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drivers/ide/ide.c
10.4 KB
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/* |
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* Copyright (C) 1994-1998 Linus Torvalds & authors (see below) |
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* Copyright (C) 2003-2005, 2007 Bartlomiej Zolnierkiewicz |
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*/ /* * 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. * |
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* ... * * 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 |
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*/ |
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#include <linux/module.h> #include <linux/types.h> #include <linux/string.h> #include <linux/kernel.h> |
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#include <linux/interrupt.h> #include <linux/major.h> #include <linux/errno.h> #include <linux/genhd.h> |
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#include <linux/init.h> #include <linux/pci.h> |
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#include <linux/ide.h> |
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#include <linux/hdreg.h> |
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#include <linux/completion.h> |
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#include <linux/device.h> |
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|
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struct class *ide_port_class; |
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/** * 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; |
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module_put(module); |
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#endif put_device(&drive->gendev); } EXPORT_SYMBOL_GPL(ide_device_put); |
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static int ide_bus_match(struct device *dev, struct device_driver *drv) { return 1; } |
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static int ide_uevent(struct device *dev, struct kobj_uevent_env *env) |
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{ ide_drive_t *drive = to_ide_device(dev); |
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add_uevent_var(env, "MEDIA=%s", ide_media_string(drive)); |
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add_uevent_var(env, "DRIVENAME=%s", drive->name); |
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add_uevent_var(env, "MODALIAS=ide:m-%s", ide_media_string(drive)); |
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return 0; } |
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static int generic_ide_probe(struct device *dev) { ide_drive_t *drive = to_ide_device(dev); |
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struct ide_driver *drv = to_ide_driver(dev->driver); |
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return drv->probe ? drv->probe(drive) : -ENODEV; } static int generic_ide_remove(struct device *dev) { ide_drive_t *drive = to_ide_device(dev); |
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struct ide_driver *drv = to_ide_driver(dev->driver); |
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if (drv->remove) drv->remove(drive); return 0; } static void generic_ide_shutdown(struct device *dev) { ide_drive_t *drive = to_ide_device(dev); |
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struct ide_driver *drv = to_ide_driver(dev->driver); |
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if (dev->driver && drv->shutdown) drv->shutdown(drive); } |
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struct bus_type ide_bus_type = { .name = "ide", |
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.match = ide_bus_match, |
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.uevent = ide_uevent, |
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.probe = generic_ide_probe, .remove = generic_ide_remove, .shutdown = generic_ide_shutdown, |
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.dev_groups = ide_dev_groups, |
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.suspend = generic_ide_suspend, .resume = generic_ide_resume, }; |
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EXPORT_SYMBOL_GPL(ide_bus_type); |
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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)"); |
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static int ide_set_dev_param_mask(const char *s, const struct kernel_param *kp) |
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{ |
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unsigned int a, b, i, j = 1; |
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unsigned int *dev_param_mask = (unsigned int *)kp->arg; |
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/* controller . device (0 or 1) [ : 1 (set) | 0 (clear) ] */ |
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if (sscanf(s, "%u.%u:%u", &a, &b, &j) != 3 && sscanf(s, "%u.%u", &a, &b) != 2) |
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return -EINVAL; i = a * MAX_DRIVES + b; |
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if (i >= MAX_HWIFS * MAX_DRIVES || j > 1) |
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return -EINVAL; if (j) *dev_param_mask |= (1 << i); else |
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*dev_param_mask &= ~(1 << i); |
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return 0; } |
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static const struct kernel_param_ops param_ops_ide_dev_mask = { |
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.set = ide_set_dev_param_mask }; #define param_check_ide_dev_mask(name, p) param_check_uint(name, p) |
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static unsigned int ide_nodma; |
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module_param_named(nodma, ide_nodma, ide_dev_mask, 0); |
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MODULE_PARM_DESC(nodma, "disallow DMA for a device"); static unsigned int ide_noflush; |
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module_param_named(noflush, ide_noflush, ide_dev_mask, 0); |
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MODULE_PARM_DESC(noflush, "disable flush requests for a device"); |
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static unsigned int ide_nohpa; |
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module_param_named(nohpa, ide_nohpa, ide_dev_mask, 0); |
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MODULE_PARM_DESC(nohpa, "disable Host Protected Area for a device"); |
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static unsigned int ide_noprobe; |
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module_param_named(noprobe, ide_noprobe, ide_dev_mask, 0); |
