if (enable) {
252 u32 value;
253
254 writel(BM_USBPHY_PLL_REG_ENABLE, base + HW_USBPHY_PLL_SIC_SET);
255 writel(BM_USBPHY_PLL_BYPASS, base + HW_USBPHY_PLL_SIC_CLR);
256 writel(BM_USBPHY_PLL_POWER, base + HW_USBPHY_PLL_SIC_SET);
257 ret = readl_poll_timeout(base + HW_USBPHY_PLL_SIC,
258 value, (value & BM_USBPHY_PLL_LOCK) != 0,
259 100, 10000);
260 if (ret)
261 return ret;
262
263 writel(BM_USBPHY_PLL_EN_USB_CLKS, base +
264 HW_USBPHY_PLL_SIC_SET);
265 } else {
266 writel(BM_USBPHY_PLL_EN_USB_CLKS, base +
267 HW_USBPHY_PLL_SIC_CLR);
268 writel(BM_USBPHY_PLL_POWER, base + HW_USBPHY_PLL_SIC_CLR);
269 writel(BM_USBPHY_PLL_BYPASS, base + HW_USBPHY_PLL_SIC_SET);
270 writel(BM_USBPHY_PLL_REG_ENABLE, base + HW_USBPHY_PLL_SIC_CLR);
271 }
272
273 return ret;
274 }
275
mxs_phy_hw_init(struct mxs_phy * mxs_phy)276 static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
277 {
278 int ret;
279 void __iomem *base = mxs_phy->phy.io_priv;
280
281 if (is_imx7ulp_phy(mxs_phy)) {
282 ret = mxs_phy_pll_enable(base, true);
283 if (ret)
284 return ret;
285 }
286
287 ret = stmp_reset_block(base + HW_USBPHY_CTRL);
288 if (ret)
289 goto disable_pll;
290
291 /* Power up the PHY */
292 writel(0, base + HW_USBPHY_PWD);
293
294 /*
295 * USB PHY Ctrl Setting
296 * - Auto clock/power on
297 * - Enable full/low speed support
298 */
299 writel(BM_USBPHY_CTRL_ENAUTOSET_USBCLKS |
300 BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE |
301 BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD |
302 BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE |
303 BM_USBPHY_CTRL_ENAUTO_PWRON_PLL |
304 BM_USBPHY_CTRL_ENUTMILEVEL2 |
305 BM_USBPHY_CTRL_ENUTMILEVEL3,
306 base + HW_USBPHY_CTRL_SET);
307
308 if (mxs_phy->data->flags & MXS_PHY_NEED_IP_FIX)
309 writel(BM_USBPHY_IP_FIX, base + HW_USBPHY_IP_SET);
310
311 if (mxs_phy->regmap_anatop) {
312 unsigned int reg = mxs_phy->port_id ?
