1 // SPDX-License-Identifier: GPL-2.0
2 /* Code to support devices on the DIO and DIO-II bus
3 * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
4 * Copyright (C) 2004 Jochen Friedrich <jochen@scram.de>
6 * This code has basically these routines at the moment:
7 * int dio_find(u_int deviceid)
8 * Search the list of DIO devices and return the select code
9 * of the next unconfigured device found that matches the given device ID.
10 * Note that the deviceid parameter should be the encoded ID.
11 * This means that framebuffers should pass it as
12 * DIO_ENCODE_ID(DIO_ID_FBUFFER,DIO_ID2_TOPCAT)
13 * (or whatever); everybody else just uses DIO_ID_FOOBAR.
14 * unsigned long dio_scodetophysaddr(int scode)
15 * Return the physical address corresponding to the given select code.
16 * int dio_scodetoipl(int scode)
17 * Every DIO card has a fixed interrupt priority level. This function
18 * returns it, whatever it is.
19 * const char *dio_scodetoname(int scode)
20 * Return a character string describing this board [might be "" if
21 * not CONFIG_DIO_CONSTANTS]
22 * void dio_config_board(int scode) mark board as configured in the list
23 * void dio_unconfig_board(int scode) mark board as no longer configured
25 * This file is based on the way the Amiga port handles Zorro II cards,
26 * although we aren't so complicated...
28 #include <linux/module.h>
29 #include <linux/string.h>
30 #include <linux/types.h>
31 #include <linux/kernel.h>
32 #include <linux/init.h>
33 #include <linux/dio.h>
34 #include <linux/slab.h> /* kmalloc() */
35 #include <linux/uaccess.h>
36 #include <asm/io.h> /* readb() */
38 struct dio_bus dio_bus = {
41 { .name = "DIO mem", .start = 0x00600000, .end = 0x007fffff },
43 { .name = "DIO-II mem", .start = 0x01000000, .end = 0x1fffffff }
48 /* not a real config option yet! */
49 #define CONFIG_DIO_CONSTANTS
51 #ifdef CONFIG_DIO_CONSTANTS
52 /* We associate each numeric ID with an appropriate descriptive string
53 * using a constant array of these structs.
54 * FIXME: we should be able to arrange to throw away most of the strings
55 * using the initdata stuff. Then we wouldn't need to worry about
56 * carrying them around...
57 * I think we do this by copying them into newly kmalloc()ed memory and
58 * marking the names[] array as .initdata ?
67 #define DIONAME(x) { DIO_ID_##x, DIO_DESC_##x }
68 #define DIOFBNAME(x) { DIO_ENCODE_ID( DIO_ID_FBUFFER, DIO_ID2_##x), DIO_DESC2_##x }
70 static struct dioname names[] =
72 DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM),
73 DIONAME(DCM), DIONAME(DCMREM),
75 DIONAME(FHPIB), DIONAME(NHPIB),
76 DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3),
78 DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM),
79 DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3),
80 DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7),
81 DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11),
82 DIONAME(MISC12), DIONAME(MISC13),
83 DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE),
84 DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE),
85 DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION),
86 DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS)
92 static const char unknowndioname[]
93 = "unknown DIO board, please email linux-m68k@lists.linux-m68k.org";
95 static const char *dio_getname(int id)
97 /* return pointer to a constant string describing the board with given ID */
99 for (i = 0; i < ARRAY_SIZE(names); i++)
100 if (names[i].id == id)
101 return names[i].name;
103 return unknowndioname;
108 static char dio_no_name[] = { 0 };
109 #define dio_getname(_id) (dio_no_name)
111 #endif /* CONFIG_DIO_CONSTANTS */
113 int __init dio_find(int deviceid)
115 /* Called to find a DIO device before the full bus scan has run.
116 * Only used by the console driver.
119 u_char prid, secid, i;
121 for (scode = 0; scode < DIO_SCMAX; scode++) {
125 if (DIO_SCINHOLE(scode))
128 pa = dio_scodetophysaddr(scode);
133 if (scode < DIOII_SCBASE)
134 va = (void *)(pa + DIO_VIRADDRBASE);
136 va = ioremap(pa, PAGE_SIZE);
138 if (probe_kernel_read(&i, (unsigned char *)va + DIO_IDOFF, 1)) {
139 if (scode >= DIOII_SCBASE)
141 continue; /* no board present at that select code */
146 if (DIO_NEEDSSECID(prid)) {
147 secid = DIO_SECID(va);
148 id = DIO_ENCODE_ID(prid, secid);
152 if (id == deviceid) {
153 if (scode >= DIOII_SCBASE)
162 /* This is the function that scans the DIO space and works out what
163 * hardware is actually present.
165 static int __init dio_init(void)
175 printk(KERN_INFO "Scanning for DIO devices...\n");
177 /* Initialize the DIO bus */
178 INIT_LIST_HEAD(&dio_bus.devices);
179 dev_set_name(&dio_bus.dev, "dio");
180 error = device_register(&dio_bus.dev);
182 pr_err("DIO: Error registering dio_bus\n");
186 /* Request all resources */
187 dio_bus.num_resources = (hp300_model == HP_320 ? 1 : 2);
188 for (i = 0; i < dio_bus.num_resources; i++)
189 request_resource(&iomem_resource, &dio_bus.resources[i]);
191 /* Register all devices */
192 for (scode = 0; scode < DIO_SCMAX; ++scode)
194 u_char prid, secid = 0; /* primary, secondary ID bytes */
198 if (DIO_SCINHOLE(scode))
201 pa = dio_scodetophysaddr(scode);
206 if (scode < DIOII_SCBASE)
207 va = (void *)(pa + DIO_VIRADDRBASE);
209 va = ioremap(pa, PAGE_SIZE);
211 if (probe_kernel_read(&i, (unsigned char *)va + DIO_IDOFF, 1)) {
212 if (scode >= DIOII_SCBASE)
214 continue; /* no board present at that select code */
217 /* Found a board, allocate it an entry in the list */
218 dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL);
223 dev->dev.parent = &dio_bus.dev;
224 dev->dev.bus = &dio_bus_type;
226 dev->resource.start = pa;
227 dev->resource.end = pa + DIO_SIZE(scode, va);
228 dev_set_name(&dev->dev, "%02x", scode);
230 /* read the ID byte(s) and encode if necessary. */
233 if (DIO_NEEDSSECID(prid)) {
234 secid = DIO_SECID(va);
235 dev->id = DIO_ENCODE_ID(prid, secid);
239 dev->ipl = DIO_IPL(va);
240 strcpy(dev->name,dio_getname(dev->id));
241 printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid);
242 if (DIO_NEEDSSECID(prid))
243 printk(":%02X", secid);
244 printk(": %s\n", dev->name);
246 if (scode >= DIOII_SCBASE)
248 error = device_register(&dev->dev);
250 pr_err("DIO: Error registering device %s\n",
254 error = dio_create_sysfs_dev_files(dev);
256 dev_err(&dev->dev, "Error creating sysfs files\n");
261 subsys_initcall(dio_init);
263 /* Bear in mind that this is called in the very early stages of initialisation
264 * in order to get the address of the serial port for the console...
266 unsigned long dio_scodetophysaddr(int scode)
268 if (scode >= DIOII_SCBASE) {
269 return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE);
270 } else if (scode > DIO_SCMAX || scode < 0)
272 else if (DIO_SCINHOLE(scode))
275 return (DIO_BASE + scode * DIO_DEVSIZE);