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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* RapidIO interconnect services
* (RapidIO Interconnect Specification, http://www.rapidio.org)
*
* Copyright 2005 MontaVista Software, Inc.
* Matt Porter <mporter@kernel.crashing.org>
*/
#ifndef LINUX_RIO_H
#define LINUX_RIO_H
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/rio_regs.h>
#include <linux/mod_devicetable.h>
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
#include <linux/dmaengine.h>
#endif
#define RIO_NO_HOPCOUNT -1
#define RIO_INVALID_DESTID 0xffff
#define RIO_MAX_MPORTS 8
#define RIO_MAX_MPORT_RESOURCES 16
#define RIO_MAX_DEV_RESOURCES 16
#define RIO_MAX_MPORT_NAME 40
#define RIO_GLOBAL_TABLE 0xff /* Indicates access of a switch's
global routing table if it
has multiple (or per port)
tables */
#define RIO_INVALID_ROUTE 0xff /* Indicates that a route table
entry is invalid (no route
exists for the device ID) */
#define RIO_MAX_ROUTE_ENTRIES(size) (size ? (1 << 16) : (1 << 8))
#define RIO_ANY_DESTID(size) (size ? 0xffff : 0xff)
#define RIO_MAX_MBOX 4
#define RIO_MAX_MSG_SIZE 0x1000
/*
* Error values that may be returned by RIO functions.
*/
#define RIO_SUCCESSFUL 0x00
#define RIO_BAD_SIZE 0x81
/*
* For RIO devices, the region numbers are assigned this way:
*
* 0 RapidIO outbound doorbells
* 1-15 RapidIO memory regions
*
* For RIO master ports, the region number are assigned this way:
*
* 0 RapidIO inbound doorbells
* 1 RapidIO inbound mailboxes
* 2 RapidIO outbound mailboxes
*/
#define RIO_DOORBELL_RESOURCE 0
#define RIO_INB_MBOX_RESOURCE 1
#define RIO_OUTB_MBOX_RESOURCE 2
#define RIO_PW_MSG_SIZE 64
/*
* A component tag value (stored in the component tag CSR) is used as device's
* unique identifier assigned during enumeration. Besides being used for
* identifying switches (which do not have device ID register), it also is used
* by error management notification and therefore has to be assigned
* to endpoints as well.
*/
#define RIO_CTAG_RESRVD 0xfffe0000 /* Reserved */
#define RIO_CTAG_UDEVID 0x0001ffff /* Unique device identifier */
extern struct bus_type rio_bus_type;
extern struct class rio_mport_class;
struct rio_mport;
struct rio_dev;
union rio_pw_msg;
/**
* struct rio_switch - RIO switch info
* @node: Node in global list of switches
* @route_table: Copy of switch routing table
* @port_ok: Status of each port (one bit per port) - OK=1 or UNINIT=0
* @ops: pointer to switch-specific operations
* @lock: lock to serialize operations updates
* @nextdev: Array of per-port pointers to the next attached device
*/
struct rio_switch {
struct list_head node;
u8 *route_table;
u32 port_ok;
struct rio_switch_ops *ops;
spinlock_t lock;
struct rio_dev *nextdev[];
};
/**
* struct rio_switch_ops - Per-switch operations
* @owner: The module owner of this structure
* @add_entry: Callback for switch-specific route add function
* @get_entry: Callback for switch-specific route get function
* @clr_table: Callback for switch-specific clear route table function
* @set_domain: Callback for switch-specific domain setting function
* @get_domain: Callback for switch-specific domain get function
* @em_init: Callback for switch-specific error management init function
* @em_handle: Callback for switch-specific error management handler function
*
* Defines the operations that are necessary to initialize/control
* a particular RIO switch device.
