pata_via: add VX800 flag; add function for fixing h/w bugs

Add flag VIA_SATA_PATA for vx800, VX800 uses the same
chipset(0x0581/0x5324) as CX700, which has 1 PATA channel(Master/Slave)
and 1 SATA channel(Master/Slave) Add function <via_ata_tf_load>.  This is
to fix the internal bug of VIA chipsets, which will reset the device
register after changing the IEN bit in CTL register

Signed-off-by: Joseph Chan <josephchan@via.com.tw>
Cc: Tejun Heo <tj@kernel.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/ata/pata_via.c b/drivers/ata/pata_via.c
index 708ed144ede9175219a93f6acc499f6cd7421952..57d951b11f2d840c18d92f7ed180ef7a240a386d 100644 (file)
--- a/drivers/ata/pata_via.c
+++ b/drivers/ata/pata_via.c
@@ -98,7 +98,8 @@ static const struct via_isa_bridge {
        u8 rev_max;
        u16 flags;
 } via_isa_bridges[] = {
-       { "vx800",      PCI_DEVICE_ID_VIA_VX800,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
+       { "vx800",      PCI_DEVICE_ID_VIA_VX800,    0x00, 0x2f, VIA_UDMA_133 |
+       VIA_BAD_AST | VIA_SATA_PATA },
        { "vt8237s",    PCI_DEVICE_ID_VIA_8237S,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
        { "vt8251",     PCI_DEVICE_ID_VIA_8251,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
        { "cx700",      PCI_DEVICE_ID_VIA_CX700,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_SATA_PATA },
@@ -322,6 +323,65 @@ static void via_set_dmamode(struct ata_port *ap, struct ata_device *adev)
        via_do_set_mode(ap, adev, adev->dma_mode, tclock[mode], set_ast, udma[mode]);
 }
 
+/**
+ *     via_ata_sff_tf_load - send taskfile registers to host controller
+ *     @ap: Port to which output is sent
+ *     @tf: ATA taskfile register set
+ *
+ *     Outputs ATA taskfile to standard ATA host controller.
+ *
+ *     Note: This is to fix the internal bug of via chipsets, which
+ *  will reset the device register after changing the IEN bit on
+ *  ctl register
+ */
+static void via_ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+       struct ata_ioports *ioaddr = &ap->ioaddr;
+       unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
+
+       if (tf->ctl != ap->last_ctl) {
+               iowrite8(tf->ctl, ioaddr->ctl_addr);
+               iowrite8(tf->device, ioaddr->device_addr);
+               ap->last_ctl = tf->ctl;
+               ata_wait_idle(ap);
+       }
+
+       if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
+               iowrite8(tf->hob_feature, ioaddr->feature_addr);
+               iowrite8(tf->hob_nsect, ioaddr->nsect_addr);
+               iowrite8(tf->hob_lbal, ioaddr->lbal_addr);
+               iowrite8(tf->hob_lbam, ioaddr->lbam_addr);
+               iowrite8(tf->hob_lbah, ioaddr->lbah_addr);
+               VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
+                       tf->hob_feature,
+                       tf->hob_nsect,
+                       tf->hob_lbal,
+                       tf->hob_lbam,
+                       tf->hob_lbah);
+       }
+
+       if (is_addr) {
+               iowrite8(tf->feature, ioaddr->feature_addr);
+               iowrite8(tf->nsect, ioaddr->nsect_addr);
+               iowrite8(tf->lbal, ioaddr->lbal_addr);
+               iowrite8(tf->lbam, ioaddr->lbam_addr);
+               iowrite8(tf->lbah, ioaddr->lbah_addr);
+               VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
+                       tf->feature,
+                       tf->nsect,
+                       tf->lbal,
+                       tf->lbam,
+                       tf->lbah);
+       }
+
+       if (tf->flags & ATA_TFLAG_DEVICE) {
+               iowrite8(tf->device, ioaddr->device_addr);
+               VPRINTK("device 0x%X\n", tf->device);
+       }
+
+       ata_wait_idle(ap);
+}
+
 static struct scsi_host_template via_sht = {
        ATA_BMDMA_SHT(DRV_NAME),
 };
@@ -332,11 +392,13 @@ static struct ata_port_operations via_port_ops = {
        .set_piomode    = via_set_piomode,
        .set_dmamode    = via_set_dmamode,
        .prereset       = via_pre_reset,
+       .sff_tf_load = via_ata_tf_load,
 };
 
 static struct ata_port_operations via_port_ops_noirq = {
        .inherits       = &via_port_ops,
        .sff_data_xfer  = ata_sff_data_xfer_noirq,
+       .sff_tf_load = via_ata_tf_load,
 };
 
 /**