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PCI: dwc: Add helper to find the Vendor Specific Extended Capability (VSEC)

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The new dw_pcie_find_vsec_capability() helper will be used within
different DWC APIs to find the VSEC capabilities like PTM, RAS, etc.

Co-developed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Shradha Todi <shradha.t@samsung.com>
Reviewed-by: Fan Ni <fan.ni@samsung.com>
Tested-by: Hrishikesh Deleep <hrishikesh.d@samsung.com>
Link: https://lore.kernel.org/r/20250221131548.59616-3-shradha.t@samsung.com
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
This commit is contained in:
Shradha Todi 2025-02-21 18:45:45 +05:30 committed by Krzysztof Wilczyński
parent 5d2b978ff9
commit efaf16de43
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1 changed files with 40 additions and 0 deletions
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40
drivers/pci/controller/dwc/pcie-designware.c
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@ -16,6 +16,7 @@
#include <linux/gpio/consumer.h>
#include <linux/ioport.h>
#include <linux/of.h>
#include <linux/pcie-dwc.h>
#include <linux/platform_device.h>
#include <linux/sizes.h>
#include <linux/types.h>
@ -283,6 +284,45 @@ u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap)
}
EXPORT_SYMBOL_GPL(dw_pcie_find_ext_capability);
static u16 __dw_pcie_find_vsec_capability(struct dw_pcie *pci, u16 vendor_id,
u16 vsec_id)
{
u16 vsec = 0;
u32 header;
if (vendor_id != dw_pcie_readw_dbi(pci, PCI_VENDOR_ID))
return 0;
while ((vsec = dw_pcie_find_next_ext_capability(pci, vsec,
PCI_EXT_CAP_ID_VNDR))) {
header = dw_pcie_readl_dbi(pci, vsec + PCI_VNDR_HEADER);
if (PCI_VNDR_HEADER_ID(header) == vsec_id)
return vsec;
}
return 0;
}
static u16 dw_pcie_find_vsec_capability(struct dw_pcie *pci,
const struct dwc_pcie_vsec_id *vsec_ids)
{
const struct dwc_pcie_vsec_id *vid;
u16 vsec;
u32 header;
for (vid = vsec_ids; vid->vendor_id; vid++) {
vsec = __dw_pcie_find_vsec_capability(pci, vid->vendor_id,
vid->vsec_id);
if (vsec) {
header = dw_pcie_readl_dbi(pci, vsec + PCI_VNDR_HEADER);
if (PCI_VNDR_HEADER_REV(header) == vid->vsec_rev)
return vsec;
}
}
return 0;
}
int dw_pcie_read(void __iomem *addr, int size, u32 *val)
{
if (!IS_ALIGNED((uintptr_t)addr, size)) {