diff options
Diffstat (limited to 'kernel/drivers/ide/ide-probe.c')
| -rw-r--r-- | kernel/drivers/ide/ide-probe.c | 1610 |
1 files changed, 1610 insertions, 0 deletions
diff --git a/kernel/drivers/ide/ide-probe.c b/kernel/drivers/ide/ide-probe.c new file mode 100644 index 000000000..4ceba37af --- /dev/null +++ b/kernel/drivers/ide/ide-probe.c @@ -0,0 +1,1610 @@ +/* + * Copyright (C) 1994-1998 Linus Torvalds & authors (see below) + * Copyright (C) 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 IDE probe module, as evolved from hd.c and ide.c. + * + * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot + * by Andrea Arcangeli + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/kernel.h> +#include <linux/timer.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/major.h> +#include <linux/errno.h> +#include <linux/genhd.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/ide.h> +#include <linux/spinlock.h> +#include <linux/kmod.h> +#include <linux/pci.h> +#include <linux/scatterlist.h> + +#include <asm/byteorder.h> +#include <asm/irq.h> +#include <asm/uaccess.h> +#include <asm/io.h> + +/** + * generic_id - add a generic drive id + * @drive: drive to make an ID block for + * + * Add a fake id field to the drive we are passed. This allows + * use to skip a ton of NULL checks (which people always miss) + * and make drive properties unconditional outside of this file + */ + +static void generic_id(ide_drive_t *drive) +{ + u16 *id = drive->id; + + id[ATA_ID_CUR_CYLS] = id[ATA_ID_CYLS] = drive->cyl; + id[ATA_ID_CUR_HEADS] = id[ATA_ID_HEADS] = drive->head; + id[ATA_ID_CUR_SECTORS] = id[ATA_ID_SECTORS] = drive->sect; +} + +static void ide_disk_init_chs(ide_drive_t *drive) +{ + u16 *id = drive->id; + + /* Extract geometry if we did not already have one for the drive */ + if (!drive->cyl || !drive->head || !drive->sect) { + drive->cyl = drive->bios_cyl = id[ATA_ID_CYLS]; + drive->head = drive->bios_head = id[ATA_ID_HEADS]; + drive->sect = drive->bios_sect = id[ATA_ID_SECTORS]; + } + + /* Handle logical geometry translation by the drive */ + if (ata_id_current_chs_valid(id)) { + drive->cyl = id[ATA_ID_CUR_CYLS]; + drive->head = id[ATA_ID_CUR_HEADS]; + drive->sect = id[ATA_ID_CUR_SECTORS]; + } + + /* Use physical geometry if what we have still makes no sense */ + if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) { + drive->cyl = id[ATA_ID_CYLS]; + drive->head = id[ATA_ID_HEADS]; + drive->sect = id[ATA_ID_SECTORS]; + } +} + +static void ide_disk_init_mult_count(ide_drive_t *drive) +{ + u16 *id = drive->id; + u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff; + + if (max_multsect) { + if ((max_multsect / 2) > 1) + id[ATA_ID_MULTSECT] = max_multsect | 0x100; + else + id[ATA_ID_MULTSECT] &= ~0x1ff; + + drive->mult_req = id[ATA_ID_MULTSECT] & 0xff; + + if (drive->mult_req) + drive->special_flags |= IDE_SFLAG_SET_MULTMODE; + } +} + +static void ide_classify_ata_dev(ide_drive_t *drive) +{ + u16 *id = drive->id; + char *m = (char *)&id[ATA_ID_PROD]; + int is_cfa = ata_id_is_cfa(id); + + /* CF devices are *not* removable in Linux definition of the term */ + if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7))) + drive->dev_flags |= IDE_DFLAG_REMOVABLE; + + drive->media = ide_disk; + + if (!ata_id_has_unload(drive->id)) + drive->dev_flags |= IDE_DFLAG_NO_UNLOAD; + + printk(KERN_INFO "%s: %s, %s DISK drive\n", drive->name, m, + is_cfa ? "CFA" : "ATA"); +} + +static void ide_classify_atapi_dev(ide_drive_t *drive) +{ + u16 *id = drive->id; + char *m = (char *)&id[ATA_ID_PROD]; + u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f; + + printk(KERN_INFO "%s: %s, ATAPI ", drive->name, m); + switch (type) { + case ide_floppy: + if (!strstr(m, "CD-ROM")) { + if (!strstr(m, "oppy") && + !strstr(m, "poyp") && + !strstr(m, "ZIP")) + printk(KERN_CONT "cdrom or floppy?, assuming "); + if (drive->media != ide_cdrom) { + printk(KERN_CONT "FLOPPY"); + drive->dev_flags |= IDE_DFLAG_REMOVABLE; + break; + } + } + /* Early cdrom models used zero */ + type = ide_cdrom; + case ide_cdrom: + drive->dev_flags |= IDE_DFLAG_REMOVABLE; +#ifdef CONFIG_PPC + /* kludge for Apple PowerBook internal zip */ + if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) { + printk(KERN_CONT "FLOPPY"); + type = ide_floppy; + break; + } +#endif + printk(KERN_CONT "CD/DVD-ROM"); + break; + case ide_tape: + printk(KERN_CONT "TAPE"); + break; + case ide_optical: + printk(KERN_CONT "OPTICAL"); + drive->dev_flags |= IDE_DFLAG_REMOVABLE; + break; + default: + printk(KERN_CONT "UNKNOWN (type %d)", type); + break; + } + + printk(KERN_CONT " drive\n"); + drive->media = type; + /* an ATAPI device ignores DRDY */ + drive->ready_stat = 0; + if (ata_id_cdb_intr(id)) + drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT; + drive->dev_flags |= IDE_DFLAG_DOORLOCKING; + /* we