pci-epc.h (9698B)
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 14struct pci_epc; 15 16enum pci_epc_interface_type { 17 UNKNOWN_INTERFACE = -1, 18 PRIMARY_INTERFACE, 19 SECONDARY_INTERFACE, 20}; 21 22enum pci_epc_irq_type { 23 PCI_EPC_IRQ_UNKNOWN, 24 PCI_EPC_IRQ_LEGACY, 25 PCI_EPC_IRQ_MSI, 26 PCI_EPC_IRQ_MSIX, 27}; 28 29static inline const char * 30pci_epc_interface_string(enum pci_epc_interface_type type) 31{ 32 switch (type) { 33 case PRIMARY_INTERFACE: 34 return "primary"; 35 case SECONDARY_INTERFACE: 36 return "secondary"; 37 default: 38 return "UNKNOWN interface"; 39 } 40} 41 42/** 43 * struct pci_epc_ops - set of function pointers for performing EPC operations 44 * @write_header: ops to populate configuration space header 45 * @set_bar: ops to configure the BAR 46 * @clear_bar: ops to reset the BAR 47 * @map_addr: ops to map CPU address to PCI address 48 * @unmap_addr: ops to unmap CPU address and PCI address 49 * @set_msi: ops to set the requested number of MSI interrupts in the MSI 50 * capability register 51 * @get_msi: ops to get the number of MSI interrupts allocated by the RC from 52 * the MSI capability register 53 * @set_msix: ops to set the requested number of MSI-X interrupts in the 54 * MSI-X capability register 55 * @get_msix: ops to get the number of MSI-X interrupts allocated by the RC 56 * from the MSI-X capability register 57 * @raise_irq: ops to raise a legacy, MSI or MSI-X interrupt 58 * @map_msi_irq: ops to map physical address to MSI address and return MSI data 59 * @start: ops to start the PCI link 60 * @stop: ops to stop the PCI link 61 * @get_features: ops to get the features supported by the EPC 62 * @owner: the module owner containing the ops 63 */ 64struct pci_epc_ops { 65 int (*write_header)(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 66 struct pci_epf_header *hdr); 67 int (*set_bar)(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 68 struct pci_epf_bar *epf_bar); 69 void (*clear_bar)(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 70 struct pci_epf_bar *epf_bar); 71 int (*map_addr)(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 72 phys_addr_t addr, u64 pci_addr, size_t size); 73 void (*unmap_addr)(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 74 phys_addr_t addr); 75 int (*set_msi)(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 76 u8 interrupts); 77 int (*get_msi)(struct pci_epc *epc, u8 func_no, u8 vfunc_no); 78 int (*set_msix)(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 79 u16 interrupts, enum pci_barno, u32 offset); 80 int (*get_msix)(struct pci_epc *epc, u8 func_no, u8 vfunc_no); 81 int (*raise_irq)(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 82 enum pci_epc_irq_type type, u16 interrupt_num); 83 int (*map_msi_irq)(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 84 phys_addr_t phys_addr, u8 interrupt_num, 85 u32 entry_size, u32 *msi_data, 86 u32 *msi_addr_offset); 87 int (*start)(struct pci_epc *epc); 88 void (*stop)(struct pci_epc *epc); 89 const struct pci_epc_features* (*get_features)(struct pci_epc *epc, 90 u8 func_no, u8 vfunc_no); 91 struct module *owner; 92}; 93 94/** 95 * struct pci_epc_mem_window - address window of the endpoint controller 96 * @phys_base: physical base address of the PCI address window 97 * @size: the size of the PCI address window 98 * @page_size: size of each page 99 */ 100struct pci_epc_mem_window { 101 phys_addr_t phys_base; 102 size_t size; 103 size_t page_size; 104}; 105 106/** 107 * struct pci_epc_mem - address space of the endpoint controller 108 * @window: address window of the endpoint controller 109 * @bitmap: bitmap to manage the PCI address space 110 * @pages: number of bits representing the address region 111 * @lock: mutex to protect bitmap 112 */ 113struct pci_epc_mem { 114 struct pci_epc_mem_window window; 115 unsigned long *bitmap; 116 int pages; 117 /* mutex to protect against concurrent access for memory allocation*/ 118 struct mutex lock; 119}; 120 121/** 122 * struct pci_epc - represents the PCI EPC device 123 * @dev: PCI EPC device 124 * @pci_epf: list of endpoint functions present in this EPC device 125 * @ops: function pointers for performing endpoint operations 126 * @windows: array of address space of the endpoint controller 127 * @mem: first window of the endpoint controller, which corresponds to 128 * default address space of the endpoint controller supporting 129 * single window. 