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> 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 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 24 * 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 <asm/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_CONSTANTS 50 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 ? 59 */ 60struct dioname 61{ 62 int id; 63 const char *name; 64}; 65 66/* useful macro */ 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 } 69 70static struct dioname names[] = 71{ 72 DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM), 73 DIONAME(DCM), DIONAME(DCMREM), 74 DIONAME(LAN), 75 DIONAME(FHPIB), DIONAME(NHPIB), 76 DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3), 77 DIONAME(FBUFFER), 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) 87}; 88 89#undef DIONAME 90#undef DIOFBNAME 91 92static const char unknowndioname[] 93 = "unknown DIO board, please email linux-m68k@lists.linux-m68k.org"; 94 95static const char *dio_getname(int id) 96{ 97 /* return pointer to a constant string describing the board with given ID */ 98 unsigned int i; 99 for (i = 0; i < ARRAY_SIZE(names); i++) 100 if (names[i].id == id) 101 return names[i].name; 102 103 return unknowndioname; 104} 105 106#else 107 108static char dio_no_name[] = { 0 }; 109#define dio_getname(_id) (dio_no_name) 110 111#endif /* CONFIG_DIO_CONSTANTS */ 112 113static void dio_dev_release(struct device *dev) 114{ 115 struct dio_dev *ddev = container_of(dev, typeof(struct dio_dev), dev); 116 kfree(ddev); 117} 118 119int __init dio_find(int deviceid) 120{ 121 /* Called to find a DIO device before the full bus scan has run. 122 * Only used by the console driver. 123 */ 124 int scode, id; 125 u_char prid, secid, i; 126 127 for (scode = 0; scode < DIO_SCMAX; scode++) { 128 void *va; 129 unsigned long pa; 130 131 if (DIO_SCINHOLE(scode)) 132 continue; 133 134 pa = dio_scodetophysaddr(scode); 135 136 if (!pa) 137 continue; 138 139 if (scode < DIOII_SCBASE) 140 va = (void *)(pa + DIO_VIRADDRBASE); 141 else 142 va = ioremap(pa, PAGE_SIZE); 143 144 if (copy_from_kernel_nofault(&i, 145 (unsigned char *)va + DIO_IDOFF, 1)) { 146 if (scode >= DIOII_SCBASE) 147 iounmap(va); 148 continue; /* no board present at that select code */ 149 } 150 151 prid = DIO_ID(va); 152 153 if (DIO_NEEDSSECID(prid)) { 154 secid = DIO_SECID(va); 155 id = DIO_ENCODE_ID(prid, secid); 156 } else 157 id = prid; 158 159 if (id == deviceid) { 160 if (scode >= DIOII_SCBASE) 161 iounmap(va); 162 return scode; 163 } 164 } 165 166 return -1; 167} 168 169/* This is the function that scans the DIO space and works out what 170 * hardware is actually present. 171 */ 172static int __init dio_init(void) 173{ 174 int scode; 175 int i; 176 struct dio_dev *dev; 177 int error; 178 179 if (!MACH_IS_HP300) 180 return 0; 181 182 printk(KERN_INFO "Scanning for DIO devices...\n"); 183 184 /* Initialize the DIO bus */ 185 INIT_LIST_HEAD(&dio_bus.devices); 186 dev_set_name(&dio_bus.dev, "dio"); 187 error = device_register(&dio_bus.dev); 188 if (error) { 189 pr_err("DIO: Error registering dio_bus\n"); 190 return error; 191 } 192 193 /* Request all resources */ 194 dio_bus.num_resources = (hp300_model == HP_320 ? 1 : 2); 195 for (i = 0; i < dio_bus.num_resources; i++) 196 request_resource(&iomem_resource, &dio_bus.resources[i]); 197 198 /* Register all devices */ 199 for (scode = 0; scode < DIO_SCMAX; ++scode) 200 { 201 u_char prid, secid = 0; /* primary, secondary ID bytes */ 202 u_char *va; 203 unsigned long pa; 204 205 if (DIO_SCINHOLE(scode)) 206 continue; 207 208 pa = dio_scodetophysaddr(scode); 209 210 if (!pa) 211 continue; 212 213 if (scode < DIOII_SCBASE) 214 va = (void *)(pa + DIO_VIRADDRBASE); 215 else 216 va = ioremap(pa, PAGE_SIZE); 217 218 if (copy_from_kernel_nofault(&i, 219 (unsigned char *)va + DIO_IDOFF, 1)) { 220 if (scode >= DIOII_SCBASE) 221 iounmap(va); 222 continue; /* no board present at that select code */ 223 } 224 225 /* Found a board, allocate it an entry in the list */ 226 dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL); 227 if (!dev) 228 return 0; 229 230 dev->bus = &dio_bus; 231 dev->dev.parent = &dio_bus.dev; 232 dev->dev.bus = &dio_bus_type; 233 dev->dev.release = dio_dev_release; 234 dev->scode = scode; 235 dev->resource.start = pa; 236 dev->resource.end = pa + DIO_SIZE(scode, va); 237 dev_set_name(&dev->dev, "%02x", scode); 238 239 /* read the ID byte(s) and encode if necessary. */ 240 prid = DIO_ID(va); 241 242 if (DIO_NEEDSSECID(prid)) { 243 secid = DIO_SECID(va); 244 dev->id = DIO_ENCODE_ID(prid, secid); 245 } else 246 dev->id = prid; 247 248 dev->ipl = DIO_IPL(va); 249 strcpy(dev->name,dio_getname(dev->id)); 250 printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid); 251 if (DIO_NEEDSSECID(prid)) 252 printk(":%02X", secid); 253 printk(": %s\n", dev->name); 254 255 if (scode >= DIOII_SCBASE) 256 iounmap(va); 257 error = device_register(&dev->dev); 258 if (error) { 259 pr_err("DIO: Error registering device %s\n", 260 dev->name); 261 put_device(&dev->dev); 262 continue; 263 } 264 error = dio_create_sysfs_dev_files(dev); 265 if (error) 266 dev_err(&dev->dev, "Error creating sysfs files\n"); 267 } 268 return 0; 269} 270 271subsys_initcall(dio_init); 272 273/* Bear in mind that this is called in the very early stages of initialisation 274 * in order to get the address of the serial port for the console... 275 */ 276unsigned long dio_scodetophysaddr(int scode) 277{ 278 if (scode >= DIOII_SCBASE) { 279 return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE); 280 } else if (scode > DIO_SCMAX || scode < 0) 281 return 0; 282 else if (DIO_SCINHOLE(scode)) 283 return 0; 284 285 return (DIO_BASE + scode * DIO_DEVSIZE); 286} 287