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1// SPDX-License-Identifier: GPL-2.02/* Code to support devices on the DIO and DIO-II bus3 * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>4 * Copyright (C) 2004 Jochen Friedrich <jochen@scram.de>5 *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 code9 * 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 as12 * 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 function18 * returns it, whatever it is.19 * const char *dio_scodetoname(int scode)20 * Return a character string describing this board [might be "" if21 * not CONFIG_DIO_CONSTANTS]22 * void dio_config_board(int scode) mark board as configured in the list23 * void dio_unconfig_board(int scode) mark board as no longer configured24 *25 * This file is based on the way the Amiga port handles Zorro II cards,26 * although we aren't so complicated...27 */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 <linux/io.h> /* readb() */37 38struct dio_bus dio_bus = {39 .resources = {40 /* DIO range */41 { .name = "DIO mem", .start = 0x00600000, .end = 0x007fffff },42 /* DIO-II range */43 { .name = "DIO-II mem", .start = 0x01000000, .end = 0x1fffffff }44 },45 .name = "DIO bus"46};47 48/* not a real config option yet! */49#define CONFIG_DIO_CONSTANTS50 51#ifdef CONFIG_DIO_CONSTANTS52/* We associate each numeric ID with an appropriate descriptive string53 * using a constant array of these structs.54 * FIXME: we should be able to arrange to throw away most of the strings55 * using the initdata stuff. Then we wouldn't need to worry about56 * carrying them around...57 * I think we do this by copying them into newly kmalloc()ed memory and58 * marking the names[] array as .initdata ?59 */60struct dioname {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 DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM),71 DIONAME(DCM), DIONAME(DCMREM),72 DIONAME(LAN),73 DIONAME(FHPIB), DIONAME(NHPIB),74 DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3),75 DIONAME(FBUFFER),76 DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM),77 DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3),78 DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7),79 DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11),80 DIONAME(MISC12), DIONAME(MISC13),81 DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE),82 DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE),83 DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION),84 DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS)85};86 87#undef DIONAME88#undef DIOFBNAME89 90static const char unknowndioname[]91 = "unknown DIO board, please email linux-m68k@lists.linux-m68k.org";92 93static const char *dio_getname(int id)94{95 /* return pointer to a constant string describing the board with given ID */96 unsigned int i;97 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#else106 107static char dio_no_name[] = { 0 };108#define dio_getname(_id) (dio_no_name)109 110#endif /* CONFIG_DIO_CONSTANTS */111 112static void dio_dev_release(struct device *dev)113{114 struct dio_dev *ddev = container_of(dev, typeof(struct dio_dev), dev);115 kfree(ddev);116}117 118int __init dio_find(int deviceid)119{120 /* Called to find a DIO device before the full bus scan has run.121 * Only used by the console driver.122 */123 int scode, id;124 u_char prid, secid, i;125 126 for (scode = 0; scode < DIO_SCMAX; scode++) {127 void *va;128 unsigned long pa;129 130 if (DIO_SCINHOLE(scode))131 continue;132 133 pa = dio_scodetophysaddr(scode);134 135 if (!pa)136 continue;137 138 if (scode < DIOII_SCBASE)139 va = (void *)(pa + DIO_VIRADDRBASE);140 else141 va = ioremap(pa, PAGE_SIZE);142 143 if (copy_from_kernel_nofault(&i,144 (unsigned char *)va + DIO_IDOFF, 1)) {145 if (scode >= DIOII_SCBASE)146 iounmap(va);147 continue; /* no board present at that select code */148 }149 150 prid = DIO_ID(va);151 152 if (DIO_NEEDSSECID(prid)) {153 secid = DIO_SECID(va);154 id = DIO_ENCODE_ID(prid, secid);155 } else156 id = prid;157 158 if (id == deviceid) {159 if (scode >= DIOII_SCBASE)160 iounmap(va);161 return scode;162 }163 }164 165 return -1;166}167 168/* This is the function that scans the DIO space and works out what169 * hardware is actually present.170 */171static int __init dio_init(void)172{173 int scode;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 u_char prid, secid = 0; /* primary, secondary ID bytes */200 u_char *va;201 unsigned long pa;202 203 if (DIO_SCINHOLE(scode))204 continue;205 206 pa = dio_scodetophysaddr(scode);207 208 if (!pa)209 continue;210 211 if (scode < DIOII_SCBASE)212 va = (void *)(pa + DIO_VIRADDRBASE);213 else214 va = ioremap(pa, PAGE_SIZE);215 216 if (copy_from_kernel_nofault(&i,217 (unsigned char *)va + DIO_IDOFF, 1)) {218 if (scode >= DIOII_SCBASE)219 iounmap(va);220 continue; /* no board present at that select code */221 }222 223 /* Found a board, allocate it an entry in the list */224 dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL);225 if (!dev) {226 if (scode >= DIOII_SCBASE)227 iounmap(va);228 return -ENOMEM;229 }230 231 dev->bus = &dio_bus;232 dev->dev.parent = &dio_bus.dev;233 dev->dev.bus = &dio_bus_type;234 dev->dev.release = dio_dev_release;235 dev->scode = scode;236 dev->resource.start = pa;237 dev->resource.end = pa + DIO_SIZE(scode, va);238 dev_set_name(&dev->dev, "%02x", scode);239 240 /* read the ID byte(s) and encode if necessary. */241 prid = DIO_ID(va);242 243 if (DIO_NEEDSSECID(prid)) {244 secid = DIO_SECID(va);245 dev->id = DIO_ENCODE_ID(prid, secid);246 } else247 dev->id = prid;248 249 dev->ipl = DIO_IPL(va);250 strcpy(dev->name, dio_getname(dev->id));251 printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid);252 if (DIO_NEEDSSECID(prid))253 printk(":%02X", secid);254 printk(": %s\n", dev->name);255 256 if (scode >= DIOII_SCBASE)257 iounmap(va);258 error = device_register(&dev->dev);259 if (error) {260 pr_err("DIO: Error registering device %s\n",261 dev->name);262 put_device(&dev->dev);263 continue;264 }265 error = dio_create_sysfs_dev_files(dev);266 if (error)267 dev_err(&dev->dev, "Error creating sysfs files\n");268 }269 return 0;270}271 272subsys_initcall(dio_init);273 274/* Bear in mind that this is called in the very early stages of initialisation275 * in order to get the address of the serial port for the console...276 */277unsigned long dio_scodetophysaddr(int scode)278{279 if (scode >= DIOII_SCBASE)280 return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE);281 else if (scode > DIO_SCMAX || scode < 0)282 return 0;283 else if (DIO_SCINHOLE(scode))284 return 0;285 286 return (DIO_BASE + scode * DIO_DEVSIZE);287}288