313 ANADIG_USB1_CHRG_DETECT_SET :
314 ANADIG_USB2_CHRG_DETECT_SET;
315 /*
316 * The external charger detector needs to be disabled,
317 * or the signal at DP will be poor
318 */
319 regmap_write(mxs_phy->regmap_anatop, reg,
320 ANADIG_USB1_CHRG_DETECT_EN_B |
321 ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
322 }
323
324 mxs_phy_tx_init(mxs_phy);
325
326 return 0;
327
328 disable_pll:
329 if (is_imx7ulp_phy(mxs_phy))
330 mxs_phy_pll_enable(base, false);
331 return ret;
332 }
333
334 /* Return true if the vbus is there */
mxs_phy_get_vbus_status(struct mxs_phy * mxs_phy)335 static bool mxs_phy_get_vbus_status(struct mxs_phy *mxs_phy)
336 {
337 unsigned int vbus_value = 0;
338
339 if (!mxs_phy->regmap_anatop)
340 return false;
341
342 if (mxs_phy->port_id == 0)
343 regmap_read(mxs_phy->regmap_anatop,
344 ANADIG_USB1_VBUS_DET_STAT,
345 &vbus_value);
346 else if (mxs_phy->port_id == 1)
347 regmap_read(mxs_phy->regmap_anatop,
348 ANADIG_USB2_VBUS_DET_STAT,
349 &vbus_value);
350
351 if (vbus_value & BM_ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID)
352 return true;
353 else
354 return false;
355 }
356
__mxs_phy_disconnect_line(struct mxs_phy * mxs_phy,bool disconnect)357 static void __mxs_phy_disconnect_line(struct mxs_phy *mxs_phy, bool disconnect)
358 {
359 void __iomem *base = mxs_phy->phy.io_priv;
360 u32 reg;
361
362 if (disconnect)
363 writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
364 base + HW_USBPHY_DEBUG_CLR);
365
366 if (mxs_phy->port_id == 0) {
367 reg = disconnect ? ANADIG_USB1_LOOPBACK_SET
368 : ANADIG_USB1_LOOPBACK_CLR;
369 regmap_write(mxs_phy->regmap_anatop, reg,
370 BM_ANADIG_USB1_LOOPBACK_UTMI_DIG_TST1 |
371 BM_ANADIG_USB1_LOOPBACK_TSTI_TX_EN);
372 } else if (mxs_phy->port_id == 1) {
373 reg = disconnect ? ANADIG_USB2_LOOPBACK_SET
374 : ANADIG_USB2_LOOPBACK_CLR;
375 regmap_write(mxs_phy->regmap_anatop, reg,
376 BM_ANADIG_USB2_LOOPBACK_UTMI_DIG_TST1 |
377 BM_ANADIG_USB2_LOOPBACK_TSTI_TX_EN);
378 }
379
380 if (!disconnect)
381 writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
382 base + HW_USBPHY_DEBUG_SET);
383
384 /* Delay some time, and let Linestate be SE0 for controller */
385 if (disconnect)
386 usleep_range(500, 1000);
387 }
388
mxs_phy_is_otg_host(struct mxs_phy * mxs_phy)389 static bool mxs_phy_is_otg_host(struct mxs_phy *mxs_phy)
390 {
391 return IS_ENABLED(CONFIG_USB_OTG) &&
392 mxs_phy->phy.last_event == USB_EVENT_ID;
393 }
394
mxs_phy_disconnect_line(struct mxs_phy * mxs_phy,bool on)395 static void mxs_phy_disconnect_line(struct mxs_phy *mxs_phy, bool on)
396 {
397 bool vbus_is_on = false;
398 enum usb_phy_events last_event = mxs_phy->phy.last_event;
399
400 /* If the SoCs don't need to disconnect line without vbus, quit */
401 if (!(mxs_phy->data->flags & MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS))
402 return;
403
404 /* If the SoCs don't have anatop, quit */
405 if (!mxs_phy->regmap_anatop)
