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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2010-01-18 10:20:00 +0300
committerDavid S. Miller <davem@davemloft.net>2010-01-19 12:41:58 +0300
commitf931a5d5785d7b7c44871bd7ad2762e29dfddf29 (patch)
treeaf04196b29f9ee7644e6e274dde8fa106a2b7abc /drivers
parenta13e4865fac374f2edf2666b66f2f88e527db2b7 (diff)
downloadlinux-f931a5d5785d7b7c44871bd7ad2762e29dfddf29.tar.xz
via82cxxx: workaround h/w bugs
Add custom struct ide_tp_ops instance to fix the internal bug of some VIA chipsets which will reset the device register after changing the nIEN bit in the device control register. Based on commit bfce5e0 for pata_via host driver. Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/ide/via82cxxx.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/ide/via82cxxx.c b/drivers/ide/via82cxxx.c
index 11b3e711451a..46e8ddbdf031 100644
--- a/drivers/ide/via82cxxx.c
+++ b/drivers/ide/via82cxxx.c
@@ -107,6 +107,7 @@ struct via82cxxx_dev
{
struct via_isa_bridge *via_config;
unsigned int via_80w;
+ u8 cached_device[2];
};
/**
@@ -382,10 +383,66 @@ static const struct ide_port_ops via_port_ops = {
.cable_detect = via82cxxx_cable_detect,
};
+static void via_write_devctl(ide_hwif_t *hwif, u8 ctl)
+{
+ struct via82cxxx_dev *vdev = hwif->host->host_priv;
+
+ outb(ctl, hwif->io_ports.ctl_addr);
+ outb(vdev->cached_device[hwif->channel], hwif->io_ports.device_addr);
+}
+
+static void __via_dev_select(ide_drive_t *drive, u8 select)
+{
+ ide_hwif_t *hwif = drive->hwif;
+ struct via82cxxx_dev *vdev = hwif->host->host_priv;
+
+ outb(select, hwif->io_ports.device_addr);
+ vdev->cached_device[hwif->channel] = select;
+}
+
+static void via_dev_select(ide_drive_t *drive)
+{
+ __via_dev_select(drive, drive->select | ATA_DEVICE_OBS);
+}
+
+static void via_tf_load(ide_drive_t *drive, struct ide_taskfile *tf, u8 valid)
+{
+ ide_hwif_t *hwif = drive->hwif;
+ struct ide_io_ports *io_ports = &hwif->io_ports;
+
+ if (valid & IDE_VALID_FEATURE)
+ outb(tf->feature, io_ports->feature_addr);
+ if (valid & IDE_VALID_NSECT)
+ outb(tf->nsect, io_ports->nsect_addr);
+ if (valid & IDE_VALID_LBAL)
+ outb(tf->lbal, io_ports->lbal_addr);
+ if (valid & IDE_VALID_LBAM)
+ outb(tf->lbam, io_ports->lbam_addr);
+ if (valid & IDE_VALID_LBAH)
+ outb(tf->lbah, io_ports->lbah_addr);
+ if (valid & IDE_VALID_DEVICE)
+ __via_dev_select(drive, tf->device);
+}
+
+const struct ide_tp_ops via_tp_ops = {
+ .exec_command = ide_exec_command,
+ .read_status = ide_read_status,
+ .read_altstatus = ide_read_altstatus,
+ .write_devctl = via_write_devctl,
+
+ .dev_select = via_dev_select,
+ .tf_load = via_tf_load,
+ .tf_read = ide_tf_read,
+
+ .input_data = ide_input_data,
+ .output_data = ide_output_data,
+};
+
static const struct ide_port_info via82cxxx_chipset __devinitdata = {
.name = DRV_NAME,
.init_chipset = init_chipset_via82cxxx,
.enablebits = { { 0x40, 0x02, 0x02 }, { 0x40, 0x01, 0x01 } },
+ .tp_ops = &via_tp_ops,
.port_ops = &via_port_ops,
.host_flags = IDE_HFLAG_PIO_NO_BLACKLIST |
IDE_HFLAG_POST_SET_MODE |