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_interface_type {
17 UNKNOWN_INTERFACE = -1,
18 PRIMARY_INTERFACE,
19 SECONDARY_INTERFACE,
20 };
21
22 static inline const char *
23 pci_epc_interface_string(enum pci_epc_interface_type type)
24 {
25 switch (type) {
26 case PRIMARY_INTERFACE:
27 return "primary";
28 case SECONDARY_INTERFACE:
29 return "secondary";
30 default:
31 return "UNKNOWN interface";
32 }
33 }
34
35 /**
36 * struct pci_epc_ops - set of function pointers for performing EPC operations
37 * @write_header: ops to populate configuration space header
38 * @set_bar: ops to configure the BAR
39 * @clear_bar: ops to reset the BAR
40 * @map_addr: ops to map CPU address to PCI address
41 * @unmap_addr: ops to unmap CPU address and PCI address
42 * @set_msi: ops to set the requested number of MSI interrupts in the MSI
43 * capability register
44 * @get_msi: ops to get the number of MSI interrupts allocated by the RC from
45 * the MSI capability register
46 * @set_msix: ops to set the requested number of MSI-X interrupts in the
47 * MSI-X capability register
48 * @get_msix: ops to get the number of MSI-X interrupts allocated by the RC
49 * from the MSI-X capability register
50 * @raise_irq: ops to raise a legacy, MSI or MSI-X interrupt
51 * @map_msi_irq: ops to map physical address to MSI address and return MSI data
52 * @start: ops to start the PCI link
53 * @stop: ops to stop the PCI link
54 * @get_features: ops to get the features supported by the EPC
55 * @owner: the module owner containing the ops
56 */
57 struct pci_epc_ops {
58 int (*write_header)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
59 struct pci_epf_header *hdr);
60 int (*set_bar)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
61 struct pci_epf_bar *epf_bar);
62 void (*clear_bar)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
63 struct pci_epf_bar *epf_bar);
64 int (*map_addr)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
65 phys_addr_t addr, u64 pci_addr, size_t size);
66 void (*unmap_addr)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
67 phys_addr_t addr);
68 int (*set_msi)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
69 u8 interrupts);
70 int (*get_msi)(struct pci_epc *epc, u8 func_no, u8 vfunc_no);
71 int (*set_msix)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
72 u16 interrupts, enum pci_barno, u32 offset);
73 int (*get_msix)(struct pci_epc *epc, u8 func_no, u8 vfunc_no);
74 int (*raise_irq)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
75 unsigned int type, u16 interrupt_num);
76 int (*map_msi_irq)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
77 phys_addr_t phys_addr, u8 interrupt_num,
78 u32 entry_size, u32 *msi_data,
79 u32 *msi_addr_offset);
80 int (*start)(struct pci_epc *epc);
81 void (*stop)(struct pci_epc *epc);
82 const struct pci_epc_features* (*get_features)(struct pci_epc *epc,
83 u8 func_no, u8 vfunc_no);
84 struct module *owner;
85 };
86
87 /**
88 * struct pci_epc_mem_window - address window of the endpoint controller
89 * @phys_base: physical base address of the PCI address window
90 * @size: the size of the PCI address window
91 * @page_size: size of each page
92 */
93 struct pci_epc_mem_window {
94 phys_addr_t phys_base;
95 size_t size;
96 size_t page_size;
97 };
98
99 /**
100 * struct pci_epc_mem - address space of the endpoint controller
101 * @window: address window of the endpoint controller
102 * @bitmap: bitmap to manage the PCI address space
103 * @pages: number of bits representing the address region
104 * @lock: mutex to protect bitmap
105 */
106 struct pci_epc_mem {
107 struct pci_epc_mem_window window;
108 unsigned long *bitmap;
109 int pages;
110 /* mutex to protect against concurrent access for memory allocation*/
111 struct mutex lock;
112 };
113
114 /**
115 * struct pci_epc - represents the PCI EPC device
116 * @dev: PCI EPC device
117 * @pci_epf: list of endpoint functions present in this EPC device
118 * @list_lock: Mutex for protecting pci_epf list
119 * @ops: function pointers for performing endpoint operations
120 * @windows: array of address space of the endpoint controller
121 * @mem: first window of the endpoint controller, which corresponds to
122 * default address space of the endpoint controller supporting
123 * single window.
124 * @num_windows: number of windows supported by device
125 * @max_functions: max number of functions that can be configured in this EPC
126 * @max_vfs: Array indicating the maximum number of virtual functions that can
127 * be associated with each physical function
128 * @group: configfs group representing the PCI EPC device
129 * @lock: mutex to protect pci_epc ops
130 * @function_num_map: bitmap to manage physical function number
131 * @init_complete: flag to indicate whether the EPC initialization is complete
132 * or not
133 */
134 struct pci_epc {
135 struct device dev;
136 struct list_head pci_epf;
137 struct mutex list_lock;
138 const struct pci_epc_ops *ops;
139 struct pci_epc_mem **windows;
140 struct pci_epc_mem *mem;
141 unsigned int num_windows;
142 u8 max_functions;
143 u8 *max_vfs;
144 struct config_group *group;
145 /* mutex to protect against concurrent access of EP controller */
146 struct mutex lock;
147 unsigned long function_num_map;
148 bool init_complete;
149 };
150
151 /**
152 * @BAR_PROGRAMMABLE: The BAR mask can be configured by the EPC.
153 * @BAR_FIXED: The BAR mask is fixed by the hardware.
