Root/drivers/dio/dio.c

1/* Code to support devices on the DIO and DIO-II bus
2 * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
3 * Copyright (C) 2004 Jochen Friedrich <jochen@scram.de>
4 *
5 * This code has basically these routines at the moment:
6 * int dio_find(u_int deviceid)
7 * Search the list of DIO devices and return the select code
8 * of the next unconfigured device found that matches the given device ID.
9 * Note that the deviceid parameter should be the encoded ID.
10 * This means that framebuffers should pass it as
11 * DIO_ENCODE_ID(DIO_ID_FBUFFER,DIO_ID2_TOPCAT)
12 * (or whatever); everybody else just uses DIO_ID_FOOBAR.
13 * unsigned long dio_scodetophysaddr(int scode)
14 * Return the physical address corresponding to the given select code.
15 * int dio_scodetoipl(int scode)
16 * Every DIO card has a fixed interrupt priority level. This function
17 * returns it, whatever it is.
18 * const char *dio_scodetoname(int scode)
19 * Return a character string describing this board [might be "" if
20 * not CONFIG_DIO_CONSTANTS]
21 * void dio_config_board(int scode) mark board as configured in the list
22 * void dio_unconfig_board(int scode) mark board as no longer configured
23 *
24 * This file is based on the way the Amiga port handles Zorro II cards,
25 * although we aren't so complicated...
26 */
27#include <linux/module.h>
28#include <linux/string.h>
29#include <linux/types.h>
30#include <linux/kernel.h>
31#include <linux/init.h>
32#include <linux/dio.h>
33#include <linux/slab.h> /* kmalloc() */
34#include <asm/uaccess.h>
35#include <asm/io.h> /* readb() */
36
37struct dio_bus dio_bus = {
38    .resources = {
39        /* DIO range */
40        { .name = "DIO mem", .start = 0x00600000, .end = 0x007fffff },
41        /* DIO-II range */
42        { .name = "DIO-II mem", .start = 0x01000000, .end = 0x1fffffff }
43    },
44    .name = "DIO bus"
45};
46
47/* not a real config option yet! */
48#define CONFIG_DIO_CONSTANTS
49
50#ifdef CONFIG_DIO_CONSTANTS
51/* We associate each numeric ID with an appropriate descriptive string
52 * using a constant array of these structs.
53 * FIXME: we should be able to arrange to throw away most of the strings
54 * using the initdata stuff. Then we wouldn't need to worry about
55 * carrying them around...
56 * I think we do this by copying them into newly kmalloc()ed memory and
57 * marking the names[] array as .initdata ?
58 */
59struct dioname
60{
61        int id;
62        const char *name;
63};
64
65/* useful macro */
66#define DIONAME(x) { DIO_ID_##x, DIO_DESC_##x }
67#define DIOFBNAME(x) { DIO_ENCODE_ID( DIO_ID_FBUFFER, DIO_ID2_##x), DIO_DESC2_##x }
68
69static struct dioname names[] =
70{
71        DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM),
72        DIONAME(DCM), DIONAME(DCMREM),
73        DIONAME(LAN),
74        DIONAME(FHPIB), DIONAME(NHPIB),
75        DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3),
76        DIONAME(FBUFFER),
77        DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM),
78        DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3),
79        DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7),
80        DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11),
81        DIONAME(MISC12), DIONAME(MISC13),
82        DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE),
83        DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE),
84        DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION),
85        DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS)
86};
87
88#undef DIONAME
89#undef DIOFBNAME
90
91static const char *unknowndioname
92        = "unknown DIO board -- please email <linux-m68k@lists.linux-m68k.org>!";
93
94static const char *dio_getname(int id)
95{
96        /* return pointer to a constant string describing the board with given ID */
97    unsigned int i;
98    for (i = 0; i < ARRAY_SIZE(names); i++)
99                if (names[i].id == id)
100                        return names[i].name;
101
102        return unknowndioname;
103}
104
105#else
106
107static char dio_no_name[] = { 0 };
108#define dio_getname(_id) (dio_no_name)
109
110#endif /* CONFIG_DIO_CONSTANTS */
111
112int __init dio_find(int deviceid)
113{
114    /* Called to find a DIO device before the full bus scan has run.
115     * Only used by the console driver.
