PCI: endpoint: Add helper to get first unreserved BAR
Add a helper function pci_epc_get_first_free_bar() to get the first unreserved BAR that can be used for endpoint function. Tested-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
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@ -83,6 +83,29 @@ err:
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}
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EXPORT_SYMBOL_GPL(pci_epc_get);
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EXPORT_SYMBOL_GPL(pci_epc_get);
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/**
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* pci_epc_get_first_free_bar() - helper to get first unreserved BAR
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* @epc_features: pci_epc_features structure that holds the reserved bar bitmap
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*
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* Invoke to get the first unreserved BAR that can be used for endpoint
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* function. For any incorrect value in reserved_bar return '0'.
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*/
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unsigned int pci_epc_get_first_free_bar(const struct pci_epc_features
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*epc_features)
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{
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int free_bar;
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if (!epc_features)
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return 0;
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free_bar = ffz(epc_features->reserved_bar);
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if (free_bar > 5)
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return 0;
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return free_bar;
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}
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EXPORT_SYMBOL_GPL(pci_epc_get_first_free_bar);
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/**
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/**
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* pci_epc_get_features() - get the features supported by EPC
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* pci_epc_get_features() - get the features supported by EPC
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* @epc: the features supported by *this* EPC device will be returned
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* @epc: the features supported by *this* EPC device will be returned
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@ -180,6 +180,8 @@ int pci_epc_start(struct pci_epc *epc);
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void pci_epc_stop(struct pci_epc *epc);
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void pci_epc_stop(struct pci_epc *epc);
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const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
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const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
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u8 func_no);
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u8 func_no);
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unsigned int pci_epc_get_first_free_bar(const struct pci_epc_features
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*epc_features);
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struct pci_epc *pci_epc_get(const char *epc_name);
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struct pci_epc *pci_epc_get(const char *epc_name);
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void pci_epc_put(struct pci_epc *epc);
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void pci_epc_put(struct pci_epc *epc);
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