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ata: pata_hpt366: check channel enable bits

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HighPoint HPT36x chips did turn out to have the channel enable bits --
however, badly implemented. Make use of them, despite that is probably
only going to burden the driver's code -- assuming both channels are
always enabled by the HighPoint BIOS anyway...

Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
This commit is contained in:
Sergey Shtylyov 2022-02-10 12:56:31 +03:00 committed by Damien Le Moal
parent 88e6b81878
commit f79ca4550c
1 changed files with 40 additions and 2 deletions
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42
drivers/ata/pata_hpt366.c
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@ -23,7 +23,7 @@
#include <linux/libata.h>
#define DRV_NAME "pata_hpt366"
#define DRV_VERSION "0.6.11"
#define DRV_VERSION "0.6.12"
struct hpt_clock {
u8 xfer_mode;
@ -278,6 +278,35 @@ static void hpt366_set_dmamode(struct ata_port *ap, struct ata_device *adev)
hpt366_set_mode(ap, adev, adev->dma_mode);
}
/**
* hpt366_prereset - reset the hpt36x bus
* @link: ATA link to reset
* @deadline: deadline jiffies for the operation
*
* Perform the initial reset handling for the 36x series controllers.
* Reset the hardware and state machine,
*/
static int hpt366_prereset(struct ata_link *link, unsigned long deadline)
{
struct ata_port *ap = link->ap;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
/*
* HPT36x chips have one channel per function and have
* both channel enable bits located differently and visible
* to both functions -- really stupid design decision... :-(
* Bit 4 is for the primary channel, bit 5 for the secondary.
*/
static const struct pci_bits hpt366_enable_bits = {
0x50, 1, 0x30, 0x30
};
if (!pci_test_config_bits(pdev, &hpt366_enable_bits))
return -ENOENT;
return ata_sff_prereset(link, deadline);
}
static struct scsi_host_template hpt36x_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
@ -288,6 +317,7 @@ static struct scsi_host_template hpt36x_sht = {
static struct ata_port_operations hpt366_port_ops = {
.inherits = &ata_bmdma_port_ops,
.prereset = hpt366_prereset,
.cable_detect = hpt36x_cable_detect,
.mode_filter = hpt366_filter,
.set_piomode = hpt366_set_piomode,
@ -304,7 +334,7 @@ static struct ata_port_operations hpt366_port_ops = {
static void hpt36x_init_chipset(struct pci_dev *dev)
{
u8 drive_fast;
u8 drive_fast, mcr1;
pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, (L1_CACHE_BYTES / 4));
pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0x78);
@ -314,6 +344,14 @@ static void hpt36x_init_chipset(struct pci_dev *dev)
pci_read_config_byte(dev, 0x51, &drive_fast);
if (drive_fast & 0x80)
pci_write_config_byte(dev, 0x51, drive_fast & ~0x80);
/*
* Now we'll have to force both channels enabled if at least one
* of them has been enabled by BIOS...
*/
pci_read_config_byte(dev, 0x50, &mcr1);
if (mcr1 & 0x30)
pci_write_config_byte(dev, 0x50, mcr1 | 0x30);
}
/**