diff options
Diffstat (limited to 'drivers/ide/ide-iops.c')
| -rw-r--r-- | drivers/ide/ide-iops.c | 536 |
1 files changed, 536 insertions, 0 deletions
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c new file mode 100644 index 000000000..f2be127ee --- /dev/null +++ b/drivers/ide/ide-iops.c @@ -0,0 +1,536 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org> + * Copyright (C) 2003 Red Hat + * + */ + +#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/blkpg.h> +#include <linux/slab.h> +#include <linux/pci.h> +#include <linux/delay.h> +#include <linux/ide.h> +#include <linux/bitops.h> +#include <linux/nmi.h> + +#include <asm/byteorder.h> +#include <asm/irq.h> +#include <linux/uaccess.h> +#include <asm/io.h> + +void SELECT_MASK(ide_drive_t *drive, int mask) +{ + const struct ide_port_ops *port_ops = drive->hwif->port_ops; + + if (port_ops && port_ops->maskproc) + port_ops->maskproc(drive, mask); +} + +u8 ide_read_error(ide_drive_t *drive) +{ + struct ide_taskfile tf; + + drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_ERROR); + + return tf.error; +} +EXPORT_SYMBOL_GPL(ide_read_error); + +void ide_fix_driveid(u16 *id) +{ +#ifndef __LITTLE_ENDIAN +# ifdef __BIG_ENDIAN + int i; + + for (i = 0; i < 256; i++) + id[i] = __le16_to_cpu(id[i]); +# else +# error "Please fix <asm/byteorder.h>" +# endif +#endif +} + +/* + * ide_fixstring() cleans up and (optionally) byte-swaps a text string, + * removing leading/trailing blanks and compressing internal blanks. + * It is primarily used to tidy up the model name/number fields as + * returned by the ATA_CMD_ID_ATA[PI] commands. + */ + +void ide_fixstring(u8 *s, const int bytecount, const int byteswap) +{ + u8 *p, *end = &s[bytecount & ~1]; /* bytecount must be even */ + + if (byteswap) { + /* convert from big-endian to host byte order */ + for (p = s ; p != end ; p += 2) + be16_to_cpus((u16 *) p); + } + + /* strip leading blanks */ + p = s; + while (s != end && *s == ' ') + ++s; + /* compress internal blanks and strip trailing blanks */ + while (s != end && *s) { + if (*s++ != ' ' || (s != end && *s && *s != ' ')) + *p++ = *(s-1); + } + /* wipe out trailing garbage */ + while (p != end) + *p++ = '\0'; +} +EXPORT_SYMBOL(ide_fixstring); + +/* + * This routine busy-waits for the drive status to be not "busy". + * It then checks the status for all of the "good" bits and none + * of the "bad" bits, and if all is okay it returns 0. All other + * cases return error -- caller may then invoke ide_error(). + * + * This routine should get fixed to not hog the cpu during extra long waits.. + * That could be done by busy-waiting for the first jiffy or two, and then + * setting a timer to wake up at half second intervals thereafter, + * until timeout is achieved, before timing out. + */ +int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, + unsigned long timeout, u8 *rstat) +{ + ide_hwif_t *hwif = drive->hwif; + const struct ide_tp_ops *tp_ops = hwif->tp_ops; + unsigned long flags; + bool irqs_threaded = force_irqthreads; + int i; + u8 stat; + + udelay(1); /* spec allows drive 400ns to assert "BUSY" */ + stat = tp_ops->read_status(hwif); + + if (stat & ATA_BUSY) { + if (!irqs_threaded) { + local_save_flags(flags); + local_irq_enable_in_hardirq(); + } + timeout += jiffies; + while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) { + if (time_after(jiffies, timeout)) { + /* + * One last read after the timeout in case + * heavy interrupt load made us not make any + * progress during the timeout.. + */ + stat = tp_ops->read_status(hwif); + if ((stat & ATA_BUSY) == 