[SCSI] aic79xx: make driver respect nvram for IU and QAS settings

This patch allows the Adaptec firmware to pass on its values for Packetize and
QAS.  To do this, the settings max_iu and max_qas have been introduced into
the SPI transport class and populated from the adaptec NVram tables.  Domain
validation in the SPI transport class will respect the max settings when
configuring to the highest possible speed for testing.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 14 insertions, 4 deletions

diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index f49f55c6bfc8..654a34fb04cb 100644
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -234,8 +234,10 @@ static int spi_setup_transport_attrs(struct transport_container *tc,
         spi_width(starget) = 0; /* narrow */
         spi_max_width(starget) = 1;
         spi_iu(starget) = 0;    /* no IU */
+        spi_max_iu(starget) = 1;
         spi_dt(starget) = 0;    /* ST */
         spi_qas(starget) = 0;
+        spi_max_qas(starget) = 1;
         spi_wr_flow(starget) = 0;
         spi_rd_strm(starget) = 0;
         spi_rti(starget) = 0;
@@ -360,9 +362,9 @@ static DEVICE_ATTR(field, S_IRUGO,				\
 /* The Parallel SCSI Tranport Attributes: */
 spi_transport_max_attr(offset, "%d\n");
 spi_transport_max_attr(width, "%d\n");
-spi_transport_rd_attr(iu, "%d\n");
+spi_transport_max_attr(iu, "%d\n");
 spi_transport_rd_attr(dt, "%d\n");
-spi_transport_rd_attr(qas, "%d\n");
+spi_transport_max_attr(qas, "%d\n");
 spi_transport_rd_attr(wr_flow, "%d\n");
 spi_transport_rd_attr(rd_strm, "%d\n");
 spi_transport_rd_attr(rti, "%d\n");
@@ -874,13 +876,13 @@ spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
 
         /* try QAS requests; this should be harmless to set if the
          * target supports it */
-        if (scsi_device_qas(sdev)) {
+        if (scsi_device_qas(sdev) && spi_max_qas(starget)) {
                 DV_SET(qas, 1);
         } else {
                 DV_SET(qas, 0);
         }
 
-        if (scsi_device_ius(sdev) && min_period < 9) {
+        if (scsi_device_ius(sdev) && spi_max_iu(starget) && min_period < 9) {
                 /* This u320 (or u640). Set IU transfers */
                 DV_SET(iu, 1);
                 /* Then set the optional parameters */
@@ -1412,12 +1414,18 @@ static mode_t target_attribute_is_visible(struct kobject *kobj,
         else if (attr == &dev_attr_iu.attr &&
                  spi_support_ius(starget))
                 return TARGET_ATTRIBUTE_HELPER(iu);
+        else if (attr == &dev_attr_max_iu.attr &&
+                 spi_support_ius(starget))
+                return TARGET_ATTRIBUTE_HELPER(iu);
         else if (attr == &dev_attr_dt.attr &&
                  spi_support_dt(starget))
                 return TARGET_ATTRIBUTE_HELPER(dt);
         else if (attr == &dev_attr_qas.attr &&
                  spi_support_qas(starget))
                 return TARGET_ATTRIBUTE_HELPER(qas);
+        else if (attr == &dev_attr_max_qas.attr &&
+                 spi_support_qas(starget))
+                return TARGET_ATTRIBUTE_HELPER(qas);
         else if (attr == &dev_attr_wr_flow.attr &&
                  spi_support_ius(starget))
                 return TARGET_ATTRIBUTE_HELPER(wr_flow);
@@ -1447,8 +1455,10 @@ static struct attribute *target_attributes[] = {
         &dev_attr_width.attr,
         &dev_attr_max_width.attr,
         &dev_attr_iu.attr,
+        &dev_attr_max_iu.attr,
         &dev_attr_dt.attr,
         &dev_attr_qas.attr,
+        &dev_attr_max_qas.attr,
         &dev_attr_wr_flow.attr,
         &dev_attr_rd_strm.attr,
         &dev_attr_rti.attr,