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1 | /* -*- mode: c; c-basic-offset: 8 -*- */ |
2 | ||
3 | /* | |
4 | * MCA device support functions | |
5 | * | |
6 | * These functions support the ongoing device access API. | |
7 | * | |
8 | * (C) 2002 James Bottomley <James.Bottomley@HansenPartnership.com> | |
9 | * | |
10 | **----------------------------------------------------------------------------- | |
11 | ** | |
12 | ** This program is free software; you can redistribute it and/or modify | |
13 | ** it under the terms of the GNU General Public License as published by | |
14 | ** the Free Software Foundation; either version 2 of the License, or | |
15 | ** (at your option) any later version. | |
16 | ** | |
17 | ** This program is distributed in the hope that it will be useful, | |
18 | ** but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ** GNU General Public License for more details. | |
21 | ** | |
22 | ** You should have received a copy of the GNU General Public License | |
23 | ** along with this program; if not, write to the Free Software | |
24 | ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
25 | ** | |
26 | **----------------------------------------------------------------------------- | |
27 | */ | |
28 | ||
29 | #include <linux/module.h> | |
30 | #include <linux/device.h> | |
31 | #include <linux/mca.h> | |
32 | ||
33 | /** | |
34 | * mca_device_read_stored_pos - read POS register from stored data | |
35 | * @mca_dev: device to read from | |
36 | * @reg: register to read from | |
37 | * | |
38 | * Fetch a POS value that was stored at boot time by the kernel | |
39 | * when it scanned the MCA space. The register value is returned. | |
40 | * Missing or invalid registers report 0. | |
41 | */ | |
42 | unsigned char mca_device_read_stored_pos(struct mca_device *mca_dev, int reg) | |
43 | { | |
44 | if(reg < 0 || reg >= 8) | |
45 | return 0; | |
46 | ||
47 | return mca_dev->pos[reg]; | |
48 | } | |
49 | EXPORT_SYMBOL(mca_device_read_stored_pos); | |
50 | ||
51 | /** | |
52 | * mca_device_read_pos - read POS register from card | |
53 | * @mca_dev: device to read from | |
54 | * @reg: register to read from | |
55 | * | |
56 | * Fetch a POS value directly from the hardware to obtain the | |
57 | * current value. This is much slower than | |
58 | * mca_device_read_stored_pos and may not be invoked from | |
59 | * interrupt context. It handles the deep magic required for | |
60 | * onboard devices transparently. | |
61 | */ | |
62 | unsigned char mca_device_read_pos(struct mca_device *mca_dev, int reg) | |
63 | { | |
64 | struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent); | |
65 | ||
66 | return mca_bus->f.mca_read_pos(mca_dev, reg); | |
67 | ||
68 | return mca_dev->pos[reg]; | |
69 | } | |
70 | EXPORT_SYMBOL(mca_device_read_pos); | |
71 | ||
72 | ||
73 | /** | |
74 | * mca_device_write_pos - read POS register from card | |
75 | * @mca_dev: device to write pos register to | |
76 | * @reg: register to write to | |
77 | * @byte: byte to write to the POS registers | |
78 | * | |
79 | * Store a POS value directly to the hardware. You should not | |
80 | * normally need to use this function and should have a very good | |
81 | * knowledge of MCA bus before you do so. Doing this wrongly can | |
82 | * damage the hardware. | |
83 | * | |
84 | * This function may not be used from interrupt context. | |
85 | * | |
86 | */ | |
87 | void mca_device_write_pos(struct mca_device *mca_dev, int reg, | |
88 | unsigned char byte) | |
89 | { | |
90 | struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent); | |
91 | ||
92 | mca_bus->f.mca_write_pos(mca_dev, reg, byte); | |
93 | } | |
94 | EXPORT_SYMBOL(mca_device_write_pos); | |
95 | ||
96 | /** | |
97 | * mca_device_transform_irq - transform the ADF obtained IRQ | |
98 | * @mca_device: device whose irq needs transforming | |
99 | * @irq: input irq from ADF | |
100 | * | |
101 | * MCA Adapter Definition Files (ADF) contain irq, ioport, memory | |
102 | * etc. definitions. In systems with more than one bus, these need | |
103 | * to be transformed through bus mapping functions to get the real | |
104 | * system global quantities. | |
105 | * | |
106 | * This function transforms the interrupt number and returns the | |
