scc_pata: PIO fixes

* Use pio == 255 == "auto-tune" in scc_config_drive_for_dma() instead of
  forcing PIO4 on PIO fallback.  Fix comment while at it.

* Rename scc_tuneproc() to scc_tune_pio() and add scc_tuneproc() wrapper.
  Move finding of the best PIO mode and setting of transfer mode on the device
  to the new wrapper.

* Fix scc_tune_chipset() to tune PIO modes.  Do a small cleanup while at it.
Acked-by: default avatarSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
parent 0c8de52d
......@@ -190,7 +190,7 @@ scc_ide_outsl(unsigned long port, void *addr, u32 count)
}
/**
* scc_tuneproc - tune a drive PIO mode
* scc_tune_pio - tune a drive PIO mode
* @drive: drive to tune
* @mode_wanted: the target operating mode
*
......@@ -198,7 +198,7 @@ scc_ide_outsl(unsigned long port, void *addr, u32 count)
* controller.
*/
static void scc_tuneproc(ide_drive_t *drive, byte mode_wanted)
static void scc_tune_pio(ide_drive_t *drive, const u8 pio)
{
ide_hwif_t *hwif = HWIF(drive);
struct scc_ports *ports = ide_get_hwifdata(hwif);
......@@ -207,41 +207,25 @@ static void scc_tuneproc(ide_drive_t *drive, byte mode_wanted)
unsigned long piosht_port = ctl_base + 0x000;
unsigned long pioct_port = ctl_base + 0x004;
unsigned long reg;
unsigned char speed = XFER_PIO_0;
int offset;
mode_wanted = ide_get_best_pio_mode(drive, mode_wanted, 4);
switch (mode_wanted) {
case 4:
speed = XFER_PIO_4;
break;
case 3:
speed = XFER_PIO_3;
break;
case 2:
speed = XFER_PIO_2;
break;
case 1:
speed = XFER_PIO_1;
break;
case 0:
default:
speed = XFER_PIO_0;
break;
}
reg = in_be32((void __iomem *)cckctrl_port);
if (reg & CCKCTRL_ATACLKOEN) {
offset = 1; /* 133MHz */
} else {
offset = 0; /* 100MHz */
}
reg = JCHSTtbl[offset][mode_wanted] << 16 | JCHHTtbl[offset][mode_wanted];
reg = JCHSTtbl[offset][pio] << 16 | JCHHTtbl[offset][pio];
out_be32((void __iomem *)piosht_port, reg);
reg = JCHCTtbl[offset][mode_wanted];
reg = JCHCTtbl[offset][pio];
out_be32((void __iomem *)pioct_port, reg);
}
ide_config_drive_speed(drive, speed);
static void scc_tuneproc(ide_drive_t *drive, u8 pio)
{
pio = ide_get_best_pio_mode(drive, pio, 4);
scc_tune_pio(drive, pio);
ide_config_drive_speed(drive, XFER_PIO_0 + pio);
}
/**
......@@ -280,26 +264,21 @@ static int scc_tune_chipset(ide_drive_t *drive, byte xferspeed)
switch (speed) {
case XFER_UDMA_6:
idx = 6;
break;
case XFER_UDMA_5:
idx = 5;
break;
case XFER_UDMA_4:
idx = 4;
break;
case XFER_UDMA_3:
idx = 3;
break;
case XFER_UDMA_2:
idx = 2;
break;
case XFER_UDMA_1:
idx = 1;
break;
case XFER_UDMA_0:
idx = 0;
idx = speed - XFER_UDMA_0;
break;
case XFER_PIO_4:
case XFER_PIO_3:
case XFER_PIO_2:
case XFER_PIO_1:
case XFER_PIO_0:
scc_tune_pio(drive, speed - XFER_PIO_0);
return ide_config_drive_speed(drive, speed);
default:
return 1;
}
......@@ -329,7 +308,7 @@ static int scc_tune_chipset(ide_drive_t *drive, byte xferspeed)
* required.
* If the drive isn't suitable for DMA or we hit other problems
* then we will drop down to PIO and set up PIO appropriately.
* (return 1)
* (return -1)
*/
static int scc_config_drive_for_dma(ide_drive_t *drive)
......@@ -338,7 +317,7 @@ static int scc_config_drive_for_dma(ide_drive_t *drive)
return 0;
if (ide_use_fast_pio(drive))
scc_tuneproc(drive, 4);
scc_tuneproc(drive, 255);
return -1;
}
......
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