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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> | |
4e57b681 | 32 | #include <linux/string.h> |
1da177e4 LT |
33 | |
34 | /** | |
35 | * mca_device_read_stored_pos - read POS register from stored data | |
36 | * @mca_dev: device to read from | |
37 | * @reg: register to read from | |
38 | * | |
39 | * Fetch a POS value that was stored at boot time by the kernel | |
40 | * when it scanned the MCA space. The register value is returned. | |
41 | * Missing or invalid registers report 0. | |
42 | */ | |
43 | unsigned char mca_device_read_stored_pos(struct mca_device *mca_dev, int reg) | |
44 | { | |
45 | if(reg < 0 || reg >= 8) | |
46 | return 0; | |
47 | ||
48 | return mca_dev->pos[reg]; | |
49 | } | |
50 | EXPORT_SYMBOL(mca_device_read_stored_pos); | |
51 | ||
52 | /** | |
53 | * mca_device_read_pos - read POS register from card | |
54 | * @mca_dev: device to read from | |
55 | * @reg: register to read from | |
56 | * | |
57 | * Fetch a POS value directly from the hardware to obtain the | |
58 | * current value. This is much slower than | |
59 | * mca_device_read_stored_pos and may not be invoked from | |
60 | * interrupt context. It handles the deep magic required for | |
61 | * onboard devices transparently. | |
62 | */ | |
63 | unsigned char mca_device_read_pos(struct mca_device *mca_dev, int reg) | |
64 | { | |
65 | struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent); | |
66 | ||
67 | return mca_bus->f.mca_read_pos(mca_dev, reg); | |
68 | ||
69 | return mca_dev->pos[reg]; | |
70 | } | |
71 | EXPORT_SYMBOL(mca_device_read_pos); | |
72 | ||
73 | ||
74 | /** | |
75 | * mca_device_write_pos - read POS register from card | |
76 | * @mca_dev: device to write pos register to | |
77 | * @reg: register to write to | |
78 | * @byte: byte to write to the POS registers | |
79 | * | |
80 | * Store a POS value directly to the hardware. You should not | |
81 | * normally need to use this function and should have a very good | |
82 | * knowledge of MCA bus before you do so. Doing this wrongly can | |
83 | * damage the hardware. | |
84 | * | |
85 | * This function may not be used from interrupt context. | |
86 | * | |
87 | */ | |
88 | void mca_device_write_pos(struct mca_device *mca_dev, int reg, | |
89 | unsigned char byte) | |
90 | { | |
91 | struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent); | |
92 | ||
93 | mca_bus->f.mca_write_pos(mca_dev, reg, byte); | |
94 | } | |
95 | EXPORT_SYMBOL(mca_device_write_pos); | |
96 | ||
97 | /** | |
98 | * mca_device_transform_irq - transform the ADF obtained IRQ | |
99 | * @mca_device: device whose irq needs transforming | |
100 | * @irq: input irq from ADF | |
101 | * | |
102 | * MCA Adapter Definition Files (ADF) contain irq, ioport, memory | |
103 | * etc. definitions. In systems with more than one bus, these need | |
104 | * to be transformed through bus mapping functions to get the real | |
105 | * system global quantities. | |
106 | * | |
107 | * This function transforms the interrupt number and returns the | |
108 | * transformed system global interrupt | |
109 | */ | |
110 | int mca_device_transform_irq(struct mca_device *mca_dev, int irq) | |
111 | { | |
112 | struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent); | |
113 | ||
114 | return mca_bus->f.mca_transform_irq(mca_dev, irq); | |
115 | } | |
116 | EXPORT_SYMBOL(mca_device_transform_irq); | |
117 | ||
118 | /** | |
119 | * mca_device_transform_ioport - transform the ADF obtained I/O port | |
120 | * @mca_device: device whose port needs transforming | |
121 | * @ioport: input I/O port from ADF | |
122 | * | |
123 | * MCA Adapter Definition Files (ADF) contain irq, ioport, memory | |
