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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-10-13 21:39:47 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-10-13 21:39:47 +0200
commit2dbe7e919eb696c86790797f8a814bef19a0d50a (patch)
tree59f9b665d99790226e1fba3d463fae3edab2c95a /drivers/ide/ide-dma.c
parentdb3f99ef7c30d541e4a78931acf2c64abe3e26d1 (diff)
downloadlinux-2dbe7e919eb696c86790797f8a814bef19a0d50a.tar.bz2
ide: move SFF DMA code to ide-dma-sff.c
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide/ide-dma.c')
-rw-r--r--drivers/ide/ide-dma.c363
1 files changed, 1 insertions, 362 deletions
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index d935a6ec022f..fffd11717b2d 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -33,7 +33,6 @@
#include <linux/ide.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
-#include <linux/io.h>
static const struct drive_list_entry drive_whitelist[] = {
{ "Micropolis 2112A" , NULL },
@@ -109,7 +108,7 @@ ide_startstop_t ide_dma_intr(ide_drive_t *drive)
}
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);
}
@@ -142,90 +141,6 @@ int ide_build_sglist(ide_drive_t *drive, struct request *rq)
}
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.
- *
- * Most chipsets correctly interpret a length of 0x0000 as 64KB,
- * but at least one (e.g. CS5530) misinterprets it as zero (!).
- * So we break the 64KB entry into two 32KB entries instead.
- *
- * 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 = drive->hwif;
- __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 = ide_build_sglist(drive, rq);
- if (hwif->sg_nents == 0)
- return 0;
-
- for_each_sg(hwif->sg_table, sg, hwif->sg_nents, i) {
- u32 cur_addr, cur_len, xcount, bcount;
-
- 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)
- goto use_pio_instead;
-
- 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;
- if (xcount == 0x0000) {
- if (count++ >= PRD_ENTRIES)
- 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;
- }
- }
-
- if (count) {
- if (!is_trm290)
- *--table |= cpu_to_le32(0x80000000);
- return count;
- }
-
-use_pio_instead:
- printk(KERN_ERR "%s: %s\n", drive->name,
- count ? "DMA table too small" : "empty DMA table?");
-
- ide_destroy_dmatable(drive);
-
- return 0; /* revert to PIO for this request */
-}
-EXPORT_SYMBOL_GPL(ide_build_dmatable);
-#endif
-
/**
* ide_destroy_dmatable - clean up DMA mapping
* @drive: The drive to unmap
@@ -246,120 +161,6 @@ void ide_destroy_dmatable(ide_drive_t *drive)
}
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)
-{
- 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_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 = drive->hwif;
- u8 dma_stat = hwif->tp_ops->read_sff_dma_status(hwif);
-
- printk(KERN_WARNING "%s: %s: DMA status (0x%02x)\n",
- drive->name, __func__, dma_stat);
-
- if ((dma_stat & 0x18) == 0x18) /* BUSY Stupid Early Timer !! */
- return WAIT_CMD;
-
- hwif->hwgroup->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 = drive->hwif;
- u8 unit = drive->dn & 1;
- 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 */
-
/**
* ide_dma_off_quietly - Generic DMA kill
* @drive: drive to control
@@ -406,154 +207,6 @@ void ide_dma_on(ide_drive_t *drive)
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 = hwif->hwgroup->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);
- }
-
- 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 */
- wmb();
- return (dma_stat & 7) != 4 ? (0x10 | dma_stat) : 0;
-}
-EXPORT_SYMBOL_GPL(ide_dma_end);
-
-/* returns 1 if dma irq issued, 0 otherwise */
-int ide_dma_test_irq(ide_drive_t *drive)
-{
- ide_hwif_t *hwif = drive->hwif;
- u8 dma_stat = hwif->tp_ops->read_sff_dma_status(hwif);
-
- /* return 1 if INTR asserted */
- if ((dma_stat & 4) == 4)
- return 1;
-
- 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)
{
u16 *id = drive->id;
@@ -846,17 +499,3 @@ int ide_allocate_dma_engine(ide_hwif_t *hwif)
return 0;
}
EXPORT_SYMBOL_GPL(ide_allocate_dma_engine);
-
-#ifdef CONFIG_BLK_DEV_IDEDMA_SFF
-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 */