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-rw-r--r--drivers/ata/sata_nv.c41
1 files changed, 39 insertions, 2 deletions
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
index 19817b37616..aea005d5663 100644
--- a/drivers/ata/sata_nv.c
+++ b/drivers/ata/sata_nv.c
@@ -512,14 +512,38 @@ static void nv_adma_register_mode(struct ata_port *ap)
{
struct nv_adma_port_priv *pp = ap->private_data;
void __iomem *mmio = pp->ctl_block;
- u16 tmp;
+ u16 tmp, status;
+ int count = 0;
if (pp->flags & NV_ADMA_PORT_REGISTER_MODE)
return;
+ status = readw(mmio + NV_ADMA_STAT);
+ while(!(status & NV_ADMA_STAT_IDLE) && count < 20) {
+ ndelay(50);
+ status = readw(mmio + NV_ADMA_STAT);
+ count++;
+ }
+ if(count == 20)
+ ata_port_printk(ap, KERN_WARNING,
+ "timeout waiting for ADMA IDLE, stat=0x%hx\n",
+ status);
+
tmp = readw(mmio + NV_ADMA_CTL);
writew(tmp & ~NV_ADMA_CTL_GO, mmio + NV_ADMA_CTL);
+ count = 0;
+ status = readw(mmio + NV_ADMA_STAT);
+ while(!(status & NV_ADMA_STAT_LEGACY) && count < 20) {
+ ndelay(50);
+ status = readw(mmio + NV_ADMA_STAT);
+ count++;
+ }
+ if(count == 20)
+ ata_port_printk(ap, KERN_WARNING,
+ "timeout waiting for ADMA LEGACY, stat=0x%hx\n",
+ status);
+
pp->flags |= NV_ADMA_PORT_REGISTER_MODE;
}
@@ -527,7 +551,8 @@ static void nv_adma_mode(struct ata_port *ap)
{
struct nv_adma_port_priv *pp = ap->private_data;
void __iomem *mmio = pp->ctl_block;
- u16 tmp;
+ u16 tmp, status;
+ int count = 0;
if (!(pp->flags & NV_ADMA_PORT_REGISTER_MODE))
return;
@@ -537,6 +562,18 @@ static void nv_adma_mode(struct ata_port *ap)
tmp = readw(mmio + NV_ADMA_CTL);
writew(tmp | NV_ADMA_CTL_GO, mmio + NV_ADMA_CTL);
+ status = readw(mmio + NV_ADMA_STAT);
+ while(((status & NV_ADMA_STAT_LEGACY) ||
+ !(status & NV_ADMA_STAT_IDLE)) && count < 20) {
+ ndelay(50);
+ status = readw(mmio + NV_ADMA_STAT);
+ count++;
+ }
+ if(count == 20)
+ ata_port_printk(ap, KERN_WARNING,
+ "timeout waiting for ADMA LEGACY clear and IDLE, stat=0x%hx\n",
+ status);
+
pp->flags &= ~NV_ADMA_PORT_REGISTER_MODE;
}