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 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 106 107 static char dio_no_name[] = { 0 }; 108 #define dio_getname(_id) (dio_no_name) 109 110 #endif /* CONFIG_DIO_CONSTANTS */ 111 112 static 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 } 117 118 int __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 else 141 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 } else 156 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 what 169 * hardware is actually present. 170 */ 171 static 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 else 214 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 } else 247 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 } 271 272 subsys_initcall(dio_init); 273 274 /* Bear in mind that this is called in the very early stages of initialisation 275 * in order to get the address of the serial port for the console... 276 */ 277 unsigned 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