/* SPDX-License-Identifier: GPL-2.0 */
/*
* PCI Endpoint * Controller * ( EPC ) header file
*
* Copyright ( C ) 2017 Texas Instruments
* Author : Kishon Vijay Abraham I < kishon @ ti . com >
*/
#ifndef __LINUX_PCI_EPC_H
#define __LINUX_PCI_EPC_H
#include <linux/pci-epf.h>
struct pci_epc;
enum pci_epc_interface_type {
UNKNOWN_INTERFACE = -1 ,
PRIMARY_INTERFACE,
SECONDARY_INTERFACE,
};
static inline const char *
pci_epc_interface_string(enum pci_epc_interface_type type)
{
switch (type) {
case PRIMARY_INTERFACE:
return "primary" ;
case SECONDARY_INTERFACE:
return "secondary" ;
default :
return "UNKNOWN interface" ;
}
}
/**
* struct pci_epc_map - information about EPC memory for mapping a RC PCI
* address range
* @ pci_addr : start address of the RC PCI address range to map
* @ pci_size : size of the RC PCI address range mapped from @ pci_addr
* @ map_pci_addr : RC PCI address used as the first address mapped ( may be lower
* than @ pci_addr )
* @ map_size : size of the controller memory needed for mapping the RC PCI address
* range @ map_pci_addr . . @ pci_addr + @ pci_size
* @ phys_base : base physical address of the allocated EPC memory for mapping the
* RC PCI address range
* @ phys_addr : physical address at which @ pci_addr is mapped
* @ virt_base : base virtual address of the allocated EPC memory for mapping the
* RC PCI address range
* @ virt_addr : virtual address at which @ pci_addr is mapped
*/
struct pci_epc_map {
u64 pci_addr;
size_t pci_size;
u64 map_pci_addr;
size_t map_size;
phys_addr_t phys_base;
phys_addr_t phys_addr;
void __iomem *virt_base;
void __iomem *virt_addr;
};
/**
* struct pci_epc_ops - set of function pointers for performing EPC operations
* @ write_header : ops to populate configuration space header
* @ set_bar : ops to configure the BAR
* @ clear_bar : ops to reset the BAR
* @ align_addr : operation to get the mapping address , mapping size and offset
* into a controller memory window needed to map an RC PCI address
* region
* @ map_addr : ops to map CPU address to PCI address
* @ unmap_addr : ops to unmap CPU address and PCI address
* @ set_msi : ops to set the requested number of MSI interrupts in the MSI
* capability register
* @ get_msi : ops to get the number of MSI interrupts allocated by the RC from
* the MSI capability register
* @ set_msix : ops to set the requested number of MSI - X interrupts in the
* MSI - X capability register
* @ get_msix : ops to get the number of MSI - X interrupts allocated by the RC
* from the MSI - X capability register
* @ raise_irq : ops to raise a legacy , MSI or MSI - X interrupt
* @ map_msi_irq : ops to map physical address to MSI address and return MSI data
* @ start : ops to start the PCI link
* @ stop : ops to stop the PCI link
* @ get_features : ops to get the features supported by the EPC
* @ owner : the module owner containing the ops
*/
struct pci_epc_ops {
int (*write_header)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
struct pci_epf_header *hdr);
int (*set_bar)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
struct pci_epf_bar *epf_bar);
void (*clear_bar)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
struct pci_epf_bar *epf_bar);
u64 (*align_addr)(struct pci_epc *epc, u64 pci_addr, size_t *size,
size_t *offset);
int (*map_addr)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
phys_addr_t addr, u64 pci_addr, size_t size);
void (*unmap_addr)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
phys_addr_t addr);
int (*set_msi)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
u8 nr_irqs);
int (*get_msi)(struct pci_epc *epc, u8 func_no, u8 vfunc_no);
int (*set_msix)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
u16 nr_irqs, enum pci_barno, u32 offset);
