1 /* SPDX-License-Identifier: GPL-2.0 */
3 * PCI Endpoint *Controller* (EPC) header file
5 * Copyright (C) 2017 Texas Instruments
6 * Author: Kishon Vijay Abraham I <kishon@ti.com>
9 #ifndef __LINUX_PCI_EPC_H
10 #define __LINUX_PCI_EPC_H
12 #include <linux/pci-epf.h>
16 enum pci_epc_interface_type {
17 UNKNOWN_INTERFACE = -1,
22 enum pci_epc_irq_type {
29 static inline const char *
30 pci_epc_interface_string(enum pci_epc_interface_type type)
33 case PRIMARY_INTERFACE:
35 case SECONDARY_INTERFACE:
38 return "UNKNOWN interface";
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
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
65 int (*write_header)(struct pci_epc *epc, u8 func_no,
66 struct pci_epf_header *hdr);
67 int (*set_bar)(struct pci_epc *epc, u8 func_no,
68 struct pci_epf_bar *epf_bar);
69 void (*clear_bar)(struct pci_epc *epc, u8 func_no,
70 struct pci_epf_bar *epf_bar);
71 int (*map_addr)(struct pci_epc *epc, u8 func_no,
72 phys_addr_t addr, u64 pci_addr, size_t size);
73 void (*unmap_addr)(struct pci_epc *epc, u8 func_no,
75 int (*set_msi)(struct pci_epc *epc, u8 func_no, u8 interrupts);
76 int (*get_msi)(struct pci_epc *epc, u8 func_no);
77 int (*set_msix)(struct pci_epc *epc, u8 func_no, u16 interrupts,
78 enum pci_barno, u32 offset);
79 int (*get_msix)(struct pci_epc *epc, u8 func_no);
80 int (*raise_irq)(struct pci_epc *epc, u8 func_no,
81 enum pci_epc_irq_type type, u16 interrupt_num);
82 int (*map_msi_irq)(struct pci_epc *epc, u8 func_no,
83 phys_addr_t phys_addr, u8 interrupt_num,
84 u32 entry_size, u32 *msi_data,
85 u32 *msi_addr_offset);
86 int (*start)(struct pci_epc *epc);
87 void (*stop)(struct pci_epc *epc);
88 const struct pci_epc_features* (*get_features)(struct pci_epc *epc,
94 * struct pci_epc_mem_window - address window of the endpoint controller
95 * @phys_base: physical base address of the PCI address window
96 * @size: the size of the PCI address window
97 * @page_size: size of each page
99 struct pci_epc_mem_window {
100 phys_addr_t phys_base;
106 * struct pci_epc_mem - address space of the endpoint controller
107 * @window: address window of the endpoint controller
108 * @bitmap: bitmap to manage the PCI address space
109 * @pages: number of bits representing the address region
110 * @lock: mutex to protect bitmap
113 struct pci_epc_mem_window window;
114 unsigned long *bitmap;
116 /* mutex to protect against concurrent access for memory allocation*/
121 * struct pci_epc - represents the PCI EPC device
122 * @dev: PCI EPC device
123 * @pci_epf: list of endpoint functions present in this EPC device
124 * @ops: function pointers for performing endpoint operations
125 * @windows: array of address space of the endpoint controller
126 * @mem: first window of the endpoint controller, which corresponds to
127 * default address space of the endpoint controller supporting
129 * @num_windows: number of windows supported by device
130 * @max_functions: max number of functions that can be configured in this EPC
131 * @group: configfs group representing the PCI EPC device
132 * @lock: mutex to protect pci_epc ops
133 * @function_num_map: bitmap to manage physical function number
134 * @notifier: used to notify EPF of any EPC events (like linkup)
138 struct list_head pci_epf;
139 const struct pci_epc_ops *ops;
140 struct pci_epc_mem **windows;
141 struct pci_epc_mem *mem;
142 unsigned int num_windows;
144 struct config_group *group;
145 /* mutex to protect against concurrent access of EP controller */
147 unsigned long function_num_map;
148 struct atomic_notifier_head notifier;
152 * struct pci_epc_features - features supported by a EPC device per function
153 * @linkup_notifier: indicate if the EPC device can notify EPF driver on link up
154 * @core_init_notifier: indicate cores that can notify about their availability
