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authorDave Jiang <dave.jiang@intel.com>2014-08-28 13:53:13 -0700
committerJon Mason <jdmason@kudzu.us>2014-10-17 07:08:50 -0400
commit1db97f258966878317ece10868eaca99201d5884 (patch)
tree3e4449c9c4eda5aaeeca60cbf4d0a10875e4cf14 /drivers/ntb
parentb775e85bdb0395077a23bc072c4a62986883e276 (diff)
downloadblackbird-op-linux-1db97f258966878317ece10868eaca99201d5884.tar.gz
blackbird-op-linux-1db97f258966878317ece10868eaca99201d5884.zip
ntb: conslidate reading of PPD to move platform detection earlier
To simplify some of the platform detection code. Move the platform detection to a function to be called earlier. Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Jon Mason <jdmason@kudzu.us>
Diffstat (limited to 'drivers/ntb')
-rw-r--r--drivers/ntb/ntb_hw.c126
1 files changed, 98 insertions, 28 deletions
diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c
index 7567452250df..6f1c92182f35 100644
--- a/drivers/ntb/ntb_hw.c
+++ b/drivers/ntb/ntb_hw.c
@@ -702,24 +702,8 @@ static void bwd_link_poll(struct work_struct *work)
static int ntb_xeon_setup(struct ntb_device *ndev)
{
- int rc;
- u8 val;
-
- ndev->hw_type = SNB_HW;
-
- rc = pci_read_config_byte(ndev->pdev, NTB_PPD_OFFSET, &val);
- if (rc)
- return rc;
-
- if (val & SNB_PPD_DEV_TYPE)
- ndev->dev_type = NTB_DEV_USD;
- else
- ndev->dev_type = NTB_DEV_DSD;
-
- switch (val & SNB_PPD_CONN_TYPE) {
+ switch (ndev->conn_type) {
case NTB_CONN_B2B:
- dev_info(&ndev->pdev->dev, "Conn Type = B2B\n");
- ndev->conn_type = NTB_CONN_B2B;
ndev->reg_ofs.ldb = ndev->reg_base + SNB_PDOORBELL_OFFSET;
ndev->reg_ofs.ldb_mask = ndev->reg_base + SNB_PDBMSK_OFFSET;
ndev->reg_ofs.spad_read = ndev->reg_base + SNB_SPAD_OFFSET;
@@ -835,9 +819,6 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
}
break;
case NTB_CONN_RP:
- dev_info(&ndev->pdev->dev, "Conn Type = RP\n");
- ndev->conn_type = NTB_CONN_RP;
-
if (xeon_errata_workaround) {
dev_err(&ndev->pdev->dev,
"NTB-RP disabled due to hardware errata. To disregard this warning and potentially lock-up the system, add the parameter 'xeon_errata_workaround=0'.\n");
@@ -867,8 +848,6 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
ndev->limits.max_mw = SNB_MAX_MW;
break;
case NTB_CONN_TRANSPARENT:
- dev_info(&ndev->pdev->dev, "Conn Type = TRANSPARENT\n");
- ndev->conn_type = NTB_CONN_TRANSPARENT;
/* Scratch pads need to have exclusive access from the primary
* or secondary side. Halve the num spads so that each side can
* have an equal amount.
@@ -890,10 +869,10 @@ static int ntb_xeon_setup(struct ntb_device *ndev)
ndev->limits.max_mw = SNB_MAX_MW;
break;
default:
- /* Most likely caused by the remote NTB-RP device not being
- * configured
+ /*
+ * we should never hit this. the detect function should've
+ * take cared of everything.
