1 /* SPDX-License-Identifier: GPL-2.0 */
3 * PCI Endpoint *Controller* (EPC) header file
5 * Copyright (C) 2017 Texas Instruments
9 #ifndef __LINUX_PCI_EPC_H
10 #define __LINUX_PCI_EPC_H
12 #include <linux/pci-epf.h>
16 enum pci_epc_irq_type {
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
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
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 struct pci_epf_bar *epf_bar);
43 void (*clear_bar)(struct pci_epc *epc, u8 func_no,
44 struct pci_epf_bar *epf_bar);
45 int (*map_addr)(struct pci_epc *epc, u8 func_no,
46 phys_addr_t addr, u64 pci_addr, size_t size);
47 void (*unmap_addr)(struct pci_epc *epc, u8 func_no,
49 int (*set_msi)(struct pci_epc *epc, u8 func_no, u8 interrupts);
50 int (*get_msi)(struct pci_epc *epc, u8 func_no);
51 int (*raise_irq)(struct pci_epc *epc, u8 func_no,
52 enum pci_epc_irq_type type, u8 interrupt_num);
53 int (*start)(struct pci_epc *epc);
54 void (*stop)(struct pci_epc *epc);
59 * struct pci_epc_mem - address space of the endpoint controller
60 * @phys_base: physical base address of the PCI address space
61 * @size: the size of the PCI address space
62 * @bitmap: bitmap to manage the PCI address space
63 * @pages: number of bits representing the address region
64 * @page_size: size of each page
67 phys_addr_t phys_base;
69 unsigned long *bitmap;
75 * struct pci_epc - represents the PCI EPC device
76 * @dev: PCI EPC device
77 * @pci_epf: list of endpoint functions present in this EPC device
78 * @ops: function pointers for performing endpoint operations
79 * @mem: address space of the endpoint controller
80 * @max_functions: max number of functions that can be configured in this EPC
81 * @group: configfs group representing the PCI EPC device
82 * @lock: spinlock to protect pci_epc ops
86 struct list_head pci_epf;
87 const struct pci_epc_ops *ops;
88 struct pci_epc_mem *mem;
90 struct config_group *group;
91 /* spinlock to protect against concurrent access of EP controller */
93 unsigned int features;
96 #define EPC_FEATURE_NO_LINKUP_NOTIFIER BIT(0)
97 #define EPC_FEATURE_BAR_MASK (BIT(1) | BIT(2) | BIT(3))
98 #define EPC_FEATURE_SET_BAR(features, bar) \
99 (features |= (EPC_FEATURE_BAR_MASK & (bar << 1)))
100 #define EPC_FEATURE_GET_BAR(features) \
101 ((features & EPC_FEATURE_BAR_MASK) >> 1)
103 #define to_pci_epc(device) container_of((device), struct pci_epc, dev)
105 #define pci_epc_create(dev, ops) \
106 __pci_epc_create((dev), (ops), THIS_MODULE)
107 #define devm_pci_epc_create(dev, ops) \
108 __devm_pci_epc_create((dev), (ops), THIS_MODULE)
110 #define pci_epc_mem_init(epc, phys_addr, size) \
111 __pci_epc_mem_init((epc), (phys_addr), (size), PAGE_SIZE)
113 static inline void epc_set_drvdata(struct pci_epc *epc, void *data)
115 dev_set_drvdata(&epc->dev, data);
118 static inline void *epc_get_drvdata(struct pci_epc *epc)
120 return dev_get_drvdata(&epc->dev);
124 __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
125 struct module *owner);
127 __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
128 struct module *owner);
129 void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc);
130 void pci_epc_destroy(struct pci_epc *epc);
131 int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf);
132 void pci_epc_linkup(struct pci_epc *epc);
133 void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf);
134 int pci_epc_write_header(struct pci_epc *epc, u8 func_no,
135 struct pci_epf_header *hdr);
136 int pci_epc_set_bar(struct pci_epc *epc, u8 func_no,
137 struct pci_epf_bar *epf_bar);
138 void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no,
139 struct pci_epf_bar *epf_bar);
140 int pci_epc_map_addr(struct pci_epc *epc, u8 func_no,
141 phys_addr_t phys_addr,
142 u64 pci_addr, size_t size);
143 void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no,
144 phys_addr_t phys_addr);
145 int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts);
146 int pci_epc_get_msi(struct pci_epc *epc, u8 func_no);
147 int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
148 enum pci_epc_irq_type type, u8 interrupt_num);
149 int pci_epc_start(struct pci_epc *epc);
150 void pci_epc_stop(struct pci_epc *epc);
151 struct pci_epc *pci_epc_get(const char *epc_name);
152 void pci_epc_put(struct pci_epc *epc);
154 int __pci_epc_mem_init(struct pci_epc *epc, phys_addr_t phys_addr, size_t size,
156 void pci_epc_mem_exit(struct pci_epc *epc);
157 void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
158 phys_addr_t *phys_addr, size_t size);
159 void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
160 void __iomem *virt_addr, size_t size);
161 #endif /* __LINUX_PCI_EPC_H */