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PCI: dwc: ep: Implement capability search using PCI core APIs

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The PCI core now provides generic PCI_FIND_NEXT_CAP() macros to search for
PCI capabilities, using config accessors we supply.

Use them in the DWC EP driver to implement dw_pcie_ep_find_capability()
instead of duplicating the algorithm.

Signed-off-by: Hans Zhang <18255117159@163.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20250819145828.438541-1-18255117159@163.com
This commit is contained in:
Hans Zhang 2025-08-19 22:58:28 +08:00 committed by Bjorn Helgaas
parent 8ffc9f234f
commit 3a33020d22
2 changed files with 23 additions and 29 deletions
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31
drivers/pci/controller/dwc/pcie-designware-ep.c
View File

@ -69,37 +69,10 @@ void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
}
EXPORT_SYMBOL_GPL(dw_pcie_ep_reset_bar);
static u8 __dw_pcie_ep_find_next_cap(struct dw_pcie_ep *ep, u8 func_no,
u8 cap_ptr, u8 cap)
{
u8 cap_id, next_cap_ptr;
u16 reg;
if (!cap_ptr)
return 0;
reg = dw_pcie_ep_readw_dbi(ep, func_no, cap_ptr);
cap_id = (reg & 0x00ff);
if (cap_id > PCI_CAP_ID_MAX)
return 0;
if (cap_id == cap)
return cap_ptr;
next_cap_ptr = (reg & 0xff00) >> 8;
return __dw_pcie_ep_find_next_cap(ep, func_no, next_cap_ptr, cap);
}
static u8 dw_pcie_ep_find_capability(struct dw_pcie_ep *ep, u8 func_no, u8 cap)
{
u8 next_cap_ptr;
u16 reg;
reg = dw_pcie_ep_readw_dbi(ep, func_no, PCI_CAPABILITY_LIST);
next_cap_ptr = (reg & 0x00ff);
return __dw_pcie_ep_find_next_cap(ep, func_no, next_cap_ptr, cap);
return PCI_FIND_NEXT_CAP(dw_pcie_ep_read_cfg, PCI_CAPABILITY_LIST,
cap, ep, func_no);
}
/**

21
drivers/pci/controller/dwc/pcie-designware.h
View File

@ -695,6 +695,27 @@ static inline u8 dw_pcie_ep_readb_dbi(struct dw_pcie_ep *ep, u8 func_no,
return dw_pcie_ep_read_dbi(ep, func_no, reg, 0x1);
}
static inline int dw_pcie_ep_read_cfg_byte(struct dw_pcie_ep *ep, u8 func_no,
int where, u8 *val)
{
*val = dw_pcie_ep_readb_dbi(ep, func_no, where);
return PCIBIOS_SUCCESSFUL;
}
static inline int dw_pcie_ep_read_cfg_word(struct dw_pcie_ep *ep, u8 func_no,
int where, u16 *val)
{
*val = dw_pcie_ep_readw_dbi(ep, func_no, where);
return PCIBIOS_SUCCESSFUL;
}
static inline int dw_pcie_ep_read_cfg_dword(struct dw_pcie_ep *ep, u8 func_no,
int where, u32 *val)
{
*val = dw_pcie_ep_readl_dbi(ep, func_no, where);
return PCIBIOS_SUCCESSFUL;
}
static inline unsigned int dw_pcie_ep_get_dbi2_offset(struct dw_pcie_ep *ep,
u8 func_no)
{