*/
- dev_err(&ndev->pdev->dev, "Unknown PPD %x\n", val);
return -EINVAL;
}
@@ -977,9 +956,6 @@ static int ntb_device_setup(struct ntb_device *ndev)
if (rc)
return rc;
- dev_info(&ndev->pdev->dev, "Device Type = %s\n",
- ndev->dev_type == NTB_DEV_USD ? "USD/DSP" : "DSD/USP");
-
if (ndev->conn_type == NTB_CONN_B2B)
/* Enable Bus Master and Memory Space on the secondary side */
writew(PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER,
@@ -1519,6 +1495,96 @@ static void ntb_hw_link_down(struct ntb_device *ndev)
writel(ntb_cntl, ndev->reg_ofs.lnk_cntl);
}
+static int ntb_xeon_detect(struct ntb_device *ndev)
+{
+ int rc;
+ u8 ppd;
+
+ ndev->hw_type = SNB_HW;
+
+ rc = pci_read_config_byte(ndev->pdev, NTB_PPD_OFFSET, &ppd);
+ if (rc)
+ return -EIO;
+
+ if (ppd & SNB_PPD_DEV_TYPE)
+ ndev->dev_type = NTB_DEV_USD;
+ else
+ ndev->dev_type = NTB_DEV_DSD;
+
+ switch (ppd & SNB_PPD_CONN_TYPE) {
+ case NTB_CONN_B2B:
+ dev_info(&ndev->pdev->dev, "Conn Type = B2B\n");
+ ndev->conn_type = NTB_CONN_B2B;
+ break;
+ case NTB_CONN_RP:
+ dev_info(&ndev->pdev->dev, "Conn Type = RP\n");
+ ndev->conn_type = NTB_CONN_RP;
+ break;
+ case NTB_CONN_TRANSPARENT:
+ dev_info(&ndev->pdev->dev, "Conn Type = TRANSPARENT\n");
+ ndev->conn_type = NTB_CONN_TRANSPARENT;
+ /*
+ * This mode is default to USD/DSP. HW does not report
+ * properly in transparent mode as it has no knowledge of
+ * NTB. We will just force correct here.
+ */
+ ndev->dev_type = NTB_DEV_USD;
+ break;
+ default:
+ dev_err(&ndev->pdev->dev, "Unknown PPD %x\n", ppd);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int ntb_atom_detect(struct ntb_device *ndev)
+{
+ int rc;
+ u32 ppd;
+
+ ndev->hw_type = BWD_HW;
+
+ rc = pci_read_config_dword(ndev->pdev, NTB_PPD_OFFSET, &ppd);
+ if (rc)
+ return rc;
+
+ switch ((ppd & BWD_PPD_CONN_TYPE) >> 8) {
+ case NTB_CONN_B2B:
+ dev_info(&ndev->pdev->dev, "Conn Type = B2B\n");
+ ndev->conn_type = NTB_CONN_B2B;
+ break;
+ case NTB_CONN_RP:
+ default:
+ dev_err(&ndev->pdev->dev, "Unsupported NTB configuration\n");
+ return -EINVAL;
+ }
+
+ if (ppd & BWD_PPD_DEV_TYPE)
+ ndev->dev_type = NTB_DEV_DSD;
+ else
+ ndev->dev_type = NTB_DEV_USD;
+
+ return 0;
+}
+
+static int ntb_device_detect(struct ntb_device *ndev)
+{
+ int rc;
+
+ if (is_ntb_xeon(ndev))
+ rc = ntb_xeon_detect(ndev);
+ else if (is_ntb_atom(ndev))
+ rc = ntb_atom_detect(ndev);
+ else
+ rc = -ENODEV;
+
+ dev_info(&ndev->pdev->dev, "Device Type = %s\n",
+ ndev->dev_type == NTB_DEV_USD ? "USD/DSP" : "DSD/USP");
+
+ return 0;
+}
+
static int ntb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct ntb_device *ndev;
@@ -1539,6 +1605,10 @@ static int ntb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
pci_set_master(ndev->pdev);
+ rc = ntb_device_detect(ndev);
+ if (rc)
+ goto err;
+
rc = pci_request_selected_regions(pdev, NTB_BAR_MASK, KBUILD_MODNAME);
if (rc)
goto err1;
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