*/
struct rio_switch_ops {
struct module *owner;
int (*add_entry) (struct rio_mport *mport, u16 destid, u8 hopcount,
u16 table, u16 route_destid, u8 route_port);
int (*get_entry) (struct rio_mport *mport, u16 destid, u8 hopcount,
u16 table, u16 route_destid, u8 *route_port);
int (*clr_table) (struct rio_mport *mport, u16 destid, u8 hopcount,
u16 table);
int (*set_domain) (struct rio_mport *mport, u16 destid, u8 hopcount,
u8 sw_domain);
int (*get_domain) (struct rio_mport *mport, u16 destid, u8 hopcount,
u8 *sw_domain);
int (*em_init) (struct rio_dev *dev);
int (*em_handle) (struct rio_dev *dev, u8 swport);
};
enum rio_device_state {
RIO_DEVICE_INITIALIZING,
RIO_DEVICE_RUNNING,
RIO_DEVICE_GONE,
RIO_DEVICE_SHUTDOWN,
};
/**
* struct rio_dev - RIO device info
* @global_list: Node in list of all RIO devices
* @net_list: Node in list of RIO devices in a network
* @net: Network this device is a part of
* @do_enum: Enumeration flag
* @did: Device ID
* @vid: Vendor ID
* @device_rev: Device revision
* @asm_did: Assembly device ID
* @asm_vid: Assembly vendor ID
* @asm_rev: Assembly revision
* @efptr: Extended feature pointer
* @pef: Processing element features
* @swpinfo: Switch port info
* @src_ops: Source operation capabilities
* @dst_ops: Destination operation capabilities
* @comp_tag: RIO component tag
* @phys_efptr: RIO device extended features pointer
* @phys_rmap: LP-Serial Register Map Type (1 or 2)
* @em_efptr: RIO Error Management features pointer
* @dma_mask: Mask of bits of RIO address this device implements
* @driver: Driver claiming this device
* @dev: Device model device
* @riores: RIO resources this device owns
* @pwcback: port-write callback function for this device
* @destid: Network destination ID (or associated destid for switch)
* @hopcount: Hopcount to this device
* @prev: Previous RIO device connected to the current one
* @state: device state
* @rswitch: struct rio_switch (if valid for this device)
*/
struct rio_dev {
struct list_head global_list; /* node in list of all RIO devices */
struct list_head net_list; /* node in per net list */
struct rio_net *net; /* RIO net this device resides in */
bool do_enum;
u16 did;
u16 vid;
u32 device_rev;
u16 asm_did;
u16 asm_vid;
u16 asm_rev;
u16 efptr;
u32 pef;
u32 swpinfo;
u32 src_ops;
u32 dst_ops;
u32 comp_tag;
u32 phys_efptr;
u32 phys_rmap;
u32 em_efptr;
u64 dma_mask;
struct rio_driver *driver; /* RIO driver claiming this device */
struct device dev; /* LDM device structure */
struct resource riores[RIO_MAX_DEV_RESOURCES];
int (*pwcback) (struct rio_dev *rdev, union rio_pw_msg *msg, int step);
u16 destid;
u8 hopcount;
struct rio_dev *prev;
atomic_t state;
struct rio_switch rswitch[]; /* RIO switch info */
};
#define rio_dev_g(n) list_entry(n, struct rio_dev, global_list)
#define rio_dev_f(n) list_entry(n, struct rio_dev, net_list)
#define to_rio_dev(n) container_of(n, struct rio_dev, dev)
#define sw_to_rio_dev(n) container_of(n, struct rio_dev, rswitch[0])
#define to_rio_mport(n) container_of(n, struct rio_mport, dev)
#define to_rio_net(n) container_of(n, struct rio_net, dev)
/**
* struct rio_msg - RIO message event
* @res: Mailbox resource
* @mcback: Message event callback
*/
struct rio_msg {
struct resource *res;
void (*mcback) (struct rio_mport * mport, void *dev_id, int mbox, int slot);
};
/**
* struct rio_dbell - RIO doorbell event
* @node: Node in list of doorbell events
* @res: Doorbell resource
* @dinb: Doorbell event callback
* @dev_id: Device specific pointer to pass on event
*/
struct rio_dbell {
struct list_head node;
struct resource *res;
void (*dinb) (struct rio_mport *mport, void *dev_id, u16 src, u16 dst, u16 info);
void *dev_id;
};
/**
* struct rio_mport - RIO master port info
* @dbells: List of doorbell events
* @pwrites: List of portwrite events
* @node: Node in global list of master ports
* @nnode: Node in network list of master ports
* @net: RIO net this mport is attached to
* @lock: lock to synchronize lists manipulations
* @iores: I/O mem resource that this master port interface owns
* @riores: RIO resources that this master port interfaces owns
* @inb_msg: RIO inbound message event descriptors
* @outb_msg: RIO outbound message event descriptors
* @host_deviceid: Host device ID associated with this master port
* @ops: configuration space functions
* @id: Port ID, unique among all ports
* @index: Port index, unique among all port interfaces of the same type
* @sys_size: RapidIO common transport system size
* @phys_efptr: RIO port extended features pointer
* @phys_rmap: LP-Serial EFB Register Mapping type (1 or 2).