124 | * etc. definitions. In systems with more than one bus, these need | |
125 | * to be transformed through bus mapping functions to get the real | |
126 | * system global quantities. | |
127 | * | |
128 | * This function transforms the I/O port number and returns the | |
129 | * transformed system global port number. | |
130 | * | |
131 | * This transformation can be assumed to be linear for port ranges. | |
132 | */ | |
133 | int mca_device_transform_ioport(struct mca_device *mca_dev, int port) | |
134 | { | |
135 | struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent); | |
136 | ||
137 | return mca_bus->f.mca_transform_ioport(mca_dev, port); | |
138 | } | |
139 | EXPORT_SYMBOL(mca_device_transform_ioport); | |
140 | ||
141 | /** | |
142 | * mca_device_transform_memory - transform the ADF obtained memory | |
143 | * @mca_device: device whose memory region needs transforming | |
144 | * @mem: memory region start from ADF | |
145 | * | |
146 | * MCA Adapter Definition Files (ADF) contain irq, ioport, memory | |
147 | * etc. definitions. In systems with more than one bus, these need | |
148 | * to be transformed through bus mapping functions to get the real | |
149 | * system global quantities. | |
150 | * | |
151 | * This function transforms the memory region start and returns the | |
152 | * transformed system global memory region (physical). | |
153 | * | |
154 | * This transformation can be assumed to be linear for region ranges. | |
155 | */ | |
156 | void *mca_device_transform_memory(struct mca_device *mca_dev, void *mem) | |
157 | { | |
158 | struct mca_bus *mca_bus = to_mca_bus(mca_dev->dev.parent); | |
159 | ||
160 | return mca_bus->f.mca_transform_memory(mca_dev, mem); | |
161 | } | |
162 | EXPORT_SYMBOL(mca_device_transform_memory); | |
163 | ||
164 | ||
165 | /** | |
166 | * mca_device_claimed - check if claimed by driver | |
167 | * @mca_dev: device to check | |
168 | * | |
169 | * Returns 1 if the slot has been claimed by a driver | |
170 | */ | |
171 | ||
172 | int mca_device_claimed(struct mca_device *mca_dev) | |
173 | { | |
174 | return mca_dev->driver_loaded; | |
175 | } | |
176 | EXPORT_SYMBOL(mca_device_claimed); | |
177 | ||
178 | /** | |
179 | * mca_device_set_claim - set the claim value of the driver | |
180 | * @mca_dev: device to set value for | |
181 | * @val: claim value to set (1 claimed, 0 unclaimed) | |
182 | */ | |
183 | void mca_device_set_claim(struct mca_device *mca_dev, int val) | |
184 | { | |
185 | mca_dev->driver_loaded = val; | |
186 | } | |
187 | EXPORT_SYMBOL(mca_device_set_claim); | |
188 | ||
189 | /** | |
190 | * mca_device_status - get the status of the device | |
191 | * @mca_device: device to get | |
192 | * | |
193 | * returns an enumeration of the device status: | |
194 | * | |
195 | * MCA_ADAPTER_NORMAL adapter is OK. | |
196 | * MCA_ADAPTER_NONE no adapter at device (should never happen). | |
197 | * MCA_ADAPTER_DISABLED adapter is disabled. | |
198 | * MCA_ADAPTER_ERROR adapter cannot be initialised. | |
199 | */ | |
200 | enum MCA_AdapterStatus mca_device_status(struct mca_device *mca_dev) | |
201 | { | |
202 | return mca_dev->status; | |
203 | } | |
204 | EXPORT_SYMBOL(mca_device_status); | |
205 | ||
206 | /** | |
207 | * mca_device_set_name - set the name of the device | |
208 | * @mca_device: device to set the name of | |
209 | * @name: name to set | |
210 | */ | |
211 | void mca_device_set_name(struct mca_device *mca_dev, const char *name) | |
212 | { | |
213 | if(!mca_dev) | |
214 | return; | |
215 | ||
216 | strlcpy(mca_dev->name, name, sizeof(mca_dev->name)); | |
217 | } | |
218 | EXPORT_SYMBOL(mca_device_set_name); |