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authorSergey Shtylyov <s.shtylyov@omp.ru>2022-02-10 12:56:31 +0300
committerDamien Le Moal <damien.lemoal@opensource.wdc.com>2022-02-19 05:18:43 +0300
commitf79ca4550c3cb985313f69fcd4e82770d18fc8fe (patch)
treedbdc1b1acf47df15dc7b106bbc19340c18423635 /drivers/ata/pata_hpt366.c
parent88e6b81878fb3fce93a26879164a2b7f5cbc848a (diff)
downloadlinux-f79ca4550c3cb985313f69fcd4e82770d18fc8fe.tar.xz
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.c42
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);
}
/**