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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> | |
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 | ||
32 | /* ULPI register addresses */ | |
33 | #define ULPI_VID_LOW 0x00 /* Vendor ID low */ | |
34 | #define ULPI_VID_HIGH 0x01 /* Vendor ID high */ | |
35 | #define ULPI_PID_LOW 0x02 /* Product ID low */ | |
36 | #define ULPI_PID_HIGH 0x03 /* Product ID high */ | |
37 | #define ULPI_ITFCTL 0x07 /* Interface Control */ | |
38 | #define ULPI_OTGCTL 0x0A /* OTG Control */ | |
39 | ||
40 | /* add to above register address to access Set/Clear functions */ | |
41 | #define ULPI_REG_SET 0x01 | |
42 | #define ULPI_REG_CLEAR 0x02 | |
43 | ||
44 | /* ULPI OTG Control Register bits */ | |
45 | #define ID_PULL_UP (1 << 0) /* enable ID Pull Up */ | |
46 | #define DP_PULL_DOWN (1 << 1) /* enable DP Pull Down */ | |
47 | #define DM_PULL_DOWN (1 << 2) /* enable DM Pull Down */ | |
48 | #define DISCHRG_VBUS (1 << 3) /* Discharge Vbus */ | |
49 | #define CHRG_VBUS (1 << 4) /* Charge Vbus */ | |
50 | #define DRV_VBUS (1 << 5) /* Drive Vbus */ | |
51 | #define DRV_VBUS_EXT (1 << 6) /* Drive Vbus external */ | |
52 | #define USE_EXT_VBUS_IND (1 << 7) /* Use ext. Vbus indicator */ | |
53 | ||
54 | #define ULPI_ID(vendor, product) (((vendor) << 16) | (product)) | |
55 | ||
56 | #define TR_FLAG(flags, a, b) (((flags) & a) ? b : 0) | |
57 | ||
58 | /* ULPI hardcoded IDs, used for probing */ | |
59 | static unsigned int ulpi_ids[] = { | |
60 | ULPI_ID(0x04cc, 0x1504), /* NXP ISP1504 */ | |
61 | }; | |
62 | ||
63 | static int ulpi_set_flags(struct otg_transceiver *otg) | |
64 | { | |
65 | unsigned int flags = 0; | |
66 | ||
67 | if (otg->flags & USB_OTG_PULLUP_ID) | |
68 | flags |= ID_PULL_UP; | |
69 | ||
70 | if (otg->flags & USB_OTG_PULLDOWN_DM) | |
71 | flags |= DM_PULL_DOWN; | |
72 | ||
73 | if (otg->flags & USB_OTG_PULLDOWN_DP) | |
74 | flags |= DP_PULL_DOWN; | |
75 | ||
76 | if (otg->flags & USB_OTG_EXT_VBUS_INDICATOR) | |
77 | flags |= USE_EXT_VBUS_IND; | |
78 | ||
79 | return otg_io_write(otg, flags, ULPI_OTGCTL + ULPI_REG_SET); | |
80 | } | |
81 | ||
82 | static int ulpi_init(struct otg_transceiver *otg) | |
83 | { | |
84 | int i, vid, pid; | |
85 | ||
86 | vid = (otg_io_read(otg, ULPI_VID_HIGH) << 8) | | |
87 | otg_io_read(otg, ULPI_VID_LOW); | |
88 | pid = (otg_io_read(otg, ULPI_PID_HIGH) << 8) | | |
89 | otg_io_read(otg, ULPI_PID_LOW); | |
90 | ||
91 | pr_info("ULPI transceiver vendor/product ID 0x%04x/0x%04x\n", vid, pid); | |
92 | ||
93 | for (i = 0; i < ARRAY_SIZE(ulpi_ids); i++) | |
94 | if (ulpi_ids[i] == ULPI_ID(vid, pid)) | |
95 | return ulpi_set_flags(otg); | |
96 | ||
97 | pr_err("ULPI ID does not match any known transceiver.\n"); | |
98 | return -ENODEV; | |
99 | } | |
100 | ||
101 | static int ulpi_set_vbus(struct otg_transceiver *otg, bool on) | |
102 | { | |
103 | unsigned int flags = otg_io_read(otg, ULPI_OTGCTL); | |
104 | ||
105 | flags &= ~(DRV_VBUS | DRV_VBUS_EXT); | |
106 | ||
107 | if (on) { | |
108 | if (otg->flags & USB_OTG_DRV_VBUS) | |
109 | flags |= DRV_VBUS; | |
110 | ||
111 | if (otg->flags & USB_OTG_DRV_VBUS_EXT) | |
112 | flags |= DRV_VBUS_EXT; | |
113 | } | |
114 | ||
115 | return otg_io_write(otg, flags, ULPI_OTGCTL + ULPI_REG_SET); | |
116 | } | |
117 | ||
118 | struct otg_transceiver * | |
119 | otg_ulpi_create(struct otg_io_access_ops *ops, | |
120 | unsigned int flags) | |
121 | { | |
122 | struct otg_transceiver *otg; | |
123 | ||
124 | otg = kzalloc(sizeof(*otg), GFP_KERNEL); | |
125 | if (!otg) | |
126 | return NULL; | |
127 | ||
128 | otg->label = "ULPI"; | |
129 | otg->flags = flags; | |
130 | otg->io_ops = ops; | |
131 | otg->init = ulpi_init; | |
132 | otg->set_vbus = ulpi_set_vbus; | |
133 | ||
134 | return otg; | |
135 | } | |
136 | EXPORT_SYMBOL_GPL(otg_ulpi_create); | |
137 |