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Message-Id: <20250321040358.360755-5-18255117159@163.com>
Date: Fri, 21 Mar 2025 12:03:58 +0800
From: Hans Zhang <18255117159@....com>
To: lpieralisi@...nel.org
Cc: kw@...ux.com,
manivannan.sadhasivam@...aro.org,
robh@...nel.org,
bhelgaas@...gle.com,
jingoohan1@...il.com,
thomas.richard@...tlin.com,
linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org,
Hans Zhang <18255117159@....com>
Subject: [v3 4/4] PCI: cadence: Use cdns_pcie_find_*capability to find capability offset instead of hardcore
The offset address of capability or extended capability designed by
different SOC design companies may not be the same. Therefore, a flexible
public API is required to find the offset address of a capability or
extended capability in the configuration space.
Signed-off-by: Hans Zhang <18255117159@....com>
---
.../pci/controller/cadence/pcie-cadence-ep.c | 40 +++++++++++--------
drivers/pci/controller/cadence/pcie-cadence.h | 5 ---
2 files changed, 23 insertions(+), 22 deletions(-)
diff --git a/drivers/pci/controller/cadence/pcie-cadence-ep.c b/drivers/pci/controller/cadence/pcie-cadence-ep.c
index e0cc4560dfde..aea53ddcaf9b 100644
--- a/drivers/pci/controller/cadence/pcie-cadence-ep.c
+++ b/drivers/pci/controller/cadence/pcie-cadence-ep.c
@@ -19,12 +19,13 @@
static u8 cdns_pcie_get_fn_from_vfn(struct cdns_pcie *pcie, u8 fn, u8 vfn)
{
- u32 cap = CDNS_PCIE_EP_FUNC_SRIOV_CAP_OFFSET;
u32 first_vf_offset, stride;
+ u16 cap;
if (vfn == 0)
return fn;
+ cap = cdns_pcie_find_ext_capability(pcie, PCI_EXT_CAP_ID_SRIOV);
first_vf_offset = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_SRIOV_VF_OFFSET);
stride = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_SRIOV_VF_STRIDE);
fn = fn + first_vf_offset + ((vfn - 1) * stride);
@@ -36,10 +37,11 @@ static int cdns_pcie_ep_write_header(struct pci_epc *epc, u8 fn, u8 vfn,
struct pci_epf_header *hdr)
{
struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
- u32 cap = CDNS_PCIE_EP_FUNC_SRIOV_CAP_OFFSET;
struct cdns_pcie *pcie = &ep->pcie;
u32 reg;
+ u16 cap;
+ cap = cdns_pcie_find_ext_capability(pcie, PCI_EXT_CAP_ID_SRIOV);
if (vfn > 1) {
dev_err(&epc->dev, "Only Virtual Function #1 has deviceID\n");
return -EINVAL;
@@ -224,9 +226,10 @@ static int cdns_pcie_ep_set_msi(struct pci_epc *epc, u8 fn, u8 vfn, u8 mmc)
{
struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
struct cdns_pcie *pcie = &ep->pcie;
- u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
u16 flags;
+ u8 cap;
+ cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_MSI);
fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn);
/*
@@ -246,9 +249,10 @@ static int cdns_pcie_ep_get_msi(struct pci_epc *epc, u8 fn, u8 vfn)
{
struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
struct cdns_pcie *pcie = &ep->pcie;
- u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
u16 flags, mme;
+ u8 cap;
+ cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_MSI);
fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn);
/* Validate that the MSI feature is actually enabled. */
@@ -269,9 +273,10 @@ static int cdns_pcie_ep_get_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no)
{
struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
struct cdns_pcie *pcie = &ep->pcie;
- u32 cap = CDNS_PCIE_EP_FUNC_MSIX_CAP_OFFSET;
u32 val, reg;
+ u8 cap;
+ cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_MSIX);
func_no = cdns_pcie_get_fn_from_vfn(pcie, func_no, vfunc_no);
