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2d57a95f DM |
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> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
f940fcd8 | 28 | #include <linux/export.h> |
2d57a95f DM |
29 | #include <linux/usb.h> |
30 | #include <linux/usb/otg.h> | |
31 | #include <linux/usb/ulpi.h> | |
32 | ||
96b9e832 IG |
33 | |
34 | struct ulpi_info { | |
35 | unsigned int id; | |
36 | char *name; | |
37 | }; | |
38 | ||
2d57a95f | 39 | #define ULPI_ID(vendor, product) (((vendor) << 16) | (product)) |
96b9e832 IG |
40 | #define ULPI_INFO(_id, _name) \ |
41 | { \ | |
42 | .id = (_id), \ | |
43 | .name = (_name), \ | |
44 | } | |
2d57a95f | 45 | |
2d57a95f | 46 | /* ULPI hardcoded IDs, used for probing */ |
96b9e832 IG |
47 | static struct ulpi_info ulpi_ids[] = { |
48 | ULPI_INFO(ULPI_ID(0x04cc, 0x1504), "NXP ISP1504"), | |
1e4cba8b | 49 | ULPI_INFO(ULPI_ID(0x0424, 0x0006), "SMSC USB331x"), |
2d57a95f DM |
50 | }; |
51 | ||
86753811 | 52 | static int ulpi_set_otg_flags(struct usb_phy *otg) |
2d57a95f | 53 | { |
13dd0c97 IG |
54 | unsigned int flags = ULPI_OTG_CTRL_DP_PULLDOWN | |
55 | ULPI_OTG_CTRL_DM_PULLDOWN; | |
2d57a95f | 56 | |
13dd0c97 | 57 | if (otg->flags & ULPI_OTG_ID_PULLUP) |
fc567f06 | 58 | flags |= ULPI_OTG_CTRL_ID_PULLUP; |
2d57a95f | 59 | |
13dd0c97 IG |
60 | /* |
61 | * ULPI Specification rev.1.1 default | |
62 | * for Dp/DmPulldown is enabled. | |
63 | */ | |
64 | if (otg->flags & ULPI_OTG_DP_PULLDOWN_DIS) | |
65 | flags &= ~ULPI_OTG_CTRL_DP_PULLDOWN; | |
2d57a95f | 66 | |
13dd0c97 IG |
67 | if (otg->flags & ULPI_OTG_DM_PULLDOWN_DIS) |
68 | flags &= ~ULPI_OTG_CTRL_DM_PULLDOWN; | |
2d57a95f | 69 | |
13dd0c97 | 70 | if (otg->flags & ULPI_OTG_EXTVBUSIND) |
fc567f06 | 71 | flags |= ULPI_OTG_CTRL_EXTVBUSIND; |
2d57a95f | 72 | |
fa345d01 | 73 | return otg_io_write(otg, flags, ULPI_OTG_CTRL); |
2d57a95f DM |
74 | } |
75 | ||
86753811 | 76 | static int ulpi_set_fc_flags(struct usb_phy *otg) |
13dd0c97 IG |
77 | { |
78 | unsigned int flags = 0; | |
79 | ||
80 | /* | |
81 | * ULPI Specification rev.1.1 default | |
82 | * for XcvrSelect is Full Speed. | |
83 | */ | |
84 | if (otg->flags & ULPI_FC_HS) | |
85 | flags |= ULPI_FUNC_CTRL_HIGH_SPEED; | |
86 | else if (otg->flags & ULPI_FC_LS) | |
87 | flags |= ULPI_FUNC_CTRL_LOW_SPEED; | |
88 | else if (otg->flags & ULPI_FC_FS4LS) | |
89 | flags |= ULPI_FUNC_CTRL_FS4LS; | |
90 | else | |
91 | flags |= ULPI_FUNC_CTRL_FULL_SPEED; | |
92 | ||
93 | if (otg->flags & ULPI_FC_TERMSEL) | |
94 | flags |= ULPI_FUNC_CTRL_TERMSELECT; | |
95 | ||
96 | /* | |
97 | * ULPI Specification rev.1.1 default | |
98 | * for OpMode is Normal Operation. | |
99 | */ | |
100 | if (otg->flags & ULPI_FC_OP_NODRV) | |
