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         PCI_EPC_IRQ_MSIX,
  21 };
  22
  23 /**
  24  * struct pci_epc_ops - set of function pointers for performing EPC operations
  25  * @write_header: ops to populate configuration space header
  26  * @set_bar: ops to configure the BAR
  27  * @clear_bar: ops to reset the BAR
  28  * @map_addr: ops to map CPU address to PCI address
  29  * @unmap_addr: ops to unmap CPU address and PCI address
  30  * @set_msi: ops to set the requested number of MSI interrupts in the MSI
  31  *           capability register
  32  * @get_msi: ops to get the number of MSI interrupts allocated by the RC from
  33  *           the MSI capability register
  34  * @set_msix: ops to set the requested number of MSI-X interrupts in the
  35  *           MSI-X capability register
  36  * @get_msix: ops to get the number of MSI-X interrupts allocated by the RC
  37  *           from the MSI-X capability register
  38  * @raise_irq: ops to raise a legacy, MSI or MSI-X interrupt
  39  * @start: ops to start the PCI link
  40  * @stop: ops to stop the PCI link
  41  * @owner: the module owner containing the ops
  42  */
  43 struct pci_epc_ops {
  44         int     (*write_header)(struct pci_epc *epc, u8 func_no,
  45                                 struct pci_epf_header *hdr);
  46         int     (*set_bar)(struct pci_epc *epc, u8 func_no,
  47                            struct pci_epf_bar *epf_bar);
  48         void    (*clear_bar)(struct pci_epc *epc, u8 func_no,
  49                              struct pci_epf_bar *epf_bar);
  50         int     (*map_addr)(struct pci_epc *epc, u8 func_no,
  51                             phys_addr_t addr, u64 pci_addr, size_t size);
  52         void    (*unmap_addr)(struct pci_epc *epc, u8 func_no,
  53                               phys_addr_t addr);
  54         int     (*set_msi)(struct pci_epc *epc, u8 func_no, u8 interrupts);
  55         int     (*get_msi)(struct pci_epc *epc, u8 func_no);
  56         int     (*set_msix)(struct pci_epc *epc, u8 func_no, u16 interrupts);
  57         int     (*get_msix)(struct pci_epc *epc, u8 func_no);
  58         int     (*raise_irq)(struct pci_epc *epc, u8 func_no,
  59                              enum pci_epc_irq_type type, u16 interrupt_num);
  60         int     (*start)(struct pci_epc *epc);
  61         void    (*stop)(struct pci_epc *epc);
  62         struct module *owner;
  63 };
  64
  65 /**
  66  * struct pci_epc_mem - address space of the endpoint controller
  67  * @phys_base: physical base address of the PCI address space
  68  * @size: the size of the PCI address space
  69  * @bitmap: bitmap to manage the PCI address space
  70  * @pages: number of bits representing the address region
  71  * @page_size: size of each page
  72  */
  73 struct pci_epc_mem {
  74         phys_addr_t     phys_base;
  75         size_t          size;
  76         unsigned long   *bitmap;
  77         size_t          page_size;
  78         int             pages;
  79 };
  80
  81 /**
  82  * struct pci_epc - represents the PCI EPC device
  83  * @dev: PCI EPC device
  84  * @pci_epf: list of endpoint functions present in this EPC device
  85  * @ops: function pointers for performing endpoint operations
  86  * @mem: address space of the endpoint controller
  87  * @max_functions: max number of functions that can be configured in this EPC
  88  * @group: configfs group representing the PCI EPC device
  89  * @lock: spinlock to protect pci_epc ops
  90  */
  91 struct pci_epc {
  92         struct device                   dev;
  93         struct list_head                pci_epf;
  94         const struct pci_epc_ops        *ops;
  95         struct pci_epc_mem              *mem;
  96         u8                              max_functions;
  97         struct config_group             *group;
  98         /* spinlock to protect against concurrent access of EP controller */
  99         spinlock_t                      lock;
 100         unsigned int                    features;
 101 };
 102
 103 #define EPC_FEATURE_NO_LINKUP_NOTIFIER          BIT(0)
 104 #define EPC_FEATURE_BAR_MASK                    (BIT(1) | BIT(2) | BIT(3))
 105 #define EPC_FEATURE_MSIX_AVAILABLE              BIT(4)
 106 #define EPC_FEATURE_SET_BAR(features, bar)      \
 107                 (features |= (EPC_FEATURE_BAR_MASK & (bar << 1)))
 108 #define EPC_FEATURE_GET_BAR(features)           \
 109                 ((features & EPC_FEATURE_BAR_MASK) >> 1)
 110
 111 #define to_pci_epc(device) container_of((device), struct pci_epc, dev)
 112
 113 #define pci_epc_create(dev, ops)    \
 114                 __pci_epc_create((dev), (ops), THIS_MODULE)
 115 #define devm_pci_epc_create(dev, ops)    \
 116                 __devm_pci_epc_create((dev), (ops), THIS_MODULE)
 117
 118 #define pci_epc_mem_init(epc, phys_addr, size)  \
 119                 __pci_epc_mem_init((epc), (phys_addr), (size), PAGE_SIZE)
 120
 121 static inline void epc_set_drvdata(struct pci_epc *epc, void *data)
 122 {
 123         dev_set_drvdata(&epc->dev, data);
 124 }
 125
 126 static inline void *epc_get_drvdata(struct pci_epc *epc)
 127 {
 128         return dev_get_drvdata(&epc->dev);
 129 }
 130
 131 struct pci_epc *
 132 __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
 133                       struct module *owner);
 134 struct pci_epc *
 135 __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
 136                  struct module *owner);
 137 void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc);
 138 void pci_epc_destroy(struct pci_epc *epc);
 139 int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf);
 140 void pci_epc_linkup(struct pci_epc *epc);
 141 void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf);
 142 int pci_epc_write_header(struct pci_epc *epc, u8 func_no,
 143                          struct pci_epf_header *hdr);
 144 int pci_epc_set_bar(struct pci_epc *epc, u8 func_no,
 145                     struct pci_epf_bar *epf_bar);
 146 void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no,
 147                        struct pci_epf_bar *epf_bar);
 148 int pci_epc_map_addr(struct pci_epc *epc, u8 func_no,
 149                      phys_addr_t phys_addr,
 150                      u64 pci_addr, size_t size);
 151 void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no,
 152                         phys_addr_t phys_addr);
 153 int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts);
 154 int pci_epc_get_msi(struct pci_epc *epc, u8 func_no);
 155 int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts);
 156 int pci_epc_get_msix(struct pci_epc *epc, u8 func_no);
 157 int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
 158                       enum pci_epc_irq_type type, u16 interrupt_num);
 159 int pci_epc_start(struct pci_epc *epc);
 160 void pci_epc_stop(struct pci_epc *epc);
 161 struct pci_epc *pci_epc_get(const char *epc_name);
 162 void pci_epc_put(struct pci_epc *epc);
 163
 164 int __pci_epc_mem_init(struct pci_epc *epc, phys_addr_t phys_addr, size_t size,
 165                        size_t page_size);
 166 void pci_epc_mem_exit(struct pci_epc *epc);
 167 void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
 168                                      phys_addr_t *phys_addr, size_t size);
 169 void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
 170                            void __iomem *virt_addr, size_t size);
 171 #endif /* __LINUX_PCI_EPC_H */