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1/*
2 * Generic ULPI USB transceiver support
3 *
4 * Copyright (C) 2009 Daniel Mack <daniel@caiaq.de>
5 *
6 * Based on sources from
7 *
8 * Sascha Hauer <s.hauer@pengutronix.de>
9 * Freescale Semiconductors
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26#include <linux/kernel.h>
27#include <linux/slab.h>
28#include <linux/export.h>
29#include <linux/usb.h>
30#include <linux/usb/otg.h>
31#include <linux/usb/ulpi.h>
32
33
34struct ulpi_info {
35 unsigned int id;
36 char *name;
37};
38
39#define ULPI_ID(vendor, product) (((vendor) << 16) | (product))
40#define ULPI_INFO(_id, _name) \
41 { \
42 .id = (_id), \
43 .name = (_name), \
44 }
45
46/* ULPI hardcoded IDs, used for probing */
47static struct ulpi_info ulpi_ids[] = {
48 ULPI_INFO(ULPI_ID(0x04cc, 0x1504), "NXP ISP1504"),
49 ULPI_INFO(ULPI_ID(0x0424, 0x0006), "SMSC USB331x"),
50 ULPI_INFO(ULPI_ID(0x0424, 0x0007), "SMSC USB3320"),
51 ULPI_INFO(ULPI_ID(0x0424, 0x0009), "SMSC USB334x"),
52 ULPI_INFO(ULPI_ID(0x0451, 0x1507), "TI TUSB1210"),
53};
54
55static int ulpi_set_otg_flags(struct usb_phy *phy)
56{
57 unsigned int flags = ULPI_OTG_CTRL_DP_PULLDOWN |
58 ULPI_OTG_CTRL_DM_PULLDOWN;
59
60 if (phy->flags & ULPI_OTG_ID_PULLUP)
61 flags |= ULPI_OTG_CTRL_ID_PULLUP;
62
63 /*
64 * ULPI Specification rev.1.1 default
65 * for Dp/DmPulldown is enabled.
66 */
67 if (phy->flags & ULPI_OTG_DP_PULLDOWN_DIS)
68 flags &= ~ULPI_OTG_CTRL_DP_PULLDOWN;
69
70 if (phy->flags & ULPI_OTG_DM_PULLDOWN_DIS)
71 flags &= ~ULPI_OTG_CTRL_DM_PULLDOWN;
72
73 if (phy->flags & ULPI_OTG_EXTVBUSIND)
74 flags |= ULPI_OTG_CTRL_EXTVBUSIND;
75
76 return usb_phy_io_write(phy, flags, ULPI_OTG_CTRL);
77}
78
79static int ulpi_set_fc_flags(struct usb_phy *phy)
80{
81 unsigned int flags = 0;
82
83 /*
84 * ULPI Specification rev.1.1 default
85 * for XcvrSelect is Full Speed.
86 */
87 if (phy->flags & ULPI_FC_HS)
88 flags |= ULPI_FUNC_CTRL_HIGH_SPEED;
89 else if (phy->flags & ULPI_FC_LS)
90 flags |= ULPI_FUNC_CTRL_LOW_SPEED;
91 else if (phy->flags & ULPI_FC_FS4LS)
92 flags |= ULPI_FUNC_CTRL_FS4LS;
93 else
94 flags |= ULPI_FUNC_CTRL_FULL_SPEED;
95
96 if (phy->flags & ULPI_FC_TERMSEL)
97 flags |= ULPI_FUNC_CTRL_TERMSELECT;
98
99 /*
100 * ULPI Specification rev.1.1 default
101 * for OpMode is Normal Operation.
102 */
103 if (phy->flags & ULPI_FC_OP_NODRV)
104 flags |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
105 else if (phy->flags & ULPI_FC_OP_DIS_NRZI)
106 flags |= ULPI_FUNC_CTRL_OPMODE_DISABLE_NRZI;
107 else if (phy->flags & ULPI_FC_OP_NSYNC_NEOP)
108 flags |= ULPI_FUNC_CTRL_OPMODE_NOSYNC_NOEOP;
109 else
110 flags |= ULPI_FUNC_CTRL_OPMODE_NORMAL;
111
112 /*
113 * ULPI Specification rev.1.1 default
114 * for SuspendM is Powered.
