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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> |
2d57a95f DM |
28 | #include <linux/usb.h> |
29 | #include <linux/usb/otg.h> | |
30 | #include <linux/usb/ulpi.h> | |
31 | ||
2d57a95f DM |
32 | #define ULPI_ID(vendor, product) (((vendor) << 16) | (product)) |
33 | ||
2d57a95f DM |
34 | /* ULPI hardcoded IDs, used for probing */ |
35 | static unsigned int ulpi_ids[] = { | |
36 | ULPI_ID(0x04cc, 0x1504), /* NXP ISP1504 */ | |
51a91a54 | 37 | ULPI_ID(0x0424, 0x0006), /* SMSC USB3319 */ |
2d57a95f DM |
38 | }; |
39 | ||
13dd0c97 | 40 | static int ulpi_set_otg_flags(struct otg_transceiver *otg) |
2d57a95f | 41 | { |
13dd0c97 IG |
42 | unsigned int flags = ULPI_OTG_CTRL_DP_PULLDOWN | |
43 | ULPI_OTG_CTRL_DM_PULLDOWN; | |
2d57a95f | 44 | |
13dd0c97 | 45 | if (otg->flags & ULPI_OTG_ID_PULLUP) |
fc567f06 | 46 | flags |= ULPI_OTG_CTRL_ID_PULLUP; |
2d57a95f | 47 | |
13dd0c97 IG |
48 | /* |
49 | * ULPI Specification rev.1.1 default | |
50 | * for Dp/DmPulldown is enabled. | |
51 | */ | |
52 | if (otg->flags & ULPI_OTG_DP_PULLDOWN_DIS) | |
53 | flags &= ~ULPI_OTG_CTRL_DP_PULLDOWN; | |
2d57a95f | 54 | |
13dd0c97 IG |
55 | if (otg->flags & ULPI_OTG_DM_PULLDOWN_DIS) |
56 | flags &= ~ULPI_OTG_CTRL_DM_PULLDOWN; | |
2d57a95f | 57 | |
13dd0c97 | 58 | if (otg->flags & ULPI_OTG_EXTVBUSIND) |
fc567f06 | 59 | flags |= ULPI_OTG_CTRL_EXTVBUSIND; |
2d57a95f | 60 | |
fa345d01 | 61 | return otg_io_write(otg, flags, ULPI_OTG_CTRL); |
2d57a95f DM |
62 | } |
63 | ||
13dd0c97 IG |
64 | static int ulpi_set_fc_flags(struct otg_transceiver *otg) |
65 | { | |
66 | unsigned int flags = 0; | |
67 | ||
68 | /* | |
69 | * ULPI Specification rev.1.1 default | |
70 | * for XcvrSelect is Full Speed. | |
71 | */ | |
72 | if (otg->flags & ULPI_FC_HS) | |
73 | flags |= ULPI_FUNC_CTRL_HIGH_SPEED; | |
74 | else if (otg->flags & ULPI_FC_LS) | |
75 | flags |= ULPI_FUNC_CTRL_LOW_SPEED; | |
76 | else if (otg->flags & ULPI_FC_FS4LS) | |
77 | flags |= ULPI_FUNC_CTRL_FS4LS; | |
78 | else | |
79 | flags |= ULPI_FUNC_CTRL_FULL_SPEED; | |
80 | ||
81 | if (otg->flags & ULPI_FC_TERMSEL) | |
82 | flags |= ULPI_FUNC_CTRL_TERMSELECT; | |
83 | ||
84 | /* | |
85 | * ULPI Specification rev.1.1 default | |
86 | * for OpMode is Normal Operation. | |
87 | */ | |
88 | if (otg->flags & ULPI_FC_OP_NODRV) | |
89 | flags |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING; | |
90 | else if (otg->flags & ULPI_FC_OP_DIS_NRZI) | |
91 | flags |= ULPI_FUNC_CTRL_OPMODE_DISABLE_NRZI; | |