101 | flags |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING; | |
102 | else if (otg->flags & ULPI_FC_OP_DIS_NRZI) | |
103 | flags |= ULPI_FUNC_CTRL_OPMODE_DISABLE_NRZI; | |
104 | else if (otg->flags & ULPI_FC_OP_NSYNC_NEOP) | |
105 | flags |= ULPI_FUNC_CTRL_OPMODE_NOSYNC_NOEOP; | |
106 | else | |
107 | flags |= ULPI_FUNC_CTRL_OPMODE_NORMAL; | |
108 | ||
109 | /* | |
110 | * ULPI Specification rev.1.1 default | |
111 | * for SuspendM is Powered. | |
112 | */ | |
113 | flags |= ULPI_FUNC_CTRL_SUSPENDM; | |
114 | ||
115 | return otg_io_write(otg, flags, ULPI_FUNC_CTRL); | |
116 | } | |
117 | ||
86753811 | 118 | static int ulpi_set_ic_flags(struct usb_phy *otg) |
13dd0c97 IG |
119 | { |
120 | unsigned int flags = 0; | |
121 | ||
122 | if (otg->flags & ULPI_IC_AUTORESUME) | |
123 | flags |= ULPI_IFC_CTRL_AUTORESUME; | |
124 | ||
125 | if (otg->flags & ULPI_IC_EXTVBUS_INDINV) | |
126 | flags |= ULPI_IFC_CTRL_EXTERNAL_VBUS; | |
127 | ||
128 | if (otg->flags & ULPI_IC_IND_PASSTHRU) | |
129 | flags |= ULPI_IFC_CTRL_PASSTHRU; | |
130 | ||
131 | if (otg->flags & ULPI_IC_PROTECT_DIS) | |
132 | flags |= ULPI_IFC_CTRL_PROTECT_IFC_DISABLE; | |
133 | ||
134 | return otg_io_write(otg, flags, ULPI_IFC_CTRL); | |
135 | } | |
136 | ||
86753811 | 137 | static int ulpi_set_flags(struct usb_phy *otg) |
13dd0c97 IG |
138 | { |
139 | int ret; | |
140 | ||
141 | ret = ulpi_set_otg_flags(otg); | |
142 | if (ret) | |
143 | return ret; | |
144 | ||
145 | ret = ulpi_set_ic_flags(otg); | |
146 | if (ret) | |
147 | return ret; | |
148 | ||
149 | return ulpi_set_fc_flags(otg); | |
150 | } | |
151 | ||
86753811 | 152 | static int ulpi_check_integrity(struct usb_phy *otg) |
a9138192 IG |
153 | { |
154 | int ret, i; | |
155 | unsigned int val = 0x55; | |
156 | ||
157 | for (i = 0; i < 2; i++) { | |
158 | ret = otg_io_write(otg, val, ULPI_SCRATCH); | |
159 | if (ret < 0) | |
160 | return ret; | |
161 | ||
162 | ret = otg_io_read(otg, ULPI_SCRATCH); | |
163 | if (ret < 0) | |
164 | return ret; | |
165 | ||
166 | if (ret != val) { | |
167 | pr_err("ULPI integrity check: failed!"); | |
168 | return -ENODEV; | |
169 | } | |
170 | val = val << 1; | |
171 | } | |
172 | ||
173 | pr_info("ULPI integrity check: passed.\n"); | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
86753811 | 178 | static int ulpi_init(struct usb_phy *otg) |
2d57a95f | 179 | { |
7b4a0367 WS |
180 | int i, vid, pid, ret; |
181 | u32 ulpi_id = 0; | |
2d57a95f | 182 | |
7b4a0367 WS |
183 | for (i = 0; i < 4; i++) { |
184 | ret = otg_io_read(otg, ULPI_PRODUCT_ID_HIGH - i); | |
185 | if (ret < 0) | |
186 | return ret; | |
187 | ulpi_id = (ulpi_id << 8) | ret; | |
188 | } | |
189 | vid = ulpi_id & 0xffff; | |
190 | pid = ulpi_id >> 16; | |
2d57a95f DM |