156 * @msi_capable: indicate if the endpoint function has MSI capability
157 * @msix_capable: indicate if the endpoint function has MSI-X capability
158 * @reserved_bar: bitmap to indicate reserved BAR unavailable to function driver
159 * @bar_fixed_64bit: bitmap to indicate fixed 64bit BARs
160 * @bar_fixed_size: Array specifying the size supported by each BAR
161 * @align: alignment size required for BAR buffer allocation
163 struct pci_epc_features {
164 unsigned int linkup_notifier : 1;
165 unsigned int core_init_notifier : 1;
166 unsigned int msi_capable : 1;
167 unsigned int msix_capable : 1;
170 u64 bar_fixed_size[PCI_STD_NUM_BARS];
174 #define to_pci_epc(device) container_of((device), struct pci_epc, dev)
176 #define pci_epc_create(dev, ops) \
177 __pci_epc_create((dev), (ops), THIS_MODULE)
178 #define devm_pci_epc_create(dev, ops) \
179 __devm_pci_epc_create((dev), (ops), THIS_MODULE)
181 static inline void epc_set_drvdata(struct pci_epc *epc, void *data)
183 dev_set_drvdata(&epc->dev, data);
186 static inline void *epc_get_drvdata(struct pci_epc *epc)
188 return dev_get_drvdata(&epc->dev);
192 pci_epc_register_notifier(struct pci_epc *epc, struct notifier_block *nb)
194 return atomic_notifier_chain_register(&epc->notifier, nb);
198 __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
199 struct module *owner);
201 __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
202 struct module *owner);
203 void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc);
204 void pci_epc_destroy(struct pci_epc *epc);
205 int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf,
206 enum pci_epc_interface_type type);
207 void pci_epc_linkup(struct pci_epc *epc);
208 void pci_epc_init_notify(struct pci_epc *epc);
209 void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf,
210 enum pci_epc_interface_type type);
211 int pci_epc_write_header(struct pci_epc *epc, u8 func_no,
212 struct pci_epf_header *hdr);
213 int pci_epc_set_bar(struct pci_epc *epc, u8 func_no,
214 struct pci_epf_bar *epf_bar);
215 void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no,
216 struct pci_epf_bar *epf_bar);
217 int pci_epc_map_addr(struct pci_epc *epc, u8 func_no,
218 phys_addr_t phys_addr,
219 u64 pci_addr, size_t size);
220 void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no,
221 phys_addr_t phys_addr);
222 int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts);
223 int pci_epc_get_msi(struct pci_epc *epc, u8 func_no);
224 int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts,
225 enum pci_barno, u32 offset);
226 int pci_epc_get_msix(struct pci_epc *epc, u8 func_no);
227 int pci_epc_map_msi_irq(struct pci_epc *epc, u8 func_no,
228 phys_addr_t phys_addr, u8 interrupt_num,
229 u32 entry_size, u32 *msi_data, u32 *msi_addr_offset);
230 int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
231 enum pci_epc_irq_type type, u16 interrupt_num);
232 int pci_epc_start(struct pci_epc *epc);
233 void pci_epc_stop(struct pci_epc *epc);
234 const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
237 pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features);
238 enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features
239 *epc_features, enum pci_barno bar);
240 struct pci_epc *pci_epc_get(const char *epc_name);
241 void pci_epc_put(struct pci_epc *epc);
243 int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t base,
244 size_t size, size_t page_size);
245 int pci_epc_multi_mem_init(struct pci_epc *epc,
246 struct pci_epc_mem_window *window,
247 unsigned int num_windows);
248 void pci_epc_mem_exit(struct pci_epc *epc);
249 void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
250 phys_addr_t *phys_addr, size_t size);
251 void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
252 void __iomem *virt_addr, size_t size);
253 #endif /* __LINUX_PCI_EPC_H */