/*
* Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
* Copyright (C) 2003-2005, 2007 Bartlomiej Zolnierkiewicz
*/
/*
* Mostly written by Mark Lord <mlord@pobox.com>
* and Gadi Oxman <gadio@netvision.net.il>
* and Andre Hedrick <andre@linux-ide.org>
*
* See linux/MAINTAINERS for address of current maintainer.
*
* This is the multiple IDE interface driver, as evolved from hd.c.
* It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
* (usually 14 & 15).
* There can be up to two drives per interface, as per the ATA-2 spec.
*
* ...
*
* From hd.c:
* |
* | It traverses the request-list, using interrupts to jump between functions.
* | As nearly all functions can be called within interrupts, we may not sleep.
* | Special care is recommended. Have Fun!
* |
* | modified by Drew Eckhardt to check nr of hd's from the CMOS.
* |
* | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
* | in the early extended-partition checks and added DM partitions.
* |
* | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
* |
* | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
* | and general streamlining by Mark Lord (mlord@pobox.com).
*
* October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
*
* Mark Lord (mlord@pobox.com) (IDE Perf.Pkg)
* Delman Lee (delman@ieee.org) ("Mr. atdisk2")
* Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
*
* This was a rewrite of just about everything from hd.c, though some original
* code is still sprinkled about. Think of it as a major evolution, with
* inspiration from lots of linux users, esp. hamish@zot.apana.org.au
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/hdreg.h>
#include <linux/completion.h>
#include <linux/device.h>
struct class *ide_port_class;
/**
* ide_device_get - get an additional reference to a ide_drive_t
* @drive: device to get a reference to
*
* Gets a reference to the ide_drive_t and increments the use count of the
* underlying LLDD module.
*/
int ide_device_get(ide_drive_t *drive)
{
struct device *host_dev;
struct module *module;
if (!get_device(&drive->gendev))
return -ENXIO;
host_dev = drive->hwif->host->dev[0];
module = host_dev ? host_dev->driver->owner : NULL;
if (module && !try_module_get(module)) {
put_device(&drive->gendev);
return -ENXIO;
}
return 0;
}
EXPORT_SYMBOL_GPL(ide_device_get);
/**
* ide_device_put - release a reference to a ide_drive_t
* @drive: device to release a reference on
*
* Release a reference to the ide_drive_t and decrements the use count of
* the underlying LLDD module.
*/
void ide_device_put(ide_drive_t *drive)
{
#ifdef CONFIG_MODULE_UNLOAD
struct device *host_dev = drive->hwif->host->dev[0];
struct module *module = host_dev ? host_dev->driver->owner : NULL;
if (module)
module_put(module);
#endif
put_device(&drive->gendev);
}
EXPORT_SYMBOL_GPL(ide_device_put);
static int ide_bus_match(struct device *dev, struct device_driver *drv)
{
return 1;
}
static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
{
ide_drive_t *drive = to_ide_device(dev);
add_uevent_var(env, "MEDIA=%s", ide_media_string(drive));
add_uevent_var(env, "DRIVENAME=%s", drive->name);
add_uevent_var(env, "MODALIAS=ide:m-%s", ide_media_string(drive));
return 0;
}
static int generic_ide_probe(struct device *dev)
{
ide_drive_t *drive = to_ide_device(dev);
struct ide_driver *drv = to_ide_driver(dev->driver);
return drv->probe ? drv->probe(drive) : -ENODEV;
}
static int generic_ide_remove(struct device *dev)
{
ide_drive_t *drive = to_ide_device(dev);
struct ide_driver *drv = to_ide_driver(dev->driver);
if (drv->remove)
drv->remove(drive);
return 0;
}
static void generic_ide_shutdown(struct device *dev)
{
ide_drive_t *drive = to_ide_device(dev);
struct ide_driver *drv = to_ide_driver(dev->driver);
if (dev->driver && drv->shutdown)
drv->shutdown(drive);
}
struct bus_type ide_bus_type = {
.name = "ide",
.match = ide_bus_match,
.uevent = ide_uevent,
.probe = generic_ide_probe,
.remove = generic_ide_remove,
.shutdown = generic_ide_shutdown,
.dev_attrs = ide_dev_attrs,
.suspend = generic_ide_suspend,
.resume = generic_ide_resume,
};
EXPORT_SYMBOL_GPL(ide_bus_type);
int ide_vlb_clk;
EXPORT_SYMBOL_GPL(ide_vlb_clk);
module_param_named(vlb_clock, ide_vlb_clk, int, 0);
MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
int ide_pci_clk;
EXPORT_SYMBOL_GPL(ide_pci_clk);
module_param_named(pci_clock, ide_pci_clk, int, 0);
MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
{
int a, b, i, j = 1;
unsigned int *dev_param_mask = (unsigned int *)kp->arg;
/* controller . device (0 or 1) [ : 1 (set) | 0 (clear) ] */
if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
sscanf(s, "%d.%d", &a, &b) != 2)
