[patch 1/3] libata: check for AN support

[Kristen Carlson Accardi]

Check to see if an ATAPI device supports Asynchronous Notification.
If so, enable it.

Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@xxxxxxxxx>

Index: 2.6-mm/drivers/ata/libata-core.c
===================================================================
--- 2.6-mm.orig/drivers/ata/libata-core.c
+++ 2.6-mm/drivers/ata/libata-core.c
@@ -71,6 +71,7 @@ const unsigned long sata_deb_timing_long
 static unsigned int ata_dev_init_params(struct ata_device *dev,
 					u16 heads, u16 sectors);
 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
+static unsigned int ata_dev_set_AN(struct ata_device *dev);
 static void ata_dev_xfermask(struct ata_device *dev);
 
 static unsigned int ata_print_id = 1;
@@ -1745,6 +1746,23 @@ int ata_dev_configure(struct ata_device 
 		}
 		dev->cdb_len = (unsigned int) rc;
 
+		/*
+		 * check to see if this ATAPI device supports
+		 * Asynchronous Notification
+		 */
+		if (ata_id_has_AN(id))
+		{
+			/* issue SET feature command to turn this on */
+			rc = ata_dev_set_AN(dev);
+			if (rc) {
+				ata_dev_printk(dev, KERN_ERR,
+						"unable to set AN\n");
+				rc = -EINVAL;
+				goto err_out_nosup;
+			}
+			dev->flags |= ATA_DFLAG_AN;
+		}
+
 		if (ata_id_cdb_intr(dev->id)) {
 			dev->flags |= ATA_DFLAG_CDB_INTR;
 			cdb_intr_string = ", CDB intr";
@@ -3642,6 +3660,42 @@ static unsigned int ata_dev_set_xfermode
 }
 
 /**
+ *	ata_dev_set_AN - Issue SET FEATURES - SATA FEATURES
+ *                       with sector count set to indicate
+ *                       Asynchronous Notification feature
+ *	@dev: Device to which command will be sent
+ *
+ *	Issue SET FEATURES - SATA FEATURES command to device @dev
+ *	on port @ap.
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	0 on success, AC_ERR_* mask otherwise.
+ */
+static unsigned int ata_dev_set_AN(struct ata_device *dev)
+{
+	struct ata_taskfile tf;
+	unsigned int err_mask;
+
+	/* set up set-features taskfile */
+	DPRINTK("set features - SATA features\n");
+
+	ata_tf_init(dev, &tf);
+	tf.command = ATA_CMD_SET_FEATURES;
+	tf.feature = SETFEATURES_SATA_ENABLE;
+	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	tf.protocol = ATA_PROT_NODATA;
+	tf.nsect = SATA_AN;
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
+
+	DPRINTK("EXIT, err_mask=%x\n", err_mask);
+	return err_mask;
+}
+
+/**
  *	ata_dev_init_params - Issue INIT DEV PARAMS command
  *	@dev: Device to which command will be sent
  *	@heads: Number of heads (taskfile parameter)
Index: 2.6-mm/include/linux/ata.h
===================================================================
--- 2.6-mm.orig/include/linux/ata.h
+++ 2.6-mm/include/linux/ata.h
@@ -193,6 +193,12 @@ enum {
 	SETFEATURES_WC_ON	= 0x02, /* Enable write cache */
 	SETFEATURES_WC_OFF	= 0x82, /* Disable write cache */
 
+	SETFEATURES_SATA_ENABLE = 0x10, /* Enable use of SATA feature */
+	SETFEATURES_SATA_DISABLE = 0x90, /* Disable use of SATA feature */
+
+	/* SETFEATURE Sector counts for SATA features */
+	SATA_AN			= 0x05,  /* Asynchronous Notification */
+
 	/* ATAPI stuff */
 	ATAPI_PKT_DMA		= (1 << 0),
 	ATAPI_DMADIR		= (1 << 2),	/* ATAPI data dir:
@@ -298,6 +304,8 @@ struct ata_taskfile {
 #define ata_id_queue_depth(id)	(((id)[75] & 0x1f) + 1)
 #define ata_id_removeable(id)	((id)[0] & (1 << 7))
 #define ata_id_has_dword_io(id)	((id)[50] & (1 << 0))
+#define ata_id_has_AN(id)	\
+	((id[76] && (~id[76])) & ((id)[78] & (1 << 5)))
 #define ata_id_iordy_disable(id) ((id)[49] & (1 << 10))
 #define ata_id_has_iordy(id) ((id)[49] & (1 << 9))
 #define ata_id_u32(id,n)	\
Index: 2.6-mm/include/linux/libata.h
===================================================================
--- 2.6-mm.orig/include/linux/libata.h
+++ 2.6-mm/include/linux/libata.h
@@ -136,6 +136,7 @@ enum {
 	ATA_DFLAG_CDB_INTR	= (1 << 2), /* device asserts INTRQ when ready for CDB */
 	ATA_DFLAG_NCQ		= (1 << 3), /* device supports NCQ */
 	ATA_DFLAG_FLUSH_EXT	= (1 << 4), /* do FLUSH_EXT instead of FLUSH */
+	ATA_DFLAG_AN		= (1 << 5), /* device supports Async notification */
 	ATA_DFLAG_CFG_MASK	= (1 << 8) - 1,
 
 	ATA_DFLAG_PIO		= (1 << 8), /* device limited to PIO mode */

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