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 37struct 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 51struct dioname 52{ 53 int id; 54 const char *name; 55}; 56 57/* useful macro */ 58#define DIONAME(x) { DIO_ID_##x, DIO_DESC_##x } 59#define DIOFBNAME(x) { DIO_ENCODE_ID( DIO_ID_FBUFFER, DIO_ID2_##x), DIO_DESC2_##x } 60 61static struct dioname names[] = 62{ 63 DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM), 64 DIONAME(DCM), DIONAME(DCMREM), 65 DIONAME(LAN), 66 DIONAME(FHPIB), DIONAME(NHPIB), 67 DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3), 68 DIONAME(FBUFFER), 69 DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM), 70 DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3), 71 DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7), 72 DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11), 73 DIONAME(MISC12), DIONAME(MISC13), 74 DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE), 75 DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE), 76 DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION), 77 DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS) 78}; 79 80#undef DIONAME 81#undef DIOFBNAME 82 83#define NUMNAMES (sizeof(names) / sizeof(struct dioname)) 84 85static const char *unknowndioname 86 = "unknown DIO board -- please email <linux-m68k@lists.linux-m68k.org>!"; 87 88static const char *dio_getname(int id) 89{ 90 /* return pointer to a constant string describing the board with given ID */ 91 unsigned int i; 92 for (i = 0; i < NUMNAMES; i++) 93 if (names[i].id == id) 94 return names[i].name; 95 96 return unknowndioname; 97} 98 99#else 100 101static char dio_no_name[] = { 0 }; 102#define dio_getname(_id) (dio_no_name) 103 104#endif /* CONFIG_DIO_CONSTANTS */ 105 106int __init dio_find(int deviceid) 107{ 108 /* Called to find a DIO device before the full bus scan has run. 109 * Only used by the console driver. 110 */ 111 int scode, id; 112 u_char prid, secid, i; 113 mm_segment_t fs; 114 115 for (scode = 0; scode < DIO_SCMAX; scode++) { 116 void *va; 117 unsigned long pa; 118 119 if (DIO_SCINHOLE(scode)) 120 continue; 121 122 pa = dio_scodetophysaddr(scode); 123 124 if (!pa) 125 continue; 126 127 if (scode < DIOII_SCBASE) 128 va = (void *)(pa + DIO_VIRADDRBASE); 129 else 130 va = ioremap(pa, PAGE_SIZE); 131 132 fs = get_fs(); 133 set_fs(KERNEL_DS); 134 135 if (get_user(i, (unsigned char *)va + DIO_IDOFF)) { 136 set_fs(fs); 137 if (scode >= DIOII_SCBASE) 138 iounmap(va); 139 continue; /* no board present at that select code */ 140 } 141 142 set_fs(fs); 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 */ 164static int __init dio_init(void) 165{ 166 int scode; 167 mm_segment_t fs; 168 int i; 169 struct dio_dev *dev; 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 strcpy(dio_bus.dev.bus_id, "dio"); 179 device_register(&dio_bus.dev); 180 181 /* Request all resources */ 182 dio_bus.num_resources = (hp300_model == HP_320 ? 1 : 2); 183 for (i = 0; i < dio_bus.num_resources; i++) 184 request_resource(&iomem_resource, &dio_bus.resources[i]); 185 186 /* Register all devices */ 187 for (scode = 0; scode < DIO_SCMAX; ++scode) 188 { 189 u_char prid, secid = 0; /* primary, secondary ID bytes */ 190 u_char *va; 191 unsigned long pa; 192 193 if (DIO_SCINHOLE(scode)) 194 continue; 195 196 pa = dio_scodetophysaddr(scode); 197 198 if (!pa) 199 continue; 200 201 if (scode < DIOII_SCBASE) 202 va = (void *)(pa + DIO_VIRADDRBASE); 203 else 204 va = ioremap(pa, PAGE_SIZE); 205 206 fs = get_fs(); 207 set_fs(KERNEL_DS); 208 209 if (get_user(i, (unsigned char *)va + DIO_IDOFF)) { 210 set_fs(fs); 211 if (scode >= DIOII_SCBASE) 212 iounmap(va); 213 continue; /* no board present at that select code */ 214 } 215 216 set_fs(fs); 217 218 /* Found a board, allocate it an entry in the list */ 219 dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL); 220 if (!dev) 221 return 0; 222 223 dev->bus = &dio_bus; 224 dev->dev.parent = &dio_bus.dev; 225 dev->dev.bus = &dio_bus_type; 226 dev->scode = scode; 227 dev->resource.start = pa; 228 dev->resource.end = pa + DIO_SIZE(scode, va); 229 sprintf(dev->dev.bus_id,"%02x", scode); 230 231 /* read the ID byte(s) and encode if necessary. */ 232 prid = DIO_ID(va); 233 234 if (DIO_NEEDSSECID(prid)) { 235 secid = DIO_SECID(va); 236 dev->id = DIO_ENCODE_ID(prid, secid); 237 } else 238 dev->id = prid; 239 240 dev->ipl = DIO_IPL(va); 241 strcpy(dev->name,dio_getname(dev->id)); 242 printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid); 243 if (DIO_NEEDSSECID(prid)) 244 printk(":%02X", secid); 245 printk(": %s\n", dev->name); 246 247 if (scode >= DIOII_SCBASE) 248 iounmap(va); 249 device_register(&dev->dev); 250 dio_create_sysfs_dev_files(dev); 251 } 252 return 0; 253} 254 255subsys_initcall(dio_init); 256 257/* Bear in mind that this is called in the very early stages of initialisation 258 * in order to get the address of the serial port for the console... 259 */ 260unsigned long dio_scodetophysaddr(int scode) 261{ 262 if (scode >= DIOII_SCBASE) { 263 return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE); 264 } else if (scode > DIO_SCMAX || scode < 0) 265 return 0; 266 else if (DIO_SCINHOLE(scode)) 267 return 0; 268 269 return (DIO_BASE + scode * DIO_DEVSIZE); 270} 271