int (*get_msix)(struct pci_epc *epc, u8 func_no, u8 vfunc_no);
int (*raise_irq)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
unsigned int type, u16 interrupt_num);
int (*map_msi_irq)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
phys_addr_t phys_addr, u8 interrupt_num,
u32 entry_size, u32 *msi_data,
u32 *msi_addr_offset);
int (*start)(struct pci_epc *epc);
void (*stop)(struct pci_epc *epc);
const struct pci_epc_features* (*get_features)(struct pci_epc *epc,
u8 func_no, u8 vfunc_no);
struct module *owner;
};
/**
* struct pci_epc_mem_window - address window of the endpoint controller
* @ phys_base : physical base address of the PCI address window
* @ size : the size of the PCI address window
* @ page_size : size of each page
*/
struct pci_epc_mem_window {
phys_addr_t phys_base;
size_t size;
size_t page_size;
};
/**
* struct pci_epc_mem - address space of the endpoint controller
* @ window : address window of the endpoint controller
* @ bitmap : bitmap to manage the PCI address space
* @ pages : number of bits representing the address region
* @ lock : mutex to protect bitmap
*/
struct pci_epc_mem {
struct pci_epc_mem_window window;
unsigned long *bitmap;
int pages;
/* mutex to protect against concurrent access for memory allocation*/
struct mutex lock;
};
/**
* struct pci_epc - represents the PCI EPC device
* @ dev : PCI EPC device
* @ pci_epf : list of endpoint functions present in this EPC device
* @ list_lock : Mutex for protecting pci_epf list
* @ ops : function pointers for performing endpoint operations
* @ windows : array of address space of the endpoint controller
* @ mem : first window of the endpoint controller , which corresponds to
* default address space of the endpoint controller supporting
* single window .
* @ num_windows : number of windows supported by device
* @ max_functions : max number of functions that can be configured in this EPC
* @ max_vfs : Array indicating the maximum number of virtual functions that can
* be associated with each physical function
* @ group : configfs group representing the PCI EPC device
* @ lock : mutex to protect pci_epc ops
* @ function_num_map : bitmap to manage physical function number
* @ domain_nr : PCI domain number of the endpoint controller
* @ init_complete : flag to indicate whether the EPC initialization is complete
* or not
*/
struct pci_epc {
struct device dev;
struct list_head pci_epf;
struct mutex list_lock;
const struct pci_epc_ops *ops;
struct pci_epc_mem **windows;
struct pci_epc_mem *mem;
unsigned int num_windows;
u8 max_functions;
u8 *max_vfs;
struct config_group *group;
/* mutex to protect against concurrent access of EP controller */
struct mutex lock;
unsigned long function_num_map;
int domain_nr;
bool init_complete;
};
/**
* enum pci_epc_bar_type - configurability of endpoint BAR
* @ BAR_PROGRAMMABLE : The BAR mask can be configured by the EPC .
* @ BAR_FIXED : The BAR mask is fixed by the hardware .
* @ BAR_RESIZABLE : The BAR implements the PCI - SIG Resizable BAR Capability .
* NOTE : An EPC driver can currently only set a single supported
* size .
* @ BAR_RESERVED : The BAR should not be touched by an EPF driver .
*/
enum pci_epc_bar_type {
BAR_PROGRAMMABLE = 0 ,
BAR_FIXED,
BAR_RESIZABLE,
BAR_RESERVED,
};
/**
* struct pci_epc_bar_desc - hardware description for a BAR
* @ type : the type of the BAR
* @ fixed_size : the fixed size , only applicable if type is BAR_FIXED_MASK .
* @ only_64bit : if true , an EPF driver is not allowed to choose if this BAR
* should be configured as 32 - bit or 64 - bit , the EPF driver must
* configure this BAR as 64 - bit . Additionally , the BAR succeeding
* this BAR must be set to type BAR_RESERVED .
*
* only_64bit should not be set on a BAR of type BAR_RESERVED .
