X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;ds=sidebyside;f=drivers%2Fide%2Fide-dma.c;h=ee58c88dee5a61f51d437d1f618fd89745144785;hb=b1bf9368407ae7e89d8a005bb40beb70a41df539;hp=15e608f52eba352c767d63f20ad85413d8867ac4;hpb=48fb2688aa67baba373531cc4ed2d9e695983c3f;p=safe%2Fjmp%2Flinux-2.6 diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c index 15e608f..ee58c88 100644 --- a/drivers/ide/ide-dma.c +++ b/drivers/ide/ide-dma.c @@ -28,24 +28,13 @@ * for supplying a Promise UDMA board & WD UDMA drive for this work! */ -#include #include #include -#include -#include -#include -#include -#include #include -#include #include #include -#include -#include - -static const struct drive_list_entry drive_whitelist [] = { - +static const struct drive_list_entry drive_whitelist[] = { { "Micropolis 2112A" , NULL }, { "CONNER CTMA 4000" , NULL }, { "CONNER CTT8000-A" , NULL }, @@ -53,8 +42,7 @@ static const struct drive_list_entry drive_whitelist [] = { { NULL , NULL } }; -static const struct drive_list_entry drive_blacklist [] = { - +static const struct drive_list_entry drive_blacklist[] = { { "WDC AC11000H" , NULL }, { "WDC AC22100H" , NULL }, { "WDC AC32500H" , NULL }, @@ -94,42 +82,45 @@ static const struct drive_list_entry drive_blacklist [] = { * ide_dma_intr - IDE DMA interrupt handler * @drive: the drive the interrupt is for * - * Handle an interrupt completing a read/write DMA transfer on an + * Handle an interrupt completing a read/write DMA transfer on an * IDE device */ - -ide_startstop_t ide_dma_intr (ide_drive_t *drive) + +ide_startstop_t ide_dma_intr(ide_drive_t *drive) { ide_hwif_t *hwif = drive->hwif; + struct ide_cmd *cmd = &hwif->cmd; u8 stat = 0, dma_stat = 0; + drive->waiting_for_dma = 0; dma_stat = hwif->dma_ops->dma_end(drive); + ide_dma_unmap_sg(drive, cmd); stat = hwif->tp_ops->read_status(hwif); - if (OK_STAT(stat,DRIVE_READY,drive->bad_wstat|DRQ_STAT)) { + if (OK_STAT(stat, DRIVE_READY, drive->bad_wstat | ATA_DRQ)) { if (!dma_stat) { - struct request *rq = HWGROUP(drive)->rq; - - task_end_request(drive, rq, stat); + if ((cmd->tf_flags & IDE_TFLAG_FS) == 0) + ide_finish_cmd(drive, cmd, stat); + else + ide_complete_rq(drive, 0, + blk_rq_sectors(cmd->rq) << 9); return ide_stopped; } - printk(KERN_ERR "%s: dma_intr: bad DMA status (dma_stat=%x)\n", - drive->name, dma_stat); + printk(KERN_ERR "%s: %s: bad DMA status (0x%02x)\n", + drive->name, __func__, dma_stat); } return ide_error(drive, "dma_intr", stat); } -EXPORT_SYMBOL_GPL(ide_dma_intr); - -static int ide_dma_good_drive(ide_drive_t *drive) +int ide_dma_good_drive(ide_drive_t *drive) { return ide_in_drive_list(drive->id, drive_whitelist); } /** - * ide_build_sglist - map IDE scatter gather for DMA I/O - * @drive: the drive to build the DMA table for - * @rq: the request holding the sg list + * ide_dma_map_sg - map IDE scatter gather for DMA I/O + * @drive: the drive to map the DMA table for + * @cmd: command * * Perform the DMA mapping magic necessary to access the source or * target buffers of a request via DMA. The lower layers of the @@ -137,123 +128,28 @@ static int ide_dma_good_drive(ide_drive_t *drive) * operate in a portable fashion. */ -int ide_build_sglist(ide_drive_t *drive, struct request *rq) +static int