406 return;
407
408 vbus_is_on = mxs_phy_get_vbus_status(mxs_phy);
409
410 if (on && ((!vbus_is_on && !mxs_phy_is_otg_host(mxs_phy))
411 || (last_event == USB_EVENT_VBUS)))
412 __mxs_phy_disconnect_line(mxs_phy, true);
413 else
414 __mxs_phy_disconnect_line(mxs_phy, false);
415
416 }
417
mxs_phy_init(struct usb_phy * phy)418 static int mxs_phy_init(struct usb_phy *phy)
419 {
420 int ret;
421 struct mxs_phy *mxs_phy = to_mxs_phy(phy);
422
423 mxs_phy_clock_switch_delay();
424 ret = clk_prepare_enable(mxs_phy->clk);
425 if (ret)
426 return ret;
427
428 return mxs_phy_hw_init(mxs_phy);
429 }
430
mxs_phy_shutdown(struct usb_phy * phy)431 static void mxs_phy_shutdown(struct usb_phy *phy)
432 {
433 struct mxs_phy *mxs_phy = to_mxs_phy(phy);
434 u32 value = BM_USBPHY_CTRL_ENVBUSCHG_WKUP |
435 BM_USBPHY_CTRL_ENDPDMCHG_WKUP |
436 BM_USBPHY_CTRL_ENIDCHG_WKUP |
437 BM_USBPHY_CTRL_ENAUTOSET_USBCLKS |
438 BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE |
439 BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD |
440 BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE |
441 BM_USBPHY_CTRL_ENAUTO_PWRON_PLL;
442
443 writel(value, phy->io_priv + HW_USBPHY_CTRL_CLR);
444 writel(0xffffffff, phy->io_priv + HW_USBPHY_PWD);
445
446 writel(BM_USBPHY_CTRL_CLKGATE,
447 phy->io_priv + HW_USBPHY_CTRL_SET);
448
449 if (is_imx7ulp_phy(mxs_phy))
450 mxs_phy_pll_enable(phy->io_priv, false);
451
452 clk_disable_unprepare(mxs_phy->clk);
453 }
454
mxs_phy_is_low_speed_connection(struct mxs_phy * mxs_phy)455 static bool mxs_phy_is_low_speed_connection(struct mxs_phy *mxs_phy)
456 {
457 unsigned int line_state;
458 /* bit definition is the same for all controllers */
459 unsigned int dp_bit = BM_ANADIG_USB1_MISC_RX_VPIN_FS,
460 dm_bit = BM_ANADIG_USB1_MISC_RX_VMIN_FS;
461 unsigned int reg = ANADIG_USB1_MISC;
462
463 /* If the SoCs don't have anatop, quit */
464 if (!mxs_phy->regmap_anatop)
465 return false;
466
467 if (mxs_phy->port_id == 0)
468 reg = ANADIG_USB1_MISC;
469 else if (mxs_phy->port_id == 1)
470 reg = ANADIG_USB2_MISC;
471
472 regmap_read(mxs_phy->regmap_anatop, reg, &line_state);
473
474 if ((line_state & (dp_bit | dm_bit)) == dm_bit)
475 return true;
476 else
477 return false;
478 }
479
mxs_phy_suspend(struct usb_phy * x,int suspend)480 static int mxs_phy_suspend(struct usb_phy *x, int suspend)
481 {
482 int ret;
483 struct mxs_phy *mxs_phy = to_mxs_phy(x);
484 bool low_speed_connection, vbus_is_on;
485
486 low_speed_connection = mxs_phy_is_low_speed_connection(mxs_phy);
487 vbus_is_on = mxs_phy_get_vbus_status(mxs_phy);
488
489 if (suspend) {
490 /*
491 * FIXME: Do not power down RXPWD1PT1 bit for low speed
492 * connect. The low speed connection will have problem at
493 * very rare cases during usb suspend and resume process.
494 */
495 if (low_speed_connection & vbus_is_on) {
496 /*
497 * If value to be set as pwd value is not 0xffffffff,
498 * several 32Khz cycles are needed.