don't do head unloading on ATAPI devices */ + drive->dev_flags |= IDE_DFLAG_NO_UNLOAD; +} + +/** + * do_identify - identify a drive + * @drive: drive to identify + * @cmd: command used + * @id: buffer for IDENTIFY data + * + * Called when we have issued a drive identify command to + * read and parse the results. This function is run with + * interrupts disabled. + */ + +static void do_identify(ide_drive_t *drive, u8 cmd, u16 *id) +{ + ide_hwif_t *hwif = drive->hwif; + char *m = (char *)&id[ATA_ID_PROD]; + unsigned long flags; + int bswap = 1; + + /* local CPU only; some systems need this */ + local_irq_save_nort(flags); + /* read 512 bytes of id info */ + hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE); + local_irq_restore_nort(flags); + + drive->dev_flags |= IDE_DFLAG_ID_READ; +#ifdef DEBUG + printk(KERN_INFO "%s: dumping identify data\n", drive->name); + ide_dump_identify((u8 *)id); +#endif + ide_fix_driveid(id); + + /* + * ATA_CMD_ID_ATA returns little-endian info, + * ATA_CMD_ID_ATAPI *usually* returns little-endian info. + */ + if (cmd == ATA_CMD_ID_ATAPI) { + if ((m[0] == 'N' && m[1] == 'E') || /* NEC */ + (m[0] == 'F' && m[1] == 'X') || /* Mitsumi */ + (m[0] == 'P' && m[1] == 'i')) /* Pioneer */ + /* Vertos drives may still be weird */ + bswap ^= 1; + } + + ide_fixstring(m, ATA_ID_PROD_LEN, bswap); + ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap); + ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap); + + /* we depend on this a lot! */ + m[ATA_ID_PROD_LEN - 1] = '\0'; + + if (strstr(m, "E X A B Y T E N E S T")) + drive->dev_flags &= ~IDE_DFLAG_PRESENT; + else + drive->dev_flags |= IDE_DFLAG_PRESENT; +} + +/** + * ide_dev_read_id - send ATA/ATAPI IDENTIFY command + * @drive: drive to identify + * @cmd: command to use + * @id: buffer for IDENTIFY data + * @irq_ctx: flag set when called from the IRQ context + * + * Sends an ATA(PI) IDENTIFY request to a drive and waits for a response. + * + * Returns: 0 device was identified + * 1 device timed-out (no response to identify request) + * 2 device aborted the command (refused to identify itself) + */ + +int ide_dev_read_id(ide_drive_t *drive, u8 cmd, u16 *id, int irq_ctx) +{ + ide_hwif_t *hwif = drive->hwif; + struct ide_io_ports *io_ports = &hwif->io_ports; + const struct ide_tp_ops *tp_ops = hwif->tp_ops; + int use_altstatus = 0, rc; + unsigned long timeout; + u8 s = 0, a = 0; + + /* + * Disable device IRQ. Otherwise we'll get spurious interrupts + * during the identify phase that the IRQ handler isn't expecting. + */ + if (io_ports->ctl_addr) + tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS); + + /* take a deep breath */ + if (irq_ctx) + mdelay(50); + else + msleep(50); + + if (io_ports->ctl_addr && + (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) { + a = tp_ops->read_altstatus(hwif); + s = tp_ops->read_status(hwif); + if ((a ^ s) & ~ATA_SENSE) + /* ancient Seagate drives, broken interfaces */ + printk(KERN_INFO "%s: probing with STATUS(0x%02x) " + "instead of ALTSTATUS(0x%02x)\n", + drive->name, s, a); + else + /* use non-intrusive polling */ + use_altstatus = 1; + } + + /* set features register for atapi + * identify command to be sure of reply + */ + if (cmd == ATA_CMD_ID_ATAPI) { + struct ide_taskfile tf; + + memset(&tf, 0, sizeof(tf)); + /* disable DMA & overlap */ + tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE); + } + + /* ask drive for ID */ + tp_ops->exec_command(hwif, cmd); + + timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2; + + /* wait for IRQ and ATA_DRQ */ + if (irq_ctx) { + rc = __ide_wait_stat(drive, ATA_DRQ, BAD_R_STAT, timeout, &s); + if (rc) + return 1; + } else { + rc = ide_busy_sleep(drive, timeout, use_altstatus); + if (rc) + return 1; + + msleep(50); + s = tp_ops->read_status(hwif); + } + + if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) { + /* drive returned ID */ + do_identify(drive, cmd, id); + /* drive responded with ID */ + rc = 0; + /* clear drive IRQ */ + (void)tp_ops->read_status(hwif); + } else { + /* drive refused ID */ + rc = 2; + } + return rc; +} + +int ide_busy_sleep(ide_drive_t *drive, unsigned long timeout, int altstatus) +{ + ide_hwif_t *hwif = drive->hwif; + u8 stat; + + timeout += jiffies; + + do { + msleep(50); /* give drive a breather */ + stat = altstatus ? hwif->tp_ops->read_altstatus(hwif) + : hwif->tp_ops->read_status(hwif); + if ((stat & ATA_BUSY) == 0) + return 0; + } while (time_before(jiffies, timeout)); + + printk(KERN_ERR "%s: timeout in %s\n", drive->name, __func__); + + return 1; /* drive timed-out */ +} + +static u8 ide_read_device(ide_drive_t *drive) +{ + struct ide_taskfile tf; + + drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_DEVICE); + + return tf.device; +} + +/** + * do_probe - probe an IDE device + * @drive: drive