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* Freescale Management Complex (MC) bus public interface
* Copyright (C) 2014-2016 Freescale Semiconductor, Inc.
* Author: German Rivera <>
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
#ifndef _FSL_MC_H_
#define _FSL_MC_H_
#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <linux/interrupt.h>
struct irq_domain;
struct msi_domain_info;
struct fsl_mc_device;
struct fsl_mc_io;
* struct fsl_mc_driver - MC object device driver object
* @driver: Generic device driver
* @match_id_table: table of supported device matching Ids
* @probe: Function called when a device is added
* @remove: Function called when a device is removed
* @shutdown: Function called at shutdown time to quiesce the device
* @suspend: Function called when a device is stopped
* @resume: Function called when a device is resumed
* Generic DPAA device driver object for device drivers that are registered
* with a DPRC bus. This structure is to be embedded in each device-specific
* driver structure.
struct fsl_mc_driver {
struct device_driver driver;
const struct fsl_mc_device_id *match_id_table;
int (*probe)(struct fsl_mc_device *dev);
int (*remove)(struct fsl_mc_device *dev);
void (*shutdown)(struct fsl_mc_device *dev);
int (*suspend)(struct fsl_mc_device *dev, pm_message_t state);
int (*resume)(struct fsl_mc_device *dev);
#define to_fsl_mc_driver(_drv) \
container_of(_drv, struct fsl_mc_driver, driver)
* enum fsl_mc_pool_type - Types of allocatable MC bus resources
* Entries in these enum are used as indices in the array of resource
* pools of an fsl_mc_bus object.
enum fsl_mc_pool_type {
FSL_MC_POOL_DPMCP = 0x0, /* corresponds to "dpmcp" in the MC */
FSL_MC_POOL_DPBP, /* corresponds to "dpbp" in the MC */
FSL_MC_POOL_DPCON, /* corresponds to "dpcon" in the MC */
* NOTE: New resource pool types must be added before this entry
* struct fsl_mc_resource - MC generic resource
* @type: type of resource
* @id: unique MC resource Id within the resources of the same type
* @data: pointer to resource-specific data if the resource is currently
* allocated, or NULL if the resource is not currently allocated.
* @parent_pool: pointer to the parent resource pool from which this
* resource is allocated from.
* @node: Node in the free list of the corresponding resource pool
* NOTE: This structure is to be embedded as a field of specific
* MC resource structures.
struct fsl_mc_resource {
enum fsl_mc_pool_type type;
s32 id;
void *data;
struct fsl_mc_resource_pool *parent_pool;
struct list_head node;
* struct fsl_mc_device_irq - MC object device message-based interrupt
* @msi_desc: pointer to MSI descriptor allocated by fsl_mc_msi_alloc_descs()
* @mc_dev: MC object device that owns this interrupt
* @dev_irq_index: device-relative IRQ index
* @resource: MC generic resource associated with the interrupt
struct fsl_mc_device_irq {
struct msi_desc *msi_desc;
struct fsl_mc_device *mc_dev;
u8 dev_irq_index;
struct fsl_mc_resource resource;
#define to_fsl_mc_irq(_mc_resource) \
container_of(_mc_resource, struct fsl_mc_device_irq, resource)
/* Opened state - Indicates that an object is open by at least one owner */
#define FSL_MC_OBJ_STATE_OPEN 0x00000001
/* Plugged state - Indicates that the object is plugged */
#define FSL_MC_OBJ_STATE_PLUGGED 0x00000002
* Shareability flag - Object flag indicating no memory shareability.
* the object generates memory accesses that are non coherent with other
* masters;
* user is responsible for proper memory handling through IOMMU configuration.
* struct fsl_mc_obj_desc - Object descriptor
* @type: Type of object: NULL terminated string
* @id: ID of logical object resource
* @vendor: Object vendor identifier
* @ver_major: Major version number
* @ver_minor: Minor version number
* @irq_count: Number of interrupts supported by the object
* @region_count: Number of mappable regions supported by the object
* @state: Object state: combination of FSL_MC_OBJ_STATE_ states
* @label: Object label: NULL terminated string
* @flags: Object's flags
struct fsl_mc_obj_desc {
char type[16];
int id;
u16 vendor;
u16 ver_major;
u16 ver_minor;
u8 irq_count;
u8 region_count;
u32 state;
char label[16];
u16 flags;
* Bit masks for a MC object device (struct fsl_mc_device) flags
#define FSL_MC_IS_DPRC 0x0001
* struct fsl_mc_device - MC object device object
* @dev: Linux driver model device object
* @dma_mask: Default DMA mask
* @flags: MC object device flags
* @icid: Isolation context ID for the device
* @mc_handle: MC handle for the corresponding MC object opened
* @mc_io: Pointer to MC IO object assigned to this device or
* NULL if none.
