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authorAkira Iguchi <akira2.iguchi@toshiba.co.jp>2007-03-03 17:48:55 +0100
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2007-03-03 17:48:55 +0100
commit06a9952b8379c48df972023f648014a82582c23a (patch)
tree54502af21dff2a7a2ec7f7ffe70208e849fd9fad /drivers
parent846c11abc7934a523a665a3b702358e6f2998e3e (diff)
scc_pata: bugfix for checking DMA IRQ status
On Tuesday 27 February 2007, Akira Iguchi wrote: > > But since I sent the first patch, I found a bug for checking DMA IRQ status. > (http://www.spinics.net/lists/linux-ide/msg06903.html) > Then I sent the fixed patch for libata only. So my drivers/ide patch > still has same bug and I want to fix it, too. > > The following patch fixes this bug. Please apply this patch. From: Akira Iguchi <akira2.iguchi@toshiba.co.jp> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/ide/ppc/scc_pata.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/ide/ppc/scc_pata.c b/drivers/ide/ppc/scc_pata.c
index de64b022478..f84bf791f72 100644
--- a/drivers/ide/ppc/scc_pata.c
+++ b/drivers/ide/ppc/scc_pata.c
@@ -509,6 +509,32 @@ static int scc_ide_dma_end(ide_drive_t * drive)
return __ide_dma_end(drive);
}
+/* returns 1 if dma irq issued, 0 otherwise */
+static int scc_dma_test_irq(ide_drive_t *drive)
+{
+ ide_hwif_t *hwif = HWIF(drive);
+ u8 dma_stat = hwif->INB(hwif->dma_status);
+
+ /* return 1 if INTR asserted */
+ if ((dma_stat & 4) == 4)
+ return 1;
+
+ /* Workaround for PTERADD: emulate DMA_INTR when
+ * - IDE_STATUS[ERR] = 1
+ * - INT_STATUS[INTRQ] = 1
+ * - DMA_STATUS[IORACTA] = 1
+ */
+ if (in_be32((void __iomem *)IDE_ALTSTATUS_REG) & ERR_STAT &&
+ in_be32((void __iomem *)(hwif->dma_base + 0x014)) & INTSTS_INTRQ &&
+ dma_stat & 1)
+ return 1;
+
+ if (!drive->waiting_for_dma)
+ printk(KERN_WARNING "%s: (%s) called while not waiting\n",
+ drive->name, __FUNCTION__);
+ return 0;
+}
+
/**
* setup_mmio_scc - map CTRL/BMID region
* @dev: PCI device we are configuring
@@ -712,6 +738,7 @@ static void __devinit init_hwif_scc(ide_hwif_t *hwif)
hwif->speedproc = scc_tune_chipset;
hwif->tuneproc = scc_tuneproc;
hwif->ide_dma_check = scc_config_drive_for_dma;
+ hwif->ide_dma_test_irq = scc_dma_test_irq;
hwif->drives[0].autotune = IDE_TUNE_AUTO;
hwif->drives[1].autotune = IDE_TUNE_AUTO;