to probe + * @cmd: command to use + * + * do_probe() has the difficult job of finding a drive if it exists, + * without getting hung up if it doesn't exist, without trampling on + * ethernet cards, and without leaving any IRQs dangling to haunt us later. + * + * If a drive is "known" to exist (from CMOS or kernel parameters), + * but does not respond right away, the probe will "hang in there" + * for the maximum wait time (about 30 seconds), otherwise it will + * exit much more quickly. + * + * Returns: 0 device was identified + * 1 device timed-out (no response to identify request) + * 2 device aborted the command (refused to identify itself) + * 3 bad status from device (possible for ATAPI drives) + * 4 probe was not attempted because failure was obvious + */ + +static int do_probe (ide_drive_t *drive, u8 cmd) +{ + ide_hwif_t *hwif = drive->hwif; + const struct ide_tp_ops *tp_ops = hwif->tp_ops; + u16 *id = drive->id; + int rc; + u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat; + + /* avoid waiting for inappropriate probes */ + if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA) + return 4; + +#ifdef DEBUG + printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n", + drive->name, present, drive->media, + (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI"); +#endif + + /* needed for some systems + * (e.g. crw9624 as drive0 with disk as slave) + */ + msleep(50); + tp_ops->dev_select(drive); + msleep(50); + + if (ide_read_device(drive) != drive->select && present == 0) { + if (drive->dn & 1) { + /* exit with drive0 selected */ + tp_ops->dev_select(hwif->devices[0]); + /* allow ATA_BUSY to assert & clear */ + msleep(50); + } + /* no i/f present: mmm.. this should be a 4 -ml */ + return 3; + } + + stat = tp_ops->read_status(hwif); + + if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) || + present || cmd == ATA_CMD_ID_ATAPI) { + rc = ide_dev_read_id(drive, cmd, id, 0); + if (rc) + /* failed: try again */ + rc = ide_dev_read_id(drive, cmd, id, 0); + + stat = tp_ops->read_status(hwif); + + if (stat == (ATA_BUSY | ATA_DRDY)) + return 4; + + if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) { + printk(KERN_ERR "%s: no response (status = 0x%02x), " + "resetting drive\n", drive->name, stat); + msleep(50); + tp_ops->dev_select(drive); + msleep(50); + tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET); + (void)ide_busy_sleep(drive, WAIT_WORSTCASE, 0); + rc = ide_dev_read_id(drive, cmd, id, 0); + } + + /* ensure drive IRQ is clear */ + stat = tp_ops->read_status(hwif); + + if (rc == 1) + printk(KERN_ERR "%s: no response (status = 0x%02x)\n", + drive->name, stat); + } else { + /* not present or maybe ATAPI */ + rc = 3; + } + if (drive->dn & 1) { + /* exit with drive0 selected */ + tp_ops->dev_select(hwif->devices[0]); + msleep(50); + /* ensure drive irq is clear */ + (void)tp_ops->read_status(hwif); + } + return rc; +} + +/** + * probe_for_drives - upper level drive probe + * @drive: drive to probe for + * + * probe_for_drive() tests for existence of a given drive using do_probe() + * and presents things to the user as needed. + * + * Returns: 0 no device was found + * 1 device was found + * (note: IDE_DFLAG_PRESENT might still be not set) + */ + +static u8 probe_for_drive(ide_drive_t *drive) +{ + char *m; + int rc; + u8 cmd; + + drive->dev_flags &= ~IDE_DFLAG_ID_READ; + + m = (char *)&drive->id[ATA_ID_PROD]; + strcpy(m, "UNKNOWN"); + + /* skip probing? */ + if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) { + /* if !(success||timed-out) */ + cmd = ATA_CMD_ID_ATA; + rc = do_probe(drive, cmd); + if (rc >= 2) { + /* look for ATAPI device */ + cmd = ATA_CMD_ID_ATAPI; + rc = do_probe(drive, cmd); + } + + if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0) + return 0; + + /* identification failed? */ + if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) { + if (drive->media == ide_disk) { + printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n", + drive->name, drive->cyl, + drive->head, drive->sect); + } else if (drive->media == ide_cdrom) { + printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name); + } else { + /* nuke it */ + printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name); + drive->dev_flags &= ~IDE_DFLAG_PRESENT; + } + } else { + if (cmd == ATA_CMD_ID_ATAPI) + ide_classify_atapi_dev(drive); + else + ide_classify_ata_dev(drive); + } + } + + if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0) + return 0; + + /* The drive wasn't being helpful. Add generic info only */ + if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) { + generic_id(drive); + return 1; + } + + if (drive->media == ide_disk) { + ide_disk_init_chs(drive); + ide_disk_init_mult_count(drive); + } + + return 1; +} + +static void hwif_release_dev(struct device *dev) +{ + ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev); + + complete(&hwif->gendev_rel_comp); +} + +static int ide_register_port(ide_hwif_t *hwif) +{ + int ret; + + /* register with global device tree */ + dev_set_name(&hwif->gendev, "%s", hwif->name); + dev_set_drvdata(&hwif->gendev, hwif); + if (hwif->gendev.parent == NULL) + hwif->gendev.parent = hwif->dev; + hwif->gendev.release = hwif_release_dev; + + ret = device_register(&hwif->gendev); + if (ret < 0) { + printk(KERN_WARNING "IDE: %s: device_register error: %d\n", + __func__, ret); + goto out; + } + + hwif->portdev = device_create(ide_port_class, &hwif->gendev, + MKDEV(0, 0), hwif, "%s", hwif->name); + if (IS_ERR(hwif->portdev)) { + ret = PTR_ERR(hwif->portdev); + device_unregister(&hwif->gendev); + } +out: + return ret; +} + +/** + * ide_port_wait_ready - wait for port to become ready + * @hwif: IDE port + * + * This is needed on some PPCs and a bunch of BIOS-less embedded + * platforms. Typical cases are: + * + * - The firmware hard reset the disk before booting the kernel, + * the drive is still doing it's poweron-reset sequence, that + * can take up to 30 seconds. + * + * - The firmware does nothing (or no firmware), the device is + * still in POST state (same as above actually). + * + * - Some CD/DVD/Writer combo drives tend to drive the bus during + * their reset sequence even when they are non-selected slave + * devices, thus preventing discovery of the main HD. + * + * Doing this wait-for-non-busy should not harm any existing + * configuration and fix some issues like the above. + * + * BenH. + * + * Returns 0 on success, error code (< 0) otherwise. + */ + +static int ide_port_wait_ready(ide_hwif_t *hwif) +{ + const struct ide_tp_ops *tp_ops = hwif->tp_ops; + ide_drive_t *drive; + int i, rc; + + printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name); + + /* Let HW settle down a bit from whatever init state we + * come from */ + mdelay(2); + + /* Wait for BSY bit to go away, spec timeout is 30 seconds, + * I know of at least one disk who takes 31 seconds, I use 35 + * here to be safe + */ + rc = ide_wait_not_busy(hwif, 35000); + if (rc) + return rc; + + /* Now make sure both master & slave are ready */ + ide_port_for_each_dev(i, drive, hwif) { + /* Ignore disks that we will not probe for later. */ + if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 || + (drive->dev_flags & IDE_DFLAG_PRESENT)) { + tp_ops->dev_select(drive); + tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS); + mdelay(2); + rc = ide_wait_not_busy(hwif, 35000); + if (rc) + goto out; + } else + printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n", + drive->name); + } +out: + /* Exit function with master reselected (let's be sane) */ + if (i) + tp_ops->dev_select(hwif->devices[0]); + + return rc; +} + +/** + * ide_undecoded_slave - look for bad CF adapters + * @dev1: slave device + * + * Analyse the drives on the interface and attempt to decide if we + * have the same drive viewed twice. This occurs with crap CF adapters + * and PCMCIA sometimes. + */ + +void ide_undecoded_slave(ide_drive_t *dev1) +{ + ide_drive_t *dev0 = dev1->hwif->devices[0]; + + if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0) + return; + + /* If the models don't match they are not the same product */ + if (strcmp((char *)&dev0->id[ATA_ID_PROD], + (char *)&dev1->id[ATA_ID_PROD])) + return; + + /* Serial numbers do not match */ + if (strncmp((char *)&dev0->id[ATA_ID_SERNO], + (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN)) + return; + + /* No serial number, thankfully very rare for CF */ + if (*(char *)&dev0->id[ATA_ID_SERNO] == 0) + return; + + /* Appears to be an IDE flash adapter with decode bugs */ + printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n"); + + dev1->dev_flags &= ~IDE_DFLAG_PRESENT; +} + +EXPORT_SYMBOL_GPL(ide_undecoded_slave); + +static int ide_probe_port(ide_hwif_t *hwif) +{ + ide_drive_t *drive; + unsigned int irqd; + int i, rc = -ENODEV; + + BUG_ON(hwif->present); + + if ((hwif->devices[0]->dev_flags & IDE_DFLAG_NOPROBE) && + (hwif->devices[1]->dev_flags & IDE_DFLAG_NOPROBE)) + return -EACCES; + + /* + * We must always disable IRQ, as probe_for_drive will assert IRQ, but + * we'll install our IRQ driver much later... + */ + irqd = hwif->irq; + if (irqd) + disable_irq(hwif->irq); + + if (ide_port_wait_ready(hwif) == -EBUSY) + printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name); + + /* + * Second drive should only exist if first drive was found, + * but a lot of cdrom drives are configured as single slaves. + */ + ide_port_for_each_dev(i, drive, hwif) { + (void) probe_for_drive(drive); + if (drive->dev_flags & IDE_DFLAG_PRESENT) + rc = 0; + } + + /* + * Use cached IRQ number. It might be (and is...) changed by probe + * code above + */ + if (irqd) + enable_irq(irqd); + + return rc; +} + +static void ide_port_tune_devices(ide_hwif_t *hwif) +{ + const struct ide_port_ops *port_ops = hwif->port_ops; + ide_drive_t *drive; + int i; + + ide_port_for_each_present_dev(i, drive, hwif) { + ide_check_nien_quirk_list(drive); + + if (port_ops && port_ops->quirkproc) + port_ops->quirkproc(drive); + } + + ide_port_for_each_present_dev(i, drive, hwif) { + ide_set_max_pio(drive); + + drive->dev_flags |= IDE_DFLAG_NICE1; + + if (hwif->dma_ops) + ide_set_dma(drive); + } +} + +/* + * init request queue + */ +static int ide_init_queue(ide_drive_t *drive) +{ + struct request_queue *q; + ide_hwif_t *hwif = drive->hwif; + int max_sectors = 256; + int max_sg_entries = PRD_ENTRIES; + + /* + * Our default set up assumes the normal IDE case, + * that is 64K segmenting, standard PRD setup + * and LBA28. Some drivers then impose their own + * limits and LBA48 we could raise it but as yet + * do not. + */ + + q = blk_init_queue_node(do_ide_request, NULL, hwif_to_node(hwif)); + if (!q) + return 1; + + q->queuedata = drive; + blk_queue_segment_boundary(q, 0xffff); + + if (hwif->rqsize < max_sectors) + max_sectors = hwif->rqsize; + blk_queue_max_hw_sectors(q, max_sectors); + +#ifdef CONFIG_PCI + /* When we have an IOMMU, we may have a problem where pci_map_sg() + * creates segments that don't completely match our boundary + * requirements and thus need to be broken up again. Because it + * doesn't align properly either, we may actually have to break up + * to more segments than what was we got in the first place, a max + * worst case is twice as many. + * This will be fixed once we teach pci_map_sg() about our boundary + * requirements, hopefully soon. *FIXME* + */ + if (!PCI_DMA_BUS_IS_PHYS) + max_sg_entries >>= 1; +#endif /* CONFIG_PCI */ + + blk_queue_max_segments(q, max_sg_entries); + + /* assign drive queue */ + drive->queue = q; + + /* needs drive->queue to be set */ + ide_toggle_bounce(drive, 1); + + return 0; +} + +static DEFINE_MUTEX(ide_cfg_mtx); + +/* + * For any present drive: + * - allocate the block device queue + */ +static int ide_port_setup_devices(ide_hwif_t *hwif) +{ + ide_drive_t *drive; + int i, j = 0; + + mutex_lock(&ide_cfg_mtx); + ide_port_for_each_present_dev(i, drive, hwif) { + if (ide_init_queue(drive)) { + printk(KERN_ERR "ide: failed to init %s\n", + drive->name); + drive->dev_flags &= ~IDE_DFLAG_PRESENT; + continue; + } + + j++; + } + mutex_unlock(&ide_cfg_mtx); + + return j; +} + +static void ide_host_enable_irqs(struct ide_host *host) +{ + ide_hwif_t *hwif; + int i; + + ide_host_for_each_port(i, hwif, host) { + if (hwif == NULL) + continue; + + /* clear any pending IRQs */ + hwif->tp_ops->read_status(hwif); + + /* unmask IRQs */ + if (hwif->io_ports.ctl_addr) + hwif->tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS); + } +} + +/* + * This routine sets up the IRQ for an IDE interface. + */ +static int init_irq (ide_hwif_t *hwif) +{ + struct ide_io_ports *io_ports = &hwif->io_ports; + struct ide_host *host = hwif->host; + irq_handler_t irq_handler = host->irq_handler; + int sa = host->irq_flags; + + if (irq_handler == NULL) + irq_handler = ide_intr; + + if (!host->get_lock) + if (request_irq(hwif->irq, irq_handler, sa, hwif->name, hwif)) + goto out_up; + +#if !defined(__mc68000__) + printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name, + io_ports->data_addr, io_ports->status_addr, + io_ports->ctl_addr, hwif->irq); +#else + printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name, + io_ports->data_addr, hwif->irq); +#endif /* __mc68000__ */ + if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE) + printk(KERN_CONT " (serialized)"); + printk(KERN_CONT "\n"); + + return 0; +out_up: + return 1; +} + +static int ata_lock(dev_t dev, void *data) +{ + /* FIXME: we want to pin hwif down */ + return 0; +} + +static struct kobject *ata_probe(dev_t dev, int *part, void *data) +{ + ide_hwif_t *hwif = data; + int unit = *part >> PARTN_BITS; + ide_drive_t *drive = hwif->devices[unit]; + + if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0) + return NULL; + + if (drive->media == ide_disk) + request_module("ide-disk"); + if (drive->media == ide_cdrom || drive->media == ide_optical) + request_module("ide-cd"); + if (drive->media == ide_tape) + request_module("ide-tape"); + if (drive->media == ide_floppy) + request_module("ide-floppy"); + + return NULL; +} + +static struct kobject *exact_match(dev_t dev, int *part, void *data) +{ + struct gendisk *p = data; + *part &= (1 << PARTN_BITS) - 1; + return &disk_to_dev(p)->kobj; +} + +static int exact_lock(dev_t dev, void *data) +{ + struct gendisk *p = data; + + if (!get_disk(p)) + return -1; + return 0; +} + +void ide_register_region(struct gendisk *disk) +{ + blk_register_region(MKDEV(disk->major, disk->first_minor), + disk->minors, NULL, exact_match, exact_lock, disk); +} + +EXPORT_SYMBOL_GPL(ide_register_region); + +void ide_unregister_region(struct gendisk *disk) +{ + blk_unregister_region(MKDEV(disk->major, disk->first_minor), + disk->minors); +} + +EXPORT_SYMBOL_GPL(ide_unregister_region); + +void ide_init_disk(struct gendisk *disk, ide_drive_t *drive) +{ + ide_hwif_t *hwif = drive->hwif; + unsigned int unit = drive->dn & 1; + + disk->major = hwif->major; + disk->first_minor = unit << PARTN_BITS; + sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit); + disk->queue = drive->queue; +} + +EXPORT_SYMBOL_GPL(ide_init_disk); + +static void drive_release_dev (struct device *dev) +{ + ide_drive_t *drive = container_of(dev, ide_drive_t, gendev); + + ide_proc_unregister_device(drive); + + blk_cleanup_queue(drive->queue); + drive->queue = NULL; + + drive->dev_flags &= ~IDE_DFLAG_PRESENT; + + complete(&drive->gendev_rel_comp); +} + +static int hwif_init(ide_hwif_t *hwif) +{ + if (!hwif->irq) { + printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name); + return 0; + } + + if (register_blkdev(hwif->major, hwif->name)) + return 0; + + if (!hwif->sg_max_nents) + hwif->sg_max_nents = PRD_ENTRIES; + + hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents, + GFP_KERNEL); + if (!hwif->sg_table) { + printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name); + goto out; + } + + sg_init_table(hwif->sg_table, hwif->sg_max_nents); + + if (init_irq(hwif)) { + printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n", + hwif->name, hwif->irq); + goto out; + } + + blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS, + THIS_MODULE, ata_probe, ata_lock, hwif); + return 1; + +out: + unregister_blkdev(hwif->major, hwif->name); + return 0; +} + +static void hwif_register_devices(ide_hwif_t *hwif) +{ + ide_drive_t *drive; + unsigned int i; + + ide_port_for_each_present_dev(i, drive, hwif) { + struct device *dev = &drive->gendev; + int ret; + + dev_set_name(dev, "%u.%u", hwif->index, i); + dev_set_drvdata(dev, drive); + dev->parent = &hwif->gendev; + dev->bus = &ide_bus_type; + dev->release = drive_release_dev; + + ret = device_register(dev); + if (ret < 0) + printk(KERN_WARNING "IDE: %s: device_register error: " + "%d\n", __func__, ret); + } +} + +static void ide_port_init_devices(ide_hwif_t *hwif) +{ + const struct ide_port_ops *port_ops = hwif->port_ops; + ide_drive_t *drive; + int i; + + ide_port_for_each_dev(i, drive, hwif) { + drive->dn = i + hwif->channel * 2; + + if (hwif->host_flags & IDE_HFLAG_IO_32BIT) + drive->io_32bit = 1; + if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT) + drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT; + if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS) + drive->dev_flags |= IDE_DFLAG_UNMASK; + if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS) + drive->dev_flags |= IDE_DFLAG_NO_UNMASK; + + drive->pio_mode = XFER_PIO_0; + + if (port_ops && port_ops->init_dev) + port_ops->init_dev(drive); + } +} + +static void ide_init_port(ide_hwif_t *hwif, unsigned int port, + const struct ide_port_info *d) +{ + hwif->channel = port; + + hwif->chipset = d->chipset ? d->chipset : ide_pci; + + if (d->init_iops) + d->init_iops(hwif); + + /* ->host_flags may be set by ->init_iops (or even earlier...) */ + hwif->host_flags |= d->host_flags; + hwif->pio_mask = d->pio_mask; + + if (d->tp_ops) + hwif->tp_ops = d->tp_ops; + + /* ->set_pio_mode for DTC2278 is currently limited to port 0 */ + if ((hwif->host_flags & IDE_HFLAG_DTC2278) == 0 || hwif->channel == 0) + hwif->port_ops = d->port_ops; + + hwif->swdma_mask = d->swdma_mask; + hwif->mwdma_mask = d->mwdma_mask; + hwif->ultra_mask = d->udma_mask; + + if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) { + int rc; + + hwif->dma_ops = d->dma_ops; + + if (d->init_dma) + rc = d->init_dma(hwif, d); + else + rc = ide_hwif_setup_dma(hwif, d); + + if (rc < 0) { + printk(KERN_INFO "%s: DMA disabled\n", hwif->name); + + hwif->dma_ops = NULL; + hwif->dma_base = 0; + hwif->swdma_mask = 0; + hwif->mwdma_mask = 0; + hwif->ultra_mask = 0; + } + } + + if ((d->host_flags & IDE_HFLAG_SERIALIZE) || + ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) + hwif->host->host_flags |= IDE_HFLAG_SERIALIZE; + + if (d->max_sectors) + hwif->rqsize = d->max_sectors; + else { + if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) || + (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA)) + hwif->rqsize = 256; + else + hwif->rqsize = 65536; + } + + /* call chipset specific routine for each enabled port */ + if (d->init_hwif) + d->init_hwif(hwif); +} + +static void ide_port_cable_detect(ide_hwif_t *hwif) +{ + const struct ide_port_ops *port_ops = hwif->port_ops; + + if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) { + if (hwif->cbl != ATA_CBL_PATA40_SHORT) + hwif->cbl = port_ops->cable_detect(hwif); + } +} + +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 }; + +static void ide_port_init_devices_data(ide_hwif_t *hwif) +{ + ide_drive_t *drive; + int i; + + ide_port_for_each_dev(i, drive, hwif) { + u8 j = (hwif->index * MAX_DRIVES) + i; + u16 *saved_id = drive->id; + + memset(drive, 0, sizeof(*drive)); + memset(saved_id, 0, SECTOR_SIZE); + drive->id = saved_id; + + drive->media = ide_disk; + drive->select = (i << 4) | ATA_DEVICE_OBS; + drive->hwif = hwif; + drive->ready_stat = ATA_DRDY; + drive->bad_wstat = BAD_W_STAT; + drive->special_flags = IDE_SFLAG_RECALIBRATE | + IDE_SFLAG_SET_GEOMETRY; + 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); + } +} + +static void ide_init_port_data(ide_hwif_t *hwif, unsigned int index) +{ + /* 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; + + spin_lock_init(&hwif->lock); + + init_timer(&hwif->timer); + hwif->timer.function = &ide_timer_expiry; + hwif->timer.data = (unsigned long)hwif; + + init_completion(&hwif->gendev_rel_comp); + + hwif->tp_ops = &default_tp_ops; + + ide_port_init_devices_data(hwif); +} + +static void ide_init_port_hw(ide_hwif_t *hwif, struct ide_hw *hw) +{ + memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports)); + hwif->irq = hw->irq; + hwif->dev = hw->dev; + hwif->gendev.parent = hw->parent ? hw->parent : hw->dev; + hwif->config_data = hw->config; +} + +static unsigned int ide_indexes; + +/** + * ide_find_port_slot - find free port slot + * @d: IDE port info + * + * Return the new port slot index or -ENOENT if we are out of free slots. + */ + +static int ide_find_port_slot(const struct ide_port_info *d) +{ + int idx = -ENOENT; + u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1; + u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0; + + /* + * Claim an unassigned slot. + * + * Give preference to claiming other slots before claiming ide0/ide1, + * just in case there's another interface yet-to-be-scanned + * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults). + * + * Unless there is a bootable card that does not use the standard + * ports 0x1f0/0x170 (the ide0/ide1 defaults). + */ + mutex_lock(&ide_cfg_mtx); + if (bootable) { + if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1) + idx = ffz(ide_indexes | i); + } else { + if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1) + idx = ffz(ide_indexes | 3); + else if ((ide_indexes & 3) != 3) + idx = ffz(ide_indexes); + } + if (idx >= 0) + ide_indexes |= (1 << idx); + mutex_unlock(&ide_cfg_mtx); + + return idx; +} + +static void ide_free_port_slot(int idx) +{ + mutex_lock(&ide_cfg_mtx); + ide_indexes &= ~(1 << idx); + mutex_unlock(&ide_cfg_mtx); +} + +static void ide_port_free_devices(ide_hwif_t *hwif) +{ + ide_drive_t *drive; + int i; + + ide_port_for_each_dev(i, drive, hwif) { + kfree(drive->id); + kfree(drive); + } +} + +static int ide_port_alloc_devices(ide_hwif_t *hwif, int node) +{ + int i; + + for (i = 0; i < MAX_DRIVES; i++) { + ide_drive_t *drive; + + drive = kzalloc_node(sizeof(*drive), GFP_KERNEL, node); + if (drive == NULL) + goto out_nomem; + + /* + * In order to keep things simple we have an id + * block for all drives at all times. If the device + * is pre ATA or refuses ATA/ATAPI identify we + * will add faked data to this. + * + * Also note that 0 everywhere means "can't do X" + */ + drive->id = kzalloc_node(SECTOR_SIZE, GFP_KERNEL, node); + if (drive->id == NULL) + goto out_nomem; + + hwif->devices[i] = drive; + } + return 0; + +out_nomem: + ide_port_free_devices(hwif); + return -ENOMEM; +} + +struct ide_host *ide_host_alloc(const struct ide_port_info *d, + struct ide_hw **hws, unsigned int n_ports) +{ + struct ide_host *host; + struct device *dev = hws[0] ? hws[0]->dev : NULL; + int node = dev ? dev_to_node(dev) : -1; + int i; + + host = kzalloc_node(sizeof(*host), GFP_KERNEL, node); + if (host == NULL) + return NULL; + + for (i = 0; i < n_ports; i++) { + ide_hwif_t *hwif; + int idx; + + if (hws[i] == NULL) + continue; + + hwif = kzalloc_node(sizeof(*hwif), GFP_KERNEL, node); + if (hwif == NULL) + continue; + + if (ide_port_alloc_devices(hwif, node) < 0) { + kfree(hwif); + continue; + } + + idx = ide_find_port_slot(d); + if (idx < 0) { + printk(KERN_ERR "%s: no free slot for interface\n", + d ? d->name : "ide"); + ide_port_free_devices(hwif); + kfree(hwif); + continue; + } + + ide_init_port_data(hwif, idx); + + hwif->host = host; + + host->ports[i] = hwif; + host->n_ports++; + } + + if (host->n_ports == 0) { + kfree(host); + return NULL; + } + + host->dev[0] = dev; + + if (d) { + host->init_chipset = d->init_chipset; + host->get_lock = d->get_lock; + host->release_lock = d->release_lock; + host->host_flags = d->host_flags; + host->irq_flags = d->irq_flags; + } + + return