@@ -8,6 +8,31 @@
#include "pcie-cadence.h"
+static u32 cdns_pcie_read_cfg(void *priv, int where, int size)
+{
+ struct cdns_pcie *pcie = priv;
+ u32 val;
+
+ if (size == 4)
+ val = readl(pcie->reg_base + where);
+ else if (size == 2)
+ val = readw(pcie->reg_base + where);
+ else if (size == 1)
+ val = readb(pcie->reg_base + where);
+
+ return val;
+}
+
+u8 cdns_pcie_find_capability(struct cdns_pcie *pcie, u8 cap)
+{
+ return pci_host_bridge_find_capability(pcie, cdns_pcie_read_cfg, cap);
+}
+
+u16 cdns_pcie_find_ext_capability(struct cdns_pcie *pcie, u8 cap)
+{
+ return pci_host_bridge_find_ext_capability(pcie, cdns_pcie_read_cfg, cap);
+}
+
void cdns_pcie_detect_quiet_min_delay_set(struct cdns_pcie *pcie)
{
u32 delay = 0x3;
@@ -557,6 +557,9 @@ static inline int cdns_pcie_ep_setup(struct cdns_pcie_ep *ep)
}
#endif
+u8 cdns_pcie_find_capability(struct cdns_pcie *pcie, u8 cap);
+u16 cdns_pcie_find_ext_capability(struct cdns_pcie *pcie, u8 cap);
+
void cdns_pcie_detect_quiet_min_delay_set(struct cdns_pcie *pcie);
void cdns_pcie_set_outbound_region(struct cdns_pcie *pcie, u8 busnr, u8 fn,
Since the PCI core is now exposing generic APIs for the host bridges to search for the PCIe capabilities, make use of them in the CDNS driver. Signed-off-by: Hans Zhang <18255117159@163.com> --- Changes since v4: https://lore.kernel.org/linux-pci/20250321101710.371480-4-18255117159@163.com/ - The patch subject and commit message were modified. Changes since v2~v3: https://lore.kernel.org/linux-pci/20250308133903.322216-1-18255117159@163.com/ https://lore.kernel.org/linux-pci/20250321040358.360755-4-18255117159@163.com/ - Introduce generic capability search functions Changes since v1: https://lore.kernel.org/linux-pci/20250123070935.1810110-1-18255117159@163.com - Added calling the new API in PCI-Cadence ep.c. - Add a commit message reason for adding the API. --- drivers/pci/controller/cadence/pcie-cadence.c | 25 +++++++++++++++++++ drivers/pci/controller/cadence/pcie-cadence.h | 3 +++ 2 files changed, 28 insertions(+)