ide_dma_map_sg(ide_drive_t *drive, struct ide_cmd *cmd) { - ide_hwif_t *hwif = HWIF(drive); + ide_hwif_t *hwif = drive->hwif; struct scatterlist *sg = hwif->sg_table; - - ide_map_sg(drive, rq); - - if (rq_data_dir(rq) == READ) - hwif->sg_dma_direction = DMA_FROM_DEVICE; - else - hwif->sg_dma_direction = DMA_TO_DEVICE; - - return dma_map_sg(hwif->dev, sg, hwif->sg_nents, - hwif->sg_dma_direction); -} - -EXPORT_SYMBOL_GPL(ide_build_sglist); - -#ifdef CONFIG_BLK_DEV_IDEDMA_SFF -/** - * ide_build_dmatable - build IDE DMA table - * - * ide_build_dmatable() prepares a dma request. We map the command - * to get the pci bus addresses of the buffers and then build up - * the PRD table that the IDE layer wants to be fed. The code - * knows about the 64K wrap bug in the CS5530. - * - * Returns the number of built PRD entries if all went okay, - * returns 0 otherwise. - * - * May also be invoked from trm290.c - */ - -int ide_build_dmatable (ide_drive_t *drive, struct request *rq) -{ - ide_hwif_t *hwif = HWIF(drive); - __le32 *table = (__le32 *)hwif->dmatable_cpu; - unsigned int is_trm290 = (hwif->chipset == ide_trm290) ? 1 : 0; - unsigned int count = 0; int i; - struct scatterlist *sg; - - hwif->sg_nents = i = ide_build_sglist(drive, rq); - - if (!i) - return 0; - sg = hwif->sg_table; - while (i) { - u32 cur_addr; - u32 cur_len; - - cur_addr = sg_dma_address(sg); - cur_len = sg_dma_len(sg); - - /* - * Fill in the dma table, without crossing any 64kB boundaries. - * Most hardware requires 16-bit alignment of all blocks, - * but the trm290 requires 32-bit alignment. - */ - - while (cur_len) { - if (count++ >= PRD_ENTRIES) { - printk(KERN_ERR "%s: DMA table too small\n", drive->name); - goto use_pio_instead; - } else { - u32 xcount, bcount = 0x10000 - (cur_addr & 0xffff); - - if (bcount > cur_len) - bcount = cur_len; - *table++ = cpu_to_le32(cur_addr); - xcount = bcount & 0xffff; - if (is_trm290) - xcount = ((xcount >> 2) - 1) << 16; - else if (xcount == 0x0000) { - /* - * Most chipsets correctly interpret a length of 0x0000 as 64KB, - * but at least one (e.g. CS5530) misinterprets it as zero (!). - * So here we break the 64KB entry into two 32KB entries instead. - */ - if (count++ >= PRD_ENTRIES) { - printk(KERN_ERR "%s: DMA table too small\n", drive->name); - goto use_pio_instead; - } - *table++ = cpu_to_le32(0x8000); - *table++ = cpu_to_le32(cur_addr + 0x8000); - xcount = 0x8000; - } - *table++ = cpu_to_le32(xcount); - cur_addr += bcount; - cur_len -= bcount; - } - } - - sg = sg_next(sg); - i--; - } + if (cmd->tf_flags & IDE_TFLAG_WRITE) + cmd->sg_dma_direction = DMA_TO_DEVICE; + else + cmd->sg_dma_direction = DMA_FROM_DEVICE; - if (count) { - if (!is_trm290) - *--table |= cpu_to_le32(0x80000000); - return count; + i = dma_map_sg(hwif->dev, sg, cmd->sg_nents, cmd->sg_dma_direction); + if (i) { + cmd->orig_sg_nents = cmd->sg_nents; + cmd->sg_nents = i; } - printk(KERN_ERR "%s: empty DMA table?