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1 | /* |
2 | * linux/drivers/mfd/mcp-core.c | |
3 | * | |
4 | * Copyright (C) 2001 Russell King | |
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. | |
9 | * | |
10 | * Generic MCP (Multimedia Communications Port) layer. All MCP locking | |
11 | * is solely held within this file. | |
12 | */ | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/smp.h> | |
17 | #include <linux/device.h> | |
8c65b4a6 TS |
18 | #include <linux/slab.h> |
19 | #include <linux/string.h> | |
c8602edf | 20 | #include <linux/mfd/mcp.h> |
a4e137ab | 21 | |
a4e137ab RK |
22 | #include <asm/system.h> |
23 | ||
a4e137ab RK |
24 | |
25 | #define to_mcp(d) container_of(d, struct mcp, attached_device) | |
26 | #define to_mcp_driver(d) container_of(d, struct mcp_driver, drv) | |
27 | ||
28 | static int mcp_bus_match(struct device *dev, struct device_driver *drv) | |
29 | { | |
65f2e753 | 30 | return 1; |
a4e137ab RK |
31 | } |
32 | ||
33 | static int mcp_bus_probe(struct device *dev) | |
34 | { | |
35 | struct mcp *mcp = to_mcp(dev); | |
36 | struct mcp_driver *drv = to_mcp_driver(dev->driver); | |
37 | ||
38 | return drv->probe(mcp); | |
39 | } | |
40 | ||
41 | static int mcp_bus_remove(struct device *dev) | |
42 | { | |
43 | struct mcp *mcp = to_mcp(dev); | |
44 | struct mcp_driver *drv = to_mcp_driver(dev->driver); | |
45 | ||
46 | drv->remove(mcp); | |
47 | return 0; | |
48 | } | |
49 | ||
50 | static int mcp_bus_suspend(struct device *dev, pm_message_t state) | |
51 | { | |
52 | struct mcp *mcp = to_mcp(dev); | |
53 | int ret = 0; | |
54 | ||
55 | if (dev->driver) { | |
56 | struct mcp_driver *drv = to_mcp_driver(dev->driver); | |
57 | ||
58 | ret = drv->suspend(mcp, state); | |
59 | } | |
60 | return ret; | |
61 | } | |
62 | ||
63 | static int mcp_bus_resume(struct device *dev) | |
64 | { | |
65 | struct mcp *mcp = to_mcp(dev); | |
66 | int ret = 0; | |
67 | ||
68 | if (dev->driver) { | |
69 | struct mcp_driver *drv = to_mcp_driver(dev->driver); | |
70 | ||
71 | ret = drv->resume(mcp); | |
72 | } | |
73 | return ret; | |
74 | } | |
75 | ||
76 | static struct bus_type mcp_bus_type = { | |
77 | .name = "mcp", | |
78 | .match = mcp_bus_match, | |
413b486e RK |
79 | .probe = mcp_bus_probe, |
80 | .remove = mcp_bus_remove, | |
a4e137ab RK |
81 | .suspend = mcp_bus_suspend, |
82 | .resume = mcp_bus_resume, | |
83 | }; | |
84 | ||
85 | /** | |
86 | * mcp_set_telecom_divisor - set the telecom divisor | |
87 | * @mcp: MCP interface structure | |
88 | * @div: SIB clock divisor | |
89 | * | |
90 | * Set the telecom divisor on the MCP interface. The resulting | |
91 | * sample rate is SIBCLOCK/div. | |
92 | */ | |
93 | void mcp_set_telecom_divisor(struct mcp *mcp, unsigned int div) | |
94 | { | |
98250221 RK |
95 | unsigned long flags; |
96 | ||
97 | spin_lock_irqsave(&mcp->lock, flags); | |
a4e137ab | 98 | mcp->ops->set_telecom_divisor(mcp, div); |
98250221 | 99 | spin_unlock_irqrestore(&mcp->lock, flags); |
a4e137ab RK |
100 | } |
101 | EXPORT_SYMBOL(mcp_set_telecom_divisor); | |
102 | ||
103 | /** | |
104 | * mcp_set_audio_divisor - set the audio divisor | |
105 | * @mcp: MCP interface structure | |
106 | * @div: SIB clock divisor | |
107 | * | |
108 | * Set the audio divisor on the MCP interface. | |
109 | */ | |
110 | void mcp_set_audio_divisor(struct mcp *mcp, unsigned int div) | |
111 | { | |
98250221 RK |
112 | unsigned long flags; |
113 | ||
114 | spin_lock_irqsave(&mcp->lock, flags); | |
a4e137ab | 115 | mcp->ops->set_audio_divisor(mcp, div); |
98250221 | 116 | spin_unlock_irqrestore(&mcp->lock, flags); |
a4e137ab RK |
117 | } |
118 | EXPORT_SYMBOL(mcp_set_audio_divisor); | |
119 | ||
120 | /** | |
121 | * mcp_reg_write - write a device register | |
122 | * @mcp: MCP interface structure | |
123 | * @reg: 4-bit register index | |
124 | * @val: 16-bit data value | |
125 | * | |
126 | * Write a device register. The MCP interface must be enabled | |
127 | * to prevent this function hanging. | |
128 | */ | |
129 | void mcp_reg_write(struct mcp *mcp, unsigned int reg, unsigned int val) | |
130 | { | |
131 | unsigned long flags; | |
132 | ||
133 | spin_lock_irqsave(&mcp->lock, flags); | |
134 | mcp->ops->reg_write(mcp, reg, val); | |
135 | spin_unlock_irqrestore(&mcp->lock, flags); | |
136 | } | |
137 | EXPORT_SYMBOL(mcp_reg_write); | |
138 | ||
139 | /** | |