92 | else if (otg->flags & ULPI_FC_OP_NSYNC_NEOP) | |
93 | flags |= ULPI_FUNC_CTRL_OPMODE_NOSYNC_NOEOP; | |
94 | else | |
95 | flags |= ULPI_FUNC_CTRL_OPMODE_NORMAL; | |
96 | ||
97 | /* | |
98 | * ULPI Specification rev.1.1 default | |
99 | * for SuspendM is Powered. | |
100 | */ | |
101 | flags |= ULPI_FUNC_CTRL_SUSPENDM; | |
102 | ||
103 | return otg_io_write(otg, flags, ULPI_FUNC_CTRL); | |
104 | } | |
105 | ||
106 | static int ulpi_set_ic_flags(struct otg_transceiver *otg) | |
107 | { | |
108 | unsigned int flags = 0; | |
109 | ||
110 | if (otg->flags & ULPI_IC_AUTORESUME) | |
111 | flags |= ULPI_IFC_CTRL_AUTORESUME; | |
112 | ||
113 | if (otg->flags & ULPI_IC_EXTVBUS_INDINV) | |
114 | flags |= ULPI_IFC_CTRL_EXTERNAL_VBUS; | |
115 | ||
116 | if (otg->flags & ULPI_IC_IND_PASSTHRU) | |
117 | flags |= ULPI_IFC_CTRL_PASSTHRU; | |
118 | ||
119 | if (otg->flags & ULPI_IC_PROTECT_DIS) | |
120 | flags |= ULPI_IFC_CTRL_PROTECT_IFC_DISABLE; | |
121 | ||
122 | return otg_io_write(otg, flags, ULPI_IFC_CTRL); | |
123 | } | |
124 | ||
125 | static int ulpi_set_flags(struct otg_transceiver *otg) | |
126 | { | |
127 | int ret; | |
128 | ||
129 | ret = ulpi_set_otg_flags(otg); | |
130 | if (ret) | |
131 | return ret; | |
132 | ||
133 | ret = ulpi_set_ic_flags(otg); | |
134 | if (ret) | |
135 | return ret; | |
136 | ||
137 | return ulpi_set_fc_flags(otg); | |
138 | } | |
139 | ||
a9138192 IG |
140 | static int ulpi_check_integrity(struct otg_transceiver *otg) |
141 | { | |
142 | int ret, i; | |
143 | unsigned int val = 0x55; | |
144 | ||
145 | for (i = 0; i < 2; i++) { | |
146 | ret = otg_io_write(otg, val, ULPI_SCRATCH); | |
147 | if (ret < 0) | |
148 | return ret; | |
149 | ||
150 | ret = otg_io_read(otg, ULPI_SCRATCH); | |
151 | if (ret < 0) | |
152 | return ret; | |
153 | ||
154 | if (ret != val) { | |
155 | pr_err("ULPI integrity check: failed!"); | |
156 | return -ENODEV; | |
157 | } | |
158 | val = val << 1; | |
159 | } | |
160 | ||
161 | pr_info("ULPI integrity check: passed.\n"); | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
2d57a95f DM |
166 | static int ulpi_init(struct otg_transceiver *otg) |
167 | { | |
7b4a0367 WS |
168 | int i, vid, pid, ret; |
169 | u32 ulpi_id = 0; | |
2d57a95f | 170 | |
7b4a0367 WS |
171 | for (i = 0; i < 4; i++) { |
172 | ret = otg_io_read(otg, ULPI_PRODUCT_ID_HIGH - i); | |
173 | if (ret < 0) | |
174 | return ret; | |
175 | ulpi_id = (ulpi_id << 8) | ret; | |
176 | } | |
177 | vid = ulpi_id & 0xffff; | |
178 | pid = ulpi_id >> 16; | |
2d57a95f DM |
179 | |