return -EINVAL;
i = a * MAX_DRIVES + b;
if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
return -EINVAL;
if (j)
*dev_param_mask |= (1 << i);
else
*dev_param_mask &= ~(1 << i);
return 0;
}
static unsigned int ide_nodma;
module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
MODULE_PARM_DESC(nodma, "disallow DMA for a device");
static unsigned int ide_noflush;
module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
MODULE_PARM_DESC(noflush, "disable flush requests for a device");
static unsigned int ide_nohpa;
module_param_call(nohpa, ide_set_dev_param_mask, NULL, &ide_nohpa, 0);
MODULE_PARM_DESC(nohpa, "disable Host Protected Area for a device");
static unsigned int ide_noprobe;
module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
MODULE_PARM_DESC(noprobe, "skip probing for a device");
static unsigned int ide_nowerr;
module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
static unsigned int ide_cdroms;
module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
struct chs_geom {
unsigned int cyl;
u8 head;
u8 sect;
};
static unsigned int ide_disks;
static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
{
int a, b, c = 0, h = 0, s = 0, i, j = 1;
/* controller . device (0 or 1) : Cylinders , Heads , Sectors */
/* controller . device (0 or 1) : 1 (use CHS) | 0 (ignore CHS) */
if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
return -EINVAL;
i = a * MAX_DRIVES + b;
if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
return -EINVAL;
if (c > INT_MAX || h > 255 || s > 255)
return -EINVAL;
if (j)
ide_disks |= (1 << i);
else
ide_disks &= ~(1 << i);
ide_disks_chs[i].cyl = c;
ide_disks_chs[i].head = h;
ide_disks_chs[i].sect = s;
return 0;
}
module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
static void ide_dev_apply_params(ide_drive_t *drive, u8 unit)
{
int i = drive->hwif->index * MAX_DRIVES + unit;
if (ide_nodma & (1 << i)) {
printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
drive->dev_flags |= IDE_DFLAG_NODMA;
}
if (ide_noflush & (1 << i)) {
printk(KERN_INFO "ide: disabling flush requests for %s\n",
drive->name);
drive->dev_flags |= IDE_DFLAG_NOFLUSH;
}
if (ide_nohpa & (1 << i)) {
printk(KERN_INFO "ide: disabling Host Protected Area for %s\n",
drive->name);
drive->dev_flags |= IDE_DFLAG_NOHPA;
}
if (ide_noprobe & (1 << i)) {
printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
drive->dev_flags |= IDE_DFLAG_NOPROBE;
}
if (ide_nowerr & (1 << i)) {
printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
drive->name);
drive->bad_wstat = BAD_R_STAT;
}
if (ide_cdroms & (1 << i)) {
printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
drive->dev_flags |= IDE_DFLAG_PRESENT;
drive->media = ide_cdrom;
/* an ATAPI device ignores DRDY */
drive->ready_stat = 0;
}
if (ide_disks & (1 << i)) {
drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl;
drive->head = drive->bios_head = ide_disks_chs[i].head;
drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
drive->name,
drive->cyl, drive->head, drive->sect);
drive->dev_flags |= IDE_DFLAG_FORCED_GEOM | IDE_DFLAG_PRESENT;
drive->media = ide_disk;
drive->ready_stat = ATA_DRDY;
}
}
static unsigned int ide_ignore_cable;
static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
{
int i, j = 1;
/* controller (ignore) */
/* controller : 1 (ignore) | 0 (use) */
if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
return -EINVAL;
if (i >= MAX_HWIFS || j < 0 || j > 1)
return -EINVAL;
if (j)
ide_ignore_cable |= (1 << i);
else
ide_ignore_cable &= ~(1 << i);
return 0;
}
module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
void ide_port_apply_params(ide_hwif_t *hwif)
{
ide_drive_t *drive;
int i;
if (ide_ignore_cable & (1 << hwif->index)) {
printk(KERN_INFO "ide: ignoring cable detection for %s\n",
hwif->name);
hwif->cbl = ATA_CBL_PATA40_SHORT;
}
ide_port_for_each_dev(i, drive, hwif)
ide_dev_apply_params(drive, i);
}
/*
* This is gets invoked once during initialization, to set *everything* up
*/
static int __init ide_init(void)
{
int ret;
printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
ret = bus_register(&ide_bus_type);
if (ret < 0) {
printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
return ret;
}
ide_port_class = class_create(THIS_MODULE, "ide_port");
if (IS_ERR(ide_port_class)) {
ret = PTR_ERR(ide_port_class);
goto out_port_class;
}
ide_acpi_init();
proc_ide_create();
return 0;
out_port_class:
bus_unregister(&ide_bus_type);
return ret;
}
static void __exit ide_exit(void)
{
proc_ide_destroy();
class_destroy(ide_port_class);
bus_unregister(&ide_bus_type);
}
module_init(ide_init);
module_exit(ide_exit);
MODULE_LICENSE("GPL");
