include/linux/pci-epc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /**
   3  * PCI Endpoint *Controller* (EPC) header file
   4  *
   5  * Copyright (C) 2017 Texas Instruments
   6  * Author: Kishon Vijay Abraham I <kishon@ti.com>
   7  */
   8
   9 #ifndef __LINUX_PCI_EPC_H
  10 #define __LINUX_PCI_EPC_H
  11
  12 #include <linux/pci-epf.h>
  13
  14 struct pci_epc;
  15
  16 enum pci_epc_irq_type {
  17         PCI_EPC_IRQ_UNKNOWN,
  18         PCI_EPC_IRQ_LEGACY,
  19         PCI_EPC_IRQ_MSI,
  20 };
  21
  22 /**
  23  * struct pci_epc_ops - set of function pointers for performing EPC operations
  24  * @write_header: ops to populate configuration space header
  25  * @set_bar: ops to configure the BAR
  26  * @clear_bar: ops to reset the BAR
  27  * @map_addr: ops to map CPU address to PCI address
  28  * @unmap_addr: ops to unmap CPU address and PCI address
  29  * @set_msi: ops to set the requested number of MSI interrupts in the MSI
  30  *           capability register
  31  * @get_msi: ops to get the number of MSI interrupts allocated by the RC from
  32  *           the MSI capability register
  33  * @raise_irq: ops to raise a legacy or MSI interrupt
  34  * @start: ops to start the PCI link
  35  * @stop: ops to stop the PCI link
  36  * @owner: the module owner containing the ops
  37  */
  38 struct pci_epc_ops {
  39         int     (*write_header)(struct pci_epc *epc, u8 func_no,
  40                                 struct pci_epf_header *hdr);
  41         int     (*set_bar)(struct pci_epc *epc, u8 func_no,
  42                            enum pci_barno bar,
  43                            dma_addr_t bar_phys, size_t size, int flags);
  44         void    (*clear_bar)(struct pci_epc *epc, u8 func_no,
  45                              enum pci_barno bar);
  46         int     (*map_addr)(struct pci_epc *epc, u8 func_no,
  47                             phys_addr_t addr, u64 pci_addr, size_t size);
  48         void    (*unmap_addr)(struct pci_epc *epc, u8 func_no,
  49                               phys_addr_t addr);
  50         int     (*set_msi)(struct pci_epc *epc, u8 func_no, u8 interrupts);
  51         int     (*get_msi)(struct pci_epc *epc, u8 func_no);
  52         int     (*raise_irq)(struct pci_epc *epc, u8 func_no,
  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  * @page_size: size of each page
  66  */
  67 struct pci_epc_mem {
  68         phys_addr_t     phys_base;
  69         size_t          size;
  70         unsigned long   *bitmap;
  71         size_t          page_size;
  72         int             pages;
  73 };
  74
  75 /**
  76  * struct pci_epc - represents the PCI EPC device
  77  * @dev: PCI EPC device
  78  * @pci_epf: list of endpoint functions present in this EPC device
  79  * @ops: function pointers for performing endpoint operations
  80  * @mem: address space of the endpoint controller
  81  * @max_functions: max number of functions that can be configured in this EPC
  82  * @group: configfs group representing the PCI EPC device
  83  * @lock: spinlock to protect pci_epc ops
  84  */
  85 struct pci_epc {
  86         struct device                   dev;
  87         struct list_head                pci_epf;
  88         const struct pci_epc_ops        *ops;
  89         struct pci_epc_mem              *mem;
  90         u8                              max_functions;
  91         struct config_group             *group;
  92         /* spinlock to protect against concurrent access of EP controller */
  93         spinlock_t                      lock;
  94 };
  95
  96 #define to_pci_epc(device) container_of((device), struct pci_epc, dev)
  97
  98 #define pci_epc_create(dev, ops)    \
  99                 __pci_epc_create((dev), (ops), THIS_MODULE)
 100 #define devm_pci_epc_create(dev, ops)    \
 101                 __devm_pci_epc_create((dev), (ops), THIS_MODULE)
 102
 103 #define pci_epc_mem_init(epc, phys_addr, size)  \
 104                 __pci_epc_mem_init((epc), (phys_addr), (size), PAGE_SIZE)
 105
 106 static inline void epc_set_drvdata(struct pci_epc *epc, void *data)
 107 {
 108         dev_set_drvdata(&epc->dev, data);
 109 }
 110
 111 static inline void *epc_get_drvdata(struct pci_epc *epc)
 112 {
 113         return dev_get_drvdata(&epc->dev);
 114 }
 115
 116 struct pci_epc *
 117 __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
 118                       struct module *owner);
 119 struct pci_epc *
 120 __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
 121                  struct module *owner);
 122 void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc);
 123 void pci_epc_destroy(struct pci_epc *epc);
 124 int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf);
 125 void pci_epc_linkup(struct pci_epc *epc);
 126 void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf);
 127 int pci_epc_write_header(struct pci_epc *epc, u8 func_no,
 128                          struct pci_epf_header *hdr);
 129 int pci_epc_set_bar(struct pci_epc *epc, u8 func_no,
 130                     enum pci_barno bar,
 131                     dma_addr_t bar_phys, size_t size, int flags);
 132 void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, int bar);
 133 int pci_epc_map_addr(struct pci_epc *epc, u8 func_no,
 134                      phys_addr_t phys_addr,
 135                      u64 pci_addr, size_t size);
 136 void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no,
 137                         phys_addr_t phys_addr);
 138 int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts);
 139 int pci_epc_get_msi(struct pci_epc *epc, u8 func_no);
 140 int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
 141                       enum pci_epc_irq_type type, u8 interrupt_num);
 142 int pci_epc_start(struct pci_epc *epc);
 143 void pci_epc_stop(struct pci_epc *epc);
 144 struct pci_epc *pci_epc_get(const char *epc_name);
 145 void pci_epc_put(struct pci_epc *epc);
 146
 147 int __pci_epc_mem_init(struct pci_epc *epc, phys_addr_t phys_addr, size_t size,
 148                        size_t page_size);
 149 void pci_epc_mem_exit(struct pci_epc *epc);
 150 void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
 151                                      phys_addr_t *phys_addr, size_t size);
 152 void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
 153                            void __iomem *virt_addr, size_t size);
 154 #endif /* __LINUX_PCI_EPC_H */