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| author |   Sergey Shtylyov <s.shtylyov@omp.ru> | 2022-02-10 12:56:31 +0300 |
|---|---|---|
| committer |   Damien Le Moal <damien.lemoal@opensource.wdc.com> | 2022-02-19 11:18:43 +0900 |
| commit | f79ca4550c3cb985313f69fcd4e82770d18fc8fe (patch) | |
| tree | dbdc1b1acf47df15dc7b106bbc19340c18423635 /drivers/ata/pata_hpt366.c | |
| parent | ata: sata_rcar: make sata_rcar_ata_devchk() return 'bool' (diff) | |
| download | linux-dev-f79ca4550c3cb985313f69fcd4e82770d18fc8fe.tar.xz linux-dev-f79ca4550c3cb985313f69fcd4e82770d18fc8fe.zip | |
ata: pata_hpt366: check channel enable bits
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>
Diffstat (limited to 'drivers/ata/pata_hpt366.c')
| -rw-r--r-- | drivers/ata/pata_hpt366.c | 42 |
1 files changed, 40 insertions, 2 deletions
diff --git a/drivers/ata/pata_hpt366.c b/drivers/ata/pata_hpt366.c index 778c893f276b..96caa79dc8d7 100644 --- a/drivers/ata/pata_hpt366.c +++ b/drivers/ata/pata_hpt366.c @@ -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); } /** |