ide: move SFF DMA code to ide-dma-sff.c

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

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 */