include/linux/pci-epc.h

   1 /**
   2  * PCI Endpoint *Controller* (EPC) header file
   3  *
   4  * Copyright (C) 2017 Texas Instruments
   5  * Author: Kishon Vijay Abraham I <kishon@ti.com>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 of
   9  * the License as published by the Free Software Foundation.
  10  */
  11
  12 #ifndef __LINUX_PCI_EPC_H
  13 #define __LINUX_PCI_EPC_H
  14
  15 #include <linux/pci-epf.h>
  16
  17 struct pci_epc;
  18
  19 enum pci_epc_irq_type {
  20         PCI_EPC_IRQ_UNKNOWN,
  21         PCI_EPC_IRQ_LEGACY,
  22         PCI_EPC_IRQ_MSI,
  23 };
  24
  25 /**
  26  * struct pci_epc_ops - set of function pointers for performing EPC operations
  27  * @write_header: ops to populate configuration space header
  28  * @set_bar: ops to configure the BAR
  29  * @clear_bar: ops to reset the BAR
  30  * @map_addr: ops to map CPU address to PCI address
  31  * @unmap_addr: ops to unmap CPU address and PCI address
  32  * @set_msi: ops to set the requested number of MSI interrupts in the MSI
  33  *           capability register
  34  * @get_msi: ops to get the number of MSI interrupts allocated by the RC from
  35  *           the MSI capability register
  36  * @raise_irq: ops to raise a legacy or MSI interrupt
  37  * @start: ops to start the PCI link
  38  * @stop: ops to stop the PCI link
  39  * @owner: the module owner containing the ops
  40  */
  41 struct pci_epc_ops {
  42         int     (*write_header)(struct pci_epc *pci_epc,
  43                                 struct pci_epf_header *hdr);
  44         int     (*set_bar)(struct pci_epc *epc, enum pci_barno bar,
  45                            dma_addr_t bar_phys, size_t size, int flags);
  46         void    (*clear_bar)(struct pci_epc *epc, enum pci_barno bar);
  47         int     (*map_addr)(struct pci_epc *epc, phys_addr_t addr,
  48                             u64 pci_addr, size_t size);
  49         void    (*unmap_addr)(struct pci_epc *epc, phys_addr_t addr);
  50         int     (*set_msi)(struct pci_epc *epc, u8 interrupts);
  51         int     (*get_msi)(struct pci_epc *epc);
  52         int     (*raise_irq)(struct pci_epc *pci_epc,
  53                              enum pci_epc_irq_type type, u8 interrupt_num);
  54         int     (*start)(struct pci_epc *epc);
  55         void    (*stop)(struct pci_epc *epc);
  56         struct module *owner;
  57 };
  58
  59 /**
  60  * struct pci_epc_mem - address space of the endpoint controller
  61  * @phys_base: physical base address of the PCI address space
  62  * @size: the size of the PCI address space
  63  * @bitmap: bitmap to manage the PCI address space
  64  * @pages: number of bits representing the address region
  65  */
  66 struct pci_epc_mem {
  67         phys_addr_t     phys_base;
  68         size_t          size;
  69         unsigned long   *bitmap;
  70         int             pages;
  71 };
  72
  73 /**
  74  * struct pci_epc - represents the PCI EPC device
  75  * @dev: PCI EPC device
  76  * @pci_epf: list of endpoint functions present in this EPC device
  77  * @ops: function pointers for performing endpoint operations
  78  * @mem: address space of the endpoint controller
  79  * @max_functions: max number of functions that can be configured in this EPC
  80  * @group: configfs group representing the PCI EPC device
  81  * @lock: spinlock to protect pci_epc ops
  82  */
  83 struct pci_epc {
  84         struct device                   dev;
  85         struct list_head                pci_epf;
  86         const struct pci_epc_ops        *ops;
  87         struct pci_epc_mem              *mem;
  88         u8                              max_functions;
  89         struct config_group             *group;
  90         /* spinlock to protect against concurrent access of EP controller */
  91         spinlock_t                      lock;
  92 };
  93
  94 #define to_pci_epc(device) container_of((device), struct pci_epc, dev)
  95
  96 #define pci_epc_create(dev, ops)    \
  97                 __pci_epc_create((dev), (ops), THIS_MODULE)
  98 #define devm_pci_epc_create(dev, ops)    \
  99                 __devm_pci_epc_create((dev), (ops), THIS_MODULE)
 100
 101 static inline void epc_set_drvdata(struct pci_epc *epc, void *data)
 102 {
 103         dev_set_drvdata(&epc->dev, data);
 104 }
 105
 106 static inline void *epc_get_drvdata(struct pci_epc *epc)
 107 {
 108         return dev_get_drvdata(&epc->dev);
 109 }
 110
 111 struct pci_epc *
 112 __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
 113                       struct module *owner);
 114 struct pci_epc *
 115 __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
 116                  struct module *owner);
 117 void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc);
 118 void pci_epc_destroy(struct pci_epc *epc);
 119 int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf);
 120 void pci_epc_linkup(struct pci_epc *epc);
 121 void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf);
 122 int pci_epc_write_header(struct pci_epc *epc, struct pci_epf_header *hdr);
 123 int pci_epc_set_bar(struct pci_epc *epc, enum pci_barno bar,
 124                     dma_addr_t bar_phys, size_t size, int flags);
 125 void pci_epc_clear_bar(struct pci_epc *epc, int bar);
 126 int pci_epc_map_addr(struct pci_epc *epc, phys_addr_t phys_addr,
 127                      u64 pci_addr, size_t size);
 128 void pci_epc_unmap_addr(struct pci_epc *epc, phys_addr_t phys_addr);
 129 int pci_epc_set_msi(struct pci_epc *epc, u8 interrupts);
 130 int pci_epc_get_msi(struct pci_epc *epc);
 131 int pci_epc_raise_irq(struct pci_epc *epc, enum pci_epc_irq_type type,
 132                       u8 interrupt_num);
 133 int pci_epc_start(struct pci_epc *epc);
 134 void pci_epc_stop(struct pci_epc *epc);
 135 struct pci_epc *pci_epc_get(const char *epc_name);
 136 void pci_epc_put(struct pci_epc *epc);
 137
 138 int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t phys_addr, size_t size);
 139 void pci_epc_mem_exit(struct pci_epc *epc);
 140 void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
 141                                      phys_addr_t *phys_addr, size_t size);
 142 void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
 143                            void __iomem *virt_addr, size_t size);
 144 #endif /* __LINUX_PCI_EPC_H */