499 */
500 mxs_phy_clock_switch_delay();
501 writel(0xffbfffff, x->io_priv + HW_USBPHY_PWD);
502 } else {
503 writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
504 }
505 writel(BM_USBPHY_CTRL_CLKGATE,
506 x->io_priv + HW_USBPHY_CTRL_SET);
507 clk_disable_unprepare(mxs_phy->clk);
508 } else {
509 mxs_phy_clock_switch_delay();
510 ret = clk_prepare_enable(mxs_phy->clk);
511 if (ret)
512 return ret;
513 writel(BM_USBPHY_CTRL_CLKGATE,
514 x->io_priv + HW_USBPHY_CTRL_CLR);
515 writel(0, x->io_priv + HW_USBPHY_PWD);
516 }
517
518 return 0;
519 }
520
mxs_phy_set_wakeup(struct usb_phy * x,bool enabled)521 static int mxs_phy_set_wakeup(struct usb_phy *x, bool enabled)
522 {
523 struct mxs_phy *mxs_phy = to_mxs_phy(x);
524 u32 value = BM_USBPHY_CTRL_ENVBUSCHG_WKUP |
525 BM_USBPHY_CTRL_ENDPDMCHG_WKUP |
526 BM_USBPHY_CTRL_ENIDCHG_WKUP;
527 if (enabled) {
528 mxs_phy_disconnect_line(mxs_phy, true);
529 writel_relaxed(value, x->io_priv + HW_USBPHY_CTRL_SET);
530 } else {
531 writel_relaxed(value, x->io_priv + HW_USBPHY_CTRL_CLR);
532 mxs_phy_disconnect_line(mxs_phy, false);
533 }
534
535 return 0;
536 }
537
mxs_phy_on_connect(struct usb_phy * phy,enum usb_device_speed speed)538 static int mxs_phy_on_connect(struct usb_phy *phy,
539 enum usb_device_speed speed)
540 {
541 dev_dbg(phy->dev, "%s device has connected\n",
542 (speed == USB_SPEED_HIGH) ? "HS" : "FS/LS");
543
544 if (speed == USB_SPEED_HIGH)
545 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
546 phy->io_priv + HW_USBPHY_CTRL_SET);
547
548 return 0;
549 }
550
mxs_phy_on_disconnect(struct usb_phy * phy,enum usb_device_speed speed)551 static int mxs_phy_on_disconnect(struct usb_phy *phy,
552 enum usb_device_speed speed)
553 {
554 dev_dbg(phy->dev, "%s device has disconnected\n",
555 (speed == USB_SPEED_HIGH) ? "HS" : "FS/LS");
556
557 /* Sometimes, the speed is not high speed when the error occurs */
558 if (readl(phy->io_priv + HW_USBPHY_CTRL) &
559 BM_USBPHY_CTRL_ENHOSTDISCONDETECT)
560 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
561 phy->io_priv + HW_USBPHY_CTRL_CLR);
562
563 return 0;
564 }
565
566 #define MXS_USB_CHARGER_DATA_CONTACT_TIMEOUT 100
mxs_charger_data_contact_detect(struct mxs_phy * x)567 static int mxs_charger_data_contact_detect(struct mxs_phy *x)
568 {
569 struct regmap *regmap = x->regmap_anatop;
570 int i, stable_contact_count = 0;
571 u32 val;
572
573 /* Check if vbus is valid */
574 regmap_read(regmap, ANADIG_USB1_VBUS_DET_STAT, &val);
575 if (!(val & ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID)) {
576 dev_err(x->phy.dev, "vbus is not valid\n");
577 return -EINVAL;
578 }
579
580 /* Enable charger detector */
581 regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_CLR,
582 ANADIG_USB1_CHRG_DETECT_EN_B);
583 /*
584 * - Do not check whether a charger is connected to the USB port
585 * - Check whether the USB plug has been in contact with each other
586 */