* @name: Port name string
* @dev: device structure associated with an mport
* @priv: Master port private data
* @dma: DMA device associated with mport
* @nscan: RapidIO network enumeration/discovery operations
* @state: mport device state
* @pwe_refcnt: port-write enable ref counter to track enable/disable requests
*/
struct rio_mport {
struct list_head dbells; /* list of doorbell events */
struct list_head pwrites; /* list of portwrite events */
struct list_head node; /* node in global list of ports */
struct list_head nnode; /* node in net list of ports */
struct rio_net *net; /* RIO net this mport is attached to */
struct mutex lock;
struct resource iores;
struct resource riores[RIO_MAX_MPORT_RESOURCES];
struct rio_msg inb_msg[RIO_MAX_MBOX];
struct rio_msg outb_msg[RIO_MAX_MBOX];
int host_deviceid; /* Host device ID */
struct rio_ops *ops; /* low-level architecture-dependent routines */
unsigned char id; /* port ID, unique among all ports */
unsigned char index; /* port index, unique among all port
interfaces of the same type */
unsigned int sys_size; /* RapidIO common transport system size.
* 0 - Small size. 256 devices.
* 1 - Large size, 65536 devices.
*/
u32 phys_efptr;
u32 phys_rmap;
unsigned char name[RIO_MAX_MPORT_NAME];
struct device dev;
void *priv; /* Master port private data */
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
struct dma_device dma;
#endif
struct rio_scan *nscan;
atomic_t state;
unsigned int pwe_refcnt;
};
static inline int rio_mport_is_running(struct rio_mport *mport)
{
return atomic_read(&mport->state) == RIO_DEVICE_RUNNING;
}
/*
* Enumeration/discovery control flags
*/
#define RIO_SCAN_ENUM_NO_WAIT 0x00000001 /* Do not wait for enum completed */
/**
* struct rio_net - RIO network info
* @node: Node in global list of RIO networks
* @devices: List of devices in this network
* @switches: List of switches in this network
* @mports: List of master ports accessing this network
* @hport: Default port for accessing this network
* @id: RIO network ID
* @dev: Device object
* @enum_data: private data specific to a network enumerator
* @release: enumerator-specific release callback
*/
struct rio_net {
struct list_head node; /* node in list of networks */
struct list_head devices; /* list of devices in this net */
struct list_head switches; /* list of switches in this net */
struct list_head mports; /* list of ports accessing net */
struct rio_mport *hport; /* primary port for accessing net */
unsigned char id; /* RIO network ID */
struct device dev;
void *enum_data; /* private data for enumerator of the network */
void (*release)(struct rio_net *net);
};
enum rio_link_speed {
RIO_LINK_DOWN = 0, /* SRIO Link not initialized */
RIO_LINK_125 = 1, /* 1.25 GBaud */
RIO_LINK_250 = 2, /* 2.5 GBaud */
RIO_LINK_312 = 3, /* 3.125 GBaud */
RIO_LINK_500 = 4, /* 5.0 GBaud */
RIO_LINK_625 = 5 /* 6.25 GBaud */
};
enum rio_link_width {
RIO_LINK_1X = 0,
RIO_LINK_1XR = 1,
RIO_LINK_2X = 3,
RIO_LINK_4X = 2,
RIO_LINK_8X = 4,
RIO_LINK_16X = 5
};
enum rio_mport_flags {
RIO_MPORT_DMA = (1 << 0), /* supports DMA data transfers */
RIO_MPORT_DMA_SG = (1 << 1), /* DMA supports HW SG mode */
RIO_MPORT_IBSG = (1 << 2), /* inbound mapping supports SG */
};
/**
* struct rio_mport_attr - RIO mport device attributes
* @flags: mport device capability flags
* @link_speed: SRIO link speed value (as defined by RapidIO specification)
* @link_width: SRIO link width value (as defined by RapidIO specification)
* @dma_max_sge: number of SG list entries that can be handled by DMA channel(s)
* @dma_max_size: max number of bytes in single DMA transfer (SG entry)
* @dma_align: alignment shift for DMA operations (as for other DMA operations)
*/
struct rio_mport_attr {
int flags;
int link_speed;
int link_width;
/* DMA capability info: valid only if RIO_MPORT_DMA flag is set */
int dma_max_sge;
int dma_max_size;
int dma_align;
};
/* Low-level architecture-dependent routines */
/**
* struct rio_ops - Low-level RIO configuration space operations
* @lcread: Callback to perform local (master port) read of config space.