\n", drive->name); - -use_pio_instead: - ide_destroy_dmatable(drive); - - return 0; /* revert to PIO for this request */ + return i; } -EXPORT_SYMBOL_GPL(ide_build_dmatable); -#endif - /** - * ide_destroy_dmatable - clean up DMA mapping + * ide_dma_unmap_sg - clean up DMA mapping * @drive: The drive to unmap * * Teardown mappings after DMA has completed. This must be called @@ -262,147 +158,30 @@ EXPORT_SYMBOL_GPL(ide_build_dmatable); * an oops as only one mapping can be live for each target at a given * time. */ - -void ide_destroy_dmatable (ide_drive_t *drive) -{ - ide_hwif_t *hwif = drive->hwif; - - dma_unmap_sg(hwif->dev, hwif->sg_table, hwif->sg_nents, - hwif->sg_dma_direction); -} - -EXPORT_SYMBOL_GPL(ide_destroy_dmatable); -#ifdef CONFIG_BLK_DEV_IDEDMA_SFF -/** - * config_drive_for_dma - attempt to activate IDE DMA - * @drive: the drive to place in DMA mode - * - * If the drive supports at least mode 2 DMA or UDMA of any kind - * then attempt to place it into DMA mode. Drives that are known to - * support DMA but predate the DMA properties or that are known - * to have DMA handling bugs are also set up appropriately based - * on the good/bad drive lists. - */ - -static int config_drive_for_dma (ide_drive_t *drive) +void ide_dma_unmap_sg(ide_drive_t *drive, struct ide_cmd *cmd) { ide_hwif_t *hwif = drive->hwif; - u16 *id = drive->id; - - if (drive->media != ide_disk) { - if (hwif->host_flags & IDE_HFLAG_NO_ATAPI_DMA) - return 0; - } - - /* - * Enable DMA on any drive that has - * UltraDMA (mode 0/1/2/3/4/5/6) enabled - */ - if ((id[ATA_ID_FIELD_VALID] & 4) && - ((id[ATA_ID_UDMA_MODES] >> 8) & 0x7f)) - return 1; - - /* - * Enable DMA on any drive that has mode2 DMA - * (multi or single) enabled - */ - if (id[ATA_ID_FIELD_VALID] & 2) /* regular DMA */ - if ((id[ATA_ID_MWDMA_MODES] & 0x404) == 0x404 || - (id[ATA_ID_SWDMA_MODES] & 0x404) == 0x404) - return 1; - - /* Consult the list of known "good" drives */ - if (ide_dma_good_drive(drive)) - return 1; - return 0; + dma_unmap_sg(hwif->dev, hwif->sg_table, cmd->orig_sg_nents, + cmd->sg_dma_direction); } - -/** - * dma_timer_expiry - handle a DMA timeout - * @drive: Drive that timed out - * - * An IDE DMA transfer timed out. In the event of an error we ask - * the driver to resolve the problem, if a DMA transfer is still - * in progress we continue to wait (arguably we need to add a - * secondary 'I don't care what the drive thinks' timeout here) - * Finally if we have an interrupt we let it complete the I/O. - * But only one time - we clear expiry and if it's still not - * completed after WAIT_CMD, we error and retry in PIO. - * This can occur if an interrupt is lost or due to hang or bugs. - */ - -static int dma_timer_expiry (ide_drive_t *drive) -{ - ide_hwif_t *hwif = HWIF(drive); - u8 dma_stat = hwif->tp_ops->read_sff_dma_status(hwif); - - printk(KERN_WARNING "%s: dma_timer_expiry: dma status == 0x%02x\n", - drive->name, dma_stat); - - if ((dma_stat & 0x18) == 0x18) /* BUSY Stupid Early Timer !! */ - return WAIT_CMD; - - HWGROUP(drive)->expiry = NULL; /* one free ride for now */ - - /* 1 dmaing, 2 error, 4 intr */ - if (dma_stat & 2) /* ERROR */ - return -1; - - if (dma_stat & 1) /* DMAing */ - return WAIT_CMD; - - if (dma_stat & 4) /* Got an Interrupt */ - return WAIT_CMD; - - return 0; /* Status is unknown -- reset the bus */ -} - -/** - * ide_dma_host_set - Enable/disable DMA on a host - * @drive: drive to control - * - * Enable/disable DMA on an IDE controller following generic - * bus-mastering IDE controller behaviour. - */ - -void ide_dma_host_set(ide_drive_t *drive, int on) -{ - ide_hwif_t *hwif = HWIF(drive); - u8 unit = (drive->select.b.unit & 0x01); - u8 dma_stat = hwif->tp_ops->read_sff_dma_status(hwif); - - if (on) - dma_stat |= (1 << (5 + unit)); - else - dma_stat &= ~(1 << (5 + unit)); - - if (hwif->host_flags & IDE_HFLAG_MMIO) - writeb(dma_stat, - (void __iomem *)(hwif->dma_base + ATA_DMA_STATUS)); - else - outb(dma_stat, hwif->dma_base + ATA_DMA_STATUS); -} - -EXPORT_SYMBOL_GPL(ide_dma_host_set); -#endif /* CONFIG_BLK_DEV_IDEDMA_SFF */ +EXPORT_SYMBOL_GPL(ide_dma_unmap_sg); /** * ide_dma_off_quietly - Generic DMA kill * @drive: drive to control * - * Turn off the current DMA on this IDE controller. + * Turn off the current DMA on this IDE controller. */ void ide_dma_off_quietly(ide_drive_t *drive) { - drive->using_dma = 0; + drive->dev_flags &= ~IDE_DFLAG_USING_DMA; ide_toggle_bounce(drive, 0); drive->hwif->dma_ops->dma_host_set(drive, 0); } - EXPORT_SYMBOL(ide_dma_off_quietly); /** @@ -418,7 +197,6 @@ void ide_dma_off(ide_drive_t *drive) printk(KERN_INFO "%s: DMA disabled\n", drive->name); ide_dma_off_quietly(drive); } - EXPORT_SYMBOL(ide_dma_off); /** @@ -430,167 +208,13 @@ EXPORT_SYMBOL(ide_dma_off); void ide_dma_on(ide_drive_t *drive) { - drive->using_dma = 1; + drive->dev_flags |= IDE_DFLAG_USING_DMA; ide_toggle_bounce(drive, 1); drive->hwif->dma_ops->dma_host_set(drive, 1); } -#ifdef CONFIG_BLK_DEV_IDEDMA_SFF -/** - * ide_dma_setup - begin a DMA phase - * @drive: target device - * - * Build an IDE DMA PRD (IDE speak for scatter gather table) - * and then set up the DMA transfer registers for a device - * that follows generic IDE PCI DMA behaviour. Controllers can - * override this function if they need to - * - * Returns 0 on success. If a PIO fallback is required then 1 - * is returned. - */ - -int ide_dma_setup(ide_drive_t *drive) -{ - ide_hwif_t *hwif = drive->hwif; - struct request *rq = HWGROUP(drive)->rq; - unsigned int reading; - u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0; - u8 dma_stat; - - if (rq_data_dir(rq)) - reading = 0; - else - reading = 1 << 3; - - /* fall back to pio! */ - if (!ide_build_dmatable(drive, rq)) { - ide_map_sg(drive, rq); - return 1; - } - - /* PRD table */ - if (hwif->host_flags & IDE_HFLAG_MMIO) - writel(hwif->dmatable_dma, - (void __iomem *)(hwif->dma_base + ATA_DMA_TABLE_OFS)); - else - outl(hwif->dmatable_dma, hwif->dma_base + ATA_DMA_TABLE_OFS); - - /* specify r/w */ - if (mmio) - writeb(reading, (void __iomem *)(hwif->dma_base + ATA_DMA_CMD)); - else - outb(reading, hwif->dma_base + ATA_DMA_CMD); - - /* read DMA status for INTR & ERROR flags */ - dma_stat = hwif->tp_ops->read_sff_dma_status(hwif); - - /* clear INTR & ERROR flags */ - if (mmio) - writeb(dma_stat | 6, - (void __iomem *)(hwif->dma_base + ATA_DMA_STATUS)); - else - outb(dma_stat | 6, hwif->dma_base + ATA_DMA_STATUS); - - drive->waiting_for_dma = 1; - return 0; -} - -EXPORT_SYMBOL_GPL(ide_dma_setup); - -void ide_dma_exec_cmd(ide_drive_t *drive, u8 command) -{ - /* issue cmd to drive */ - ide_execute_command(drive, command, &ide_dma_intr, 2*WAIT_CMD, dma_timer_expiry); -} -EXPORT_SYMBOL_GPL(ide_dma_exec_cmd); - -void ide_dma_start(ide_drive_t *drive) -{ - ide_hwif_t *hwif = drive->hwif; - u8 dma_cmd; - - /* Note that this is done *after* the cmd has - * been issued to the drive, as per the BM-IDE spec. - * The Promise Ultra33 doesn't work correctly when - * we do this part before issuing the drive cmd. - */ - if (hwif->host_flags & IDE_HFLAG_MMIO) { - dma_cmd = readb((void __iomem *)(hwif->dma_base + ATA_DMA_CMD)); - /* start DMA */ - writeb(dma_cmd | 1, - (void __iomem *)(hwif->dma_base + ATA_DMA_CMD)); - } else { - dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD); - outb(dma_cmd | 1, hwif->dma_base + ATA_DMA_CMD); - } - - hwif->dma = 1; - wmb(); -} - -EXPORT_SYMBOL_GPL(ide_dma_start); - -/* returns 1 on error, 0 otherwise */ -int __ide_dma_end (ide_drive_t *drive) -{ - ide_hwif_t *hwif = drive->hwif; - u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0; - u8 dma_stat = 0, dma_cmd = 0; - - drive->waiting_for_dma = 0; - - if (mmio) { - /* get DMA command mode */ - dma_cmd = readb((void __iomem *)(hwif->dma_base + ATA_DMA_CMD)); - /* stop DMA */ - writeb(dma_cmd & ~1, - (void __iomem *)(hwif->dma_base + ATA_DMA_CMD)); - } else { - dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD); - outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD); - } - - /* get DMA status */ - dma_stat = hwif->tp_ops->read_sff_dma_status(hwif); - - if (mmio) - /* clear the INTR & ERROR bits */ - writeb(dma_stat | 6, - (void __iomem *)(hwif->dma_base + ATA_DMA_STATUS)); - else - outb(dma_stat | 6, hwif->dma_base + ATA_DMA_STATUS); - - /* purge DMA mappings */ - ide_destroy_dmatable(drive); - /* verify good DMA status */ - hwif->dma = 0; - wmb(); - return (dma_stat & 7) != 4 ? (0x10 | dma_stat) : 0; -} - -EXPORT_SYMBOL(__ide_dma_end); - -/* returns 1 if dma irq issued, 0 otherwise */ -int ide_dma_test_irq(ide_drive_t *drive) -{ - ide_hwif_t *hwif = HWIF(drive); - u8 dma_stat = hwif->tp_ops->read_sff_dma_status(hwif); - - /* return 1 if INTR asserted */ - if ((dma_stat & 4) == 4) - return 1; - if (!drive->waiting_for_dma) - printk(KERN_WARNING "%s: (%s) called while not waiting\n", - drive->name, __func__); - return 0; -} -EXPORT_SYMBOL_GPL(ide_dma_test_irq); -#else -static inline int config_drive_for_dma(ide_drive_t *drive) { return 0; } -#endif /* CONFIG_BLK_DEV_IDEDMA_SFF */ - -int __ide_dma_bad_drive (ide_drive_t *drive) +int __ide_dma_bad_drive(ide_drive_t *drive) { u16 *id = drive->id; @@ -602,7 +226,6 @@ int __ide_dma_bad_drive (ide_drive_t *drive) } return 0; } - EXPORT_SYMBOL(__ide_dma_bad_drive); static const u8 xfer_mode_bases[] = { @@ -618,16 +241,15 @@ static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode) const struct ide_port_ops *port_ops = hwif->port_ops; unsigned int mask = 0; - switch(base) { + switch (base) { case XFER_UDMA_0: if ((id[ATA_ID_FIELD_VALID] & 4) == 0) break; - + mask = id[ATA_ID_UDMA_MODES]; if (port_ops && port_ops->udma_filter) - mask = port_ops->udma_filter(drive); + mask &= port_ops->udma_filter(drive); else - mask = hwif->ultra_mask; - mask &= id[ATA_ID_UDMA_MODES]; + mask &= hwif->ultra_mask; /* * avoid false cable warning from eighty_ninty_three() @@ -638,18 +260,23 @@ static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode) } break; case XFER_MW_DMA_0: - if ((id[ATA_ID_FIELD_VALID] & 2) == 0) - break; + mask = id[ATA_ID_MWDMA_MODES]; + + /* Also look for the CF specific