587 regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_SET,
588 ANADIG_USB1_CHRG_DETECT_CHK_CONTACT |
589 ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
590
591 /* Check if plug is connected */
592 for (i = 0; i < MXS_USB_CHARGER_DATA_CONTACT_TIMEOUT; i++) {
593 regmap_read(regmap, ANADIG_USB1_CHRG_DET_STAT, &val);
594 if (val & ANADIG_USB1_CHRG_DET_STAT_PLUG_CONTACT) {
595 stable_contact_count++;
596 if (stable_contact_count > 5)
597 /* Data pin makes contact */
598 break;
599 else
600 usleep_range(5000, 10000);
601 } else {
602 stable_contact_count = 0;
603 usleep_range(5000, 6000);
604 }
605 }
606
607 if (i == MXS_USB_CHARGER_DATA_CONTACT_TIMEOUT) {
608 dev_err(x->phy.dev,
609 "Data pin can't make good contact.\n");
610 /* Disable charger detector */
611 regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_SET,
612 ANADIG_USB1_CHRG_DETECT_EN_B |
613 ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
614 return -ENXIO;
615 }
616
617 return 0;
618 }
619
mxs_charger_primary_detection(struct mxs_phy * x)620 static enum usb_charger_type mxs_charger_primary_detection(struct mxs_phy *x)
621 {
622 struct regmap *regmap = x->regmap_anatop;
623 enum usb_charger_type chgr_type = UNKNOWN_TYPE;
624 u32 val;
625
626 /*
627 * - Do check whether a charger is connected to the USB port
628 * - Do not Check whether the USB plug has been in contact with
629 * each other
630 */
631 regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_CLR,
632 ANADIG_USB1_CHRG_DETECT_CHK_CONTACT |
633 ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
634
635 msleep(100);
636
637 /* Check if it is a charger */
638 regmap_read(regmap, ANADIG_USB1_CHRG_DET_STAT, &val);
639 if (!(val & ANADIG_USB1_CHRG_DET_STAT_CHRG_DETECTED)) {
640 chgr_type = SDP_TYPE;
641 dev_dbg(x->phy.dev, "It is a standard downstream port\n");
642 }
643
644 /* Disable charger detector */
645 regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_SET,
646 ANADIG_USB1_CHRG_DETECT_EN_B |
647 ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
648
649 return chgr_type;
650 }
651
652 /*
653 * It must be called after DP is pulled up, which is used to
654 * differentiate DCP and CDP.
655 */
mxs_charger_secondary_detection(struct mxs_phy * x)656 static enum usb_charger_type mxs_charger_secondary_detection(struct mxs_phy *x)
657 {
658 struct regmap *regmap = x->regmap_anatop;
659 int val;
660
661 msleep(80);
662
663 regmap_read(regmap, ANADIG_USB1_CHRG_DET_STAT, &val);
664 if (val & ANADIG_USB1_CHRG_DET_STAT_DM_STATE) {
665 dev_dbg(x->phy.dev, "It is a dedicate charging port\n");
666 return DCP_TYPE;
667 } else {
668 dev_dbg(x->phy.dev, "It is a charging downstream port\n");
669 return CDP_TYPE;
670 }
671 }
672
mxs_phy_charger_detect(struct usb_phy * phy)673 static enum usb_charger_type mxs_phy_charger_detect(struct usb_phy *phy)
674 {
675 struct mxs_phy *mxs_phy = to_mxs_phy(phy);
676 struct regmap *regmap = mxs_phy->regmap_anatop;
