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sl82c105: add speedproc() method and MWDMA0/1 support 

Add the speedproc() method for setting transfer modes, modify config_for_dma()
to call it and use ide_max_dma_mode() to select the best DMA mode.
Add support for the multiword DMA modes 0 and 1, using the upper half of the
'drive_data' field to store the DMA timings to program into the drive control
register when DMA is turned on for real.

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Sergei Shtylyov 2007-05-16 00:51:44 +02:00 committed by Bartlomiej Zolnierkiewicz
parent 3c3f5d2c9f
commit 46cedc9b77
1 changed files with 66 additions and 5 deletions
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71
drivers/ide/pci/sl82c105.c
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@ -82,7 +82,14 @@ static u8 sl82c105_tune_pio(ide_drive_t *drive, u8 pio)
pio = ide_get_best_pio_mode(drive, pio, 5, &p);
drive->drive_data = drv_ctrl = get_pio_timings(&p);
drv_ctrl = get_pio_timings(&p);
/*
* Store the PIO timings so that we can restore them
* in case DMA will be turned off...
*/
drive->drive_data &= 0xffff0000;
drive->drive_data |= drv_ctrl;
if (!drive->using_dma) {
/*
@ -99,15 +106,68 @@ static u8 sl82c105_tune_pio(ide_drive_t *drive, u8 pio)
return pio;
}
/*
* Configure the drive and chipset for a new transfer speed.
*/
static int sl82c105_tune_chipset(ide_drive_t *drive, u8 speed)
{
static u16 mwdma_timings[] = {0x0707, 0x0201, 0x0200};
u16 drv_ctrl;
DBG(("sl82c105_tune_chipset(drive:%s, speed:%s)\n",
drive->name, ide_xfer_verbose(speed)));
speed = ide_rate_filter(drive, speed);
switch (speed) {
case XFER_MW_DMA_2:
case XFER_MW_DMA_1:
case XFER_MW_DMA_0:
drv_ctrl = mwdma_timings[speed - XFER_MW_DMA_0];
/*
* Store the DMA timings so that we can actually program
* them when DMA will be turned on...
*/
drive->drive_data &= 0x0000ffff;
drive->drive_data |= (unsigned long)drv_ctrl << 16;
/*
* If we are already using DMA, we just reprogram
* the drive control register.
*/
if (drive->using_dma) {
struct pci_dev *dev = HWIF(drive)->pci_dev;
int reg = 0x44 + drive->dn * 4;
pci_write_config_word(dev, reg, drv_ctrl);
}
break;
case XFER_PIO_5:
case XFER_PIO_4:
case XFER_PIO_3:
case XFER_PIO_2:
case XFER_PIO_1:
case XFER_PIO_0:
(void) sl82c105_tune_pio(drive, speed - XFER_PIO_0);
break;
default:
return -1;
}
return ide_config_drive_speed(drive, speed);
}
/*
* Configure the drive for DMA.
* We'll program the chipset only when DMA is actually turned on.
*/
static int config_for_dma(ide_drive_t *drive)
{
u8 speed = ide_max_dma_mode(drive);
DBG(("config_for_dma(drive:%s)\n", drive->name));
if (ide_config_drive_speed(drive, XFER_MW_DMA_2) != 0)
if (!speed || sl82c105_tune_chipset(drive, speed))
return 0;
return ide_dma_enable(drive);
@ -219,7 +279,7 @@ static int sl82c105_ide_dma_on(ide_drive_t *drive)
rc = __ide_dma_on(drive);
if (rc == 0) {
pci_write_config_word(dev, reg, 0x0200);
pci_write_config_word(dev, reg, drive->drive_data >> 16);
printk(KERN_INFO "%s: DMA enabled\n", drive->name);
}
@ -357,6 +417,7 @@ static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif)
DBG(("init_hwif_sl82c105(hwif: ide%d)\n", hwif->index));
hwif->tuneproc = &sl82c105_tune_drive;
hwif->speedproc = &sl82c105_tune_chipset;
hwif->selectproc = &sl82c105_selectproc;
hwif->resetproc = &sl82c105_resetproc;
@ -388,7 +449,7 @@ static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif)
}
hwif->atapi_dma = 1;
hwif->mwdma_mask = 0x04;
hwif->mwdma_mask = 0x07;
hwif->ide_dma_check = &sl82c105_ide_dma_check;
hwif->ide_dma_on = &sl82c105_ide_dma_on;