host; +} +EXPORT_SYMBOL_GPL(ide_host_alloc); + +static void ide_port_free(ide_hwif_t *hwif) +{ + ide_port_free_devices(hwif); + ide_free_port_slot(hwif->index); + kfree(hwif); +} + +static void ide_disable_port(ide_hwif_t *hwif) +{ + struct ide_host *host = hwif->host; + int i; + + printk(KERN_INFO "%s: disabling port\n", hwif->name); + + for (i = 0; i < MAX_HOST_PORTS; i++) { + if (host->ports[i] == hwif) { + host->ports[i] = NULL; + host->n_ports--; + } + } + + ide_port_free(hwif); +} + +int ide_host_register(struct ide_host *host, const struct ide_port_info *d, + struct ide_hw **hws) +{ + ide_hwif_t *hwif, *mate = NULL; + int i, j = 0; + + ide_host_for_each_port(i, hwif, host) { + if (hwif == NULL) { + mate = NULL; + continue; + } + + ide_init_port_hw(hwif, hws[i]); + ide_port_apply_params(hwif); + + if ((i & 1) && mate) { + hwif->mate = mate; + mate->mate = hwif; + } + + mate = (i & 1) ? NULL : hwif; + + ide_init_port(hwif, i & 1, d); + ide_port_cable_detect(hwif); + + hwif->port_flags |= IDE_PFLAG_PROBING; + + ide_port_init_devices(hwif); + } + + ide_host_for_each_port(i, hwif, host) { + if (hwif == NULL) + continue; + + if (ide_probe_port(hwif) == 0) + hwif->present = 1; + + hwif->port_flags &= ~IDE_PFLAG_PROBING; + + if ((hwif->host_flags & IDE_HFLAG_4DRIVES) == 0 || + hwif->mate == NULL || hwif->mate->present == 0) { + if (ide_register_port(hwif)) { + ide_disable_port(hwif); + continue; + } + } + + if (hwif->present) + ide_port_tune_devices(hwif); + } + + ide_host_enable_irqs(host); + + ide_host_for_each_port(i, hwif, host) { + if (hwif == NULL) + continue; + + if (hwif_init(hwif) == 0) { + printk(KERN_INFO "%s: failed to initialize IDE " + "interface\n", hwif->name); + device_unregister(&hwif->gendev); + ide_disable_port(hwif); + continue; + } + + if (hwif->present) + if (ide_port_setup_devices(hwif) == 0) { + hwif->present = 0; + continue; + } + + j++; + + ide_acpi_init_port(hwif); + + if (hwif->present) + ide_acpi_port_init_devices(hwif); + } + + ide_host_for_each_port(i, hwif, host) { + if (hwif == NULL) + continue; + + ide_sysfs_register_port(hwif); + ide_proc_register_port(hwif); + + if (hwif->present) { + ide_proc_port_register_devices(hwif); + hwif_register_devices(hwif); + } + } + + return j ? 0 : -1; +} +EXPORT_SYMBOL_GPL(ide_host_register); + +int ide_host_add(const struct ide_port_info *d, struct ide_hw **hws, + unsigned int n_ports, struct ide_host **hostp) +{ + struct ide_host *host; + int rc; + + host = ide_host_alloc(d, hws, n_ports); + if (host == NULL) + return -ENOMEM; + + rc = ide_host_register(host, d, hws); + if (rc) { + ide_host_free(host); + return rc; + } + + if (hostp) + *hostp = host; + + return 0; +} +EXPORT_SYMBOL_GPL(ide_host_add); + +static void __ide_port_unregister_devices(ide_hwif_t *hwif) +{ + ide_drive_t *drive; + int i; + + ide_port_for_each_present_dev(i, drive, hwif) { + device_unregister(&drive->gendev); + wait_for_completion(&drive->gendev_rel_comp); + } +} + +void ide_port_unregister_devices(ide_hwif_t *hwif) +{ + mutex_lock(&ide_cfg_mtx); + __ide_port_unregister_devices(hwif); + hwif->present = 0; + ide_port_init_devices_data(hwif); + 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. + * + * Locking: + * The caller must not hold the IDE locks. + * + * 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). + */ + +static void ide_unregister(ide_hwif_t *hwif) +{ + BUG_ON(in_interrupt()); + BUG_ON(irqs_disabled()); + + mutex_lock(&ide_cfg_mtx); + + if (hwif->present) { + __ide_port_unregister_devices(hwif); + hwif->present = 0; + } + + ide_proc_unregister_port(hwif); + + if (!hwif->host->get_lock) + free_irq(hwif->irq, 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<<PARTN_BITS); + kfree(hwif->sg_table); + unregister_blkdev(hwif->major, hwif->name); + + ide_release_dma_engine(hwif); + + mutex_unlock(&ide_cfg_mtx); +} + +void ide_host_free(struct ide_host *host) +{ + ide_hwif_t *hwif; + int i; + + ide_host_for_each_port(i, hwif, host) { + if (hwif) + ide_port_free(hwif); + } + + kfree(host); +} +EXPORT_SYMBOL_GPL(ide_host_free); + +void ide_host_remove(struct ide_host *host) +{ + ide_hwif_t *hwif; + int i; + + ide_host_for_each_port(i, hwif, host) { + if (hwif) + ide_unregister(hwif); + } + + ide_host_free(host); +} +EXPORT_SYMBOL_GPL(ide_host_remove); + +void ide_port_scan(ide_hwif_t *hwif) +{ + int rc; + + ide_port_apply_params(hwif); + ide_port_cable_detect(hwif); + + hwif->port_flags |= IDE_PFLAG_PROBING; + + ide_port_init_devices(hwif); + + rc = ide_probe_port(hwif); + + hwif->port_flags &= ~IDE_PFLAG_PROBING; + + if (rc < 0) + return; + + hwif->present = 1; + + ide_port_tune_devices(hwif); + ide_port_setup_devices(hwif); + ide_acpi_port_init_devices(hwif); + hwif_register_devices(hwif); + ide_proc_port_register_devices(hwif); +} +EXPORT_SYMBOL_GPL(ide_port_scan); |