/* * Copyright (C) 1994-1998 Linus Torvalds & authors (see below) * Copyright (C) 2003-2005, 2007 Bartlomiej Zolnierkiewicz */ /* * Mostly written by Mark Lord * and Gadi Oxman * and Andre Hedrick * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* default maximum number of failures */ #define IDE_DEFAULT_MAX_FAILURES 1 struct class *ide_port_class; static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR, IDE4_MAJOR, IDE5_MAJOR, IDE6_MAJOR, IDE7_MAJOR, IDE8_MAJOR, IDE9_MAJOR }; DEFINE_MUTEX(ide_cfg_mtx); __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock); EXPORT_SYMBOL(ide_lock); static void ide_port_init_devices_data(ide_hwif_t *); /* * Do not even *think* about calling this! */ void ide_init_port_data(ide_hwif_t *hwif, unsigned int index) { /* bulk initialize hwif & drive info with zeros */ memset(hwif, 0, sizeof(ide_hwif_t)); /* fill in any non-zero initial values */ hwif->index = index; hwif->major = ide_hwif_to_major[index]; hwif->name[0] = 'i'; hwif->name[1] = 'd'; hwif->name[2] = 'e'; hwif->name[3] = '0' + index; init_completion(&hwif->gendev_rel_comp); hwif->tp_ops = &default_tp_ops; ide_port_init_devices_data(hwif); } static void ide_port_init_devices_data(ide_hwif_t *hwif) { int unit; for (unit = 0; unit < MAX_DRIVES; ++unit) { ide_drive_t *drive = &hwif->drives[unit]; u8 j = (hwif->index * MAX_DRIVES) + unit; memset(drive, 0, sizeof(*drive)); drive->media = ide_disk; drive->select = (unit << 4) | ATA_DEVICE_OBS; drive->hwif = hwif; drive->ready_stat = ATA_DRDY; drive->bad_wstat = BAD_W_STAT; drive->special.b.recalibrate = 1; drive->special.b.set_geometry = 1; drive->name[0] = 'h'; drive->name[1] = 'd'; drive->name[2] = 'a' + j; drive->max_failures = IDE_DEFAULT_MAX_FAILURES; INIT_LIST_HEAD(&drive->list); init_completion(&drive->gendev_rel_comp); } } /* Called with ide_lock held. */ static void __ide_port_unregister_devices(ide_hwif_t *hwif) { int i; for (i = 0; i < MAX_DRIVES; i++) { ide_drive_t *drive = &hwif->drives[i]; if (drive->dev_flags & IDE_DFLAG_PRESENT) { spin_unlock_irq(&ide_lock); device_unregister(&drive->gendev); wait_for_completion(&drive->gendev_rel_comp); spin_lock_irq(&ide_lock); } } } void ide_port_unregister_devices(ide_hwif_t *hwif) { mutex_lock(&ide_cfg_mtx); spin_lock_irq(&ide_lock); __ide_port_unregister_devices(hwif); hwif->present = 0; ide_port_init_devices_data(hwif); spin_unlock_irq(&ide_lock); mutex_unlock(&ide_cfg_mtx); } EXPORT_SYMBOL_GPL(ide_port_unregister_devices); /** * ide_unregister - free an IDE interface * @hwif: IDE interface * * Perform the final unregister of an IDE interface. At the moment * we don't refcount interfaces so this will also get split up. * * Locking: * The caller must not hold the IDE locks * The drive present/vanishing is not yet properly locked * Take care with the callbacks. These have been split to avoid * deadlocking the IDE layer. The shutdown callback is called * before we take the lock and free resources. It is up to the * caller to be sure there is no pending I/O here, and that * the interface will not be reopened (present/vanishing locking * isn't yet done BTW). After we commit to the final kill we * call the cleanup callback with the ide locks held. * * Unregister restores the hwif structures to the default state. * This is raving bonkers. */ void ide_unregister(ide_hwif_t *hwif) { ide_hwif_t *g; ide_hwgroup_t *hwgroup; int irq_count = 0; BUG_ON(in_interrupt()); BUG_ON(irqs_disabled()); mutex_lock(&ide_cfg_mtx); spin_lock_irq(&ide_lock); if (hwif->present) { __ide_port_unregister_devices(hwif); hwif->present = 0; } spin_unlock_irq(&ide_lock); ide_proc_unregister_port(hwif); hwgroup = hwif->hwgroup; /* * free the irq if we were the only hwif using it */ g = hwgroup->hwif; do { if (g->irq == hwif->irq) ++irq_count; g = g->next; } while (g != hwgroup->hwif); if (irq_count == 1) free_irq(hwif->irq, hwgroup); ide_remove_port_from_hwgroup(hwif); device_unregister(hwif->portdev); device_unregister(&hwif->gendev); wait_for_completion(&hwif->gendev_rel_comp); /* * Remove us from the kernel's knowledge */ blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<sg_table); unregister_blkdev(hwif->major, hwif->name); ide_release_dma_engine(hwif); mutex_unlock(&ide_cfg_mtx); } void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw) { memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports)); hwif->irq = hw->irq; hwif->chipset = hw->chipset; hwif->dev = hw->dev; hwif->gendev.parent = hw->parent ? hw->parent : hw->dev; hwif->ack_intr = hw->ack_intr; hwif->config_data = hw->config; } /* * 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(&ide_lock, flags); port_ops->set_pio_mode(drive, arg); spin_unlock_irqrestore(&ide_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); static int generic_ide_suspend(struct device *dev, pm_message_t mesg) { ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive); ide_hwif_t *hwif = HWIF(drive); struct request *rq; struct request_pm_state rqpm; ide_task_t args; int ret; /* call ACPI _GTM only once */ if ((drive->dn & 1) == 0 || pair == NULL) ide_acpi_get_timing(hwif); memset(&rqpm, 0, sizeof(rqpm)); memset(&args, 0, sizeof(args)); rq = blk_get_request(drive->queue, READ, __GFP_WAIT); rq->cmd_type = REQ_TYPE_PM_SUSPEND; rq->special = &args; rq->data = &rqpm; rqpm.pm_step = IDE_PM_START_SUSPEND; if (mesg.event == PM_EVENT_PRETHAW) mesg.event = PM_EVENT_FREEZE; rqpm.pm_state = mesg.event; ret = blk_execute_rq(drive->queue, NULL, rq, 0); blk_put_request(rq); /* call ACPI _PS3 only after both devices are suspended */ if (ret == 0 && ((drive->dn & 1) || pair == NULL)) ide_acpi_set_state(hwif, 0); return ret; } static int generic_ide_resume(struct device *dev) { ide_drive_t *drive = dev->driver_data, *pair = ide_get_pair_dev(drive); ide_hwif_t *hwif = HWIF(drive); struct request *rq; struct request_pm_state rqpm; ide_task_t args; int err; /* call ACPI _PS0 / _STM only once */ if ((drive->dn & 1) == 0 || pair == NULL) { ide_acpi_set_state(hwif, 1); ide_acpi_push_timing(hwif); } ide_acpi_exec_tfs(drive); memset(&rqpm, 0, sizeof(rqpm)); memset(&args, 0, sizeof(args)); rq = blk_get_request(drive->queue, READ, __GFP_WAIT); rq->cmd_type = REQ_TYPE_PM_RESUME; rq->cmd_flags |= REQ_PREEMPT; rq->special = &args; rq->data = &rqpm; rqpm.pm_step = IDE_PM_START_RESUME; rqpm.pm_state = PM_EVENT_ON; err = blk_execute_rq(drive->queue, NULL, rq, 1); blk_put_request(rq); if (err == 0 && dev->driver) { ide_driver_t *drv = to_ide_driver(dev->driver); if (drv->resume) drv->resume(drive); } return err; } /** * 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 char *media_string(ide_drive_t *drive) { switch (drive->media) { case ide_disk: return "disk"; case ide_cdrom: return "cdrom"; case ide_tape: return "tape"; case ide_floppy: return "floppy"; case ide_optical: return "optical"; default: return "UNKNOWN"; } } static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf) { ide_drive_t *drive = to_ide_device(dev); return sprintf(buf, "%s\n", media_string(drive)); } static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf) { ide_drive_t *drive = to_ide_device(dev); return sprintf(buf, "%s\n", drive->name); } static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { ide_drive_t *drive = to_ide_device(dev); return sprintf(buf, "ide:m-%s\n", media_string(drive)); } static ssize_t model_show(struct device *dev, struct device_attribute *attr, char *buf) { ide_drive_t *drive = to_ide_device(dev); return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_PROD]); } static ssize_t firmware_show(struct device *dev, struct device_attribute *attr, char *buf) { ide_drive_t *drive = to_ide_device(dev); return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_FW_REV]); } static ssize_t serial_show(struct device *dev, struct device_attribute *attr, char *buf) { ide_drive_t *drive = to_ide_device(dev); return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_SERNO]); } static struct device_attribute ide_dev_attrs[] = { __ATTR_RO(media), __ATTR_RO(drivename), __ATTR_RO(modalias), __ATTR_RO(model), __ATTR_RO(firmware), __ATTR(serial, 0400, serial_show, NULL), __ATTR(unload_heads, 0644, ide_park_show, ide_park_store), __ATTR_NULL }; 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", media_string(drive)); add_uevent_var(env, "DRIVENAME=%s", drive->name); add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive)); return 0; } static int generic_ide_probe(struct device *dev) { ide_drive_t *drive = to_ide_device(dev); ide_driver_t *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); ide_driver_t *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); ide_driver_t *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) { 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; } for (i = 0; i < MAX_DRIVES; i++) ide_dev_apply_params(&hwif->drives[i], 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");