/* Code to support devices on the DIO (and eventually DIO-II) bus * Copyright (C) 05/1998 Peter Maydell * * This code has basically these routines at the moment: * int dio_find(u_int deviceid) * Search the list of DIO devices and return the select code * of the next unconfigured device found that matches the given device ID. * Note that the deviceid parameter should be the encoded ID. * This means that framebuffers should pass it as * DIO_ENCODE_ID(DIO_ID_FBUFFER,DIO_ID2_TOPCAT) * (or whatever); everybody else just uses DIO_ID_FOOBAR. * void *dio_scodetoviraddr(int scode) * Return the virtual address corresponding to the given select code. * NB: DIO-II devices will have to be mapped in in this routine! * int dio_scodetoipl(int scode) * Every DIO card has a fixed interrupt priority level. This function * returns it, whatever it is. * const char *dio_scodetoname(int scode) * Return a character string describing this board [might be "" if * not CONFIG_DIO_CONSTANTS] * void dio_config_board(int scode) mark board as configured in the list * void dio_unconfig_board(int scode) mark board as no longer configured * * This file is based on the way the Amiga port handles Zorro II cards, * although we aren't so complicated... */ #include #include #include #include #include /* kmalloc() */ #include #include /* hwreg_present() */ #include /* not a real config option yet! */ #define CONFIG_DIO_CONSTANTS #ifdef CONFIG_DIO_CONSTANTS /* We associate each numeric ID with an appropriate descriptive string * using a constant array of these structs. * FIXME: we should be able to arrange to throw away most of the strings * using the initdata stuff. Then we wouldn't need to worry about * carrying them around... * I think we do this by copying them into newly kmalloc()ed memory and * marking the names[] array as .initdata ? */ struct dioname { int id; const char *name; }; /* useful macro */ #define DIONAME(x) { DIO_ID_##x, DIO_DESC_##x } #define DIOFBNAME(x) { DIO_ENCODE_ID( DIO_ID_FBUFFER, DIO_ID2_##x), DIO_DESC2_##x } static struct dioname names[] = { DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM), DIONAME(DCM), DIONAME(DCMREM), DIONAME(LAN), DIONAME(FHPIB), DIONAME(NHPIB), DIONAME(IHPIB), DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3), DIONAME(FBUFFER), DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM), DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3), DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7), DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11), DIONAME(MISC12), DIONAME(MISC13), DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE), DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE), DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION), DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS) }; #undef DIONAME #undef DIOFBNAME #define NUMNAMES (sizeof(names) / sizeof(struct dioname)) static const char *unknowndioname = "unknown DIO board -- please email !"; static const char *dio_getname(int id) { /* return pointer to a constant string describing the board with given ID */ unsigned int i; for (i = 0; i < NUMNAMES; i++) if (names[i].id == id) return names[i].name; return unknowndioname; } #else static char dio_no_name[] = { 0 }; #define dio_getname(_id) (dio_no_name) #endif /* CONFIG_DIO_CONSTANTS */ /* We represent all the DIO boards in the system with a linked list of these structs. */ struct dioboard { struct dioboard *next; /* link to next struct in list */ int ipl; /* IPL of this board */ int configured; /* has this board been configured? */ int scode; /* select code of this board */ int id; /* encoded ID */ const char *name; }; static struct dioboard *blist = NULL; static int __init dio_find_slow(int deviceid) { /* Called to find a DIO device before the full bus scan has run. Basically * only used by the