libata: implement and use ata_port_desc() to report port configuration

Currently, port configuration reporting has the following problems.

* iomapped address is reported instead of raw address
* report contains irrelevant fields or lacks necessary fields for
  non-SFF controllers.
* host->irq/irq2 are there just for reporting and hacky.

This patch implements and uses ata_port_desc() and
ata_port_pbar_desc().  ata_port_desc() is almost identical to
ata_ehi_push_desc() except that it takes @ap instead of @ehi, has no
locking requirement, can only be used during host initialization and "
" is used as separator instead of ", ".  ata_port_pbar_desc() is a
helper to ease reporting of a PCI BAR or an offsetted address into it.

LLD pushes whatever description it wants using the above two
functions.  The accumulated description is printed on host
registration after "[S/P]ATA max MAX_XFERMODE ".

SFF init helpers and ata_host_activate() automatically add
descriptions for addresses and irq respectively, so only LLDs which
isn't standard SFF need to add custom descriptions.  In many cases,
such controllers need to report different things anyway.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 10 insertions, 6 deletions

diff --git a/drivers/ata/pata_mpiix.c b/drivers/ata/pata_mpiix.c
index cb78b7bfe143..d5483087a3fa 100644
--- a/drivers/ata/pata_mpiix.c
+++ b/drivers/ata/pata_mpiix.c
@@ -201,7 +201,7 @@ static int mpiix_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 	struct ata_port *ap;
 	void __iomem *cmd_addr, *ctl_addr;
 	u16 idetim;
-	int irq;
+	int cmd, ctl, irq;
 
 	if (!printed_version++)
 		dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
@@ -209,6 +209,7 @@ static int mpiix_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 	host = ata_host_alloc(&dev->dev, 1);
 	if (!host)
 		return -ENOMEM;
+	ap = host->ports[0];
 
 	/* MPIIX has many functions which can be turned on or off according
 	   to other devices present. Make sure IDE is enabled before we try
@@ -220,25 +221,28 @@ static int mpiix_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 
 	/* See if it's primary or secondary channel... */
 	if (!(idetim & SECONDARY)) {
+		cmd = 0x1F0;
+		ctl = 0x3F6;
 		irq = 14;
-		cmd_addr = devm_ioport_map(&dev->dev, 0x1F0, 8);
-		ctl_addr = devm_ioport_map(&dev->dev, 0x3F6, 1);
 	} else {
+		cmd = 0x170;
+		ctl = 0x376;
 		irq = 15;
-		cmd_addr = devm_ioport_map(&dev->dev, 0x170, 8);
-		ctl_addr = devm_ioport_map(&dev->dev, 0x376, 1);
 	}
 
+	cmd_addr = devm_ioport_map(&dev->dev, cmd, 8);
+	ctl_addr = devm_ioport_map(&dev->dev, ctl, 1);
 	if (!cmd_addr || !ctl_addr)
 		return -ENOMEM;
 
+	ata_port_desc(ap, "cmd 0x%x ctl 0x%x", cmd, ctl);
+
 	/* We do our own plumbing to avoid leaking special cases for whacko
 	   ancient hardware into the core code. There are two issues to
 	   worry about.  #1 The chip is a bridge so if in legacy mode and
 	   without BARs set fools the setup.  #2 If you pci_disable_device
 	   the MPIIX your box goes castors up */
 
-	ap = host->ports[0];
 	ap->ops = &mpiix_port_ops;
 	ap->pio_mask = 0x1F;
 	ap->flags |= ATA_FLAG_SLAVE_POSS;