/* * 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/slab.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; /* * Locks for IDE setting functionality */ DEFINE_MUTEX(ide_setting_mtx); ide_devset_get(io_32bit, io_32bit); static int set_io_32bit(ide_drive_t *drive, int arg) { if (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT) return -EPERM; if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1)) return -EINVAL; drive->io_32bit = arg; return 0; } ide_devset_get_flag(ksettings, IDE_DFLAG_KEEP_SETTINGS); static int set_ksettings(ide_drive_t *drive, int arg) { if (arg < 0 || arg > 1) return -EINVAL; if (arg) drive->dev_flags |= IDE_DFLAG_KEEP_SETTINGS; else drive->dev_flags &= ~IDE_DFLAG_KEEP_SETTINGS; return 0; } ide_devset_get_flag(using_dma, IDE_DFLAG_USING_DMA); static int set_using_dma(ide_drive_t *drive, int arg) { #ifdef CONFIG_BLK_DEV_IDEDMA int err = -EPERM; if (arg < 0 || arg > 1) return -EINVAL; if (ata_id_has_dma(drive->id) == 0) goto out; if (drive->hwif->dma_ops == NULL) goto out; err = 0; if (arg) { if (ide_set_dma(drive)) err = -EIO; } else ide_dma_off(drive); out: return err; #else if (arg < 0 || arg > 1) return -EINVAL; return -EPERM; #endif } /* * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away */ static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio) { switch (req_pio) { case 202: case 201: case 200: case 102: case 101: case 100: return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0; case 9: case 8: return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0; case 7: case 6: return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0; default: return 0; } } static int set_pio_mode(ide_drive_t *drive, int arg) { ide_hwif_t *hwif = drive->hwif; const struct ide_port_ops *port_ops = hwif->port_ops; if (arg < 0 || arg > 255) return -EINVAL; if (port_ops == NULL || port_ops->set_pio_mode == NULL || (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)) return -ENOSYS; if (set_pio_mode_abuse(drive->hwif, arg)) { if (arg == 8 || arg == 9) { unsigned long flags; /* take lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT */ spin_lock_irqsave(&hwif->lock, flags); port_ops->set_pio_mode(drive, arg); spin_unlock_irqrestore(&hwif->lock, flags); } else port_ops->set_pio_mode(drive, arg); } else { int keep_dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA); ide_set_pio(drive, arg); if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) { if (keep_dma) ide_dma_on(drive); } } return 0; } ide_devset_get_flag(unmaskirq, IDE_DFLAG_UNMASK); static int set_unmaskirq(ide_drive_t *drive, int arg) { if (drive->dev_flags & IDE_DFLAG_NO_UNMASK) return -EPERM; if (arg < 0 || arg > 1) return -EINVAL; if (arg) drive->dev_flags |= IDE_DFLAG_UNMASK; else drive->dev_flags &= ~IDE_DFLAG_UNMASK; return 0; } ide_ext_devset_rw_sync(io_32bit, io_32bit); ide_ext_devset_rw_sync(keepsettings, ksettings); ide_ext_devset_rw_sync(unmaskirq, unmaskirq); ide_ext_devset_rw_sync(using_dma, using_dma); __IDE_DEVSET(pio_mode, DS_SYNC, NULL, set_pio_mode); /** * 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; 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_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; 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_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; 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; } 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");