140 | * mcp_reg_read - read a device register | |
141 | * @mcp: MCP interface structure | |
142 | * @reg: 4-bit register index | |
143 | * | |
144 | * Read a device register and return its value. The MCP interface | |
145 | * must be enabled to prevent this function hanging. | |
146 | */ | |
147 | unsigned int mcp_reg_read(struct mcp *mcp, unsigned int reg) | |
148 | { | |
149 | unsigned long flags; | |
150 | unsigned int val; | |
151 | ||
152 | spin_lock_irqsave(&mcp->lock, flags); | |
153 | val = mcp->ops->reg_read(mcp, reg); | |
154 | spin_unlock_irqrestore(&mcp->lock, flags); | |
155 | ||
156 | return val; | |
157 | } | |
158 | EXPORT_SYMBOL(mcp_reg_read); | |
159 | ||
160 | /** | |
161 | * mcp_enable - enable the MCP interface | |
162 | * @mcp: MCP interface to enable | |
163 | * | |
164 | * Enable the MCP interface. Each call to mcp_enable will need | |
165 | * a corresponding call to mcp_disable to disable the interface. | |
166 | */ | |
167 | void mcp_enable(struct mcp *mcp) | |
168 | { | |
98250221 RK |
169 | unsigned long flags; |
170 | spin_lock_irqsave(&mcp->lock, flags); | |
a4e137ab RK |
171 | if (mcp->use_count++ == 0) |
172 | mcp->ops->enable(mcp); | |
98250221 | 173 | spin_unlock_irqrestore(&mcp->lock, flags); |
a4e137ab RK |
174 | } |
175 | EXPORT_SYMBOL(mcp_enable); | |
176 | ||
177 | /** | |
178 | * mcp_disable - disable the MCP interface | |
179 | * @mcp: MCP interface to disable | |
180 | * | |
181 | * Disable the MCP interface. The MCP interface will only be | |
182 | * disabled once the number of calls to mcp_enable matches the | |
183 | * number of calls to mcp_disable. | |
184 | */ | |
185 | void mcp_disable(struct mcp *mcp) | |
186 | { | |
187 | unsigned long flags; | |
188 | ||
189 | spin_lock_irqsave(&mcp->lock, flags); | |
190 | if (--mcp->use_count == 0) | |
191 | mcp->ops->disable(mcp); | |
192 | spin_unlock_irqrestore(&mcp->lock, flags); | |
193 | } | |
194 | EXPORT_SYMBOL(mcp_disable); | |
195 | ||
196 | static void mcp_release(struct device *dev) | |
197 | { | |
198 | struct mcp *mcp = container_of(dev, struct mcp, attached_device); | |
199 | ||
200 | kfree(mcp); | |
201 | } | |
202 | ||
203 | struct mcp *mcp_host_alloc(struct device *parent, size_t size) | |
204 | { | |
205 | struct mcp *mcp; | |
206 | ||
dd00cc48 | 207 | mcp = kzalloc(sizeof(struct mcp) + size, GFP_KERNEL); |
a4e137ab | 208 | if (mcp) { |
a4e137ab | 209 | spin_lock_init(&mcp->lock); |
30816ac0 | 210 | device_initialize(&mcp->attached_device); |
a4e137ab RK |
211 | mcp->attached_device.parent = parent; |
212 | mcp->attached_device.bus = &mcp_bus_type; | |
213 | mcp->attached_device.dma_mask = parent->dma_mask; | |
214 | mcp->attached_device.release = mcp_release; | |
215 | } | |
216 | return mcp; | |
217 | } | |
218 | EXPORT_SYMBOL(mcp_host_alloc); | |
219 | ||
30816ac0 | 220 | int mcp_host_add(struct mcp *mcp) |
a4e137ab | 221 | { |
b2bf61f2 | 222 | dev_set_name(&mcp->attached_device, "mcp0"); |
30816ac0 | 223 | return device_add(&mcp->attached_device); |
a4e137ab | 224 | } |
30816ac0 | 225 | EXPORT_SYMBOL(mcp_host_add); |
a4e137ab | 226 | |
30816ac0 | 227 | void mcp_host_del(struct mcp *mcp) |
a4e137ab | 228 | { |
30816ac0 | 229 | device_del(&mcp->attached_device); |
a4e137ab | 230 | } |
30816ac0 RK |
231 | EXPORT_SYMBOL(mcp_host_del); |
232 | ||
233 | void mcp_host_free(struct mcp *mcp) | |
234 | { | |
235 | put_device(&mcp->attached_device); | |
236 | } | |
237 | EXPORT_SYMBOL(mcp_host_free); | |
a4e137ab RK |
238 | |
239 | int mcp_driver_register(struct mcp_driver *mcpdrv) | |
240 | { | |
241 | mcpdrv->drv.bus = &mcp_bus_type; | |
a4e137ab RK |
242 | return driver_register(&mcpdrv->drv); |
243 | } | |
244 | EXPORT_SYMBOL(mcp_driver_register); | |
245 | ||
246 | void mcp_driver_unregister(struct mcp_driver *mcpdrv) | |
247 | { | |
248 | driver_unregister(&mcpdrv->drv); | |
249 | } | |
250 | EXPORT_SYMBOL(mcp_driver_unregister); | |
251 | ||
252 | static int __init mcp_init(void) | |
253 | { | |
254 | return bus_register(&mcp_bus_type); | |
255 | } | |
256 | ||
257 | static void __exit mcp_exit(void) | |
258 | { | |
259 | bus_unregister(&mcp_bus_type); | |
260 | } | |
261 | ||
262 | module_init(mcp_init); | |
263 | module_exit(mcp_exit); | |
264 | ||
265 | MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); | |
266 | MODULE_DESCRIPTION("Core multimedia communications port driver"); | |
267 | MODULE_LICENSE("GPL"); |