154 * @BAR_RESERVED: The BAR should not be touched by an EPF driver.
155 */
156 enum pci_epc_bar_type {
157 BAR_PROGRAMMABLE = 0,
158 BAR_FIXED,
159 BAR_RESERVED,
160 };
161
162 /**
163 * struct pci_epc_bar_desc - hardware description for a BAR
164 * @type: the type of the BAR
165 * @fixed_size: the fixed size, only applicable if type is BAR_FIXED_MASK.
166 * @only_64bit: if true, an EPF driver is not allowed to choose if this BAR
167 * should be configured as 32-bit or 64-bit, the EPF driver must
168 * configure this BAR as 64-bit. Additionally, the BAR succeeding
169 * this BAR must be set to type BAR_RESERVED.
170 *
171 * only_64bit should not be set on a BAR of type BAR_RESERVED.
172 * (If BARx is a 64-bit BAR that an EPF driver is not allowed to
173 * touch, then both BARx and BARx+1 must be set to type
174 * BAR_RESERVED.)
175 */
176 struct pci_epc_bar_desc {
177 enum pci_epc_bar_type type;
178 u64 fixed_size;
179 bool only_64bit;
180 };
181
182 /**
183 * struct pci_epc_features - features supported by a EPC device per function
184 * @linkup_notifier: indicate if the EPC device can notify EPF driver on link up
185 * @msi_capable: indicate if the endpoint function has MSI capability
186 * @msix_capable: indicate if the endpoint function has MSI-X capability
187 * @bar: array specifying the hardware description for each BAR
188 * @align: alignment size required for BAR buffer allocation
189 */
190 struct pci_epc_features {
191 unsigned int linkup_notifier : 1;
192 unsigned int msi_capable : 1;
193 unsigned int msix_capable : 1;
194 struct pci_epc_bar_desc bar[PCI_STD_NUM_BARS];
195 size_t align;
196 };
197
198 #define to_pci_epc(device) container_of((device), struct pci_epc, dev)
199
200 #ifdef CONFIG_PCI_ENDPOINT
201
202 #define pci_epc_create(dev, ops) \
203 __pci_epc_create((dev), (ops), THIS_MODULE)
204 #define devm_pci_epc_create(dev, ops) \
205 __devm_pci_epc_create((dev), (ops), THIS_MODULE)
206
207 static inline void epc_set_drvdata(struct pci_epc *epc, void *data)
208 {
209 dev_set_drvdata(&epc->dev, data);
210 }
211
212 static inline void *epc_get_drvdata(struct pci_epc *epc)
213 {
214 return dev_get_drvdata(&epc->dev);
215 }
216
217 struct pci_epc *
218 __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
219 struct module *owner);
220 struct pci_epc *
221 __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
222 struct module *owner);
223 void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc);
224 void pci_epc_destroy(struct pci_epc *epc);
225 int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf,
226 enum pci_epc_interface_type type);
227 void pci_epc_linkup(struct pci_epc *epc);
228 void pci_epc_linkdown(struct pci_epc *epc);
229 void pci_epc_init_notify(struct pci_epc *epc);
230 void pci_epc_notify_pending_init(struct pci_epc *epc, struct pci_epf *epf);
231 void pci_epc_deinit_notify(struct pci_epc *epc);
232 void pci_epc_bus_master_enable_notify(struct pci_epc *epc);
233 void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf,
234 enum pci_epc_interface_type type);
235 int pci_epc_write_header(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
236 struct pci_epf_header *hdr);
237 int pci_epc_set_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
238 struct pci_epf_bar *epf_bar);
239 void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
240 struct pci_epf_bar *epf_bar);
241 int pci_epc_map_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
242 phys_addr_t phys_addr,
243 u64 pci_addr, size_t size);
244 void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
245 phys_addr_t phys_addr);
246 int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
247 u8 interrupts);
248 int pci_epc_get_msi(struct pci_epc *epc, u8 func_no, u8 vfunc_no);
249 int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
250 u16 interrupts, enum pci_barno, u32 offset);
251 int pci_epc_get_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no);
252 int pci_epc_map_msi_irq(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
253 phys_addr_t phys_addr, u8 interrupt_num,
254 u32 entry_size, u32 *msi_data, u32 *msi_addr_offset);
255 int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
256 unsigned int type, u16 interrupt_num);
257 int pci_epc_start(struct pci_epc *epc);
258 void pci_epc_stop(struct pci_epc *epc);
259 const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
260 u8 func_no, u8 vfunc_no);
261 enum pci_barno
262 pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features);
263 enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features
264 *epc_features, enum pci_barno bar);
265 struct pci_epc *pci_epc_get(const char *epc_name);
266 void pci_epc_put(struct pci_epc *epc);
267
268 int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t base,
269 size_t size, size_t page_size);
270 int pci_epc_multi_mem_init(struct pci_epc *epc,
271 struct pci_epc_mem_window *window,
272 unsigned int num_windows);
273 void pci_epc_mem_exit(struct pci_epc *epc);
274 void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
275 phys_addr_t *phys_addr, size_t size);
276 void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
277 void __iomem *virt_addr, size_t size);
278
279 #else
280 static inline void pci_epc_init_notify(struct pci_epc *epc)
281 {
282 }
283
284 static inline void pci_epc_deinit_notify(struct pci_epc *epc)
285 {
286 }
287 #endif /* CONFIG_PCI_ENDPOINT */
288 #endif /* __LINUX_PCI_EPC_H */
289
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