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 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 { 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 70 static 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 92 static const char *unknowndioname 93 = "unknown DIO board -- please email <linux-m68k@lists.linux-m68k.org>!"; 94 95 static 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 107 108 static char dio_no_name[] = { 0 }; 109 #define dio_getname(_id) (dio_no_name) 110 111 #endif /* CONFIG_DIO_CONSTANTS */ 112 113 int __init dio_find(int deviceid) 114 { 115 /* Called to find a DIO device before the full bus scan has run. 116 * Only used by the console driver. 117 */ 118 int scode, id; 119 u_char prid, secid, i; 120 121 for (scode = 0; scode < DIO_SCMAX; scode++) { 122 void *va; 123 unsigned long pa; 124 125 if (DIO_SCINHOLE(scode)) 126 continue; 127 128 pa = dio_scodetophysaddr(scode); 129 130 if (!pa) 131 continue; 132 133 if (scode < DIOII_SCBASE) 134 va = (void *)(pa + DIO_VIRADDRBASE); 135 else 136 va = ioremap(pa, PAGE_SIZE); 137 138 if (probe_kernel_read(&i, (unsigned char *)va + DIO_IDOFF, 1)) { 139 if (scode >= DIOII_SCBASE) 140 iounmap(va); 141 continue; /* no board present at that select code */ 142 } 143 144 prid = DIO_ID(va); 145 146 if (DIO_NEEDSSECID(prid)) { 147 secid = DIO_SECID(va); 148 id = DIO_ENCODE_ID(prid, secid); 149 } else 150 id = prid; 151 152 if (id == deviceid) { 153 if (scode >= DIOII_SCBASE) 154 iounmap(va); 155 return scode; 156 } 157 } 158 159 return -1; 160 } 161 162 /* This is the function that scans the DIO space and works out what 163 * hardware is actually present. 164 */ 165 static int __init dio_init(void) 166 { 167 int scode; 168 int i; 169 struct dio_dev *dev; 170 int error; 171 172 if (!MACH_IS_HP300) 173 return 0; 174 175 printk(KERN_INFO "Scanning for DIO devices...\n"); 176 177 /* 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); 181 if (error) { 182 pr_err("DIO: Error registering dio_bus\n"); 183 return error; 184 } 185 186 /* 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]); 190 191 /* Register all devices */ 192 for (scode = 0; scode < DIO_SCMAX; ++scode) 193 { 194 u_char prid, secid = 0; /* primary, secondary ID bytes */ 195 u_char *va; 196 unsigned long pa; 197 198 if (DIO_SCINHOLE(scode)) 199 continue; 200 201 pa = dio_scodetophysaddr(scode); 202 203 if (!pa) 204 continue; 205 206 if (scode < DIOII_SCBASE) 207 va = (void *)(pa + DIO_VIRADDRBASE); 208 else 209 va = ioremap(pa, PAGE_SIZE); 210 211 if (probe_kernel_read(&i, (unsigned char *)va + DIO_IDOFF, 1)) { 212 if (scode >= DIOII_SCBASE) 213 iounmap(va); 214 continue; /* no board present at that select code */ 215 } 216 217 /* Found a board, allocate it an entry in the list */ 218 dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL); 219 if (!dev) 220 return 0; 221 222 dev->bus = &dio_bus; 223 dev->dev.parent = &dio_bus.dev; 224 dev->dev.bus = &dio_bus_type; 225 dev->scode = scode; 226 dev->resource.start = pa; 227 dev->resource.end = pa + DIO_SIZE(scode, va); 228 dev_set_name(&dev->dev, "%02x", scode); 229 230 /* read the ID byte(s) and encode if necessary. */ 231 prid = DIO_ID(va); 232 233 if (DIO_NEEDSSECID(prid)) { 234 secid = DIO_SECID(va); 235 dev->id = DIO_ENCODE_ID(prid, secid); 236 } else 237 dev->id = prid; 238 239 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); 245 246 if (scode >= DIOII_SCBASE) 247 iounmap(va); 248 error = device_register(&dev->dev); 249 if (error) { 250 pr_err("DIO: Error registering device %s\n", 251 dev->name); 252 continue; 253 } 254 error = dio_create_sysfs_dev_files(dev); 255 if (error) 256 dev_err(&dev->dev, "Error creating sysfs files\n"); 257 } 258 return 0; 259 } 260 261 subsys_initcall(dio_init); 262 263 /* 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... 265 */ 266 unsigned long dio_scodetophysaddr(int scode) 267 { 268 if (scode >= DIOII_SCBASE) { 269 return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE); 270 } else if (scode > DIO_SCMAX || scode < 0) 271 return 0; 272 else if (DIO_SCINHOLE(scode)) 273 return 0; 274 275 return (DIO_BASE + scode * DIO_DEVSIZE); 276 } 277