* @obj_desc: MC description of the DPAA device
* @regions: pointer to array of MMIO region entries
* @irqs: pointer to array of pointers to interrupts allocated to this device
* @resource: generic resource associated with this MC object device, if any.
* Generic device object for MC object devices that are "attached" to a
* MC bus.
* - For a non-DPRC object its icid is the same as its parent DPRC's icid.
* - The SMMU notifier callback gets invoked after device_add() has been
* called for an MC object device, but before the device-specific probe
* callback gets called.
* - DP_OBJ_DPRC objects are the only MC objects that have built-in MC
* portals. For all other MC objects, their device drivers are responsible for
* allocating MC portals for them by calling fsl_mc_portal_allocate().
* - Some types of MC objects (e.g., DP_OBJ_DPBP, DP_OBJ_DPCON) are
* treated as resources that can be allocated/deallocated from the
* corresponding resource pool in the object's parent DPRC, using the
* fsl_mc_object_allocate()/fsl_mc_object_free() functions. These MC objects
* are known as "allocatable" objects. For them, the corresponding
* fsl_mc_device's 'resource' points to the associated resource object.
* For MC objects that are not allocatable (e.g., DP_OBJ_DPRC, DP_OBJ_DPNI),
* 'resource' is NULL.
struct fsl_mc_device {
struct device dev;
u64 dma_mask;
u16 flags;
u16 icid;
u16 mc_handle;
struct fsl_mc_io *mc_io;
struct fsl_mc_obj_desc obj_desc;
struct resource *regions;
struct fsl_mc_device_irq **irqs;
struct fsl_mc_resource *resource;
#define to_fsl_mc_device(_dev) \
container_of(_dev, struct fsl_mc_device, dev)
struct mc_cmd_header {
u8 src_id;
u8 flags_hw;
u8 status;
u8 flags_sw;
__le16 token;
__le16 cmd_id;
struct mc_command {
u64 header;
u64 params[MC_CMD_NUM_OF_PARAMS];
enum mc_cmd_status {
MC_CMD_STATUS_OK = 0x0, /* Completed successfully */
MC_CMD_STATUS_READY = 0x1, /* Ready to be processed */
MC_CMD_STATUS_AUTH_ERR = 0x3, /* Authentication error */
MC_CMD_STATUS_NO_PRIVILEGE = 0x4, /* No privilege */
MC_CMD_STATUS_DMA_ERR = 0x5, /* DMA or I/O error */
MC_CMD_STATUS_CONFIG_ERR = 0x6, /* Configuration error */
MC_CMD_STATUS_TIMEOUT = 0x7, /* Operation timed out */
MC_CMD_STATUS_NO_RESOURCE = 0x8, /* No resources */
MC_CMD_STATUS_NO_MEMORY = 0x9, /* No memory available */
MC_CMD_STATUS_BUSY = 0xA, /* Device is busy */
MC_CMD_STATUS_UNSUPPORTED_OP = 0xB, /* Unsupported operation */
MC_CMD_STATUS_INVALID_STATE = 0xC /* Invalid state */
* MC command flags
/* High priority flag */
#define MC_CMD_FLAG_PRI 0x80
/* Command completion flag */
#define MC_CMD_FLAG_INTR_DIS 0x01
static inline u64 mc_encode_cmd_header(u16 cmd_id,
u32 cmd_flags,
u16 token)
u64 header = 0;
struct mc_cmd_header *hdr = (struct mc_cmd_header *)&header;
hdr->cmd_id = cpu_to_le16(cmd_id);
hdr->token = cpu_to_le16(token);
hdr->status = MC_CMD_STATUS_READY;
if (cmd_flags & MC_CMD_FLAG_PRI)
hdr->flags_hw = MC_CMD_FLAG_PRI;
if (cmd_flags & MC_CMD_FLAG_INTR_DIS)
hdr->flags_sw = MC_CMD_FLAG_INTR_DIS;
return header;
static inline u16 mc_cmd_hdr_read_token(struct mc_command *cmd)
struct mc_cmd_header *hdr = (struct mc_cmd_header *)&cmd->header;
u16 token = le16_to_cpu(hdr->token);
return token;
struct mc_rsp_create {
__le32 object_id;
struct mc_rsp_api_ver {
__le16 major_ver;
__le16 minor_ver;
static inline u32 mc_cmd_read_object_id(struct mc_command *cmd)
struct mc_rsp_create *rsp_params;
rsp_params = (struct mc_rsp_create *)cmd->params;
return le32_to_cpu(rsp_params->object_id);
static inline void mc_cmd_read_api_version(struct mc_command *cmd,
u16 *major_ver,
u16 *minor_ver)
struct mc_rsp_api_ver *rsp_params;
rsp_params = (struct mc_rsp_api_ver *)cmd->params;
*major_ver = le16_to_cpu(rsp_params->major_ver);
*minor_ver = le16_to_cpu(rsp_params->minor_ver);
* Bit masks for a MC I/O object (struct fsl_mc_io) flags
* struct fsl_mc_io - MC I/O object to be passed-in to mc_send_command()
* @dev: device associated with this Mc I/O object
* @flags: flags for mc_send_command()
* @portal_size: MC command portal size in bytes
* @portal_phys_addr: MC command portal physical address
* @portal_virt_addr: MC command portal virtual address
* @dpmcp_dev: pointer to the DPMCP device associated with the MC portal.
