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, 5 insertions, 2 deletions

diff --git a/drivers/ata/pata_mpc52xx.c b/drivers/ata/pata_mpc52xx.c
index a56694b2833e..412140f02853 100644
--- a/drivers/ata/pata_mpc52xx.c
+++ b/drivers/ata/pata_mpc52xx.c
@@ -302,7 +302,8 @@ static struct ata_port_operations mpc52xx_ata_port_ops = {
 };
 
 static int __devinit
-mpc52xx_ata_init_one(struct device *dev, struct mpc52xx_ata_priv *priv)
+mpc52xx_ata_init_one(struct device *dev, struct mpc52xx_ata_priv *priv,
+                     unsigned long raw_ata_regs)
 {
         struct ata_host *host;
         struct ata_port *ap;
@@ -336,6 +337,8 @@ mpc52xx_ata_init_one(struct device *dev, struct mpc52xx_ata_priv *priv)
         aio->status_addr        = &priv->ata_regs->tf_command;
         aio->command_addr       = &priv->ata_regs->tf_command;
 
+        ata_port_desc(ap, "ata_regs 0x%lx", raw_ata_regs);
+
         /* activate host */
         return ata_host_activate(host, priv->ata_irq, ata_interrupt, 0,
                                  &mpc52xx_ata_sht);
@@ -432,7 +435,7 @@ mpc52xx_ata_probe(struct of_device *op, const struct of_device_id *match)
         }
 
         /* Register ourselves to libata */
-        rv = mpc52xx_ata_init_one(&op->dev, priv);
+        rv = mpc52xx_ata_init_one(&op->dev, priv, res_mem.start);
         if (rv) {
                 printk(KERN_ERR DRV_NAME ": "
                         "Error while registering to ATA layer\n");