diff options
Diffstat (limited to 'drivers/ide/ide-probe.c')
| -rw-r--r-- | drivers/ide/ide-probe.c | 1421 |
1 files changed, 1421 insertions, 0 deletions
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c new file mode 100644 index 0000000..554473a --- /dev/null +++ b/drivers/ide/ide-probe.c @@ -0,0 +1,1421 @@ +/* + * linux/drivers/ide/ide-probe.c Version 1.11 Mar 05, 2003 + * + * Copyright (C) 1994-1998 Linus Torvalds & authors (see below) + */ + +/* + * 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. + * + * Version 1.00 move drive probing code from ide.c to ide-probe.c + * Version 1.01 fix compilation problem for m68k + * Version 1.02 increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot + * by Andrea Arcangeli + * Version 1.03 fix for (hwif->chipset == ide_4drives) + * Version 1.04 fixed buggy treatments of known flash memory cards + * + * Version 1.05 fix for (hwif->chipset == ide_pdc4030) + * added ide6/7/8/9 + * allowed for secondary flash card to be detectable + * with new flag : drive->ata_flash : 1; + * Version 1.06 stream line request queue and prep for cascade project. + * Version 1.07 max_sect <= 255; slower disks would get behind and + * then fall over when they get to 256. Paul G. + * Version 1.10 Update set for new IDE. drive->id is now always + * valid after probe time even with noprobe + */ + +#undef REALLY_SLOW_IO /* most systems can safely undef this */ + +#include <linux/config.h> +#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 <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) +{ + drive->id->cyls = drive->cyl; + drive->id->heads = drive->head; + drive->id->sectors = drive->sect; + drive->id->cur_cyls = drive->cyl; + drive->id->cur_heads = drive->head; + drive->id->cur_sectors = drive->sect; +} + +static void ide_disk_init_chs(ide_drive_t *drive) +{ + struct hd_driveid *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->cyls; + drive->head = drive->bios_head = id->heads; + drive->sect = drive->bios_sect = id->sectors; + } + + /* Handle logical geometry translation by the drive */ + if ((id->field_valid & 1) && id->cur_cyls && + id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) { + drive->cyl = id->cur_cyls; + drive->head = id->cur_heads; + drive->sect = id->cur_sectors; + } + + /* Use physical geometry if what we have still makes no sense */ + if (drive->head > 16 && id->heads && id->heads <= 16) { + drive->cyl = id->cyls; + drive->head = id->heads; + drive->sect = id->sectors; + } +} + +static void ide_disk_init_mult_count(ide_drive_t *drive) +{ + struct hd_driveid *id = drive->id; + + drive->mult_count = 0; + if (id->max_multsect) { +#ifdef CONFIG_IDEDISK_MULTI_MODE + id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0; + id->multsect_valid = id->multsect ? 1 : 0; + drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT; + drive->special.b.set_multmode = drive->mult_req ? 1 : 0; +#else /* original, pre IDE-NFG, per request of AC */ + drive->mult_req = INITIAL_MULT_COUNT; + if (drive->mult_req > id->max_multsect) + drive->mult_req = id->max_multsect; + if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect)) + drive->special.b.set_multmode = 1; +#endif + } +} + +/** + * drive_is_flashcard - check for compact flash + * @drive: drive to check + * + * CompactFlash cards and their brethern pretend to be removable + * hard disks, except: + * (1) they never have a slave unit, and + * (2) they don't have doorlock mechanisms. + * This test catches them, and is invoked elsewhere when setting + * appropriate config bits. + * + * FIXME: This treatment is probably applicable for *all* PCMCIA (PC CARD) + * devices, so in linux 2.3.x we should change this to just treat all + * PCMCIA drives this way, and get rid of the model-name tests below + * (too big of an interface change for 2.4.x). + * At that time, we might also consider parameterizing the timeouts and + * retries, since these are MUCH faster than mechanical drives. -M.Lord + */ + +static inline int drive_is_flashcard (ide_drive_t *drive) +{ + struct hd_driveid *id = drive->id; + + if (drive->removable) { + if (id->config == 0x848a) return 1; /* CompactFlash */ + if (!strncmp(id->model, "KODAK ATA_FLASH", 15) /* Kodak */ + || !strncmp(id->model, "Hitachi CV", 10) /* Hitachi */ + || !strncmp(id->model, "SunDisk SDCFB", 13) /* old SanDisk */ + || !strncmp(id->model, "SanDisk SDCFB", 13) /* SanDisk */ + || !strncmp(id->model, "HAGIWARA HPC", 12) /* Hagiwara */ + || !strncmp(id->model, "LEXAR ATA_FLASH", 15) /* Lexar */ + || !strncmp(id->model, "ATA_FLASH", 9)) /* Simple Tech */ + { + return 1; /* yes, it is a flash memory card */ + } + } + return 0; /* no, it is not a flash memory card */ +} + +/** + * do_identify - identify a drive + * @drive: drive to identify + * @cmd: command used + * + * Called when we have issued a drive identify command to + * read and parse the results. This function is run with + * interrupts disabled. + */ + +static inline void do_identify (ide_drive_t *drive, u8 cmd) +{ + ide_hwif_t *hwif = HWIF(drive); + int bswap = 1; + struct hd_driveid *id; + + id = drive->id; + /* read 512 bytes of id info */ + hwif->ata_input_data(drive, id, SECTOR_WORDS); + + drive->id_read = 1; + local_irq_enable(); + ide_fix_driveid(id); + +#if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA) + /* + * EATA SCSI controllers do a hardware ATA emulation: + * Ignore them if there is a driver for them available. + */ + if ((id->model[0] == 'P' && id->model[1] == 'M') || + (id->model[0] == 'S' && id->model[1] == 'K')) { + printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model); + goto err_misc; + } +#endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */ + + /* + * WIN_IDENTIFY returns little-endian info, + * WIN_PIDENTIFY *usually* returns little-endian info. + */ + if (cmd == WIN_PIDENTIFY) { + if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */ + || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */ + || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */ + /* Vertos drives may still be weird */ + bswap ^= 1; + } + ide_fixstring(id->model, sizeof(id->model), bswap); + ide_fixstring(id->fw_rev, sizeof(id->fw_rev), bswap); + ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap); + + if (strstr(id->model, "E X A B Y T E N E S T")) + goto err_misc; + + /* we depend on this a lot! */ + id->model[sizeof(id->model)-1] = '\0'; + printk("%s: %s, ", drive->name, id->model); + drive->present = 1; + drive->dead = 0; + + /* + * Check for an ATAPI device + */ + if (cmd == WIN_PIDENTIFY) { + u8 type = (id->config >> 8) & 0x1f; + printk("ATAPI "); + switch (type) { + case ide_floppy: + if (!strstr(id->model, "CD-ROM")) { + if (!strstr(id->model, "oppy") && + !strstr(id->model, "poyp") && + !strstr(id->model, "ZIP")) + printk("cdrom or floppy?, assuming "); + if (drive->media != ide_cdrom) { + printk ("FLOPPY"); + drive->removable = 1; + break; + } + } + /* Early cdrom models used zero */ + type = ide_cdrom; + case ide_cdrom: + drive->removable = 1; +#ifdef CONFIG_PPC + /* kludge for Apple PowerBook internal zip */ + if (!strstr(id->model, "CD-ROM") && + strstr(id->model, "ZIP")) { + printk ("FLOPPY"); + type = ide_floppy; + break; + } +#endif + printk ("CD/DVD-ROM"); + break; + case ide_tape: + printk ("TAPE"); + break; + case ide_optical: + printk ("OPTICAL"); + drive->removable = 1; + break; + default: + printk("UNKNOWN (type %d)", type); + break; + } + printk (" drive\n"); + drive->media = type; + /* an ATAPI device ignores DRDY */ + drive->ready_stat = 0; + return; + } + + /* + * Not an ATAPI device: looks like a "regular" hard disk + */ + if (id->config & (1<<7)) + drive->removable = 1; + + if (drive_is_flashcard(drive)) + drive->is_flash = 1; + drive->media = ide_disk; + printk("%s DISK drive\n", (drive->is_flash) ? "CFA" : "ATA" ); + QUIRK_LIST(drive); + return; + +err_misc: + kfree(id); + drive->present = 0; + return; +} + +/** + * actual_try_to_identify - send ata/atapi identify + * @drive: drive to identify + * @cmd: command to use + * + * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive + * and waits for a response. It also monitors irqs while this is + * happening, in hope of automatically determining which one is + * being used by the interface. + * + * Returns: 0 device was identified + * 1 device timed-out (no response to identify request) + * 2 device aborted the command (refused to identify itself) + */ + +static int actual_try_to_identify (ide_drive_t *drive, u8 cmd) +{ + ide_hwif_t *hwif = HWIF(drive); + int rc; + unsigned long hd_status; + unsigned long timeout; + u8 s = 0, a = 0; + + /* take a deep breath */ + msleep(50); + + if (IDE_CONTROL_REG) { + a = hwif->INB(IDE_ALTSTATUS_REG); + s = hwif->INB(IDE_STATUS_REG); + if ((a ^ s) & ~INDEX_STAT) { + printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of " + "ALTSTATUS(0x%02x)\n", drive->name, s, a); + /* ancient Seagate drives, broken interfaces */ + hd_status = IDE_STATUS_REG; + } else { + /* use non-intrusive polling */ + hd_status = IDE_ALTSTATUS_REG; + } + } else + hd_status = IDE_STATUS_REG; + + /* set features register for atapi + * identify command to be sure of reply + */ + if ((cmd == WIN_PIDENTIFY)) + /* disable dma & overlap */ + hwif->OUTB(0, IDE_FEATURE_REG); + + /* ask drive for ID */ + hwif->OUTB(cmd, IDE_COMMAND_REG); + + timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2; + timeout += jiffies; + do { + if (time_after(jiffies, timeout)) { + /* drive timed-out */ + return 1; + } + /* give drive a breather */ + msleep(50); + } while ((hwif->INB(hd_status)) & BUSY_STAT); + + /* wait for IRQ and DRQ_STAT */ + msleep(50); + if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) { + unsigned long flags; + + /* local CPU only; some systems need this */ + local_irq_save(flags); + /* drive returned ID */ + do_identify(drive, cmd); + /* drive responded with ID */ + rc = 0; + /* clear drive IRQ */ + (void) hwif->INB(IDE_STATUS_REG); + local_irq_restore(flags); + } else { + /* drive refused ID */ + rc = 2; + } + return rc; +} + +/** + * try_to_identify - try to identify a drive + * @drive: drive to probe + * @cmd: command to use + * + * Issue the identify command and then do IRQ probing to + * complete the identification when needed by finding the + * IRQ the drive is attached to + */ + +static int try_to_identify (ide_drive_t *drive, u8 cmd) +{ + ide_hwif_t *hwif = HWIF(drive); + int retval; + int autoprobe = 0; + unsigned long cookie = 0; + + /* + * Disable device irq unless we need to + * probe for it. Otherwise we'll get spurious + * interrupts during the identify-phase that + * the irq handler isn't expecting. + */ + if (IDE_CONTROL_REG) { + u8 ctl = drive->ctl | 2; + if (!hwif->irq) { + autoprobe = 1; + cookie = probe_irq_on(); + /* enable device irq */ + ctl &= ~2; + } + hwif->OUTB(ctl, IDE_CONTROL_REG); + } + + retval = actual_try_to_identify(drive, cmd); + + if (autoprobe) { + int irq; + /* mask device irq */ + hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG); + /* clear drive IRQ */ + (void) hwif->INB(IDE_STATUS_REG); + udelay(5); + irq = probe_irq_off(cookie); + if (!hwif->irq) { + if (irq > 0) { + hwif->irq = irq; + } else { + /* Mmmm.. multiple IRQs.. + * don't know which was ours + */ + printk("%s: IRQ probe failed (0x%lx)\n", + drive->name, cookie); + } + } + } + return retval; +} + + +/** + * 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) +{ + int rc; + ide_hwif_t *hwif = HWIF(drive); + + if (drive->present) { + /* avoid waiting for inappropriate probes */ + if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY)) + return 4; + } +#ifdef DEBUG + printk("probing for %s: present=%d, media=%d, probetype=%s\n", + drive->name, drive->present, drive->media, + (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI"); +#endif + + /* needed for some systems + * (e.g. crw9624 as drive0 with disk as slave) + */ + msleep(50); + SELECT_DRIVE(drive); + msleep(50); + if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) { + if (drive->select.b.unit != 0) { + /* exit with drive0 selected */ + SELECT_DRIVE(&hwif->drives[0]); + /* allow BUSY_STAT to assert & clear */ + msleep(50); + } + /* no i/f present: mmm.. this should be a 4 -ml */ + return 3; + } + + if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) || + drive->present || cmd == WIN_PIDENTIFY) { + /* send cmd and wait */ + if ((rc = try_to_identify(drive, cmd))) { + /* failed: try again */ + rc = try_to_identify(drive,cmd); + } + if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT)) + return 4; + + if ((rc == 1 && cmd == WIN_PIDENTIFY) && + ((drive->autotune == IDE_TUNE_DEFAULT) || + (drive->autotune == IDE_TUNE_AUTO))) { + unsigned long timeout; + printk("%s: no response (status = 0x%02x), " + "resetting drive\n", drive->name, + hwif->INB(IDE_STATUS_REG)); + msleep(50); + hwif->OUTB(drive->select.all, IDE_SELECT_REG); + msleep(50); + hwif->OUTB(WIN_SRST, IDE_COMMAND_REG); + timeout = jiffies; + while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && + time_before(jiffies, timeout + WAIT_WORSTCASE)) + msleep(50); + rc = try_to_identify(drive, cmd); + } + if (rc == 1) + printk("%s: no response (status = 0x%02x)\n", + drive->name, hwif->INB(IDE_STATUS_REG)); + /* ensure drive irq is clear */ + (void) hwif->INB(IDE_STATUS_REG); + } else { + /* not present or maybe ATAPI */ + rc = 3; + } + if (drive->select.b.unit != 0) { + /* exit with drive0 selected */ + SELECT_DRIVE(&hwif->drives[0]); + msleep(50); + /* ensure drive irq is clear */ + (void) hwif->INB(IDE_STATUS_REG); + } + return rc; +} + +/* + * + */ +static void enable_nest (ide_drive_t *drive) +{ + ide_hwif_t *hwif = HWIF(drive); + unsigned long timeout; + + printk("%s: enabling %s -- ", hwif->name, drive->id->model); + SELECT_DRIVE(drive); + msleep(50); + hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG); + timeout = jiffies + WAIT_WORSTCASE; + do { + if (time_after(jiffies, timeout)) { + printk("failed (timeout)\n"); + return; + } + msleep(50); + } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT); + + msleep(50); + + if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) { + printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG)); + } else { + printk("success\n"); + } + + /* if !(success||timed-out) */ + if (do_probe(drive, WIN_IDENTIFY) >= 2) { + /* look for ATAPI device */ + (void) do_probe(drive, WIN_PIDENTIFY); + } +} + +/** + * 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: drive->present might + * still be 0) + */ + +static inline u8 probe_for_drive (ide_drive_t *drive) +{ + /* + * 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 = kmalloc(SECTOR_WORDS *4, GFP_KERNEL); + drive->id_read = 0; + if(drive->id == NULL) + { + printk(KERN_ERR "ide: out of memory for id data.\n"); + return 0; + } + memset(drive->id, 0, SECTOR_WORDS * 4); + strcpy(drive->id->model, "UNKNOWN"); + + /* skip probing? */ + if (!drive->noprobe) + { + /* if !(success||timed-out) */ + if (do_probe(drive, WIN_IDENTIFY) >= 2) { + /* look for ATAPI device */ + (void) do_probe(drive, WIN_PIDENTIFY); + } + if (strstr(drive->id->model, "E X A B Y T E N E S T")) + enable_nest(drive); + if (!drive->present) + /* drive not found */ + return 0; + + /* identification failed? */ + if (!drive->id_read) { + 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->present = 0; + } + } + /* drive was found */ + } + if(!drive->present) + return 0; + /* The drive wasn't being helpful. Add generic info only */ + if (drive->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 drive->present; +} + +static void hwif_release_dev (struct device *dev) +{ + ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev); + + up(&hwif->gendev_rel_sem); +} + +static void hwif_register (ide_hwif_t *hwif) +{ + /* register with global device tree */ + strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE); + hwif->gendev.driver_data = hwif; + if (hwif->gendev.parent == NULL) { + if (hwif->pci_dev) + hwif->gendev.parent = &hwif->pci_dev->dev; + else + /* Would like to do = &device_legacy */ + hwif->gendev.parent = NULL; + } + hwif->gendev.release = hwif_release_dev; + device_register(&hwif->gendev); +} + +static int wait_hwif_ready(ide_hwif_t *hwif) +{ + int 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 */ + SELECT_DRIVE(&hwif->drives[0]); + hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]); + mdelay(2); + rc = ide_wait_not_busy(hwif, 10000); + if (rc) + return rc; + SELECT_DRIVE(&hwif->drives[1]); + hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]); + mdelay(2); + rc = ide_wait_not_busy(hwif, 10000); + + /* Exit function with master reselected (let's be sane) */ + SELECT_DRIVE(&hwif->drives[0]); + + return rc; +} + +/** + * ide_undecoded_slave - look for bad CF adapters + * @hwif: interface + * + * 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_hwif_t *hwif) +{ + ide_drive_t *drive0 = &hwif->drives[0]; + ide_drive_t *drive1 = &hwif->drives[1]; + + if (drive0->present == 0 || drive1->present == 0) + return; + + /* If the models don't match they are not the same product */ + if (strcmp(drive0->id->model, drive1->id->model)) + return; + + /* Serial numbers do not match */ + if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20)) + return; + + /* No serial number, thankfully very rare for CF */ + if (drive0->id->serial_no[0] == 0) + return; + + /* Appears to be an IDE flash adapter with decode bugs */ + printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n"); + + drive1->present = 0; +} + +EXPORT_SYMBOL_GPL(ide_undecoded_slave); + +/* + * This routine only knows how to look for drive units 0 and 1 + * on an interface, so any setting of MAX_DRIVES > 2 won't work here. + */ +static void probe_hwif(ide_hwif_t *hwif) +{ + unsigned int unit; + unsigned long flags; + unsigned int irqd; + + if (hwif->noprobe) + return; + + if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) && + (ide_hwif_request_regions(hwif))) { + u16 msgout = 0; + for (unit = 0; unit < MAX_DRIVES; ++unit) { + ide_drive_t *drive = &hwif->drives[unit]; + if (drive->present) { + drive->present = 0; + printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n", + drive->name); + msgout = 1; + } + } + if (!msgout) + printk(KERN_ERR "%s: ports already in use, skipping probe\n", + hwif->name); + return; + } + + /* + * 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); + + local_irq_set(flags); + + /* 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-busy should not harm any existing configuration + * (at least things won't be worse than what current code does, that + * is blindly go & talk to the drive) and fix some issues like the + * above. + * + * BenH. + */ + if (wait_hwif_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. + */ + for (unit = 0; unit < MAX_DRIVES; ++unit) { + ide_drive_t *drive = &hwif->drives[unit]; + drive->dn = (hwif->channel ? 2 : 0) + unit; + (void) probe_for_drive(drive); + if (drive->present && !hwif->present) { + hwif->present = 1; + if (hwif->chipset != ide_4drives || + !hwif->mate || + !hwif->mate->present) { + hwif_register(hwif); + } + } + } + if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) { + unsigned long timeout = jiffies + WAIT_WORSTCASE; + u8 stat; + + printk(KERN_WARNING "%s: reset\n", hwif->name); + hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]); + udelay(10); + hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]); + do { + msleep(50); + stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]); + } while ((stat & BUSY_STAT) && time_after(timeout, jiffies)); + + } + local_irq_restore(flags); + /* + * Use cached IRQ number. It might be (and is...) changed by probe + * code above + */ + if (irqd) + enable_irq(irqd); + + if (!hwif->present) { + ide_hwif_release_regions(hwif); + return; + } + + for (unit = 0; unit < MAX_DRIVES; ++unit) { + ide_drive_t *drive = &hwif->drives[unit]; + + if (drive->present) { + if (hwif->tuneproc != NULL && + drive->autotune == IDE_TUNE_AUTO) + /* auto-tune PIO mode */ + hwif->tuneproc(drive, 255); + + if (drive->autotune != IDE_TUNE_DEFAULT && + drive->autotune != IDE_TUNE_AUTO) + continue; + + drive->nice1 = 1; + + /* + * MAJOR HACK BARF :-/ + * + * FIXME: chipsets own this cruft! + */ + /* + * Move here to prevent module loading clashing. + */ + // drive->autodma = hwif->autodma; + if (hwif->ide_dma_check) { + /* + * Force DMAing for the beginning of the check. + * Some chipsets appear to do interesting + * things, if not checked and cleared. + * PARANOIA!!! + */ + hwif->ide_dma_off_quietly(drive); +#ifdef CONFIG_IDEDMA_ONLYDISK + if (drive->media == ide_disk) +#endif + hwif->ide_dma_check(drive); + } + } + } +} + +static int hwif_init(ide_hwif_t *hwif); + +int probe_hwif_init_with_fixup(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif)) +{ + probe_hwif(hwif); + + if (fixup) + fixup(hwif); + + if (!hwif_init(hwif)) { + printk(KERN_INFO "%s: failed to initialize IDE interface\n", + hwif->name); + return -1; + } + + if (hwif->present) { + u16 unit = 0; + for (unit = 0; unit < MAX_DRIVES; ++unit) { + ide_drive_t *drive = &hwif->drives[unit]; + /* For now don't attach absent drives, we may + want them on default or a new "empty" class + for hotplug reprobing ? */ + if (drive->present) { + ata_attach(drive); + } + } + } + return 0; +} + +int probe_hwif_init(ide_hwif_t *hwif) +{ + return probe_hwif_init_with_fixup(hwif, NULL); +} + +EXPORT_SYMBOL(probe_hwif_init); + +#if MAX_HWIFS > 1 +/* + * save_match() is used to simplify logic in init_irq() below. + * + * A loophole here is that we may not know about a particular + * hwif's irq until after that hwif is actually probed/initialized.. + * This could be a problem for the case where an hwif is on a + * dual interface that requires serialization (eg. cmd640) and another + * hwif using one of the same irqs is initialized beforehand. + * + * This routine detects and reports such situations, but does not fix them. + */ +static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match) +{ + ide_hwif_t *m = *match; + + if (m && m->hwgroup && m->hwgroup != new->hwgroup) { + if (!new->hwgroup) + return; + printk("%s: potential irq problem with %s and %s\n", + hwif->name, new->name, m->name); + } + if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */ + *match = new; +} +#endif /* MAX_HWIFS > 1 */ + +/* + * init request queue + */ +static int ide_init_queue(ide_drive_t *drive) +{ + request_queue_t *q; + ide_hwif_t *hwif = HWIF(drive); + 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(do_ide_request, &ide_lock); + if (!q) + return 1; + + q->queuedata = drive; + blk_queue_segment_boundary(q, 0xffff); + + if (!hwif->rqsize) { + if (hwif->no_lba48 || hwif->no_lba48_dma) + hwif->rqsize = 256; + else + hwif->rqsize = 65536; + } + if (hwif->rqsize < max_sectors) + max_sectors = hwif->rqsize; + blk_queue_max_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_hw_segments(q, max_sg_entries); + blk_queue_max_phys_segments(q, max_sg_entries); + + /* assign drive queue */ + drive->queue = q; + + /* needs drive->queue to be set */ + ide_toggle_bounce(drive, 1); + + /* enable led activity for disk drives only */ + if (drive->media == ide_disk && hwif->led_act) + blk_queue_activity_fn(q, hwif->led_act, drive); + + return 0; +} + +/* + * This routine sets up the irq for an ide interface, and creates a new + * hwgroup for the irq/hwif if none was previously assigned. + * + * Much of the code is for correctly detecting/handling irq sharing + * and irq serialization situations. This is somewhat complex because + * it handles static as well as dynamic (PCMCIA) IDE interfaces. + * + * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with + * interrupts completely disabled. This can be bad for interrupt latency, + * but anything else has led to problems on some machines. We re-enable + * interrupts as much as we can safely do in most places. + */ +static int init_irq (ide_hwif_t *hwif) +{ + unsigned int index; + ide_hwgroup_t *hwgroup; + ide_hwif_t *match = NULL; + + + BUG_ON(in_interrupt()); + BUG_ON(irqs_disabled()); + down(&ide_cfg_sem); + hwif->hwgroup = NULL; +#if MAX_HWIFS > 1 + /* + * Group up with any other hwifs that share our irq(s). + */ + for (index = 0; index < MAX_HWIFS; index++) { + ide_hwif_t *h = &ide_hwifs[index]; + if (h->hwgroup) { /* scan only initialized hwif's */ + if (hwif->irq == h->irq) { + hwif->sharing_irq = h->sharing_irq = 1; + if (hwif->chipset != ide_pci || + h->chipset != ide_pci) { + save_match(hwif, h, &match); + } + } + if (hwif->serialized) { + if (hwif->mate && hwif->mate->irq == h->irq) + save_match(hwif, h, &match); + } + if (h->serialized) { + if (h->mate && hwif->irq == h->mate->irq) + save_match(hwif, h, &match); + } + } + } +#endif /* MAX_HWIFS > 1 */ + /* + * If we are still without a hwgroup, then form a new one + */ + if (match) { + hwgroup = match->hwgroup; + hwif->hwgroup = hwgroup; + /* + * Link us into the hwgroup. + * This must be done early, do ensure that unexpected_intr + * can find the hwif and prevent irq storms. + * No drives are attached to the new hwif, choose_drive + * can't do anything stupid (yet). + * Add ourself as the 2nd entry to the hwgroup->hwif + * linked list, the first entry is the hwif that owns + * hwgroup->handler - do not change that. + */ + spin_lock_irq(&ide_lock); + hwif->next = hwgroup->hwif->next; + hwgroup->hwif->next = hwif; + spin_unlock_irq(&ide_lock); + } else { + hwgroup = kmalloc(sizeof(ide_hwgroup_t),GFP_KERNEL); + if (!hwgroup) + goto out_up; + + hwif->hwgroup = hwgroup; + + memset(hwgroup, 0, sizeof(ide_hwgroup_t)); + hwgroup->hwif = hwif->next = hwif; + hwgroup->rq = NULL; + hwgroup->handler = NULL; + hwgroup->drive = NULL; + hwgroup->busy = 0; + init_timer(&hwgroup->timer); + hwgroup->timer.function = &ide_timer_expiry; + hwgroup->timer.data = (unsigned long) hwgroup; + } + + /* + * Allocate the irq, if not already obtained for another hwif + */ + if (!match || match->irq != hwif->irq) { + int sa = SA_INTERRUPT; +#if defined(__mc68000__) || defined(CONFIG_APUS) + sa = SA_SHIRQ; +#endif /* __mc68000__ || CONFIG_APUS */ + + if (IDE_CHIPSET_IS_PCI(hwif->chipset)) { + sa = SA_SHIRQ; +#ifndef CONFIG_IDEPCI_SHARE_IRQ + sa |= SA_INTERRUPT; +#endif /* CONFIG_IDEPCI_SHARE_IRQ */ + } + + if (hwif->io_ports[IDE_CONTROL_OFFSET]) + /* clear nIEN */ + hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]); + + if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup)) + goto out_unlink; + } + + /* + * For any present drive: + * - allocate the block device queue + * - link drive into the hwgroup + */ + for (index = 0; index < MAX_DRIVES; ++index) { + ide_drive_t *drive = &hwif->drives[index]; + if (!drive->present) + continue; + if (ide_init_queue(drive)) { + printk(KERN_ERR "ide: failed to init %s\n",drive->name); + continue; + } + spin_lock_irq(&ide_lock); + if (!hwgroup->drive) { + /* first drive for hwgroup. */ + drive->next = drive; + hwgroup->drive = drive; + hwgroup->hwif = HWIF(hwgroup->drive); + } else { + drive->next = hwgroup->drive->next; + hwgroup->drive->next = drive; + } + spin_unlock_irq(&ide_lock); + } + +#if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__) + printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name, + hwif->io_ports[IDE_DATA_OFFSET], + hwif->io_ports[IDE_DATA_OFFSET]+7, + hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq); +#elif defined(__sparc__) + printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name, + hwif->io_ports[IDE_DATA_OFFSET], + hwif->io_ports[IDE_DATA_OFFSET]+7, + hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq)); +#else + printk("%s at 0x%08lx on irq %d", hwif->name, + hwif->io_ports[IDE_DATA_OFFSET], hwif->irq); +#endif /* __mc68000__ && CONFIG_APUS */ + if (match) + printk(" (%sed with %s)", + hwif->sharing_irq ? "shar" : "serializ", match->name); + printk("\n"); + up(&ide_cfg_sem); + return 0; +out_unlink: + spin_lock_irq(&ide_lock); + if (hwif->next == hwif) { + BUG_ON(match); + BUG_ON(hwgroup->hwif != hwif); + kfree(hwgroup); + } else { + ide_hwif_t *g; + g = hwgroup->hwif; + while (g->next != hwif) + g = g->next; + g->next = hwif->next; + if (hwgroup->hwif == hwif) { + /* Impossible. */ + printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n"); + hwgroup->hwif = g; + } + BUG_ON(hwgroup->hwif == hwif); + } + spin_unlock_irq(&ide_lock); +out_up: + up(&ide_cfg_sem); + 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->drives[unit]; + if (!drive->present) + return NULL; + + if (drive->media == ide_disk) + request_module("ide-disk"); + if (drive->scsi) + request_module("ide-scsi"); + 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 &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->select.all >> 4) & 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); + + up(&drive->gendev_rel_sem); +} + +/* + * init_gendisk() (as opposed to ide_geninit) is called for each major device, + * after probing for drives, to allocate partition tables and other data + * structures needed for the routines in genhd.c. ide_geninit() gets called + * somewhat later, during the partition check. + */ +static void init_gendisk (ide_hwif_t *hwif) +{ + unsigned int unit; + + for (unit = 0; unit < MAX_DRIVES; ++unit) { + ide_drive_t * drive = &hwif->drives[unit]; + ide_add_generic_settings(drive); + snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u", + hwif->index,unit); + drive->gendev.parent = &hwif->gendev; + drive->gendev.bus = &ide_bus_type; + drive->gendev.driver_data = drive; + drive->gendev.release = drive_release_dev; + if (drive->present) { + device_register(&drive->gendev); + sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d", + (hwif->channel && hwif->mate) ? + hwif->mate->index : hwif->index, + hwif->channel, unit, drive->lun); + } + } + blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS, + THIS_MODULE, ata_probe, ata_lock, hwif); +} + +static int hwif_init(ide_hwif_t *hwif) +{ + int old_irq; + + /* Return success if no device is connected */ + if (!hwif->present) + return 1; + + if (!hwif->irq) { + if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) + { + printk("%s: DISABLED, NO IRQ\n", hwif->name); + return (hwif->present = 0); + } + } +#ifdef CONFIG_BLK_DEV_HD + if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) { + printk("%s: CANNOT SHARE IRQ WITH OLD " + "HARDDISK DRIVER (hd.c)\n", hwif->name); + return (hwif->present = 0); + } +#endif /* CONFIG_BLK_DEV_HD */ + + /* we set it back to 1 if all is ok below */ + hwif->present = 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; + } + + if (init_irq(hwif) == 0) + goto done; + + old_irq = hwif->irq; + /* + * It failed to initialise. Find the default IRQ for + * this port and try that. + */ + if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) { + printk("%s: Disabled unable to get IRQ %d.\n", + hwif->name, old_irq); + goto out; + } + if (init_irq(hwif)) { + printk("%s: probed IRQ %d and default IRQ %d failed.\n", + hwif->name, old_irq, hwif->irq); + goto out; + } + printk("%s: probed IRQ %d failed, using default.\n", + hwif->name, hwif->irq); + +done: + init_gendisk(hwif); + hwif->present = 1; /* success */ + return 1; + +out: + unregister_blkdev(hwif->major, hwif->name); + return 0; +} + +int ideprobe_init (void) +{ + unsigned int index; + int probe[MAX_HWIFS]; + + memset(probe, 0, MAX_HWIFS * sizeof(int)); + for (index = 0; index < MAX_HWIFS; ++index) + probe[index] = !ide_hwifs[index].present; + + for (index = 0; index < MAX_HWIFS; ++index) + if (probe[index]) + probe_hwif(&ide_hwifs[index]); + for (index = 0; index < MAX_HWIFS; ++index) + if (probe[index]) + hwif_init(&ide_hwifs[index]); + for (index = 0; index < MAX_HWIFS; ++index) { + if (probe[index]) { + ide_hwif_t *hwif = &ide_hwifs[index]; + int unit; + if (!hwif->present) + continue; + if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced) + hwif->chipset = ide_generic; + for (unit = 0; unit < MAX_DRIVES; ++unit) + if (hwif->drives[unit].present) + ata_attach(&hwif->drives[unit]); + } + } + return 0; +} + +EXPORT_SYMBOL_GPL(ideprobe_init); |