180 | pr_info("ULPI transceiver vendor/product ID 0x%04x/0x%04x\n", vid, pid); | |
181 | ||
182 | for (i = 0; i < ARRAY_SIZE(ulpi_ids); i++) | |
183 | if (ulpi_ids[i] == ULPI_ID(vid, pid)) | |
a9138192 IG |
184 | break; |
185 | ||
186 | ret = ulpi_check_integrity(otg); | |
187 | if (ret) | |
188 | return ret; | |
2d57a95f | 189 | |
a9138192 | 190 | return ulpi_set_flags(otg); |
2d57a95f DM |
191 | } |
192 | ||
13dd0c97 IG |
193 | static int ulpi_set_host(struct otg_transceiver *otg, struct usb_bus *host) |
194 | { | |
195 | unsigned int flags = otg_io_read(otg, ULPI_IFC_CTRL); | |
196 | ||
197 | if (!host) { | |
198 | otg->host = NULL; | |
199 | return 0; | |
200 | } | |
201 | ||
202 | otg->host = host; | |
203 | ||
204 | flags &= ~(ULPI_IFC_CTRL_6_PIN_SERIAL_MODE | | |
205 | ULPI_IFC_CTRL_3_PIN_SERIAL_MODE | | |
206 | ULPI_IFC_CTRL_CARKITMODE); | |
207 | ||
208 | if (otg->flags & ULPI_IC_6PIN_SERIAL) | |
209 | flags |= ULPI_IFC_CTRL_6_PIN_SERIAL_MODE; | |
210 | else if (otg->flags & ULPI_IC_3PIN_SERIAL) | |
211 | flags |= ULPI_IFC_CTRL_3_PIN_SERIAL_MODE; | |
212 | else if (otg->flags & ULPI_IC_CARKIT) | |
213 | flags |= ULPI_IFC_CTRL_CARKITMODE; | |
214 | ||
215 | return otg_io_write(otg, flags, ULPI_IFC_CTRL); | |
216 | } | |
217 | ||
2d57a95f DM |
218 | static int ulpi_set_vbus(struct otg_transceiver *otg, bool on) |
219 | { | |
fc567f06 | 220 | unsigned int flags = otg_io_read(otg, ULPI_OTG_CTRL); |
2d57a95f | 221 | |
fc567f06 | 222 | flags &= ~(ULPI_OTG_CTRL_DRVVBUS | ULPI_OTG_CTRL_DRVVBUS_EXT); |
2d57a95f DM |
223 | |
224 | if (on) { | |
13dd0c97 | 225 | if (otg->flags & ULPI_OTG_DRVVBUS) |
fc567f06 | 226 | flags |= ULPI_OTG_CTRL_DRVVBUS; |
2d57a95f | 227 | |
13dd0c97 | 228 | if (otg->flags & ULPI_OTG_DRVVBUS_EXT) |
fc567f06 | 229 | flags |= ULPI_OTG_CTRL_DRVVBUS_EXT; |
2d57a95f DM |
230 | } |
231 | ||
fa345d01 | 232 | return otg_io_write(otg, flags, ULPI_OTG_CTRL); |
2d57a95f DM |
233 | } |
234 | ||
235 | struct otg_transceiver * | |
236 | otg_ulpi_create(struct otg_io_access_ops *ops, | |
237 | unsigned int flags) | |
238 | { | |
239 | struct otg_transceiver *otg; | |
240 | ||
241 | otg = kzalloc(sizeof(*otg), GFP_KERNEL); | |
242 | if (!otg) | |
243 | return NULL; | |
244 | ||
245 | otg->label = "ULPI"; | |
246 | otg->flags = flags; | |
247 | otg->io_ops = ops; | |
248 | otg->init = ulpi_init; | |
13dd0c97 | 249 | otg->set_host = ulpi_set_host; |
2d57a95f DM |
250 | otg->set_vbus = ulpi_set_vbus; |
251 | ||
252 | return otg; | |
253 | } | |
254 | EXPORT_SYMBOL_GPL(otg_ulpi_create); | |
255 |