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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> | |
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 | { | |
60 | struct mmc_host *host; | |
61 | ||
be760a9d | 62 | host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL); |
b93931a6 PO |
63 | if (!host) |
64 | return NULL; | |
65 | ||
b93931a6 PO |
66 | host->parent = dev; |
67 | host->class_dev.parent = dev; | |
68 | host->class_dev.class = &mmc_host_class; | |
69 | device_initialize(&host->class_dev); | |
70 | ||
71 | spin_lock_init(&host->lock); | |
72 | init_waitqueue_head(&host->wq); | |
73 | INIT_DELAYED_WORK(&host->detect, mmc_rescan); | |
74 | ||
75 | /* | |
76 | * By default, hosts do not support SGIO or large requests. | |
77 | * They have to set these according to their abilities. | |
78 | */ | |
79 | host->max_hw_segs = 1; | |
80 | host->max_phys_segs = 1; | |
81 | host->max_seg_size = PAGE_CACHE_SIZE; | |
82 | ||
83 | host->max_req_size = PAGE_CACHE_SIZE; | |
84 | host->max_blk_size = 512; | |
85 | host->max_blk_count = PAGE_CACHE_SIZE / 512; | |
86 | ||
87 | return host; | |
88 | } | |
89 | ||
90 | EXPORT_SYMBOL(mmc_alloc_host); | |
91 | ||
92 | /** | |
93 | * mmc_add_host - initialise host hardware | |
94 | * @host: mmc host | |
67a61c48 PO |
95 | * |
96 | * Register the host with the driver model. The host must be | |
97 | * prepared to start servicing requests before this function | |
98 | * completes. | |
b93931a6 PO |
99 | */ |
100 | int mmc_add_host(struct mmc_host *host) | |
101 | { | |
102 | int err; | |
103 | ||
17b759af NP |
104 | WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) && |
105 | !host->ops->enable_sdio_irq); | |
106 | ||
b93931a6 PO |
107 | if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL)) |
108 | return -ENOMEM; | |
109 | ||
110 | spin_lock(&mmc_host_lock); | |
111 | err = idr_get_new(&mmc_host_idr, host, &host->index); | |
112 | spin_unlock(&mmc_host_lock); | |
113 | if (err) | |
114 | return err; | |
115 | ||
116 | snprintf(host->class_dev.bus_id, BUS_ID_SIZE, | |
117 | "mmc%d", host->index); | |
118 | ||
af8350c7 PO |
119 | led_trigger_register_simple(host->class_dev.bus_id, &host->led); |
120 | ||
b93931a6 PO |
121 | err = device_add(&host->class_dev); |
122 | if (err) | |
123 | return err; | |
124 | ||
125 | mmc_start_host(host); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | EXPORT_SYMBOL(mmc_add_host); | |
131 | ||
132 | /** | |
133 | * mmc_remove_host - remove host hardware | |
134 | * @host: mmc host | |
135 | * | |
136 | * Unregister and remove all cards associated with this host, | |
67a61c48 PO |
137 | * and power down the MMC bus. No new requests will be issued |
138 | * after this function has returned. | |
b93931a6 PO |
139 | */ |
140 | void mmc_remove_host(struct mmc_host *host) | |
141 | { | |
142 | mmc_stop_host(host); | |
143 | ||
144 | device_del(&host->class_dev); | |
145 | ||
af8350c7 PO |
146 | led_trigger_unregister(host->led); |
147 | ||
b93931a6 PO |
148 | spin_lock(&mmc_host_lock); |
149 | idr_remove(&mmc_host_idr, host->index); | |
150 | spin_unlock(&mmc_host_lock); | |
151 | } | |
152 | ||
153 | EXPORT_SYMBOL(mmc_remove_host); | |
154 | ||
155 | /** | |
156 | * mmc_free_host - free the host structure | |
157 | * @host: mmc host | |
158 | * | |
159 | * Free the host once all references to it have been dropped. | |
160 | */ | |
161 | void mmc_free_host(struct mmc_host *host) | |
162 | { | |
163 | put_device(&host->class_dev); | |
164 | } | |
165 | ||
166 | EXPORT_SYMBOL(mmc_free_host); | |
167 |