116     */
117    int scode, id;
118    u_char prid, secid, i;
119    mm_segment_t fs;
120
121    for (scode = 0; scode < DIO_SCMAX; scode++) {
122        void *va;
123        unsigned long pa;
124
125                if (DIO_SCINHOLE(scode))
126                        continue;
127
128                pa = dio_scodetophysaddr(scode);
129
130        if (!pa)
131            continue;
132
133        if (scode < DIOII_SCBASE)
134            va = (void *)(pa + DIO_VIRADDRBASE);
135        else
136            va = ioremap(pa, PAGE_SIZE);
137
138        fs = get_fs();
139        set_fs(KERNEL_DS);
140
141                if (get_user(i, (unsigned char *)va + DIO_IDOFF)) {
142            set_fs(fs);
143            if (scode >= DIOII_SCBASE)
144                iounmap(va);
145                        continue; /* no board present at that select code */
146        }
147
148        set_fs(fs);
149        prid = DIO_ID(va);
150
151                if (DIO_NEEDSSECID(prid)) {
152                        secid = DIO_SECID(va);
153                        id = DIO_ENCODE_ID(prid, secid);
154                } else
155            id = prid;
156
157        if (id == deviceid) {
158            if (scode >= DIOII_SCBASE)
159                iounmap(va);
160            return scode;
161        }
162    }
163
164    return -1;
165}
166
167/* This is the function that scans the DIO space and works out what
168 * hardware is actually present.
169 */
170static int __init dio_init(void)
171{
172    int scode;
173    mm_segment_t fs;
174    int i;
175    struct dio_dev *dev;
176    int error;
177
178    if (!MACH_IS_HP300)
179        return 0;
180
181        printk(KERN_INFO "Scanning for DIO devices...\n");
182
183    /* Initialize the DIO bus */
184    INIT_LIST_HEAD(&dio_bus.devices);
185    dev_set_name(&dio_bus.dev, "dio");
186    error = device_register(&dio_bus.dev);
187    if (error) {
188        pr_err("DIO: Error registering dio_bus\n");
189        return error;
190    }
191
192    /* Request all resources */
193    dio_bus.num_resources = (hp300_model == HP_320 ? 1 : 2);
194    for (i = 0; i < dio_bus.num_resources; i++)
195        request_resource(&iomem_resource, &dio_bus.resources[i]);
196
197    /* Register all devices */
198        for (scode = 0; scode < DIO_SCMAX; ++scode)
199        {
200                u_char prid, secid = 0; /* primary, secondary ID bytes */
201                u_char *va;
202        unsigned long pa;
203                
204                if (DIO_SCINHOLE(scode))
205                        continue;
206
207        pa = dio_scodetophysaddr(scode);
208
209        if (!pa)
210            continue;
211
212        if (scode < DIOII_SCBASE)
213            va = (void *)(pa + DIO_VIRADDRBASE);
214        else
215            va = ioremap(pa, PAGE_SIZE);
216
217        fs = get_fs();
218        set_fs(KERNEL_DS);
219
220                if (get_user(i, (unsigned char *)va + DIO_IDOFF)) {
221            set_fs(fs);
222            if (scode >= DIOII_SCBASE)
223                iounmap(va);
224                        continue; /* no board present at that select code */
225        }
226
227        set_fs(fs);
228
229                /* Found a board, allocate it an entry in the list */
230        dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL);
231        if (!dev)
232            return 0;
233
234        dev->bus = &dio_bus;
235        dev->dev.parent = &dio_bus.dev;
236        dev->dev.bus = &dio_bus_type;
237        dev->scode = scode;
238        dev->resource.start = pa;
239        dev->resource.end = pa + DIO_SIZE(scode, va);
240        dev_set_name(&dev->dev, "%02x", scode);
241
242                /* read the ID byte(s) and encode if necessary. */
243        prid = DIO_ID(va);
244
245                if (DIO_NEEDSSECID(prid)) {
246                        secid = DIO_SECID(va);
247                        dev->id = DIO_ENCODE_ID(prid, secid);
248                } else
249                        dev->id = prid;
250
251                dev->ipl = DIO_IPL(va);
252                strcpy(dev->name,dio_getname(dev->id));
253                printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid);
254                if (DIO_NEEDSSECID(prid))
255                        printk(":%02X", secid);
256                printk(": %s\n", dev->name);
257
258        if (scode >= DIOII_SCBASE)
259            iounmap(va);
260        error = device_register(&dev->dev);
261        if (error) {
262            pr_err("DIO: Error registering device %s\n",
263                   dev->name);
264            continue;
265        }
266        error = dio_create_sysfs_dev_files(dev);
267        if (error)
268            dev_err(&dev->dev, "Error creating sysfs files\n");
269        }
270    return 0;
271}
272
273subsys_initcall(dio_init);
274
275/* Bear in mind that this is called in the very early stages of initialisation
276 * in order to get the address of the serial port for the console...
277 */
278unsigned long dio_scodetophysaddr(int scode)
279{
280        if (scode >= DIOII_SCBASE) {
281                return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE);
282        } else if (scode > DIO_SCMAX || scode < 0)
283                return 0;
284        else if (DIO_SCINHOLE(scode))
285                return 0;
286
287        return (DIO_BASE + scode * DIO_DEVSIZE);
288}
289

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