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[SCSI] isci: oem parameter format v1.3 (cable select)

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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>
This commit is contained in:
Jeff Skirvin
2012-01-04 01:32:49 -08:00
committed by James Bottomley
parent 594e566ae5
commit 9fee607f0b
5 changed files with 111 additions and 5 deletions
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43
drivers/scsi/isci/host.c
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@@ -1666,6 +1666,9 @@ static void sci_controller_set_default_config_parameters(struct isci_host *ihost
/* 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 @@ void sci_controller_power_control_queue_remove(struct isci_host *ihost,
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 @@ static void sci_controller_afe_initialization(struct isci_host *ihost)
{
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);