191 | |
192 | pr_info("ULPI transceiver vendor/product ID 0x%04x/0x%04x\n", vid, pid); | |
193 | ||
96b9e832 IG |
194 | for (i = 0; i < ARRAY_SIZE(ulpi_ids); i++) { |
195 | if (ulpi_ids[i].id == ULPI_ID(vid, pid)) { | |
196 | pr_info("Found %s ULPI transceiver.\n", | |
197 | ulpi_ids[i].name); | |
a9138192 | 198 | break; |
96b9e832 IG |
199 | } |
200 | } | |
a9138192 IG |
201 | |
202 | ret = ulpi_check_integrity(otg); | |
203 | if (ret) | |
204 | return ret; | |
2d57a95f | 205 | |
a9138192 | 206 | return ulpi_set_flags(otg); |
2d57a95f DM |
207 | } |
208 | ||
86753811 | 209 | static int ulpi_set_host(struct usb_phy *otg, struct usb_bus *host) |
13dd0c97 IG |
210 | { |
211 | unsigned int flags = otg_io_read(otg, ULPI_IFC_CTRL); | |
212 | ||
213 | if (!host) { | |
214 | otg->host = NULL; | |
215 | return 0; | |
216 | } | |
217 | ||
218 | otg->host = host; | |
219 | ||
220 | flags &= ~(ULPI_IFC_CTRL_6_PIN_SERIAL_MODE | | |
221 | ULPI_IFC_CTRL_3_PIN_SERIAL_MODE | | |
222 | ULPI_IFC_CTRL_CARKITMODE); | |
223 | ||
224 | if (otg->flags & ULPI_IC_6PIN_SERIAL) | |
225 | flags |= ULPI_IFC_CTRL_6_PIN_SERIAL_MODE; | |
226 | else if (otg->flags & ULPI_IC_3PIN_SERIAL) | |
227 | flags |= ULPI_IFC_CTRL_3_PIN_SERIAL_MODE; | |
228 | else if (otg->flags & ULPI_IC_CARKIT) | |
229 | flags |= ULPI_IFC_CTRL_CARKITMODE; | |
230 | ||
231 | return otg_io_write(otg, flags, ULPI_IFC_CTRL); | |
232 | } | |
233 | ||
86753811 | 234 | static int ulpi_set_vbus(struct usb_phy *otg, bool on) |
2d57a95f | 235 | { |
fc567f06 | 236 | unsigned int flags = otg_io_read(otg, ULPI_OTG_CTRL); |
2d57a95f | 237 | |
fc567f06 | 238 | flags &= ~(ULPI_OTG_CTRL_DRVVBUS | ULPI_OTG_CTRL_DRVVBUS_EXT); |
2d57a95f DM |
239 | |
240 | if (on) { | |
13dd0c97 | 241 | if (otg->flags & ULPI_OTG_DRVVBUS) |
fc567f06 | 242 | flags |= ULPI_OTG_CTRL_DRVVBUS; |
2d57a95f | 243 | |
13dd0c97 | 244 | if (otg->flags & ULPI_OTG_DRVVBUS_EXT) |
fc567f06 | 245 | flags |= ULPI_OTG_CTRL_DRVVBUS_EXT; |
2d57a95f DM |
246 | } |
247 | ||
fa345d01 | 248 | return otg_io_write(otg, flags, ULPI_OTG_CTRL); |
2d57a95f DM |
249 | } |
250 | ||
86753811 | 251 | struct usb_phy * |
2d57a95f DM |
252 | otg_ulpi_create(struct otg_io_access_ops *ops, |
253 | unsigned int flags) | |
254 | { | |
86753811 | 255 | struct usb_phy *otg; |
2d57a95f DM |
256 | |
257 | otg = kzalloc(sizeof(*otg), GFP_KERNEL); | |
258 | if (!otg) | |
259 | return NULL; | |
260 | ||
261 | otg->label = "ULPI"; | |
262 | otg->flags = flags; | |
263 | otg->io_ops = ops; | |
264 | otg->init = ulpi_init; | |
13dd0c97 | 265 | otg->set_host = ulpi_set_host; |
2d57a95f DM |
266 | otg->set_vbus = ulpi_set_vbus; |
267 | ||
268 | return otg; | |
269 | } | |
270 | EXPORT_SYMBOL_GPL(otg_ulpi_create); | |
271 |