0) + break; + + if (!irqs_threaded) + local_irq_restore(flags); + *rstat = stat; + return -EBUSY; + } + } + if (!irqs_threaded) + local_irq_restore(flags); + } + /* + * Allow status to settle, then read it again. + * A few rare drives vastly violate the 400ns spec here, + * so we'll wait up to 10usec for a "good" status + * rather than expensively fail things immediately. + * This fix courtesy of Matthew Faupel & Niccolo Rigacci. + */ + for (i = 0; i < 10; i++) { + udelay(1); + stat = tp_ops->read_status(hwif); + + if (OK_STAT(stat, good, bad)) { + *rstat = stat; + return 0; + } + } + *rstat = stat; + return -EFAULT; +} + +/* + * In case of error returns error value after doing "*startstop = ide_error()". + * The caller should return the updated value of "startstop" in this case, + * "startstop" is unchanged when the function returns 0. + */ +int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, + u8 bad, unsigned long timeout) +{ + int err; + u8 stat; + + /* bail early if we've exceeded max_failures */ + if (drive->max_failures && (drive->failures > drive->max_failures)) { + *startstop = ide_stopped; + return 1; + } + + err = __ide_wait_stat(drive, good, bad, timeout, &stat); + + if (err) { + char *s = (err == -EBUSY) ? "status timeout" : "status error"; + *startstop = ide_error(drive, s, stat); + } + + return err; +} +EXPORT_SYMBOL(ide_wait_stat); + +/** + * ide_in_drive_list - look for drive in black/white list + * @id: drive identifier + * @table: list to inspect + * + * Look for a drive in the blacklist and the whitelist tables + * Returns 1 if the drive is found in the table. + */ + +int ide_in_drive_list(u16 *id, const struct drive_list_entry *table) +{ + for ( ; table->id_model; table++) + if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) && + (!table->id_firmware || + strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware))) + return 1; + return 0; +} +EXPORT_SYMBOL_GPL(ide_in_drive_list); + +/* + * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid. + * Some optical devices with the buggy firmwares have the same problem. + */ +static const struct drive_list_entry ivb_list[] = { + { "QUANTUM FIREBALLlct10 05" , "A03.0900" }, + { "QUANTUM FIREBALLlct20 30" , "APL.0900" }, + { "TSSTcorp CDDVDW SH-S202J" , "SB00" }, + { "TSSTcorp CDDVDW SH-S202J" , "SB01" }, + { "TSSTcorp CDDVDW SH-S202N" , "SB00" }, + { "TSSTcorp CDDVDW SH-S202N" , "SB01" }, + { "TSSTcorp CDDVDW SH-S202H" , "SB00" }, + { "TSSTcorp CDDVDW SH-S202H" , "SB01" }, + { "SAMSUNG SP0822N" , "WA100-10" }, + { NULL , NULL } +}; + +/* + * All hosts that use the 80c ribbon must use! + * The name is derived from upper byte of word 93 and the 80c ribbon. + */ +u8 eighty_ninty_three(ide_drive_t *drive) +{ + ide_hwif_t *hwif = drive->hwif; + u16 *id = drive->id; + int ivb = ide_in_drive_list(id, ivb_list); + + if (hwif->cbl == ATA_CBL_SATA || hwif->cbl == ATA_CBL_PATA40_SHORT) + return 1; + + if (ivb) + printk(KERN_DEBUG "%s: skipping word 93 validity check\n", + drive->name); + + if (ata_id_is_sata(id) && !ivb) + return 1; + + if (hwif->cbl != ATA_CBL_PATA80 && !ivb) + goto no_80w; + + /* + * FIXME: + * - change master/slave IDENTIFY order + * - force bit13 (80c cable present) check also for !ivb devices + * (unless the slave device is pre-ATA3) + */ + if (id[ATA_ID_HW_CONFIG] & 0x4000) + return 1; + + if (ivb) { + const char *model = (char *)&id[ATA_ID_PROD]; + + if (strstr(model, "TSSTcorp CDDVDW SH-S202")) { + /* + * These ATAPI devices always report 80c cable + * so we have to depend on the host in this case. + */ + if (hwif->cbl == ATA_CBL_PATA80) + return 1; + } else { + /* Depend on the device side cable detection. */ + if (id[ATA_ID_HW_CONFIG] & 0x2000) + return 1; + } + } +no_80w: + if (drive->dev_flags & IDE_DFLAG_UDMA33_WARNED) + return 0; + + printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, " + "limiting max speed to UDMA33\n", + drive->name, + hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host"); + + drive->dev_flags |= IDE_DFLAG_UDMA33_WARNED; + + return 0; +} + +static const char *nien_quirk_list[] = { + "QUANTUM FIREBALLlct08 08", + "QUANTUM FIREBALLP KA6.4", + "QUANTUM FIREBALLP KA9.1", + "QUANTUM FIREBALLP KX13.6", + "QUANTUM FIREBALLP KX20.5", + "QUANTUM FIREBALLP KX27.3", + "QUANTUM FIREBALLP LM20.4", + "QUANTUM FIREBALLP LM20.5", + "FUJITSU MHZ2160BH G2", + NULL +}; + +void ide_check_nien_quirk_list(ide_drive_t *drive) +{ + const char **list, *m = (char *)&drive->id[ATA_ID_PROD]; + + for (list = nien_quirk_list; *list != NULL; list++) + if (strstr(m, *list) != NULL) { + drive->dev_flags |= IDE_DFLAG_NIEN_QUIRK; + return; + } +} + +int ide_driveid_update(ide_drive_t *drive) +{ + u16 *id; + int rc; + + id = kmalloc(SECTOR_SIZE, GFP_ATOMIC); + if (id == NULL) + return 0; + + SELECT_MASK(drive, 1); + rc = ide_dev_read_id(drive, ATA_CMD_ID_ATA, id, 1); + SELECT_MASK(drive, 0); + + if (rc) + goto out_err; + + drive->id[ATA_ID_UDMA_MODES] = id[ATA_ID_UDMA_MODES]; + drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES]; + drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES]; + drive->id[ATA_ID_CFA_MODES] = id[ATA_ID_CFA_MODES]; + /* anything more ? */ + + kfree(id); + + return 1; +out_err: + if (rc == 2) + printk(KERN_ERR "%s: %s: bad status\n", drive->name, __func__); + kfree(id); + return 0; +} + +int ide_config_drive_speed(ide_drive_t *drive, u8 speed) +{ + ide_hwif_t *hwif = drive->hwif; + const struct ide_tp_ops *tp_ops = hwif->tp_ops; + struct ide_taskfile tf; + u16 *id = drive->id, i; + int error = 0; + u8 stat; + +#ifdef CONFIG_BLK_DEV_IDEDMA + if (hwif->dma_ops) /* check if host supports DMA */ + hwif->dma_ops->dma_host_set(drive, 0); +#endif + + /* Skip setting PIO flow-control modes on pre-EIDE drives */ + if ((speed & 0xf8) == XFER_PIO_0 && ata_id_has_iordy(drive->id) == 0) + goto skip; + + /* + * Don't use ide_wait_cmd here - it will + * attempt to set_geometry and recalibrate, + * but for some reason these don't work at + * this point (lost interrupt). + */ + + udelay(1); + tp_ops->dev_select(drive); + SELECT_MASK(drive, 1); + udelay(1); + tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS); + + memset(&tf, 0, sizeof(tf)); + tf.feature = SETFEATURES_XFER; + tf.nsect = speed; + + tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE | IDE_VALID_NSECT); + + tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES); + + if (drive->dev_flags & IDE_DFLAG_NIEN_QUIRK) + tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS); + + error = __ide_wait_stat(drive, drive->ready_stat, + ATA_BUSY | ATA_DRQ | ATA_ERR, + WAIT_CMD, &stat); + + SELECT_MASK(drive, 0); + + if (error) { + (void) ide_dump_status(drive, "set_drive_speed_status", stat); + return error; + } + + if (speed >= XFER_SW_DMA_0) { + id[ATA_ID_UDMA_MODES] &= ~0xFF00; + id[ATA_ID_MWDMA_MODES] &= ~0x0700; + id[ATA_ID_SWDMA_MODES] &= ~0x0700; + if (ata_id_is_cfa(id)) + id[ATA_ID_CFA_MODES] &= ~0x0E00; + } else if (ata_id_is_cfa(id)) + id[ATA_ID_CFA_MODES] &= ~0x01C0; + + skip: +#ifdef CONFIG_BLK_DEV_IDEDMA + if (speed >= XFER_SW_DMA_0 && (drive->dev_flags & IDE_DFLAG_USING_DMA)) + hwif->dma_ops->dma_host_set(drive, 1); + else if (hwif->dma_ops) /* check