277 lines
8.3 KiB
C
277 lines
8.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Code to support devices on the DIO and DIO-II bus
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* Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
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* Copyright (C) 2004 Jochen Friedrich <jochen@scram.de>
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*
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* This code has basically these routines at the moment:
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* int dio_find(u_int deviceid)
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* Search the list of DIO devices and return the select code
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* of the next unconfigured device found that matches the given device ID.
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* Note that the deviceid parameter should be the encoded ID.
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* This means that framebuffers should pass it as
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* DIO_ENCODE_ID(DIO_ID_FBUFFER,DIO_ID2_TOPCAT)
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* (or whatever); everybody else just uses DIO_ID_FOOBAR.
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* unsigned long dio_scodetophysaddr(int scode)
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* Return the physical address corresponding to the given select code.
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* int dio_scodetoipl(int scode)
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* Every DIO card has a fixed interrupt priority level. This function
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* returns it, whatever it is.
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* const char *dio_scodetoname(int scode)
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* Return a character string describing this board [might be "" if
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* not CONFIG_DIO_CONSTANTS]
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* void dio_config_board(int scode) mark board as configured in the list
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* void dio_unconfig_board(int scode) mark board as no longer configured
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*
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* This file is based on the way the Amiga port handles Zorro II cards,
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* although we aren't so complicated...
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/dio.h>
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#include <linux/slab.h> /* kmalloc() */
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#include <linux/uaccess.h>
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#include <asm/io.h> /* readb() */
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struct dio_bus dio_bus = {
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.resources = {
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/* DIO range */
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{ .name = "DIO mem", .start = 0x00600000, .end = 0x007fffff },
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/* DIO-II range */
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{ .name = "DIO-II mem", .start = 0x01000000, .end = 0x1fffffff }
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},
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.name = "DIO bus"
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};
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/* not a real config option yet! */
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#define CONFIG_DIO_CONSTANTS
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#ifdef CONFIG_DIO_CONSTANTS
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/* We associate each numeric ID with an appropriate descriptive string
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* using a constant array of these structs.
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* FIXME: we should be able to arrange to throw away most of the strings
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* using the initdata stuff. Then we wouldn't need to worry about
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* carrying them around...
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* I think we do this by copying them into newly kmalloc()ed memory and
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* marking the names[] array as .initdata ?
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*/
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struct dioname
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{
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int id;
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const char *name;
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};
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/* useful macro */
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#define DIONAME(x) { DIO_ID_##x, DIO_DESC_##x }
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#define DIOFBNAME(x) { DIO_ENCODE_ID( DIO_ID_FBUFFER, DIO_ID2_##x), DIO_DESC2_##x }
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static struct dioname names[] =
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{
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DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM),
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DIONAME(DCM), DIONAME(DCMREM),
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DIONAME(LAN),
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DIONAME(FHPIB), DIONAME(NHPIB),
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DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3),
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DIONAME(FBUFFER),
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DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM),
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DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3),
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DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7),
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DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11),
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DIONAME(MISC12), DIONAME(MISC13),
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DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE),
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DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE),
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DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION),
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DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS)
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};
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#undef DIONAME
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#undef DIOFBNAME
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static const char unknowndioname[]
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= "unknown DIO board, please email linux-m68k@lists.linux-m68k.org";
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static const char *dio_getname(int id)
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{
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/* return pointer to a constant string describing the board with given ID */
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(names); i++)
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if (names[i].id == id)
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return names[i].name;
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return unknowndioname;
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}
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#else
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static char dio_no_name[] = { 0 };
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#define dio_getname(_id) (dio_no_name)
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#endif /* CONFIG_DIO_CONSTANTS */
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int __init dio_find(int deviceid)
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{
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/* Called to find a DIO device before the full bus scan has run.
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* Only used by the console driver.
