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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Generic ULPI USB transceiver support
4 *
5 * Copyright (C) 2009 Daniel Mack <daniel@caiaq.de>
6 *
7 * Based on sources from
8 *
9 * Sascha Hauer <s.hauer@pengutronix.de>
10 * Freescale Semiconductors
11 */
12
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/export.h>
16#include <linux/usb.h>
17#include <linux/usb/otg.h>
18#include <linux/usb/ulpi.h>
19
20
21struct ulpi_info {
22 unsigned int id;
23 char *name;
24};
25
26#define ULPI_ID(vendor, product) (((vendor) << 16) | (product))
27#define ULPI_INFO(_id, _name) \
28 { \
29 .id = (_id), \
30 .name = (_name), \
31 }
32
33/* ULPI hardcoded IDs, used for probing */
34static struct ulpi_info ulpi_ids[] = {
35 ULPI_INFO(ULPI_ID(0x04cc, 0x1504), "NXP ISP1504"),
36 ULPI_INFO(ULPI_ID(0x0424, 0x0006), "SMSC USB331x"),
37 ULPI_INFO(ULPI_ID(0x0424, 0x0007), "SMSC USB3320"),
38 ULPI_INFO(ULPI_ID(0x0424, 0x0009), "SMSC USB334x"),
39 ULPI_INFO(ULPI_ID(0x0451, 0x1507), "TI TUSB1210"),
40};
41
42static int ulpi_set_otg_flags(struct usb_phy *phy)
43{
44 unsigned int flags = ULPI_OTG_CTRL_DP_PULLDOWN |
45 ULPI_OTG_CTRL_DM_PULLDOWN;
46
47 if (phy->flags & ULPI_OTG_ID_PULLUP)
48 flags |= ULPI_OTG_CTRL_ID_PULLUP;
49
50 /*
51 * ULPI Specification rev.1.1 default
52 * for Dp/DmPulldown is enabled.
53 */
54 if (phy->flags & ULPI_OTG_DP_PULLDOWN_DIS)
55 flags &= ~ULPI_OTG_CTRL_DP_PULLDOWN;
56
57 if (phy->flags & ULPI_OTG_DM_PULLDOWN_DIS)
58 flags &= ~ULPI_OTG_CTRL_DM_PULLDOWN;
59
60 if (phy->flags & ULPI_OTG_EXTVBUSIND)
61 flags |= ULPI_OTG_CTRL_EXTVBUSIND;
62
63 return usb_phy_io_write(phy, flags, ULPI_OTG_CTRL);
64}
65
66static int ulpi_set_fc_flags(struct usb_phy *phy)
67{
68 unsigned int flags = 0;
69
70 /*
71 * ULPI Specification rev.1.1 default
72 * for XcvrSelect is Full Speed.
73 */
74 if (phy->flags & ULPI_FC_HS)
75 flags |= ULPI_FUNC_CTRL_HIGH_SPEED;
76 else if (phy->flags & ULPI_FC_LS)
77 flags |= ULPI_FUNC_CTRL_LOW_SPEED;
78 else if (phy->flags & ULPI_FC_FS4LS)
79 flags |= ULPI_FUNC_CTRL_FS4LS;
80 else
81 flags |= ULPI_FUNC_CTRL_FULL_SPEED;
82
83 if (phy->flags & ULPI_FC_TERMSEL)
84 flags |= ULPI_FUNC_CTRL_TERMSELECT;
85
86 /*
87 * ULPI Specification rev.1.1 default
88 * for OpMode is Normal Operation.
89 */
90 if (phy->flags & ULPI_FC_OP_NODRV)
91 flags |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
92 else if (phy->flags & ULPI_FC_OP_DIS_NRZI)
93 flags |= ULPI_FUNC_CTRL_OPMODE_DISABLE_NRZI;
94 else if (phy->flags & ULPI_FC_OP_NSYNC_NEOP)
95 flags |= ULPI_FUNC_CTRL_OPMODE_NOSYNC_NOEOP;
96 else
97 flags |= ULPI_FUNC_CTRL_OPMODE_NORMAL;
98
99 /*
100 * ULPI Specification rev.1.1 default
101 * for SuspendM is Powered.
