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5c4e6f13 PO |
1 | /* |
2 | * linux/drivers/mmc/sdio.c | |
3 | * | |
4 | * Copyright 2006-2007 Pierre Ossman | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or (at | |
9 | * your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/err.h> | |
13 | ||
14 | #include <linux/mmc/host.h> | |
15 | #include <linux/mmc/card.h> | |
16 | ||
17 | #include "core.h" | |
18 | #include "bus.h" | |
19 | #include "mmc_ops.h" | |
20 | #include "sd_ops.h" | |
21 | #include "sdio_ops.h" | |
22 | ||
23 | /* | |
24 | * Host is being removed. Free up the current card. | |
25 | */ | |
26 | static void mmc_sdio_remove(struct mmc_host *host) | |
27 | { | |
28 | BUG_ON(!host); | |
29 | BUG_ON(!host->card); | |
30 | ||
31 | mmc_remove_card(host->card); | |
32 | host->card = NULL; | |
33 | } | |
34 | ||
35 | /* | |
36 | * Card detection callback from host. | |
37 | */ | |
38 | static void mmc_sdio_detect(struct mmc_host *host) | |
39 | { | |
40 | int err; | |
41 | ||
42 | BUG_ON(!host); | |
43 | BUG_ON(!host->card); | |
44 | ||
45 | mmc_claim_host(host); | |
46 | ||
47 | /* | |
48 | * Just check if our card has been removed. | |
49 | */ | |
50 | err = mmc_select_card(host->card); | |
51 | ||
52 | mmc_release_host(host); | |
53 | ||
54 | if (err) { | |
55 | mmc_sdio_remove(host); | |
56 | ||
57 | mmc_claim_host(host); | |
58 | mmc_detach_bus(host); | |
59 | mmc_release_host(host); | |
60 | } | |
61 | } | |
62 | ||
63 | ||
64 | static const struct mmc_bus_ops mmc_sdio_ops = { | |
65 | .remove = mmc_sdio_remove, | |
66 | .detect = mmc_sdio_detect, | |
67 | }; | |
68 | ||
69 | ||
70 | /* | |
71 | * Starting point for SDIO card init. | |
72 | */ | |
73 | int mmc_attach_sdio(struct mmc_host *host, u32 ocr) | |
74 | { | |
75 | int err; | |
76 | int funcs; | |
77 | struct mmc_card *card; | |
78 | ||
79 | BUG_ON(!host); | |
80 | BUG_ON(!host->claimed); | |
81 | ||
82 | mmc_attach_bus(host, &mmc_sdio_ops); | |
83 | ||
84 | /* | |
85 | * Sanity check the voltages that the card claims to | |
86 | * support. | |
87 | */ | |
88 | if (ocr & 0x7F) { | |
89 | printk(KERN_WARNING "%s: card claims to support voltages " | |
90 | "below the defined range. These will be ignored.\n", | |
91 | mmc_hostname(host)); | |
92 | ocr &= ~0x7F; | |
93 | } | |
94 | ||
95 | if (ocr & MMC_VDD_165_195) { | |
96 | printk(KERN_WARNING "%s: SDIO card claims to support the " | |
97 | "incompletely defined 'low voltage range'. This " | |
98 | "will be ignored.\n", mmc_hostname(host)); | |
99 | ocr &= ~MMC_VDD_165_195; | |
100 | } | |
101 | ||
102 | host->ocr = mmc_select_voltage(host, ocr); | |
103 | ||
104 | /* | |
105 | * Can we support the voltage(s) of the card(s)? | |
106 | */ | |
107 | if (!host->ocr) { | |
108 | err = -EINVAL; | |
109 | goto err; | |
110 | } | |
111 | ||
112 | /* | |
113 | * Inform the card of the voltage | |
114 | */ | |
115 | err = mmc_send_io_op_cond(host, host->ocr, &ocr); | |
116 | if (err) | |
117 | goto err; | |
118 | ||
119 | /* | |
120 | * The number of functions on the card is encoded inside | |
121 | * the ocr. | |
122 | */ | |
123 | funcs = (ocr & 0x70000000) >> 28; | |
124 | ||
125 | /* | |
126 | * Allocate card structure. | |
127 | */ | |
128 | card = mmc_alloc_card(host); | |
129 | if (IS_ERR(card)) { | |
130 | err = PTR_ERR(card); | |
131 | goto err; | |
132 | } | |
133 | ||
134 | card->type = MMC_TYPE_SDIO; | |
135 | ||
136 | /* | |
137 | * Set card RCA. | |
138 | */ | |
139 | err = mmc_send_relative_addr(host, &card->rca); | |
140 | if (err) | |
141 | goto free_card; | |
142 | ||
143 | mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); | |
144 | ||
145 | /* | |
146 | * Select card, as all following commands rely on that. | |
147 | */ | |
148 | err = mmc_select_card(card); | |
149 | if (err) | |
150 | goto free_card; | |
151 | ||
152 | host->card = card; | |
153 | ||
154 | mmc_release_host(host); | |
155 | ||
156 | err = mmc_add_card(host->card); | |
157 | if (err) | |
158 | goto reclaim_host; | |
159 | ||
160 | return 0; | |
161 | ||
162 | reclaim_host: | |
163 | mmc_claim_host(host); | |
164 | free_card: | |
165 | mmc_remove_card(card); | |
166 | host->card = NULL; | |
167 | err: | |
168 | mmc_detach_bus(host); | |
169 | mmc_release_host(host); | |
170 | ||
171 | printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n", | |
172 | mmc_hostname(host), err); | |
173 | ||
174 | return err; | |
175 | } | |
176 |