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b93931a6 PO |
1 | /* |
2 | * linux/drivers/mmc/core/host.c | |
3 | * | |
4 | * Copyright (C) 2003 Russell King, All Rights Reserved. | |
5 | * Copyright (C) 2007 Pierre Ossman | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * MMC host class device management | |
12 | */ | |
13 | ||
14 | #include <linux/device.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/idr.h> | |
17 | #include <linux/pagemap.h> | |
18 | ||
19 | #include <linux/mmc/host.h> | |
20 | ||
21 | #include "core.h" | |
22 | #include "host.h" | |
23 | ||
24 | #define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev) | |
25 | ||
26 | static void mmc_host_classdev_release(struct device *dev) | |
27 | { | |
28 | struct mmc_host *host = cls_dev_to_mmc_host(dev); | |
29 | kfree(host); | |
30 | } | |
31 | ||
32 | static struct class mmc_host_class = { | |
33 | .name = "mmc_host", | |
34 | .dev_release = mmc_host_classdev_release, | |
35 | }; | |
36 | ||
37 | int mmc_register_host_class(void) | |
38 | { | |
39 | return class_register(&mmc_host_class); | |
40 | } | |
41 | ||
42 | void mmc_unregister_host_class(void) | |
43 | { | |
44 | class_unregister(&mmc_host_class); | |
45 | } | |
46 | ||
47 | static DEFINE_IDR(mmc_host_idr); | |
48 | static DEFINE_SPINLOCK(mmc_host_lock); | |
49 | ||
50 | /** | |
51 | * mmc_alloc_host - initialise the per-host structure. | |
52 | * @extra: sizeof private data structure | |
53 | * @dev: pointer to host device model structure | |
54 | * | |
55 | * Initialise the per-host structure. | |
56 | */ | |
57 | struct mmc_host *mmc_alloc_host(int extra, struct device *dev) | |
58 | { | |
59 | struct mmc_host *host; | |
60 | ||
61 | host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL); | |
62 | if (!host) | |
63 | return NULL; | |
64 | ||
65 | memset(host, 0, sizeof(struct mmc_host) + extra); | |
66 | ||
67 | host->parent = dev; | |
68 | host->class_dev.parent = dev; | |
69 | host->class_dev.class = &mmc_host_class; | |
70 | device_initialize(&host->class_dev); | |
71 | ||
72 | spin_lock_init(&host->lock); | |
73 | init_waitqueue_head(&host->wq); | |
74 | INIT_DELAYED_WORK(&host->detect, mmc_rescan); | |
75 | ||
76 | /* | |
77 | * By default, hosts do not support SGIO or large requests. | |
78 | * They have to set these according to their abilities. | |
79 | */ | |
80 | host->max_hw_segs = 1; | |
81 | host->max_phys_segs = 1; | |
82 | host->max_seg_size = PAGE_CACHE_SIZE; | |
83 | ||
84 | host->max_req_size = PAGE_CACHE_SIZE; | |
85 | host->max_blk_size = 512; | |
86 | host->max_blk_count = PAGE_CACHE_SIZE / 512; | |
87 | ||
88 | return host; | |
89 | } | |
90 | ||
91 | EXPORT_SYMBOL(mmc_alloc_host); | |
92 | ||
93 | /** | |
94 | * mmc_add_host - initialise host hardware | |
95 | * @host: mmc host | |
96 | */ | |
97 | int mmc_add_host(struct mmc_host *host) | |
98 | { | |
99 | int err; | |
100 | ||
101 | if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL)) | |
102 | return -ENOMEM; | |
103 | ||
104 | spin_lock(&mmc_host_lock); | |
105 | err = idr_get_new(&mmc_host_idr, host, &host->index); | |
106 | spin_unlock(&mmc_host_lock); | |
107 | if (err) | |
108 | return err; | |
109 | ||
110 | snprintf(host->class_dev.bus_id, BUS_ID_SIZE, | |
111 | "mmc%d", host->index); | |
112 | ||
113 | err = device_add(&host->class_dev); | |
114 | if (err) | |
115 | return err; | |
116 | ||
117 | mmc_start_host(host); | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
122 | EXPORT_SYMBOL(mmc_add_host); | |
123 | ||
124 | /** | |
125 | * mmc_remove_host - remove host hardware | |
126 | * @host: mmc host | |
127 | * | |
128 | * Unregister and remove all cards associated with this host, | |
129 | * and power down the MMC bus. | |
130 | */ | |
131 | void mmc_remove_host(struct mmc_host *host) | |
132 | { | |
133 | mmc_stop_host(host); | |
134 | ||
135 | device_del(&host->class_dev); | |
136 | ||
137 | spin_lock(&mmc_host_lock); | |
138 | idr_remove(&mmc_host_idr, host->index); | |
139 | spin_unlock(&mmc_host_lock); | |
140 | } | |
141 | ||
142 | EXPORT_SYMBOL(mmc_remove_host); | |
143 | ||
144 | /** | |
145 | * mmc_free_host - free the host structure | |
146 | * @host: mmc host | |
147 | * | |
148 | * Free the host once all references to it have been dropped. | |
149 | */ | |
150 | void mmc_free_host(struct mmc_host *host) | |
151 | { | |
152 | put_device(&host->class_dev); | |
153 | } | |
154 | ||
155 | EXPORT_SYMBOL(mmc_free_host); | |
156 |