* ( If BARx is a 64 - bit BAR that an EPF driver is not allowed to
* touch , then both BARx and BARx + 1 must be set to type
* BAR_RESERVED . )
*/
struct pci_epc_bar_desc {
enum pci_epc_bar_type type;
u64 fixed_size;
bool only_64bit;
};
/**
* struct pci_epc_features - features supported by a EPC device per function
* @ linkup_notifier : indicate if the EPC device can notify EPF driver on link up
* @ msi_capable : indicate if the endpoint function has MSI capability
* @ msix_capable : indicate if the endpoint function has MSI - X capability
* @ intx_capable : indicate if the endpoint can raise INTx interrupts
* @ bar : array specifying the hardware description for each BAR
* @ align : alignment size required for BAR buffer allocation
*/
struct pci_epc_features {
unsigned int linkup_notifier : 1 ;
unsigned int msi_capable : 1 ;
unsigned int msix_capable : 1 ;
unsigned int intx_capable : 1 ;
struct pci_epc_bar_desc bar[PCI_STD_NUM_BARS];
size_t align;
};
#define to_pci_epc(device) container_of((device), struct pci_epc, dev)
#ifdef CONFIG_PCI_ENDPOINT
#define pci_epc_create(dev, ops) \
__pci_epc_create((dev), (ops), THIS_MODULE)
#define devm_pci_epc_create(dev, ops) \
__devm_pci_epc_create((dev), (ops), THIS_MODULE)
static inline void epc_set_drvdata(struct pci_epc *epc, void *data)
{
dev_set_drvdata(&epc->dev, data);
}
static inline void *epc_get_drvdata(struct pci_epc *epc)
{
return dev_get_drvdata(&epc->dev);
}
struct pci_epc *
__devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
struct module *owner);
struct pci_epc *
__pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
struct module *owner);
void pci_epc_destroy(struct pci_epc *epc);
int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf,
enum pci_epc_interface_type type);
void pci_epc_linkup(struct pci_epc *epc);
void pci_epc_linkdown(struct pci_epc *epc);
void pci_epc_init_notify(struct pci_epc *epc);
void pci_epc_notify_pending_init(struct pci_epc *epc, struct pci_epf *epf);
void pci_epc_deinit_notify(struct pci_epc *epc);
void pci_epc_bus_master_enable_notify(struct pci_epc *epc);
void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf,
enum pci_epc_interface_type type);
int pci_epc_write_header(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
struct pci_epf_header *hdr);
int pci_epc_bar_size_to_rebar_cap(size_t size, u32 *cap);
int pci_epc_set_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
struct pci_epf_bar *epf_bar);
void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
struct pci_epf_bar *epf_bar);
int pci_epc_map_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
phys_addr_t phys_addr,
u64 pci_addr, size_t size);
void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
phys_addr_t phys_addr);
int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 vfunc_no, u8 nr_irqs);
int pci_epc_get_msi(struct pci_epc *epc, u8 func_no, u8 vfunc_no);
int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no, u16 nr_irqs,
enum pci_barno, u32 offset);
int pci_epc_get_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no);
int pci_epc_map_msi_irq(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
phys_addr_t phys_addr, u8 interrupt_num,
u32 entry_size, u32 *msi_data, u32 *msi_addr_offset);
int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
unsigned int type, u16 interrupt_num);
int pci_epc_start(struct pci_epc *epc);
void pci_epc_stop(struct pci_epc *epc);
const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
u8 func_no, u8 vfunc_no);
enum pci_barno
pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features);
enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features
*epc_features, enum pci_barno bar);
struct pci_epc *pci_epc_get(const char *epc_name);
void pci_epc_put(struct pci_epc *epc);
int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t base,
size_t size, size_t page_size);
int pci_epc_multi_mem_init(struct pci_epc *epc,
struct pci_epc_mem_window *window,
unsigned int num_windows);
void pci_epc_mem_exit(struct pci_epc *epc);
void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
phys_addr_t *phys_addr, size_t size);
void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
void __iomem *virt_addr, size_t size);
int pci_epc_mem_map(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
u64 pci_addr, size_t pci_size, struct pci_epc_map *map);
void pci_epc_mem_unmap(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
struct pci_epc_map *map);
#else
static inline void pci_epc_init_notify(struct pci_epc *epc)
{
}
static inline void pci_epc_deinit_notify(struct pci_epc *epc)
{
}
#endif /* CONFIG_PCI_ENDPOINT */
#endif /* __LINUX_PCI_EPC_H */
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