[SCSI] isci: oem parameter format v1.3 (cable select)
v1.3 allows the attenuation of the attached cables to be specified to
the driver in terms of 'short', 'medium', and 'long' (see probe_roms.h).
These settings (per phy) are retrieved from the platform oem-parameters
(BIOS rom) or via a module parameter override.
Reviewed-by: Jiangbi Liu <jiangbi.liu@intel.com>
Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/isci/host.c b/drivers/scsi/isci/host.c
index ed1441c..9a52b98 100644
--- a/drivers/scsi/isci/host.c
+++ b/drivers/scsi/isci/host.c
@@ -1666,6 +1666,9 @@
/* Default to no SSC operation. */
ihost->oem_parameters.controller.do_enable_ssc = false;
+ /* Default to short cables on all phys. */
+ ihost->oem_parameters.controller.cable_selection_mask = 0;
+
/* Initialize all of the port parameter information to narrow ports. */
for (index = 0; index < SCI_MAX_PORTS; index++) {
ihost->oem_parameters.ports[index].phy_mask = 0;
@@ -1953,12 +1956,46 @@
static int is_long_cable(int phy, unsigned char selection_byte)
{
- return 0;
+ return !!(selection_byte & (1 << phy));
}
static int is_medium_cable(int phy, unsigned char selection_byte)
{
- return 0;
+ return !!(selection_byte & (1 << (phy + 4)));
+}
+
+static enum cable_selections decode_selection_byte(
+ int phy,
+ unsigned char selection_byte)
+{
+ return ((selection_byte & (1 << phy)) ? 1 : 0)
+ + (selection_byte & (1 << (phy + 4)) ? 2 : 0);
+}
+
+static unsigned char *to_cable_select(struct isci_host *ihost)
+{
+ if (is_cable_select_overridden())
+ return ((unsigned char *)&cable_selection_override)
+ + ihost->id;
+ else
+ return &ihost->oem_parameters.controller.cable_selection_mask;
+}
+
+enum cable_selections decode_cable_selection(struct isci_host *ihost, int phy)
+{
+ return decode_selection_byte(phy, *to_cable_select(ihost));
+}
+
+char *lookup_cable_names(enum cable_selections selection)
+{
+ static char *cable_names[] = {
+ [short_cable] = "short",
+ [long_cable] = "long",
+ [medium_cable] = "medium",
+ [undefined_cable] = "<undefined, assumed long>" /* bit 0==1 */
+ };
+ return (selection <= undefined_cable) ? cable_names[selection]
+ : cable_names[undefined_cable];
}
#define AFE_REGISTER_WRITE_DELAY 10
@@ -1967,10 +2004,10 @@
{
struct scu_afe_registers __iomem *afe = &ihost->scu_registers->afe;
const struct sci_oem_params *oem = &ihost->oem_parameters;
- unsigned char cable_selection_mask = 0;
struct pci_dev *pdev = ihost->pdev;
u32 afe_status;
u32 phy_id;
+ unsigned char cable_selection_mask = *to_cable_select(ihost);
/* Clear DFX Status registers */
writel(0x0081000f, &afe->afe_dfx_master_control0);