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pata_hpt366: reimplement mode programming 

Reimplement mode programming logic of pata_hpt366 such that it's
identical to that of IDE hpt366 driver.  The differences were...

* pata_hpt366 used 0xCFFF8FFFF to mask pio modes and 0x3FFFFFFF dma
  modes.  IDE hpt366 uses 0xC1F8FFFF for PIO, 0x303800FF for MWDMA and
  0x30070000 for UDMA.

* pata_hpt366 doesn't set 0x08000000 for PIO unless it's already set
  and always turns it on for MWDMA/UDMA.  IDE hpt366 doesn't bother
  with the bit.  It always uses what was there.

* IDE hpt366 always clears 0xC0000000.  pata_hpt366 doesn't.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2009-01-08 16:29:20 -05:00 committed by Jeff Garzik
parent b63d395325
commit 6ecb6f25d3
1 changed files with 46 additions and 67 deletions
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113
drivers/ata/pata_hpt366.c
View File

@ -30,7 +30,7 @@
#define DRV_VERSION "0.6.2"
struct hpt_clock {
u8 xfer_speed;
u8 xfer_mode;
u32 timing;
};
@ -189,28 +189,6 @@ static unsigned long hpt366_filter(struct ata_device *adev, unsigned long mask)
return ata_bmdma_mode_filter(adev, mask);
}
/**
* hpt36x_find_mode - reset the hpt36x bus
* @ap: ATA port
* @speed: transfer mode
*
* Return the 32bit register programming information for this channel
* that matches the speed provided.
*/
static u32 hpt36x_find_mode(struct ata_port *ap, int speed)
{
struct hpt_clock *clocks = ap->host->private_data;
while(clocks->xfer_speed) {
if (clocks->xfer_speed == speed)
return clocks->timing;
clocks++;
}
BUG();
return 0xffffffffU; /* silence compiler warning */
}
static int hpt36x_cable_detect(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
@ -226,6 +204,49 @@ static int hpt36x_cable_detect(struct ata_port *ap)
return ATA_CBL_PATA80;
}
static void hpt366_set_mode(struct ata_port *ap, struct ata_device *adev,
u8 mode)
{
struct hpt_clock *clocks = ap->host->private_data;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u32 addr1 = 0x40 + 4 * (adev->devno + 2 * ap->port_no);
u32 addr2 = 0x51 + 4 * ap->port_no;
u32 mask, reg;
u8 fast;
/* Fast interrupt prediction disable, hold off interrupt disable */
pci_read_config_byte(pdev, addr2, &fast);
if (fast & 0x80) {
fast &= ~0x80;
pci_write_config_byte(pdev, addr2, fast);
}
/* determine timing mask and find matching clock entry */
if (mode < XFER_MW_DMA_0)
mask = 0xc1f8ffff;
else if (mode < XFER_UDMA_0)
mask = 0x303800ff;
else
mask = 0x30070000;
while (clocks->xfer_mode) {
if (clocks->xfer_mode == mode)
break;
clocks++;
}
if (!clocks->xfer_mode)
BUG();
/*
* Combine new mode bits with old config bits and disable
* on-chip PIO FIFO/buffer (and PIO MST mode as well) to avoid
* problems handling I/O errors later.
*/
pci_read_config_dword(pdev, addr1, &reg);
reg = ((reg & ~mask) | (clocks->timing & mask)) & ~0xc0000000;
pci_write_config_dword(pdev, addr1, reg);
}
/**
* hpt366_set_piomode - PIO setup
* @ap: ATA interface
@ -236,28 +257,7 @@ static int hpt36x_cable_detect(struct ata_port *ap)
static void hpt366_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u32 addr1, addr2;
u32 reg;
u32 mode;
u8 fast;
addr1 = 0x40 + 4 * (adev->devno + 2 * ap->port_no);
addr2 = 0x51 + 4 * ap->port_no;
/* Fast interrupt prediction disable, hold off interrupt disable */
pci_read_config_byte(pdev, addr2, &fast);
if (fast & 0x80) {
fast &= ~0x80;
pci_write_config_byte(pdev, addr2, fast);
}
pci_read_config_dword(pdev, addr1, &reg);
mode = hpt36x_find_mode(ap, adev->pio_mode);
mode &= ~0x8000000; /* No FIFO in PIO */
mode &= ~0x30070000; /* Leave config bits alone */
reg &= 0x30070000; /* Strip timing bits */
pci_write_config_dword(pdev, addr1, reg | mode);
hpt366_set_mode(ap, adev, adev->pio_mode);
}
/**
@ -271,28 +271,7 @@ static void hpt366_set_piomode(struct ata_port *ap, struct ata_device *adev)
static void hpt366_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u32 addr1, addr2;
u32 reg;
u32 mode;
u8 fast;
addr1 = 0x40 + 4 * (adev->devno + 2 * ap->port_no);
addr2 = 0x51 + 4 * ap->port_no;
/* Fast interrupt prediction disable, hold off interrupt disable */
pci_read_config_byte(pdev, addr2, &fast);
if (fast & 0x80) {
fast &= ~0x80;
pci_write_config_byte(pdev, addr2, fast);
}
pci_read_config_dword(pdev, addr1, &reg);
mode = hpt36x_find_mode(ap, adev->dma_mode);
mode |= 0x8000000; /* FIFO in MWDMA or UDMA */
mode &= ~0xC0000000; /* Leave config bits alone */
reg &= 0xC0000000; /* Strip timing bits */
pci_write_config_dword(pdev, addr1, reg | mode);
hpt366_set_mode(ap, adev, adev->dma_mode);
}
static struct scsi_host_template hpt36x_sht = {