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 <linux/io.h> /* readb() */ 37 38 struct 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 */ 60 struct 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 69 static 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 DIONAME 88 #undef DIOFBNAME 89 90 static const char unknowndioname[] 91 = "unknown DIO board, please email linux-m68k@lists.linux-m68k.org"; 92 93 static 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 for (i = 0; i < ARRAY_SIZE(names); i++) 98 if (names[i].id == id) 99 return names[i].name; 100 101 return unknowndioname; 102 } 103 104 #else 105 106 static char dio_no_name[] = { 0 }; 107 #define dio_getname(_id) (dio_no_name) 108 109 #endif /* CONFIG_DIO_CONSTANTS */ 110 111 int __init dio_find(int deviceid) 112 { 113 /* Called to find a DIO device before the full bus scan has run. 114 * Only used by the console driver. 115 */ 116 int scode, id; 117 u_char prid, secid, i; 118 119 for (scode = 0; scode < DIO_SCMAX; scode++) { 120 void *va; 121 unsigned long pa; 122 123 if (DIO_SCINHOLE(scode)) 124 continue; 125 126 pa = dio_scodetophysaddr(scode); 127 128 if (!pa) 129 continue; 130 131 if (scode < DIOII_SCBASE) 132 va = (void *)(pa + DIO_VIRADDRBASE); 133 else 134 va = ioremap(pa, PAGE_SIZE); 135 136 if (copy_from_kernel_nofault(&i, 137 (unsigned char *)va + DIO_IDOFF, 1)) { 138 if (scode >= DIOII_SCBASE) 139 iounmap(va); 140 continue; /* no board present at that select code */ 141 } 142 143 prid = DIO_ID(va); 144 145 if (DIO_NEEDSSECID(prid)) { 146 secid = DIO_SECID(va); 147 id = DIO_ENCODE_ID(prid, secid); 148 } else 149 id = prid; 150 151 if (id == deviceid) { 152 if (scode >= DIOII_SCBASE) 153 iounmap(va); 154 return scode; 155 } 156 } 157 158 return -1; 159 } 160 161 /* This is the function that scans the DIO space and works out what 162 * hardware is actually present. 163 */ 164 static int __init dio_init(void) 165 { 166 int scode; 167 int i; 168 struct dio_dev *dev; 169 int error; 170 171 if (!MACH_IS_HP300) 172 return 0; 173 174 printk(KERN_INFO "Scanning for DIO devices...\n"); 175 176 /* Initialize the DIO bus */ 177 INIT_LIST_HEAD(&dio_bus.devices); 178 dev_set_name(&dio_bus.dev, "dio"); 179 error = device_register(&dio_bus.dev); 180 if (error) { 181 pr_err("DIO: Error registering dio_bus\n"); 182 return error; 183 } 184 185 /* Request all resources */ 186 dio_bus.num_resources = (hp300_model == HP_320 ? 1 : 2); 187 for (i = 0; i < dio_bus.num_resources; i++) 188 request_resource(&iomem_resource, &dio_bus.resources[i]); 189 190 /* Register all devices */ 191 for (scode = 0; scode < DIO_SCMAX; ++scode) { 192 u_char prid, secid = 0; /* primary, secondary ID bytes */ 193 u_char *va; 194 unsigned long pa; 195 196 if (DIO_SCINHOLE(scode)) 197 continue; 198 199 pa = dio_scodetophysaddr(scode); 200 201 if (!pa) 202 continue; 203 204 if (scode < DIOII_SCBASE) 205 va = (void *)(pa + DIO_VIRADDRBASE); 206 else 207 va = ioremap(pa, PAGE_SIZE); 208 209 if (copy_from_kernel_nofault(&i, 210 (unsigned char *)va + DIO_IDOFF, 1)) { 211 if (scode >= DIOII_SCBASE) 212 iounmap(va); 213 continue; /* no board present at that select code */ 214 } 215 216 /* Found a board, allocate it an entry in the list */ 217 dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL); 218 if (!dev) 219 return -ENOMEM; 220 221 dev->bus = &dio_bus; 222 dev->dev.parent = &dio_bus.dev; 223 dev->dev.bus = &dio_bus_type; 224 dev->scode = scode; 225 dev->resource.start = pa; 226 dev->resource.end = pa + DIO_SIZE(scode, va); 227 dev_set_name(&dev->dev, "%02x", scode); 228 229 /* read the ID byte(s) and encode if necessary. */ 230 prid = DIO_ID(va); 231 232 if (DIO_NEEDSSECID(prid)) { 233 secid = DIO_SECID(va); 234 dev->id = DIO_ENCODE_ID(prid, secid); 235 } else 236 dev->id = prid; 237 238 dev->ipl = DIO_IPL(va); 239 strcpy(dev->name, dio_getname(dev->id)); 240 printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid); 241 if (DIO_NEEDSSECID(prid)) 242 printk(":%02X", secid); 243 printk(": %s\n", dev->name); 244 245 if (scode >= DIOII_SCBASE) 246 iounmap(va); 247 error = device_register(&dev->dev); 248 if (error) { 249 pr_err("DIO: Error registering device %s\n", 250 dev->name); 251 continue; 252 } 253 error = dio_create_sysfs_dev_files(dev); 254 if (error) 255 dev_err(&dev->dev, "Error creating sysfs files\n"); 256 } 257 return 0; 258 } 259 260 subsys_initcall(dio_init); 261 262 /* Bear in mind that this is called in the very early stages of initialisation 263 * in order to get the address of the serial port for the console... 264 */ 265 unsigned long dio_scodetophysaddr(int scode) 266 { 267 if (scode >= DIOII_SCBASE) 268 return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE); 269 else if (scode > DIO_SCMAX || scode < 0) 270 return 0; 271 else if (DIO_SCINHOLE(scode)) 272 return 0; 273 274 return (DIO_BASE + scode * DIO_DEVSIZE); 275 } 276