reg = cap + PCI_MSIX_FLAGS;
@@ -290,9 +295,10 @@ static int cdns_pcie_ep_set_msix(struct pci_epc *epc, u8 fn, u8 vfn,
{
struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
struct cdns_pcie *pcie = &ep->pcie;
- u32 cap = CDNS_PCIE_EP_FUNC_MSIX_CAP_OFFSET;
u32 val, reg;
+ u8 cap;
+ cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_MSIX);
fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn);
reg = cap + PCI_MSIX_FLAGS;
@@ -379,11 +385,11 @@ static int cdns_pcie_ep_send_msi_irq(struct cdns_pcie_ep *ep, u8 fn, u8 vfn,
u8 interrupt_num)
{
struct cdns_pcie *pcie = &ep->pcie;
- u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
u16 flags, mme, data, data_mask;
- u8 msi_count;
u64 pci_addr, pci_addr_mask = 0xff;
+ u8 msi_count, cap;
+ cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_MSI);
fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn);
/* Check whether the MSI feature has been enabled by the PCI host. */
@@ -431,14 +437,14 @@ static int cdns_pcie_ep_map_msi_irq(struct pci_epc *epc, u8 fn, u8 vfn,
u32 *msi_addr_offset)
{
struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
- u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
struct cdns_pcie *pcie = &ep->pcie;
u64 pci_addr, pci_addr_mask = 0xff;
u16 flags, mme, data, data_mask;
- u8 msi_count;
+ u8 msi_count, cap;
int ret;
int i;
+ cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_MSI);
fn = cdns_pcie_get_fn_from_vfn(pcie, fn, vfn);
/* Check whether the MSI feature has been enabled by the PCI host. */
@@ -481,16 +487,16 @@ static int cdns_pcie_ep_map_msi_irq(struct pci_epc *epc, u8 fn, u8 vfn,
static int cdns_pcie_ep_send_msix_irq(struct cdns_pcie_ep *ep, u8 fn, u8 vfn,
u16 interrupt_num)
{
- u32 cap = CDNS_PCIE_EP_FUNC_MSIX_CAP_OFFSET;
u32 tbl_offset, msg_data, reg;
struct cdns_pcie *pcie = &ep->pcie;
struct pci_epf_msix_tbl *msix_tbl;
struct cdns_pcie_epf *epf;
u64 pci_addr_mask = 0xff;
u64 msg_addr;
+ u8 bir, cap;
u16 flags;
- u8 bir;
+ cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_MSIX);
epf = &ep->epf[fn];
if (vfn > 0)
epf = &epf->epf[vfn - 1];
@@ -564,7 +570,9 @@ static int cdns_pcie_ep_start(struct pci_epc *epc)
int max_epfs = sizeof(epc->function_num_map) * 8;
int ret, epf, last_fn;
u32 reg, value;
+ u8 cap;
+ cap = cdns_pcie_find_capability(pcie, PCI_CAP_ID_EXP);
/*
* BIT(0) is hardwired to 1, hence function 0 is always enabled
* and can't be disabled anyway.
@@ -588,12 +596,10 @@ static int cdns_pcie_ep_start(struct pci_epc *epc)
continue;
value = cdns_pcie_ep_fn_readl(pcie, epf,
- CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET +
- PCI_EXP_DEVCAP);
+ cap + PCI_EXP_DEVCAP);
value &= ~PCI_EXP_DEVCAP_FLR;
- cdns_pcie_ep_fn_writel(pcie, epf,
- CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET +
- PCI_EXP_DEVCAP, value);
+ cdns_pcie_ep_fn_writel(pcie, epf, cap + PCI_EXP_DEVCAP,
+ value);
}
}
diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
index 6f4981fccb94..d0fcf1b3549c 100644
--- a/drivers/pci/controller/cadence/pcie-cadence.h
+++ b/drivers/pci/controller/cadence/pcie-cadence.h
@@ -125,11 +125,6 @@
*/
#define CDNS_PCIE_EP_FUNC_BASE(fn) (((fn) << 12) & GENMASK(19, 12))
-#define CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET 0x90
-#define CDNS_PCIE_EP_FUNC_MSIX_CAP_OFFSET 0xb0
-#define CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET 0xc0
-#define CDNS_PCIE_EP_FUNC_SRIOV_CAP_OFFSET 0x200
-
/*
* Endpoint PF Registers
*/
--
2.25.1
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