115 */
116 flags |= ULPI_FUNC_CTRL_SUSPENDM;
117
118 return usb_phy_io_write(phy, flags, ULPI_FUNC_CTRL);
119}
120
121static int ulpi_set_ic_flags(struct usb_phy *phy)
122{
123 unsigned int flags = 0;
124
125 if (phy->flags & ULPI_IC_AUTORESUME)
126 flags |= ULPI_IFC_CTRL_AUTORESUME;
127
128 if (phy->flags & ULPI_IC_EXTVBUS_INDINV)
129 flags |= ULPI_IFC_CTRL_EXTERNAL_VBUS;
130
131 if (phy->flags & ULPI_IC_IND_PASSTHRU)
132 flags |= ULPI_IFC_CTRL_PASSTHRU;
133
134 if (phy->flags & ULPI_IC_PROTECT_DIS)
135 flags |= ULPI_IFC_CTRL_PROTECT_IFC_DISABLE;
136
137 return usb_phy_io_write(phy, flags, ULPI_IFC_CTRL);
138}
139
140static int ulpi_set_flags(struct usb_phy *phy)
141{
142 int ret;
143
144 ret = ulpi_set_otg_flags(phy);
145 if (ret)
146 return ret;
147
148 ret = ulpi_set_ic_flags(phy);
149 if (ret)
150 return ret;
151
152 return ulpi_set_fc_flags(phy);
153}
154
155static int ulpi_check_integrity(struct usb_phy *phy)
156{
157 int ret, i;
158 unsigned int val = 0x55;
159
160 for (i = 0; i < 2; i++) {
161 ret = usb_phy_io_write(phy, val, ULPI_SCRATCH);
162 if (ret < 0)
163 return ret;
164
165 ret = usb_phy_io_read(phy, ULPI_SCRATCH);
166 if (ret < 0)
167 return ret;
168
169 if (ret != val) {
170 pr_err("ULPI integrity check: failed!");
171 return -ENODEV;
172 }
173 val = val << 1;
174 }
175
176 pr_info("ULPI integrity check: passed.\n");
177
178 return 0;
179}
180
181static int ulpi_init(struct usb_phy *phy)
182{
183 int i, vid, pid, ret;
184 u32 ulpi_id = 0;
185
186 for (i = 0; i < 4; i++) {
187 ret = usb_phy_io_read(phy, ULPI_PRODUCT_ID_HIGH - i);
188 if (ret < 0)
189 return ret;
190 ulpi_id = (ulpi_id << 8) | ret;
191 }
192 vid = ulpi_id & 0xffff;
193 pid = ulpi_id >> 16;
194
195 pr_info("ULPI transceiver vendor/product ID 0x%04x/0x%04x\n", vid, pid);
196
197 for (i = 0; i < ARRAY_SIZE(ulpi_ids); i++) {
198 if (ulpi_ids[i].id == ULPI_ID(vid, pid)) {
199 pr_info("Found %s ULPI transceiver.\n",
200 ulpi_ids[i].name);
201 break;
202 }
203 }
204
205 ret = ulpi_check_integrity(phy);
206 if (ret)
207 return ret;
208
209 return ulpi_set_flags(phy);
210}
211
212static int ulpi_set_host(struct usb_otg *otg, struct usb_bus *host)
213{
214 struct usb_phy *phy = otg->usb_phy;
215 unsigned int flags = usb_phy_io_read(phy, ULPI_IFC_CTRL);
216
217 if (!host) {
218 otg->host = NULL;
219 return 0;
220 }
221
222 otg->host = host;
223
224 flags &= ~(ULPI_IFC_CTRL_6_PIN_SERIAL_MODE |
225 ULPI_IFC_CTRL_3_PIN_SERIAL_MODE |
226 ULPI_IFC_CTRL_CARKITMODE);
227
228 if (phy->flags & ULPI_IC_6PIN_SERIAL)
229 flags |= ULPI_IFC_CTRL_6_PIN_SERIAL_MODE;
230 else if (phy->flags & ULPI_IC_3PIN_SERIAL)
231 flags |= ULPI_IFC_CTRL_3_PIN_SERIAL_MODE;
232 else if (phy->flags & ULPI_IC_CARKIT)
233 flags |= ULPI_IFC_CTRL_CARKITMODE;
234
235 return usb_phy_io_write(phy, flags, ULPI_IFC_CTRL);
236}
237
238static int ulpi_set_vbus(struct usb_otg *otg, bool on)
239{
240 struct usb_phy *phy = otg->usb_phy;
241 unsigned int flags = usb_phy_io_read(phy, ULPI_OTG_CTRL);
242
243 flags &= ~(ULPI_OTG_CTRL_DRVVBUS | ULPI_OTG_CTRL_DRVVBUS_EXT);
244
245 if (on) {
246 if (phy->flags & ULPI_OTG_DRVVBUS)
247 flags |= ULPI_OTG_CTRL_DRVVBUS;
248
249 if (phy->flags & ULPI_OTG_DRVVBUS_EXT)
250 flags |= ULPI_OTG_CTRL_DRVVBUS_EXT;
251 }
252
253 return usb_phy_io_write(phy, flags, ULPI_OTG_CTRL);
254}
255
256struct usb_phy *
257otg_ulpi_create(struct usb_phy_io_ops *ops,
258 unsigned int flags)
259{
260 struct usb_phy *phy;
261 struct usb_otg *otg;
262
263 phy = kzalloc(sizeof(*phy), GFP_KERNEL);
264 if (!phy)
265 return NULL;
266
267 otg = kzalloc(sizeof(*otg), GFP_KERNEL);
268 if (!otg) {
269 kfree(phy);
270 return NULL;
271 }
272
273 phy->label = "ULPI";
274 phy->flags = flags;
275 phy->io_ops = ops;
276 phy->otg = otg;
277 phy->init = ulpi_init;
278
279 otg->usb_phy = phy;
280 otg->set_host = ulpi_set_host;
281 otg->set_vbus = ulpi_set_vbus;
282
283 return phy;
284}
285EXPORT_SYMBOL_GPL(otg_ulpi_create);
286