| /* 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 <asm/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; |
| mm_segment_t fs; |
| |
| 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); |
| |
| fs = get_fs(); |
| set_fs(KERNEL_DS); |
| |
| if (get_user(i, (unsigned char *)va + DIO_IDOFF)) { |
| set_fs(fs); |
| if (scode >= DIOII_SCBASE) |
| iounmap(va); |
| continue; /* no board present at that select code */ |
| } |
| |
| set_fs(fs); |
| 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; |
| mm_segment_t fs; |
| 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); |
| |
| fs = get_fs(); |
| set_fs(KERNEL_DS); |
| |
| if (get_user(i, (unsigned char *)va + DIO_IDOFF)) { |
| set_fs(fs); |
| if (scode >= DIOII_SCBASE) |
| iounmap(va); |
| continue; /* no board present at that select code */ |
| } |
| |
| set_fs(fs); |
| |
| /* 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); |
| } |