130 * @num_windows: number of windows supported by device 131 * @max_functions: max number of functions that can be configured in this EPC 132 * @max_vfs: Array indicating the maximum number of virtual functions that can 133 * be associated with each physical function 134 * @group: configfs group representing the PCI EPC device 135 * @lock: mutex to protect pci_epc ops 136 * @function_num_map: bitmap to manage physical function number 137 * @notifier: used to notify EPF of any EPC events (like linkup) 138 */ 139struct pci_epc { 140 struct device dev; 141 struct list_head pci_epf; 142 const struct pci_epc_ops *ops; 143 struct pci_epc_mem **windows; 144 struct pci_epc_mem *mem; 145 unsigned int num_windows; 146 u8 max_functions; 147 u8 *max_vfs; 148 struct config_group *group; 149 /* mutex to protect against concurrent access of EP controller */ 150 struct mutex lock; 151 unsigned long function_num_map; 152 struct atomic_notifier_head notifier; 153}; 154 155/** 156 * struct pci_epc_features - features supported by a EPC device per function 157 * @linkup_notifier: indicate if the EPC device can notify EPF driver on link up 158 * @core_init_notifier: indicate cores that can notify about their availability 159 * for initialization 160 * @msi_capable: indicate if the endpoint function has MSI capability 161 * @msix_capable: indicate if the endpoint function has MSI-X capability 162 * @reserved_bar: bitmap to indicate reserved BAR unavailable to function driver 163 * @bar_fixed_64bit: bitmap to indicate fixed 64bit BARs 164 * @bar_fixed_size: Array specifying the size supported by each BAR 165 * @align: alignment size required for BAR buffer allocation 166 */ 167struct pci_epc_features { 168 unsigned int linkup_notifier : 1; 169 unsigned int core_init_notifier : 1; 170 unsigned int msi_capable : 1; 171 unsigned int msix_capable : 1; 172 u8 reserved_bar; 173 u8 bar_fixed_64bit; 174 u64 bar_fixed_size[PCI_STD_NUM_BARS]; 175 size_t align; 176}; 177 178#define to_pci_epc(device) container_of((device), struct pci_epc, dev) 179 180#define pci_epc_create(dev, ops) \ 181 __pci_epc_create((dev), (ops), THIS_MODULE) 182#define devm_pci_epc_create(dev, ops) \ 183 __devm_pci_epc_create((dev), (ops), THIS_MODULE) 184 185static inline void epc_set_drvdata(struct pci_epc *epc, void *data) 186{ 187 dev_set_drvdata(&epc->dev, data); 188} 189 190static inline void *epc_get_drvdata(struct pci_epc *epc) 191{ 192 return dev_get_drvdata(&epc->dev); 193} 194 195static inline int 196pci_epc_register_notifier(struct pci_epc *epc, struct notifier_block *nb) 197{ 198 return atomic_notifier_chain_register(&epc->notifier, nb); 199} 200 201struct pci_epc * 202__devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops, 203 struct module *owner); 204struct pci_epc * 205__pci_epc_create(struct device *dev, const struct pci_epc_ops *ops, 206 struct module *owner); 207void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc); 208void pci_epc_destroy(struct pci_epc *epc); 209int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf, 210 enum pci_epc_interface_type type); 211void pci_epc_linkup(struct pci_epc *epc); 212void pci_epc_init_notify(struct pci_epc *epc); 213void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf, 214 enum pci_epc_interface_type type); 215int pci_epc_write_header(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 216 struct pci_epf_header *hdr); 217int pci_epc_set_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 218 struct pci_epf_bar *epf_bar); 219void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 220 struct pci_epf_bar *epf_bar); 221int pci_epc_map_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 222 phys_addr_t phys_addr, 223 u64 pci_addr, size_t size); 224void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 225 phys_addr_t phys_addr); 226int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 227 u8 interrupts); 228int pci_epc_get_msi(struct pci_epc *epc, u8 func_no, u8 vfunc_no); 229int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 230 u16 interrupts, enum pci_barno, u32 offset); 231int pci_epc_get_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no); 232int pci_epc_map_msi_irq(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 233 phys_addr_t phys_addr, u8 interrupt_num, 234 u32 entry_size, u32 *msi_data, u32 *msi_addr_offset); 235int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no, u8 vfunc_no, 236 enum pci_epc_irq_type type, u16 interrupt_num); 237int pci_epc_start(struct pci_epc *epc); 238void pci_epc_stop(struct pci_epc *epc); 239const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc, 240 u8 func_no, u8 vfunc_no); 241enum pci_barno 242pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features); 243enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features 244 *epc_features, enum pci_barno bar); 245struct pci_epc *pci_epc_get(const char *epc_name); 246void pci_epc_put(struct pci_epc *epc); 247 248int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t base, 249 size_t size, size_t page_size); 250int pci_epc_multi_mem_init(struct pci_epc *epc, 251 struct pci_epc_mem_window *window, 252 unsigned int num_windows); 253void pci_epc_mem_exit(struct pci_epc *epc); 254void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc, 255 phys_addr_t *phys_addr, size_t size); 256void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr, 257 void __iomem *virt_addr, size_t size); 258#endif /* __LINUX_PCI_EPC_H */