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MODULE_PARM_DESC(noprobe, "skip probing for a device"); static unsigned int ide_nowerr; |
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module_param_named(nowerr, ide_nowerr, ide_dev_mask, 0); |
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MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device"); |
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static unsigned int ide_cdroms; |
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module_param_named(cdrom, ide_cdroms, ide_dev_mask, 0); |
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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) { |
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unsigned int a, b, c = 0, h = 0, s = 0, i, j = 1; |
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/* controller . device (0 or 1) : Cylinders , Heads , Sectors */ /* controller . device (0 or 1) : 1 (use CHS) | 0 (ignore CHS) */ |
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if (sscanf(str, "%u.%u:%u,%u,%u", &a, &b, &c, &h, &s) != 5 && sscanf(str, "%u.%u:%u", &a, &b, &j) != 3) |
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return -EINVAL; i = a * MAX_DRIVES + b; |
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if (i >= MAX_HWIFS * MAX_DRIVES || j > 1) |
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return -EINVAL; if (c > INT_MAX || h > 255 || s > 255) return -EINVAL; if (j) ide_disks |= (1 << i); else |
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ide_disks &= ~(1 << i); |
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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)"); |
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static void ide_dev_apply_params(ide_drive_t *drive, u8 unit) |
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{ |
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int i = drive->hwif->index * MAX_DRIVES + unit; |
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if (ide_nodma & (1 << i)) { printk(KERN_INFO "ide: disallowing DMA for %s ", drive->name); |
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drive->dev_flags |= IDE_DFLAG_NODMA; |
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} if (ide_noflush & (1 << i)) { printk(KERN_INFO "ide: disabling flush requests for %s ", drive->name); |
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drive->dev_flags |= IDE_DFLAG_NOFLUSH; |
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} |
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if (ide_nohpa & (1 << i)) { printk(KERN_INFO "ide: disabling Host Protected Area for %s ", drive->name); drive->dev_flags |= IDE_DFLAG_NOHPA; } |
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if (ide_noprobe & (1 << i)) { printk(KERN_INFO "ide: skipping probe for %s ", drive->name); |
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drive->dev_flags |= IDE_DFLAG_NOPROBE; |
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} if (ide_nowerr & (1 << i)) { |
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printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s ", |
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drive->name); drive->bad_wstat = BAD_R_STAT; } |
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if (ide_cdroms & (1 << i)) { printk(KERN_INFO "ide: forcing %s as a CD-ROM ", drive->name); |
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drive->dev_flags |= IDE_DFLAG_PRESENT; |
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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; |
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printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d) ", drive->name, drive->cyl, drive->head, drive->sect); |
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drive->dev_flags |= IDE_DFLAG_FORCED_GEOM | IDE_DFLAG_PRESENT; |
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drive->media = ide_disk; |
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drive->ready_stat = ATA_DRDY; |
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} |
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} |
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static unsigned int ide_ignore_cable; static int ide_set_ignore_cable(const char *s, struct kernel_param *kp) { int i, j = 1; |
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/* controller (ignore) */ /* controller : 1 (ignore) | 0 (use) */ |
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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 |
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ide_ignore_cable &= ~(1 << i); |
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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) { |
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ide_drive_t *drive; |
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int i; |
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if (ide_ignore_cable & (1 << hwif->index)) { printk(KERN_INFO "ide: ignoring cable detection for %s ", hwif->name); hwif->cbl = ATA_CBL_PATA40_SHORT; } |
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ide_port_for_each_dev(i, drive, hwif) ide_dev_apply_params(drive, i); |
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} |
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/* * This is gets invoked once during initialization, to set *everything* up */ static int __init ide_init(void) { |
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int ret; |
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printk(KERN_INFO "Uniform Multi-Platform E-IDE driver "); |
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ret = bus_register(&ide_bus_type); if (ret < 0) { printk(KERN_WARNING "IDE: bus_register error: %d ", ret); return ret; } |
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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; } |
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ide_acpi_init(); |
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proc_ide_create(); |
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return 0; |
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out_port_class: bus_unregister(&ide_bus_type); return ret; |
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} |
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static void __exit ide_exit(void) |
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{ |
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proc_ide_destroy(); |
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class_destroy(ide_port_class); |
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bus_unregister(&ide_bus_type); } |
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module_init(ide_init); |
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module_exit(ide_exit); |
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MODULE_LICENSE("GPL"); |