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*/
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int scode, id;
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u_char prid, secid, i;
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for (scode = 0; scode < DIO_SCMAX; scode++) {
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void *va;
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unsigned long pa;
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if (DIO_SCINHOLE(scode))
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continue;
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pa = dio_scodetophysaddr(scode);
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if (!pa)
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continue;
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if (scode < DIOII_SCBASE)
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va = (void *)(pa + DIO_VIRADDRBASE);
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else
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va = ioremap(pa, PAGE_SIZE);
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if (probe_kernel_read(&i, (unsigned char *)va + DIO_IDOFF, 1)) {
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if (scode >= DIOII_SCBASE)
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iounmap(va);
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continue; /* no board present at that select code */
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}
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prid = DIO_ID(va);
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if (DIO_NEEDSSECID(prid)) {
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secid = DIO_SECID(va);
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id = DIO_ENCODE_ID(prid, secid);
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} else
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id = prid;
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if (id == deviceid) {
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if (scode >= DIOII_SCBASE)
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iounmap(va);
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return scode;
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}
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}
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return -1;
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}
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/* This is the function that scans the DIO space and works out what
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* hardware is actually present.
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*/
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static int __init dio_init(void)
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{
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int scode;
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int i;
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struct dio_dev *dev;
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int error;
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if (!MACH_IS_HP300)
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return 0;
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printk(KERN_INFO "Scanning for DIO devices...\n");
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/* Initialize the DIO bus */
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INIT_LIST_HEAD(&dio_bus.devices);
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dev_set_name(&dio_bus.dev, "dio");
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error = device_register(&dio_bus.dev);
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if (error) {
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pr_err("DIO: Error registering dio_bus\n");
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return error;
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}
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/* Request all resources */
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dio_bus.num_resources = (hp300_model == HP_320 ? 1 : 2);
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for (i = 0; i < dio_bus.num_resources; i++)
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request_resource(&iomem_resource, &dio_bus.resources[i]);
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/* Register all devices */
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for (scode = 0; scode < DIO_SCMAX; ++scode)
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{
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u_char prid, secid = 0; /* primary, secondary ID bytes */
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u_char *va;
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unsigned long pa;
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if (DIO_SCINHOLE(scode))
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continue;
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pa = dio_scodetophysaddr(scode);
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if (!pa)
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continue;
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if (scode < DIOII_SCBASE)
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va = (void *)(pa + DIO_VIRADDRBASE);
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else
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va = ioremap(pa, PAGE_SIZE);
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if (probe_kernel_read(&i, (unsigned char *)va + DIO_IDOFF, 1)) {
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if (scode >= DIOII_SCBASE)
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iounmap(va);
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continue; /* no board present at that select code */
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}
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/* Found a board, allocate it an entry in the list */
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dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL);
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if (!dev)
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return 0;
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dev->bus = &dio_bus;
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dev->dev.parent = &dio_bus.dev;
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dev->dev.bus = &dio_bus_type;
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dev->scode = scode;
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dev->resource.start = pa;
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dev->resource.end = pa + DIO_SIZE(scode, va);
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dev_set_name(&dev->dev, "%02x", scode);
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/* read the ID byte(s) and encode if necessary. */
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prid = DIO_ID(va);
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if (DIO_NEEDSSECID(prid)) {
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secid = DIO_SECID(va);
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dev->id = DIO_ENCODE_ID(prid, secid);
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} else
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dev->id = prid;
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dev->ipl = DIO_IPL(va);
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strcpy(dev->name,dio_getname(dev->id));
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printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid);
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if (DIO_NEEDSSECID(prid))
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printk(":%02X", secid);
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printk(": %s\n", dev->name);
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if (scode >= DIOII_SCBASE)
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iounmap(va);
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error = device_register(&dev->dev);
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if (error) {
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pr_err("DIO: Error registering device %s\n",
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dev->name);
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continue;
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}
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error = dio_create_sysfs_dev_files(dev);
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if (error)
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dev_err(&dev->dev, "Error creating sysfs files\n");
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}
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return 0;
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}
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subsys_initcall(dio_init);
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/* Bear in mind that this is called in the very early stages of initialisation
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* in order to get the address of the serial port for the console...
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*/
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unsigned long dio_scodetophysaddr(int scode)
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{
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if (scode >= DIOII_SCBASE) {
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return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE);
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} else if (scode > DIO_SCMAX || scode < 0)
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return 0;
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else if (DIO_SCINHOLE(scode))
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return 0;
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return (DIO_BASE + scode * DIO_DEVSIZE);
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}
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