1 /* Code to support devices on the DIO and DIO-II bus 2 * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk> 3 * Copyright (C) 2004 Jochen Friedrich <jochen@scram.de> 4 * 5 * This code has basically these routines at the moment: 6 * int dio_find(u_int deviceid) 7 * Search the list of DIO devices and return the select code 8 * of the next unconfigured device found that matches the given device ID. 9 * Note that the deviceid parameter should be the encoded ID. 10 * This means that framebuffers should pass it as 11 * DIO_ENCODE_ID(DIO_ID_FBUFFER,DIO_ID2_TOPCAT) 12 * (or whatever); everybody else just uses DIO_ID_FOOBAR. 13 * unsigned long dio_scodetophysaddr(int scode) 14 * Return the physical address corresponding to the given select code. 15 * int dio_scodetoipl(int scode) 16 * Every DIO card has a fixed interrupt priority level. This function 17 * returns it, whatever it is. 18 * const char *dio_scodetoname(int scode) 19 * Return a character string describing this board [might be "" if 20 * not CONFIG_DIO_CONSTANTS] 21 * void dio_config_board(int scode) mark board as configured in the list 22 * void dio_unconfig_board(int scode) mark board as no longer configured 23 * 24 * This file is based on the way the Amiga port handles Zorro II cards, 25 * although we aren't so complicated... 26 */ 27 #include <linux/module.h> 28 #include <linux/string.h> 29 #include <linux/types.h> 30 #include <linux/kernel.h> 31 #include <linux/init.h> 32 #include <linux/dio.h> 33 #include <linux/slab.h> /* kmalloc() */ 34 #include <asm/uaccess.h> 35 #include <asm/io.h> /* readb() */ 36 37 struct dio_bus dio_bus = { 38 .resources = { 39 /* DIO range */ 40 { .name = "DIO mem", .start = 0x00600000, .end = 0x007fffff }, 41 /* DIO-II range */ 42 { .name = "DIO-II mem", .start = 0x01000000, .end = 0x1fffffff } 43 }, 44 .name = "DIO bus" 45 }; 46 47 /* not a real config option yet! */ 48 #define CONFIG_DIO_CONSTANTS 49 50 #ifdef CONFIG_DIO_CONSTANTS 51 /* We associate each numeric ID with an appropriate descriptive string 52 * using a constant array of these structs. 53 * FIXME: we should be able to arrange to throw away most of the strings 54 * using the initdata stuff. Then we wouldn't need to worry about 55 * carrying them around... 56 * I think we do this by copying them into newly kmalloc()ed memory and 57 * marking the names[] array as .initdata ? 58 */ 59 struct dioname 60 { 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 { 71 DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM), 72 DIONAME(DCM), DIONAME(DCMREM), 73 DIONAME(LAN), 74 DIONAME(FHPIB), DIONAME(NHPIB), 75 DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3), 76 DIONAME(FBUFFER), 77 DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM), 78 DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3), 79 DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7), 80 DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11), 81 DIONAME(MISC12), DIONAME(MISC13), 82 DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE), 83 DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE), 84 DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION), 85 DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS) 86 }; 87 88 #undef DIONAME 89 #undef DIOFBNAME 90 91 static const char *unknowndioname 92 = "unknown DIO board -- please email <linux-m68k@lists.linux-m68k.org>!"; 93 94 static const char *dio_getname(int id) 95 { 96 /* return pointer to a constant string describing the board with given ID */ 97 unsigned int i; 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 int __init dio_find(int deviceid) 113 { 114 /* Called to find a DIO device before the full bus scan has run. 115 * Only used by the console driver. 116 */ 117 int scode, id; 118 u_char prid, secid, i; 119 mm_segment_t fs; 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 fs = get_fs(); 139 set_fs(KERNEL_DS); 140 141 if (get_user(i, (unsigned char *)va + DIO_IDOFF)) { 142 set_fs(fs); 143 if (scode >= DIOII_SCBASE) 144 iounmap(va); 145 continue; /* no board present at that select code */ 146 } 147 148 set_fs(fs); 149 prid = DIO_ID(va); 150 151 if (DIO_NEEDSSECID(prid)) { 152 secid = DIO_SECID(va); 153 id = DIO_ENCODE_ID(prid, secid); 154 } else 155 id = prid; 156 157 if (id == deviceid) { 158 if (scode >= DIOII_SCBASE) 159 iounmap(va); 160 return scode; 161 } 162 } 163 164 return -1; 165 } 166 167 /* This is the function that scans the DIO space and works out what 168 * hardware is actually present. 169 */ 170 static int __init dio_init(void) 171 { 172 int scode; 173 mm_segment_t fs; 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 { 200 u_char prid, secid = 0; /* primary, secondary ID bytes */ 201 u_char *va; 202 unsigned long pa; 203 204 if (DIO_SCINHOLE(scode)) 205 continue; 206 207 pa = dio_scodetophysaddr(scode); 208 209 if (!pa) 210 continue; 211 212 if (scode < DIOII_SCBASE) 213 va = (void *)(pa + DIO_VIRADDRBASE); 214 else 215 va = ioremap(pa, PAGE_SIZE); 216 217 fs = get_fs(); 218 set_fs(KERNEL_DS); 219 220 if (get_user(i, (unsigned char *)va + DIO_IDOFF)) { 221 set_fs(fs); 222 if (scode >= DIOII_SCBASE) 223 iounmap(va); 224 continue; /* no board present at that select code */ 225 } 226 227 set_fs(fs); 228 229 /* Found a board, allocate it an entry in the list */ 230 dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL); 231 if (!dev) 232 return 0; 233 234 dev->bus = &dio_bus; 235 dev->dev.parent = &dio_bus.dev; 236 dev->dev.bus = &dio_bus_type; 237 dev->scode = scode; 238 dev->resource.start = pa; 239 dev->resource.end = pa + DIO_SIZE(scode, va); 240 dev_set_name(&dev->dev, "%02x", scode); 241 242 /* read the ID byte(s) and encode if necessary. */ 243 prid = DIO_ID(va); 244 245 if (DIO_NEEDSSECID(prid)) { 246 secid = DIO_SECID(va); 247 dev->id = DIO_ENCODE_ID(prid, secid); 248 } else 249 dev->id = prid; 250 251 dev->ipl = DIO_IPL(va); 252 strcpy(dev->name,dio_getname(dev->id)); 253 printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid); 254 if (DIO_NEEDSSECID(prid)) 255 printk(":%02X", secid); 256 printk(": %s\n", dev->name); 257 258 if (scode >= DIOII_SCBASE) 259 iounmap(va); 260 error = device_register(&dev->dev); 261 if (error) { 262 pr_err("DIO: Error registering device %s\n", 263 dev->name); 264 continue; 265 } 266 error = dio_create_sysfs_dev_files(dev); 267 if (error) 268 dev_err(&dev->dev, "Error creating sysfs files\n"); 269 } 270 return 0; 271 } 272 273 subsys_initcall(dio_init); 274 275 /* Bear in mind that this is called in the very early stages of initialisation 276 * in order to get the address of the serial port for the console... 277 */ 278 unsigned long dio_scodetophysaddr(int scode) 279 { 280 if (scode >= DIOII_SCBASE) { 281 return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE); 282 } else if (scode > DIO_SCMAX || scode < 0) 283 return 0; 284 else if (DIO_SCINHOLE(scode)) 285 return 0; 286 287 return (DIO_BASE + scode * DIO_DEVSIZE); 288 } 289