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b93931a6 PO |
1 | /* |
2 | * linux/drivers/mmc/core/host.c | |
3 | * | |
4 | * Copyright (C) 2003 Russell King, All Rights Reserved. | |
ff3112f5 | 5 | * Copyright (C) 2007-2008 Pierre Ossman |
b93931a6 PO |
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> | |
af8350c7 | 18 | #include <linux/leds.h> |
b93931a6 PO |
19 | |
20 | #include <linux/mmc/host.h> | |
21 | ||
22 | #include "core.h" | |
23 | #include "host.h" | |
24 | ||
25 | #define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev) | |
26 | ||
27 | static void mmc_host_classdev_release(struct device *dev) | |
28 | { | |
29 | struct mmc_host *host = cls_dev_to_mmc_host(dev); | |
30 | kfree(host); | |
31 | } | |
32 | ||
33 | static struct class mmc_host_class = { | |
34 | .name = "mmc_host", | |
35 | .dev_release = mmc_host_classdev_release, | |
36 | }; | |
37 | ||
38 | int mmc_register_host_class(void) | |
39 | { | |
40 | return class_register(&mmc_host_class); | |
41 | } | |
42 | ||
43 | void mmc_unregister_host_class(void) | |
44 | { | |
45 | class_unregister(&mmc_host_class); | |
46 | } | |
47 | ||
48 | static DEFINE_IDR(mmc_host_idr); | |
49 | static DEFINE_SPINLOCK(mmc_host_lock); | |
50 | ||
51 | /** | |
52 | * mmc_alloc_host - initialise the per-host structure. | |
53 | * @extra: sizeof private data structure | |
54 | * @dev: pointer to host device model structure | |
55 | * | |
56 | * Initialise the per-host structure. | |
57 | */ | |
58 | struct mmc_host *mmc_alloc_host(int extra, struct device *dev) | |
59 | { | |
ff3112f5 | 60 | int err; |
b93931a6 PO |
61 | struct mmc_host *host; |
62 | ||
ff3112f5 PO |
63 | if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL)) |
64 | return NULL; | |
65 | ||
be760a9d | 66 | host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL); |
b93931a6 PO |
67 | if (!host) |
68 | return NULL; | |
69 | ||
ff3112f5 PO |
70 | spin_lock(&mmc_host_lock); |
71 | err = idr_get_new(&mmc_host_idr, host, &host->index); | |
72 | spin_unlock(&mmc_host_lock); | |
73 | if (err) | |
74 | goto free; | |
75 | ||
76 | snprintf(host->class_dev.bus_id, BUS_ID_SIZE, | |
77 | "mmc%d", host->index); | |
78 | ||
b93931a6 PO |
79 | host->parent = dev; |
80 | host->class_dev.parent = dev; | |
81 | host->class_dev.class = &mmc_host_class; | |
82 | device_initialize(&host->class_dev); | |
83 | ||
84 | spin_lock_init(&host->lock); | |
85 | init_waitqueue_head(&host->wq); | |
86 | INIT_DELAYED_WORK(&host->detect, mmc_rescan); | |
87 | ||
88 | /* | |
89 | * By default, hosts do not support SGIO or large requests. | |
90 | * They have to set these according to their abilities. | |
91 | */ | |
92 | host->max_hw_segs = 1; | |
93 | host->max_phys_segs = 1; | |
94 | host->max_seg_size = PAGE_CACHE_SIZE; | |
95 | ||
96 | host->max_req_size = PAGE_CACHE_SIZE; | |
97 | host->max_blk_size = 512; | |
98 | host->max_blk_count = PAGE_CACHE_SIZE / 512; | |
99 | ||
100 | return host; | |
ff3112f5 PO |
101 | |
102 | free: | |
103 | kfree(host); | |
104 | return NULL; | |
b93931a6 PO |
105 | } |
106 | ||
107 | EXPORT_SYMBOL(mmc_alloc_host); | |
108 | ||
109 | /** | |
110 | * mmc_add_host - initialise host hardware | |
111 | * @host: mmc host | |
67a61c48 PO |
112 | * |
113 | * Register the host with the driver model. The host must be | |
114 | * prepared to start servicing requests before this function | |
115 | * completes. | |
b93931a6 PO |
116 | */ |
117 | int mmc_add_host(struct mmc_host *host) | |
118 | { | |
119 | int err; | |
120 | ||
17b759af NP |
121 | WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) && |
122 | !host->ops->enable_sdio_irq); | |
123 | ||
af8350c7 PO |
124 | led_trigger_register_simple(host->class_dev.bus_id, &host->led); |
125 | ||
b93931a6 PO |
126 | err = device_add(&host->class_dev); |
127 | if (err) | |
128 | return err; | |
129 | ||
6edd8ee6 HS |
130 | #ifdef CONFIG_DEBUG_FS |
131 | mmc_add_host_debugfs(host); | |
132 | #endif | |
133 | ||
b93931a6 PO |
134 | mmc_start_host(host); |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | EXPORT_SYMBOL(mmc_add_host); | |
140 | ||
141 | /** | |
142 | * mmc_remove_host - remove host hardware | |
143 | * @host: mmc host | |
144 | * | |
145 | * Unregister and remove all cards associated with this host, | |
67a61c48 PO |
146 | * and power down the MMC bus. No new requests will be issued |
147 | * after this function has returned. | |
b93931a6 PO |
148 | */ |
149 | void mmc_remove_host(struct mmc_host *host) | |
150 | { | |
151 | mmc_stop_host(host); | |
152 | ||
6edd8ee6 HS |
153 | #ifdef CONFIG_DEBUG_FS |
154 | mmc_remove_host_debugfs(host); | |
155 | #endif | |
156 | ||
b93931a6 PO |
157 | device_del(&host->class_dev); |
158 | ||
77f1fd6e | 159 | led_trigger_unregister_simple(host->led); |
b93931a6 PO |
160 | } |
161 | ||
162 | EXPORT_SYMBOL(mmc_remove_host); | |
163 | ||
164 | /** | |
165 | * mmc_free_host - free the host structure | |
166 | * @host: mmc host | |
167 | * | |
168 | * Free the host once all references to it have been dropped. | |
169 | */ | |
170 | void mmc_free_host(struct mmc_host *host) | |
171 | { | |
ff3112f5 PO |
172 | spin_lock(&mmc_host_lock); |
173 | idr_remove(&mmc_host_idr, host->index); | |
174 | spin_unlock(&mmc_host_lock); | |
175 | ||
b93931a6 PO |
176 | put_device(&host->class_dev); |
177 | } | |
178 | ||
179 | EXPORT_SYMBOL(mmc_free_host); | |
180 |