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 #include <linux/leds.h>
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
62 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
63 if (!host)
64 return NULL;
65
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
95 *
96 * Register the host with the driver model. The host must be
97 * prepared to start servicing requests before this function
98 * completes.
99 */
100 int mmc_add_host(struct mmc_host *host)
101 {
102 int err;
103
104 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
105 !host->ops->enable_sdio_irq);
106
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
119 led_trigger_register_simple(host->class_dev.bus_id, &host->led);
120
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,
137 * and power down the MMC bus. No new requests will be issued
138 * after this function has returned.
139 */
140 void mmc_remove_host(struct mmc_host *host)
141 {
142 mmc_stop_host(host);
143
144 device_del(&host->class_dev);
145
146 led_trigger_unregister_simple(host->led);
147
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
168
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