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278 lines
8.2 KiB
278 lines
8.2 KiB
// 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 <[email protected]> |
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* Copyright (C) 2004 Jochen Friedrich <[email protected]> |
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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 [email protected]"; |
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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 (copy_from_kernel_nofault(&i, |
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(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 (copy_from_kernel_nofault(&i, |
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(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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