[linux.git] / drivers / dio / dio.c

// SPDX-License-Identifier: GPL-2.0
/* Code to support devices on the DIO and DIO-II bus
 * Copyright (C) 05/1998 Peter Maydell <[email protected]>
 * Copyright (C) 2004 Jochen Friedrich <[email protected]>
 * 
 * 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 <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

static const char *unknowndioname 
        = "unknown DIO board -- please email <[email protected]>!";

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 */

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 (probe_kernel_read(&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;

        printk(KERN_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 (probe_kernel_read(&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(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);
		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);
                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);
		error = device_register(&dev->dev);
		if (error) {
			pr_err("DIO: Error registering device %s\n",
			       dev->name);
			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);
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/* Code to support devices on the DIO and DIO-II bus
	3	* Copyright (C) 05/1998 Peter Maydell <[email protected]>
	4	* Copyright (C) 2004 Jochen Friedrich <[email protected]>
	5	*
	6	* This code has basically these routines at the moment:
	7	* int dio_find(u_int deviceid)
	8	* Search the list of DIO devices and return the select code
	9	* of the next unconfigured device found that matches the given device ID.
	10	* Note that the deviceid parameter should be the encoded ID.
	11	* This means that framebuffers should pass it as
	12	* DIO_ENCODE_ID(DIO_ID_FBUFFER,DIO_ID2_TOPCAT)
	13	* (or whatever); everybody else just uses DIO_ID_FOOBAR.
	14	* unsigned long dio_scodetophysaddr(int scode)
	15	* Return the physical address corresponding to the given select code.
	16	* int dio_scodetoipl(int scode)
	17	* Every DIO card has a fixed interrupt priority level. This function
	18	* returns it, whatever it is.
	19	* const char *dio_scodetoname(int scode)
	20	* Return a character string describing this board [might be "" if
	21	* not CONFIG_DIO_CONSTANTS]
	22	* void dio_config_board(int scode) mark board as configured in the list
	23	* void dio_unconfig_board(int scode) mark board as no longer configured
	24	*
	25	* This file is based on the way the Amiga port handles Zorro II cards,
	26	* although we aren't so complicated...
	27	*/
	28	#include <linux/module.h>
	29	#include <linux/string.h>
	30	#include <linux/types.h>
	31	#include <linux/kernel.h>
	32	#include <linux/init.h>
	33	#include <linux/dio.h>
	34	#include <linux/slab.h> /* kmalloc() */
7c0f6ba6	35	#include <linux/uaccess.h>
1da177e4 LT	36	#include <asm/io.h> /* readb() */
	37
	38	struct dio_bus dio_bus = {
	39	.resources = {
	40	/* DIO range */
	41	{ .name = "DIO mem", .start = 0x00600000, .end = 0x007fffff },
	42	/* DIO-II range */
	43	{ .name = "DIO-II mem", .start = 0x01000000, .end = 0x1fffffff }
	44	},
	45	.name = "DIO bus"
	46	};
	47
	48	/* not a real config option yet! */
	49	#define CONFIG_DIO_CONSTANTS
	50
	51	#ifdef CONFIG_DIO_CONSTANTS
	52	/* We associate each numeric ID with an appropriate descriptive string
	53	* using a constant array of these structs.
	54	* FIXME: we should be able to arrange to throw away most of the strings
	55	* using the initdata stuff. Then we wouldn't need to worry about
	56	* carrying them around...
	57	* I think we do this by copying them into newly kmalloc()ed memory and
	58	* marking the names[] array as .initdata ?
	59	*/
	60	struct dioname
	61	{
	62	int id;
	63	const char *name;
	64	};
	65
	66	/* useful macro */
	67	#define DIONAME(x) { DIO_ID_##x, DIO_DESC_##x }
	68	#define DIOFBNAME(x) { DIO_ENCODE_ID( DIO_ID_FBUFFER, DIO_ID2_##x), DIO_DESC2_##x }
	69
	70	static struct dioname names[] =
	71	{
	72	DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM),
	73	DIONAME(DCM), DIONAME(DCMREM),
	74	DIONAME(LAN),
	75	DIONAME(FHPIB), DIONAME(NHPIB),
	76	DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3),
	77	DIONAME(FBUFFER),
	78	DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM),
	79	DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3),
	80	DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7),
	81	DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11),
	82	DIONAME(MISC12), DIONAME(MISC13),
	83	DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE),
	84	DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE),
	85	DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION),
	86	DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS)
	87	};
	88
	89	#undef DIONAME
	90	#undef DIOFBNAME