if host supports DMA */ + ide_dma_off_quietly(drive); +#endif + + if (speed >= XFER_UDMA_0) { + i = 1 << (speed - XFER_UDMA_0); + id[ATA_ID_UDMA_MODES] |= (i << 8 | i); + } else if (ata_id_is_cfa(id) && speed >= XFER_MW_DMA_3) { + i = speed - XFER_MW_DMA_2; + id[ATA_ID_CFA_MODES] |= i << 9; + } else if (speed >= XFER_MW_DMA_0) { + i = 1 << (speed - XFER_MW_DMA_0); + id[ATA_ID_MWDMA_MODES] |= (i << 8 | i); + } else if (speed >= XFER_SW_DMA_0) { + i = 1 << (speed - XFER_SW_DMA_0); + id[ATA_ID_SWDMA_MODES] |= (i << 8 | i); + } else if (ata_id_is_cfa(id) && speed >= XFER_PIO_5) { + i = speed - XFER_PIO_4; + id[ATA_ID_CFA_MODES] |= i << 6; + } + + if (!drive->init_speed) + drive->init_speed = speed; + drive->current_speed = speed; + return error; +} + +/* + * This should get invoked any time we exit the driver to + * wait for an interrupt response from a drive. handler() points + * at the appropriate code to handle the next interrupt, and a + * timer is started to prevent us from waiting forever in case + * something goes wrong (see the ide_timer_expiry() handler later on). + * + * See also ide_execute_command + */ +void __ide_set_handler(ide_drive_t *drive, ide_handler_t *handler, + unsigned int timeout) +{ + ide_hwif_t *hwif = drive->hwif; + + BUG_ON(hwif->handler); + hwif->handler = handler; + hwif->timer.expires = jiffies + timeout; + hwif->req_gen_timer = hwif->req_gen; + add_timer(&hwif->timer); +} + +void ide_set_handler(ide_drive_t *drive, ide_handler_t *handler, + unsigned int timeout) +{ + ide_hwif_t *hwif = drive->hwif; + unsigned long flags; + + spin_lock_irqsave(&hwif->lock, flags); + __ide_set_handler(drive, handler, timeout); + spin_unlock_irqrestore(&hwif->lock, flags); +} +EXPORT_SYMBOL(ide_set_handler); + +/** + * ide_execute_command - execute an IDE command + * @drive: IDE drive to issue the command against + * @cmd: command + * @handler: handler for next phase + * @timeout: timeout for command + * + * Helper function to issue an IDE command. This handles the + * atomicity requirements, command timing and ensures that the + * handler and IRQ setup do not race. All IDE command kick off + * should go via this function or do equivalent locking. + */ + +void ide_execute_command(ide_drive_t *drive, struct ide_cmd *cmd, + ide_handler_t *handler, unsigned timeout) +{ + ide_hwif_t *hwif = drive->hwif; + unsigned long flags; + + spin_lock_irqsave(&hwif->lock, flags); + if ((cmd->protocol != ATAPI_PROT_DMA && + cmd->protocol != ATAPI_PROT_PIO) || + (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT)) + __ide_set_handler(drive, handler, timeout); + hwif->tp_ops->exec_command(hwif, cmd->tf.command); + /* + * Drive takes 400nS to respond, we must avoid the IRQ being + * serviced before that. + * + * FIXME: we could skip this delay with care on non shared devices + */ + ndelay(400); + spin_unlock_irqrestore(&hwif->lock, flags); +} + +/* + * ide_wait_not_busy() waits for the currently selected device on the hwif + * to report a non-busy status, see comments in ide_probe_port(). + */ +int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout) +{ + u8 stat = 0; + + while (timeout--) { + /* + * Turn this into a schedule() sleep once I'm sure + * about locking issues (2.5 work ?). + */ + mdelay(1); + stat = hwif->tp_ops->read_status(hwif); + if ((stat & ATA_BUSY) == 0) + return 0; + /* + * Assume a value of 0xff means nothing is connected to + * the interface and it doesn't implement the pull-down + * resistor on D7. + */ + if (stat == 0xff) + return -ENODEV; + touch_nmi_watchdog(); + } + return -EBUSY; +} |