MWDMA modes... */ + if (ata_id_is_cfa(id) && (id[ATA_ID_CFA_MODES] & 0x38)) { + u8 mode = ((id[ATA_ID_CFA_MODES] & 0x38) >> 3) - 1; + + mask |= ((2 << mode) - 1) << 3; + } + if (port_ops && port_ops->mdma_filter) - mask = port_ops->mdma_filter(drive); + mask &= port_ops->mdma_filter(drive); else - mask = hwif->mwdma_mask; - mask &= id[ATA_ID_MWDMA_MODES]; + mask &= hwif->mwdma_mask; break; case XFER_SW_DMA_0: - if (id[ATA_ID_FIELD_VALID] & 2) { - mask = id[ATA_ID_SWDMA_MODES] & hwif->swdma_mask; - } else if (id[ATA_ID_OLD_DMA_MODES] >> 8) { + mask = id[ATA_ID_SWDMA_MODES]; + if (!(mask & ATA_SWDMA2) && (id[ATA_ID_OLD_DMA_MODES] >> 8)) { u8 mode = id[ATA_ID_OLD_DMA_MODES] >> 8; /* @@ -657,8 +284,9 @@ static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode) * (the maximum allowed mode is XFER_SW_DMA_2) */ if (mode <= 2) - mask = ((2 << mode) - 1) & hwif->swdma_mask; + mask = (2 << mode) - 1; } + mask &= hwif->swdma_mask; break; default: BUG(); @@ -720,23 +348,19 @@ u8 ide_find_dma_mode(ide_drive_t *drive, u8 req_mode) return mode; } -EXPORT_SYMBOL_GPL(ide_find_dma_mode); - static int ide_tune_dma(ide_drive_t *drive) { ide_hwif_t *hwif = drive->hwif; u8 speed; - if (drive->nodma || ata_id_has_dma(drive->id) == 0) + if (ata_id_has_dma(drive->id) == 0 || + (drive->dev_flags & IDE_DFLAG_NODMA)) return 0; /* consult the list of known "bad" drives */ if (__ide_dma_bad_drive(drive)) return 0; - if (ide_id_dma_bug(drive)) - return 0; - if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA) return config_drive_for_dma(drive); @@ -767,25 +391,6 @@ static int ide_dma_check(ide_drive_t *drive) return -1; } -int ide_id_dma_bug(ide_drive_t *drive) -{ - u16 *id = drive->id; - - if (id[ATA_ID_FIELD_VALID] & 4) { - if ((id[ATA_ID_UDMA_MODES] >> 8) && - (id[ATA_ID_MWDMA_MODES] >> 8)) - goto err_out; - } else if (id[ATA_ID_FIELD_VALID] & 2) { - if ((id[ATA_ID_MWDMA_MODES] >> 8) && - (id[ATA_ID_SWDMA_MODES] >> 8)) - goto err_out; - } - return 0; -err_out: - printk(KERN_ERR "%s: bad DMA info in identify block\n", drive->name); - return 1; -} - int ide_set_dma(ide_drive_t *drive) { int rc; @@ -827,66 +432,124 @@ void ide_check_dma_crc(ide_drive_t *drive) ide_dma_on(drive); } -#ifdef CONFIG_BLK_DEV_IDEDMA_SFF -void ide_dma_lost_irq (ide_drive_t *drive) +void ide_dma_lost_irq(ide_drive_t *drive) { - printk("%s: DMA interrupt recovery\n", drive->name); + printk(KERN_ERR "%s: DMA interrupt recovery\n", drive->name); } +EXPORT_SYMBOL_GPL(ide_dma_lost_irq); -EXPORT_SYMBOL(ide_dma_lost_irq); - -void ide_dma_timeout (ide_drive_t *drive) +/* + * un-busy the port etc, and clear any pending DMA status. we want to + * retry the current request in pio mode instead of risking tossing it + * all away + */ +ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) { - ide_hwif_t *hwif = HWIF(drive); + ide_hwif_t *hwif = drive->hwif; + const struct ide_dma_ops *dma_ops = hwif->dma_ops; + struct ide_cmd *cmd = &hwif->cmd; + struct request *rq; + ide_startstop_t ret = ide_stopped; - printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name); + /* + * end current dma transaction + */ - if (hwif->dma_ops->dma_test_irq(drive)) - return; + if (error < 0) { + printk(KERN_WARNING "%s: DMA timeout error\n", drive->name); + drive->waiting_for_dma = 0; + (void)dma_ops->dma_end(drive); + ide_dma_unmap_sg(drive, cmd); + ret = ide_error(drive, "dma timeout error", + hwif->tp_ops->read_status(hwif)); + } else { + printk(KERN_WARNING "%s: DMA timeout retry\n", drive->name); + if (dma_ops->dma_clear) + dma_ops->dma_clear(drive); + printk(KERN_ERR "%s: timeout waiting for DMA\n", drive->name); + if (dma_ops->dma_test_irq(drive) == 0) { + ide_dump_status(drive, "DMA timeout", + hwif->tp_ops->read_status(hwif)); + drive->waiting_for_dma = 0; + (void)dma_ops->dma_end(drive); + ide_dma_unmap_sg(drive, cmd); + } + } - hwif->dma_ops->dma_end(drive); -} + /* + * disable dma for now, but remember that we did so because of + * a timeout -- we'll reenable after we finish this next request + * (or rather the first chunk of it) in pio. + */ + drive->dev_flags |= IDE_DFLAG_DMA_PIO_RETRY; + drive->retry_pio++; + ide_dma_off_quietly(drive); -EXPORT_SYMBOL(ide_dma_timeout); + /* + * un-busy drive etc and make sure request is sane + */ + rq = hwif->rq; + if (rq) { + hwif->rq = NULL; + rq->errors = 0; + } + return ret; +} void ide_release_dma_engine(ide_hwif_t *hwif) { if (hwif->dmatable_cpu) { - struct pci_dev *pdev = to_pci_dev(hwif->dev); + int prd_size = hwif->prd_max_nents * hwif->prd_ent_size; - pci_free_consistent(pdev, PRD_ENTRIES * PRD_BYTES, - hwif->dmatable_cpu, hwif->dmatable_dma); + dma_free_coherent(hwif->dev, prd_size, + hwif->dmatable_cpu, hwif->dmatable_dma); hwif->dmatable_cpu = NULL; } } +EXPORT_SYMBOL_GPL(ide_release_dma_engine); int ide_allocate_dma_engine(ide_hwif_t *hwif) { - struct pci_dev *pdev = to_pci_dev(hwif->dev); + int prd_size; - hwif->dmatable_cpu = pci_alloc_consistent(pdev, - PRD_ENTRIES * PRD_BYTES, - &hwif->dmatable_dma); + if (hwif->prd_max_nents == 0) + hwif->prd_max_nents = PRD_ENTRIES; + if (hwif->prd_ent_size == 0) + hwif->prd_ent_size = PRD_BYTES; - if (hwif->dmatable_cpu) - return 0; + prd_size = hwif->prd_max_nents * hwif->prd_ent_size; - printk(KERN_ERR "%s: -- Error, unable to allocate DMA table.\n", + hwif->dmatable_cpu = dma_alloc_coherent(hwif->dev, prd_size, + &hwif->dmatable_dma, + GFP_ATOMIC); + if (hwif->dmatable_cpu == NULL) { + printk(KERN_ERR "%s: unable to allocate PRD table\n", hwif->name); + return -ENOMEM; + } - return 1; + return 0; } EXPORT_SYMBOL_GPL(ide_allocate_dma_engine); -const struct ide_dma_ops sff_dma_ops = { - .dma_host_set = ide_dma_host_set, - .dma_setup = ide_dma_setup, - .dma_exec_cmd = ide_dma_exec_cmd, - .dma_start = ide_dma_start, - .dma_end = __ide_dma_end, - .dma_test_irq = ide_dma_test_irq, - .dma_timeout = ide_dma_timeout, - .dma_lost_irq = ide_dma_lost_irq, -}; -EXPORT_SYMBOL_GPL(sff_dma_ops); -#endif /* CONFIG_BLK_DEV_IDEDMA_SFF */ +int ide_dma_prepare(ide_drive_t *drive, struct ide_cmd *cmd) +{ + const struct ide_dma_ops *dma_ops = drive->hwif->dma_ops; + + if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0 || + (dma_ops->dma_check && dma_ops->dma_check(drive, cmd))) + goto out; + ide_map_sg(drive, cmd); + if (ide_dma_map_sg(drive, cmd) == 0) + goto out_map; + if (dma_ops->dma_setup(drive, cmd)) + goto out_dma_unmap; + drive->waiting_for_dma = 1; + return 0; +out_dma_unmap: + ide_dma_unmap_sg(drive, cmd); +out_map: + ide_map_sg(drive, cmd); +out: + return 1; +}