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include/linux/pci-epc.h
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/** * PCI Endpoint *Controller* (EPC) header file * * Copyright (C) 2017 Texas Instruments * Author: Kishon Vijay Abraham I <kishon@ti.com> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 of * the License as published by the Free Software Foundation. */ #ifndef __LINUX_PCI_EPC_H #define __LINUX_PCI_EPC_H #include <linux/pci-epf.h> struct pci_epc; enum pci_epc_irq_type { PCI_EPC_IRQ_UNKNOWN, PCI_EPC_IRQ_LEGACY, PCI_EPC_IRQ_MSI, }; /** * struct pci_epc_ops - set of function pointers for performing EPC operations * @write_header: ops to populate configuration space header * @set_bar: ops to configure the BAR * @clear_bar: ops to reset the BAR * @map_addr: ops to map CPU address to PCI address * @unmap_addr: ops to unmap CPU address and PCI address * @set_msi: ops to set the requested number of MSI interrupts in the MSI * capability register * @get_msi: ops to get the number of MSI interrupts allocated by the RC from * the MSI capability register * @raise_irq: ops to raise a legacy or MSI interrupt * @start: ops to start the PCI link * @stop: ops to stop the PCI link * @owner: the module owner containing the ops */ struct pci_epc_ops { int (*write_header)(struct pci_epc *pci_epc, struct pci_epf_header *hdr); int (*set_bar)(struct pci_epc *epc, enum pci_barno bar, dma_addr_t bar_phys, size_t size, int flags); void (*clear_bar)(struct pci_epc *epc, enum pci_barno bar); int (*map_addr)(struct pci_epc *epc, phys_addr_t addr, u64 pci_addr, size_t size); void (*unmap_addr)(struct pci_epc *epc, phys_addr_t addr); int (*set_msi)(struct pci_epc *epc, u8 interrupts); int (*get_msi)(struct pci_epc *epc); int (*raise_irq)(struct pci_epc *pci_epc, enum pci_epc_irq_type type, u8 interrupt_num); int (*start)(struct pci_epc *epc); void (*stop)(struct pci_epc *epc); struct module *owner; }; /** * struct pci_epc_mem - address space of the endpoint controller * @phys_base: physical base address of the PCI address space * @size: the size of the PCI address space * @bitmap: bitmap to manage the PCI address space * @pages: number of bits representing the address region |
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* @page_size: size of each page |
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*/ struct pci_epc_mem { phys_addr_t phys_base; size_t size; unsigned long *bitmap; |
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size_t page_size; |
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int pages; }; /** * struct pci_epc - represents the PCI EPC device * @dev: PCI EPC device * @pci_epf: list of endpoint functions present in this EPC device * @ops: function pointers for performing endpoint operations * @mem: address space of the endpoint controller * @max_functions: max number of functions that can be configured in this EPC |
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* @group: configfs group representing the PCI EPC device |
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* @lock: spinlock to protect pci_epc ops */ struct pci_epc { struct device dev; struct list_head pci_epf; const struct pci_epc_ops *ops; struct pci_epc_mem *mem; u8 max_functions; |
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struct config_group *group; |
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/* spinlock to protect against concurrent access of EP controller */ spinlock_t lock; }; #define to_pci_epc(device) container_of((device), struct pci_epc, dev) #define pci_epc_create(dev, ops) \ __pci_epc_create((dev), (ops), THIS_MODULE) #define devm_pci_epc_create(dev, ops) \ __devm_pci_epc_create((dev), (ops), THIS_MODULE) |
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#define pci_epc_mem_init(epc, phys_addr, size) \ __pci_epc_mem_init((epc), (phys_addr), (size), PAGE_SIZE) |
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static inline void epc_set_drvdata(struct pci_epc *epc, void *data) { dev_set_drvdata(&epc->dev, data); } static inline void *epc_get_drvdata(struct pci_epc *epc) { return dev_get_drvdata(&epc->dev); } struct pci_epc * __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops, struct module *owner); struct pci_epc * __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops, struct module *owner); void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc); void pci_epc_destroy(struct pci_epc *epc); int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf); void pci_epc_linkup(struct pci_epc *epc); void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf); int pci_epc_write_header(struct pci_epc *epc, struct pci_epf_header *hdr); int pci_epc_set_bar(struct pci_epc *epc, enum pci_barno bar, dma_addr_t bar_phys, size_t size, int flags); void pci_epc_clear_bar(struct pci_epc *epc, int bar); int pci_epc_map_addr(struct pci_epc *epc, phys_addr_t phys_addr, u64 pci_addr, size_t size); void pci_epc_unmap_addr(struct pci_epc *epc, phys_addr_t phys_addr); int pci_epc_set_msi(struct pci_epc *epc, u8 interrupts); int pci_epc_get_msi(struct pci_epc *epc); int pci_epc_raise_irq(struct pci_epc *epc, enum pci_epc_irq_type type, u8 interrupt_num); int pci_epc_start(struct pci_epc *epc); void pci_epc_stop(struct pci_epc *epc); struct pci_epc *pci_epc_get(const char *epc_name); void pci_epc_put(struct pci_epc *epc); |
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int __pci_epc_mem_init(struct pci_epc *epc, phys_addr_t phys_addr, size_t size, size_t page_size); |
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void pci_epc_mem_exit(struct pci_epc *epc); void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc, phys_addr_t *phys_addr, size_t size); void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr, void __iomem *virt_addr, size_t size); #endif /* __LINUX_PCI_EPC_H */ |