* @lcwrite: Callback to perform local (master port) write of config space.
* @cread: Callback to perform network read of config space.
* @cwrite: Callback to perform network write of config space.
* @dsend: Callback to send a doorbell message.
* @pwenable: Callback to enable/disable port-write message handling.
* @open_outb_mbox: Callback to initialize outbound mailbox.
* @close_outb_mbox: Callback to shut down outbound mailbox.
* @open_inb_mbox: Callback to initialize inbound mailbox.
* @close_inb_mbox: Callback to shut down inbound mailbox.
* @add_outb_message: Callback to add a message to an outbound mailbox queue.
* @add_inb_buffer: Callback to add a buffer to an inbound mailbox queue.
* @get_inb_message: Callback to get a message from an inbound mailbox queue.
* @map_inb: Callback to map RapidIO address region into local memory space.
* @unmap_inb: Callback to unmap RapidIO address region mapped with map_inb().
* @query_mport: Callback to query mport device attributes.
* @map_outb: Callback to map outbound address region into local memory space.
* @unmap_outb: Callback to unmap outbound RapidIO address region.
*/
struct rio_ops {
int (*lcread) (struct rio_mport *mport, int index, u32 offset, int len,
u32 *data);
int (*lcwrite) (struct rio_mport *mport, int index, u32 offset, int len,
u32 data);
int (*cread) (struct rio_mport *mport, int index, u16 destid,
u8 hopcount, u32 offset, int len, u32 *data);
int (*cwrite) (struct rio_mport *mport, int index, u16 destid,
u8 hopcount, u32 offset, int len, u32 data);
int (*dsend) (struct rio_mport *mport, int index, u16 destid, u16 data);
int (*pwenable) (struct rio_mport *mport, int enable);
int (*open_outb_mbox)(struct rio_mport *mport, void *dev_id,
int mbox, int entries);
void (*close_outb_mbox)(struct rio_mport *mport, int mbox);
int (*open_inb_mbox)(struct rio_mport *mport, void *dev_id,
int mbox, int entries);
void (*close_inb_mbox)(struct rio_mport *mport, int mbox);
int (*add_outb_message)(struct rio_mport *mport, struct rio_dev *rdev,
int mbox, void *buffer, size_t len);
int (*add_inb_buffer)(struct rio_mport *mport, int mbox, void *buf);
void *(*get_inb_message)(struct rio_mport *mport, int mbox);
int (*map_inb)(struct rio_mport *mport, dma_addr_t lstart,
u64 rstart, u64 size, u32 flags);
void (*unmap_inb)(struct rio_mport *mport, dma_addr_t lstart);
int (*query_mport)(struct rio_mport *mport,
struct rio_mport_attr *attr);
int (*map_outb)(struct rio_mport *mport, u16 destid, u64 rstart,
u32 size, u32 flags, dma_addr_t *laddr);
void (*unmap_outb)(struct rio_mport *mport, u16 destid, u64 rstart);
};
#define RIO_RESOURCE_MEM 0x00000100
#define RIO_RESOURCE_DOORBELL 0x00000200
#define RIO_RESOURCE_MAILBOX 0x00000400
#define RIO_RESOURCE_CACHEABLE 0x00010000
#define RIO_RESOURCE_PCI 0x00020000
#define RIO_RESOURCE_BUSY 0x80000000
/**
* struct rio_driver - RIO driver info
* @node: Node in list of drivers
* @name: RIO driver name
* @id_table: RIO device ids to be associated with this driver
* @probe: RIO device inserted
* @remove: RIO device removed
* @shutdown: shutdown notification callback
* @suspend: RIO device suspended
* @resume: RIO device awakened
* @enable_wake: RIO device enable wake event
* @driver: LDM driver struct
*
* Provides info on a RIO device driver for insertion/removal and
* power management purposes.
