// SPDX-License-Identifier: GPL-2.0/* 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 <linux/uaccess.h>#include <linux/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 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 < ARRAY_SIZE(names); 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 */ static void dio_dev_release(struct device *dev){	struct dio_dev *ddev = container_of(dev, typeof(struct dio_dev), dev);	kfree(ddev);} 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; 	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); 		if (copy_from_kernel_nofault(&i,				(unsigned char *)va + DIO_IDOFF, 1)) {			if (scode >= DIOII_SCBASE)				iounmap(va);			continue;	     /* no board present at that select code */		} 		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;	int i;	struct dio_dev *dev;	int error; 	if (!MACH_IS_HP300)		return 0; 	pr_info("Scanning for DIO devices...\n"); 	/* Initialize the DIO bus */	INIT_LIST_HEAD(&dio_bus.devices);	dev_set_name(&dio_bus.dev, "dio");	error = device_register(&dio_bus.dev);	if (error) {		pr_err("DIO: Error registering dio_bus\n");		return error;	} 	/* 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); 		if (copy_from_kernel_nofault(&i,				(unsigned char *)va + DIO_IDOFF, 1)) {			if (scode >= DIOII_SCBASE)				iounmap(va);			continue;	      /* no board present at that select code */		} 		/* Found a board, allocate it an entry in the list */		dev = kzalloc_obj(struct dio_dev);		if (!dev) {			if (scode >= DIOII_SCBASE)				iounmap(va);			return -ENOMEM;		} 		dev->bus = &dio_bus;		dev->dev.parent = &dio_bus.dev;		dev->dev.bus = &dio_bus_type;		dev->dev.release = dio_dev_release;		dev->scode = scode;		dev->resource.start = pa;		dev->resource.end = pa + DIO_SIZE(scode, va);		dev_set_name(&dev->dev, "%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);		strscpy(dev->name, dio_getname(dev->id));		if (DIO_NEEDSSECID(prid))			pr_info("select code %3d: ipl %u: ID %02X:%02X: %s\n",				dev->scode, dev->ipl, prid, secid, dev->name);		else			pr_info("select code %3d: ipl %u: ID %02X: %s\n",				dev->scode, dev->ipl, prid, dev->name); 		if (scode >= DIOII_SCBASE)			iounmap(va);		error = device_register(&dev->dev);		if (error) {			pr_err("DIO: Error registering device %s\n", dev->name);			put_device(&dev->dev);			continue;		}		error = dio_create_sysfs_dev_files(dev);		if (error)			dev_err(&dev->dev, "Error creating sysfs files\n");	}	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);}