677 void __iomem *base = phy->io_priv;
678 enum usb_charger_type chgr_type = UNKNOWN_TYPE;
679
680 if (!regmap)
681 return UNKNOWN_TYPE;
682
683 if (mxs_charger_data_contact_detect(mxs_phy))
684 return chgr_type;
685
686 chgr_type = mxs_charger_primary_detection(mxs_phy);
687
688 if (chgr_type != SDP_TYPE) {
689 /* Pull up DP via test */
690 writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
691 base + HW_USBPHY_DEBUG_CLR);
692 regmap_write(regmap, ANADIG_USB1_LOOPBACK_SET,
693 ANADIG_USB1_LOOPBACK_UTMI_TESTSTART);
694
695 chgr_type = mxs_charger_secondary_detection(mxs_phy);
696
697 /* Stop the test */
698 regmap_write(regmap, ANADIG_USB1_LOOPBACK_CLR,
699 ANADIG_USB1_LOOPBACK_UTMI_TESTSTART);
700 writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
701 base + HW_USBPHY_DEBUG_SET);
702 }
703
704 return chgr_type;
705 }
706
mxs_phy_probe(struct platform_device * pdev)707 static int mxs_phy_probe(struct platform_device *pdev)
708 {
709 void __iomem *base;
710 struct clk *clk;
711 struct mxs_phy *mxs_phy;
712 int ret;
713 struct device_node *np = pdev->dev.of_node;
714 u32 val;
715
716 base = devm_platform_ioremap_resource(pdev, 0);
717 if (IS_ERR(base))
718 return PTR_ERR(base);
719
720 clk = devm_clk_get(&pdev->dev, NULL);
721 if (IS_ERR(clk)) {
722 dev_err(&pdev->dev,
723 "can't get the clock, err=%ld", PTR_ERR(clk));
724 return PTR_ERR(clk);
725 }
726
727 mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
728 if (!mxs_phy)
729 return -ENOMEM;
730
731 /* Some SoCs don't have anatop registers */
732 if (of_property_present(np, "fsl,anatop")) {
733 mxs_phy->regmap_anatop = syscon_regmap_lookup_by_phandle
734 (np, "fsl,anatop");
735 if (IS_ERR(mxs_phy->regmap_anatop)) {
736 dev_dbg(&pdev->dev,
737 "failed to find regmap for anatop\n");
738 return PTR_ERR(mxs_phy->regmap_anatop);
739 }
740 }
741
742 /* Precompute which bits of the TX register are to be updated, if any */
743 if (!of_property_read_u32(np, "fsl,tx-cal-45-dn-ohms", &val) &&
744 val >= MXS_PHY_TX_CAL45_MIN && val <= MXS_PHY_TX_CAL45_MAX) {
745 /* Scale to a 4-bit value */
746 val = (MXS_PHY_TX_CAL45_MAX - val) * 0xF
747 / (MXS_PHY_TX_CAL45_MAX - MXS_PHY_TX_CAL45_MIN);
748 mxs_phy->tx_reg_mask |= GM_USBPHY_TX_TXCAL45DN(~0);
749 mxs_phy->tx_reg_set |= GM_USBPHY_TX_TXCAL45DN(val);
750 }
751
752 if (!of_property_read_u32(np, "fsl,tx-cal-45-dp-ohms", &val) &&
753 val >= MXS_PHY_TX_CAL45_MIN && val <= MXS_PHY_TX_CAL45_MAX) {
754 /* Scale to a 4-bit value. */
755 val = (MXS_PHY_TX_CAL45_MAX - val) * 0xF
756 / (MXS_PHY_TX_CAL45_MAX - MXS_PHY_TX_CAL45_MIN);
757 mxs_phy->tx_reg_mask |= GM_USBPHY_TX_TXCAL45DP(~0);
758 mxs_phy->tx_reg_set |= GM_USBPHY_TX_TXCAL45DP(val);
759 }
760
761 if (!of_property_read_u32(np, "fsl,tx-d-cal", &val) &&
762 val >= MXS_PHY_TX_D_CAL_MIN && val <= MXS_PHY_TX_D_CAL_MAX) {
763 /* Scale to a 4-bit value. Round up the values and heavily
764 * weight the rounding by adding 2/3 of the denominator.
