ide: rework the code for selecting the best DMA transfer mode (v3)
Depends on the "ide: fix UDMA/MWDMA/SWDMA masks" patch.
* add ide_hwif_t.udma_filter hook for filtering UDMA mask
(use it in alim15x3, hpt366, siimage and serverworks drivers)
* add ide_max_dma_mode() for finding best DMA mode for the device
(loosely based on some older libata-core.c code)
* convert ide_dma_speed() users to use ide_max_dma_mode()
* make ide_rate_filter() take "ide_drive_t *drive" as an argument instead
of "u8 mode" and teach it to how to use UDMA mask to do filtering
* use ide_rate_filter() in hpt366 driver
* remove no longer needed ide_dma_speed() and *_ratemask()
* unexport eighty_ninty_three()
v2:
* rename ->filter_udma_mask to ->udma_filter
[ Suggested by Sergei Shtylyov <sshtylyov@ru.mvista.com>. ]
v3:
* updated for scc_pata driver (fixes XFER_UDMA_6 filtering for user-space
originated transfer mode change requests when 100MHz clock is used)
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/pci/serverworks.c b/drivers/ide/pci/serverworks.c
index dbcd37a..2fa6d92 100644
--- a/drivers/ide/pci/serverworks.c
+++ b/drivers/ide/pci/serverworks.c
@@ -65,16 +65,16 @@
return 0;
}
-static u8 svwks_ratemask (ide_drive_t *drive)
+static u8 svwks_udma_filter(ide_drive_t *drive)
{
struct pci_dev *dev = HWIF(drive)->pci_dev;
- u8 mode = 0;
+ u8 mask = 0;
if (!svwks_revision)
pci_read_config_byte(dev, PCI_REVISION_ID, &svwks_revision);
if (dev->device == PCI_DEVICE_ID_SERVERWORKS_HT1000IDE)
- return 2;
+ return 0x1f;
if (dev->device == PCI_DEVICE_ID_SERVERWORKS_OSB4IDE) {
u32 reg = 0;
if (isa_dev)
@@ -86,25 +86,31 @@
if(drive->media == ide_disk)
return 0;
/* Check the OSB4 DMA33 enable bit */
- return ((reg & 0x00004000) == 0x00004000) ? 1 : 0;
+ return ((reg & 0x00004000) == 0x00004000) ? 0x07 : 0;
} else if (svwks_revision < SVWKS_CSB5_REVISION_NEW) {
- return 1;
+ return 0x07;
} else if (svwks_revision >= SVWKS_CSB5_REVISION_NEW) {
- u8 btr = 0;
+ u8 btr = 0, mode;
pci_read_config_byte(dev, 0x5A, &btr);
mode = btr & 0x3;
- if (!eighty_ninty_three(drive))
- mode = min(mode, (u8)1);
+
/* If someone decides to do UDMA133 on CSB5 the same
issue will bite so be inclusive */
if (mode > 2 && check_in_drive_lists(drive, svwks_bad_ata100))
mode = 2;
+
+ switch(mode) {
+ case 2: mask = 0x1f; break;
+ case 1: mask = 0x07; break;
+ default: mask = 0x00; break;
+ }
}
if (((dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE) ||
(dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)) &&
(!(PCI_FUNC(dev->devfn) & 1)))
- mode = 2;
- return mode;
+ mask = 0x1f;
+
+ return mask;
}
static u8 svwks_csb_check (struct pci_dev *dev)
@@ -141,7 +147,7 @@
if (xferspeed == 255) /* PIO auto-tuning */
speed = XFER_PIO_0 + pio;
else
- speed = ide_rate_filter(svwks_ratemask(drive), xferspeed);
+ speed = ide_rate_filter(drive, xferspeed);
/* If we are about to put a disk into UDMA mode we screwed up.
Our code assumes we never _ever_ do this on an OSB4 */
@@ -304,7 +310,7 @@
static int config_chipset_for_dma (ide_drive_t *drive)
{
- u8 speed = ide_dma_speed(drive, svwks_ratemask(drive));
+ u8 speed = ide_max_dma_mode(drive);
if (!(speed))
speed = XFER_PIO_0 + ide_get_best_pio_mode(drive, 255, 5, NULL);
@@ -500,6 +506,7 @@
hwif->tuneproc = &svwks_tune_drive;
hwif->speedproc = &svwks_tune_chipset;
+ hwif->udma_filter = &svwks_udma_filter;
hwif->atapi_dma = 1;