* Fields are only meaningful if the FSL_MC_IO_ATOMIC_CONTEXT_PORTAL flag is not
* set:
* @mutex: Mutex to serialize mc_send_command() calls that use the same MC
* portal, if the fsl_mc_io object was created with the
* FSL_MC_IO_ATOMIC_CONTEXT_PORTAL flag off. mc_send_command() calls for this
* fsl_mc_io object must be made only from non-atomic context.
* Fields are only meaningful if the FSL_MC_IO_ATOMIC_CONTEXT_PORTAL flag is
* set:
* @spinlock: Spinlock to serialize mc_send_command() calls that use the same MC
* portal, if the fsl_mc_io object was created with the
* FSL_MC_IO_ATOMIC_CONTEXT_PORTAL flag on. mc_send_command() calls for this
* fsl_mc_io object can be made from atomic or non-atomic context.
struct fsl_mc_io {
struct device *dev;
u16 flags;
u16 portal_size;
phys_addr_t portal_phys_addr;
void __iomem *portal_virt_addr;
struct fsl_mc_device *dpmcp_dev;
union {
* This field is only meaningful if the
struct mutex mutex; /* serializes mc_send_command() */
* This field is only meaningful if the
spinlock_t spinlock; /* serializes mc_send_command() */
int mc_send_command(struct fsl_mc_io *mc_io, struct mc_command *cmd);
#define dev_is_fsl_mc(_dev) ((_dev)->bus == &fsl_mc_bus_type)
/* If fsl-mc bus is not present device cannot belong to fsl-mc bus */
#define dev_is_fsl_mc(_dev) (0)
* module_fsl_mc_driver() - Helper macro for drivers that don't do
* anything special in module init/exit. This eliminates a lot of
* boilerplate. Each module may only use this macro once, and
* calling it replaces module_init() and module_exit()
#define module_fsl_mc_driver(__fsl_mc_driver) \
module_driver(__fsl_mc_driver, fsl_mc_driver_register, \
* Macro to avoid include chaining to get THIS_MODULE
#define fsl_mc_driver_register(drv) \
__fsl_mc_driver_register(drv, THIS_MODULE)
int __must_check __fsl_mc_driver_register(struct fsl_mc_driver *fsl_mc_driver,
struct module *owner);
void fsl_mc_driver_unregister(struct fsl_mc_driver *driver);
int __must_check fsl_mc_portal_allocate(struct fsl_mc_device *mc_dev,
u16 mc_io_flags,
struct fsl_mc_io **new_mc_io);
void fsl_mc_portal_free(struct fsl_mc_io *mc_io);
int fsl_mc_portal_reset(struct fsl_mc_io *mc_io);
int __must_check fsl_mc_object_allocate(struct fsl_mc_device *mc_dev,
enum fsl_mc_pool_type pool_type,
struct fsl_mc_device **new_mc_adev);
void fsl_mc_object_free(struct fsl_mc_device *mc_adev);
struct irq_domain *fsl_mc_msi_create_irq_domain(struct fwnode_handle *fwnode,
struct msi_domain_info *info,
struct irq_domain *parent);
int __must_check fsl_mc_allocate_irqs(struct fsl_mc_device *mc_dev);
void fsl_mc_free_irqs(struct fsl_mc_device *mc_dev);
extern struct bus_type fsl_mc_bus_type;
#endif /* _FSL_MC_H_ */