765 */
766 val = ((MXS_PHY_TX_D_CAL_MAX - val) * 0xF
767 + (MXS_PHY_TX_D_CAL_MAX - MXS_PHY_TX_D_CAL_MIN) * 2/3)
768 / (MXS_PHY_TX_D_CAL_MAX - MXS_PHY_TX_D_CAL_MIN);
769 mxs_phy->tx_reg_mask |= GM_USBPHY_TX_D_CAL(~0);
770 mxs_phy->tx_reg_set |= GM_USBPHY_TX_D_CAL(val);
771 }
772
773 ret = of_alias_get_id(np, "usbphy");
774 if (ret < 0)
775 dev_dbg(&pdev->dev, "failed to get alias id, errno %d\n", ret);
776 mxs_phy->port_id = ret;
777
778 mxs_phy->phy.io_priv = base;
779 mxs_phy->phy.dev = &pdev->dev;
780 mxs_phy->phy.label = DRIVER_NAME;
781 mxs_phy->phy.init = mxs_phy_init;
782 mxs_phy->phy.shutdown = mxs_phy_shutdown;
783 mxs_phy->phy.set_suspend = mxs_phy_suspend;
784 mxs_phy->phy.notify_connect = mxs_phy_on_connect;
785 mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect;
786 mxs_phy->phy.type = USB_PHY_TYPE_USB2;
787 mxs_phy->phy.set_wakeup = mxs_phy_set_wakeup;
788 mxs_phy->phy.charger_detect = mxs_phy_charger_detect;
789
790 mxs_phy->clk = clk;
791 mxs_phy->data = of_device_get_match_data(&pdev->dev);
792
793 platform_set_drvdata(pdev, mxs_phy);
794
795 device_set_wakeup_capable(&pdev->dev, true);
796
797 return usb_add_phy_dev(&mxs_phy->phy);
798 }
799
mxs_phy_remove(struct platform_device * pdev)800 static void mxs_phy_remove(struct platform_device *pdev)
801 {
802 struct mxs_phy *mxs_phy = platform_get_drvdata(pdev);
803
804 usb_remove_phy(&mxs_phy->phy);
805 }
806
807 #ifdef CONFIG_PM_SLEEP
mxs_phy_enable_ldo_in_suspend(struct mxs_phy * mxs_phy,bool on)808 static void mxs_phy_enable_ldo_in_suspend(struct mxs_phy *mxs_phy, bool on)
809 {
810 unsigned int reg = on ? ANADIG_ANA_MISC0_SET : ANADIG_ANA_MISC0_CLR;
811
812 /* If the SoCs don't have anatop, quit */
813 if (!mxs_phy->regmap_anatop)
814 return;
815
816 if (is_imx6q_phy(mxs_phy))
817 regmap_write(mxs_phy->regmap_anatop, reg,
818 BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG);
819 else if (is_imx6sl_phy(mxs_phy))
820 regmap_write(mxs_phy->regmap_anatop,
821 reg, BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG_SL);
822 }
823
mxs_phy_system_suspend(struct device * dev)824 static int mxs_phy_system_suspend(struct device *dev)
825 {
826 struct mxs_phy *mxs_phy = dev_get_drvdata(dev);
827
828 if (device_may_wakeup(dev))
829 mxs_phy_enable_ldo_in_suspend(mxs_phy, true);
830
831 return 0;
832 }
833
mxs_phy_system_resume(struct device * dev)834 static int mxs_phy_system_resume(struct device *dev)
835 {
836 struct mxs_phy *mxs_phy = dev_get_drvdata(dev);
837
838 if (device_may_wakeup(dev))
839 mxs_phy_enable_ldo_in_suspend(mxs_phy, false);
840
841 return 0;
842 }
843 #endif /* CONFIG_PM_SLEEP */
844
845 static SIMPLE_DEV_PM_OPS(mxs_phy_pm, mxs_phy_system_suspend,
846 mxs_phy_system_resume);
847
848 static struct platform_driver mxs_phy_driver = {
849 .probe = mxs_phy_probe,
850 .remove_new = mxs_phy_remove,
851 .driver = {
852 .name = DRIVER_NAME,
853 .of_match_table = mxs_phy_dt_ids,
854 .pm = &mxs_phy_pm,
855 },
856 };
857
mxs_phy_module_init(void)858 static int __init mxs_phy_module_init(void)
859 {
860 return platform_driver_register(&mxs_phy_driver);
861 }
862 postcore_initcall(mxs_phy_module_init);
863
mxs_phy_module_exit(void)864 static void __exit mxs_phy_module_exit(void)
865 {
866 platform_driver_unregister(&mxs_phy_driver);
867 }
868 module_exit(mxs_phy_module_exit);
869
870 MODULE_ALIAS("platform:mxs-usb-phy");
871 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
872 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
873 MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
874 MODULE_LICENSE("GPL");
875
