On 03/10/2010 03:32 PM, Matthew Garrett wrote:
+static int ahci_is_device_present(struct ata_port *ap)
+{
+ void __iomem *port_mmio = ahci_port_base(ap);
+ u8 status = readl(port_mmio + PORT_TFDATA)& 0xff;
+
+ /* Make sure PxTFD.STS.BSY and PxTFD.STS.DRQ are 0 */
+ if (status& (ATA_BUSY | ATA_DRQ))
+ return 0;
+
+ /* Make sure PxSSTS.DET is 3h */
+ status = readl(port_mmio + PORT_SCR_STAT)& 0xf;
+ if (status != 3)
+ return 0;
+ return 1;
Note that this last test, reading SATA Control Register (SCR) Status,
does not account for in-transition status, ie. devices that were just
plugged in.
Jeff
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