From: Jeff Skirvin <jeffrey.d.skirvin@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@xxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
drivers/scsi/isci/host.c | 43 +++++++++++++++++++++++++++++++++++++---
drivers/scsi/isci/host.h | 18 +++++++++++++++++
drivers/scsi/isci/init.c | 16 +++++++++++++++
drivers/scsi/isci/isci.h | 1 +
drivers/scsi/isci/probe_roms.h | 38 +++++++++++++++++++++++++++++++++--
5 files changed, 111 insertions(+), 5 deletions(-)
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 @@ 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);
diff --git a/drivers/scsi/isci/host.h b/drivers/scsi/isci/host.h
index 4573075..5477f0f 100644
--- a/drivers/scsi/isci/host.h
+++ b/drivers/scsi/isci/host.h
@@ -447,6 +447,24 @@ static inline bool is_c1(struct pci_dev *pdev)
return false;
}
+enum cable_selections {
+ short_cable = 0,
+ long_cable = 1,
+ medium_cable = 2,
+ undefined_cable = 3
+};
+
+#define CABLE_OVERRIDE_DISABLED (0x10000)
+
+static inline int is_cable_select_overridden(void)
+{
+ return cable_selection_override < CABLE_OVERRIDE_DISABLED;
+}
+
+enum cable_selections decode_cable_selection(struct isci_host *ihost, int phy);
+void validate_cable_selections(struct isci_host *ihost);
+char *lookup_cable_names(enum cable_selections);
+
/* set hw control for 'activity', even though active enclosures seem to drive
* the activity led on their own. Skip setting FSENG control on 'status' due
* to unexpected operation and 'error' due to not being a supported automatic
diff --git a/drivers/scsi/isci/init.c b/drivers/scsi/isci/init.c
index 8a34fd9..1047108 100644
--- a/drivers/scsi/isci/init.c
+++ b/drivers/scsi/isci/init.c
@@ -122,6 +122,14 @@ unsigned char max_concurr_spinup;
module_param(max_concurr_spinup, byte, 0);
MODULE_PARM_DESC(max_concurr_spinup, "Max concurrent device spinup");
+uint cable_selection_override = CABLE_OVERRIDE_DISABLED;
+module_param(cable_selection_override, uint, 0);
+
+MODULE_PARM_DESC(cable_selection_override,
+ "This field indicates length of the SAS/SATA cable between "
+ "host and device. If any bits > 15 are set (default) "
+ "indicates \"use platform defaults\"");
+
static ssize_t isci_show_id(struct device *dev, struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = container_of(dev, typeof(*shost), shost_dev);
@@ -412,6 +420,14 @@ static struct isci_host *isci_host_alloc(struct pci_dev *pdev, int id)
return NULL;
isci_host->shost = shost;
+ dev_info(&pdev->dev, "%sSCU controller %d: phy 3-0 cables: "
+ "{%s, %s, %s, %s}\n",
+ (is_cable_select_overridden() ? "* " : ""), isci_host->id,
+ lookup_cable_names(decode_cable_selection(isci_host, 3)),
+ lookup_cable_names(decode_cable_selection(isci_host, 2)),
+ lookup_cable_names(decode_cable_selection(isci_host, 1)),
+ lookup_cable_names(decode_cable_selection(isci_host, 0)));
+
err = isci_host_init(isci_host);
if (err)
goto err_shost;
diff --git a/drivers/scsi/isci/isci.h b/drivers/scsi/isci/isci.h
index 8efeb6b..234ab46 100644
--- a/drivers/scsi/isci/isci.h
+++ b/drivers/scsi/isci/isci.h
@@ -480,6 +480,7 @@ extern u16 ssp_inactive_to;
extern u16 stp_inactive_to;
extern unsigned char phy_gen;
extern unsigned char max_concurr_spinup;
+extern uint cable_selection_override;
irqreturn_t isci_msix_isr(int vec, void *data);
irqreturn_t isci_intx_isr(int vec, void *data);
diff --git a/drivers/scsi/isci/probe_roms.h b/drivers/scsi/isci/probe_roms.h
index 42dd054..bb0e9d4 100644
--- a/drivers/scsi/isci/probe_roms.h
+++ b/drivers/scsi/isci/probe_roms.h
@@ -193,7 +193,8 @@ struct isci_oem_hdr {
#define ISCI_ROM_VER_1_0 0x10
#define ISCI_ROM_VER_1_1 0x11
-#define ISCI_ROM_VER_LATEST ISCI_ROM_VER_1_1
+#define ISCI_ROM_VER_1_3 0x13
+#define ISCI_ROM_VER_LATEST ISCI_ROM_VER_1_3
/* Allowed PORT configuration modes APC Automatic PORT configuration mode is
* defined by the OEM configuration parameters providing no PHY_MASK parameters
@@ -270,7 +271,40 @@ struct sci_oem_params {
};
uint8_t do_enable_ssc;
};
- uint8_t reserved;
+ /*
+ * This field indicates length of the SAS/SATA cable between
+ * host and device.
+ * This field is used make relationship between analog
+ * parameters of the phy in the silicon and length of the cable.
+ * Supported cable attenuation levels:
+ * "short"- up to 3m, "medium"-3m to 6m, and "long"- more than
+ * 6m.
+ *
+ * This is bit mask field:
+ *
+ * BIT: (MSB) 7 6 5 4
+ * ASSIGNMENT: <phy3><phy2><phy1><phy0> - Medium cable
+ * length assignment
+ * BIT: 3 2 1 0 (LSB)
+ * ASSIGNMENT: <phy3><phy2><phy1><phy0> - Long cable length
+ * assignment
+ *
+ * BITS 7-4 are set when the cable length is assigned to medium
+ * BITS 3-0 are set when the cable length is assigned to long
+ *
+ * The BIT positions are clear when the cable length is
+ * assigned to short.
+ *
+ * Setting the bits for both long and medium cable length is
+ * undefined.
+ *
+ * A value of 0x84 would assign
+ * phy3 - medium
+ * phy2 - long
+ * phy1 - short
+ * phy0 - short
+ */
+ uint8_t cable_selection_mask;
} controller;
struct {
--
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