102 */
103 flags |= ULPI_FUNC_CTRL_SUSPENDM;
104
105 return usb_phy_io_write(phy, flags, ULPI_FUNC_CTRL);
106}
107
108static int ulpi_set_ic_flags(struct usb_phy *phy)
109{
110 unsigned int flags = 0;
111
112 if (phy->flags & ULPI_IC_AUTORESUME)
113 flags |= ULPI_IFC_CTRL_AUTORESUME;
114
115 if (phy->flags & ULPI_IC_EXTVBUS_INDINV)
116 flags |= ULPI_IFC_CTRL_EXTERNAL_VBUS;
117
118 if (phy->flags & ULPI_IC_IND_PASSTHRU)
119 flags |= ULPI_IFC_CTRL_PASSTHRU;
120
121 if (phy->flags & ULPI_IC_PROTECT_DIS)
122 flags |= ULPI_IFC_CTRL_PROTECT_IFC_DISABLE;
123
124 return usb_phy_io_write(phy, flags, ULPI_IFC_CTRL);
125}
126
127static int ulpi_set_flags(struct usb_phy *phy)
128{
129 int ret;
130
131 ret = ulpi_set_otg_flags(phy);
132 if (ret)
133 return ret;
134
135 ret = ulpi_set_ic_flags(phy);
136 if (ret)
137 return ret;
138
139 return ulpi_set_fc_flags(phy);
140}
141
142static int ulpi_check_integrity(struct usb_phy *phy)
143{
144 int ret, i;
145 unsigned int val = 0x55;
146
147 for (i = 0; i < 2; i++) {
148 ret = usb_phy_io_write(phy, val, ULPI_SCRATCH);
149 if (ret < 0)
150 return ret;
151
152 ret = usb_phy_io_read(phy, ULPI_SCRATCH);
153 if (ret < 0)
154 return ret;
155
156 if (ret != val) {
157 pr_err("ULPI integrity check: failed!");
158 return -ENODEV;
159 }
160 val = val << 1;
161 }
162
163 pr_info("ULPI integrity check: passed.\n");
164
165 return 0;
166}
167
168static int ulpi_init(struct usb_phy *phy)
169{
170 int i, vid, pid, ret;
171 u32 ulpi_id = 0;
172
173 for (i = 0; i < 4; i++) {
174 ret = usb_phy_io_read(phy, ULPI_PRODUCT_ID_HIGH - i);
175 if (ret < 0)
176 return ret;
177 ulpi_id = (ulpi_id << 8) | ret;
178 }
179 vid = ulpi_id & 0xffff;
180 pid = ulpi_id >> 16;
181
182 pr_info("ULPI transceiver vendor/product ID 0x%04x/0x%04x\n", vid, pid);
183
184 for (i = 0; i < ARRAY_SIZE(ulpi_ids); i++) {
185 if (ulpi_ids[i].id == ULPI_ID(vid, pid)) {
186 pr_info("Found %s ULPI transceiver.\n",
187 ulpi_ids[i].name);
188 break;
189 }
190 }
191
192 ret = ulpi_check_integrity(phy);
193 if (ret)
194 return ret;
195
196 return ulpi_set_flags(phy);
197}
198
199static int ulpi_set_host(struct usb_otg *otg, struct usb_bus *host)
200{
201 struct usb_phy *phy = otg->usb_phy;
202 unsigned int flags = usb_phy_io_read(phy, ULPI_IFC_CTRL);
203
204 if (!host) {
205 otg->host = NULL;
206 return 0;
207 }
208
209 otg->host = host;
210
211 flags &= ~(ULPI_IFC_CTRL_6_PIN_SERIAL_MODE |
212 ULPI_IFC_CTRL_3_PIN_SERIAL_MODE |
213 ULPI_IFC_CTRL_CARKITMODE);
214
215 if (phy->flags & ULPI_IC_6PIN_SERIAL)
216 flags |= ULPI_IFC_CTRL_6_PIN_SERIAL_MODE;
217 else if (phy->flags & ULPI_IC_3PIN_SERIAL)
218 flags |= ULPI_IFC_CTRL_3_PIN_SERIAL_MODE;
219 else if (phy->flags & ULPI_IC_CARKIT)
220 flags |= ULPI_IFC_CTRL_CARKITMODE;
221
222 return usb_phy_io_write(phy, flags, ULPI_IFC_CTRL);
223}
224
225static int ulpi_set_vbus(struct usb_otg *otg, bool on)
226{
227 struct usb_phy *phy = otg->usb_phy;
228 unsigned int flags = usb_phy_io_read(phy, ULPI_OTG_CTRL);
229
230 flags &= ~(ULPI_OTG_CTRL_DRVVBUS | ULPI_OTG_CTRL_DRVVBUS_EXT);
231
232 if (on) {
233 if (phy->flags & ULPI_OTG_DRVVBUS)
234 flags |= ULPI_OTG_CTRL_DRVVBUS;
235
236 if (phy->flags & ULPI_OTG_DRVVBUS_EXT)
237 flags |= ULPI_OTG_CTRL_DRVVBUS_EXT;
238 }
239
240 return usb_phy_io_write(phy, flags, ULPI_OTG_CTRL);
241}
242
243static void otg_ulpi_init(struct usb_phy *phy, struct usb_otg *otg,
244 struct usb_phy_io_ops *ops,
245 unsigned int flags)
246{
247 phy->label = "ULPI";
248 phy->flags = flags;
249 phy->io_ops = ops;
250 phy->otg = otg;
251 phy->init = ulpi_init;
252
253 otg->usb_phy = phy;
254 otg->set_host = ulpi_set_host;
255 otg->set_vbus = ulpi_set_vbus;
256}
257
258struct usb_phy *
259otg_ulpi_create(struct usb_phy_io_ops *ops,
260 unsigned int flags)
261{
262 struct usb_phy *phy;
263 struct usb_otg *otg;
264
265 phy = kzalloc(sizeof(*phy), GFP_KERNEL);
266 if (!phy)
267 return NULL;
268
269 otg = kzalloc(sizeof(*otg), GFP_KERNEL);
270 if (!otg) {
271 kfree(phy);
272 return NULL;
273 }
274
275 otg_ulpi_init(phy, otg, ops, flags);
276
277 return phy;
278}
279EXPORT_SYMBOL_GPL(otg_ulpi_create);
280
281struct usb_phy *
282devm_otg_ulpi_create(struct device *dev,
283 struct usb_phy_io_ops *ops,
284 unsigned int flags)
285{
286 struct usb_phy *phy;
287 struct usb_otg *otg;
288
289 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
290 if (!phy)
291 return NULL;
292
293 otg = devm_kzalloc(dev, sizeof(*otg), GFP_KERNEL);
294 if (!otg) {
295 devm_kfree(dev, phy);
296 return NULL;
297 }
298
299 otg_ulpi_init(phy, otg, ops, flags);
300
301 return phy;
302}
303EXPORT_SYMBOL_GPL(devm_otg_ulpi_create);