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authorJonathan Chocron <jonnyc@amazon.com>2019-09-12 16:02:38 +0300
committerLorenzo Pieralisi <lorenzo.pieralisi@arm.com>2019-09-16 14:17:15 +0100
commit0b24134f7888175c9638e6fd1900e23e44fc172f (patch)
tree085ed446d1c3e5c30d6c58d3df950a8701f4f159
parenta8daea94754989f6c48dafda840482cbc9f882f9 (diff)
downloadlinux-0b24134f7888175c9638e6fd1900e23e44fc172f.tar.bz2
PCI: dwc: Add validation that PCIe core is set to correct mode
Some PCIe controllers can be set to either Host or EP according to some early boot FW. To make sure there is no discrepancy (e.g. FW configured the port to EP mode while the DT specifies it as a host bridge or vice versa), a check has been added for each mode. Signed-off-by: Jonathan Chocron <jonnyc@amazon.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reviewed-by: Andrew Murray <andrew.murray@arm.com> Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
-rw-r--r--drivers/pci/controller/dwc/pcie-designware-ep.c8
-rw-r--r--drivers/pci/controller/dwc/pcie-designware-host.c16
2 files changed, 24 insertions, 0 deletions
diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 2bf5a35c0570..0b9a9b27175c 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -531,6 +531,7 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
int ret;
u32 reg;
void *addr;
+ u8 hdr_type;
unsigned int nbars;
unsigned int offset;
struct pci_epc *epc;
@@ -595,6 +596,13 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
if (ep->ops->ep_init)
ep->ops->ep_init(ep);
+ hdr_type = dw_pcie_readb_dbi(pci, PCI_HEADER_TYPE);
+ if (hdr_type != PCI_HEADER_TYPE_NORMAL) {
+ dev_err(pci->dev, "PCIe controller is not set to EP mode (hdr_type:0x%x)!\n",
+ hdr_type);
+ return -EIO;
+ }
+
ret = of_property_read_u8(np, "max-functions", &epc->max_functions);
if (ret < 0)
epc->max_functions = 1;
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index f93252d0da5b..bb275b5e787a 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -323,6 +323,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
struct pci_bus *child;
struct pci_host_bridge *bridge;
struct resource *cfg_res;
+ u32 hdr_type;
int ret;
raw_spin_lock_init(&pci->pp.lock);
@@ -464,6 +465,21 @@ int dw_pcie_host_init(struct pcie_port *pp)
goto err_free_msi;
}
+ ret = dw_pcie_rd_own_conf(pp, PCI_HEADER_TYPE, 1, &hdr_type);
+ if (ret != PCIBIOS_SUCCESSFUL) {
+ dev_err(pci->dev, "Failed reading PCI_HEADER_TYPE cfg space reg (ret: 0x%x)\n",
+ ret);
+ ret = pcibios_err_to_errno(ret);
+ goto err_free_msi;
+ }
+ if (hdr_type != PCI_HEADER_TYPE_BRIDGE) {
+ dev_err(pci->dev,
+ "PCIe controller is not set to bridge type (hdr_type: 0x%x)!\n",
+ hdr_type);
+ ret = -EIO;
+ goto err_free_msi;
+ }
+
pp->root_bus_nr = pp->busn->start;
bridge->dev.parent = dev;