107 | * transformed system global interrupt | |
108 | */ | |
109 | int mca_device_transform_irq(struct mca_device *mca_dev, int irq) | |
110 | { | |
111 | struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent); | |
112 | ||
113 | return mca_bus->f.mca_transform_irq(mca_dev, irq); | |
114 | } | |
115 | EXPORT_SYMBOL(mca_device_transform_irq); | |
116 | ||
117 | /** | |
118 | * mca_device_transform_ioport - transform the ADF obtained I/O port | |
119 | * @mca_device: device whose port needs transforming | |
120 | * @ioport: input I/O port from ADF | |
121 | * | |
122 | * MCA Adapter Definition Files (ADF) contain irq, ioport, memory | |
123 | * etc. definitions. In systems with more than one bus, these need | |
124 | * to be transformed through bus mapping functions to get the real | |
125 | * system global quantities. | |
126 | * | |
127 | * This function transforms the I/O port number and returns the | |
128 | * transformed system global port number. | |
129 | * | |
130 | * This transformation can be assumed to be linear for port ranges. | |
131 | */ | |
132 | int mca_device_transform_ioport(struct mca_device *mca_dev, int port) | |
133 | { | |
134 | struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent); | |
135 | ||
136 | return mca_bus->f.mca_transform_ioport(mca_dev, port); | |
137 | } | |
138 | EXPORT_SYMBOL(mca_device_transform_ioport); | |
139 | ||
140 | /** | |
141 | * mca_device_transform_memory - transform the ADF obtained memory | |
142 | * @mca_device: device whose memory region needs transforming | |
143 | * @mem: memory region start from ADF | |
144 | * | |
145 | * MCA Adapter Definition Files (ADF) contain irq, ioport, memory | |
146 | * etc. definitions. In systems with more than one bus, these need | |
147 | * to be transformed through bus mapping functions to get the real | |
148 | * system global quantities. | |
149 | * | |
150 | * This function transforms the memory region start and returns the | |
151 | * transformed system global memory region (physical). | |
152 | * | |
153 | * This transformation can be assumed to be linear for region ranges. | |
154 | */ | |
155 | void *mca_device_transform_memory(struct mca_device *mca_dev, void *mem) | |
156 | { | |
157 | struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent); | |
158 | ||
159 | return mca_bus->f.mca_transform_memory(mca_dev, mem); | |
160 | } | |
161 | EXPORT_SYMBOL(mca_device_transform_memory); | |
162 | ||
163 | ||
164 | /** | |
165 | * mca_device_claimed - check if claimed by driver | |
166 | * @mca_dev: device to check | |
167 | * | |
168 | * Returns 1 if the slot has been claimed by a driver | |
169 | */ | |
170 | ||
171 | int mca_device_claimed(struct mca_device *mca_dev) | |
172 | { | |
173 | return mca_dev->driver_loaded; | |
174 | } | |
175 | EXPORT_SYMBOL(mca_device_claimed); | |
176 | ||
177 | /** | |
178 | * mca_device_set_claim - set the claim value of the driver | |
179 | * @mca_dev: device to set value for | |
180 | * @val: claim value to set (1 claimed, 0 unclaimed) | |
181 | */ | |
182 | void mca_device_set_claim(struct mca_device *mca_dev, int val) | |
183 | { | |
184 | mca_dev->driver_loaded = val; | |
185 | } | |
186 | EXPORT_SYMBOL(mca_device_set_claim); | |
187 | ||
188 | /** | |
189 | * mca_device_status - get the status of the device | |
190 | * @mca_device: device to get | |
191 | * | |
192 | * returns an enumeration of the device status: | |
193 | * | |
194 | * MCA_ADAPTER_NORMAL adapter is OK. | |
195 | * MCA_ADAPTER_NONE no adapter at device (should never happen). | |
196 | * MCA_ADAPTER_DISABLED adapter is disabled. | |
197 | * MCA_ADAPTER_ERROR adapter cannot be initialised. | |
198 | */ | |
199 | enum MCA_AdapterStatus mca_device_status(struct mca_device *mca_dev) | |
200 | { | |
201 | return mca_dev->status; | |
202 | } | |
203 | EXPORT_SYMBOL(mca_device_status); | |
204 | ||
205 | /** | |
206 | * mca_device_set_name - set the name of the device | |
207 | * @mca_device: device to set the name of | |
208 | * @name: name to set | |
209 | */ | |
210 | void mca_device_set_name(struct mca_device *mca_dev, const char *name) | |
211 | { | |
212 | if(!mca_dev) | |
213 | return; | |
214 | ||
215 | strlcpy(mca_dev->name, name, sizeof(mca_dev->name)); | |
216 | } | |
217 | EXPORT_SYMBOL(mca_device_set_name); |