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ntb: conslidate reading of PPD to move platform detection earlier

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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>
This commit is contained in:
Dave Jiang 2014-08-28 13:53:13 -07:00 committed by Jon Mason
parent b775e85bdb
commit 1db97f2589
1 changed files with 98 additions and 28 deletions
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126
drivers/ntb/ntb_hw.c
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@ -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;