*/
struct rio_driver {
struct list_head node;
char *name;
const struct rio_device_id *id_table;
int (*probe) (struct rio_dev * dev, const struct rio_device_id * id);
void (*remove) (struct rio_dev * dev);
void (*shutdown)(struct rio_dev *dev);
int (*suspend) (struct rio_dev * dev, u32 state);
int (*resume) (struct rio_dev * dev);
int (*enable_wake) (struct rio_dev * dev, u32 state, int enable);
struct device_driver driver;
};
#define to_rio_driver(drv) container_of(drv,struct rio_driver, driver)
union rio_pw_msg {
struct {
u32 comptag; /* Component Tag CSR */
u32 errdetect; /* Port N Error Detect CSR */
u32 is_port; /* Implementation specific + PortID */
u32 ltlerrdet; /* LTL Error Detect CSR */
u32 padding[12];
} em;
u32 raw[RIO_PW_MSG_SIZE/sizeof(u32)];
};
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
/*
* enum rio_write_type - RIO write transaction types used in DMA transfers
*
* Note: RapidIO specification defines write (NWRITE) and
* write-with-response (NWRITE_R) data transfer operations.
* Existing DMA controllers that service RapidIO may use one of these operations
* for entire data transfer or their combination with only the last data packet
* requires response.
*/
enum rio_write_type {
RDW_DEFAULT, /* default method used by DMA driver */
RDW_ALL_NWRITE, /* all packets use NWRITE */
RDW_ALL_NWRITE_R, /* all packets use NWRITE_R */
RDW_LAST_NWRITE_R, /* last packet uses NWRITE_R, others - NWRITE */
};
struct rio_dma_ext {
u16 destid;
u64 rio_addr; /* low 64-bits of 66-bit RapidIO address */
u8 rio_addr_u; /* upper 2-bits of 66-bit RapidIO address */
enum rio_write_type wr_type; /* preferred RIO write operation type */
};
struct rio_dma_data {
/* Local data (as scatterlist) */
struct scatterlist *sg; /* I/O scatter list */
unsigned int sg_len; /* size of scatter list */
/* Remote device address (flat buffer) */
u64 rio_addr; /* low 64-bits of 66-bit RapidIO address */
u8 rio_addr_u; /* upper 2-bits of 66-bit RapidIO address */
enum rio_write_type wr_type; /* preferred RIO write operation type */
};
static inline struct rio_mport *dma_to_mport(struct dma_device *ddev)
{
return container_of(ddev, struct rio_mport, dma);
}
#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
/**
* struct rio_scan - RIO enumeration and discovery operations
* @owner: The module owner of this structure
* @enumerate: Callback to perform RapidIO fabric enumeration.
* @discover: Callback to perform RapidIO fabric discovery.
*/
struct rio_scan {
struct module *owner;
int (*enumerate)(struct rio_mport *mport, u32 flags);
int (*discover)(struct rio_mport *mport, u32 flags);
};
/**
* struct rio_scan_node - list node to register RapidIO enumeration and
* discovery methods with RapidIO core.
* @mport_id: ID of an mport (net) serviced by this enumerator
* @node: node in global list of registered enumerators
* @ops: RIO enumeration and discovery operations
*/
struct rio_scan_node {
int mport_id;
struct list_head node;
struct rio_scan *ops;
};
/* Architecture and hardware-specific functions */
extern int rio_mport_initialize(struct rio_mport *);
extern int rio_register_mport(struct rio_mport *);
extern int rio_unregister_mport(struct rio_mport *);
extern int rio_open_inb_mbox(struct rio_mport *, void *, int, int);
extern void rio_close_inb_mbox(struct rio_mport *, int);
extern int rio_open_outb_mbox(struct rio_mport *, void *, int, int);
extern void rio_close_outb_mbox(struct rio_mport *, int);
extern int rio_query_mport(struct rio_mport *port,
struct rio_mport_attr *mport_attr);
#endif /* LINUX_RIO_H */