cregit-Linux how code gets into the kernel

Release 4.10 drivers/dio/dio.c

Directory: drivers/dio
/* 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; }

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#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; }

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/* 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; }

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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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Directory: drivers/dio
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