console driver. * We don't do the primary+secondary ID encoding thing here. Maybe we should. * (that would break the topcat detection, though. I need to think about * the whole primary/secondary ID thing.) */ int scode; u_char prid; for (scode = 0; scode < DIO_SCMAX; scode++) { void *va; if (DIO_SCINHOLE(scode)) continue; va = dio_scodetoviraddr(scode); if (!va || !hwreg_present(va + DIO_IDOFF)) continue; /* no board present at that select code */ /* We aren't very likely to want to use this to get at the IHPIB, * but maybe it's returning the same ID as the card we do want... */ if (!DIO_ISIHPIB(scode)) prid = DIO_ID(va); else prid = DIO_ID_IHPIB; if (prid == deviceid) return scode; } return 0; } /* Aargh: we use 0 for an error return code, but select code 0 exists! * FIXME (trivial, use -1, but requires changes to all the drivers :-< ) */ int dio_find(int deviceid) { if (blist) { /* fast way */ struct dioboard *b; for (b = blist; b; b = b->next) if (b->id == deviceid && b->configured == 0) return b->scode; return 0; } return dio_find_slow(deviceid); } /* This is the function that scans the DIO space and works out what * hardware is actually present. */ void __init dio_init(void) { int scode; struct dioboard *b, *bprev = NULL; printk("Scanning for DIO devices...\n"); for (scode = 0; scode < DIO_SCMAX; ++scode) { u_char prid, secid = 0; /* primary, secondary ID bytes */ u_char *va; if (DIO_SCINHOLE(scode)) continue; va = dio_scodetoviraddr(scode); if (!va || !hwreg_present(va + DIO_IDOFF)) continue; /* no board present at that select code */ /* Found a board, allocate it an entry in the list */ b = kmalloc(sizeof(struct dioboard), GFP_KERNEL); /* read the ID byte(s) and encode if necessary. Note workaround * for broken internal HPIB devices... */ if (!DIO_ISIHPIB(scode)) prid = DIO_ID(va); else prid = DIO_ID_IHPIB; if (DIO_NEEDSSECID(prid)) { secid = DIO_SECID(va); b->id = DIO_ENCODE_ID(prid, secid); } else b->id = prid; b->configured = 0; b->scode = scode; b->ipl = DIO_IPL(va); b->name = dio_getname(b->id); printk("select code %3d: ipl %d: ID %02X", scode, b->ipl, prid); if (DIO_NEEDSSECID(b->id)) printk(":%02X", secid); printk(": %s\n", b->name); b->next = NULL; if (bprev) bprev->next = b; else blist = b; bprev = b; } } /* Bear in mind that this is called in the very early stages of initialisation * in order to get the virtual address of the serial port for the console... */ void *dio_scodetoviraddr(int scode) { if (scode > DIOII_SCBASE) { printk("dio_scodetoviraddr: don't support DIO-II yet!\n"); return 0; } else if (scode > DIO_SCMAX || scode < 0) return 0; else if (DIO_SCINHOLE(scode)) return 0; else if (DIO_ISIHPIB(scode)) return (void*)DIO_IHPIBADDR; return (void*)(DIO_VIRADDRBASE + DIO_BASE + scode * 0x10000); } int dio_scodetoipl(int scode) { struct dioboard *b; for (b = blist; b; b = b->next) if (b->scode == scode) break; if (!b) { printk("dio_scodetoipl: bad select code %d\n", scode); return 0; } else return b->ipl; } const char *dio_scodetoname(int scode) { struct dioboard *b; for (b = blist; b; b = b->next) if (b->scode == scode) break; if (!b) { printk("dio_scodetoname: bad select code %d\n", scode); return NULL; } else return b->name; } void dio_config_board(int scode) { struct dioboard *b; for (b = blist; b; b = b->next) if (b->scode == scode) break; if (!b) printk("dio_config_board: bad select code %d\n", scode); else if (b->configured) printk("dio_config_board: board at select code %d already configured\n", scode); else b->configured = 1; } void dio_unconfig_board(int scode) { struct dioboard *b; for (b = blist; b; b = b->next) if (b->scode == scode) break; if (!b) printk("dio_unconfig_board: bad select code %d\n", scode); else if (!b->configured) printk("dio_unconfig_board: board at select code %d not configured\n", scode); else b->configured = 0; }