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linux/drivers/dio/dio.c

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// 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 <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 <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 */
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);
}
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