	91
1da177e4 LT	92	static const char *unknowndioname
	93	= "unknown DIO board -- please email <[email protected]>!";
	94
	95	static const char *dio_getname(int id)
	96	{
	97	/* return pointer to a constant string describing the board with given ID */
	98	unsigned int i;
0a8320b0	99	for (i = 0; i < ARRAY_SIZE(names); i++)
1da177e4 LT	100	if (names[i].id == id)
	101	return names[i].name;
	102
	103	return unknowndioname;
	104	}
	105
	106	#else
	107
	108	static char dio_no_name[] = { 0 };
	109	#define dio_getname(_id) (dio_no_name)
	110
	111	#endif /* CONFIG_DIO_CONSTANTS */
	112
	113	int __init dio_find(int deviceid)
	114	{
	115	/* Called to find a DIO device before the full bus scan has run.
	116	* Only used by the console driver.
	117	*/
	118	int scode, id;
	119	u_char prid, secid, i;
1da177e4 LT	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
c02205e9	138	if (probe_kernel_read(&i, (unsigned char *)va + DIO_IDOFF, 1)) {
1da177e4 LT	139	if (scode >= DIOII_SCBASE)
	140	iounmap(va);
	141	continue; /* no board present at that select code */
	142	}
	143
1da177e4 LT	144	prid = DIO_ID(va);
	145
	146	if (DIO_NEEDSSECID(prid)) {
	147	secid = DIO_SECID(va);
	148	id = DIO_ENCODE_ID(prid, secid);
	149	} else
	150	id = prid;
	151
	152	if (id == deviceid) {
	153	if (scode >= DIOII_SCBASE)
	154	iounmap(va);
	155	return scode;
	156	}
	157	}
	158
	159	return -1;
	160	}
	161
	162	/* This is the function that scans the DIO space and works out what
	163	* hardware is actually present.
	164	*/
	165	static int __init dio_init(void)
	166	{
	167	int scode;
1da177e4 LT	168	int i;
1da177e4 LT	169	struct dio_dev *dev;
2e4c77be	170	int error;
1da177e4 LT	171
	172	if (!MACH_IS_HP300)
	173	return 0;
	174
	175	printk(KERN_INFO "Scanning for DIO devices...\n");
	176
	177	/* Initialize the DIO bus */
	178	INIT_LIST_HEAD(&dio_bus.devices);
9591463a	179	dev_set_name(&dio_bus.dev, "dio");
2e4c77be GU	180	error = device_register(&dio_bus.dev);
	181	if (error) {
	182	pr_err("DIO: Error registering dio_bus\n");
	183	return error;
	184	}
1da177e4 LT	185
	186	/* Request all resources */
	187	dio_bus.num_resources = (hp300_model == HP_320 ? 1 : 2);
	188	for (i = 0; i < dio_bus.num_resources; i++)
	189	request_resource(&iomem_resource, &dio_bus.resources[i]);
	190
	191	/* Register all devices */
	192	for (scode = 0; scode < DIO_SCMAX; ++scode)
	193	{
	194	u_char prid, secid = 0; /* primary, secondary ID bytes */
	195	u_char *va;
	196	unsigned long pa;
	197
	198	if (DIO_SCINHOLE(scode))
	199	continue;
	200
	201	pa = dio_scodetophysaddr(scode);
	202
	203	if (!pa)
	204	continue;
	205
	206	if (scode < DIOII_SCBASE)
	207	va = (void *)(pa + DIO_VIRADDRBASE);
	208	else
	209	va = ioremap(pa, PAGE_SIZE);
	210
c02205e9	211	if (probe_kernel_read(&i, (unsigned char *)va + DIO_IDOFF, 1)) {
1da177e4 LT	212	if (scode >= DIOII_SCBASE)
	213	iounmap(va);
	214	continue; /* no board present at that select code */
	215	}
	216
1da177e4	217	/* Found a board, allocate it an entry in the list */
e66860cb	218	dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL);
1da177e4 LT	219	if (!dev)
	220	return 0;
	221
1da177e4 LT	222	dev->bus = &dio_bus;
	223	dev->dev.parent = &dio_bus.dev;
	224	dev->dev.bus = &dio_bus_type;
	225	dev->scode = scode;
	226	dev->resource.start = pa;
	227	dev->resource.end = pa + DIO_SIZE(scode, va);
9591463a	228	dev_set_name(&dev->dev, "%02x", scode);
1da177e4 LT	229
	230	/* read the ID byte(s) and encode if necessary. */
	231	prid = DIO_ID(va);
	232
	233	if (DIO_NEEDSSECID(prid)) {
	234	secid = DIO_SECID(va);
	235	dev->id = DIO_ENCODE_ID(prid, secid);
	236	} else
	237	dev->id = prid;
	238
	239	dev->ipl = DIO_IPL(va);
	240	strcpy(dev->name,dio_getname(dev->id));
	241	printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid);
	242	if (DIO_NEEDSSECID(prid))
	243	printk(":%02X", secid);
	244	printk(": %s\n", dev->name);
	245
	246	if (scode >= DIOII_SCBASE)
	247	iounmap(va);
2e4c77be GU	248	error = device_register(&dev->dev);
	249	if (error) {
	250	pr_err("DIO: Error registering device %s\n",
	251	dev->name);
	252	continue;
	253	}
	254	error = dio_create_sysfs_dev_files(dev);
	255	if (error)
	256	dev_err(&dev->dev, "Error creating sysfs files\n");
1da177e4 LT	257	}
	258	return 0;
	259	}
	260
	261	subsys_initcall(dio_init);
	262
	263	/* Bear in mind that this is called in the very early stages of initialisation
	264	* in order to get the address of the serial port for the console...
	265	*/
	266	unsigned long dio_scodetophysaddr(int scode)
	267	{
	268	if (scode >= DIOII_SCBASE) {
	269	return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE);
	270	} else if (scode > DIO_SCMAX \|\| scode < 0)
	271	return 0;
	272	else if (DIO_SCINHOLE(scode))
	273	return 0;
	274
	275	return (DIO_BASE + scode * DIO_DEVSIZE);
	276	}