/* Code to support devices on the DIO and DIO-II bus * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk> * Copyright (C) 2004 Jochen Friedrich <jochen@scram.de> *  * 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. * unsigned long dio_scodetophysaddr(int scode) *    Return the physical address corresponding to the given select code. * 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 <linux/module.h>#include <linux/string.h>#include <linux/types.h>#include <linux/kernel.h>#include <linux/init.h>#include <linux/dio.h>#include <linux/slab.h>                         /* kmalloc() */#include <asm/uaccess.h>#include <asm/io.h>                             /* readb() */struct dio_bus dio_bus = {	.resources = {		/* DIO range */		{ .name = "DIO mem", .start = 0x00600000, .end = 0x007fffff },		/* DIO-II range */		{ .name = "DIO-II mem", .start = 0x01000000, .end = 0x1fffffff }	},	.name = "DIO bus"};/* 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(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 <linux-m68k@lists.linux-m68k.org>!";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;}#elsestatic char dio_no_name[] = { 0 };#define dio_getname(_id)	(dio_no_name)#endif /* CONFIG_DIO_CONSTANTS */int __init dio_find(int deviceid){	/* Called to find a DIO device before the full bus scan has run.	 * Only used by the console driver.	 */	int scode, id;	u_char prid, secid, i;	mm_segment_t fs;	for (scode = 0; scode < DIO_SCMAX; scode++) {		void *va;		unsigned long pa;                if (DIO_SCINHOLE(scode))                        continue;                pa = dio_scodetophysaddr(scode);		if (!pa)			continue;		if (scode < DIOII_SCBASE)			va = (void *)(pa + DIO_VIRADDRBASE);		else			va = ioremap(pa, PAGE_SIZE);		fs = get_fs();		set_fs(KERNEL_DS);                if (get_user(i, (unsigned char *)va + DIO_IDOFF)) {			set_fs(fs);			if (scode >= DIOII_SCBASE)				iounmap(va);                        continue;             /* no board present at that select code */		}		set_fs(fs);		prid = DIO_ID(va);                if (DIO_NEEDSSECID(prid)) {                        secid = DIO_SECID(va);                        id = DIO_ENCODE_ID(prid, secid);                } else			id = prid;		if (id == deviceid) {			if (scode >= DIOII_SCBASE)				iounmap(va);			return scode;		}	}	return -1;}/* This is the function that scans the DIO space and works out what * hardware is actually present. */static int __init dio_init(void){	int scode;	mm_segment_t fs;	int i;	struct dio_dev *dev;	if (!MACH_IS_HP300)		return 0;        printk(KERN_INFO "Scanning for DIO devices...\n");	/* Initialize the DIO bus */ 	INIT_LIST_HEAD(&dio_bus.devices);	strcpy(dio_bus.dev.bus_id, "dio");	device_register(&dio_bus.dev);	/* Request all resources */	dio_bus.num_resources = (hp300_model == HP_320 ? 1 : 2);	for (i = 0; i < dio_bus.num_resources; i++)		request_resource(&iomem_resource, &dio_bus.resources[i]);	/* Register all devices */        for (scode = 0; scode < DIO_SCMAX; ++scode)        {                u_char prid, secid = 0;        /* primary, secondary ID bytes */                u_char *va;		unsigned long pa;                                if (DIO_SCINHOLE(scode))                        continue;		pa = dio_scodetophysaddr(scode);		if (!pa)			continue;		if (scode < DIOII_SCBASE)			va = (void *)(pa + DIO_VIRADDRBASE);		else			va = ioremap(pa, PAGE_SIZE);		fs = get_fs();		set_fs(KERNEL_DS);                if (get_user(i, (unsigned char *)va + DIO_IDOFF)) {			set_fs(fs);			if (scode >= DIOII_SCBASE)				iounmap(va);                        continue;              /* no board present at that select code */		}		set_fs(fs);                /* Found a board, allocate it an entry in the list */		dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL);		if (!dev)			return 0;		dev->bus = &dio_bus;		dev->dev.parent = &dio_bus.dev;		dev->dev.bus = &dio_bus_type;		dev->scode = scode;		dev->resource.start = pa;		dev->resource.end = pa + DIO_SIZE(scode, va);		sprintf(dev->dev.bus_id,"%02x", scode);                /* read the ID byte(s) and encode if necessary. */		prid = DIO_ID(va);                if (DIO_NEEDSSECID(prid)) {                        secid = DIO_SECID(va);                        dev->id = DIO_ENCODE_ID(prid, secid);                } else                        dev->id = prid;                dev->ipl = DIO_IPL(va);                strcpy(dev->name,dio_getname(dev->id));                printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid);                if (DIO_NEEDSSECID(prid))                        printk(":%02X", secid);                printk(": %s\n", dev->name);		if (scode >= DIOII_SCBASE)			iounmap(va);		device_register(&dev->dev);		dio_create_sysfs_dev_files(dev);        }	return 0;}subsys_initcall(dio_init);/* Bear in mind that this is called in the very early stages of initialisation * in order to get the address of the serial port for the console... */unsigned long dio_scodetophysaddr(int scode){        if (scode >= DIOII_SCBASE) {                return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE);        } else if (scode > DIO_SCMAX || scode < 0)                return 0;        else if (DIO_SCINHOLE(scode))                return 0;        return (DIO_BASE + scode * DIO_DEVSIZE);}